High-reliability horizontal chemical axial flow pump structure

Abstract

The utility model relates to a high-reliability horizontal chemical axial flow pump structure which comprises an impeller, a pump body, a shaft, a shaft sleeve, a throttling sleeve, a bearing body, a bidirectional bearing, a guide vane body, a front mechanical seal assembly, a front mechanical seal flushing pipe, a radial bearing, a shaft protecting sleeve, a medium isolation flushing pipe and the like. The guide vane body is mounted at an inlet of the pump body, flanges are arranged at two ends of the guide vane body, one end of a guide vane of the guide vane body is connected with an outer shell of the guide vane body, and the other end is fixed on the guide vane hub; a front mechanical seal assembly is installed in the guide vane hub, a front mechanical seal flushing pipe penetrates to the guide vane hub from the outer shell in the direction of the guide vanes, during flushing, flushing fluid is introduced into the front mechanical seal flushing pipe from the outside, and a radial bearing is arranged in the guide vane hub; the medium isolation flushing pipe penetrates from the outer shell to the guide vane hub along the guide vane blades. The pump structure is low in rotor deflection, low in vibration and noise and high in operation stability; the lengths of the shaft and the bearing body are reduced, the operation stability is improved, and the material cost is reduced; pump body abrasion is eliminated, and the service life of the pump is prolonged.

Description

Technical Field

[0001] The utility model relates to a horizontal chemical axial flow pump structure, in particular to a high-reliability horizontal chemical axial flow pump structure with low rotor deflection, low pump noise, high stability and long pump life. Background Art

[0002] Horizontal chemical axial flow pumps generally have the performance characteristics of low head and large flow, and are often used in various chemical products such as salt and alkali manufacturing process systems, playing the role of forced circulation of the medium in the system. The stability of this pump determines whether the entire process system can operate stably for a long time, so the structural reliability of this pump is particularly important; secondly, the energy consumption of the pump accounts for a large proportion of the total energy consumption of the system, and the efficiency of the pump is also the key to the economy of the system.

[0003] Figure 1 It is a common structure of horizontal chemical axial flow pumps, mainly including: impeller nut 1, impeller 2, pump body 3, shaft 4, sleeve 5, throttling sleeve 6, mechanical seal 7, radial bearing 8, bearing body 9, bidirectional bearing 10. The impeller of this structure pumps the medium from the end and discharges it from the top. The pump is a part of the system pipeline to force the medium to circulate. Both pairs of bearings are outside the pump housing, and the impeller is at the end of the rotor cantilever.

[0004] from Figure 1 It can be seen that this structure has the following disadvantages:

[0005] 1. The impeller 2 is far away from the radial bearing 8, and the rotor has a long cantilever length. The deflection of the impeller is large during operation, which will accelerate the wear of the gap between the impeller and the pump body, shorten the life of the parts, and increase the vibration and noise during operation;

[0006] 2. The longer the cantilever length is, the greater the distance between the radial bearing 8 and the bidirectional bearing 10 is required to reduce the deflection at the impeller, which leads to the increase of the axial dimensions of the shaft 4 and the bearing body 9, greatly increasing the axial dimensions of the pump.

[0007] 3. There is no guide vane behind impeller 2, which cannot eliminate the circumferential velocity circulation behind the impeller, resulting in low hydraulic efficiency of the pump and increased operating costs.

[0008] 4. When conveying a medium with a high particle content, the particles enter the gap between the shaft sleeve 5 and the throttling sleeve 6, causing the two parts to wear faster. The particles pass through the gap and flow to the friction pair of the mechanical seal 7, reducing the service life of the mechanical seal.

[0009] 5. When conveying high-temperature media, the media has high requirements for the high-temperature resistance of the mechanical seal 7, the cost of the mechanical seal is high, and the manufacturing cost of the pump increases. Utility Model Content

[0010] In view of the above problems, the main purpose of the utility model is to provide a highly reliable horizontal chemical axial flow pump structure with low rotor deflection, low noise, high stability and long pump life.

[0011] The utility model solves the above technical problems through the following technical solutions: a high-reliability horizontal chemical axial flow pump structure, the high-reliability horizontal chemical axial flow pump structure, the structure includes: an impeller nut, an impeller, a pump body, a shaft, a sleeve, a throttling sleeve, a mechanical seal, a bearing body, and a bidirectional bearing. The high-reliability horizontal chemical axial flow pump structure also includes: a guide vane body, a front mechanical seal assembly, a front mechanical seal flushing pipe, a radial bearing, and a medium isolation flushing pipe.

[0012] The guide vane body is a pipe-shaped guide vane body; the guide vane body is installed at the inlet of the pump body, flanges are provided at both ends of the guide vane body, one end of the guide vane of the guide vane body is connected to the outer shell of the guide vane body, and the other end is fixed to the guide vane hub; a front mechanical seal assembly is installed in the guide vane hub.

[0013] The front mechanical seal flushing pipe runs from the outer shell along the radial direction of the blades to the guide vane hub. During flushing, flushing liquid is introduced into the front mechanical seal flushing pipe from the outside.

[0014] The radial bearing is arranged in the guide vane hub; the medium isolation flushing pipe penetrates from the outer shell along the radial direction of the blade to the guide vane hub.

[0015] In a specific implementation example of the utility model, the high-reliability horizontal chemical axial flow pump structure also includes a guide vane body wear-resistant ring, and the guide vane body wear-resistant ring is installed at the guide vane body inlet.

[0016] In a specific implementation example of the present utility model, a flange at one end of the guide vane body is connected to a bend pipe at the pump body inlet, and a flange at the other end is connected to a pipeline.

[0017] In a specific implementation example of the utility model, a hole is opened at the large bend of the pump body to weld a shaft protection sleeve.

[0018] In a specific implementation example of the utility model, an annular gap is formed between the shaft protection sleeve and the shaft.

[0019] In a specific implementation example of the utility model, a rear cooling cavity is formed between the shaft protection sleeve and the inner wall of the rear sealing cavity, and the end is sealed with a cooling cavity sealing plate; and a rear cooling pipe is connected to the rear cooling cavity.

[0020] The positive progress of the utility model is that the high-reliability horizontal chemical axial flow pump structure provided by the utility model has the following advantages compared with the common technology:

[0021] 1. The rotor deflection is greatly reduced, the vibration and noise are reduced, and the operating stability is improved;

[0022] 2. The length of the shaft and bearing body components is reduced, which improves the running stability and reduces the material cost;

[0023] 3. The wear of the pump body is eliminated. The wear of the pump body is replaced by the guide vane wear ring, which increases the life of the pump;

[0024] 4. It can pump medium containing particles and the mechanical seal is not easily damaged, which increases the life of the pump;

[0025] 5. It can pump high temperature media and the mechanical seal is not easily damaged, which increases the life of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the currently common structure.

[0027] Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0028] Figure 3 This is a schematic diagram of the improved pump body assembly of the utility model.

[0029] Figure 4 A schematic diagram of the guide vane structure in the utility model.

[0030] Figure 5 It is a schematic diagram of the flow of flushing liquid in the utility model.

[0031] Figure 6 It is a schematic diagram of the improved bearing component in the utility model.

[0032] The following are the names corresponding to the label numbers in this utility model:

[0033] Impeller nut 1, impeller 2, pump body 3, shaft 4, sleeve 5, throttling sleeve 6, mechanical seal 7, radial bearing 8, bearing body 9, bidirectional bearing 10, guide vane body wear ring 11, guide vane body 12, front mechanical seal assembly 13, front mechanical seal flushing pipe 14, front radial bearing 15, shaft sleeve pipe 16, medium isolation flushing pipe 17, rear cooling pipe 18, cooling chamber sealing plate 19, cooling chamber 20, flange 121, guide vane 122, outer shell 123, guide vane hub 124. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solution of the present invention in detail.

[0035] Figure 2 It is a schematic diagram of the overall structure of the utility model. Figure 3 This is a schematic diagram of the improved pump assembly of the utility model, as shown in Figure 2-3As shown: the utility model proposes a high-reliability horizontal chemical axial flow pump structure, which includes an impeller nut 1, an impeller 2, a pump body 3, a shaft 4, a sleeve 5, a throttling sleeve 6, a mechanical seal 7, a bearing body 9, a bidirectional bearing 10, a guide vane body 12, a front mechanical seal assembly 13, a front mechanical seal flushing pipe 14, a radial bearing 15, a shaft protection sleeve 16, a medium isolation flushing pipe 17, and a rear cooling pipe 18.

[0036] The guide vane body 12 is a pipe-shaped guide vane body, which is installed at the pump inlet. Flanges 121 are provided at both ends of the guide vane body 12. One end of the guide vane 122 of the guide vane body 12 is connected to the outer shell 123 of the guide vane body 12, and the other end is fixed to the guide vane hub 124. The front mechanical seal assembly 13 is installed in the guide vane hub 124. Figure 4 .

[0037] The front machine seal flushing pipe 14 passes through the outer shell 123 along the blade direction to the guide vane hub 124. During flushing, flushing liquid is introduced from the outside into the front machine seal flushing pipe 14. The external flushing liquid is introduced to flush the machine seal friction pair and lubricate the front radial bearing 15. The flushing liquid flows axially from the annular gap between the shaft protective sleeve 16 and the shaft into the rear machine seal cavity.

[0038] The utility model is at the large bend of the pump body ( Figure 3 A hole is opened and welded to the shaft protection sleeve; a rear cooling cavity is formed between the shaft protection sleeve and the inner wall of the rear sealing cavity, and the end is blocked with a cooling cavity sealing plate 19; the shaft protection sleeve 16 is connected to the shaft 4 (see Figure 1 ) is provided with an annular gap, and a rear cooling pipe 18 is connected to the rear cooling cavity.

[0039] The utility model removes the part between the pump inlet and the beginning of the turn in the original structure, retains the turn part, and adds a flange at the pump inlet. The shaft protection sleeve is welded at the large bend of the pump body. A cooling cavity is formed between the shaft protection sleeve and the inner wall of the rear sealing cavity, and the end is blocked with a cooling cavity sealing plate 19. For details, see Figure 3 .

[0040] The utility model adds a guide vane body, which is in the shape of a pipe. Flanges are provided at both ends of the guide vane outer shell, one end is connected to the pump body elbow, and the other end is connected to the pipeline. The guide vane connects the outer shell and the guide vane hub. The front machine seal assembly 13 is installed in the guide vane hub. The guide vane structure is shown in FIG. Figure 4 (Structural diagram of the guide vane body). The front machine seal flushing pipe 14 runs from the outer shell along the blades to the guide vane hub, and is used to introduce external flushing liquid to flush the machine seal friction pair and lubricate the front radial bearing 15. The flushing liquid flows axially from the annular gap between the shaft protection sleeve 16 and the shaft 4 into the rear machine seal cavity. This process protects the shaft, and after flushing and cooling the rear machine seal friction pair, it flows out of the rear machine seal cavity. This flow process is shown in Figure 5(Schematic diagram of flushing liquid flow). The medium isolation flushing pipe 17 runs from the outer shell along the blades to the guide vane hub, which is used to introduce clean medium without particles. The medium flows out along the gap between the mechanical seal static ring seat and the mechanical seal shaft sleeve, and then flows out through the gap between the impeller hub and the guide vane hub to the guide vane body flow channel to mix with the conveying medium. This flow prevents particles in the pumped medium from entering the front mechanical seal friction pair. This flow process is shown in Figure 5 (Schematic diagram of flushing liquid flow) The guide vane wear ring 11 is installed at the inlet of the guide vane 12 to prevent the guide vane 12 from being worn. As a wearing part, it is easy to replace and reduce maintenance costs.

[0041] The utility model removes Figure 1 The middle radial bearing 8 shortens the axial length of the rear bearing body. The modified bearing components are as follows Figure 6 (Schematic diagram of the improved bearing components).

[0042] The rotor deflection of the utility model is greatly reduced, vibration and noise are reduced, and operational stability is improved. The length of the shaft and bearing body components of the utility model is reduced, operational stability is improved, and material costs are reduced. The utility model eliminates pump body wear, and the wear of the pump body is replaced by the guide vane wear ring, which increases the life of the pump. The utility model can pump medium containing particulate matter and the mechanical seal is not easily damaged, which increases the life of the pump. The utility model can pump medium with higher temperature and the mechanical seal is not easily damaged, which increases the life of the pump.

[0043] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A high-reliability horizontal chemical axial flow pump structure, the high-reliability horizontal chemical axial flow pump structure, the structure comprising: An impeller nut (1), an impeller (2), a pump body (3), a shaft (4), a sleeve (5), a throttle sleeve (6), a mechanical seal (7), a bearing body (9), and a bidirectional bearing (10), characterized in that the high-reliability horizontal chemical axial flow pump structure also includes: a guide vane body (12), a front mechanical seal assembly (13), a front mechanical seal flushing pipe (14), a radial bearing (15), and a medium isolation flushing pipe (17); The guide vane body (12) is a pipe-shaped guide vane body; the guide vane body (12) is installed at the inlet of the pump body, flanges (121) are provided at both ends of the guide vane body (12), one end of the guide vane (122) of the guide vane body (12) is connected to the outer shell (123) of the guide vane body (12), and the other end is fixed to the guide vane hub (124); the front mechanical seal assembly (13) is installed in the guide vane hub (124), The front mechanical seal flushing pipe (14) penetrates from the outer shell (123) along the radial direction of the blades to the guide vane hub (124). During flushing, flushing liquid is introduced from the outside into the front mechanical seal flushing pipe (14). The radial bearing (15) is arranged in the guide vane hub (124); and the medium isolation flushing pipe (17) penetrates from the outer shell along the radial direction of the blades to the guide vane hub (124).

2. The high-reliability horizontal chemical axial flow pump structure according to claim 1 is characterized in that: The highly reliable horizontal chemical axial flow pump structure also includes a guide vane body wear-resistant ring (11), which is installed at the inlet of the guide vane body (12).

3. The high-reliability horizontal chemical axial flow pump structure according to claim 1 is characterized in that: The flange (121) at one end of the guide vane body (12) is connected to the elbow pipe at the pump body inlet, and the flange at the other end is connected to the pipeline.

4. The high-reliability horizontal chemical axial flow pump structure according to claim 1 is characterized in that: A hole is opened at the large bend of the pump body to weld a shaft protection sleeve (16).

5. The high-reliability horizontal chemical axial flow pump structure according to claim 4 is characterized in that: An annular gap is formed between the shaft protection sleeve (16) and the shaft (4).

6. The high-reliability horizontal chemical axial flow pump structure according to claim 4 or 5 is characterized in that: A rear cooling cavity is formed between the shaft protection sleeve and the inner wall of the rear sealing cavity, and the end is sealed with a cooling cavity sealing plate (19); and a rear cooling pipe (18) is connected to the rear cooling cavity.

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