CN215170722U - Internal gear pump - Google Patents
Internal gear pump Download PDFInfo
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- CN215170722U CN215170722U CN202120776882.6U CN202120776882U CN215170722U CN 215170722 U CN215170722 U CN 215170722U CN 202120776882 U CN202120776882 U CN 202120776882U CN 215170722 U CN215170722 U CN 215170722U
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- mainboard
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Abstract
The utility model relates to a gear pump technical field discloses an crescent gear pump, include: the pump comprises a pump body, an inner gear ring arranged in the pump body, a gear shaft eccentrically arranged on the inner gear ring and meshed with the inner gear ring, and a crescent plate arranged between the inner gear ring and the gear shaft, wherein the crescent plate divides a pump chamber between the inner gear ring and the gear shaft into a high-pressure region and a low-pressure region, the crescent plate comprises a crescent main plate and a crescent auxiliary plate, the inner side of the crescent main plate is tightly attached to the gear shaft, a balance hole is formed in the crescent main plate, the balance hole penetrates through two side faces of the crescent main plate, and the balance hole is communicated with the high-pressure region; the outer side circular arc of the crescent auxiliary plate is tightly attached to the inner gear ring, and the inner side circular arc of the crescent auxiliary plate is matched with the outer side circular arc of the crescent main plate. Through set up balanced hole on the crescent mainboard for the pressure balance of crescent mainboard both sides avoids the crescent mainboard fracture.
Description
Technical Field
The utility model relates to a technical field of gear pump especially relates to an inside engaged gear pump.
Background
At present, when high-speed type injection molding machine crescent gear pump (oil pump) was used in the market, crescent mainboard cracked fault rate was very high in the oil pump, crescent mainboard and subplate pressure balance mainly relied on both sides to join in marriage the food tray oilhole and balance the pressure between the crescent owner subplate in the current oil pump for main subplate atress is uneven.
High-speed type injection molding machine in the existing market, a duty cycle is 5 seconds probably and accomplishes for the oil pump need accomplish pressurization and pressure release in the short time, and in the structure at present, under the quick impact, the balanced feedback of oil distribution disc oilhole is not come, and the crescent mainboard is frequently atress assaulted, makes the crescent mainboard tired, causes the fracture.
It is therefore desirable to provide a crescent gear pump that addresses the above-mentioned deficiencies.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a crescent gear pump is aimed at providing to reduce the technical problem of crescent mainboard fracture risk in the oil pump.
The embodiment of the utility model provides a solve its technical problem and adopt following technical scheme: the utility model provides a pair of crescent gear pump, include: the pump comprises a pump body, an inner gear ring arranged in the pump body, a gear shaft eccentrically arranged on the inner gear ring and meshed with the inner gear ring, and a crescent plate arranged between the inner gear ring and the gear shaft, wherein a pump chamber between the inner gear ring and the gear shaft is divided into a high-pressure area and a low-pressure area by the crescent plate.
The crescent plate comprises a crescent main plate and a crescent auxiliary plate, the inner side arc of the crescent main plate is tightly attached to the gear shaft, a balance hole is formed in the crescent main plate, the balance hole penetrates through two side faces of the crescent main plate, and the balance hole is communicated with the high-pressure area; the outer side circular arc of the crescent auxiliary plate is tightly attached to the inner gear ring, and the inner side circular arc of the crescent auxiliary plate is matched with the outer side circular arc of the crescent main plate. And an elastic sealing mechanism is further arranged between the crescent main plate and the crescent auxiliary plate.
In some embodiments, the included angle between the central axis of the balance hole and the reference direction is 10-15 degrees, taking the direction perpendicular to the end face of the crescent main plate close to the low-pressure area as the reference direction.
In some embodiments, the central axis of the balancing hole is at an angle of 15 degrees to the reference direction along the arc direction of the crescent main plate from the low pressure region to the high pressure region.
In some embodiments, the number of balancing holes is 3, three of the balancing holes are positioned at 1/4, 2/4, and 3/4, respectively, of the crescent moon shaped main plate height.
In some embodiments, oil distribution plates are respectively arranged on the upper side and the lower side of the pump body, and oil distribution holes communicated with the pump chamber are formed in the oil distribution plates.
In some embodiments, the gear pump further comprises a positioning rod and a positioning pin, the crescent main plate is fixed on the oil distribution plate and assembled to the pump body through the positioning rod, and the crescent auxiliary plate is connected to the crescent main plate through the positioning pin.
In some embodiments, the number of the elastic sealing mechanisms is 2, and two elastic sealing mechanisms divide the joint surface of the crescent main plate and the crescent auxiliary plate into a first gap area close to the positioning rod, a third gap area far away from the positioning rod, and a second gap area between the first gap area and the third gap area.
In some embodiments, the elastic sealing mechanism includes a positioning groove disposed outside the crescent main plate, a spring plate disposed in the sealing groove, and a sealing rod positioned outside the spring plate.
In some embodiments, the first gap region communicates with the low pressure region.
In some embodiments, an oil through opening is formed in the crescent auxiliary plate, the oil through opening penetrates through two side surfaces of the crescent auxiliary plate, and the second clearance area is communicated with the high pressure area through the oil through opening and the oil distribution hole.
In some embodiments, the third clearance region communicates with the high pressure region through a neutral between the crescent moon main plate and the crescent moon sub plate.
The utility model has the advantages that: the embodiment of the utility model provides a pair of crescent gear pump is through setting up the balancing hole on the crescent mainboard, makes crescent mainboard both sides atress is balanced, eliminates the high pressure oil and causes the cracked problem of crescent mainboard.
Drawings
One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.
Fig. 1 is a schematic structural view of a ring gear pump according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of an oil distribution plate of the crescent gear pump of FIG. 1;
FIG. 3 is a partial side elevational view of a crescent plate in the crescent gear pump of FIG. 1;
FIG. 4 is a cross-sectional view taken along A-A of FIG. 3;
fig. 5 is a schematic structural view of an elastic seal mechanism in the internal gear pump shown in fig. 1.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and embodiments. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Fig. 1 is a schematic structural diagram of an internal gear pump 100 according to an embodiment of the present invention. The internal gear pump 100 includes a pump body, an inner gear ring 10 disposed in the pump body, a gear shaft 20 eccentrically disposed on the inner gear ring 10 and engaged with the inner gear ring, oil distribution plates 30 disposed at both sides of the pump body 10 and forming a lubrication seal with the gear shaft 20 and the inner gear ring 10 and distributing oil, and a crescent plate 40 disposed between the inner gear ring 10 and the gear shaft 20. The gear shaft 20 is engaged with the ring gear 10 in one circumferential section. The ring gear pump 100 delivers a liquid in a manner known per se, as a result of the rotational drive of the gear shaft 20, the ring gear 10 being driven in rotation therewith.
The internal gear pump 100 is arranged as a hydraulic pump or a so-called recirculating pump in an injection molding machine or other plant.
A crescent-shaped pump chamber is arranged between the inner gear ring 10 and the gear shaft 20, and an oil suction port (not shown) and an oil discharge port (not shown) which are communicated with the pump chamber are arranged on the pump body in the areas of two end parts of the pump chamber.
Referring to fig. 2, the oil distribution plate 30 is provided with an oil distribution hole 31 communicating with the pump chamber.
The crescent plate 40 is located between the oil inlet and the oil outlet and is arranged in the pump chamber, the outer arc of the crescent plate 40 is tightly attached to the tops of the teeth of the ring gear 10, and the inner arc of the crescent plate 40 is tightly attached to the tops of the teeth of the gear shaft 20. The crescent 40 divides the pump chamber into two pressure zones, a low pressure zone S corresponding to the suction port and a high pressure zone P corresponding to the discharge port.
The crescent 40 serves to divide the high and low pressure region S by forming a seal by contacting with the elongated strip using the tooth tips between the ring gear 10 and the gear shaft 20. When the gear shaft 20 drives the inner gear ring 10 to rotate in the same direction, the gear shaft 20 and the inner gear ring 10 are separated from each other near the oil suction port to form negative pressure to suck liquid, and the gear shaft 20 and the inner gear ring 10 are continuously embedded and meshed near the oil discharge port to form high pressure to extrude and output the liquid. Therefore, the crescent 40 is simultaneously contacted with the gear shaft 20 and the ring gear 10, and a gap formed therebetween is reduced by a compensation structure.
For the above compensation structure, specifically, the crescent plate 40 includes a crescent main plate 41 and a crescent auxiliary plate 42, the crescent main plate 41 is fixed to the oil distribution plate 30 and is assembled to the pump body through a positioning rod 50, and an inner side arc of the crescent main plate 41 is tightly attached to a tooth crest of teeth of the ring gear 10, the crescent auxiliary plate 42 is connected to one end of the crescent main plate 41 close to the positioning rod 50 through a positioning pin 60, and an outer side arc of the crescent auxiliary plate 42 is tightly attached to a tooth crest of teeth of the gear shaft 20. Crescent auxiliary plate 42 passes through the spacing assembly of crescent mainboard 41 profile, specifically, crescent auxiliary plate 42 the inboard with crescent mainboard 41's the outside is the arc adaptation, just crescent mainboard 41 with form the clearance between crescent auxiliary plate 42 and can open and shut the structure.
In some embodiments, a balance hole 411 is formed in a side surface of one end of the crescent main plate 41 away from the positioning rod 50, the balance hole 411 penetrates through two sides of the crescent main plate 41, and the balance hole 411 is communicated with the high pressure region P, so that pressure on two sides of the crescent main plate is balanced, and the problem that the crescent main plate 41 is broken due to high oil pressure is solved.
Referring to fig. 3, the number of the balance holes 411 may be set according to practical situations, for example, the number of the balance holes 411 is 3, and three balance holes 411 are respectively disposed at 1/4, 2/4 and 3/4 of the height of the crescent main plate 41.
Referring to fig. 4, a direction perpendicular to the end surface of the crescent main plate near the low-pressure area S is defined as a reference direction x, and an included angle between the central axis of the balance hole 411 and the reference direction x is 10-15 degrees.
In some embodiments, the central axis of the balancing hole 411 is at an angle of 15 degrees with the reference direction x along the arc direction of the crescent main plate 41 from the low pressure region S to the high pressure region P.
Referring to fig. 5, an elastic sealing mechanism 70 is provided in the opening and closing structure, so that the crescent main plate 41 and the crescent auxiliary plate 42 are respectively in contact with the ring gear 10 and the gear shaft 20 by a compression force of the elastic sealing mechanism 70 in a start and low pressure state of the internal gear pump 100, and a gap is compensated.
However, when the internal gear pump 100 operates, a pressure difference is gradually formed between both ends of the crescent plate 40, and high-pressure oil may enter through a gap at one end of the crescent main plate 41 and the crescent auxiliary plate 42 away from the positioning rod 50 and then leak through a gap at an end of the crescent main plate 41 close to one end of the positioning rod 50. In order to prevent the pressure oil from leaking from the gap, the elastic sealing mechanism 70 also seals the gap between the crescent main plate 41 and the crescent sub plate 42 to form a sealed space.
The elastic sealing mechanism 70 includes a sealing groove 71 disposed along an arc surface on an outer side surface of the crescent main plate 41, a spring plate 72 disposed in the sealing groove 71 to provide the compressive force, and a sealing rod 73 positioned outside the spring plate 72 to form a seal. The opening of the seal groove 71 faces the crescent sub-plate 42, and the spring piece 72 is provided so that the seal rod 73 is always in contact with the edge of the seal groove 71 and the inner surface of the crescent sub-plate 42.
In some embodiments, there are two elastic sealing mechanisms 70 between the inner side surface of the crescent sub-plate 42 and the outer side surface of the crescent main plate 41, and three gap spaces are formed by the two elastic sealing mechanisms 70, namely a first gap space a close to the positioning rod 50, a third gap space c far from the positioning rod 50, and a second gap space b between the first gap space a and the third gap space c.
The first gap space a is communicated with the low-pressure area S through a gap arranged on the end surface of the crescent main plate 41 close to the positioning rod 50.
An oil through hole 421 is formed in the crescent auxiliary plate 42, the oil through hole 421 penetrates through two side surfaces of the crescent auxiliary plate 42, and the second gap space b is communicated with the high-pressure region P through the oil through hole 421 and the oil distribution hole 31.
The third clearance space c communicates with the high pressure region P through a neutral position g between the crescent main plate 41 and the crescent sub-plate 42. Therefore, the crescent auxiliary plate 42 forms pressure balance through the neutral position g and the oil through hole 421, and the problem of breakage of the crescent auxiliary plate 42 caused by the pressure of high-pressure oil is solved.
The embodiment of the utility model provides a pair of crescent gear pump is through setting up the balancing hole on the crescent mainboard, makes crescent mainboard both sides atress is balanced, eliminates the high pressure oil and causes the cracked problem of crescent mainboard.
It should be noted that the preferred embodiments of the present invention are described in the specification and the drawings, but the present invention can be realized in many different forms, and is not limited to the embodiments described in the specification, and these embodiments are not provided as additional limitations to the present invention, and are provided for the purpose of making the understanding of the disclosure of the present invention more thorough and complete. Moreover, the above features are combined with each other to form various embodiments not listed above, and all of them are considered as the scope of the present invention described in the specification; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An internal gear pump, includes the pump body, sets up ring gear in the pump body, eccentric set up in the ring gear and with the gear shaft of ring gear meshing, and set up in the crescent between ring gear and gear shaft, the crescent will pump chamber between ring gear and the gear shaft divide into high-pressure district and low-pressure area, its characterized in that, the crescent includes:
the inner side arc of the crescent main plate is tightly attached to the gear shaft, a balance hole is formed in the crescent main plate, the balance hole penetrates through two side faces of the crescent main plate, and the balance hole is communicated with the high-pressure area;
the outer side arc of the crescent auxiliary plate is tightly attached to the inner gear ring, and the inner side arc of the crescent auxiliary plate is matched with the outer side arc of the crescent main plate;
and an elastic sealing mechanism is further arranged between the crescent main plate and the crescent auxiliary plate.
2. A crescent gear pump according to claim 1,
and the direction perpendicular to the end face of the crescent main plate close to the low-pressure area is taken as a reference direction, and the included angle between the central axis of the balance hole and the reference direction is 10-15 degrees.
3. A crescent gear pump according to claim 2,
and the included angle between the central axis of the balance hole and the reference direction is 15 degrees along the radian direction of the crescent main plate from the low-pressure region to the high-pressure region.
4. A crescent gear pump according to claim 1,
and oil distribution plates are respectively arranged on the upper side and the lower side of the pump body, and oil distribution holes communicated with the pump chamber are formed in the oil distribution plates.
5. A crescent gear pump according to claim 4,
the gear pump further comprises a positioning rod and a positioning pin, the crescent mainboard is fixed on the oil distribution plate, the positioning rod is assembled on the pump body, and the crescent auxiliary plate is connected with the crescent mainboard through the positioning pin.
6. A crescent gear pump according to claim 5,
the number of the elastic sealing mechanisms is 2, and the two elastic sealing mechanisms divide the binding surface of the crescent mainboard and the crescent auxiliary plate into a first gap area close to the positioning rod, a third gap area far away from the positioning rod and a second gap area between the first gap area and the third gap area.
7. A crescent gear pump according to claim 6, wherein
The elastic sealing mechanism comprises a positioning groove arranged on the outer side of the crescent mainboard, a spring piece arranged in the sealing groove and a sealing rod positioned on the outer side of the spring piece.
8. A crescent gear pump according to claim 6,
the first gap region communicates with the low pressure region.
9. A crescent gear pump according to claim 6,
an oil through hole is formed in the crescent auxiliary plate and penetrates through two side faces of the crescent auxiliary plate, and the second clearance area is communicated with the high-pressure area through the oil through hole and the oil distribution hole.
10. A crescent gear pump according to claim 6,
the third clearance district through the crescent mainboard with the neutral gear between the crescent accessory plate with high-pressure area intercommunication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120776882.6U CN215170722U (en) | 2021-04-15 | 2021-04-15 | Internal gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120776882.6U CN215170722U (en) | 2021-04-15 | 2021-04-15 | Internal gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215170722U true CN215170722U (en) | 2021-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120776882.6U Active CN215170722U (en) | 2021-04-15 | 2021-04-15 | Internal gear pump |
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| CN (1) | CN215170722U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718860A (en) * | 2022-03-04 | 2022-07-08 | 浙江凯斯特液压有限公司 | Internal gearing double-linkage booster gear pump |
-
2021
- 2021-04-15 CN CN202120776882.6U patent/CN215170722U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718860A (en) * | 2022-03-04 | 2022-07-08 | 浙江凯斯特液压有限公司 | Internal gearing double-linkage booster gear pump |
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