CN205013275U - Gear pump and be used for unsteady curb plate of gear pump - Google Patents
Gear pump and be used for unsteady curb plate of gear pump Download PDFInfo
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- CN205013275U CN205013275U CN201520663926.9U CN201520663926U CN205013275U CN 205013275 U CN205013275 U CN 205013275U CN 201520663926 U CN201520663926 U CN 201520663926U CN 205013275 U CN205013275 U CN 205013275U
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- floating side
- ring gear
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Abstract
The utility model discloses a gear pump and be used for unsteady curb plate of gear pump, the gear pump includes: the pump cylinder is formed with the inner chamber in, intracavity including ring gear, ring gear are rotatably established, gear shaft, gear shaft are rotatably established on the pump cylinder, have the external gear on the gear shaft, and the external gear is established and is meshed in the ring gear inboard and with the ring gear, and the axis of external gear is setovered with the axis of ring gear each other, the curb plate floats, unsteady curb plate is established between the medial surface of inner chamber and the terminal surface of gear pair, the curb plate that floats towards being equipped with on the surface of gear pair is used for reducing the rete of between curb plate and gear pair frictional force of floating. According to the utility model discloses a gear pump can reduce the friction torque that the gear pump moved the in -process.
Description
Technical field
The utility model relates to oil hydraulic pump technical field, and particularly a kind of gear pump is namely for the floating side plate of gear pump.
Background technique
Disclose a kind of nose balance parts in the gear pump of correlation technique, these nose balance parts comprise: copper side plate; And the profiled seal back-up ring to contact with copper side plate, it is formed in one in meniscate seal ring; And be arranged on the pin middle pump cover also passing large compensation sheet and copper side plate, for fixing described large compensation sheet and copper side plate.Described special-shaped back-up ring is formed in one and is meniscate seal ring, same sealing material is adopted in working process, first shaping by mold cure process, then through overaging heat treatment, this special-shaped back-up ring rebound elasticity is good, and it can be utilized to be compensated axial clearance by the rebounding force after compressing.
In correlation technique, nose balance part is made up of Sealing shield ring, special-shaped seal ring, copper side plate, and gear pump in the course of the work, when gear face and copper side plate match grinding, because friction factor is comparatively large, the moment of torsion of pump is not only made to increase, also cause the wear rate of copper side plate higher, the life-span is shorter.In addition, Sealing shield ring and different in nature seal ring all must be shaping by mold cure process, then through overaging heat treatment, cause the gear pump process-cycle longer, cost is higher.
Model utility content
The utility model is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, an object of the present utility model is to propose a kind of gear pump, can reduce friction torque, and improves the stability of gear pump operation.
According to gear pump of the present utility model, comprising: pumping cylinder, in described pumping cylinder, be formed with inner chamber; Ring gear, described ring gear is rotatably located in described inner chamber; Gear shaft, described gear shaft is rotatably located on described pumping cylinder, described gear shaft has external gear, and described external gear is located to engage inside described ring gear and with described ring gear and forms gear pair, and the axis of the axis of described external gear and described ring gear is biased mutually; Floating side plate, described floating side plate is located between the inner side surface of described inner chamber and the end face of described gear pair, and the surface towards described gear pair of described floating side plate is provided with the rete for reducing frictional force between described floating side plate and gear pair.
According to gear pump of the present utility model, floating side plate is provided with rete, thus reduces ring gear and/or the frictional force between external gear and floating side plate, not only realize the stable position of ring gear, but also the friction torque in gear pump running can be reduced.
In addition, the gear pump above-mentioned according to the utility model, can also have following additional technical characteristics:
In an embodiment of the present utility model, described rete is macromolecule plastic film, and described rete is formed on the surface of described floating side plate by injection moulding.
In an embodiment of the present utility model, the gap location that described ring gear does not engage with described external gear is provided with swing link, the both side surface of described swing link is equipped with the first position structure, described floating side plate is provided with the second position structure, and described first position structure coordinates with described second position structure locates described swing link.
Further, described first position structure is the positioning convex being formed in described swing link surface, and the described positioning convex of the every side of described swing link includes one or spaced apart multiple, described second position structure is be formed on described floating side plate and corresponding with described positioning convex swing link locating slot, being coupled at least partially in described swing link locating slot of described positioning convex.
In an embodiment of the present utility model, described external gear is located at the medium position of described gear shaft, and the both sides of described external gear are respectively equipped with sliding bearing, and described sliding bearing to be installed on described pumping cylinder and on the outer circumferential face of sheathed described gear shaft.
Advantageously, one end towards described external gear of described sliding bearing to be stretched in corresponding floating side plate and is substantially flushed with the inner side surface of corresponding floating side plate.
In an embodiment of the present utility model, described pumping cylinder comprises: the pump housing, and the described pump housing is formed with through hole; First pump cover and the second pump cover, described first pump cover is located at the both sides of the described pump housing respectively with described second pump cover and limits described inner chamber together with the through hole on the described pump housing, wherein, described ring gear is rotatably set in the described pump housing, is equipped with described floating side plate between described first pump cover and the end face of described gear pair and between described second pump cover and the end face of described gear pair.
Further, described first pump cover and described second pump cover coordinate with described ring gear respectively and compress corresponding described floating side plate.
Advantageously, the surface deviating from described ring gear of described floating side plate is provided with annular boss, described first pump cover and described second pump cover are all formed with the receiving groove for holding corresponding described annular boss, the outer circumferential face of described annular boss is provided with restraining groove, be provided with seal ring in described restraining groove, and described seal ring is given prominence to the outer circumferential face of described annular boss and is against on the inner circle wall of corresponding described receiving groove.
In an embodiment of the present utility model, described floating side plate forms conduction hole, and the engagement place of the contiguous described ring gear of described conduction hole and described external gear.
The utility model also proposed the floating side plate for gear pump, the rete be provided with at least partially for reducing friction on the surface of described floating side plate.There is the same or analogous technique effect with previous embodiment.
Accompanying drawing explanation
Fig. 1 is the sectional view of the gear pump of the utility model embodiment.
Fig. 2 is the schematic diagram of the gear pump of the utility model embodiment.
Fig. 3 and Fig. 4 is the floating side plate schematic diagram in different directions of the gear pump of the utility model embodiment.
Fig. 5 is the sectional view of the floating side plate of the gear pump of another embodiment of the utility model.
Reference character: gear pump 100, pumping cylinder 1, receiving groove 101, the pump housing 11, first pump cover 12, second pump cover 13, ring gear 2, gear shaft 3, external gear 31, floating side plate 4, conduction hole 401, rete 402, restraining groove 403, axis hole 404, the second position structure 41, annular boss 42, swing link 5, the first position structure 51, sliding bearing 6, seal ring 7, oil sealing 81, positioning pin column 82.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Composition graphs 1 to Fig. 5, according to the gear pump 100 of the utility model embodiment, comprising: pumping cylinder 1, ring gear 2, gear shaft 3 and floating side plate 4.
Specifically, be formed with inner chamber (not shown) in pumping cylinder 1, ring gear 2 is rotatably located at (namely in described inner chamber) in pumping cylinder 1.Gear shaft 3 is rotatably located on pumping cylinder 1, gear shaft 3 has external gear 31, external gear 31 to be located at inside ring gear 2 and to engage with ring gear 2, and external gear 31 coordinates formative gear secondary with ring gear 2, and the axis of the axis of external gear 31 and ring gear 2 is biased mutually.Changed by pumping cylinder 1 and the swept volume that formed between intermeshing ring gear 2 and external gear 31 and mobilely carry liquid or make it supercharging.
Floating side plate 4 is located between the inner side surface of described inner chamber and the end face of ring gear 2 and external gear 31, and in other words, floating side plate 4 is located between the inner side surface of described inner chamber and the end face of described gear pair.Floating side plate 4 is provided with the rete 402 for reducing frictional force between floating side plate 4 and described gear pair towards the surface of described gear pair.That is, floating side plate 4 is provided with rete 402 towards the surface of the end face of described ring gear 2 and external gear 31, and this rete 402 is for reducing floating side plate 4 and the frictional force between ring gear 2 and external gear 31.
According to the gear pump 100 of the utility model embodiment, floating side plate 4 is provided with rete 402, thus reduce ring gear 2 and/or the frictional force between external gear 31 and floating side plate 4, not only realize the stable position of ring gear 2, but also the friction torque in gear pump running can be reduced.
In addition, floating side plate 4 is located at ring gear 2 both sides vertically (left and right sides with reference to ring gear 2 in Fig. 1), and floating side plate 4 may be used for locating ring gear 2.
As Fig. 5 and composition graphs 1, in an embodiment of the present utility model, floating side plate 4 is provided with rete 402 towards the surface (right flank with reference to floating side plate 4 in Fig. 5) of ring gear 2, rete 402 is macromolecule plastic film, and rete 402 is formed on the surface of floating side plate 4 by injection moulding.The friction factor of rete 402 is little, further reduces friction torque, and rete 402 is formed on the surface of floating side plate 4 by injection moulding, makes the good stable performance of rete adhesive quality.
In addition, also can adhere to the low material of other friction factor on floating side plate 4, this is easy to obtain for those of ordinary skill in the art.
Composition graphs 1 to Fig. 4, in examples more of the present utility model, the gap location that ring gear 2 does not engage with external gear 31 is provided with swing link 5, the both side surface of swing link 5 is equipped with the first position structure, in other words, the both sides of the axial direction along gear shaft 3 of swing link 5 are (with reference to the left and right sides of swing link 5 in Fig. 1, or with reference to swing link 5 in Fig. 2 perpendicular to the both sides on the direction of paper) be equipped with the first position structure 51 on the surface, floating side plate 4 is provided with the second position structure 41, first position structure 51 and coordinates with the second position structure 41 and locate swing link 5.Realize the stable position of swing link 5 and floating side plate 4.
Further, composition graphs 2 to Fig. 4, first position structure 51 is for being formed in the positioning convex on swing link 5 surface, and the positioning convex of the every side of swing link 5 includes one or spaced apart multiple, second position structure 41 is for being formed on floating side plate 4 and corresponding with positioning convex swing link locating slot, being coupled at least partially in swing link locating slot of positioning convex.Simple and the good positioning effect of position structure.
In addition, can exchange during the position of described positioning convex and locating slot, or adopt in prior art that other can locate other structure or the mode of swing link 5 and floating side plate 4 relative position.
As Fig. 1, in a concrete example of the present utility model, external gear 31 is located at the medium position of gear shaft 3, and the both sides of external gear 31 are respectively equipped with sliding bearing 6, and sliding bearing 6 to be installed on pumping cylinder 1 and on the outer circumferential face of sheathed gear shaft 3.Thus reduce the friction torque of gear pump 100 further.
Further, with reference to Fig. 1, one end of the gear toward the outside 31 of sliding bearing 6 to be stretched in corresponding floating side plate 4 and is substantially flushed with the inner side surface of corresponding floating side plate 4.Add the length of sliding bearing 6, the increase of sliding bearing 6 length, the pv value that sliding bearing 6 can be born increases, and pressure suffered between ring gear and the pump housing will reduce, thus reduces the moment of torsion required for gear pump work.
One of ordinary skill in the art will appreciate that P-sealing-fluid pressure (Mpa); The average slip speed (m/s) of V-seal face.The unit of pv value is Mpam/s.The pv value that mechanical seal can be born is higher, represents that the ability to work of mechanical seal is stronger; Operating mode pv value is higher, represents the load higher (hydrodynamic pressure of Seal cage, rotational line speed) that mechanical seal will carry.
As Fig. 1, in embodiments more of the present utility model, pumping cylinder 1 comprises: the pump housing 11, first pump cover 12 and the second pump cover 13.
Specifically, be formed with through hole (not shown) in the pump housing 11, the side of the pump housing 11 established by the first pump cover 12; Second pump cover 13 is located at the opposite side of the pump housing 11, the both sides of the first pump cover 12 and the second pump cover 13 capping pump housing 11, and the first pump cover 12 limits described inner chamber with the second pump cover 13 together with the through hole of the pump housing 11, wherein, ring gear 2 is rotatably set in the pump housing 11, that is, is formed with through hole in the pump housing 11, ring gear 2 is rotatably set in this through hole, and the two ends of the first pump cover 12 and the second pump cover 13 difference capping through hole.Floating side plate 4 is equipped with between first pump cover 12 and the end face of described gear pair and between the second pump cover 13 and the end face of described gear pair.
External gear 31 is located at the middle part of gear shaft 3, and a part for gear shaft 3 is rotatably set in the first pump cover 12 and the second pump cover 13.Make pumping cylinder 1 structure simple, easy to assembly, thus improve the efficiency of assembling of gear pump.
Further, the first pump cover 12 and the second pump cover 13 coordinate with ring gear 2 respectively and compress corresponding floating side plate 4.Thus by floating side plate 4 stable position ring gear 2.
Preferably, composition graphs 1 to Fig. 5, the surface deviating from ring gear 2 of floating side plate 4 is provided with annular boss 42, first pump cover 12 and the second pump cover 13 are all formed with the receiving groove 101 for holding corresponding annular boss 42, the outer circumferential face of annular boss 42 is provided with restraining groove 403, be provided with seal ring 7 in restraining groove 403, and seal ring 7 is given prominence to the outer circumferential face of annular boss 42 and is against on the inner circle wall of corresponding receiving groove 101.Thus make the good seal performance between floating side plate 4 and pumping cylinder 1.
As shown in Figure 3 and Figure 4, floating side plate 4 is formed conduction hole 401, and the engagement place of the contiguous ring gear 2 of conduction hole 401 and external gear 31.In gear pump running, fluid can deviate from the side of ring gear 2 and external gear 31 by conduction hole 401 runner floating side plate 4, thus provides pressure to floating side plate 4, more stable to make gear pump run.
Composition graphs 1 to Fig. 5, the utility model also proposed a kind of floating side plate 4 for gear pump, the middle part of floating side plate 4 is provided with the axis hole 404 passed for gear shaft 3, and the rete 402 be provided with at least partially for reducing friction on the surface of floating side plate 4.This floating side plate 4 can be arranged on gear pump, to improve gear pump performance.
Gear pump of the present utility model mainly refers to lowly force down torque gear pump, certainly, also can be applied to other forms of gear pump, such as high-pressure gear pump.
As depicted in figs. 1 and 2, a kind of gear pump 100 described by the utility model comprises gear shaft 3, oil sealing 81, first pump cover 12, positioning pin column 82, the pump housing 11, second pump cover 13, ring gear 2, floating side plate 4, sliding bearing 6, swing link 5.Gear pump 100 involved by the utility model belongs to low pressure gear pump, and the radial seal of this gear pump 100 only relies on ring gear 2, fitting tightly between gear shaft 3 and swing link 5 just can realize, and axial seal relies on floating side plate 4 to complete.As Fig. 3 to Fig. 5, the surface of floating side plate 4 is provided with rete 402, and the main body of floating side plate 4 is made by stainless steel, and rete 402 is made by wear-resistant macromolecule plastics (i.e. PEEK).Because PEEK layer has lower friction factor, when gear pump 100 works, between gear pair and floating side plate 4, not only leakage rate is few, and the moment of torsion that gear pair and floating side plate 4 produce required for relative movement also can be lower.Floating side plate 4 relies on sliding bearing 6 and swing link 5 to realize location, floating side plate 4 has the side of annular boss 42 and the receiving groove 101 groove Spielpassung of the first pump cover 12 and the second pump cover 13, and the effect of O type circle (i.e. seal ring 7) prevents from flowing to hydraulic oil in receiving groove 101 by the clearance leakage between annular boss 42 and receiving groove 101 out.When flowing through waist type groove (i.e. the conduction hole 401) on floating side plate 4 when hydraulic oil, hydraulic oil enters in receiving groove 101 through waist type concentrated flow, due to the seal action of O type circle on floating side plate 4, the hydraulic oil with certain pressure can promote the end face that floating side plate 4 is close to gear pair, thus achieves axial seal.The floating side plate 4 increased in this model utility, can under the prerequisite not affecting gear pump performance, increase the length of sliding bearing 6, the increase of sliding bearing 6 length, pv value suffered by sliding bearing 6 is increased, and pressure suffered between ring gear 2 and the pump housing 11 will reduce, thus reduce gear pump 100 and to work required moment of torsion.
Floating side plate 4 structure increased in the utility model, not only avoid the direct wearing and tearing between gear pair and pump cover, due to the special construction of floating side plate 4, also reduce input torque required when gear pump 100 works, in addition, nose balance structure in this model utility can meet the compensation compared with wide arc gap, and gear pump 100 life-span is increased.This floating lining plate structure is simple, and needed for injection mould, expense is lower.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristics.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In description of the present utility model, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the utility model, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the utility model can be understood as the case may be.
In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and described embodiment of the present utility model above, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art can change above-described embodiment, revises, replace and modification in scope of the present utility model.
Claims (11)
1. a gear pump, is characterized in that, comprising:
Pumping cylinder, is formed with inner chamber in described pumping cylinder;
Ring gear, described ring gear is rotatably located in described inner chamber;
Gear shaft, described gear shaft is rotatably located on described pumping cylinder, described gear shaft has external gear, and described external gear is located to engage inside described ring gear and with described ring gear and forms gear pair, and the axis of the axis of described external gear and described ring gear is biased mutually;
Floating side plate, described floating side plate is located between the inner side surface of described inner chamber and the end face of described gear pair, and the surface towards described gear pair of described floating side plate is provided with the rete for reducing frictional force between described floating side plate and gear pair.
2. gear pump according to claim 1, is characterized in that, described rete is macromolecule plastic film, and described rete is formed on the surface of described floating side plate by injection moulding.
3. gear pump according to claim 1, it is characterized in that, the gap location that described ring gear does not engage with described external gear is provided with swing link, the both side surface of described swing link is equipped with the first position structure, described floating side plate is provided with the second position structure, and described first position structure coordinates with described second position structure locates described swing link.
4. gear pump according to claim 3, it is characterized in that, described first position structure is the positioning convex being formed in described swing link surface, and the described positioning convex of the every side of described swing link includes one or spaced apart multiple, described second position structure is be formed on described floating side plate and corresponding with described positioning convex swing link locating slot, being coupled at least partially in described swing link locating slot of described positioning convex.
5. the gear pump according to any one of claim 1-4, it is characterized in that, described external gear is located at the medium position of described gear shaft, and the both sides of described external gear are respectively equipped with sliding bearing, and described sliding bearing to be installed on described pumping cylinder and on the outer circumferential face of sheathed described gear shaft.
6. gear pump according to claim 5, is characterized in that, one end towards described external gear of described sliding bearing to be stretched in corresponding floating side plate and substantially flushed with the inner side surface of corresponding floating side plate.
7. the gear pump according to any one of claim 1-4, is characterized in that, described pumping cylinder comprises:
The pump housing, the described pump housing is formed with through hole;
First pump cover and the second pump cover, described first pump cover is located at the both sides of the described pump housing respectively with described second pump cover and limits described inner chamber together with the through hole of the pump housing,
Wherein, described ring gear is rotatably set in the described pump housing, is equipped with described floating side plate between described first pump cover and the end face of described gear pair and between described second pump cover and the end face of described gear pair.
8. gear pump according to claim 7, is characterized in that, described first pump cover and described second pump cover coordinate with described ring gear respectively and compress corresponding described floating side plate.
9. gear pump according to claim 7, it is characterized in that, the surface deviating from described ring gear of described floating side plate is provided with annular boss, described first pump cover and described second pump cover are all formed with the receiving groove for holding corresponding described annular boss, the outer circumferential face of described annular boss is provided with restraining groove, be provided with seal ring in described restraining groove, and described seal ring is given prominence to the outer circumferential face of described annular boss and is against on the inner circle wall of corresponding described receiving groove.
10. the gear pump according to any one of claim 1-4, is characterized in that, described floating side plate forms conduction hole, and the engagement place of the contiguous described ring gear of described conduction hole and described external gear.
11. 1 kinds, for the floating side plate of gear pump, is characterized in that, the rete be provided with at least partially for reducing friction on the surface of described floating side plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520663926.9U CN205013275U (en) | 2015-08-28 | 2015-08-28 | Gear pump and be used for unsteady curb plate of gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520663926.9U CN205013275U (en) | 2015-08-28 | 2015-08-28 | Gear pump and be used for unsteady curb plate of gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205013275U true CN205013275U (en) | 2016-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520663926.9U Active CN205013275U (en) | 2015-08-28 | 2015-08-28 | Gear pump and be used for unsteady curb plate of gear pump |
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| Country | Link |
|---|---|
| CN (1) | CN205013275U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762609A (en) * | 2016-11-29 | 2017-05-31 | 西安航天动力研究所 | A kind of high-tension shielding Gerotor pump |
| CN114962252A (en) * | 2022-04-20 | 2022-08-30 | 宁波安信数控技术有限公司 | Electric gear pump |
-
2015
- 2015-08-28 CN CN201520663926.9U patent/CN205013275U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762609A (en) * | 2016-11-29 | 2017-05-31 | 西安航天动力研究所 | A kind of high-tension shielding Gerotor pump |
| CN106762609B (en) * | 2016-11-29 | 2018-06-01 | 西安航天动力研究所 | A kind of high-tension shielding Gerotor pump |
| CN114962252A (en) * | 2022-04-20 | 2022-08-30 | 宁波安信数控技术有限公司 | Electric gear pump |
| CN114962252B (en) * | 2022-04-20 | 2024-03-26 | 宁波安信数控技术有限公司 | Electric gear pump |
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