A seal assembly for a pump and an oil pump

Abstract

The utility model relates to the field of sealing assembly, especially pump sealing assembly and oil pump for the isolation of first medium and second medium, including the relative rotation of dynamic ring and static ring, and the cooperation of dynamic ring and static ring is provided with the sealing ring, dynamic ring and static ring are adjacent to each other two wall surfaces around the self axis respectively and are provided with the coaxial first sealing groove and second sealing groove, dynamic ring and static ring are relatively movable along the axial direction cooperation, and have a relative position to make first sealing groove and second sealing groove opening relative, form the closed chamber, the sealing ring fills in the chamber and is provided, two ends of sealing ring respectively with first sealing groove and second sealing groove abut, make the relative displacement of dynamic ring and static ring along the axial direction be limited.

Description

Technical Field

[0001] This utility model relates to the field of sealing components, and in particular to a sealing component for pumps and an oil pump. Background Technology

[0002] In pumps, sealing components are used to prevent leakage of working media such as oil and water. Traditional mechanical seals for pumps mainly rely on an extremely thin liquid film formed between the end faces of the rotating and stationary rings to achieve a seal. However, in actual operating conditions, especially when there are pressure fluctuations or shaft movement, it is difficult to maintain a stable axial clearance between the rotating and stationary rings. If the clearance is too small, the end faces will come into direct contact, resulting in severe wear; if the clearance is too large, the liquid film will be difficult to form or the sealing effect will decrease, leading to media leakage. Utility Model Content

[0003] The purpose of this invention is to provide a pump sealing assembly and an oil pump to solve the problem of difficulty in ensuring the axial clearance between the dynamic ring and the stationary ring in the prior art.

[0004] The technical solution of this utility model is: a pump sealing assembly for isolating a first medium from a second medium; comprising a rotating ring and a stationary ring, wherein a sealing ring is provided between the rotating ring and the stationary ring; The two adjacent walls of the moving ring and the stationary ring are respectively provided with a coaxial first sealing groove and a second sealing groove around their own axis. The moving ring and the stationary ring are axially movable and have a relative position such that the openings of the first sealing groove and the second sealing groove are opposite each other, forming a closed chamber. The sealing ring is filled in the cavity, and its two ends abut against the first sealing groove and the second sealing groove, respectively, so that the relative displacement between the moving ring and the stationary ring along the axial direction is restricted.

[0005] Preferably, a receiving groove is formed on one end face of the moving ring, the receiving groove having a depth direction parallel to the axis; a stop portion extending into the receiving groove is provided on the stationary ring along the axial direction, and a space for oil film formation is formed between the stop portion and the wall surface parallel to the receiving groove.

[0006] Preferably, the inner wall of the stationary ring is provided with a third sealing groove around its own axis, and multiple third sealing grooves are provided along the axial direction, forming a labyrinth structure.

[0007] Preferably, the stationary ring is provided with a first drain hole and a second drain hole; One end of the first vent hole is located on the end face of the stationary ring away from the rotating ring and is connected to the first medium. The other end of the first vent hole passes through the second sealing groove in a direction parallel to the axis. The second vent hole is arranged radially and its two ends are connected to the second medium and the second sealing groove, respectively.

[0008] An oil pump includes a main shaft with a bearing chamber fixed on it. A bearing coaxial with the main shaft is installed inside the bearing chamber. An opening is formed between the end of the bearing chamber and the outer wall of the main shaft. A sealing assembly is sleeved on the main shaft and disposed in the opening.

[0009] Compared with the prior art, the advantages of this utility model are: (1) By filling the first and second sealing grooves that are fitted on the rotating and stationary rings, the sealing ring can control the axial distance between the rotating and stationary rings. When the rotating ring tends to move away from the stationary ring, the two end faces of the sealing ring are abutted by the side walls of the two sealing grooves, thereby effectively preventing the gap from expanding and ensuring that the axial gap between the rotating and stationary rings can always maintain a stable lubricating oil film within a preset range. This avoids dry friction wear caused by too small a gap and also prevents seal failure caused by too large a gap, greatly improving the reliability and service life of the seal.

[0010] (2) The rotating ring, stationary ring and sealing ring can be disassembled, so that when assembling the oil pump, the rotating ring, stationary ring and sealing ring can be assembled into a sealing component, and then the sealing component can be installed as a whole on the main shaft of the oil pump, thereby reducing the assembly difficulty. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a first-view exploded view of a pump sealing assembly according to the present invention; Figure 2 This is a second-view exploded view of a pump sealing assembly according to the present invention; Figure 3 This is a cross-sectional view of a pump sealing assembly according to the present invention; Figure 4 This is a structural diagram of the oil pump described in this utility model; Wherein: 1. Dynamic ring, 11. First sealing groove, 12. Receiving groove, 2. Stationary ring, 21. Second sealing groove, 22. Third sealing groove, 23. Stop part, 24. First vent hole, 25. Second vent hole, 100. Sealing assembly, 200. Main shaft, 300. Bearing chamber, 400. Bearing. Detailed Implementation

[0012] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0013] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0014] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0015] The present invention will be further described in detail below with reference to specific embodiments: like Figures 1-3 As shown, a pump sealing assembly 100 is used to isolate a first medium and a second medium, including a rotating ring 1 and a stationary ring 2 that rotate relative to each other, with a sealing ring fitted between the rotating ring 1 and the stationary ring 2.

[0016] A first sealing groove 11 is formed on the outer wall surface of the rotating ring 1 near the stationary ring 2 around its own axis, and a second sealing groove 21 is formed on the inner wall surface of the stationary ring 2 near the rotating ring 1 around its own axis. Furthermore, the rotating ring 1 and the stationary ring 2 are axially movable relative to each other, and there is a relative position between the rotating ring 1 and the stationary ring 2 such that the openings of the first sealing groove 11 and the second sealing groove 21 are opposite each other, forming a closed annular cavity.

[0017] The sealing ring is filled in the cavity. When the moving ring 1 tends to move away from the stationary ring 2, the second sealing groove 21 on the moving ring 1 will abut against the left end face of the sealing ring, while the first sealing groove 11 on the stationary ring 2 will abut against the right end face of the sealing ring. This allows the sealing ring to prevent the moving ring 1 from moving away from the stationary ring 2, thereby controlling the axial gap between the moving ring 1 and the stationary ring 2 to maintain a preset gap, which is beneficial for the formation of an oil film.

[0018] A receiving groove 12 is formed on one end face of the rotating ring 1, and the depth direction of the receiving groove 12 is parallel to the axis. A stop part 23 is provided on the stationary ring 2, protruding parallel to the axis. The stop part 23 is inserted and engaged with the receiving groove 12, so that the outer wall of the stop part 23 and the inner wall of the receiving groove 12 form an additional axial mating surface. Furthermore, under the control of the mating distance between the stationary ring 2 and the rotating ring 1 by the sealing ring, a longer oil film can be generated on the additional mating surface, thereby achieving a better sealing effect.

[0019] Furthermore, a third sealing groove 22 is formed on the inner wall of the stationary ring 2 around its own axis. Multiple third sealing grooves 22 are arranged axially, forming a labyrinth structure for sealing. In this embodiment, two third sealing grooves 22 are provided on the stationary ring 2 along the axial direction.

[0020] The stationary ring 2 is provided with a first vent 24 and a second vent 25. When the pressure in the space containing the first or second medium is too high, the first or second medium can be allowed to flow out through the channel formed by the first vent 24 and the second vent 25, thereby reducing the pressure. Specifically, one end of the first vent 24 is located on the end face of the stationary ring 2 away from the moving ring 1 and is connected to the first medium. The other end of the first vent 24 passes through the second sealing groove 21 in a direction parallel to the axis. The second vent 25 is arranged radially, with both ends connected to the second medium and the second sealing groove 21, respectively.

[0021] like Figure 4 As shown, this application also provides an oil pump, which employs a pump sealing assembly 100 as described above, including a main shaft 200, a bearing chamber 300 fixed on the main shaft 200, a bearing 400 coaxial with the main shaft 200 installed inside the bearing chamber 300, an opening being formed between the end of the bearing chamber 300 and the outer wall of the main shaft 200, and the sealing assembly 100 being sleeved on the main shaft 200 and disposed in the opening.

[0022] 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. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A pump sealing assembly (100) for isolating a first medium from a second medium; characterized in that, It includes a rotating ring (1) and a stationary ring (2) that rotate relative to each other, and a sealing ring is provided between the rotating ring (1) and the stationary ring (2); The moving ring (1) and the stationary ring (2) have coaxial first sealing grooves (11) and second sealing grooves (21) respectively on their two adjacent wall surfaces around their own axes. The moving ring (1) and the stationary ring (2) are axially movable relative to each other and have a relative position such that the openings of the first sealing groove (11) and the second sealing groove (21) are opposite to each other, forming a closed chamber; The sealing ring is filled in the cavity, and the two ends of the sealing ring abut against the first sealing groove (11) and the second sealing groove (21) respectively, so that the relative displacement between the moving ring (1) and the stationary ring (2) along the axial direction is restricted.

2. The pump sealing assembly (100) according to claim 1, characterized in that, A receiving groove (12) is provided on one end face of the moving ring (1), and the receiving groove (12) has a depth direction parallel to the axis; a stop part (23) extending into the receiving groove (12) is provided on the stationary ring (2) along the axial direction, and a space for oil film formation is formed between the stop part (23) and the wall surface parallel to the receiving groove (12).

3. A pump sealing assembly (100) according to claim 2, characterized in that, The inner wall of the stationary ring (2) is provided with a third sealing groove (22) around its own axis. The third sealing groove (22) is provided in multiple ways along the axial direction, and the multiple third sealing grooves (22) form a labyrinth structure.

4. A pump sealing assembly (100) according to claim 3, characterized in that, The stationary ring (2) is provided with a first drain hole (24) and a second drain hole (25); One end of the first drain hole (24) is opened on the end face of the stationary ring (2) away from the moving ring (1) and is connected to the first medium. The other end of the first drain hole (24) passes through the second sealing groove (21) in a direction parallel to the axis. The second drain hole (25) is arranged radially, and its two ends are connected to the second medium and the second sealing groove (21) respectively.

5. An oil pump employing a pump sealing assembly (100) as described in claim 4, characterized in that, Includes a spindle (200), on which a bearing chamber (300) is fixed, and a bearing (400) coaxial with the spindle (200) is installed inside the bearing chamber (300). An opening is formed between the end of the bearing chamber (300) and the outer wall of the spindle (200), and a sealing assembly (100) is sleeved on the spindle (200) and disposed in the opening.

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