Novel balance disc multi-stage pump body

Abstract

The utility model discloses a novel balance disc multistage pump body which comprises a main shaft and a pump body outer shell body, the pump body outer shell body is arranged outside the main shaft, a final-stage impeller, a novel balance disc and a tail cover are sequentially installed outside the main shaft in the axial direction, the final-stage impeller and the novel balance disc are arranged between the main shaft and the pump body outer shell body, and the tail cover is arranged on the main shaft. The tail cover is installed on one side of the pump body outer shell, a guide vane chamber is formed in the side, away from the tail cover, of the pump body outer shell, a middle section shell installation straight opening is formed in the outer portion of the side, away from the tail cover, of the pump body outer shell, a pump body flow channel outlet is formed in the outer portion of the pump body outer shell, and a pump body water outlet flange is installed at the end of the pump body flow channel outlet. A pull rod cover is installed outside the pump body outer shell, and a shaft seal chamber is arranged between the tail cover and the main shaft. The structure of the pump body is redesigned, a last-stage guide vane in a traditional multi-stage pump is omitted, the last-stage impeller is directly installed on the pump body, the structure is simplified, and manufacturing cost and maintenance complexity are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-stage pumps, in particular to a novel balancing disc multi-stage pump body. Background Art

[0002] As a key equipment in the industrial field, multi-stage centrifugal pumps are widely used in various fluid transportation scenarios. Its working principle is to gradually pressurize the fluid under the action of centrifugal force through the impellers connected in series step by step, and finally a final pump body collects the high-pressure fluid output by the previous impeller, and then transports the fluid to the pipeline. With the increase in the number of pump stages, the increase in axial force becomes a significant problem, and the direction of the axial force points to the impeller inlet end. To solve this problem, a balance chamber is set on the outside of the last stage pump body of the multi-stage pump. A balance disc mechanism is installed in the balance chamber to balance the axial force so that the pump can operate normally. The existing multi-stage pump body with a balance disc structure has the following shortcomings:

[0003] 1. The pump body flow channel design adopts an annular flow channel, which results in large hydraulic loss and low pump efficiency;

[0004] 2. Due to the shape of the flow channel, the last-stage impeller must be paired with a last-stage guide vane to guide the fluid output by the impeller into the annular flow channel, resulting in a complex structure, high manufacturing cost, and complex maintenance;

[0005] 3. Limited by the pump body structure, the volume of the balance chamber is large, which increases the axial dimension of the pump body. Utility Model Content

[0006] The utility model aims to provide a novel balancing disc multi-stage pump body, comprising a main shaft and a pump body outer casing, wherein the pump body outer casing is arranged outside the main shaft, and a final stage impeller, a novel balancing disc and a tail cover are sequentially installed on the outside of the main shaft along the axial direction, the final stage impeller and the novel balancing disc are arranged between the main shaft and the pump body outer casing, the tail cover is installed on one side of the pump body outer casing, a guide vane chamber is provided on the side of the pump body outer casing away from the tail cover, a middle section casing installation straight port is provided on the outside of the pump body outer casing away from the tail cover, a pump body flow channel outlet is provided on the outside of the pump body outer casing, a pump body water outlet flange is installed at the end of the pump body flow channel outlet, a pull rod cover is installed on the outside of the pump body outer casing, and a shaft sealing chamber is provided between the tail cover and the main shaft.

[0007] As a further preference, a balancing chamber and an impeller chamber are provided on one side of the outer casing of the pump body adjacent to the main shaft, the last-stage impeller is installed inside the impeller chamber, and the new balancing disc is installed inside the balancing chamber.

[0008] As a further preference, a sealing ring is installed outside the last-stage impeller, and an impeller chamber baffle is installed between the sealing ring and the outer casing of the pump body.

[0009] As a further preference, a balancing sleeve is installed outside the novel balancing disc, and the balancing sleeve is arranged between the novel balancing disc and the outer shell of the pump body. A balancing ring is arranged outside the balancing sleeve, and the balancing ring is arranged inside the balancing chamber.

[0010] As a further preference, the pump body flow channel outlet is connected to the inner cavity of the guide vane chamber through a spiral flow channel.

[0011] Through the above technical solution, the beneficial effects of the utility model are:

[0012] The streamlined spiral volute flow channel design of this utility model:

[0013] 1. Through CFD flow field analysis, the pump flow channel is optimized, and the spiral volute flow channel design is adopted to improve the uniformity and efficiency of fluid flow, reduce energy loss, and thus improve the hydraulic efficiency of the water pump.

[0014] 2. Simplified structure: By redesigning the pump body structure, the last-stage guide vanes in the traditional multi-stage pump are eliminated, and the last-stage impeller is directly installed on the pump body, which simplifies the structure and reduces manufacturing costs and maintenance complexity.

[0015] 3. Compact balance chamber: By optimizing the shape and size of the balance chamber, the axial size of the pump body is reduced, the overall compactness is improved, and the main shaft of the water pump is more rigid.

[0016] 4. Improved appearance: Combining industrial design and aesthetic principles, the appearance design of the pump body is optimized to meet functional requirements and have the aesthetics of modern industrial equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the pump body of the new type of balancing disc multi-stage pump of the utility model;

[0018] Figure 2 This is a schematic diagram of the pump body structure of the new type of balancing disc multi-stage pump of the utility model;

[0019] Figure 3 It is a structural schematic diagram of one side of the pump body of the new type of balancing disc multi-stage pump of the utility model.

[0020] In the figure: 1 main shaft, 2 last stage impeller, 3 impeller chamber baffle, 4 guide vane chamber, 5 pump body flow channel outlet, 6 balance chamber, 7 balance ring, 8 balance sleeve, 9 tail cover, 10 shaft seal chamber, 11 new balance plate, 12 middle section casing installation straight port, 13 impeller chamber, 14 sealing ring, 15 pump body water outlet flange, 16 tie rod cover, 17 pump body outer casing, 18 pump body support foot plate. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-3 As shown, the utility model provides a novel balancing disc multi-stage pump body, including a main shaft 1 and a pump body outer casing 17, the pump body outer casing 17 is arranged outside the main shaft 1, and the last stage impeller 2, the novel balancing disc 11 and the tail cover 9 are sequentially installed on the outside of the main shaft 1 along the axial direction, the last stage impeller 2 and the novel balancing disc 11 are arranged between the main shaft 1 and the pump body outer casing 17, the tail cover 9 is installed on one side of the pump body outer casing 17, a guide vane chamber 4 is opened on the side of the pump body outer casing 17 away from the tail cover 9, a middle section casing installation straight port 12 is arranged on the outside of the pump body outer casing 17 away from the tail cover 9, a pump body flow channel outlet 5 is arranged on the outside of the pump body outer casing 17, a pump body water outlet flange 15 is installed on the end of the pump body flow channel outlet 5, a pull rod cover 16 is installed on the outside of the pump body outer casing 17, and a shaft sealing chamber 10 is arranged between the tail cover 9 and the main shaft 1.

[0023] Furthermore, a balancing chamber 6 and an impeller chamber 13 are opened on one side of the outer casing 17 of the pump body adjacent to the main shaft 1, the last stage impeller 2 is installed inside the impeller chamber 13, the new balancing disk 11 is installed inside the balancing chamber 6, and a pump body supporting foot plate 18 is installed outside the outer casing 17 of the pump body.

[0024] Furthermore, a sealing ring 14 is installed outside the last-stage impeller 2 , and an impeller chamber baffle 3 is installed between the sealing ring 14 and the outer casing 17 of the pump body.

[0025] Furthermore, a balancing sleeve 8 is installed outside the new balancing disc 11 , and the balancing sleeve 8 is arranged between the new balancing disc 11 and the outer casing 17 of the pump body. A balancing ring 7 is arranged outside the balancing sleeve 8 , and the balancing ring 7 is arranged inside the balancing chamber 6 .

[0026] Specifically, the internal structure of the pump body is redesigned, the internal structure of the pump body is simplified, and unnecessary components such as the last-stage guide vanes are eliminated, making the structure more simple and compact.

[0027] In addition, by providing a new type of balancing disc 11, effective balancing of the axial force is achieved, while reducing the volume of the balancing chamber 6.

[0028] like Figure 2 and 3 As shown, the pump body flow channel outlet 5 is connected to the inner cavity of the guide vane chamber 4 through a spiral flow channel. The streamlined flow channel design will significantly reduce energy loss and improve the hydraulic efficiency of the water pump.

[0029] It should be noted that through CFD flow field analysis, the flow channel of the pump body is optimized and designed, and a spiral volute flow channel is adopted to achieve uniformity and high efficiency of fluid flow.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel balanced disc multi-stage pump body, comprising a main shaft (1) and a pump body outer casing (17), characterized in that: The pump body outer casing (17) is arranged outside the main shaft (1), and the main shaft (1) is axially mounted with a final stage impeller (2), a new type of balancing disc (11) and a tail cover (9) in sequence outside the main shaft (1), and the final stage impeller (2) and the new type of balancing disc (11) are arranged between the main shaft (1) and the pump body outer casing (17), and the tail cover (9) is mounted on one side of the pump body outer casing (17), and a guide vane chamber (4) is provided on the side of the pump body outer casing (17) away from the tail cover (9), and a middle section casing mounting straight opening (12) is provided on the side of the pump body outer casing (17) away from the tail cover (9), and a pump body flow channel outlet (5) is provided on the outside of the pump body outer casing (17), and a pump body water outlet flange (15) is installed at the end of the pump body flow channel outlet (5), and a pull rod cover (16) is installed on the outside of the pump body outer casing (17), and a shaft sealing chamber (10) is provided between the tail cover (9) and the main shaft (1).

2. According to claim 1, a novel balancing disc multi-stage pump body is characterized in that: A balancing chamber (6) and an impeller chamber (13) are provided on one side of the pump body outer casing (17) adjacent to the main shaft (1); the final-stage impeller (2) is installed inside the impeller chamber (13); and the novel balancing disc (11) is installed inside the balancing chamber (6).

3. According to claim 2, a novel balancing disc multi-stage pump body is characterized in that: A sealing ring (14) is installed outside the final stage impeller (2), and an impeller chamber baffle (3) is installed between the sealing ring (14) and the pump body outer casing (17).

4. According to claim 2, a novel balancing disc multi-stage pump body is characterized in that: A balancing sleeve (8) is installed outside the novel balancing disc (11), and the balancing sleeve (8) is arranged between the novel balancing disc (11) and the outer casing (17) of the pump body. A balancing ring (7) is arranged outside the balancing sleeve (8), and the balancing ring (7) is arranged inside the balancing chamber (6).

5. According to claim 1, a novel balancing disc multi-stage pump body is characterized in that: The pump body flow channel outlet (5) is connected to the inner cavity of the guide vane chamber (4) through a spiral flow channel.

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