Novel sealing cavity structure for paper pulp pump

Abstract

The utility model relates to a novel sealing cavity structure for a paper pulp pump, a sealing cavity body is composed of an impeller, a pump cover and a shaft, a replacement part is arranged in the sealing cavity, and the replacement part is one of a single-end-face mechanical seal, a double-end-face mechanical seal or a packing seal. The sealing cavity is generally designed according to packing sealing, single-end-face mechanical sealing and double-end-face mechanical sealing, interchange of multiple sealing modes can be achieved, the effect of multiple purposes is achieved, and the production cost is effectively reduced. The shaft sleeve is installed between the impeller hub and the shaft shoulder, after the impeller nut is screwed down when the pump is assembled, the impeller hub and the shaft shoulder jointly press the shaft sleeve, key connection is not needed, and therefore the shaft sleeve can be relatively thinned, the size of a sealing cavity is reduced, and cost is reduced. As key connection is not adopted, a key groove is not formed in the shaft, the strength of the shaft is ensured, and safe operation of a unit is ensured.

Description

Technical Field

[0001] This utility model relates to a sealing cavity structure, specifically a novel sealing cavity structure for pulp pumps that allows for interchangeability of multiple sealing methods, achieving a multi-purpose effect and effectively reducing production costs. Background Technology

[0002] A pulp pump is a device specifically designed for conveying pulp and is widely used in the pulp and paper industry. With the rapid development of industry, the market demand for pulp pumps is increasing. Pulp pumps employ different sealing types under different operating conditions, typically using single-end mechanical seals, double-end mechanical seals, or packing seals to prevent leakage.

[0003] Currently, due to the different sealing types used, each corresponding to a different pump cover sealing cavity, a single pump requires multiple pump covers. This results in high production costs, resource waste, and an inability to standardize and modularize spare parts, leading to inconvenience in the subsequent installation and maintenance of mechanical seal components. Therefore, a universal pump cover sealing cavity structure needs to be designed to simplify disassembly and assembly, save costs, and require only one pump cover per pump, effectively reducing costs and facilitating installation and maintenance. Utility Model Content

[0004] To address the aforementioned problems, the main objective of this utility model is to provide a novel sealing cavity structure for pulp pumps that allows for interchangeability of multiple sealing methods, achieving a multi-functional design and effectively reducing production costs.

[0005] This utility model solves the above-mentioned technical problems through the following technical solution: a novel sealing cavity structure for a pulp pump, wherein the novel sealing cavity for the pulp pump is composed of a space enclosed by an impeller, a pump cover, and a shaft, and a replacement component is provided in the sealing cavity, which is one of the following three types: a single-end mechanical seal, a double-end mechanical seal, or a packing seal.

[0006] In a specific embodiment of this utility model, when a single-end mechanical seal is used, the impeller, pump cover, and shaft remain unchanged. The shaft sleeve is installed in the impeller hub of the impeller and the shaft shoulder. The shaft sleeve is fixed to the shaft by the axial force applied to the impeller by the left impeller nut and the shaft shoulder. The single-end mechanical seal is installed on the right side of the mechanical seal shaft sleeve.

[0007] In a specific embodiment of this utility model, a set screw is used to connect and fix the mechanical seal cover to the pump cover.

[0008] In a specific embodiment of this utility model, when a double-end mechanical seal is used, the impeller, pump cover, and shaft remain unchanged. The replacement part is a double-end mechanical seal, which includes a mechanical seal bushing, a medium-end sealing ring, a mechanical seal gland, and an air-end sealing ring. The mechanical seal bushing, which comes with the double-end mechanical seal, is installed in the impeller hub and the shaft shoulder. The mechanical seal bushing is fixed to the shaft by the axial force applied to the impeller by the left impeller nut and the shaft shoulder. Then, two sealing rings are used for radial and axial sealing. The medium-end sealing ring is clamped on the mechanical seal bushing, and the air-end sealing ring is installed on the shaft and fixed by an anti-rotation pin.

[0009] In a specific embodiment of this utility model, the mechanical seal cover and the pump cover are connected and fixed by set bolts.

[0010] In a specific embodiment of this utility model, when a packing seal is used, the impeller, pump cover, and shaft remain unchanged, and the replacement parts are a packing bushing, packing, a packing ring, a packing shaft sleeve, and a packing gland. The packing bushing is fixed to the impeller hub through a stop in the pump cover cavity, and the packing shaft sleeve is installed on the shaft. The front end of the packing shaft sleeve is installed in the impeller hub of the impeller and the shaft shoulder. The shaft sleeve is fixed to the shaft by the axial force applied to the impeller by the impeller nut on the left and the shaft shoulder. The packing and the packing ring are installed close to the packing shaft sleeve. The packing and the packing ring are pressed together by the packing bushing on the left and the packing gland on the right.

[0011] In a specific embodiment of this utility model, a set screw is used to fix the packing gland to the pump cover, and the packing gland adjusts the packing compression degree by adjusting the set screw.

[0012] In a specific embodiment of this utility model, a protrusion is provided on one side of the packing gland, and the protrusion rests on the packing.

[0013] In a specific embodiment of this utility model, a flushing hole is provided on the pump cover, and the flushing hole is aligned with the sealing cavity.

[0014] The positive and progressive effects of this utility model are as follows: Compared with common technologies, the novel sealing cavity structure for pulp pumps provided by this utility model has the following advantages:

[0015] 1. The sealing cavity is designed to be universal for packing seals, single-end face mechanical seals, and double-end face mechanical seals, allowing for interchangeability of various sealing methods and achieving the effect of one unit serving multiple purposes, effectively reducing production costs.

[0016] 2. Conventionally, the packing sleeve and shaft are fastened together using a key during packing seal installation. This not only reduces shaft strength but also necessitates a thicker sleeve, increasing the size of the sealing cavity. This invention employs a novel sealing cavity structure where the sleeve is installed between the impeller hub and the shaft shoulder. During pump assembly, tightening the impeller nut causes the impeller hub and shaft shoulder to jointly press the sleeve together, eliminating the need for a key connection. This allows for a relatively thinner sleeve, reducing the size of the sealing cavity and thus lowering costs. Furthermore, the absence of a key connection eliminates the need for a keyway on the shaft, ensuring shaft strength and guaranteeing the safe operation of the unit. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the sealed cavity in this utility model.

[0018] Figure 2 This is a schematic diagram of the sealing cavity assembly corresponding to the single-end mechanical seal used in this utility model.

[0019] Figure 3 This is a schematic diagram of the sealing cavity assembly corresponding to the double-end mechanical seal used in this utility model.

[0020] Figure 4 This is a schematic diagram of the sealing cavity assembly corresponding to the packing seal used in this utility model.

[0021] The following are the names corresponding to the reference numerals in this utility model:

[0022] Impeller 1, pump cover 2, shaft 3, flushing hole 4;

[0023] 100 Single-end mechanical seal, 104 Shaft sleeve, 105 Single-end mechanical seal component, 106 Mechanical seal gland, 107 Set screw;

[0024] Double-end mechanical seal 200, first sealing ring 201, second sealing ring 202, mechanical seal bushing 203, medium end sealing ring 204, mechanical seal gland 205, set bolt 206, gas end sealing ring 207, anti-rotation pin 208;

[0025] 300 packing seal, 304 packing bushing, 305 packing, 306 packing ring, 307 packing bushing, 308 packing gland, 309 set screw, 3081 protrusion. Detailed Implementation

[0026] The preferred embodiments of this utility model are given below with reference to the accompanying drawings to illustrate the technical solution of this utility model in detail.

[0027] To address the aforementioned problems, this utility model proposes a novel sealing cavity structure for pulp pumps. Figure 1 This is a schematic diagram of the sealed cavity in this utility model, as shown below. Figure 1As shown, the sealing cavity is the space enclosed by the impeller 1, pump cover 2, and shaft 3. A replaceable component is installed within the sealing cavity, which can be one of three types: a single-end mechanical seal 100, a double-end mechanical seal 200, or a packing seal 300. The pump cover of this invention has a pre-drilled flushing hole 4 to accommodate various sealing schemes under different operating conditions. The aforementioned mechanical seals include single-end mechanical seals and double-end mechanical seals; therefore, this invention satisfies three sealing structures: a single-end mechanical seal, a double-end mechanical seal, and a packing seal.

[0028] Figure 2 This is a schematic diagram of the sealing cavity assembly corresponding to the single-end mechanical seal used in this utility model, as shown below. Figure 2 As shown, this utility model proposes a single-end mechanical seal in which the impeller 1, pump cover 2, and shaft 3 remain unchanged. The single-end mechanical seal 100 includes a shaft sleeve 104 and a single-end mechanical seal component 105. The shaft sleeve 104 is installed in the impeller hub of the impeller 1 and the shoulder of the shaft 3, and is fixed to the shaft 3. The single-end mechanical seal component 105 is installed on the right side of the shaft sleeve 104, and the mechanical seal cover 106 is connected and fixed to the pump cover 2. In specific implementation, the mechanical seal shaft sleeve 104 is fixed to the shaft 3 with a nut, and the mechanical seal cover 106 is connected and fixed to the pump cover 2 with a set screw 107.

[0029] Figure 3 This is a schematic diagram of the sealing cavity assembly corresponding to the double-end mechanical seal used in this utility model. Figure 3 As shown: When using a double-end mechanical seal, the impeller 1, pump cover 2, and shaft 3 remain unchanged. The replacement part is a double-end mechanical seal 200, which includes a mechanical seal shaft sleeve 203, a medium-end sealing ring 204, a mechanical seal gland 205, and an air-end sealing ring 207. The mechanical seal shaft sleeve 203 of the double-end mechanical seal 200 is installed in the impeller hub and the shoulder of the shaft 3. Two sealing rings, the first sealing ring 201 and the second sealing ring 202, are used for radial and axial sealing. The medium-end sealing ring 204 is clamped on the mechanical seal shaft sleeve 203, and the air-end sealing ring 207 is installed on the shaft and fixed with an anti-rotation pin 208. The mechanical seal gland 205 is fixed to the pump cover 2.

[0030] In the specific implementation process, the mechanical seal cover 205 is connected to the pump cover 2 by the set bolt 206.

[0031] Figure 4 This is a schematic diagram of the sealing cavity assembly corresponding to the packing seal used in this utility model, as shown below. Figure 4As shown: When using packing seal 300, the impeller 1, pump cover 2, and shaft 3 remain unchanged. The replacement parts are packing bushing 304, packing 305, packing ring 306, packing shaft sleeve 307, and packing gland 308. The packing bushing 304 is fixed to the impeller hub through the stop in the pump cover cavity. The packing shaft sleeve 307 is installed on the shaft 3. The packing 305 and packing ring 306 are installed close to the packing shaft sleeve 307. The packing 305 and packing ring 306 are pressed together by the packing bushing 304 on the left and the packing gland 308 on the right. The packing gland 308 is fixed to the pump cover 2 by the set screw 309. The packing gland 308 is adjusted by the set screw 309 to adjust the packing tightness to avoid being too tight or too loose.

[0032] In this utility model, a protrusion 3081 is provided on one side of the packing gland 308, and the protrusion 3081 rests on the packing 305.

[0033] The pump cover 2 of this utility model is provided with a flushing hole 4, which is aligned with the sealing cavity.

[0034] The existing sealing chamber requires a separate design of the required pump cover according to the different sealing methods, which means that one pump needs to be equipped with multiple pump covers. This not only results in a long design cycle and high production costs, but also makes subsequent maintenance and replacement inconvenient.

[0035] The novel sealing cavity structure for pulp pumps proposed in this utility model, through the special design of the pump cover cavity, allows a single pump to be equipped with only one type of pump cover to meet the selection of multiple sealing methods, thereby reducing the time spent on design and production, improving work efficiency, and reducing production costs.

[0036] Conventionally, the packing sleeve and shaft are fastened together using a key during packing seal installation. This method not only reduces shaft strength but also necessitates a thicker sleeve, increasing the size of the sealing cavity. This invention employs a novel sealing cavity structure where the sleeve is installed between the impeller hub and the shaft shoulder. When the impeller nut is tightened during pump assembly, the axial force applied to the nut is transferred to the impeller. At this point, the impeller hub and shaft shoulder together press the sleeve together, eliminating the need for a key connection. This allows for a relatively thinner sleeve, reducing the size of the sealing cavity and thus lowering costs. Furthermore, the absence of a key connection eliminates the need for a keyway on the shaft, ensuring shaft strength and guaranteeing the safe operation of the unit.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A novel seal chamber configuration for a pulp pump, characterized by: The new sealing cavity for the pulp pump is composed of a space surrounded by an impeller, a pump cover and a shaft, and a replacement part is arranged in the sealing cavity, and the replacement part is one of the following three: a single-end mechanical seal, a double-end mechanical seal or a packing seal.

2. The novel seal chamber configuration for a pulp pump as claimed in claim 1, wherein: When the single-end mechanical seal is used, the impeller, the pump cover and the shaft remain unchanged, a shaft sleeve is installed in an impeller hub of the impeller and a shaft shoulder of the shaft, the shaft sleeve is fixed on the shaft by an axial force applied to the impeller by a left impeller nut and the shaft shoulder, and the single-end mechanical seal is installed on the right side of the shaft sleeve.

3. The novel seal chamber configuration for a pulp pump according to claim 2, characterized in that: A machine seal cover is connected and fixed to the pump cover by a set screw.

4. The novel seal cavity structure for pulp pump as claimed in claim 1 wherein: When the double-end mechanical seal is used, the impeller, the pump cover and the shaft remain unchanged, the replacement part is a double-end mechanical seal, the double-end mechanical seal comprises a machine seal sleeve, a medium-end sealing ring, a machine seal cover and an air-end sealing ring, the machine seal sleeve of the double-end mechanical seal is installed in the impeller hub and the shaft shoulder, the machine seal sleeve is fixed on the shaft by the axial force applied to the impeller by the left impeller nut and the shaft shoulder, and two sealing rings are used for radial and axial sealing; the medium-end sealing ring is clamped on the machine seal sleeve, the air-end sealing ring is installed on the shaft, and an anti-rotation pin is used for fixation.

5. The novel seal chamber configuration for a pulp pump according to claim 4, characterized in that: The machine seal cover is connected and fixed to the pump cover by a set screw.

6. The novel seal chamber configuration for pulp pumps as claimed in claim 1, wherein: When the packing seal is used, the impeller, the pump cover and the shaft remain unchanged, and the replacement part comprises a packing bushing, a packing, a packing ring, a packing sleeve and a packing cover; the packing bushing is fixed to the impeller hub by a stop in the pump cover cavity, the packing sleeve is installed on the shaft, the front end of the packing sleeve is installed in the impeller hub and the shaft shoulder, the packing sleeve is fixed on the shaft by the axial force applied to the impeller by the left impeller nut and the shaft shoulder, the packing and the packing ring are installed in close contact with the packing sleeve, and the packing and the packing ring are pressed by the packing bushing on the left and the packing cover on the right.

7. The novel seal chamber configuration for a pulp pump according to claim 6, characterized in that: The packing cover is fixed on the pump cover by a set screw, and the packing cover adjusts the pressing degree of the packing by the set screw.

8. The novel seal cavity structure for a pulp pump according to claim 7, characterized in that: One side of the packing cover is provided with a protrusion, and the protrusion is located on the packing.

9. A novel seal chamber configuration for a pulp pump according to any one of claims 1-8, characterized in that: The pump cover is provided with a flushing hole, and the flushing hole is aligned with the sealing cavity.

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