CN203035541U - Pressure maintaining gear pump - Google Patents
Pressure maintaining gear pump Download PDFInfo
- Publication number
- CN203035541U CN203035541U CN 201220543221 CN201220543221U CN203035541U CN 203035541 U CN203035541 U CN 203035541U CN 201220543221 CN201220543221 CN 201220543221 CN 201220543221 U CN201220543221 U CN 201220543221U CN 203035541 U CN203035541 U CN 203035541U
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- slidingly matched
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- driven shaft
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Abstract
The utility model discloses a pressure maintaining gear pump which comprises a driving shaft, a right driven shaft, a left driven shaft, a master gear, a right driven gear, a left driven gear, a front outer end cover, a rear outer end cover, a middle ring strip spring, a right ring strip spring, a left ring strip spring and a pump body, and is characterized in that two arcs in the center of an inner cavity of the pump body are slidingly matched with an excircle of the master gear; a right large half arc of the inner cavity of the pump body is slidingly matched with an excircle of the right driven gear; a left large half arc of the inner cavity of the pump body is slidingly matched with an excircle of the left driven gear; the driving shaft in the center of the master gear is parallel to the right driven shaft in the center of the right driven gear and to the left driven shaft in the center of the left driven gear; a rear cover inner plane of the rear outer end cover is fixed on the rear end face of the pump body in a sealing manner; a front cover inner plane of the front outer end cover is fixed on the front end face of the pump body in a sealing manner; a frontal plane of an end face compensation disc is clung to the master gear, the right driven gear and the left driven gear simultaneously; and the middle ring strip spring, the right ring strip spring and the left ring strip spring are arranged between the back surface of the end face compensation disc and an inner side plane of the front outer end cover respectively.
Description
Technical field
The utility model belongs to mechanical engineering field, and International Classification of Patents is the F04D non-varactor pump, relate to a kind of with mechanical energy be converted to fluid pressure can the transformation of energy rotary volume pump, refer to a kind of pressurize gear pump especially.
Background technique
Known gear pump all is that the mated gear pump is being worked, because inlet outlet pressure differential is bigger, certainly will cause gear one-sided stressed, particularly driving gear is one-sided stressed, directly cause the driving gear shaft place uneven wear of going ahead of the rest to reveal, cause the gear pump life-span short, boost in pressure is restricted.Perplex gear pump always and can not get effective problem that solves in addition: behind the long-term high speed operation, must wearing and tearing of its end face can not get effective compensation.China's license notification number: CN1059019C pendulum rotary vane pump; China's license notification number: CN100374725C rotating vane pump; China's license notification number: the arc toothed mesohigh gear pump of CN1316162C asymmetric double; The internal gear pump of China's license notification number: CN1081750C band plastic shell; China's license notification number: CN101120175B and China's license notification number: a CN101403382B gear pump for micro-miniature turbojet engine etc. there is no practicable method and solve the stressed asymmetric of gear pump and end wear gap control problem.
Summary of the invention
The purpose of this utility model provides a kind of pressurize gear pump, adopts the stressed structure of driving gear symmetry and end wear to compensate isolation technology, to realize the technological gap that symmetry is stressed and end wear compensates automatically simultaneously.
To achieve these goals, the utility model provides following technological scheme:
A kind of pressurize gear pump, comprise driving shaft, right driven shaft, left driven shaft, master gear, right from gear, a left side from gear, preceding outer end cap, back outer end cap, ring bar spring, right ring bar spring, left side ring bar spring, the pump housing, as improvement: the two sections arcs in the center of described pump housing inner chamber and master gear cylindrical are slidingly matched; Right more than half circular arc of described pump housing inner chamber is slidingly matched from top circle with right; The more than half circular arc in the left side of described pump housing inner chamber is slidingly matched from top circle with a left side; The driving shaft at described master gear center parallels with the right driven shaft of the described right side from Gear center; The driving shaft at described master gear center parallels with the left driven shaft of a described left side from Gear center; 4 to 12 rear end cover screws are fixed on described pump housing ear end face from the bonnet counterbore with the bonnet inner plane of described back outer end cap is airtight; The front cover screw is fixed on described pump housing front-end face from the protecgulum counterbore with the protecgulum inner plane of outer end cap before described is airtight after 4 to 12; Described end-face compensate dish horizontal frontal plane is pasting master gear and right from gear and left from gear simultaneously; The described end-face compensate dish back side and described before the outer end cap inner side plane with between have respectively in ring bar spring and right ring bar spring and a left side encircle the bar spring.
As further improvement: described master gear equates from the gear width from gear and a left side that with right described master gear is spent at a distance of 180 from the engagement of gear locking phase from gear and a left side with right.
As further improvement: described bonnet inner plane pasting simultaneously master gear and right from gear and a left side from the ear end face of gear; Back through hole and driving shaft rear end section were slidingly matched during described bonnet inner plane had; Described bonnet inner plane has the right blind hole in back and right driven shaft rear end section to be slidingly matched; Described bonnet inner plane has the left blind hole in back and right driven shaft rear end section to be slidingly matched.
As further improvement: described end-face compensate dish horizontal frontal plane pasting simultaneously master gear and right from gear and a left side from the front-end face of gear; Ring bar spring ring-type chassis in having in the dish scrobicular ring isolate on the described end-face compensate dish back side respectively to fix is coiled right scrobicular ring and is isolated and fixing right ring bar spring ring-type chassis, and the scrobicular ring of facing left is isolated and fixed ring bar spring ring-type chassis, a left side.
As further improvement: ring bar spring and right ring bar spring and ring bar spring spoke top, a left side during described protecgulum inner plane is pasting simultaneously; Have on the described protecgulum inner plane seal ring before the band in before through hole and driving shaft front end rigion be slidingly matched, the driving shaft front end rigion passes through outside preceding outer end cap and has located main shaft key; Right blind hole and right driven shaft front end rigion were slidingly matched before described protecgulum inner plane had, bottom surface, right hole before not contacting; Left blind hole and right driven shaft front end rigion were slidingly matched before described protecgulum inner plane had, bottom surface, left hole before not contacting.
As further improvement: have middle back through hole and the driving shaft rear end section of band back seal ring to be slidingly matched on the described bonnet inner plane; Described bonnet inner plane has the right blind hole in back and right driven shaft rear end section to be slidingly matched, and does not contact bottom surface, right hole, back; Described bonnet inner plane has the left blind hole in back and right driven shaft rear end section to be slidingly matched, and does not contact bottom surface, left hole, back.
As further improvement: the middle-end section was slidingly matched before described end-face compensate dish had compensating disc mesopore and driving shaft; The middle-end section was slidingly matched before described end-face compensate dish had the right hole of compensating disc and right driven shaft; Described end-face compensate dish has the compensation preceding middle-end section of hole and left driven shaft of facing left to be slidingly matched; Two sections arcs of the disk center that described end-face compensate dish is placed outward, the right outlet of dish arc, the right import arc of dish, the outlet arc of facing left, face left import arc and the right more than half circular arc of dish, more than half circular arc of facing left are slidingly matched with the two sections arcs in center, the right outlet of body arc, the right import arc of body, body left side outlet arc, body left side import arc and the right more than half circular arc of body, the body left side outlet arc of described pump housing inner chamber respectively.
As further improvement: the right outlet of described body arc is connected with right export pipeline; The right import arc of described body is connected with right inlet ductwork; Described body left side outlet arc is connected with left export pipeline; Described body left side import arc is connected with left inlet ductwork.
The beneficial effects of the utility model are: adopt three gears to reach the compact structure of twice flow, make be positioned in the middle of the stressed complete equilibrium that obtains of master gear symmetry, guarantee that unique main gear shaft long-time running that is in the motive sealing sealing state do not have wearing and tearing.It is much no matter to pass in and out pipeline pressure reduction, master gear meshes from the gear locking phase from gear and a left side with right at a distance of 180 degree, the overall stressed complete equilibrium that obtains of master gear, wearing and tearing also fully symmetrically and evenly, can keep master gear and right from gear and a left side from leaking in the long-time pressurize operation between the gear, and guarantee seal ring before the band on driving shaft and the protecgulum inner plane in before the long-time effective sealing of through hole do not leak outside.
Encircle the axial rebounding force that the bar spring produces by means of middle ring bar spring and right ring bar spring and a left side, make the horizontal frontal plane of end-face compensate dish be close to master gear and right from gear and left front-end face from gear simultaneously, force master gear and the right side to be close to the bonnet inner plane from gear and a left side from the ear end face of gear, guarantee that the utility model is in high-efficiency operation all the time.The utility model realizes also possessing radial force balancing technique and axial end wear compensation gap control technology simultaneously, and is novel, simple in structure, the convenient manufacturing, and the market application potential is huge.
Description of drawings
Fig. 1 is the whole sectional drawing by three main axiss of the utility model;
Fig. 2 is the P-P sectional view among Fig. 1;
Fig. 3 is the sectional view in Q-Q cross section among Fig. 1;
Fig. 4 is the back side stereogram of the end-face compensate dish 40 among Fig. 1;
Fig. 5 is R-R sectional view among Fig. 3.
Embodiment
In conjunction with the accompanying drawings and embodiments, further structure of the present utility model and working principle are elaborated:
A kind of pressurize gear pump, comprise driving shaft 11, right driven shaft 12, left driven shaft 13, master gear 21, right from gear 22, a left side from gear 23, preceding outer end cap 50, back outer end cap 70, ring bar spring 81, right ring bar spring 82, left side ring bar spring 83, the pump housing 90, as improvement: the two sections arcs in center 91 on the described pump housing 90 inner chambers are slidingly matched with master gear 21 cylindricals; Right more than half circular arc 92 on the described pump housing 90 inner chambers is slidingly matched from gear 22 cylindricals with right; The more than half circular arc 92 in a left side on the described pump housing 90 inner chambers is slidingly matched from gear 23 cylindricals with a left side; The driving shaft 11 at described master gear 21 centers parallels with the right driven shaft 12 of the described right side from gear 22 centers; The driving shaft 11 at described master gear 21 centers parallels with the left driven shaft 13 of a described left side from gear 23 centers; 4 to 12 rear end cover screws 40 are from bonnet inner plane 79 airtight the be fixed on described pump housing after 90s end faces of bonnet counterbore 76 with described back outer end cap 70; Front cover screw 60 is fixed on the described pump housing 90 front-end faces from protecgulum counterbore 56 with the protecgulum inner plane 59 of outer end cap 50 before described is airtight after 4 to 12; Described end-face compensate dish 30 horizontal frontal planes are pasting master gear 21 and right from gear 22 and left from gear 23 simultaneously; Described end-face compensate dish 30 back sides and described before outer end cap 50 inner side plane with between have respectively in ring bar spring 81 and right ring bar spring 82 and a left side encircle bar spring 83.
As further improvement: described master gear 21 equates from gear 23 width from gear 22 and a left side that with right described master gear 21 is spent at a distance of 180 from the engagement of gear 23 locking phases from gear 22 and a left side with right.
As further improvement: described bonnet inner plane 79 pasting simultaneously master gear 21 and right from gear 22 and a left side from the ear end face of gear 23; Back through hole 71 was slidingly matched with driving shaft 11 rear end section during described bonnet inner plane 79 had; Described bonnet inner plane 79 has the right blind hole 72 in back to be slidingly matched with right driven shaft 12 rear end section; Described bonnet inner plane 79 has the left blind hole 73 in back to be slidingly matched with right driven shaft 13 rear end section.
As further improvement: described end-face compensate dish 30 horizontal frontal planes pasting simultaneously master gear 21 and right from gear 22 and a left side from the front-end face of gear 23; Ring bar spring 81 ring-type chassis in having in the dish scrobicular ring 37 isolate on described end-face compensate dish 30 back sides respectively to fix are coiled right scrobicular ring 38 and are isolated and fixing right ring bar spring 82 ring-type chassis, and the scrobicular ring 39 of facing left is isolated and fixed ring bar spring 83 ring-type chassis, a left side.
As further improvement: ring bar spring 81 and right ring bar spring 82 and ring bar spring 83 spoke tops, a left side during described protecgulum inner plane 59 is pasting simultaneously; Have on the described protecgulum inner plane 59 seal ring 61 before the band in before through hole 51 be slidingly matched with driving shaft 11 front end rigions, driving shaft 11 front end rigions pass through outside preceding outer end cap 50 and have located main shaft key 17; Right blind hole 52 was slidingly matched with right driven shaft 12 front end rigions before described protecgulum inner plane 59 had, bottom surface, right hole 62 before not contacting; Left blind hole 53 was slidingly matched with right driven shaft 13 front end rigions before described protecgulum inner plane 59 had, bottom surface, left hole 63 before not contacting.
As further improvement: there is the middle back through hole 71 of band back seal ring 41 to be slidingly matched with driving shaft 11 rear end section on the described bonnet inner plane 79; Described bonnet inner plane 79 has the right blind hole 72 in back to be slidingly matched with right driven shaft 12 rear end section, does not contact bottom surface, right hole, back 42; Described bonnet inner plane 79 has the left blind hole 73 in back to be slidingly matched with right driven shaft 13 rear end section, does not contact bottom surface, left hole, back 43.
As further improvement: the middle-end sections were slidingly matched before described end-face compensate dish 30 had compensating disc mesopore 31 and driving shaft 11; Described end-face compensate dish 30 has the right hole 32 of compensating disc and right driven shaft 12 preceding middle-end sections to be slidingly matched; Described end-face compensate dish 30 has compensation to face left, and the middle-end sections are slidingly matched before hole 33 and the left driven shaft 13; Described end-face compensate dish 30 outer two sections arcs 34 of disk center of placing, the right outlet of dish arc 69, the right import arc 67 of dish, the outlet arc 66 of facing left, face left import arc 68 and the right more than half circular arc 35 of dish, face left more than half circular arc 36 respectively with the described pump housing 90 inner chambers on the two sections arcs 91 in center, the right outlet of body arc 89, the right import arc 87 of body, body left side outlet arc 86, body left side import arc 88 and the right more than half circular arc 92 of body, body left side outlet arc 93 be slidingly matched.
As further improvement: the right outlet of described body arc 89 is connected with right export pipeline 49; The right import arc 87 of described body is connected with right inlet ductwork 47; Described body left side outlet arc 86 is connected with left export pipeline 46; Described body left side import arc 88 is connected with left inlet ductwork 48.
Embodiment's installation steps and working principle are described as follows:
Installation steps:
In Fig. 1, it is 17 numbers of teeth that embodiment selects master gear 21, and right respectively is 17 numbers of teeth from gear 22 and a left side from gear 23.8 rear end cover screws 40 place the bonnet pad 78 airtight described pump housing end faces after 90s that are fixed on from bonnet counterbore 76 with the described bonnet inner plane 79 of outer end cap 70 afterwards.
The middle back through hole 71 that bonnet inner plane 79 is inserted in driving shaft 11 rear ends passes seal ring 41 and outer stretching in the back, right driven shaft 12 rear ends are inserted the back right blind hole 72 of bonnet inner plane 79 but are not contacted bottom surface, right hole, back 42, and right driven shaft 13 rear ends are inserted the back left blind hole 73 of bonnet inner plane 79 but do not contacted bottom surface, left hole, back 43.
End-face compensate dish 30 horizontal frontal planes are being pasted master gear 21 and right from gear 22 and left front-end face from gear 23 simultaneously.The compensating disc mesopore 31 of end-face compensate dish 30 is slidingly matched with driving shaft 11 preceding middle-end sections, the middle-end sections are slidingly matched before the right hole 32 of the compensating disc of end-face compensate dish 30 and the right driven shaft 12, and the compensation of end-face compensate dish 30 is faced left, and the middle-end sections are slidingly matched before hole 33 and the left driven shaft 13.
The middle back through hole 71 of band back seal ring 41 on the bonnet inner plane 79 of back outer end cap 70 is slidingly matched with driving shaft 11 rear end section; Back right blind hole 72 and right driven shaft 12 rear end section of bonnet inner plane 79 are slidingly matched, and do not contact bottom surface, right hole, back 42; Back left blind hole 73 and right driven shaft 13 rear end section of bonnet inner plane 79 are slidingly matched, and do not contact bottom surface, left hole, back 43.
From protecgulum counterbore 56 the protecgulum inner plane 59 of outer end cap 50 before described is placed with 8 rear end cover screws 60 that protecgulum pad 58 is airtight to be fixed on the described pump housing 90 front-end faces.Make protecgulum inner plane 59 paste middle ring bar spring 81 and right ring bar spring 82 and left ring bar spring 83 spoke tops simultaneously, install.
Working principle:
External force is turned clockwise by driving shaft 11 related master gears 21 by main shaft key 17 inputs among the embodiment, is meshing with each other synchronously from gear 23 from gear 22 and a left side by master gear 21 and the right side, orders about right from gear 22 and left from gear 23 opposite spins.Right inlet ductwork 47 and left inlet ductwork 48 be feed liquor simultaneously, and right export pipeline 49 and left export pipeline 46 be fluid simultaneously.
It is much no matter to pass in and out pipeline pressure reduction, master gear 21 meshes from gear 23 locking phases from gear 22 and a left side with right at a distance of 180 degree, the master gear 21 overall stressed complete equilibriums that obtain, wearing and tearing also fully symmetrically and evenly, can keep master gear 21 and right from gear 22 and a left side from leaking in the long-time pressurize operation between the gear 23, and guarantee seal ring 61 before the band on driving shaft 11 and the protecgulum inner plane 59 in before through hole 51 long-time effectively sealings do not leak outside.
The right side is revolved to turn around from gear 22 liquid of right inlet ductwork 47 is sent into right export pipeline 49; A left side is revolved to turn around from gear 23 liquid of left inlet ductwork 48 is sent into left export pipeline 46, goes round and begins again.
After long-time running, master gear 21 and right from gear 22 and left both ends of the surface wearing and tearing from gear 23, can use have in the dish scrobicular ring 37 isolate on end-face compensate dish 30 back sides respectively to fix in ring bar spring 81 ring-type chassis, coil right scrobicular ring 38 isolation and fixing right ring bar spring 82 ring-type chassis, scrobicular ring 39 isolation of facing left are being fixed a left side and are being encircled bar spring 83 ring-type chassis.Utilize protecgulum inner plane 59 pasting the rebounding force that middle ring bar spring 81 and right ring bar spring 82 and left ring bar spring 83 spoke tops produce simultaneously, force end-face compensate dish 30 horizontal frontal planes pasting master gear 21 and right from gear 22 and left front-end face from gear 23 simultaneously, then force master gear 21 and right from gear 22 and the left bonnet inner plane 79 that is pasting back outer end cap 70 from the ear end face of gear 23 simultaneously, guarantee not take place between the long-play ear end face internal leakage, realize high-voltage operation.
Claims (8)
1. pressurize gear pump, comprise driving shaft (11), right driven shaft (12), left driven shaft (13), master gear (21), right from gear (22), a left side from gear (23), preceding outer end cap (50), back outer end cap (70), ring bar spring (81), right ring bar spring (82), left side ring bar spring (83), the pump housing (90), it is characterized in that: the two sections arcs in center (91) on the described pump housing (90) inner chamber are slidingly matched with master gear (21) cylindrical; Right more than half circular arc (92) on the described pump housing (90) inner chamber is slidingly matched from gear (22) cylindrical with right; The more than half circular arc (93) in a left side on the described pump housing (90) inner chamber is slidingly matched from gear (23) cylindrical with a left side; The driving shaft (11) at described master gear (21) center parallels with the right driven shaft (12) of the described right side from gear (22) center; The driving shaft (11) at described master gear (21) center parallels with the left driven shaft (13) of a described left side from gear (23) center; 4 to 12 rear end cover screws (40) are from bonnet inner plane (79) airtight the be fixed on described pump housing (90) ear end face of bonnet counterbore (76) with described back outer end cap (70); Front cover screw (60) is from protecgulum inner plane (59) airtight the be fixed on described pump housing (90) front-end face of protecgulum counterbore (56) with outer end cap (50) before described after 4 to 12; Described end-face compensate dish (30) horizontal frontal plane is pasting master gear (21) and right from gear (22) and left from gear (23) simultaneously; Described end-face compensate dish (30) back side and described before outer end cap (50) inner side plane with between have respectively in ring bar spring (81) and right ring bar spring (82) and the left bar spring (83) that encircles.
2. a kind of pressurize gear pump according to claim 1 is characterized in that: described master gear (21) equates from gear (23) width from gear (22) and a left side with right; Described master gear (21) meshes at a distance of 180 degree from gear (23) locking phase from gear (22) and a left side with right.
3. a kind of pressurize gear pump according to claim 1 is characterized in that: described bonnet inner plane (79) pasting simultaneously master gear (21) and right from gear (22) and a left side from the ear end face of gear (23); Back through hole (71) was slidingly matched with driving shaft (11) rear end section during described bonnet inner plane (79) had; Described bonnet inner plane (79) has the right blind hole in back (72) and right driven shaft (12) rear end section to be slidingly matched; Described bonnet inner plane (79) has the left blind hole in back (73) and right driven shaft (13) rear end section to be slidingly matched.
4. a kind of pressurize gear pump according to claim 1 is characterized in that: described end-face compensate dish (30) horizontal frontal plane pasting simultaneously master gear (21) and right from gear (22) and a left side from the front-end face of gear (23); There is scrobicular ring in the dish (37) to isolate on described end-face compensate dish (30) back side respectively and fixing middle ring bar spring (81) ring-type chassis, coil right scrobicular ring (38) isolation and fixing right ring bar spring (82) ring-type chassis, the scrobicular ring of facing left (39) isolation is being fixed a left side and is being encircled bar spring (83) ring-type chassis.
5. a kind of pressurize gear pump according to claim 1 is characterized in that: ring bar spring (81) and right ring bar spring (82) and ring bar spring (83) spoke top, a left side during described protecgulum inner plane (59) is pasting simultaneously; Have on the described protecgulum inner plane (59) seal ring (61) before the band in before through hole (51) and driving shaft (11) front end rigion be slidingly matched, driving shaft (11) front end rigion passes through and located main shaft key (17) outside preceding outer end cap (50); Right blind hole (52) was slidingly matched with right driven shaft (12) front end rigion before described protecgulum inner plane (59) had, bottom surface, right hole (62) before not contacting; Left blind hole (53) was slidingly matched with right driven shaft (13) front end rigion before described protecgulum inner plane (59) had, bottom surface, left hole (63) before not contacting.
6. a kind of pressurize gear pump according to claim 1 is characterized in that: have the middle back through hole (71) of band back seal ring (41) to be slidingly matched with driving shaft (11) rear end section on the described bonnet inner plane (79); Described bonnet inner plane (79) has the right blind hole in back (72) and right driven shaft (12) rear end section to be slidingly matched, and does not contact bottom surface, right hole (42), back; Described bonnet inner plane (79) has the left blind hole in back (73) and right driven shaft (13) rear end section to be slidingly matched, and does not contact bottom surface, left hole (43), back.
7. a kind of pressurize gear pump according to claim 1 is characterized in that: described end-face compensate dish (30) has compensating disc mesopore (31) and the preceding middle-end section of driving shaft (11) to be slidingly matched; Described end-face compensate dish (30) has the right hole of compensating disc (32) and the preceding middle-end section of right driven shaft (12) to be slidingly matched; Described end-face compensate dish (30) has face left hole (33) and the preceding middle-end section of left driven shaft (13) of compensation to be slidingly matched; The outer two sections arcs of disk center (34) placed of described end-face compensate dish (30), the right outlet of dish arc (69), coil right import arc (67), face left and export arc (66), face left import arc (68) and the right more than half circular arc (35) of dish, face left more than half circular arc (36) respectively with the described pump housing (90) inner chamber on the two sections arcs in center (91), the right outlet of body arc (89), the right import arc (87) of body, body left side outlet arc (86), the right more than half circular arc (92) of body left side import arc (88) and body, body left side outlet arc (93) is slidingly matched.
8. a kind of pressurize gear pump according to claim 7 is characterized in that: described body right outlet arc (89) is connected with right export pipeline (49); The right import arc of described body (87) is connected with right inlet ductwork (47); Described body left side outlet arc (86) is connected with left export pipeline (46); Described body left side import arc (88) is connected with left inlet ductwork (48).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220543221 CN203035541U (en) | 2012-10-04 | 2012-10-04 | Pressure maintaining gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220543221 CN203035541U (en) | 2012-10-04 | 2012-10-04 | Pressure maintaining gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203035541U true CN203035541U (en) | 2013-07-03 |
Family
ID=48687671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220543221 Expired - Fee Related CN203035541U (en) | 2012-10-04 | 2012-10-04 | Pressure maintaining gear pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203035541U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878072A (en) * | 2012-10-04 | 2013-01-16 | 张意立 | Pressure holding gear pump |
-
2012
- 2012-10-04 CN CN 201220543221 patent/CN203035541U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878072A (en) * | 2012-10-04 | 2013-01-16 | 张意立 | Pressure holding gear pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20161004 |
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| CF01 | Termination of patent right due to non-payment of annual fee |