阅读说明：本技术 一种水平中开离心泵轴封结构 (Horizontal split centrifugal pump shaft seal structure ) 是由 支发林 李广一 康蕾蕾 于 2018-09-10 设计创作，主要内容包括：本发明实施例涉及一种水平中开离心泵轴封结构,所述水平中开离心泵轴封结构包括：泵轴、泵盖、泵体、通用密封体、填料轴套、填料、填料环和两个分半式填料压盖；所述填料轴套呈圆筒状,套接于所述泵轴上；所述通用密封体的横截面为倒置凸字形,通过多个连接螺栓安装于所述泵盖与所述泵体上；所述填料装置于所述填料轴套和所述通用密封体之间,且所述填料的一端抵接于所述通用密封体上；所述填料环安设于所述填料轴套和所述通用密封体之间,并置于所述填料中；两个所述分半式填料压盖相对接,安装在所述填料轴套和所述通用密封体之间；所述分半式填料压盖上抵接所述填料的另一端。本发明组装更便捷,密封方式互换性好,降低了零件管理成本。(The embodiment of the invention relates to a shaft seal structure of a horizontal split centrifugal pump, which comprises: the pump comprises a pump shaft, a pump cover, a pump body, a universal sealing body, a packing shaft sleeve, packing, a packing ring and two halved packing glands; the packing shaft sleeve is cylindrical and is sleeved on the pump shaft; the cross section of the universal sealing body is in an inverted convex shape and is arranged on the pump cover and the pump body through a plurality of connecting bolts; the filler is arranged between the filler shaft sleeve and the universal sealing body, and one end of the filler is abutted against the universal sealing body; the packing ring is arranged between the packing shaft sleeve and the universal sealing body and is arranged in the packing; the two halved packing glands are butted and arranged between the packing shaft sleeve and the universal sealing body; the split packing gland is abutted against the other end of the packing. The invention has the advantages of more convenient assembly, good interchangeability of sealing modes and reduced part management cost.)

1. The utility model provides a horizontal centrifugal pump shaft seal structure of opening, its characterized in that, horizontal centrifugal pump shaft seal structure of opening includes: the pump comprises a pump shaft, a pump cover, a pump body, a universal sealing body, a packing shaft sleeve, packing, a packing ring and two halved packing glands;

the packing shaft sleeve is cylindrical and is sleeved on the pump shaft;

the cross section of the universal sealing body is in an inverted convex shape and is arranged on the pump cover and the pump body through a plurality of connecting bolts;

the filler is arranged between the filler shaft sleeve and the universal sealing body, and one end of the filler is abutted against the universal sealing body;

the packing ring is arranged between the packing shaft sleeve and the universal sealing body and is arranged in the packing;

the two halved packing glands are butted and arranged between the packing shaft sleeve and the universal sealing body; the split packing gland is abutted against the other end of the packing and used for compressing the packing.

2. The horizontal split centrifugal pump shaft seal structure according to claim 1, wherein the split packing gland comprises a compression portion, two butt lugs, and a transition connection portion;

the compressing part is arranged between the filler shaft sleeve and the universal sealing body; the other end of the filler is abutted against the inner side surface of the pressing part;

the two butt-joint lugs are respectively arranged at two ends of the pressing part; the two butt-joint lugs are symmetrically arranged relative to the symmetry axis of the pressing part and are arranged in a staggered manner relative to the axis of the pressing part;

the transition connecting part is connected between the pressing part and the butt joint lug.

3. The horizontal split centrifugal pump shaft seal structure according to claim 2, wherein the abutting lugs of the two split gland covers are abutted against each other and fixedly connected by a connecting stud, so that the two split gland covers are installed between the packing shaft sleeve and the universal seal body.

4. The horizontal split centrifugal pump shaft seal structure according to claim 1, wherein an axial seal groove is formed in one end, far away from the vertical portion, of the horizontal portion of the universal seal body; a radial sealing groove is formed in one end, close to the horizontal part, of the vertical part of the universal sealing body; and first sealing rings are arranged in the axial sealing groove and the radial sealing groove.

5. The horizontal split centrifugal pump shaft seal structure according to claim 1, wherein a second seal ring is disposed between the packing shaft sleeve and the pump shaft.

6. The horizontal split centrifugal pump shaft seal structure according to claim 4 or 5, wherein the first seal ring and the second seal ring are both rubber seal rings.

7. The horizontal split centrifugal pump shaft seal structure of claim 1, wherein the filler shaft sleeve and the pump shaft are axially positioned by a plurality of set screws and circumferentially positioned by a C-key.

8. The utility model provides a horizontal centrifugal pump shaft seal structure of opening, its characterized in that, horizontal centrifugal pump shaft seal structure of opening includes: the pump comprises a pump shaft, a pump cover, a pump body, a universal sealing body, a mechanical seal and a mechanical seal gland;

the cross section of the universal sealing body is in an inverted convex shape and is arranged on the pump cover and the pump body through a plurality of connecting studs;

the mechanical seal is arranged between the pump shaft and the universal seal body, and one end of the mechanical seal is abutted against the universal seal body;

the mechanical seal gland is arranged at one end of the universal seal body through the connecting stud; and the machine seal pressing cover is abutted against the other end of the mechanical seal and used for sealing and pressing the mechanical seal.

9. The shaft seal structure of the horizontal split centrifugal pump according to claim 8, wherein an axial seal groove is formed on one end of the horizontal part of the universal seal body, which is far away from the vertical part; a radial sealing groove is formed in one end, close to the horizontal part, of the vertical part of the universal sealing body; and first sealing rings are arranged in the axial sealing groove and the radial sealing groove.

10. The horizontal split centrifugal pump shaft seal structure of claim 8, wherein a second seal ring is disposed between the mechanical seal gland and the universal seal body and between the mechanical seal and the mechanical seal.

Technical Field

The invention relates to the technical field of centrifugal pump equipment, in particular to a horizontal split centrifugal pump shaft seal structure.

Background

The horizontal split centrifugal pump has the characteristics of large flow and relatively stable operation, and is widely applied to the fields of municipal water conservancy, ferrous metallurgy, water plants, power plants and the like. As an important core component of the horizontal split pump, the pump body and the pump cover adopt a horizontal split structural form, and the tightness of the split surface and the tightness of the shaft ends at two sides have important influence on the hydraulic performance and the comprehensive operation performance of the whole pump set. Therefore, the mode and the form of the shaft end sealing structure are key factors for guaranteeing the efficient and stable operation of the pump set.

The existing horizontal split centrifugal pump has two main pump sealing structure modes: the packing seal and the mechanical seal have no interchangeability of parts in two sealing forms, and the sealing mode is very complicated and high in cost when a user replaces the sealing mode on site. In addition, in the existing packing shaft seal mode, the sealing performance of the packing shaft sleeve is poor, the phenomena of inaccurate positioning and axial movement often occur, the packing needs to be replaced periodically during packing sealing, and the existing packing gland is of an integral structure and needs to be detached from a shaft head, so that the disassembly and maintenance are complicated and time-consuming, and the maintenance cost is high.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a horizontal centrifugal pump shaft seal structure which is more convenient to assemble, has good interchangeability of seal modes, improves the standardization and modularization degree of parts and reduces the cost.

In order to achieve the above object, in a first aspect, the present invention provides a horizontal middle-open centrifugal pump shaft seal structure, including: the pump comprises a pump shaft, a pump cover, a pump body, a universal sealing body, a packing shaft sleeve, packing, a packing ring and two halved packing glands;

the packing shaft sleeve is cylindrical and is sleeved on the pump shaft;

the cross section of the universal sealing body is in an inverted convex shape and is arranged on the pump cover and the pump body through a plurality of connecting bolts;

the filler is arranged between the filler shaft sleeve and the universal sealing body, and one end of the filler is abutted against the universal sealing body;

the packing ring is arranged between the packing shaft sleeve and the universal sealing body and is arranged in the packing;

the two halved packing glands are butted and arranged between the packing shaft sleeve and the universal sealing body; the split packing gland is abutted against the other end of the packing and used for compressing the packing.

Preferably, the split packing gland comprises a compression part, two butt lugs and a transition connecting part;

the compressing part is arranged between the filler shaft sleeve and the universal sealing body; the other end of the filler is abutted against the inner side surface of the pressing part;

the two butt-joint lugs are respectively arranged at two ends of the pressing part; the two butt-joint lugs are symmetrically arranged relative to the symmetry axis of the pressing part and are arranged in a staggered manner relative to the axis of the pressing part;

the transition connecting part is connected between the pressing part and the butt joint lug.

Further preferably, the butt-joint lugs of the two halved gland bushes are mutually butted and fixedly connected through a connecting stud, so that the two halved gland bushes are installed between the packing shaft sleeve and the universal sealing body.

Preferably, an axial seal groove is formed in one end, far away from the vertical part, of the horizontal part of the universal seal body; a radial sealing groove is formed in one end, close to the horizontal part, of the vertical part of the universal sealing body; and first sealing rings are arranged in the axial sealing groove and the radial sealing groove.

Preferably, a second sealing ring is arranged between the packing shaft sleeve and the pump shaft.

Further preferably, the first seal ring and the second seal ring are both rubber seal rings.

Preferably, the axial positioning is performed between the packing shaft sleeve and the pump shaft through a plurality of set screws, and the circumferential positioning is performed through a C-shaped key.

In a second aspect, the present invention further provides a horizontal middle-open centrifugal pump shaft seal structure, including: the pump comprises a pump shaft, a pump cover, a pump body, a universal sealing body, a mechanical seal and a mechanical seal gland;

the cross section of the universal sealing body is in an inverted convex shape and is arranged on the pump cover and the pump body through a plurality of connecting studs;

the mechanical seal is arranged between the pump shaft and the universal seal body, and one end of the mechanical seal is abutted against the universal seal body;

the mechanical seal gland is arranged at one end of the universal seal body through the connecting stud; and the machine seal pressing cover is abutted against the other end of the mechanical seal and used for sealing and pressing the mechanical seal.

Preferably, an axial seal groove is formed in one end, far away from the vertical part, of the horizontal part of the universal seal body; a radial sealing groove is formed in one end, close to the horizontal part, of the vertical part of the universal sealing body; and first sealing rings are arranged in the axial sealing groove and the radial sealing groove.

Preferably, second sealing rings are arranged between the mechanical sealing cover and the universal sealing body as well as between the mechanical sealing body and the universal sealing body.

The horizontal split centrifugal pump shaft seal structure provided by the embodiment of the invention has the advantages that the horizontal split centrifugal pump shaft seal position is more conveniently assembled, the interchangeability of the seal mode is good, the standardization and modularization degree of parts is greatly improved by the design of a universal seal body, the part management cost is reduced, the positioning is more accurate, the sealing performance is good, the pump set applying the horizontal split centrifugal pump shaft seal structure provided by the invention has good operation hydraulic performance and operation stability, the test parameters of vibration and noise are small, and the disassembly, the assembly and the maintenance are convenient. In addition, the split packing gland in the packing sealing mode adopts a specific structural design, so that the disassembly, assembly and maintenance of the centrifugal pump shaft sealing structure are more convenient, and the later-stage packing replacement and maintenance cost is saved to a great extent.

Drawings

FIG. 1 is a schematic structural diagram of a packing sealing manner of a horizontal centrifugal pump shaft seal structure according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a universal seal body of a horizontal split centrifugal pump shaft seal structure provided in an embodiment of the present invention;

FIG. 3 is a cross-sectional view A-A of a universal seal body of a horizontal split centrifugal pump seal configuration provided by an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a packing shaft sleeve of a horizontal centrifugal pump shaft seal structure according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view A-A of a packing sleeve of a horizontal split centrifugal pump shaft seal configuration provided by an embodiment of the present invention;

FIG. 6 is a C-C cross-sectional view of a packing sleeve of a horizontal split centrifugal pump shaft seal configuration provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a split packing gland of a horizontal split centrifugal pump shaft seal structure according to an embodiment of the present invention;

FIG. 8 is a sectional view taken along line A-A of a split packing gland of a horizontal split centrifugal pump shaft seal structure provided in accordance with an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a mechanical sealing manner of a horizontal centrifugal pump shaft seal structure according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

The embodiment of the invention relates to a shaft seal structure of a horizontal split centrifugal pump, which is provided by the invention, so that the shaft seal position assembly of the horizontal split centrifugal pump is more convenient, the interchangeability of a sealing mode is good, the standardization and modularization degree of parts is greatly improved by the design of a universal sealing body, the management cost of the parts is reduced, the positioning is more accurate, the sealing performance is good, the running hydraulic performance and the running stability of a pump set applying the shaft seal structure of the horizontal split centrifugal pump are better, the test parameters of vibration and noise are small, and the disassembly, assembly and maintenance are convenient.

It is to be understood that the following specific examples are illustrative of the invention and are not to be construed as limiting the invention. The embodiment of the invention provides a horizontal split centrifugal pump shaft seal structure in a packing sealing mode and a horizontal split centrifugal pump shaft seal structure in a mechanical sealing mode, and parts of the horizontal split centrifugal pump shaft seal structure and the horizontal split centrifugal pump shaft seal structure are universal.

The shaft seal structure of the horizontal split centrifugal pump adopting the packing sealing mode and the mechanical sealing mode is respectively described below.

Fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, and fig. 8 are respectively a schematic structural diagram of a packing sealing manner of a horizontal split centrifugal pump shaft seal structure, a schematic structural diagram of a universal sealing body, a sectional view a-a of the universal sealing body, a schematic sectional structural diagram of a packing shaft sleeve, a sectional view a-a of the packing shaft sleeve, a sectional view C-C of the packing shaft sleeve, a schematic structural diagram of a split packing gland, and a sectional view a-a of the split packing gland according to an embodiment of the present invention. With reference to fig. 1, 2, 3, 4, 5, 6, 7 and 8, a packing seal type horizontal centrifugal pump shaft seal structure will be described:

the packing sealing mode horizontal split centrifugal pump shaft seal structure provided by the embodiment of the invention comprises: the pump comprises a pump shaft 108, a pump cover 107, a pump body 104, a protective cover 101, a universal sealing body 105, a packing shaft sleeve 114, packing 112, a packing ring 113 and two halved packing glands 111.

Specifically, the pump shaft 108, the pump cover 107, and the pump body 104 constitute a main structure of the pump group, and shield the coupling portion by the shield 101. The pump shaft 108 is a transmission bearing part of the pump unit, and provides tensile and torsional functions in the operation process of the rotor part of the pump unit.

The packing sleeve 114 protects the pump shaft 108 from wear and preferably has a surface hardness above HRC 40. In detail, as shown in fig. 4, 5 and 6, the packing sleeve 114 is cylindrical, and has a plurality of through holes (not shown) uniformly spaced on a circumferential surface of one end thereof for fixing the set screw 102, and a key groove (not shown) formed on an inner side surface of the other end thereof for fixing the C-shaped key 116. The packing shaft sleeve 114 is sleeved on the pump shaft 108, one end of the packing shaft sleeve, which is provided with a key groove, is positioned by adopting a shaft shoulder, the packing shaft sleeve 114 and the pump shaft 108 are circumferentially positioned by installing a C-shaped key 116, the other end of the packing shaft sleeve is axially positioned by penetrating through a plurality of set screws 102 in through holes, the packing shaft sleeve 114 and the pump shaft 108 are prevented from moving relatively, and the problems of inaccurate positioning and axial movement in a packing sealing mode are solved.

In one particular implementation, a second seal 110 is provided between the packing sleeve 114 and the pump shaft 108 to prevent the transmission medium from leaking axially. Preferably, the second sealing ring 110 is a rubber sealing ring.

The universal sealing body 105 is an important part of the shaft sealing position, prevents the filler sealing component from being washed by a transmission medium and prevents impurities such as iron wires and silk threads from damaging the filler sealing component, and ensures the stable work of the filler sealing component. In detail, as shown in fig. 2 and 3, the cross section of the universal sealing body 105 is in an inverted convex shape, and a plurality of positioning holes (not shown) and threaded holes (not shown) are uniformly formed in the circumferential direction of the connecting portion at equal intervals, the positioning holes assist in the installation and positioning of the universal sealing body 105, and the threaded holes are used for installing the connecting bolts 103. The universal seal body 105 is attached to the pump cover 107 and the pump body 104 by a plurality of connection bolts 103.

Meanwhile, an axial sealing groove is formed in one end, far away from the vertical part, of the horizontal part of the universal sealing body 105, a radial sealing groove is formed in one end, close to the horizontal part, of the vertical part of the universal sealing body 105, first sealing rings 106 are arranged in the axial sealing groove and the radial sealing groove respectively, and the first sealing rings 106 are arranged between the universal sealing body 105 and the pump cover 107 and the pump body 104 to prevent transmission media from leaking in the radial direction and the axial direction. Preferably, the first sealing ring 106 is a rubber sealing ring.

The packing 112 is a component playing a role in sealing in the shaft seal structure, the packing 112 is arranged between the packing shaft sleeve 114 and the general sealing body 105, one end of the packing 112 abuts against the general sealing body 105, and the other end abuts against the split packing gland 111, so that the packing is tightly pressed and arranged between the packing shaft sleeve 114 and the general sealing body 105 to play a role in sealing.

The packing ring 113 is a component of the shaft seal structure for performing a flushing cooling function, the packing ring 113 is arranged between the packing sleeve 114 and the universal sealing body 105, and the packing ring 113 is arranged in the packing 112 for performing the flushing cooling function on the packing 112.

In addition, the shaft seal structure of the horizontal split centrifugal pump adopting the packing sealing mode provided by the embodiment of the invention is also provided with two split-type packing glands 111, and has the structural characteristic of split-type self-locking, so that the shaft seal structure has the function of convenient and fast installation and disassembly, and the packing 112 is properly pressed through the split-type packing glands 111, thereby better achieving the purpose of shaft seal. The two half-type gland covers 111 are butted and installed between the gland bush 114 and the universal sealing body 105, and the other end of the packing 112 is abutted on the half-type gland cover 111 to press the packing 112.

In detail, as shown in fig. 7 and 8, the half packing gland 111 includes a pressing portion 1111, two abutting lugs 1112 and a transition connection portion 1113, the pressing portion 1111 is installed between the packing sleeve 114 and the universal sealing body 105, and the other end of the packing 112 abuts against the inner side surface of the pressing portion 1111; the two butt-joint lugs 1112 are respectively arranged at two ends of the pressing part 1111, the two butt-joint lugs 1112 are symmetrically arranged about the symmetry axis of the pressing part 1111 and are arranged in a staggered manner about the axis of the pressing part 1111; the transition connection portion 1113 is connected between the pressing portion 1111 and the abutting lug 1112. When the split packing gland 111 is installed and fixed, the pressing portions 1111 of the two split packing glands 111 are combined into a complete hollow cylinder, the two abutting lugs 1112 of the two split packing glands 111 are respectively abutted against each other, the abutting lugs 1112 on the same side of the two split packing glands 111 are vertically separated and have coincident central axes, and are fixedly connected through the connecting stud 109, the two split packing glands 111 are installed between the packing shaft sleeve 114 and the universal seal body 105, and the packing 112 arranged between the packing shaft sleeve 114 and the universal seal body 105 is properly pressed, so that the purpose of shaft seal is finally achieved.

Fig. 9, fig. 2, and fig. 3 are a schematic structural diagram of a mechanical sealing manner of a horizontal centrifugal pump shaft seal structure, a schematic structural diagram of a universal sealing body, and a cross-sectional view a-a of the universal sealing body, respectively, according to an embodiment of the present invention. With reference to fig. 9, 2 and 3, a mechanical seal type horizontal centrifugal pump shaft seal structure will be described:

the mechanical seal mode horizontal split centrifugal pump shaft seal structure provided by the embodiment of the invention comprises: pump shaft 201, pump cover 203, pump body 208, protective cover 207, universal seal body 210, mechanical seal 209, and mechanical seal cover 202.

Specifically, the pump shaft 201, the pump cover 203, and the pump body 208 constitute a main structure of the pump group, and shield the coupling portion by a shield 207. The pump shaft 201 is a transmission bearing part of the pump unit, and provides tensile and torsional functions in the operation process of a rotor part of the pump unit.

The universal seal body 210 is an important part of the shaft seal position, prevents the mechanical seal assembly from being damaged by scouring of transmission media and impurities such as iron wires and silk threads, and ensures the stable work of the mechanical seal assembly. The structure of the universal sealing body 210 in the mechanical sealing manner is completely the same as that of the universal sealing body 105 in the packing sealing manner, as shown in fig. 2 and 3, the cross section of the universal sealing body 210 is in an inverted convex shape, a plurality of positioning holes and threaded holes are uniformly formed in the circumferential direction of the connecting portion at equal intervals, the positioning holes assist in mounting and positioning the universal sealing body 210, and the threaded holes are used for mounting the connecting studs 206. The universal seal body 210 is attached to the pump cover 203 and the pump body 208 by a plurality of connection studs 206.

Meanwhile, an axial sealing groove is formed in one end, far away from the vertical portion, of the horizontal portion of the universal sealing body 210, and the first sealing ring 204 is arranged in the axial sealing groove and located between the universal sealing body 210 and the pump cover 203 and the pump body 208, so that the transmission medium is prevented from leaking in the axial direction. One end of the vertical part of the general sealing body 210, which is close to the horizontal part, is provided with a radial sealing groove, and a first sealing ring 204 in the radial sealing groove is also arranged in the radial sealing groove and is positioned between the general sealing body 210 and the pump cover 203 and the pump body 208, so that the transmission medium is prevented from leaking in the radial direction. Preferably, the first sealing ring 204 is a rubber sealing ring.

The mechanical seal 209 is one of the main components of the mechanical sealing method of the shaft seal structure, the mechanical seal 209 is disposed between the pump shaft 201 and the universal seal body 210, and one end of the mechanical seal 209 abuts against the universal seal body 210 and the other end abuts against the mechanical seal cover 202, thereby performing compression sealing.

The mechanical seal gland 202 is also one of the main components of the mechanical seal mode of the shaft seal structure, the mechanical seal gland 202 is mounted at one end of the universal seal body 210 through the connecting stud 206, and the other end of the mechanical seal 209 is abutted to the mechanical seal gland 202 to seal and press the mechanical seal 209, so that the normal operation of the shaft seal structure of the mechanical seal mode is ensured.

In order to further ensure the sealing performance of the shaft seal structure, a second sealing ring 205 is arranged between the mechanical seal gland 202 and the universal seal body 210 and the mechanical seal 209. Preferably, the second sealing ring 205 is a rubber sealing ring.

The above description is provided for the respective components of the two sealing manners of the horizontal centrifugal pump shaft seal structure and the connection relationship therebetween, and the following description is provided for the working principle of the horizontal centrifugal pump shaft seal structure and the process of interchanging the two sealing manners with reference to fig. 1 to 9.

In this embodiment, when a packing sealing manner is adopted, the packing shaft sleeve 114 is sleeved on the pump shaft 108, the axial positioning between the packing shaft sleeve 114 and the pump shaft 108 is performed by the plurality of set screws 102, and the circumferential positioning between the packing shaft sleeve 114 and the pump shaft 108 is performed by the C-shaped key 116. Then the universal sealing body 105 is fixed on the pump cover 107 and the pump body 104 through a plurality of connecting bolts 103, the packing 112 is arranged between the packing shaft sleeve 114 and the universal sealing body 105, the packing ring 113 is arranged in the packing 112, and finally, the packing 112 is properly pressed through fixedly connecting two half-type packing pressing covers 111, so that the purpose of shaft sealing is realized.

When a user wants to change the packing sealing mode into a mechanical sealing mode, the two half-split packing gland 111, the packing 112, the packing ring 113, the packing shaft sleeve 114 and the connecting bolt 103 are detached in sequence, and the universal sealing body 105, namely the universal sealing body 210 shown in fig. 9, is reserved. When the mechanical seal is installed, the mechanical seal 209 is installed between the pump shaft 201 and the universal seal body 210, then the other end of the mechanical seal 209 is sealed and pressed by the mechanical seal cover 202, and the mechanical seal cover 202 and the universal seal body 210 are fixedly connected to the pump cover 203 and the pump body 208 in sequence by the connecting stud 206, so that the installation of the mechanical seal mode is completed.

The horizontal split centrifugal pump shaft seal structure provided by the embodiment of the invention has the advantages that the horizontal split centrifugal pump shaft seal position is more conveniently assembled, the interchangeability of the seal mode is good, the standardization and modularization degree of parts is greatly improved by the design of a universal seal body, the part management cost is reduced, the positioning is more accurate, the sealing performance is good, the pump set applying the horizontal split centrifugal pump shaft seal structure provided by the invention has good operation hydraulic performance and operation stability, the test parameters of vibration and noise are small, and the disassembly, the assembly and the maintenance are convenient. In addition, the split packing gland in the packing sealing mode adopts a specific structural design, so that the disassembly, assembly and maintenance of the centrifugal pump shaft sealing structure are more convenient, and the later-stage packing replacement and maintenance cost is saved to a great extent.

In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.