CN113757111A - Internal gear pump - Google Patents

Internal gear pump Download PDF

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Publication number
CN113757111A
CN113757111A CN202111146833.5A CN202111146833A CN113757111A CN 113757111 A CN113757111 A CN 113757111A CN 202111146833 A CN202111146833 A CN 202111146833A CN 113757111 A CN113757111 A CN 113757111A
Authority
CN
China
Prior art keywords
oil
gear
pressure
end cover
ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111146833.5A
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Chinese (zh)
Inventor
陈义耀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangzhou Winmost Precision Machinery Co ltd
Original Assignee
Guangzhou Winmost Precision Machinery Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangzhou Winmost Precision Machinery Co ltd filed Critical Guangzhou Winmost Precision Machinery Co ltd
Priority to CN202111146833.5A priority Critical patent/CN113757111A/en
Publication of CN113757111A publication Critical patent/CN113757111A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • F04C13/002—Pumps for particular liquids for homogeneous viscous liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/101—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with a crescent-shaped filler element, located between the inner and outer intermeshing members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N13/00—Lubricating-pumps
    • F16N13/20—Rotary pumps

Abstract

The invention provides an internal gear pump, which belongs to the technical field of gear pumps and comprises: the pump body, the first end cover and the second end cover jointly define an inner cavity; the inner gear ring is arranged in the inner cavity chamber; the rotating shaft is arranged in the inner gear ring, an outer gear is arranged on the rotating shaft, and the outer gear and the inner gear ring are eccentrically arranged and are mutually meshed; the pressure retainer assembly divides a space between the inner gear ring and the outer gear into a high-pressure oil cavity and a low-pressure oil cavity; the two pressure plates are used for sealing a space between the inner gear ring and the outer gear, wherein the first end cover is provided with an oil inlet, an oil inlet flow passage is communicated with the oil inlet and the low-pressure oil cavity, the first end cover or the second end cover is provided with an oil outlet, the pressure plate adjacent to the oil outlet is provided with an oil passing hole, and an oil outlet flow passage penetrates through the oil passing hole to be communicated with the oil outlet and the high-pressure oil cavity. According to the internal gear pump provided by the embodiment of the invention, liquid enters from the side edge of the inner cavity when entering and exiting the inner cavity in the pump body, so that the generation of turbulent flow can be reduced when the inner gear ring rotates.

Description

Internal gear pump
Technical Field
The invention relates to the technical field of gear pumps, in particular to an internal gear pump.
Background
The existing internal gear pump comprises a body, a front cover and a rear cover, wherein a cavity is arranged in the body, and the internal gear pump divides the cavity into a high-pressure oil cavity and a low-pressure oil cavity by utilizing a pressure retainer. An oil inlet and an oil outlet of the internal gear pump are both arranged on the body, and when oil enters the low-pressure oil chamber from the oil inlet, the oil firstly passes through a through hole arranged on the inner gear ring to enter the inner gear ring, then flows out of the inner gear ring from the through hole of the high-pressure area, and finally flows out of the oil outlet. Because oil needs to pass through the perforation of ring gear twice, consequently the perforation number on the ring gear must be many, but the perforation can form the vortex and hinder, influences the promotion of the pressure of oil. In addition, holes must be drilled in the body to provide oil inlets and outlets, but the body is a main structure for bearing high-temperature and high-pressure oil, and the strength of the body structure is affected by the drilling in the body. In addition, if there is impurity foreign matter in the fluid, the scratch of the inner wall and the oil outlet of the high pressure oil chamber is easily caused, and further the problems of unable pressure rise and flow loss are caused, which results in the failure of the internal gear pump.
Disclosure of Invention
In view of the above, there is a need for a crescent gear pump that can reduce turbulence and improve pressurization efficiency.
A crescent gear pump according to an embodiment of the present invention includes: a pump body; the pump body, the first end cover and the second end cover jointly define an inner cavity; the inner gear ring is arranged in the inner cavity; the rotating shaft is arranged in the inner gear ring, an outer gear is arranged on the rotating shaft, and the outer gear and the inner gear ring are eccentrically arranged and are mutually meshed; the pressure retainer assembly is arranged between the inner gear ring and the outer gear and divides a space between the inner gear ring and the outer gear into a high-pressure oil cavity and a low-pressure oil cavity; the two pressure plates are arranged in the inner cavity and respectively arranged at two ends of the inner ring gear to seal and cover a space between the inner ring gear and the outer gear, wherein an oil inlet and an oil inlet flow passage are arranged on the first end cover, the oil inlet flow passage is communicated with the oil inlet and the low-pressure oil cavity, an oil outlet and an oil outlet flow passage are arranged on the first end cover or the second end cover, the oil outlet and the oil inlet are spaced, an oil passing hole is arranged on the pressure plate adjacent to the oil outlet, and the oil outlet flow passage penetrates through the oil passing hole to be communicated with the oil outlet and the high-pressure oil cavity.
Specifically, the inner concave surface of the pressure retainer component is tightly attached to the outer gear, the outer convex surface of the pressure retainer component is tightly attached to the inner gear ring, the internal gear pump is generally used for conveying liquid with high viscosity, such as lubricating oil and combustion oil, which are not suitable for conveying liquid with low viscosity, the liquid flows through the oil inlet flow channel via the oil inlet to enter the low-pressure oil cavity, the gear teeth of the outer gear are gradually separated from the gear teeth of the inner gear ring in the low-pressure oil cavity to form vacuum continuous oil suction to enter the low-pressure oil cavity, the liquid is brought into the high-pressure oil cavity along with gaps between the gear teeth of the outer gear and the gear teeth of the inner gear ring, the gear teeth of the outer gear and the gear teeth of the inner gear ring are gradually meshed to continuously extrude a space, the liquid is discharged via the oil passing hole, and the discharged liquid flows out of the oil outlet via the oil outlet flow channel to be discharged out of the internal gear pump.
It can be understood that the first end cover may be provided with an oil inlet and an oil inlet flow passage, and the first end cover may be provided with an oil outlet and an oil outlet flow passage, wherein the oil outlet and the oil inlet are spaced from each other; the first end cover is provided with an oil inlet and an oil inlet flow passage, and the second end cover is provided with an oil outlet and an oil outlet flow passage.
According to the internal gear pump provided by the embodiment of the invention, holes do not need to be drilled on the internal gear ring, liquid is led into the internal gear pump from the internal gear pump by arranging the oil inlet and the oil inlet flow passage on the first end cover, liquid is discharged out of the internal gear pump from the internal gear pump by arranging the oil outlet and the oil outlet flow passage on the first end cover or the second end cover, and the pump body is a main structure for bearing high-temperature and high-pressure oil, so that the structural strength of the pump body can be ensured without drilling the pump body, and the internal gear ring is not provided with the through holes, so that the liquid enters from the side edge of the inner cavity when entering and exiting from the inner cavity in the pump body, and the generation of turbulent flow can be reduced when the internal gear ring rotates.
Optionally, the first end cover is a rear end cover or a front end cover, which means that the oil inlet and the oil inlet flow passage may be disposed on the rear end cover, and the oil outlet flow passage may be disposed on the rear end cover; or the oil inlet and the oil inlet flow passage are arranged on the rear end cover, and the oil outlet flow passage are arranged on the front end cover; or the oil inlet and the oil inlet flow passage are arranged on the front end cover, and the oil outlet flow passage are arranged on the front end cover; or the oil inlet and the oil inlet flow passage are arranged on the front end cover, and the oil outlet flow passage are arranged on the rear end cover, so that the specification design of the internal gear pump can be diversified, and different requirements of users can be met.
Optionally, the oil inlet and the oil outlet are both arranged on the first end cover. The first end cover is a rear end cover or a front end cover, which means that the oil inlet and the oil inlet flow passage can be arranged on the rear end cover, and the oil outlet flow passage can be arranged on the rear end cover; or the oil inlet and the oil inlet flow passage are arranged on the front end cover, and the oil outlet flow passage are arranged on the front end cover, so that the structural design of the internal gear pump can be simplified.
Optionally, the central axis of the oil inlet is parallel to or perpendicular to the central axis of the inner gear ring, so that the structural design of the inner gear pump can be further simplified, and the length of the oil inlet flow passage is shortened.
Optionally, the central axis of the oil outlet is parallel to or perpendicular to the central axis of the inner gear ring, so that the structural design of the ring gear pump can be further simplified, and the length of the oil outlet flow passage is shortened.
Optionally, the pump body is provided with an annular lubrication groove inside for sealing and lubrication.
Optionally, the outer surface of the inner gear ring is a smooth surface, so that the inner gear ring can further reduce the generation of turbulence during rotation.
Alternatively, the pressure plate is crescent-shaped, and the pressure plate can reduce the overall weight of the internal gear pump on the premise of covering the space between the ring gear and the external gear due to the crescent-shaped space between the ring gear and the external gear.
The invention has the beneficial effects that: need not to set up oil inlet or oil-out on the pump body, need not to drill on the pump body, can ensure pump body structural integrality, also need not to set up the perforation on the inner ring gear for liquid all gets into by the side of inner chamber when the inner chamber of business turn over pump body, makes the inner ring gear can reduce the production of vortex when rotating.
Drawings
FIG. 1 is an angled perspective view of a crescent gear pump according to an embodiment of the present invention;
FIG. 2 is another angled perspective view of a crescent gear pump according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view in the width direction of a crescent gear pump according to an embodiment of the present invention;
FIG. 4 is a length-wise cross-sectional view of a crescent gear pump according to some embodiments of the present invention;
FIG. 5 is a length-wise cross-sectional view of a crescent gear pump according to further embodiments of the present invention;
fig. 6 is an exploded view of a crescent gear pump according to an embodiment of the present invention.
Reference numerals:
the internal gear pump 1 is provided with a gear pump,
the high-pressure oil chamber 112, the low-pressure oil chamber 114,
the pump body 10 is provided with a pump body,
a first end cover 20, an oil inlet 21, an oil inlet flow passage 22, an oil outlet 23, an oil outlet flow passage 24, a first bearing 25,
the length of the second end cap 30, the second bearing 31,
the ring gear 40, the rotating shaft 50, the outer gear 51,
a pressure holder assembly 60, an overhead shaft 61, a pressure holder positive plate 62, a pressure holder negative plate 63,
the pressure side plate group 70, the pressure side plate 71, the oil passing hole 712, the back support ring 72 and the back support ring oil seal 73.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to specific embodiments and drawings, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive labor.
A crescent gear pump according to an embodiment of the present invention is described below with reference to fig. 1-6.
As shown in fig. 1 to 4, a crescent gear pump 1 according to an embodiment of the present invention includes: the pump body 10, the first and second end caps 20, 30, the ring gear 40, the rotating shaft 50, the pressure retainer assembly 60, and the two pressure side plate groups 70.
The first end cover 20 and the second end cover 30 are respectively arranged at two ends of the pump body 10, and the pump body 10, the first end cover 20 and the second end cover 30 jointly define an inner chamber; the inner gear ring 40 is arranged in the inner cavity; the rotating shaft 50 is arranged in the inner gear ring 40, the rotating shaft 50 is provided with an outer gear 51, and the outer gear 51 and the inner gear ring 40 are eccentrically arranged and are mutually meshed; the pressure holder assembly 60 is provided between the ring gear 40 and the outer gear 51, the pressure holder assembly 60 dividing a space between the ring gear 40 and the outer gear 51 into a high-pressure oil chamber 112 and a low-pressure oil chamber 114; the two pressure side plate assemblies 70 are arranged in the inner cavity, the two pressure side plate assemblies 70 are respectively arranged at two ends of the ring gear 40 to seal and cover a space between the ring gear 40 and the outer gear 51, wherein an oil inlet 21 and an oil inlet flow passage 22 are arranged on the first end cover 20, the oil inlet flow passage 22 is communicated with the oil inlet 21 and the low-pressure oil cavity 114, an oil outlet 23 and an oil outlet flow passage 24 are arranged on the first end cover 20 or the second end cover 30, the oil outlet 23 and the oil inlet 21 are spaced from each other, an oil passing hole 712 is arranged on the pressure side plate assembly 70 adjacent to the oil outlet 23, and the oil outlet flow passage 24 passes through the oil passing hole 712 to be communicated with the oil outlet 23 and the high-pressure oil cavity 112.
Specifically, the inner concave surface of the pressure holder assembly 60 is closely attached to the outer gear 51, the outer convex surface of the pressure holder assembly 60 is closely attached to the ring gear 40, the internal gear pump 1 is generally used for conveying a liquid having a relatively large viscosity, such as lubricating oil and combustion oil, which are not suitable for transporting liquid having a relatively low viscosity, the liquid flows through the oil inlet passage 22 into the low-pressure oil chamber 114 via the oil inlet 21, the gear teeth of the outer gear 51 are gradually separated from the gear teeth of the inner gear ring 40 in the low-pressure oil chamber 114 to form a vacuum to continuously suck oil into the low-pressure oil chamber 114, the liquid is brought into the high-pressure oil chamber 112 along with the gaps between the gear teeth and the gear teeth of the outer gear 51, in the high-pressure oil chamber 112, the gear teeth of the external gear 51 and the gear teeth of the ring gear 40 gradually mesh to continuously press the space, the liquid is discharged through the oil passing hole 712, and the discharged liquid flows out of the oil outlet 23 through the oil outlet flow passage 24 and is discharged out of the ring gear pump 1. Liquid enters the low-pressure oil chamber 114 through the side edge of the inner chamber and flows into the high-pressure oil chamber 112 through the side edge of the inner chamber, holes do not need to be formed in the inner gear ring 40, the formation of turbulent flow inside the inner chamber can be effectively reduced, and pressurization and flowing of the liquid are facilitated.
It should be noted that the ring gear 40 is annular, a plurality of gear teeth are provided inside the ring gear 40, and a plurality of gear teeth are provided on the outer surface of the outer gear 51.
It can be understood that the first end cap 20 may be provided with an oil inlet 21 and an oil inlet flow passage 22, and the first end cap 20 may also be provided with an oil outlet 23 and an oil outlet flow passage 24, where the oil outlet 23 and the oil inlet 21 are spaced from each other; the first end cap 20 may be provided with an oil inlet 21 and an oil inlet flow passage 22, and the second end cap 30 may be provided with an oil outlet 23 and an oil outlet flow passage 24.
According to the internal gear pump 1 provided by the embodiment of the invention, holes do not need to be drilled on the internal gear ring 40, liquid is led into the internal gear pump 1 from the internal gear pump 1 by arranging the oil inlet 21 and the oil inlet flow passage 22 on the first end cover 20, the liquid is led into the internal gear pump 1 from the internal gear pump 20 by arranging the oil outlet 23 and the oil outlet flow passage 24 on the first end cover 20 or the second end cover 30, the liquid is discharged out of the internal gear pump 1 from the internal gear pump 1, because the pump body 10 is a main structure for bearing high-temperature and high-pressure oil, the structural strength of the pump body 10 can be ensured without drilling the pump body 10, the internal gear ring 40 is not provided with the holes, the liquid enters from the side edge of an inner cavity when entering and exiting the inner cavity in the pump body 10, and the generation of turbulent flow of the internal gear ring 40 can be reduced when rotating.
As shown in fig. 6, optionally, a first shaft hole is formed in the first end cap 20, a first bearing 25 is disposed in the first shaft hole, and one end of the rotating shaft 50 is inserted into the first bearing 25.
As shown in fig. 6, optionally, a second shaft hole is formed in the second end cap 30, a second bearing 31 is disposed in the second shaft hole, and the other end of the rotating shaft 50 is inserted into the second bearing 31.
Alternatively, one end of the pressure retainer assembly 60 is pivotally connected to the first end cap 20 and the other end of the pressure retainer assembly 60 is pivotally connected to the second end cap 30.
As shown in fig. 6, optionally, the pressure holder assembly 60 includes an overhead shaft 61, a pressure holder positive piece 62 and a pressure holder secondary piece 63, the pressure holder positive piece 62 and the pressure holder secondary piece 63 are placed at the groove of the overhead shaft 61, and an elastic piece is provided between the pressure holder positive piece 62 and the pressure holder secondary piece 63, and the elastic piece can expand and expand the pressure holder secondary piece 63 relative to the pressure holder positive piece 62, so that the pressure holder assembly 60 has a better effect of limiting the high-pressure oil chamber 112 and the low-pressure oil chamber 114, and has a better sealing performance.
As shown in fig. 6, optionally, the pressure side plate group 70 specifically includes a pressure side plate 71, a back support ring 72 and a back support ring oil seal 73, the pressure side plate 71 is clamped in the back support ring 72, the first end cap 20 is provided with a first mounting groove, the second end cap 30 is provided with a second mounting groove, one back support ring 72 is clamped in the first mounting groove, the back support ring oil seal 73 is arranged between the back support ring 72 and the first mounting groove, the other back support ring 72 is clamped in the second mounting groove, and the back support ring oil seal 73 is arranged between the back support ring 72 and the second mounting groove.
Alternatively, the first end cover 20 is a rear end cover or a front end cover, which means that the oil inlet 21 and the oil inlet flow passage 22 can be provided on the rear end cover, and the oil outlet 23 and the oil outlet flow passage 24 can be provided on the rear end cover; or the oil inlet 21 and the oil inlet flow passage 22 are arranged on the rear end cover, and the oil outlet 23 and the oil outlet flow passage 24 are arranged on the front end cover; or the oil inlet 21 and the oil inlet flow passage 22 are arranged on the front end cover, and the oil outlet 23 and the oil outlet flow passage 24 are arranged on the front end cover; or the oil inlet 21 and the oil inlet runner 22 are arranged on the front end cover, and the oil outlet 23 and the oil outlet runner 24 are arranged on the rear end cover, so that the specification design of the internal gear pump 1 can be diversified, and different requirements of users can be met.
Optionally, both the oil inlet 21 and the oil outlet 23 are provided on the first end cap 20. The first end cover 20 is a rear end cover or a front end cover, which means that the oil inlet 21 and the oil inlet flow passage 22 can be arranged on the rear end cover, and the oil outlet 23 and the oil outlet flow passage 24 can be arranged on the rear end cover; or the oil inlet 21 and the oil inlet flow passage 22 are arranged on the front end cover, and the oil outlet 23 and the oil outlet flow passage 24 are arranged on the front end cover, so that the structural design of the internal gear pump 1 can be simplified.
As shown in fig. 4 and 5, optionally, the central axis of the oil inlet 21 is parallel to or perpendicular to the central axis of the ring gear 40, so that the structural design of the internal gear pump 1 can be further simplified, and the length of the oil inlet flow passage 22 can be shortened.
As shown in fig. 4 and 5, optionally, the central axis of the oil outlet 23 is parallel to or perpendicular to the central axis of the ring gear 40, thereby further simplifying the structural design of the internal gear pump 1 and shortening the length of the oil outlet flow passage 24.
Optionally, an annular lubrication groove is provided inside the pump body 10 for sealing and lubrication.
Optionally, the outer surface of the ring gear 40 is a smooth surface, which can further reduce the generation of turbulence when the ring gear 40 rotates, and contribute to the increase of the internal pressure of the internal gear pump 1.
As shown in fig. 6, alternatively, the pressure side plate group 70 is crescent-shaped, and since the space between the ring gear 40 and the external gear 51 is crescent-shaped, the pressure side plate group 70 can reduce the overall weight of the internal gear pump 1 while covering the space between the ring gear 40 and the external gear 51.
The invention has the beneficial effects that: the oil inlet 21 or the oil outlet 23 is not required to be arranged on the pump body 10, the hole drilling is not required to be carried out on the pump body 10, the structural integrity of the pump body 10 can be guaranteed, the inner gear ring 40 is not required to be provided with a through hole, liquid enters from the side edge of the inner cavity when entering and exiting from the inner cavity in the pump body 10, and the inner gear ring 40 can reduce the generation of turbulent flow when rotating.
It will be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," "top," "inner," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.
The terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features. In the description of the present invention, a "set" means two or more unless otherwise specified.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (7)

1. A crescent gear pump, comprising:
a pump body;
the pump body, the first end cover and the second end cover jointly define an inner cavity;
the inner gear ring is arranged in the inner cavity;
the rotating shaft is arranged in the inner gear ring, an outer gear is arranged on the rotating shaft, and the outer gear and the inner gear ring are eccentrically arranged and are mutually meshed;
a pressure holder assembly provided between the inner ring gear and the outer gear, the pressure holder assembly dividing a space between the inner ring gear and the outer gear into a high-pressure oil chamber and a low-pressure oil chamber;
two pressure plates arranged in the inner cavity, the two pressure plates are respectively arranged at two ends of the inner gear ring to cover the space between the inner gear ring and the outer gear,
the oil inlet channel is communicated with the oil inlet and the low-pressure oil cavity, an oil outlet and an oil outlet channel are arranged on the first end cover or the second end cover, the oil outlet and the oil inlet are spaced, an oil passing hole is formed in the pressure plate adjacent to the oil outlet, and the oil outlet channel penetrates through the oil passing hole to be communicated with the oil outlet and the high-pressure oil cavity.
2. The crescent gear pump of claim 1, wherein the oil inlet and the oil outlet are both disposed on the first end cap.
3. The crescent gear pump of claim 1, wherein a central axis of the oil inlet is parallel or perpendicular to a central axis of the ring gear.
4. A crescent gear pump according to claim 1, wherein the central axis of the oil outlet is parallel or perpendicular to the central axis of the ring gear.
5. A crescent gear pump according to claim 1, characterized in that the pump body is provided with an annular lubrication groove on the inside.
6. A crescent gear pump according to claim 1, wherein the outer surface of the ring gear is a smooth surface.
7. A crescent gear pump according to claim 1, wherein said pressure plate is crescent shaped.
CN202111146833.5A 2021-09-29 2021-09-29 Internal gear pump Pending CN113757111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111146833.5A CN113757111A (en) 2021-09-29 2021-09-29 Internal gear pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111146833.5A CN113757111A (en) 2021-09-29 2021-09-29 Internal gear pump

Publications (1)

Publication Number Publication Date
CN113757111A true CN113757111A (en) 2021-12-07

Family

ID=78798100

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111146833.5A Pending CN113757111A (en) 2021-09-29 2021-09-29 Internal gear pump

Country Status (1)

Country Link
CN (1) CN113757111A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114542455A (en) * 2022-01-18 2022-05-27 上海瑚石制冷设备科技有限公司 Gear pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114542455A (en) * 2022-01-18 2022-05-27 上海瑚石制冷设备科技有限公司 Gear pump

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