Mechanical seal device for sanitary pumps

Abstract

The utility model discloses a sanitary pump is with mechanical sealing device, including static ring (1), static ring seat (2), moving ring (3), drive seat (4) and spring (5), from the medium access one end is equipped with static ring (1) in proper order, static ring seat (2), moving ring (3) and drive seat (4), and all are covered in the outer of rotating shaft (6), the first annular protruding (7) is equipped in the central hole of static ring seat (2), and the first end surface of static ring (1) is equipped with first spacing (8) between the end surface of first annular protruding (7) and adopts floating connection and seals two end surfaces in the middle simultaneously. The mechanical sealing device makes static ring and static ring seat adopt floating connection and realize sealing effect simultaneously, thereby providing radial elastic compensation, reducing the dependence on interference fit, reducing thermal stress.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, specifically a mechanical seal device for sanitary pumps. Background Technology

[0002] In mechanical seals, the stationary ring and its seat employ a fitted, tight-fit structure. This typically means the stationary ring is pressed into the seat, possibly using an interference fit or other methods to secure it tightly. The stationary ring and seat of a mechanical seal need to withstand certain pressure and temperature changes. Tight-fit structures can be difficult to install because interference fits require precise machining; otherwise, improper installation or damage to components may occur. Furthermore, differences in the thermal expansion coefficients of the materials can cause problems at high temperatures, such as thermal expansion leading to an overly tight or loose fit, affecting the sealing effect. Maintenance issues also arise. If the stationary ring and seat are tightly fitted, disassembly can be cumbersome, requiring specialized tools or greater force, and is prone to damaging parts during disassembly, increasing maintenance costs and time. Moreover, if the stationary ring is damaged, the entire assembly may need to be replaced, rather than just the stationary ring, resulting in higher costs. Stress concentration is also a concern. Interference fits generate significant stress in the contact area, especially under vibration or impact, potentially leading to material fatigue, cracks, or even fracture. This is particularly important to consider in dynamic sealing applications, as mechanical seals are typically in a rotating state, and vibration is common. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a mechanical seal device for sanitary pumps that enables the stationary ring and stationary ring seat to be connected by floating and simultaneously achieve a sealing function, thereby providing radial elastic compensation, reducing dependence on interference fit, and reducing thermal stress.

[0004] The technical solution of this utility model is to provide a mechanical seal device for a sanitary pump with the following structure, including a stationary ring, a stationary ring seat, a rotating ring, a drive seat, and a spring; the stationary ring, stationary ring seat, rotating ring, and drive seat are sequentially arranged from the end where the medium enters, and all are sleeved on the outside of the rotating shaft; the drive seat is circumferentially limited to the rotating shaft, the rotating ring is sleeved on the inner end of the drive seat and the two are axially movable, one end of the spring abuts against the first annular end face on the outer side wall of the drive seat, and the other end abuts against the second annular end face on the outer side wall of the rotating ring, the stationary ring is embedded in one end of the stationary ring seat, and the end face of the stationary ring seat protrudes out of the stationary ring seat and is tightly pressed against the end face of the rotating ring under the push of the spring to achieve dynamic sealing; the feature is that: a first annular protrusion is provided in the central hole of the stationary ring seat, a first gap is provided between the first end face of the stationary ring and the end face of the first annular protrusion, and a floating connection is adopted in the middle to seal both end faces simultaneously.

[0005] A second gap is provided between the outer wall of one section of the stationary ring and the inner wall of the stationary ring seat corresponding to the axial position, and a floating connection is used in the middle to seal both sides at the same time.

[0006] The outer wall of the middle section of the stationary ring is provided with a second annular protrusion, and a circumferential limiting structure is provided between the outer wall of the second annular protrusion and the inner wall of the stationary ring seat corresponding to the axial position.

[0007] The circumferential limiting structure means that the outer side of the second annular protrusion is provided with at least a first plane, and the inner wall of the stationary ring seat corresponding to the axial position of the plane is provided with at least a matching second plane.

[0008] The stationary ring seat has an end seal at one end facing the moving ring. The inner end face of the end seal is connected to the end face of the second annular protrusion by a floating connection, and both end faces are sealed at the same time.

[0009] The first gap between the first end face of the stationary ring and the end face of the first annular protrusion, and the floating connection in the middle, and the simultaneous sealing of the two end faces, means that a first sealing ring is provided between the first end face of the stationary ring and the end face of the first annular protrusion. The first sealing ring is an L-shaped sealing ring, which is used to seal the first end face of the stationary ring and the end face of the first annular protrusion, as well as the outer wall of one section of the stationary ring and the inner wall of the stationary ring seat corresponding to the axial position.

[0010] The floating connection between the inner end face of the end seal and the end face of the second annular protrusion, and the simultaneous sealing of both end faces, means that a second sealing ring is provided between the inner end face of the end seal and the end face of the second annular protrusion.

[0011] With the above structure, this utility model has the following advantages: 1. The cross-sectional shape (right angle or arc) and elastic material (such as rubber, fluororubber, PTFE, etc.) of the L-type sealing ring enable it to compensate for the small gaps or axial / radial deviations between the stationary ring and the stationary ring seat through elastic deformation.

[0012] 2. Under conditions of temperature fluctuation or vibration, the L-shaped sealing ring can absorb the difference in thermal expansion or mechanical vibration through elastic deformation, reducing the risk of leakage caused by uneven stress on the sealing surface.

[0013] 3. The cross-sectional design of the L-shaped sealing ring enables it to simultaneously provide radial sealing (fitting the outer wall of the stationary ring and the inner hole of the stationary ring seat) and axial sealing (fitting the end face of the stationary ring and the step of the stationary ring seat), forming a double sealing barrier.

[0014] 4. It eliminates the need for a high-precision interference fit between the stationary ring and the stationary ring seat. During installation, the L-shaped sealing ring only needs to be embedded into the groove of the stationary ring seat, reducing the dependence on machining accuracy.

[0015] 5. Elastic materials can mitigate the difference in material expansion caused by sudden temperature changes, preventing metal parts from failing due to thermal stress deformation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly of the mechanical seal device for a sanitary pump according to this utility model.

[0017] Figure 2 This is a schematic diagram of Embodiment 1 of the connection between the stationary ring and the stationary ring seat of this utility model.

[0018] Figure 3 for Figure 2 Enlarged schematic diagram of part A.

[0019] Figure 4 This is a schematic diagram of Embodiment 3 of the connection between the stationary ring and the stationary ring seat of this utility model.

[0020] Figure 5 This is a schematic diagram of Embodiment 4 of the connection between the stationary ring and the stationary ring seat of this utility model.

[0021] Figure 6 This is a schematic diagram of Embodiment 6 of the connection between the stationary ring and the stationary ring seat of this utility model.

[0022] Figure 7 This is a left-side view of the connection between the stationary ring and the stationary ring seat of this utility model.

[0023] As shown in the figure: 1. Stationary ring, 2. Stationary ring seat, 3. Moving ring, 4. Drive seat, 5. Spring, 6. Rotating shaft, 7. First annular protrusion, 8. First gap, 9. Second gap, 10. Second annular protrusion, 11. First plane, 12. Second plane, 13. End seal, 14. First sealing ring, 15. Second sealing ring. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1-7 As shown, this utility model discloses a mechanical seal device for a sanitary pump, comprising a stationary ring 1, a stationary ring seat 2, a rotating ring 3, a drive seat 4, and a spring 5. The stationary ring 1, stationary ring seat 2, rotating ring 3, and drive seat 4 are sequentially arranged from the end where the medium enters, and all are fitted around a rotating shaft 6. The drive seat 4 is circumferentially limited by the rotating shaft 6; when the rotating shaft 6 rotates, it simultaneously drives the drive seat 4 and the rotating ring 3 to rotate synchronously.

[0026] The moving ring 3 is fitted inside the drive seat 4 and the two move axially. One end of the spring 5 abuts against the first annular end face on the outer wall of the drive seat 4, and the other end abuts against the second annular end face on the outer wall of the moving ring 3. After the sealing end face of the moving ring 3 is worn, the spring 5 pushes the moving ring 3 closer to the stationary ring 1 for axial compensation.

[0027] The stationary ring 1 is embedded in one end of the stationary ring seat 2, and its end face extends out of the stationary ring seat 2 and is tightly pressed against one end face of the moving ring 3 under the push of the spring 5 to achieve a dynamic seal. This seal is a dynamic seal.

[0028] The stationary ring seat 2 has a first annular protrusion 7 in its central hole. The first end face of the stationary ring 1 and the end face of the first annular protrusion 7 are provided with a first gap 8 and are connected by a floating connection in the middle, while simultaneously sealing both end faces. The outer wall of one section of the stationary ring 1 is provided with a second gap 9 and is connected by a floating connection in the middle, while simultaneously sealing both sides.

[0029] like Figure 7 As shown, the outer wall of the middle section of the stationary ring 1 is provided with a second annular protrusion, and a circumferential limiting structure is provided between the outer wall of the second annular protrusion and the inner wall of the stationary ring seat 2 corresponding to the axial position. The circumferential limiting structure means that at least one first plane 11 is provided on the outer side of the second annular protrusion, and at least one matching second plane 12 is provided on the inner wall of the stationary ring seat 2 corresponding to the axial position of the plane 11. This structure achieves the function of preventing rotation.

[0030] The stationary ring seat 2 has an end seal 13 facing the rotating ring 3. The inner end face of the end seal 13 is floatingly connected to the end face of the second annular protrusion, simultaneously sealing both end faces. The end seal 13 is welded to the stationary ring seat 2. The floating connection between the inner end face of the end seal 13 and the end face of the second annular protrusion, simultaneously sealing both end faces, means that a second sealing ring 15 is provided between the inner end face of the end seal 13 and the end face of the second annular protrusion.

[0031] The first gap 8 between the first end face of the stationary ring 1 and the end face of the first annular protrusion 7, and the floating connection in the middle, and the simultaneous sealing of the two end faces, means that a first sealing ring 14 is provided between the first end face of the stationary ring 1 and the end face of the first annular protrusion 7. The first sealing ring 14 is an L-shaped sealing ring, which is used to seal the first end face of the stationary ring 1 and the end face of the first annular protrusion 7, as well as the outer wall of one section of the stationary ring 1 and the inner wall of the stationary ring seat 2 corresponding to the axial position.

[0032] Example 1 of a mechanical seal device for a sanitary pump according to this utility model: Figure 2 and Figure 3The aforementioned structure employs an L-shaped sealing ring and a flat washer. The left side of the stationary ring 1 uses an L-shaped sealing ring, while the right side uses a flat washer with an end seal 13, which is welded and fixed to the stationary ring seat 2. The outer side of the second annular protrusion has at least two circumferentially symmetrical first planes 11, and the inner wall of the stationary ring seat 2 has matching second planes 12. Each first plane 11 corresponds to one second plane 12.

[0033] Example 3 of the mechanical seal device for a sanitary pump of this utility model: Figure 4 As shown, an L-shaped sealing ring and an O-ring structure are adopted. The left side of the stationary ring 1 adopts an L-shaped sealing ring, and the right side adopts an O-ring with an end seal 13, which is welded and fixed to the stationary ring seat 2. The axial limit of the stationary ring 1 and the stationary ring seat 2 is achieved by pressing the end seal 13 together.

[0034] Example 4 of the mechanical seal device for a sanitary pump of this utility model: Figure 5 As shown, an L-shaped sealing ring is used on the left side of the stationary ring 1, and the right end face of the stationary ring 1 extends out of the stationary ring seat 2. At least two circumferentially symmetrical first planes 11 are provided on the outer side of the second annular protrusion, and a matching second plane 12 is provided on the inner wall of the stationary ring seat 2. Each first plane 11 is equipped with a corresponding second plane 12, so that the stationary ring 1 and the stationary ring seat 2 achieve a structure with anti-rotation.

[0035] Embodiment 6 of the mechanical seal device for sanitary pumps of this utility model: It adopts two O-ring structures. The left side of the stationary ring 1 adopts an O-ring structure, and the right side adopts an O-ring with an end seal 13 and is welded and fixed to the stationary ring seat 2. The axial limit of the stationary ring 1 and the stationary ring seat 2 is achieved by pressing the two together with the end seal 13.

Claims

1. A mechanical seal device for a sanitary pump, comprising a stationary ring (1), a stationary ring seat (2), a rotating ring (3), a drive seat (4), and a spring (5); the stationary ring (1), stationary ring seat (2), rotating ring (3), and drive seat (4) are sequentially arranged from the end where the medium enters, and are all sleeved on the outside of a rotating shaft (6); the drive seat (4) is circumferentially limited to the rotating shaft (6), the rotating ring (3) is sleeved on the inner end of the drive seat (4) and the two are axially movable, one end of the spring (5) abuts against the first annular end face on the outer side wall of the drive seat (4), and the other end abuts against the second annular end face on the outer side wall of the rotating ring (3), the stationary ring (1) is embedded in one end of the stationary ring seat (2), and the end face extends out of the stationary ring seat (2) and the end face of the rotating ring (3) is tightly pressed together under the push of the spring (5) to achieve dynamic sealing; characterized in that: The stationary ring seat (2) has a first annular protrusion (7) in the center hole. The first end face of the stationary ring (1) and the end face of the first annular protrusion (7) are provided with a first gap (8) and a floating connection is adopted in the middle to seal both end faces at the same time.

2. The mechanical seal device for a sanitary pump according to claim 1, characterized in that: A second gap (9) is provided between the outer wall of one section of the stationary ring (1) and the inner wall of the stationary ring seat (2) corresponding to the axial position, and a floating connection is adopted in the middle and the two sides are sealed at the same time.

3. The mechanical seal device for a sanitary pump according to claim 1, characterized in that: The outer wall of the middle section of the stationary ring (1) is provided with a second annular protrusion (10), and a circumferential limiting structure is provided between the outer wall of the second annular protrusion (10) and the inner wall of the stationary ring seat (2) corresponding to the axial position.

4. A mechanical seal device for a sanitary pump according to claim 3, characterized in that: The circumferential limiting structure means that the outer side of the second annular protrusion (10) is provided with at least a first plane (11), and the inner wall of the stationary ring seat (2) corresponding to the axial position of the first plane (11) is provided with at least a matching second plane (12).

5. A mechanical seal device for a sanitary pump according to claim 3, characterized in that: The stationary ring seat (2) is provided with an end seal (13) at one end facing the moving ring (3). The inner end face of the end seal (13) and the end face of the second annular protrusion (10) are connected by a floating connection and simultaneously seal both end faces.

6. A mechanical seal device for a sanitary pump according to claim 1, characterized in that: The first end face of the stationary ring (1) and the end face of the first annular protrusion (7) are provided with a first gap (8) and are connected by a floating connection in the middle. The two end faces are sealed at the same time. This means that a first sealing ring (14) is provided between the first end face of the stationary ring (1) and the end face of the first annular protrusion (7). The first sealing ring (14) is an L-shaped sealing ring, which is used to seal the first end face of the stationary ring (1) and the end face of the first annular protrusion (7), as well as the outer wall of one section of the stationary ring (1) and the inner wall of the stationary ring seat (2) corresponding to the axial position.

7. A mechanical seal device for a sanitary pump according to claim 5, characterized in that: The floating connection between the inner end face of the end seal (13) and the end face of the second annular protrusion (10) and the simultaneous sealing of both end faces means that a second sealing ring (15) is provided between the inner end face of the end seal (13) and the end face of the second annular protrusion (10).

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