Internal gear pump capable of preventing gear ring from being glued

Abstract

The utility model discloses an internal gear pump capable of preventing a gear ring from being glued, which comprises a shell, the shell comprises a cavity, an oil suction port and an oil outlet, a gear and the gear ring are rotatably arranged in the cavity, a crescent plate is arranged in the cavity, the crescent plate is positioned at a crescent gap between the gear and the gear ring, the crescent plate divides the gap into a low-pressure area, a high-pressure area and a transition area, and the low-pressure area, the high-pressure area and the transition area are arranged in the cavity. The cavity comprises an inner circumferential wall and two axial walls, the shell comprises a high-pressure cavity, a groove is formed in the inner circumferential wall of the cavity, the two ends of the groove correspond to the two circumferential directions of the inner circumferential wall of the cavity respectively, the groove is of a crescent structure and is provided with an arc-shaped inwards-concave bottom inner wall, and the depth of the groove is gradually decreased from the middle to the two ends. The groove is formed in the position corresponding to the high-pressure area of the cavity, an oil conveying channel is formed in the shell, and the oil conveying channel comprises an oil inlet end and an oil outlet end. The rotating speed of the gear pump during operation can be increased, and the heat dissipation capacity and the lubricating effect of the gear pump are improved.

Description

Technical Field

[0001] The utility model relates to an internal meshing gear pump which can prevent the gear ring from gluing. Background Art

[0002] An internal gear pump usually includes a gear and a gear ring. The pump housing includes a cavity for accommodating the gear and the gear ring. The gear and the gear ring mesh and rotate in the cavity. When the internal gear pump operates under low speed and high pressure conditions, the contact surface between the gear ring and the cavity is subjected to a large load, and wear and bonding are prone to occur, which will not only affect the normal operation of the pump and shorten its service life, but also increase vibration and noise during operation. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the utility model provides an internal gear pump which can prevent the contact surface between the gear ring and the housing cavity from being worn and glued.

[0004] The utility model discloses an internal meshing gear pump for preventing a gear ring from gluing, comprising a shell, the shell comprising a cavity, an oil suction port and an oil outlet connected to the cavity, a gear and a gear ring are rotatably arranged in the cavity, the outer teeth of the gear are meshed with the inner teeth of the gear ring, a crescent plate is arranged in the cavity, the gear and the gear ring are eccentrically meshed to form a crescent-shaped gap, the crescent plate is located at the gap, the crescent plate divides the gap circumferentially into a low-pressure zone connected to the oil suction port, a high-pressure zone connected to the oil outlet, and a transition zone connected between the low-pressure zone and the high-pressure zone, specifically, the gap is divided into three areas with the line between the two sides of the crescent plate and the axis of the gear as the boundary, the low-pressure zone is connected to the oil suction port, the high-pressure zone is connected to the oil outlet, and the transition zone is located in the middle, the cavity comprises a groove which cooperates with the outer circumferential wall of the gear ring The inner circumferential wall in contact with the gear ring and two axial walls that can limit the axial position of the gear ring, the shell includes a high-pressure chamber connected between the high-pressure area and the oil outlet, the high-pressure oil enters the high-pressure chamber from the high-pressure area and is then sent out from the oil outlet, the high-pressure chambers are distributed at the axial ends of the gear ring, the inner circumferential wall of the cavity is provided with a groove, the two ends of the groove are respectively arranged corresponding to the two circumferential directions of the inner circumferential wall of the cavity, the groove is a crescent-shaped structure, the groove has an arc-shaped concave bottom inner wall and two side walls in the corresponding width direction, the depth of the groove is gradually reduced from the middle toward the two ends along the circumferential direction, the groove is arranged at a position corresponding to the high-pressure area of ​​the cavity, the shell is provided with an oil delivery channel, the oil delivery channel includes an oil inlet end connected to the high-pressure chamber and an oil outlet end connected to the groove.

[0005] When the gear pump is working, the gear ring is driven to rotate by the gear, and the pressure oil enters the groove from the high-pressure chamber, providing lateral pressure to the gear ring, so that a gap is generated between the outer circumferential wall of the gear ring and the inner circumferential wall of the cavity, so that an oil film can be generated on the contact surface between the outer circumferential wall of the gear ring and the inner circumferential wall of the cavity, thereby solving the problem of wear and bonding between the outer circumferential wall of the gear ring and the inner circumferential wall of the cavity under high-pressure and low-speed conditions, and reducing noise during operation.

[0006] Furthermore, the oil delivery channel includes a narrow portion, and the narrow portion can play a role in limiting the pressure of the introduced oil.

[0007] Furthermore, the housing includes a pump body and an end cover, and the oil delivery channel is arranged on the pump body; or a part of the oil delivery channel is arranged on the pump body, and the other part is arranged on the end cover, the two parts of the oil delivery channel are connected at the junction of the pump body and the end cover, and an annular notch is arranged at the junction of the pump body and the end cover, and a sealing ring is arranged at the annular notch, and the sealing ring is pressed between the pump body and the end cover, which can improve the sealing of the connection between the two parts of the oil delivery channel and prevent oil leakage.

[0008] Furthermore, the width of the groove is less than or equal to the axial depth of the cavity, and the two axial walls of the cavity are respectively located on the pump body and the end cover, and at least one of the axial walls constitutes the side wall of the groove along the width direction, which facilitates the processing and forming of the groove.

[0009] Furthermore, the groove is arranged at a position corresponding to the transition zone of the cavity, so that the groove is arranged at positions corresponding to the high-pressure zone and the transition zone at the same time. The pressure oil in the groove can form a thrust on the gear ring, and the thrust can resist the thrust given to the gear ring by the oil in the high-pressure zone, and can increase the gap between the gear ring and the inner circumferential wall of the cavity, thereby improving the formation effect of the oil film. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the assembly of the gear and the gear ring of the embodiment of the utility model;

[0011] Figure 2 A partial cross-sectional view of an embodiment of the utility model;

[0012] Figure 3 This is a schematic diagram of the assembly of the gear ring of an embodiment of the utility model;

[0013] Figure 4 A schematic diagram of a groove according to a first embodiment of the present utility model;

[0014] Figure 5 A schematic diagram of a groove according to a second embodiment of the present utility model;

[0015] Figure 6 This is a schematic diagram of a groove of a third implementation mode of the present utility model. DETAILED DESCRIPTION

[0016] An internal gear pump for preventing the ring gear from gluing according to an embodiment of the utility model, such as Figure 1-4 As shown, it includes a shell, the shell includes an end cover 11 and a pump body 12 connected to each other, the shell includes a cavity 101, an oil suction port and an oil outlet connected to the cavity 101, a gear 21 and a gear ring 22 are rotatably arranged in the cavity 101, the outer teeth of the gear 21 and the inner teeth of the gear ring 22 are meshed, a crescent plate 13 is arranged in the cavity 101, and the gear 21 and the gear ring 22 are eccentrically meshed to form a crescent-shaped gap, and the eccentric meshing means that the outer diameter of the gear 21 is smaller than the inner diameter of the gear ring 22, and the gear 21 is in an eccentric position relative to the gear ring 22, and the crescent plate 13 is located at the gap, and the crescent plate 13 divides the gap into a low-pressure area 31 connected to the oil suction port, a high-pressure area 32 connected to the oil outlet, and a transition area 33 connected between the low-pressure area 31 and the high-pressure area 32. Specifically, the gap is divided into three areas based on the connection line between the two sides of the crescent plate 13 and the axis 0 of the gear 21 and the connection line between the axis 0 and the meshing part of the gear 21 and the gear ring 22. The low-pressure area 31 is connected to the oil suction port, the high-pressure area 32 is connected to the oil outlet, and the transition area 33 is located in the middle (such as Figure 1 As shown in the figure, the mold cavity 101 includes an inner circumferential wall 1011 that cooperates with the outer circumferential wall of the gear ring 22 and two axial walls 1012 that can limit the axial direction of the gear ring 22. The shell includes a high-pressure cavity 102 connected between the high-pressure area 32 and the oil outlet. The high-pressure oil enters the high-pressure cavity 102 from the high-pressure area 32 and is then sent out from the oil outlet. The high-pressure cavity 102 is distributed at both axial ends of the gear ring 22. The inner circumferential wall 1011 of the mold cavity 101 is provided with a groove 103. The two ends of the groove 103 are respectively arranged in two circumferential directions of the inner circumferential wall 1011 of the mold cavity. The groove 103 is a crescent-shaped structure, and the groove 103 has an arc shape. The concave bottom inner wall and two corresponding side walls in the width direction, the depth of the groove 103 is gradually reduced from the middle toward the two ends along the circumferential direction, and the groove 103 is at least set at a position corresponding to the high-pressure area 32 of the cavity 101. For example, the groove 103 can only be set at a position corresponding to the high-pressure area 32. In this embodiment, the groove 103 is set across the positions corresponding to the high-pressure area 32 and the transition area 33. The pressure oil in the groove 103 can form a thrust on the gear ring 22, and the thrust can resist the thrust given to the gear ring 22 by the oil in the high-pressure area 32, and can increase the gap between the gear ring 22 and the inner circumferential wall of the cavity 101, thereby improving the formation effect of the oil film.

[0017] The housing is provided with an oil delivery channel 14 , which includes an oil inlet end 141 connected to the high-pressure chamber 102 and an oil outlet end 142 connected to the groove 103 .

[0018] When the gear pump is working, the ring gear 22 is driven to rotate by the gear 21, and the pressure oil enters the groove 103 from the high-pressure chamber 102, and provides lateral pressure to the ring gear 22, so that a gap is generated between the outer wall of the ring gear 22 and the inner wall of the cavity 101, so that an oil film can be generated on the contact surface between the outer wall of the ring gear 22 and the inner wall of the cavity 101, thereby solving the problem of wear and adhesion between the outer wall of the ring gear 22 and the inner wall of the cavity 101 under high-pressure and low-speed conditions, and reducing noise during operation.

[0019] The oil delivery channel 14 includes a narrow portion 143 , and the narrow portion 143 can limit the pressure of the introduced oil.

[0020] like Figure 2 As shown, in this embodiment, the oil delivery channel 14 is arranged on the pump body 12 (refer to Figure 2 The oil delivery channel 14 is a solid line portion in the middle. In other embodiments, a portion of the oil delivery channel 14 is disposed on the pump body 12, and another portion is disposed on the end cover 11. The two portions of the oil delivery channel 14 are connected to form a whole when the end cover 11 and the pump body 12 are connected (refer to Figure 2 The oil delivery channel 14 is shown in the dotted line portion. The two parts of the oil delivery channel 14 are connected at the junction of the pump body 12 and the end cover 11. An annular notch is provided at the junction of the pump body 12 and the end cover 11. A sealing ring 4 is provided at the annular notch. The sealing ring 4 is pressed between the pump body 12 and the end cover 11, which can improve the sealing performance of the connection between the two parts of the oil delivery channel 14 and prevent oil from leaking from the connection between the end cover 11 and the pump body 12.

[0021] In this embodiment, if Figure 4 As shown, the width of the groove 103 is smaller than the axial depth of the cavity 101, one of the axial walls 1012 of the cavity 101 is located on the pump body 12 of the shell, and the other axial wall 1012 of the cavity 101 is located on the end cover 11 of the shell, one of the side walls of the groove 103 located on the pump body 12 is spaced a certain distance from the axial wall 1012 located on the pump body 12, and the other side wall of the groove 103 is arranged on the end cover 11.

[0022] In other embodiments, it may also be as follows Figure 5 As shown, both side walls of the groove 103 are located on the pump body 12 , and the axial wall 1012 located on the pump body 12 constitutes one of the side walls of the groove 103 .

[0023] In other embodiments, it may also be as follows Figure 6 As shown, the axial wall 1012 on the pump body 12 constitutes one of the side walls of the groove 103 , and the other side wall of the groove 103 is arranged on the end cover 11 . In this embodiment, the width of the groove 103 is the same as the axial depth of the cavity 101 .

[0024] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. An internal meshing gear pump for preventing the bonding of a gear ring, comprising a housing, the housing comprising a cavity, an oil suction port and an oil outlet connected to the cavity, a gear and a gear ring are rotatably arranged in the cavity, a crescent plate is arranged in the cavity, an eccentric meshing between the gear and the gear ring forms a crescent-shaped gap, the crescent plate is located at the gap, the crescent plate circumferentially divides the gap into a low-pressure area connected to the oil suction port, a high-pressure area connected to the oil outlet, and a transition area connected between the low-pressure area and the high-pressure area, the cavity comprises an inner circumferential wall in contact with the outer circumferential wall of the gear ring and two axial walls capable of limiting the axial position of the gear ring, the housing comprises a high-pressure cavity connected between the high-pressure area and the oil outlet, the high-pressure cavity is distributed at the axial ends of the gear ring, and is characterized in that: A groove is provided on the inner circumferential wall of the cavity, and the two ends of the groove are respectively arranged corresponding to the two circumferential directions of the inner circumferential wall of the cavity. The groove is a crescent-shaped structure, and the groove has an arc-shaped concave bottom inner wall. The depth of the groove is gradually reduced from the middle toward the two ends. The groove is set at a position corresponding to the high-pressure area of ​​the cavity. An oil delivery channel is provided on the shell, and the oil delivery channel includes an oil inlet end connected to the high-pressure chamber and an oil outlet end connected to the groove.

2. An internal gear pump for preventing ring gear from gluing according to claim 1, characterized in that: The oil delivery channel includes a narrow portion.

3. The internal gear pump for preventing the gear ring from gluing according to claim 1, characterized in that: The housing comprises a pump body and an end cover, and the oil delivery channel is arranged on the pump body; or a part of the oil delivery channel is arranged on the pump body, and the other part is arranged on the end cover, and the two parts of the oil delivery channel are connected at the junction of the pump body and the end cover, and an annular notch is arranged at the junction of the pump body and the end cover, and a sealing ring is arranged at the annular notch, and the sealing ring is pressed between the pump body and the end cover.

4. The internal gear pump for preventing the gear ring from gluing according to claim 3, characterized in that: The width of the groove is less than or equal to the axial depth of the cavity. The two axial walls of the cavity are respectively located on the pump body and the end cover, and at least one of the axial walls constitutes the side wall of the groove along the width direction.

5. The internal gear pump for preventing the gear ring from gluing according to claim 1, characterized in that: The groove is arranged at a position corresponding to the transition zone of the cavity.

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