Direct-driven rotor oil pump applied to centrifugal air compressor

Abstract

The utility model relates to the technical field of rotor oil pumps, in particular to a direct-drive rotor oil pump applied to a centrifugal air compressor, which comprises a shell and an oil pump end cover, a cycloid gear pump is arranged in an oil pump cavity, and the cycloid gear pump consists of an oil pump inner rotor and an oil pump outer rotor which are eccentrically meshed in the oil pump; an oil pump end cover is fixed to the sealing surface of the shell, an inner sealing ring groove and an outer sealing ring groove are formed in the sealing surface, and an inner sealing ring and an outer sealing ring which correspond to each other in shape are installed in the inner sealing ring groove and the outer sealing ring groove. The utility model has the beneficial effects that relatively independent closed spaces are formed in the rotation process by virtue of the pair of eccentric meshed inner and outer rotors, and the volumes of the closed spaces are continuously changed along with the meshed rotation of the inner and outer rotors, so that a low-pressure area and a high-pressure area are formed; medium enters the low-pressure area from the pipeline through the oil distribution disc and is discharged from the high-pressure area, and then the oil suction and oil discharge processes of the pump are completed.

Description

Technical Field

[0001] The utility model relates to the technical field of rotor oil pumps, in particular to a direct-drive rotor oil pump applied to a centrifugal air compressor. Background Art

[0002] With the development of technology and the support of policies, the concept of energy conservation has taken root in people's hearts. New energy vehicles are increasingly developing towards the characteristics of energy saving, safety and high efficiency, and multi-functional integration. As an important part of the hydrogen fuel cell system, the air compressor undertakes the function of delivering sufficient oxygen.

[0003] For centrifugal air compressors, the motor has a high speed and large power. Therefore, the cooling and lubrication requirements of centrifugal air compressors are large. The currently common oil pumps are mainly external meshing gear pumps and plunger pumps. The external meshing gear pump transports oil by the continuous meshing rotation of a pair of gears. The plunger pump realizes the oil suction and discharge process through the reciprocating motion of the plunger in the plunger cavity. It requires a sufficient and stable lubricating oil circulation to ensure the heat transfer of high-speed rotating parts and reduce friction. The air compressor is mainly used in vehicle-mounted systems, while the external plunger oil pump and external meshing gear pump are too large in volume and have high noise, which are not suitable for automotive applications. Therefore, it is necessary to design a direct-drive oil pump built inside the air compressor to improve the oil pump efficiency and avoid oil leakage. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a direct-drive rotor oil pump applied to a centrifugal air compressor, which operates smoothly, has low noise and does not leak oil.

[0005] To solve the above technical problem, the technical solution adopted by the utility model is to provide a direct-drive oil pump applied to a centrifugal air compressor, including a housing and an oil pump end cover. An oil inlet pipeline and an oil outlet pipeline are processed inside the housing. The oil inlet pipeline and the oil outlet pipeline meet at the oil pump cavity in the housing and are separated in the middle.

[0006] A cycloidal gear pump is arranged in the oil pump cavity. The cycloidal gear pump is composed of an inner oil pump rotor and an outer oil pump rotor that are eccentrically meshed inside the oil pump. The rotating shaft of the centrifugal air compressor extends into the oil pump cavity. The inner oil pump rotor is pressed tightly on the rotating shaft, and the outer oil pump rotor is pressed tightly on the housing surface.

[0007] The oil pump end cover is fixed on the sealing surface of the housing. The sealing surface is provided with an inner sealing ring groove and an outer sealing ring groove, and inner sealing rings and outer sealing rings with corresponding shapes are installed in the inner sealing ring groove and the outer sealing ring groove.

[0008] Further, in the above direct-drive oil pump applied to a centrifugal air compressor, an oil seal is provided on one side of the housing facing the rotating shaft.

[0009] Further, in the direct-drive oil pump applied to the centrifugal air compressor, the sealing surface of the housing and the oil pump end cover are fixed together by screws.

[0010] Further, in the direct-drive oil pump applied to the centrifugal air compressor, the oil pump end cover is made of transparent acrylic material.

[0011] Further, in the direct-drive oil pump applied to the centrifugal air compressor, the number of teeth of the inner rotor and the outer rotor of the oil pump is different.

[0012] Further, in the direct-drive oil pump applied to the centrifugal air compressor, the inner rotor of the oil pump and the rotating shaft are fixed together and rotate in an interference fit manner.

[0013] Further, in the direct-drive oil pump applied to the centrifugal air compressor, the outer rotor of the oil pump is fixed at the oil pump cavity of the housing in a clearance fit manner.

[0014] Further, in the direct-drive oil pump applied to the centrifugal air compressor, the bottom surfaces of the inner seal ring groove and the outer seal ring groove are arc-shaped.

[0015] The beneficial effects of the present utility model are as follows: Compared with the prior art, the direct-drive oil pump applied to the centrifugal air compressor of the present utility model forms a relatively independent closed space during the rotation process by means of a pair of eccentrically meshing inner and outer rotors. As the inner and outer rotors mesh and rotate, the volume of each closed space continuously changes, thereby forming a low-pressure area and a high-pressure area. At the same time, the medium enters the low-pressure area from the pipeline through the oil distribution disk and is discharged from the high-pressure area, thereby completing the oil suction and oil discharge processes of the pump. The direct-drive oil pump of the present utility model has the advantages of compact size, simple structure, stable operation, low noise, and good high-speed performance. It also ensures the airtightness of the cavity through the oil pump cover plate and the seal ring, avoids oil leakage, has strong self-priming ability, stable transmission, and is suitable for high rotational speeds. Description of the Drawings

[0016] Figure 1 It is a side sectional view of the direct-drive oil pump applied to the centrifugal air compressor according to the specific embodiment of the present utility model;

[0017] Figure 2 It is a front view of the direct-drive oil pump applied to the centrifugal air compressor according to the specific embodiment of the present utility model;

[0018] Label Description:

[0019] 1. Housing; 2. Oil pump end cover; 3. Screw; 4. Outer seal ring; 5. Inner seal ring; 6. Outer rotor of the oil pump; 7. Rotating shaft; 8. Inner rotor of the oil pump; 9. Oil seal. Specific Embodiments

[0020] To describe in detail the technical content, achieved objectives and effects of the present utility model, the following is described in conjunction with the embodiments and with reference to the accompanying drawings.

[0021] Please refer to Figure 1 and Figure 2 , a direct drive oil pump applied to a centrifugal air compressor, comprising a housing 1 and an oil pump end cover 2. An oil inlet pipe and an oil outlet pipe are machined in the housing 1. The oil inlet pipe and the oil outlet pipe converge at the oil pump chamber in the housing 1 and are separated in the middle.

[0022] A cycloidal gear pump is provided in the oil pump chamber. The cycloidal gear pump is composed of an inner oil pump rotor 8 and an outer oil pump rotor 6 that are eccentrically meshed inside the oil pump. The rotating shaft 7 of the centrifugal air compressor extends into the oil pump chamber. The inner oil pump rotor 8 is pressed tightly on the rotating shaft 7, and the outer oil pump rotor 6 is pressed tightly on the surface of the housing 1.

[0023] The oil pump end cover 2 is fixed to the sealing surface of the housing 1. The sealing surface is provided with an inner sealing ring 5 groove and an outer sealing ring 4 groove. Inner sealing rings 5 and outer sealing rings 4 with corresponding shapes are installed in the inner sealing ring 5 groove and the outer sealing ring 4 groove.

[0024] The beneficial effects of the present utility model are as follows: Compared with the prior art, the direct drive oil pump applied to the centrifugal air compressor of the present utility model forms relatively independent enclosed spaces during the rotation process by means of a pair of eccentrically meshed inner and outer rotors. As the inner and outer rotors mesh and rotate, the volume of each enclosed space continuously changes, thereby forming a low-pressure area and a high-pressure area. At the same time, the medium enters the low-pressure area from the pipeline through the oil distribution disk and is discharged from the high-pressure area, thereby completing the oil suction and oil discharge processes of the pump. The direct drive oil pump of the present utility model has the advantages of compact size, simple structure, stable operation, low noise and good high-speed performance. It also ensures the airtightness of the cavity through the oil pump cover plate and the sealing ring, avoids oil leakage, has strong self-priming ability, stable transmission and is suitable for high rotational speeds.

[0025] Further, in the above-mentioned direct drive oil pump applied to a centrifugal air compressor, an oil seal 9 is provided on one side of the housing 1 facing the rotating shaft 7.

[0026] As described above, the oil seal 9 ensures that the oil at the inner oil pump rotor 8 and the outer oil pump rotor 6 does not leak from the direction of the rotating shaft 7.

[0027] Further, in the above-mentioned direct drive oil pump applied to a centrifugal air compressor, the sealing surface of the housing 1 and the oil pump end cover 2 are fixed together by screws 3.

[0028] Further, in the above-mentioned direct drive oil pump applied to a centrifugal air compressor, the oil pump end cover 2 is made of transparent acrylic material.

[0029] As described above, replacing the oil pump end cover 2 with transparent acrylic material facilitates observing whether the rotation direction is correct and recording the operation of the oil pump.

[0030] Furthermore, in the direct-drive oil pump applied to the centrifugal air compressor, the number of teeth of the inner rotor 8 and the outer rotor 6 of the oil pump is different.

[0031] Furthermore, in the direct-drive oil pump applied to the centrifugal air compressor, the inner rotor 8 of the oil pump and the rotating shaft 7 are fixed together and rotate in an interference fit manner.

[0032] Furthermore, in the direct-drive oil pump applied to the centrifugal air compressor, the outer rotor 6 of the oil pump is fixed at the oil pump cavity of the housing 1 in a clearance fit manner.

[0033] Furthermore, in the direct-drive oil pump applied to the centrifugal air compressor, the bottom surfaces of the inner seal ring 5 groove and the outer seal ring 4 groove are arc-shaped.

[0034] As described above, the seal ring grooves of the above shape improve the sealing effect and prevent leakage.

[0035] Embodiment 1

[0036] Please refer to Figure 1 and Figure 2 , this embodiment provides a direct-drive oil pump applied to a centrifugal air compressor, including a housing 1 and an oil pump end cover 2. An oil inlet pipeline and an oil outlet pipeline are processed in the housing 1. The oil inlet pipeline and the oil outlet pipeline intersect at the oil pump cavity in the housing 1 and are separated in the middle;

[0037] A cycloidal gear pump is provided in the oil pump cavity. The cycloidal gear pump is composed of an inner rotor 8 and an outer rotor 6 that are eccentrically meshed inside the oil pump. The rotating shaft 7 of the centrifugal air compressor extends into the oil pump cavity. The inner rotor 8 of the oil pump is pressed against the rotating shaft 7, and the outer rotor 6 of the oil pump is pressed against the surface of the housing 1. The number of teeth of the inner rotor 8 and the outer rotor 6 of the oil pump is different.

[0038] The oil pump end cover 2 is fixed to the sealing surface of the housing 1. The sealing surface is provided with an inner seal ring 5 groove and an outer seal ring 4 groove. Inner seal rings 5 and outer seal rings 4 with corresponding shapes are installed in the inner seal ring 5 groove and the outer seal ring 4 groove. The housing 1 is provided with an oil seal 9 on the side facing the rotating shaft 7.

[0039] The sealing surface of the housing 1 and the oil pump end cover 2 are fixed together by screws 3. The oil pump end cover 2 is made of transparent acrylic material.

[0040] The operating principle of the above direct-drive oil pump applied to a centrifugal air compressor:

[0041] The rotating shaft and the inner rotor of the oil pump are fixed by interference fit and rotate synchronously. The outer rotor of the oil pump is installed on the housing in a clearance fit manner, and the inner rotor and the outer rotor of the oil pump are internally meshed. When the rotating shaft rotates, it will drive the inner rotor of the oil pump to rotate synchronously. At this time, the outer rotor of the oil pump that is internally meshed with the inner rotor of the oil pump also starts to rotate. Because the number of teeth of the two rotors is different, the rotation angles of the inner rotor and the outer rotor of the oil pump at the same time are different. This causes the volume of the sealed space between the two rotors to change continuously. When the volume increases, a vacuum is generated to complete the oil suction process, and when the volume decreases, the oil is squeezed out to complete the oil discharge process. As the rotating shaft rotates continuously, the oil is continuously sucked in and discharged, realizing the continuous oil supply function of the oil pump.

[0042] The oil pump end cover is locked on the housing by screws. The inner seal ring and the outer seal ring are fixed in the grooves on the housing. The function of the inner seal ring and the outer seal ring is to prevent oil from leaking out during the operation of the oil pump. The oil pump end cover can be replaced with transparent acrylic material to observe whether the rotation direction is correct and record the operation of the oil pump. The function of the oil seal is to prevent the oil from leaking out from the side of the rotating shaft.

[0043] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A direct-drive oil pump for a centrifugal air compressor, characterized in that: It comprises a housing and an oil pump end cover, wherein the housing has an oil inlet pipeline and an oil outlet pipeline machined therein, the oil inlet pipeline and the oil outlet pipeline intersect at the oil pump cavity in the housing and are separated in the middle; A cycloid gear pump is provided in the oil pump cavity, and the cycloid gear pump is composed of an inner rotor and an outer rotor of the oil pump that are eccentrically meshed in the oil pump; the rotating shaft of the centrifugal air compressor extends into the oil pump cavity, the inner rotor of the oil pump is pressed against the rotating shaft, and the outer rotor of the oil pump is pressed against the surface of the housing; The sealing surface of the housing is used to fix the oil pump end cover. The sealing surface is provided with an inner sealing ring groove and an outer sealing ring groove. Inner sealing rings and outer sealing rings of corresponding shapes are installed in the inner sealing ring groove and the outer sealing ring groove.

2. The direct-drive oil pump for centrifugal air compressor according to claim 1, characterized in that: The housing is provided with an oil seal on one side facing the rotating shaft.

3. The direct-drive oil pump for centrifugal air compressor according to claim 1, characterized in that: The sealing surface of the housing is fixed to the oil pump end cover by screws.

4. The direct-drive oil pump for centrifugal air compressor according to claim 1, characterized in that: The oil pump end cover is made of transparent acrylic material.

5. The direct-drive oil pump for centrifugal air compressor according to claim 1, characterized in that: The oil pump inner rotor and the oil pump outer rotor have different numbers of teeth.

6. The direct-drive oil pump for centrifugal air compressor according to claim 1, characterized in that: The inner rotor of the oil pump and the rotating shaft are fixed together and rotated in an interference fit manner.

7. The direct-drive oil pump for centrifugal air compressor according to claim 1, characterized in that: The oil pump outer rotor is fixed at the oil pump cavity of the housing in a clearance fit manner.

8. The direct-drive oil pump for centrifugal air compressor according to claim 1, characterized in that: The bottom surfaces of the inner sealing ring groove and the outer sealing ring groove are arc-shaped.

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