Universal paper pulp pump sealing structure

Abstract

The utility model discloses a universal paper pulp pump sealing structure, which is characterized in that a key slot for connecting a motor is arranged at the first end part of a pump shaft, a full-pump-shaft keyway-free connection mode is adopted, an impeller is connected with the second end part of the pump shaft in a thread fit manner, and a fastening screw is adopted for fixing; a mechanical seal shaft sleeve of the mechanical seal assembly and a packing shaft sleeve of the packing seal assembly are fixed with the pump shaft through locking screws, so that key grooves in the pump shaft are reduced, stress concentration generated at the key grooves is avoided, meanwhile, torque transmitted by the pump shaft is more uniform, and therefore the structure of the paper pulp pump is stable and reliable; large stress can be borne, and damage is not prone to occurring; meanwhile, an inner cavity of a mechanical seal pump cover in the mechanical seal assembly is larger than an inner cavity of a filler pump cover in the filler seal assembly, so that the inner cavity of the mechanical seal pump cover can form a seal cavity with a large space, and therefore the paper pulp pump seal structure is suitable for mechanical seals of various sizes and specifications, universality of the paper pulp pump seal structure is improved, and maintenance cost is reduced at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of pulp pumps, in particular to a sealing structure of a pulp pump. Background Art

[0002] A pulp pump is mainly used for transporting pulp with high concentration, high viscosity, and containing a large amount of fibers and impurities. The sealing structure of a traditional pulp pump is as Figure 1 shown. A seal 1' is tightly combined with a pump body 2', a pump cover 3', etc., and is usually configured as an integrated structure, which cannot be disassembled and replaced separately.

[0003] Chinese Patent with Publication No. CN203584882 U discloses a double-suction pump that is common to packing and mechanical seals, including a stuffing box and a packing gland applicable to a mechanical seal pump cover and a mechanical seal pump body; when packing seal is selected, a stuffing box, packing seal, and water seal ring are sequentially loaded into the sealing cavity, and then the packing gland is pressed in; when mechanical seal is selected, the packing gland, stuffing box, packing seal, and water seal ring in the annular sealing cavity are taken out, and then the mechanical seal is installed, and the flushing water hole on the mechanical seal pump cover is sealed through screws and gaskets, so that the same pump can be applicable to packing seal and mechanical seal.

[0004] However, the sealing structure provided by the above solution is only applicable to mechanical seals with fixed size specifications when replacing the mechanical seal, and has low versatility, resulting in high production and maintenance costs; moreover, in the sealing structure provided by the above solution and traditional pulp pumps, components such as a pump shaft and a shaft sleeve are usually connected by a keyway and a key. During operation, if the pulp concentration transported by the pulp pump is too high or the medium temperature is too high, it is easy for the pump shaft to bear excessive stress, resulting in stress concentration and fracture.

[0005] Therefore, there is an urgent need in the art for a pulp pump sealing structure with high versatility, stable and reliable structure, and capable of withstanding large stresses and not being easily damaged during operation. Summary of the Utility Model

[0006] Aiming at the defects of the prior art, the purpose of the utility model is to provide a general-purpose pulp sealing structure with high versatility, stable and reliable structure, and capable of withstanding large stresses and not being easily damaged during operation.

[0007] To achieve the above purpose, the general-purpose pulp sealing structure provided by the utility model includes a pump body and an impeller, a pump shaft, and a sealing cavity arranged in the pump body, and a mechanical seal assembly and a packing seal assembly replaceably arranged in the sealing cavity.

[0008] Only one keyway for connecting with a motor is provided at the first end of the pump shaft, and the impeller is connected to the second end of the pump shaft by a threaded fit and fixed by a set screw.

[0009] The shaft sleeve of the mechanical seal assembly and the middle region of the pump shaft are fixed by lock screws, and the shaft sleeve of the packing seal assembly and the middle region of the pump shaft are fixed by lock screws.

[0010] The inner cavity of the pump cover of the mechanical seal assembly is larger than the inner cavity of the pump cover of the packing seal assembly.

[0011] Further, the mechanical seal assembly further includes a mechanical seal and a gland.

[0012] Further, the sealing cavity is formed by the inner cavity of the pump cover of the mechanical seal. The shaft sleeve of the mechanical seal is sleeved on the pump shaft. The mechanical seal is arranged outside the shaft sleeve of the mechanical seal. The gland of the mechanical seal is arranged at the end of the shaft sleeve of the mechanical seal, connecting the shaft sleeve of the mechanical seal and the pump cover of the mechanical seal.

[0013] Further, the packing seal assembly further includes packing and a packing gland.

[0014] Further, the sealing cavity is formed by the inner cavity of the pump cover of the packing seal. The shaft sleeve of the packing seal is sleeved on the pump shaft. The packing is arranged outside the shaft sleeve of the packing seal. The packing gland is arranged at the end of the shaft sleeve of the packing seal, connecting the shaft sleeve of the packing seal and the pump cover of the packing seal.

[0015] Further, the pump cover of the packing seal abuts against the packing.

[0016] The universal pulp pump sealing structure provided by the present utility model, except for having a keyway for connecting the motor at the first end of the pump shaft, adopts a connection method without keyways on the entire pump shaft. The impeller and the second end of the pump shaft are connected by thread fit and fixed with set screws. Moreover, the shaft sleeve of the mechanical seal assembly and the shaft sleeve of the packing seal assembly are both fixed to the pump shaft by lock screws, so as to reduce the setting of keyways on the pump shaft, avoid stress concentration at the keyways, and at the same time make the torque transmitted by the pump shaft more uniform, thereby making the structure of the pulp pump stable and reliable, capable of withstanding greater stress and not easily damaged. At the same time, the inner cavity of the pump cover of the mechanical seal assembly is larger than the inner cavity of the pump cover of the packing seal assembly, so that the inner cavity of the pump cover of the mechanical seal can form a sealing cavity with a larger space, thus being applicable to mechanical seals of various size specifications, improving the versatility of the pulp pump sealing structure and reducing the maintenance cost at the same time. Description of the Drawings

[0017] The present utility model will be further described below in conjunction with the drawings and specific embodiments.

[0018] Figure 1 It is a schematic diagram of the existing pulp pump sealing structure;

[0019] Figure 2Schematic diagram of the general pulp pump seal structure provided by the present utility model, which adopts a mechanical seal assembly;

[0020] Figure 3 Schematic diagram of the general pulp pump seal structure provided by the present utility model, which adopts a packing seal assembly;

[0021] Reference numerals:

[0022] 1. Pump body; 2. Impeller; 3. Pump shaft; 31. Thread; 32. Set screw; 33. Locking screw; 4. Seal cavity;

[0023] 5a. Mechanical seal assembly; 51a. Mechanical seal pump cover; 52a. Mechanical seal; 53a. Mechanical seal shaft sleeve; 54a. Mechanical seal gland;

[0024] 5b. Packing seal assembly; 51b. Packing pump cover; 52b. Packing; 53b. Packing shaft sleeve; 54b. Packing gland. Detailed implementation manners

[0025] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will be further described below with reference to specific illustrations.

[0026] See Figure 2 and Figure 3 , which show Embodiment 1 and Embodiment 2 of the general pulp pump seal structure provided by the present utility model.

[0027] As can be seen from the figure, the general pulp pump seal structure provided by the present utility model mainly includes a pump body 1, an impeller 2, a pump shaft 3 and a seal cavity 4 arranged in the pump body 1, and a mechanical seal assembly 5a and a packing seal assembly 5b that are alternatively arranged in the seal cavity 4.

[0028] Among them, except that a keyway for connecting to the motor is provided at the first end of the pump shaft 3, the pump shaft 3 is connected to other components of the pulp pump in a keyway-free manner. The impeller 2 is arranged at the second end of the pump shaft 3 and is connected to the pump shaft 3 through a thread 31 provided at the second end of the pump shaft 3 and is locked and fixed by a set screw 32. Further, the mechanical seal assembly 5a and the packing seal assembly 5b are connected to the pump shaft 3 by a locking screw 33 to reduce the setting of keyways on the pump shaft 3, avoid stress concentration at the keyway, and ensure the strength and stiffness of the pump shaft 3.

[0029] Preferably, there is a thread fit with a pitch between 25 mm and 40 mm between the pump shaft 3 and the thread 31 at the second end, so that when the impeller 2 is fitted and connected with the pump shaft 3, the contact between the pump shaft 3 and the hub of the impeller 2 is more uniform, thereby improving the efficiency and uniformity of torque transmission, making the structure of the pulp pump stable and reliable, capable of withstanding large stresses and not easily damaged.

[0030] In order to facilitate the maintenance and replacement of the sealing structure of the pulp pump, the mechanical seal assembly 5a and the packing seal assembly 5b can be replaceably arranged in the sealing cavity 4, so that the sealing structure of the pulp pump can adopt either the mechanical seal assembly 5a or the packing seal assembly 5b, which is convenient for maintenance.

[0031] Furthermore, the mechanical seal assembly 5a is mainly composed of a mechanical seal pump cover 51a, a mechanical seal 52a, a mechanical seal shaft sleeve 53a and a mechanical seal gland 54a, and the packing seal assembly 5b is mainly composed of a packing pump cover 51b, packing 52b, a packing shaft sleeve 53b and a packing gland 54b.

[0032] When the sealing structure of the pulp pump adopts the packing seal assembly 5b, the sealing cavity 4 is composed of the packing pump cover 51b of the packing seal assembly 5b. The packing pump cover 51b is arranged in the pump body 1, and a cavity capable of accommodating the packing 52b therein is formed between the pump shaft 3 and the packing pump cover 51b of the machine. The packing shaft sleeve 53b is sleeved on the pump shaft 3, and the packing shaft sleeve 53b and the pump shaft 3 are connected by a locking screw 33. The packing 52b is arranged outside the packing shaft sleeve 53b, and at the same time, the packing 52b abuts against the packing pump cover 51b to improve the sealing performance of the packing seal assembly 5b. The packing gland 54b is arranged at the end of the packing shaft sleeve 53b to connect the packing shaft sleeve 53b and the packing pump cover 51b, so that the packing seal assembly 5b is fixedly arranged in the pump body 1 as the sealing structure of the pulp pump.

[0033] When the packing seal assembly 5b is damaged and needs to be maintained and replaced, the packing seal assembly 5b is removed from the pump body 1 and can be replaced with a new packing seal assembly 5b or a mechanical seal assembly 5a, so that the sealing structure of the pulp pump has universality and is convenient for maintenance and replacement.

[0034] Furthermore, when the mechanical seal assembly 5a is adopted for the seal structure of the pulp pump, the seal cavity 4 is constituted by the mechanical seal pump cover 51a of the mechanical seal assembly 5a. The mechanical seal pump cover 51a is arranged in the pump body 1, and a cavity capable of accommodating the mechanical seal 52a therein is formed between the pump shaft 3 and the mechanical seal pump cover 51a, so that the mechanical seal shaft sleeve 53a is sleeved on the pump shaft 3, and the mechanical seal shaft sleeve 53a and the pump shaft 3 are connected by a locking screw 33. The mechanical seal 52a is arranged outside the mechanical seal shaft sleeve 53a, and the mechanical seal gland 54a is arranged at the end of the mechanical seal shaft sleeve 53a to connect the mechanical seal shaft sleeve 53a and the mechanical seal pump cover 51a, so that the mechanical seal assembly 5a is fixedly arranged in the pump body 1 as the seal structure of the pulp pump.

[0035] In order to improve the versatility of the seal structure of the pulp pump and be applicable to mechanical seals 52a of various size specifications, the inner cavity of the mechanical seal pump cover 51a in the mechanical seal assembly 5a is configured to be larger than the inner cavity of the stuffing box pump cover 51b in the stuffing seal assembly 5b, so as to form a larger space between the inner cavity of the mechanical seal pump cover 51a and the pump shaft 3, which can accommodate mechanical seals 52a of various size specifications. Without installing a specific model of mechanical seal, any specification of mechanical seal 52a adapted to the shaft diameter of the pump shaft 3 can be installed, thereby improving the versatility of the seal structure of the pulp pump and reducing the maintenance cost of the seal structure.

[0036] Here, the inner cavity of the mechanical seal pump cover 51a can be adjusted adaptively according to specific circumstances. Preferably, the mechanical seal pump cover 51a is configured to be able to accommodate the largest mechanical seal 52a that can be adapted to the shaft diameter of the pump shaft 3 to improve the versatility of the seal structure of the pulp pump.

[0037] The universal pulp pump seal structure provided by the present utility model adopts a connection method without a keyway on the entire pump shaft 3. The impeller 2, the mechanical seal assembly 5a and the stuffing seal assembly 5b are connected to the pump shaft 3 by screws, reducing the generation of stress concentration, improving the efficiency and uniformity of torque transmission, so that the pulp pump structure is stable and reliable, can withstand greater stress and is not easily damaged; and the mechanical seal assembly 5a and the stuffing seal assembly 5b are used in cooperation to realize the replacement and universality of the seal structure. The inner cavity of the mechanical seal pump cover 51a of the mechanical seal assembly 5a is larger to be applicable to mechanical seals 52a of various size specifications, improving the versatility and reducing the maintenance cost.

[0038] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A general-purpose pulp pump sealing structure, comprising a pump body, an impeller, a pump shaft and a sealing cavity arranged in the pump body, and a mechanical seal assembly and a packing seal assembly replaceably arranged in the sealing cavity, characterized in that, Only a keyway for connecting with the motor is provided at the first end of the pump shaft, the impeller is connected to the second end of the pump shaft by thread fit and fixed by a set screw. The mechanical seal shaft sleeve of the mechanical seal assembly is fixed to the middle area of the pump shaft by a locking screw, and the packing shaft sleeve of the packing seal assembly is fixed to the middle area of the pump shaft by a locking screw. The inner cavity of the mechanical seal pump cover in the mechanical seal assembly is larger than the inner cavity of the packing pump cover in the packing seal assembly.

2. The general pulp pump sealing structure according to claim 1, characterized in that, The mechanical seal assembly further includes a mechanical seal and a mechanical seal gland.

3. The general pulp pump seal structure according to claim 2, characterized in that, The sealing cavity is formed by the inner cavity of the mechanical seal pump cover, the mechanical seal shaft sleeve is sleeved on the pump shaft, the mechanical seal is arranged outside the mechanical seal shaft sleeve, and the mechanical seal gland is arranged at the end of the mechanical seal shaft sleeve to connect the mechanical seal shaft sleeve and the mechanical seal pump cover.

4. The general pulp pump sealing structure according to claim 1, characterized in that, The packing seal assembly further includes packing and a packing gland.

5. The general pulp pump seal structure according to claim 4, characterized in that, The sealing cavity is formed by the inner cavity of the packing pump cover, the packing shaft sleeve is sleeved on the pump shaft, the packing is arranged outside the packing shaft sleeve, and the packing gland is arranged at the end of the packing shaft sleeve to connect the packing shaft sleeve and the packing pump cover.

6. The general pulp pump seal structure according to claim 5, characterized in that, The packing pump cover abuts against the packing.

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