Mechanical seal for pump and pump thereof

Abstract

The pump comprises a shaft and a pump shell, an annular gap is formed between the shaft and the pump shell in the radial direction, the mechanical seal for the pump comprises a body component, the body component comprises a main body part and an extension part, the main body part is installed in the annular gap, and the extension part is installed in the annular gap; the extending part is provided with a first limiting part on the outer side of the outer side end surface, and the main body part is provided with a second limiting part; the first limiting mechanism is matched with the first limiting part and applies axial acting force to the body part, and the axial acting force abuts against the pump shell; and the pump shell is provided with a third limiting part, and the second limiting mechanism is matched with the second limiting part and the third limiting part and applies circumferential anti-rotation force to the body component. Precise positioning and reliable fixing of the body part on the pump shell can be achieved, deflection in the fastening process is avoided, meanwhile, circumferential rotation prevention is achieved, and the sealing performance, operation stability and overall reliability of mechanical sealing are improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular to a mechanical seal for pumps and the pump thereof. Background Technology

[0002] In fluid handling equipment with rotating shafts, such as centrifugal pumps, sliding ring seals are core shaft sealing components, and their installation and fixing methods directly affect sealing performance, assembly efficiency, and the overall compactness of the equipment. Traditional sliding ring seals mostly adopt a flange structure, fixing the mechanical seal body to the sealing cavity with fastening bolts or studs and nuts. If the above-mentioned traditional structure is adopted, a separate fixing flange or gland is required on the seal body, and multiple fixing holes need to be opened in the pump housing / housing cover. This not only leads to a complex seal structure and high manufacturing cost, but also occupies a large amount of equipment space, limiting the overall size design of the pump.

[0003] To address the aforementioned issues, a novel sliding ring seal structure is disclosed in related technology (CN1865738B). This structure eliminates the need for a separate flange component and achieves simultaneous axial and radial fastening of the seal body component on the pump housing / casing cover by setting an inclined fixing device on the seal body component and using screws.

[0004] The inventors of this application further discovered that the aforementioned tilting fixing method still has significant technical defects in practical applications: This structure uses a single tilted screw in conjunction with the tilting fixing device of the main body component for fastening. During screw tightening, the tilted tightening force causes uneven radial and axial forces on the main body component, easily leading to misalignment. This makes it difficult for the sealing end cap to reach the intended installation position, significantly reducing the radial centering accuracy and axial positioning accuracy of the main body component. Furthermore, the installation deviation of the main body component directly results in poor contact between the sliding sealing surfaces, not only reducing the sealing performance of the mechanical seal but also affecting the operational stability of the sealing element, leading to a decrease in the overall operational reliability of the mechanical seal and limiting the stable application of this optimized sealing structure in actual working conditions.

[0005] Therefore, how to further improve the structure of the above-mentioned integral sliding ring seal and solve problems such as misalignment of the main body components due to uneven tightening force, failure of the end cap to be in place, and decreased sealing performance has become the key to improving the operational reliability of this type of sliding ring seal.

[0006] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a mechanical seal for pumps and a pump thereof, which can achieve precise positioning and reliable fixing of the main body components on the pump housing, avoid misalignment during the tightening process, and simultaneously achieve circumferential anti-rotation, thereby improving the sealing performance, operational stability and overall reliability of the mechanical seal.

[0008] The specific technical solution of this utility model embodiment is as follows:

[0009] A mechanical seal for a pump, the pump including a shaft and a pump housing, wherein an annular gap is formed radially between the shaft and the pump housing, the mechanical seal for the pump including: a body component, the body component including: a main body portion and an extension portion, the main body portion being installed within the annular gap, the extension portion extending from the main body portion toward an outer end face of the pump housing, the extension portion having a first limiting portion located outside the outer end face, the main body portion having a second limiting portion; a first limiting mechanism, the first limiting mechanism cooperating with the first limiting portion to apply an axial force against the pump housing to the body component; a second limiting mechanism, the pump housing having a third limiting portion, the second limiting mechanism cooperating with the second limiting portion and the third limiting portion to apply a circumferential anti-rotation force to the body component.

[0010] In a preferred embodiment, the first limiting part includes a circumferential limiting groove disposed on the outer side wall of the extension portion. The first limiting mechanism includes a segmented fixing sleeve, a fastener, and an adjusting member. The segmented fixing sleeve is disposed in the circumferential limiting groove and is circumferentially fastened by the fastener. The segmented fixing sleeve is provided with a plurality of openings spaced apart along the circumferential direction. The adjusting member passes through the openings and can abut against the outer end face of the pump housing.

[0011] In a preferred embodiment, the split fixing sleeve includes a first mating portion and a second mating portion, and the fastener includes a first screw and a second screw. The first mating portion has through holes symmetrically arranged on both sides, and the second mating portion has screw holes symmetrically arranged on both sides. The first screw and the second screw pass through the through holes and are connected to the screw holes.

[0012] In a preferred embodiment, the extending directions of the through hole and the screw hole are perpendicular to the radial direction of the split fixing sleeve. The first mating portion is generally semi-circular, and a stepped portion is provided at the position where the through hole is provided. The nuts of the first screw and the second screw are respectively located on the stepped portion.

[0013] In a preferred embodiment, a variable diameter portion is formed on the inner side of the segmented fixing sleeve, and a shoulder portion is formed on the outer side of the circumferential limiting groove of the extension portion. The variable diameter portion is used to cooperate with the shoulder portion so that the outer end face of the segmented fixing sleeve is flush with the outer end face of the extension portion.

[0014] In a preferred embodiment, the adjusting member includes adjusting bolts, and the opening is a threaded hole; the number of adjusting bolts is 4-6.

[0015] In a preferred embodiment, the axial length of the extension portion located outside the outer end face is between 10 mm and 20 mm, and the width of the circumferential limiting groove is between 6 mm and 8 mm.

[0016] In a preferred embodiment, the second limiting part includes a blind hole, which forms a non-zero angle with the axial direction of the body component; the third limiting part is an oblique through hole extending in the same direction as the blind hole; the second limiting mechanism includes an anti-rotation member, which passes through the oblique through hole and extends into the blind hole.

[0017] In a preferred embodiment, the blind hole is a light hole, the oblique through hole is a light hole, and the anti-rotation component includes a screw or a pin.

[0018] A pump comprising any of the pump mechanical seals described above.

[0019] The technical solution of this utility model has the following significant beneficial effects:

[0020] This application improves the structure of the pump mechanical seal by adding an extension and a first limiting mechanism. The original inclined fixing device's connection and fixing function is eliminated, leaving only anti-rotation functionality. This achieves precise positioning (radial centering and axial positioning) and reliable fixing of the main body component on the pump casing, preventing misalignment during tightening and providing circumferential anti-rotation. This enhances the sealing performance, operational stability, and overall reliability of the mechanical seal, adapting to the actual operating conditions of fluid processing equipment such as centrifugal pumps. It solves the problems in the prior art where the integral sliding ring seal uses a single inclined screw for fastening, leading to uneven force on the main body component, easy misalignment, and consequently, the end cover failing to reach the intended installation position, decreased radial centering and axial positioning accuracy, poor sliding sealing surface fit, and insufficient sealing performance and operational stability.

[0021] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0022] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0023] Figure 1 This is a schematic diagram of the structure of a pump mechanical seal provided in the embodiments of this application;

[0024] Figure 2 This is a right view of a mechanical seal for a pump provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the structure of the body component in a pump mechanical seal provided in the embodiments of this application;

[0026] Figure 4 This is a schematic diagram of the structure of a split fixing sleeve in a pump mechanical seal provided in this application embodiment;

[0027] Figure 5 for Figure 4 Sectional view of AA.

[0028] The reference numerals in the above figures are as follows:

[0029] 1. Split-shaped fixing sleeve;

[0030] 10. Outer end face;

[0031] 11. First docking section;

[0032] 111. Through hole;

[0033] 112. Stepped section;

[0034] 12. Second docking section;

[0035] 121. Screw hole;

[0036] 13. Variable diameter section;

[0037] 14. Opening;

[0038] 16. Pump casing;

[0039] 2. Adjustment parts;

[0040] 3. Anti-rotation component;

[0041] 4. Circumferential limiting groove;

[0042] 40. Body components;

[0043] 401. Main body;

[0044] 402. Extension section;

[0045] 4021, Shoulder area;

[0046] 42. Compensation ring;

[0047] 5. Fasteners;

[0048] 50. Oblique through hole;

[0049] 52. Blind hole. Detailed Implementation

[0050] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are only for explaining the purpose of this utility model and should not be construed as limiting this utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, it can be a mechanical connection or an electrical connection, or it can be a connection within two elements, which can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0052] This utility model provides a mechanical seal for pumps and a pump thereof, which can achieve precise positioning and reliable fixation of the main body components on the pump housing, avoid misalignment during the tightening process, and at the same time achieve circumferential anti-rotation, thereby improving the sealing performance, operational stability and overall reliability of the mechanical seal.

[0053] Please refer to the following for comprehensive information. Figures 1 to 5 This application specification provides a mechanical seal for a pump. The pump includes a shaft and a pump housing 16. An annular gap is formed radially between the shaft and the pump housing 16. A portion of the mechanical seal is installed within the annular gap. The mechanical seal includes a body component 40, which comprises a main body portion 401 and an extension portion 402. The main body portion 401 is installed within the annular gap, and the extension portion 402 extends from the main body portion 401 toward the outer end face of the pump housing 16. The extension portion 402 is provided with a first limiting portion located outside the outer end face 10, and the main body portion 401 is provided with a second limiting portion; a first limiting mechanism, which cooperates with the first limiting portion to apply an axial force against the pump housing 16 to the main body component 40; and a second limiting mechanism, which cooperates with the second and third limiting portions to apply a circumferential anti-rotation force to the main body component 40, and is provided with a third limiting portion on the pump housing 16.

[0054] In this embodiment, the structure of the main body component 40 of the pump mechanical seal is improved by setting an extension portion 402 and a first limiting mechanism on the extension portion 402. At the same time, the connection and fixing function of the original inclined fixing device is eliminated, so that it only realizes the anti-rotation function. This achieves precise positioning (radial centering and axial positioning) and reliable fixing of the main body component 40 on the pump housing 16, avoids skewing during the tightening process, and realizes circumferential anti-rotation. This can improve the sealing performance, operational stability and overall reliability of the mechanical seal, adapt to the actual working conditions of fluid processing equipment such as centrifugal pumps, and solve the problems in the prior art where the integral sliding ring seal is tightened with a single inclined screw, resulting in uneven force on the main body component 40, easy skewing, and thus the end cover cannot reach the predetermined installation position, the radial centering accuracy and axial positioning accuracy decrease, the sliding sealing surface fit is poor, and the sealing performance and operational stability are insufficient.

[0055] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0056] In this embodiment, the pump mechanical seal is mainly used in a pump. The pump may include a shaft and a pump housing 16, etc., with an annular gap formed radially between the shaft and the pump housing 16, and part of the pump mechanical seal is installed within the annular gap. In addition, a compensation ring 42 or other structure may be provided between the pump mechanical seal and the shaft.

[0057] like Figure 3 As shown, the mechanical seal for the pump may include a body component 40. The body component 40 may include a main body portion 401 and an extension portion 402.

[0058] The extension portion 402 extends from the main body portion 401 to the outer end face 10 of the pump housing 16, and a first limiting portion is provided on the outer side of the outer end face 10. The outer end face 10 of the pump housing 16 is cleverly used as a positioning reference, providing a reasonable point of action for the first limiting mechanism. There is no need to set an additional limiting structure inside the pump housing 16, which simplifies the design and ensures that the axial force can be directly and stably transmitted to the main body component 40.

[0059] Please refer to the following: Figure 2 , Figure 3 , Figure 4 In one embodiment, the first limiting part may include a circumferential limiting groove 4 disposed on the outer side wall of the extension portion 402. The first limiting mechanism includes: a segmented fixing sleeve 1, a fastener 5, and an adjusting member 2. The segmented fixing sleeve 1 is disposed in the circumferential limiting groove 4 and is circumferentially fastened by the fastener 5. The segmented fixing sleeve 1 is provided with a plurality of openings 14 at intervals along the circumferential direction. The adjusting member 2 passes through the openings 14 and can abut against the outer end face 10 of the pump housing 16.

[0060] In this embodiment, the extension portion 402 can be entirely annular. The outer diameter of the extension portion 402 can be adapted to the inner diameter of the pump housing 16 at the corresponding position. For example, the outer diameter of the extension portion 402 is slightly smaller than the inner diameter of the pump housing 16, and the two can be clearance-fitted. The inner diameter of the extension portion 402 is larger than the outer diameter of the corresponding shaft part, thereby preventing interference.

[0061] An annular circumferential limiting groove 4 can be provided on the outer wall of the extension portion 402. This circumferential limiting groove 4 is used to install the first limiting mechanism. Specifically, through the cooperation of the first limiting mechanism and the first limiting part, an axial force is applied to the main body component 40 and abuts against the pump housing 16, thereby achieving precise axial positioning of the main body component 40. On the one hand, the direction of the axial force is consistent with the installation direction of the main body component 40, and there will be no uneven radial component force. This fundamentally avoids the main body component 40 from being misaligned during the fastening process, ensuring that the sealing end cap can smoothly reach the predetermined installation position, and greatly improving the axial positioning accuracy of the main body component 40. On the other hand, the stable axial abutment force can ensure the stability of the fit between the main body component 40 and the pump housing 16, avoiding the decrease in the sealing surface fit due to axial movement during operation, and providing a basic guarantee for sealing performance. At the same time, this limiting method has a simple structure and is easy to operate, further reducing the manufacturing cost and assembly difficulty of the sealing component.

[0062] Specifically, the first limiting mechanism may include: a split fixing sleeve 1, a fastener 5, and an adjusting component 2.

[0063] The segmented fixing sleeve 1 adopts a segmented design, which can be directly fastened into the circumferential limiting groove 4. This not only matches the structure of the circumferential limiting groove 4, but also greatly simplifies the assembly process and improves assembly efficiency. The inner diameter of the segmented fixing sleeve 1 matches the outer diameter of the bottom of the circumferential limiting groove 4, and the outer diameter of the segmented fixing sleeve 1 is larger than the inner diameter of the outer end face 10 of the pump housing 16.

[0064] Fastener 5 achieves circumferential fastening of the split fixing sleeve 1, ensuring that the split fixing sleeve 1 forms a ring structure after being fastened (a certain gap can be reserved between two adjacent mating parts), which fits tightly with the circumferential limiting groove 4, preventing the split fixing sleeve 1 from loosening and ensuring the stable transmission of the force of the subsequent adjustment component 2.

[0065] Specifically, the split fixing sleeve 1 may include a first mating portion 11 and a second mating portion 12, and the fastener 5 includes a first screw and a second screw. The first mating portion 11 has through holes 111 symmetrically arranged on both sides, and the second mating portion 12 has screw holes 121 symmetrically arranged on both sides. The first screw and the second screw pass through the through holes 111 and are connected to the screw holes 121 respectively.

[0066] Wherein, the extending directions of the through hole 111 and the screw hole 121 are perpendicular to the radial direction of the split fixing sleeve 1, the first mating portion 11 is generally in the shape of a semi-circular ring, and a step portion 112 is provided at the position where the through hole 111 is provided, and the nuts of the first screw and the second screw are respectively located on the step portion 112.

[0067] When the extension direction of the through hole 111 and the screw hole 121 is perpendicular to the radial direction of the split fixing sleeve 1, the tightening force of the screw is distributed along the circumference of the split fixing sleeve 1 and is consistent with the snapping direction of the split fixing sleeve 1, which maximizes the tightening effect and avoids loosening or deformation caused by unreasonable screw force direction. At the same time, it avoids the screw occupying the radial space of the split fixing sleeve 1 and ensures the tight fit between the split fixing sleeve 1 and the circumferential limiting groove 4.

[0068] In this design, a stepped portion 112 is provided at the through hole 111, and the screw and nut are embedded in the stepped portion 112, preventing the nut from protruding from the surface of the split fixing sleeve 1, saving equipment space and improving structural compactness. At the same time, the stepped portion 112 plays a limiting role for the screw and nut, preventing the screw from rotating circumferentially during tightening and operation, further improving the reliability of tightening, avoiding the impact of screw loosening on the force transmission of the adjusting component 2, and ensuring the axial positioning accuracy of the main body component 40.

[0069] The split fixing sleeve 1 has multiple openings 14 spaced around its circumference. Adjusting parts 2 pass through these openings and abut against the outer end face 10 of the pump housing 16. The multiple adjusting parts 2 can apply axial abutment force evenly along the circumferential direction, further avoiding uneven force on the main body component 40 and improving axial positioning accuracy. At the same time, the axial position of the main body component 40 can be finely adjusted by adjusting the extension length of one or more adjusting parts 2, compensating for minor deviations during assembly, ensuring that the sealing end cap accurately reaches the predetermined installation position, and further optimizing the sealing surface fit.

[0070] Furthermore, a variable diameter portion 13 may be formed on the inner side of the segmented fixing sleeve 1. Due to the presence of the circumferential limiting groove 4 on the outer side of the extension portion 402, a shoulder portion 4021 is formed at its end. The variable diameter portion 13 is used to mate with the shoulder portion 4021. After the segmented fixing sleeve 1 is installed in the circumferential limiting groove 4, the outer end face of the segmented fixing sleeve 1 is flush with the outer end face of the extension portion 402.

[0071] In use, the variable diameter part 13 on the inner side of the split fixing sleeve 1 and the shoulder part 4021 at the end of the extension part 402 cooperate with each other to achieve precise radial positioning and circumferential positioning of the split fixing sleeve 1 and the extension part 402, effectively preventing radial movement, circumferential rotation or wobbling of the split fixing sleeve 1 during use, and ensuring the positioning accuracy and connection stability after assembly.

[0072] When the split fixing sleeve 1 is installed in the circumferential limiting groove 4, the first mating part 11 and the second mating part 12 can be fastened in the circumferential limiting groove 4 and then tightened by the first screw and the second screw. After the split fixing sleeve 1 is installed in the circumferential limiting groove 4, its outer end face is flush with the outer end face of the extension part 402, so that the overall shape of the assembled part is regular and without protrusions or depressions, avoiding assembly interference with surrounding parts (such as adjusting bolts), improving structural compactness and space utilization, and optimizing the overall appearance integrity of the part.

[0073] The coordinated cooperation of the circumferential limiting groove 4 with the variable diameter part 13 and the shoulder part 4021 not only provides a stable installation space for the split fixing sleeve 1, but also strengthens the assembly firmness through multi-part limiting cooperation, prevents the split fixing sleeve 1 from loosening and failing, and improves the overall structural reliability and service life.

[0074] Specifically, the adjusting component 2 may include adjusting bolts, and correspondingly, the opening 14 may be a threaded hole. The number of adjusting bolts is 4-6.

[0075] The threaded fit between the adjusting bolt and the threaded hole allows for precise adjustment of the bolt extension length. This results in higher adjustment accuracy and easier operation. It can also precisely fine-tune the axial position of the main body component 40, compensating for minor deviations during assembly, ensuring that the sealing end cap accurately reaches the predetermined installation position, and further improving the fit of the sliding sealing surface.

[0076] In one embodiment, the axial length H of the extension portion 402 located outside the outer end face 10 is between 10 mm and 20 mm, and the groove width B of the circumferential limiting groove 4 is between 6 mm and 8 mm.

[0077] In this embodiment, since the axial length H of the extension portion 402 needs to meet the installation requirements of the split fixing sleeve 1 and the reserved installation and operation space of the adjustment component 2, the axial length H of the extension portion 402 cannot be too small. Based on the current requirements for the installation of the split fixing sleeve 1 and the reserved installation and operation space of the adjustment component 2, the axial length H of the extension portion 402 is ≥ 10mm.

[0078] In addition, in order to adapt to the layout of the outer end face of the pump housing, prevent interference with other components of the pump, and avoid structural redundancy that would increase cost and weight, the axial length H of the extension 402 cannot be too large. Under the premise of meeting basic functions, the axial length H of the extension 402 is ≤20mm.

[0079] Overall, the axial length H of the extension 402 is controlled between 10mm and 20mm. This provides sufficient installation space for the circumferential limiting groove 4, ensuring that the split fixing sleeve 1 can be stably installed and function properly. It also avoids structural redundancy and excessive space occupation caused by an excessively long extension 402, thus balancing installation requirements and structural compactness. At the same time, this length ensures the structural strength of the extension 402, preventing it from deforming under the axial force of the adjusting part 2 and the vibration of the pump operation, thus ensuring positioning stability.

[0080] In this embodiment, the core function of the circumferential limiting groove 4 is to accommodate the segmented fixing sleeve 1 and provide circumferential positioning. The width of the circumferential limiting groove 4 matches the axial thickness of the segmented fixing sleeve 1, while reserving a certain assembly gap. Generally, the axial thickness requirement of the segmented fixing sleeve 1 is as follows: the segmented fixing sleeve 1 needs to have sufficient axial strength to transmit the axial force of the adjusting component 2. Specifically, the axial thickness of the segmented fixing sleeve 1 made of conventional carbon steel or stainless steel needs to be ≥5mm. Among them, when the width B of the circumferential limiting groove 4 is controlled between 6mm and 8mm, it can accurately match the thickness of the segmented fixing sleeve 1, ensuring that the segmented fixing sleeve 1 can be tightly embedded in the groove to achieve reliable circumferential and radial limiting, while avoiding the loosening of the segmented fixing sleeve 1 caused by an excessively wide groove and the assembly difficulty caused by an excessively narrow groove, thus improving the fitting accuracy between the segmented fixing sleeve 1 and the circumferential limiting groove 4.

[0081] In this embodiment, the main body 401 is provided with a second limiting part, which provides a matching point for the second limiting mechanism, realizes the circumferential limiting connection between the main body component 40 and the pump housing 16, provides a guarantee for the transmission of circumferential anti-rotation force, avoids relative rotation of the main body component 40, can prevent the sealing surface from being worn more severely, and extends the service life of the seal.

[0082] In one embodiment, the second limiting portion may include a blind hole 52, which forms a non-zero angle with the axial direction of the body component 40; the third limiting portion is an oblique through hole 50 extending in the same direction as the blind hole 52; the second limiting mechanism includes an anti-rotation member 3, which passes through the oblique through hole 50 and extends into the blind hole 52. Specifically, the blind hole 52 is a light hole, the oblique through hole 50 is a light hole, and the anti-rotation member 3 includes a screw or a pin.

[0083] The blind hole 52 forms a non-zero angle with the axis of the main body component 40 and extends in the same direction as the oblique through hole 50 of the pump housing 16, so that the anti-rotation component 3 can simultaneously pass through the oblique through hole 50 and extend into the blind hole 52, thereby restricting the circumferential rotational freedom of the main body component 40 by means of oblique fit.

[0084] The anti-rotation component 3, with its oblique through-hole 50 and extension into the blind hole 52, has a simple structure and is easy to assemble. It does not require complex connecting parts, which reduces manufacturing costs and assembly difficulty. At the same time, the tight fit between the anti-rotation component 3 and the blind hole 52 and oblique through-hole 50 can effectively resist vibration and torque during pump operation, prevent the main body component 40 from rotating synchronously with the pump shaft, prevent wear on the sealing surface, and extend the service life of the seal.

[0085] This application also provides a pump that includes the above-described mechanical seal for pumps. By providing the mechanical seal for pumps, the pump can achieve the technical effects achieved by the embodiments of the mechanical seal for pumps. For details, please refer to the specific description of the above embodiments, which will not be repeated here.

[0086] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute included by “may” is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The use of the disclosure “a” or “an” to describe an element, component, part, or step is not intended to exclude other elements, components, parts, or steps.

[0087] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from the others. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A mechanical seal for a pump, characterized by, The pump includes a shaft and a pump housing, with an annular gap formed radially between the shaft and the pump housing. The mechanical seal for the pump includes: The body component includes a main body portion and an extension portion. The main body portion is installed within the annular gap. The extension portion extends from the main body portion toward the outer end face of the pump housing. The extension portion has a first limiting portion located outside the outer end face. The main body portion has a second limiting portion. The first limiting mechanism, which cooperates with the first limiting part, applies an axial force against the pump housing to the main body component; The second limiting mechanism is provided on the pump housing with a third limiting part. The second limiting mechanism cooperates with the second limiting part and the third limiting part to apply a circumferential anti-rotation force to the main body component.

2. The mechanical seal for a pump as set forth in claim 1, wherein The first limiting part includes a circumferential limiting groove disposed on the outer side wall of the extension portion. The first limiting mechanism includes a segmented fixing sleeve, a fastener, and an adjusting member. The segmented fixing sleeve is disposed in the circumferential limiting groove and is circumferentially fastened by the fastener. The segmented fixing sleeve is provided with a plurality of openings spaced apart along the circumferential direction. The adjusting member passes through the openings and can abut against the outer end face of the pump housing.

3. The mechanical seal for a pump as set forth in claim 2, wherein The split fixing sleeve includes a first mating part and a second mating part, and the fastener includes a first screw and a second screw. The first mating part has through holes symmetrically arranged on both sides, and the second mating part has screw holes symmetrically arranged on both sides. The first screw and the second screw pass through the through holes and are connected to the screw holes.

4. The mechanical seal for a pump as set forth in claim 3, wherein The extension directions of the through hole and the screw hole are perpendicular to the radial direction of the split fixing sleeve. The first mating part is generally semi-circular. A stepped part is provided at the position where the through hole is set. The nuts of the first screw and the second screw are respectively located on the stepped part.

5. The mechanical seal for a pump as set forth in claim 2, wherein The inner side of the segmented fixing sleeve has a variable diameter portion, and the extension portion has a shoulder portion formed on the outer side of the circumferential limiting groove. The variable diameter portion is used to cooperate with the shoulder portion so that the outer end face of the segmented fixing sleeve is flush with the outer end face of the extension portion.

6. The mechanical seal for a pump as set forth in claim 2, wherein The adjusting component includes adjusting bolts, the opening is a threaded hole, and the number of adjusting bolts is 4-6.

7. The mechanical seal for a pump as set forth in claim 2, wherein The axial length of the extension portion located outside the outer end face is between 10 mm and 20 mm, and the width of the circumferential limiting groove is between 6 mm and 8 mm.

8. The mechanical seal for a pump as defined in claim 1, wherein The second limiting part includes a blind hole, and the blind hole forms a non-zero angle with the axial direction of the body component; The third limiting part is an oblique through hole extending in the same direction as the blind hole. The second limiting mechanism includes an anti-rotation member, which passes through the oblique through hole and extends into the blind hole.

9. The mechanical seal for a pump as set forth in claim 8, wherein The blind hole is a light hole, the oblique through hole is a light hole, and the anti-rotation component includes screws or pins.

10. A pump characterized by The pump includes the pump mechanical seal as described in any one of claims 1 to 9.

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