A new structure pump shaft for fixing mechanical seal
By setting a shoulder on the pump shaft and interfering with the spring seat, the problem of limited installation of mechanical seal structures in compact spaces is solved, achieving stable sealing performance and high-quality assembly.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU NANPU FLUID MASCH CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-05-29
AI Technical Summary
Existing mechanical seal structures are limited in installation within compact spaces, and the iron sheet is prone to relative rotation with the shaft, affecting assembly quality and sealing performance.
A shoulder is provided on the pump shaft, and the spring seat is interference-fitted with the shoulder to prevent the spring seat from rotating with the shaft. The interference fit between the spring seat and the shoulder achieves a tight and fixed connection, which can meet the installation requirements of compact space and ensure that the elastic element is in a compressed state.
It improves the applicability and assembly quality of mechanical seals, ensures sealing performance, prevents the spring seat from rotating with the shaft, and stabilizes the installation of elastic elements and sealing parts.
Smart Images
Figure CN224301046U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pump shaft technology, and in particular to a novel pump shaft structure for fixing mechanical seals. Background Technology
[0002] A mechanical seal is a device that prevents fluid leakage by having at least one pair of end faces perpendicular to the axis of rotation, which, under the action of fluid pressure, the elastic force of the compensation mechanism, and the cooperation of auxiliary seals, maintain contact and relative sliding between the end faces.
[0003] In related technologies, mechanical seal structures often adopt the form of a smooth shaft mating with milled planes on both sides. The mechanical seal is fixed to the surface of the smooth shaft by a set screw on the spring seat. However, due to the size of the set screw, the thickness of the matching spring seat is limited, which cannot meet the installation requirements of a compact space. As an alternative, an iron sheet is used instead. However, the iron sheet is prone to relative rotation with the shaft. During the assembly process, the spring is in an uncompressed state and cannot reach the working state in advance, which affects the subsequent assembly quality and sealing performance. Utility Model Content
[0004] The main objective of this invention is to propose a new pump shaft structure for fixing mechanical seals, aiming to meet the installation requirements of compact spaces while ensuring the quality of the mechanical seal.
[0005] To achieve the above objectives, this utility model proposes a novel pump shaft structure for fixing mechanical seals, comprising:
[0006] A shaft body, wherein a shoulder is provided on the shaft body;
[0007] A spring seat is sleeved on the shaft shoulder, and the spring seat and the shaft shoulder are interference-fitted.
[0008] A sealing part is provided on the shaft body, and an elastic part is provided between the spring seat and the sealing part.
[0009] In one embodiment, the shaft includes a first shaft portion and a second shaft portion, and the opposite surfaces of the shaft shoulder are respectively connected to the first shaft portion and the second shaft portion, so that the shaft has a stepped structure;
[0010] The spring seat is connected to the shaft shoulder, the spring seat is in close contact with the first shaft portion, and the spring seat protrudes outward from the edge of the first shaft portion.
[0011] In one embodiment, the spring seat has a through hole extending through the spring seat, and the wall of the through hole is fitted to the outer surface of the shoulder.
[0012] In one embodiment, a first limiting portion is provided on the shoulder surface, and a second limiting portion is provided on the wall of the through hole. The first limiting portion and the second limiting portion cooperate to restrict the relative rotation of the spring seat and the shaft.
[0013] In one embodiment, the first limiting part is a first plane, the second limiting part is a second plane, and the first plane and the second plane are in contact.
[0014] In one embodiment, the surface of the second shaft portion is provided with a third plane, the third plane having the same orientation as the first plane.
[0015] In one embodiment, the third plane is connected to the first plane by an arc surface.
[0016] In one embodiment, the spring seat has a notch, and the outer side of the spring seat communicates with the inner wall of the through hole through the notch.
[0017] In one embodiment, the notch opens into the arcuate inner wall of the through hole.
[0018] In one embodiment, the edge of the spring seat is recessed inward toward the through hole to form an annular groove, and the annular groove is disposed toward the side of the first shaft portion.
[0019] In one embodiment, the elastic portion is partially embedded in the annular groove, and the elastic portion abuts against the sealing portion.
[0020] The technical solution of this utility model achieves a tight and fixed connection between the shaft and the spring seat by setting a shoulder on the shaft body and interfering with the spring seat. This avoids the possibility of mutual rotation between the spring seat and the shaft body, and eliminates the need to install the spring seat with a set screw. This allows the thickness of the spring seat to be adapted to the installation requirements of compact spaces, thereby improving the adaptability of the mechanical seal. Moreover, the interference fit between the spring seat and the shoulder ensures the stability of the spring seat during the installation of the elastic element and the sealing part, thus ensuring that the elastic element is in a compressed state and guaranteeing the subsequent assembly quality and sealing performance. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0022] Figure 1A schematic diagram of an embodiment of the novel pump shaft for fixing a mechanical seal provided by this utility model;
[0023] Figure 2 A schematic diagram of the shaft body in one embodiment of the novel pump shaft structure for fixing mechanical seal provided by this utility model;
[0024] Figure 3 A schematic diagram of the axial side of the spring seat in one embodiment of the new pump shaft structure for fixing the mechanical seal provided by this utility model;
[0025] Figure 4 A front view of a spring seat in an embodiment of a novel pump shaft structure for fixing a mechanical seal provided by this utility model;
[0026] Figure 5 for Figure 4 Sectional view at point AA.
[0027] Explanation of icon numbers:
[0028] 100. New structure pump shaft for fixing mechanical seal; 10. Shaft body; 11. First shaft part; 12. Shaft shoulder; 13. Second shaft part; 14. Third plane; 15. First plane; 16. Arc surface; 20. Spring seat; 21. Seat body; 22. Through hole; 23. Second plane; 24. Notch; 25. Annular groove.
[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0033] A mechanical seal is a device that prevents fluid leakage by having at least one pair of end faces perpendicular to the axis of rotation, which, under the action of fluid pressure, the elastic force of the compensation mechanism, and the cooperation of auxiliary seals, maintain contact and relative sliding between the end faces.
[0034] In related technologies, mechanical seal structures often adopt the form of a smooth shaft mating with milled planes on both sides. The mechanical seal is fixed to the surface of the smooth shaft by a set screw on the spring seat. However, due to the size of the set screw, the thickness of the matching spring seat is limited, which cannot meet the installation requirements of a compact space. As an alternative, an iron sheet is used instead. However, the iron sheet is prone to relative rotation with the shaft. During the assembly process, the spring is in an uncompressed state and cannot reach the working state in advance, which affects the subsequent assembly quality and sealing performance.
[0035] This invention proposes a novel pump shaft structure for fixing mechanical seals.
[0036] Please see Figure 1 In one embodiment of this utility model, the novel pump shaft structure for fixing the mechanical seal includes:
[0037] Shaft 10, wherein a shoulder 12 is provided on the shaft 10;
[0038] A spring seat 20 is sleeved on the shoulder 12, and the spring seat 20 and the shoulder 12 are interference-fitted.
[0039] A sealing part 30 is provided on the shaft 10, and an elastic part is provided between the spring seat 20 and the sealing part 30.
[0040] It is understood that the sealing part 30 includes a rotating ring and a stationary ring, both of which are sleeved on the shaft 10, and the rotating ring is connected to the stationary ring. The elastic element is connected between the rotating ring and the spring seat 20.
[0041] It is understood that the spring seat 20 is fixed on the shoulder 12 so that the elastic element can be in a compressed state when the sealing part 30 and the elastic element are installed, thereby facilitating most of the pre-operational states.
[0042] It should be noted that the elastic element is a spring.
[0043] The technical solution of this utility model achieves a tight and fixed connection between the shaft body 10 and the spring seat 20 by providing a shoulder 12 on the shaft body 10 and interfering with the shoulder 12. This avoids the possibility of mutual rotation between the spring seat 20 and the shaft body 10, and eliminates the need to install the spring seat 20 with a set screw. This allows the thickness of the spring seat 20 to be adapted to the installation requirements of compact spaces, improving the adaptability of the mechanical seal. Moreover, the interference fit between the spring seat 20 and the shoulder 12 ensures the stability of the spring seat 20 during the installation of the elastic element and the sealing part 30, thereby ensuring that the elastic element is in a compressed state and guaranteeing the subsequent assembly quality and sealing performance.
[0044] In one embodiment, the shaft 10 includes a first shaft portion 11 and a second shaft portion 13, and the opposite surfaces of the shoulder 12 are respectively connected to the first shaft portion 11 and the second shaft portion 13, so that the shaft 10 has a stepped structure;
[0045] The spring seat 20 is connected to the shoulder 12, the spring seat 20 is in close contact with the first shaft portion 11, and the spring seat 20 protrudes outward from the edge of the first shaft portion 11.
[0046] like Figure 2 As shown, the first shaft portion 11, the shoulder 12 and the second shaft portion 13 are sequentially connected to each other to form a stepped structure, thereby assembling the shaft 10 inside the pump.
[0047] It is understandable that, in order to facilitate the connection between the sealing part 30 and the elastic element on the shaft 10, the spring seat 20 and the shaft shoulder 12 are fixed by the interference fit between the spring seat 20 and the shaft shoulder 12. The fixed spring seat 20 ensures the stability of the pre-installation of the elastic element and the sealing part 30 on the shaft 10, and ensures the subsequent assembly quality.
[0048] In one embodiment, the spring seat 20 is provided with a through hole 22 that penetrates the spring seat 20, and the wall of the through hole 22 is attached to the outer surface of the shoulder 12.
[0049] like Figure 3 As shown, the spring seat 20 includes a seat body 21, and the through hole 22 provided in the seat body 21 passes through the spring seat 20.
[0050] It is understood that when the spring seat 20 is installed on the shaft 10, the second shaft portion 13 passes through the through hole 22, so that the spring seat 20 moves along the second shaft portion 13 until the spring seat 20 moves to the position of the shaft shoulder 12, thus completing the interference fit between the spring seat 20 and the shaft shoulder 12.
[0051] It should be noted that, in order to ensure the stability of the interference fit between the spring seat 20 and the shoulder 12, after the spring seat 20 and the shoulder 12 are connected, the wall of the through hole 22 is in close contact with the outer surface of the shoulder 12.
[0052] That is, the cross-sectional shape of the through hole 22 is the same as the cross-sectional shape of the shoulder 12, so as to ensure a tight connection between the spring seat 20 and the shoulder 12 when they are interference fit.
[0053] In one embodiment, a first limiting part is provided on the shoulder surface, and a second limiting part is provided on the wall of the through hole 22. The first limiting part and the second limiting part cooperate to restrict the relative rotation of the spring seat 20 and the shaft 10.
[0054] It is understood that by providing the first limiting part on the shoulder surface and the second limiting part on the wall of the through hole 22 that cooperates with the first limiting part, the shaft 10 cannot rotate within the through hole 22, thereby preventing the spring seat 20 from rotating relative to the shaft 10.
[0055] In one embodiment, the first limiting part is a protrusion or a recess, and the second limiting part is a recess or a protrusion, so that when the spring seat 20 is assembled on the shoulder 12, the protrusion and the recess can cooperate with each other to ensure that the spring seat 20 and the shaft 10 can rotate to a certain extent.
[0056] It should be noted that when the first limiting part is concave and the second limiting part is convex, the second shaft part 13 is provided with a groove that is the same as the concave part, and the groove extends along the extension direction of the second shaft part, so that when the spring seat 20 moves from the second shaft part 13 toward the shoulder 12, the protrusion on the spring seat 20 can move along the groove to ensure assembly.
[0057] It should be noted that when the recess is provided on the spring seat 20, the recess is provided along the extending direction of the through hole 22 so that the recess and the protrusion can be adapted during the movement of the spring seat 20.
[0058] Preferably, the first limiting part is a first plane 15, the second limiting part is a second plane 23, and the first plane 15 and the second plane 23 are in contact.
[0059] It should be noted that the shaft 10 is generally cylindrical, so the cross section of the shoulder 12 is also circular. Therefore, the inner wall contour of the through hole 22, which has the same outer contour as the shoulder, is also circular. Therefore, during the rotation of the shaft 10, the spring seat 20 will rotate relative to the shaft 10.
[0060] Therefore, a first plane 15 is provided on the shoulder, and a second plane 23 is provided on the wall of the through hole 22, with the first plane 15 and the second plane 23 connected at the junction.
[0061] It is understood that by setting the first plane 15 on the shoulder 12 and the second plane 23 on the wall of the through hole 22, the outer contour shape of the shoulder 12 and the contour shape of the wall of the through hole 22 are changed. In this way, the shoulder 12 is prevented from rotating in the through hole 22 by the close contact between the first plane 15 and the second plane 23.
[0062] In one embodiment, the shoulder 12 is provided with a plurality of first planes 15, and the through hole 22 is provided with a plurality of second planes 23. The first planes 15 and the second planes 23 are in corresponding contact and connection, thereby preventing the spring seat 20 from rotating relative to the shaft 10.
[0063] In one embodiment, the surface of the second shaft portion 13 is provided with a third plane 14, the third plane 14 having the same orientation as the first plane 15.
[0064] It is understood that the second plane 23 is disposed on the hole wall of the through hole 22, and the third plane 14 is disposed on the surface of the second shaft 13 in order to ensure that the spring seat moves smoothly on the second shaft 13.
[0065] When the second shaft portion 13 passes through the spring seat 20, the second plane 23 is arranged parallel to the third plane 14, thereby ensuring that the spring seat 20 moves smoothly on the second shaft portion 13.
[0066] In one embodiment, the third plane 14 is connected to the first plane 15 by an arc surface 16.
[0067] Since the shoulder 12 and the second shaft portion 13 are stepped, when the spring seat 20 moves from the second shaft portion 13 to the shoulder 12, the position of the spring seat 20 needs to be adjusted in order to stably achieve the engagement with the shoulder 12.
[0068] Therefore, the transition between the shoulder 12 and the second shaft portion 13 is achieved through the arc surface 16. When the spring seat 20 moves from the second shaft portion 13 toward the shoulder 12, there is no need to adjust the movement of the spring seat 20. It can move quickly onto the shoulder 12 directly along the arc surface 16, thereby improving the assembly efficiency and quality of the spring seat 20.
[0069] In one embodiment, the spring seat 20 is provided with a notch 24, and the outer side of the spring seat 20 is connected to the inner wall of the through hole 22 through the notch 24.
[0070] It should be noted that when it is necessary to remove the spring seat 20 from the shoulder 12, the spring seat 20 is not easy to remove from the shoulder 12 because the spring seat 20 is interference-fitted with the shoulder 12.
[0071] Therefore, a notch 24 is provided on the spring seat 20. When it is necessary to remove the spring seat 20 from the shoulder 12, an external object can be inserted into the notch 24 to open the notch 24, thereby contacting the interference fit between the spring seat 20 and the shoulder 12, thus facilitating the removal of the spring seat 20.
[0072] Meanwhile, when installing the spring seat 20, the notch 24 provides deformation space for the spring seat 20 during interference fit, thus ensuring the smooth progress of the interference fit.
[0073] In one embodiment, such as Figure 4 and Figure 5 The notch 24 opens into the arc-shaped inner wall of the through hole 22.
[0074] It is understandable that when the arc-shaped inner wall of the through hole 22 is open, when the spring seat 20 needs to be removed from the shoulder 12, and a foreign object extends into the notch 24 and pries open the notch 24, the inner wall of the through hole 22 opposite to the notch 24 is not the second plane 23.
[0075] It is understood that the second plane 23 will not deform due to the opening of the notch 24, thereby ensuring that when the spring seat 20 is connected to the shoulder 12, the second plane 23 and the first plane 15 are tightly fitted with an interference fit.
[0076] In one embodiment, the edge of the spring seat 20 is recessed inward toward the through hole 22 to form an annular groove 25, and the annular groove 25 is disposed toward the side of the first shaft portion 11.
[0077] In one embodiment, the elastic portion is partially embedded in the annular groove 25, and the elastic portion abuts against the sealing portion 30.
[0078] It is understood that by providing the annular groove 25 on the side of the spring seat 20 facing the sealing part 30, a workpiece is provided for the elastic part to abut against the spring seat 20. The stability of the abutment between the elastic part and the spring seat 20 is ensured by the elastic part being partially embedded in the annular groove 25.
[0079] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A novel pump shaft structure for fixing a mechanical seal, characterized in that, include: A shaft body, wherein a shoulder is provided on the shaft body; A spring seat is sleeved on the shaft shoulder, and the spring seat and the shaft shoulder are interference-fitted. A sealing part is provided on the shaft body, and an elastic part is provided between the spring seat and the sealing part.
2. The novel pump shaft structure for fixing a mechanical seal as described in claim 1, characterized in that, The shaft body includes a first shaft portion and a second shaft portion, and the opposite surfaces of the shaft shoulder are respectively connected to the first shaft portion and the second shaft portion, so that the shaft body has a stepped structure; The spring seat is connected to the shaft shoulder, the spring seat is in close contact with the first shaft portion, and the spring seat protrudes outward from the edge of the first shaft portion.
3. The novel pump shaft structure for fixing a mechanical seal as described in claim 2, characterized in that, The spring seat has a through hole that passes through the spring seat, and the wall of the through hole fits against the outer surface of the shoulder.
4. The novel pump shaft structure for fixing a mechanical seal as described in claim 3, characterized in that, A first limiting part is provided on the shoulder surface, and a second limiting part is provided on the wall of the through hole. The first limiting part and the second limiting part cooperate to restrict the relative rotation of the spring seat and the shaft.
5. The novel pump shaft structure for fixing a mechanical seal as described in claim 4, characterized in that, The first limiting part is a first plane, the second limiting part is a second plane, and the first plane and the second plane are in contact.
6. The novel pump shaft structure for fixing a mechanical seal as described in claim 5, characterized in that, The second shaft surface is provided with a third plane, and the third plane is oriented in the same direction as the first plane.
7. The novel pump shaft structure for fixing a mechanical seal as described in claim 6, characterized in that, The third plane is connected to the first plane by an arc surface.
8. The novel pump shaft structure for fixing a mechanical seal as described in any one of claims 1 to 7, characterized in that, The spring seat has a notch, and the outer side of the spring seat is connected to the inner wall of the through hole through the notch.
9. The novel pump shaft structure for fixing a mechanical seal as described in claim 8, characterized in that, The notch opens into the arc-shaped inner wall of the through hole.
10. The novel pump shaft structure for fixing a mechanical seal as described in claim 8, characterized in that, The edge of the spring seat is recessed inward toward the through hole to form an annular groove, and the annular groove is disposed toward the side of the first shaft portion.