CN212466832U - Non-impeller rotor valveless pump for artificial heart - Google Patents
Non-impeller rotor valveless pump for artificial heart Download PDFInfo
- Publication number
- CN212466832U CN212466832U CN202020519641.9U CN202020519641U CN212466832U CN 212466832 U CN212466832 U CN 212466832U CN 202020519641 U CN202020519641 U CN 202020519641U CN 212466832 U CN212466832 U CN 212466832U
- Authority
- CN
- China
- Prior art keywords
- rotor
- shell
- wall
- pump
- bearing
- 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.)
- Active
Links
Images
Abstract
The utility model provides a non-impeller rotor valveless pump for artificial heart, which comprises a pump shell, wherein the cross section outline of the inner wall surface of the shell is oblong, a first rotor and a second rotor are two cylinders with equal diameters, the first rotor and the second rotor are arranged in the pump shell in parallel, and an eccentric distance is arranged between the axis of the first rotor and the first axis of the inner wall of the shell; the first end cover and the second end cover are respectively arranged at two ends of the pump shell, so that a closed cavity is formed in the pump shell, two ends of the first rotor are supported on the first end cover and the second end cover through a first bearing and a second bearing, the first rotor can freely rotate, shoulders at two ends of the first rotor are respectively pressed on inner rings of the first bearing and the second bearing, outer rings of the first bearing and the second bearing are respectively pressed on the shoulders on the first end cover and the second end cover, and the axial positioning of the first rotor is realized; by applying the technical scheme, the advantages of simple motion form, compact structure, good stress condition of parts and long service life can be realized.
Description
Technical Field
The utility model relates to the technical field of fluid machinery, in particular to a non-impeller rotor valveless pump for artificial heart.
Background
The artificial heart is a mechatronic device which can be implanted into a human body to replace the heart to maintain normal blood circulation of the human body, and is one of the main technical means for treating heart failure at present. The existing artificial heart pump can be divided into a pulse type pump and a continuous flow type pump according to the characteristics of output blood flow, wherein the pulse type pump can intermittently pump blood according to a certain frequency, is consistent with the natural physiological characteristics of a human body, but has the defects of large volume, complex structure and easy fatigue damage of parts, and the pump is earlier, but is applied less at present; the continuous flow pump can continuously output blood at a certain speed, a one-way valve for controlling the blood flow direction is not needed in the pump, and the structure is simpler. Most of the existing continuous flow pumps are centrifugal pumps, and blood flows in from an inlet in the center of the pump and is pumped out from an outlet at the periphery of a pump shell under the centrifugal action. The centrifugal heart pump casing has simple structure, but the rotor is mostly of an impeller type structure, and the rotor is not too small in order to ensure good working performance and enough strength, so that the miniaturization of the centrifugal heart pump is limited. Furthermore, the blood is subject to the risk of degeneration, both by mechanical movement of the impeller and by centrifugal movement, which may lead to thrombosis or haemolysis.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a non-impeller rotor valveless pump for artificial heart realizes that the motion form is simple, compact structure, and part atress situation is good, long service life's advantage.
In order to solve the technical problem, the utility model provides a non-impeller rotor valveless pump for artificial heart, which comprises a pump shell, wherein the cross section outline of the inner wall surface of the shell is oblong;
the first rotor and the second rotor are two cylinders with equal diameters, the first rotor and the second rotor are arranged in the pump shell in parallel, the axes of the first rotor and the second rotor are parallel to a first axis of the inner wall of the shell and a second axis of the inner wall of the shell, an eccentric distance is arranged between the axis of the first rotor and the first axis of the inner wall of the shell, and an eccentric distance is also arranged between the axis of the second rotor and the second axis of the inner wall of the shell;
the first end cover and the second end cover are respectively arranged at two ends of the pump shell, so that a closed cavity is formed in the pump shell, two ends of the first rotor are respectively supported on the first end cover and the second end cover through the first bearing and the second bearing, the first rotor can freely rotate, shoulders at two ends of the first rotor are respectively pressed on inner rings of the first bearing and the second bearing, outer rings of the first bearing and the second bearing are respectively pressed on the shoulders on the first end cover and the second end cover, and the axial positioning of the first rotor is realized;
two ends of the second rotor are supported on the first end cover and the second end cover through a third bearing and a fourth bearing respectively, the second rotor can rotate freely, shoulders at two ends of the second rotor are pressed on inner rings of the third bearing and the fourth bearing respectively, outer rings of the third bearing and the fourth bearing are pressed on the shoulders on the first end cover and the second end cover respectively, and axial positioning of the second rotor 4 is realized;
be equipped with imbibition mouth and leakage fluid dram on the pump casing, imbibition mouth and leakage fluid dram are located the both sides of pump casing respectively, and the inside cavity of pump casing passes through imbibition mouth and liquid supply pipeline intercommunication, and the inside cavity of pump casing passes through leakage fluid dram and fluid-discharge tube way intercommunication.
In a preferred embodiment, the first transmission shaft and the first rotor are coaxially and fixedly connected through a spline or a flat key, and the first transmission shaft penetrates through the first pump end cover and is exposed outside the pump shell; the second transmission shaft and the second rotor are coaxially and fixedly connected through splines or flat keys, and the second transmission shaft also penetrates through the first pump end cover and is exposed outside the pump shell.
In a preferred embodiment, the oval contour line is formed by connecting a first semicircle of the inner wall of the shell, a first straight line segment, a second semicircle of the inner wall of the shell and a second straight line segment end to end; the first semicircle of the inner wall of the shell and the second semicircle of the inner wall of the shell are two semicircles with equal diameters, the first straight line segment and the second straight line segment are two parallel straight lines with equal length, and two ends of the first straight line segment and the second straight line segment are respectively tangent with the first semicircle of the inner wall of the shell and the second semicircle of the inner wall of the shell; the first axis of the inner wall of the shell is the axis of the semi-cylindrical surface specified by the first semicircle of the inner wall of the shell, the second axis of the inner wall of the shell is the axis of the semi-cylindrical surface specified by the second semicircle of the inner wall of the shell, and the first axis of the inner wall of the shell is parallel to the second axis of the inner wall of the shell.
In a preferred embodiment, the thickness of the gap between the outer cylindrical surface of the first rotor and the semi-cylindrical surface defined by the first semi-circle of the inner wall of the housing is not constant along the circumferential direction, the maximum thickness of the gap is a liquid suction gap, the minimum thickness of the liquid suction gap is a liquid discharge gap, and the thickness of the gap gradually decreases from the liquid suction gap to the liquid discharge gap along the circumferential direction of the rotor.
In a preferred embodiment, the thickness of the gap between the outer cylindrical surface of the second rotor and the semi-cylindrical surface defined by the second semicircle of the inner wall of the housing is not constant along the circumferential direction, the maximum thickness of the gap is a liquid suction gap, the minimum thickness of the gap is a liquid discharge gap, and the thickness of the gap gradually decreases from the liquid suction gap to the liquid discharge gap along the circumferential direction of the rotor.
In a preferred embodiment, a connecting line of the first semicircle of the inner wall of the shell and the second semicircle of the inner wall of the shell is used as a boundary, the axes of the second rotor and the first rotor are positioned at the same side of the connecting line, the outer cylindrical surface of the first rotor and the outer cylindrical surface of the second rotor are in geometric contact or non-contact, namely, a rotor gap is formed, and the rotor gap is not larger than the liquid discharge gap.
Compared with the prior art, the technical scheme of the utility model possess following beneficial effect:
the utility model provides a non-impeller rotor valveless pump for artificial heart, the motion form is simple, compact structure, small. The utility model discloses a main moving part is first rotor and second rotor, and the motion mode is rotary motion, by transmission shaft direct drive, does not have the secondary conversion of motion form, and the pump casing inner space obtains make full use of, and each part location is reliable, and work is steady. The utility model discloses the part is simple, and easily miniaturization, when being applied to artificial heart, can effectively reduce the surgical operation degree of difficulty and infect the risk.
The stress condition of the parts is good, and the service life is long. The utility model discloses in the course of the work, non-compressive stress between first rotor and the second rotor, contactless between first rotor and second rotor and the pump casing internal face, nearly no friction, wearing and tearing risk, consequently, can long-time continuous operation, the reliability is high, long service life.
Drawings
FIG. 1 is a radial cross-sectional view of a non-impeller rotor valveless pump for an artificial heart in a preferred embodiment of the present invention;
FIG. 2 is a cross-sectional view of section A-A of a non-impeller rotor valveless pump for an artificial heart in a preferred embodiment of the present invention;
FIG. 3 is a cross-sectional view of section B-B of a non-impeller rotor valveless pump for an artificial heart in a preferred embodiment of the present invention;
fig. 4 is a schematic view showing a cross-sectional shape of an inner wall of a pump casing of a non-impeller rotor valveless pump for an artificial heart and a positional relationship between a first rotor and a second rotor according to a preferred embodiment of the present invention.
Detailed Description
The invention is further described with reference to the drawings and the detailed description.
Referring to fig. 1 and 4, a non-impeller rotor valveless pump for an artificial heart comprises a pump shell 7, wherein the cross-sectional profile of the inner wall surface of the shell is in an oblong shape, the oblong contour line is formed by connecting a first semicircle 20 of the inner wall of the shell, a first straight line segment 15, a second semicircle 23 of the inner wall of the shell and a second straight line segment 19 end to end, the first semicircle 20 of the inner wall of the shell and the second semicircle 23 of the inner wall of the shell are semicircles with equal diameters, the first straight line segment 15 and the second straight line segment 19 are two parallel straight lines with equal lengths, and two ends of the first straight line segment 15 and the second straight line segment 19 are respectively tangent to the first semicircle 20 of the inner wall of the shell and the; the first axis 9 of the inner wall of the shell is the axis of a semi-cylindrical surface specified by the first semicircle 20 of the inner wall of the shell, the second axis 24 of the inner wall of the shell is the axis of a semi-cylindrical surface specified by the second semicircle 23 of the inner wall of the shell, and the first axis 9 of the inner wall of the shell is parallel to the second axis 24 of the inner wall of the shell;
referring to fig. 2, 3 and 4, the first rotor 1 and the second rotor 4 are two cylinders with equal diameters, the first rotor 1 and the second rotor 4 are installed in parallel inside the pump housing 7, and their axes are parallel to the first axis 9 of the inner wall of the housing and the second axis 24 of the inner wall of the housing, the eccentricity 5 is provided between the axis of the first rotor 1 and the first axis 9 of the inner wall of the housing, so that the thickness of the gap between the outer cylindrical surface of the first rotor 1 and the semi-cylindrical surface defined by the first semi-circle 20 of the inner wall of the housing is not constant along the circumferential direction, the maximum thickness of the gap is the liquid suction gap 21, the minimum thickness of the gap is the liquid discharge gap 6, the thickness of the gap is gradually reduced from the liquid suction gap 21 to the liquid discharge gap 6 along the circumferential direction of the rotor, the arrangement situation of the second rotor 4 is completely symmetrical to the arrangement situation of the first rotor 1, that is, the eccentricity 5 is provided between the axis, the thickness of the gap between the outer cylindrical surface of the second rotor 4 and the semi-cylindrical surface defined by the second semicircle 23 of the shell inner wall is not constant along the circumferential direction, the maximum position of the gap thickness is a liquid suction gap 21, the minimum position of the gap thickness is a liquid discharge gap 6, the thickness of each gap is gradually reduced from the liquid suction gap 21 to the liquid discharge gap 6 along the circumferential direction of the rotor, in addition, the connecting line of the first semicircle 20 of the shell inner wall and the second semicircle 23 of the shell inner wall is used as a boundary, the axial lines of the second rotor 4 and the first rotor 1 are positioned on the same side of the connecting line, the outer cylindrical surface of the first rotor 1 and the outer cylindrical surface of the second rotor 4 are in geometric contact or non-contact, namely, the rotor gap 3 is provided, and the rotor gap 3 is not larger than.
Referring to fig. 2 and 3, a first end cover 14 and a second end cover 10 are respectively mounted at two ends of a pump housing 7 through screws, so that a closed cavity is formed inside the pump housing 7, two ends of a first rotor 1 are respectively supported on the first end cover 14 and the second end cover 10 through a first bearing 12 and a second bearing 11, the first rotor 1 can freely rotate, shoulders at two ends of the first rotor 1 are respectively pressed on inner rings of the first bearing 12 and the second bearing 11, outer rings of the first bearing 12 and the second bearing 11 are respectively pressed on shoulders on the first end cover 14 and the second end cover 10, and axial positioning of the first rotor 1 is realized through the connection; the second rotor 4 is supported and positioned in a similar manner to the first rotor 1, that is, two ends of the second rotor 4 are supported on the first end cover 14 and the second end cover 10 through the third bearing 17 and the fourth bearing 16, respectively, the second rotor 4 can rotate freely, shoulders at two ends of the second rotor 4 are pressed on inner rings of the third bearing 17 and the fourth bearing 16, respectively, outer rings of the third bearing 17 and the fourth bearing 16 are pressed on shoulders on the first end cover 14 and the second end cover 10, and the axial positioning of the second rotor 4 is realized through the connection;
referring to fig. 2 and 3, the first transmission shaft 13 is coaxially and fixedly connected with the first rotor 1 through a spline or a flat key, the first transmission shaft 13 passes through the first pump end cover and is exposed outside the pump housing 7, in addition, the first transmission shaft 13 and the first rotor 1 can also be manufactured into the same part, and then the first transmission shaft 13 and the first rotor 1 refer to two parts on the part, similarly, the second transmission shaft 18 is coaxially and fixedly connected with the second rotor 4 through a spline or a flat key, and the second transmission shaft 18 also passes through the first pump end cover and is exposed outside the pump housing 7, in addition, the second transmission shaft 18 and the second rotor 4 can also be manufactured into the same part, and then the second transmission shaft 18 and the second rotor 4 refer to two parts on the part.
Referring to fig. 1, a liquid suction port 2 and a liquid discharge port 8 are arranged on the pump housing 7, the connecting line of the first semicircle 20 of the inner wall of the housing and the second semicircle 23 of the inner wall of the housing is used as a boundary, the liquid suction port 2 and the liquid discharge port 8 are respectively positioned on two sides of the pump housing 7, the inner cavity of the pump housing 7 is communicated with a liquid supply pipeline through the liquid suction port 2, and the inner cavity of the pump housing 7 is communicated with a liquid discharge pipeline through the liquid discharge port 8.
Referring to fig. 1 and 4, in operation, the first rotor 1 and the second rotor 4 rotate simultaneously under the driving of the external device, and the rotation directions of the first rotor 1 and the second rotor 4 should satisfy the following motions: one side of the outer cylindrical surface of the first rotor 1 facing the first semicircle of the shell rotates from the liquid suction gap 21 to the liquid discharge gap 6; the side of the outer cylindrical surface of the second rotor 4 facing the second half circle of the housing is also rotated in the direction of the liquid discharge gap 6 by the liquid suction gap 21.
The above structure is regarded as a working unit, and more than two units can be connected in series through the respective liquid suction port 2 and the liquid discharge port 8, so that multi-stage pressurization is realized, and the purpose of improving output pressure is achieved.
The utility model discloses a theory of operation: the pump housing 7 is fixed and the first rotor 1 and the second rotor 4 rotate simultaneously under the drive of the external driving device, and since the actual fluids have certain viscosity, the first rotor 1 will cause Couette flow (Couette flow) in the gap between the outer cylindrical surface of the first rotor 1 and the semi-cylindrical surface defined by the first semi-circle 20 of the inner wall of the housing, and the Couette flow direction is the same as the rotation direction of the first rotor 1. According to the theory of fluid mechanics (force balance equation of fluid infinitesimal and one-dimensional Reynolds equation), a wedge-shaped gap is formed between the surfaces in relative motion, and when the liquid flows from the large end of the gap to the small end of the gap, the pressure in the gap is higher than that at the inlet, i.e. the large end of the gap. Contrast the utility model discloses, the couette that first rotor 1 arouses flows to make the fluid flow from the imbibition clearance promptly, flows by the flowing back clearance, and simultaneously, fluidic pressure is improved. At the side of the first rotor 1 facing away from the semi-cylindrical surface defined by the first semi-circle 20 of the inner wall of the housing, couette flow due to the rotation of the first rotor 1 is also present, but due to the geometrical contact between the first rotor 1 and the second rotor 4 or the small rotor gap 3, the fluid flow resistance is greater and the fluid flow is smaller. The flow around the second rotor 4 is exactly the same as in the case of the first rotor 1, i.e. the rotation of the second rotor 4 will also cause couette flow from the suction gap 21 in the direction of the discharge gap 6, and the fluid pressure is increased during the flow.
The liquid suction port 2 on the pump housing 7 is communicated with the liquid suction gap 21, the liquid discharge port 8 is communicated with the liquid discharge gap 6, when the first rotor 1 and the second rotor 4 rotate continuously, fluid can continuously flow into the pump housing 7 from the liquid suction port 2, and is discharged from the liquid discharge port 8 after the pressure is increased.
The above, only be the preferred embodiment of the present invention, but the design concept of the present invention is not limited to this, and any skilled person familiar with the technical field is in the technical scope disclosed in the present invention, and it is right to utilize this concept to perform insubstantial changes to the present invention, all belong to the act of infringing the protection scope of the present invention.
Claims (6)
1. A non-impeller rotor valveless pump for artificial heart is characterized by comprising a pump shell, wherein the cross section contour of the inner wall surface of the shell is oblong;
the first rotor and the second rotor are two cylinders with equal diameters, the first rotor and the second rotor are arranged in the pump shell in parallel, the axes of the first rotor and the second rotor are parallel to a first axis of the inner wall of the shell and a second axis of the inner wall of the shell, an eccentric distance is arranged between the axis of the first rotor and the first axis of the inner wall of the shell, and an eccentric distance is also arranged between the axis of the second rotor and the second axis of the inner wall of the shell;
the first end cover and the second end cover are respectively arranged at two ends of the pump shell, so that a closed cavity is formed in the pump shell, two ends of the first rotor are respectively supported on the first end cover and the second end cover through the first bearing and the second bearing, the first rotor can freely rotate, shoulders at two ends of the first rotor are respectively pressed on inner rings of the first bearing and the second bearing, outer rings of the first bearing and the second bearing are respectively pressed on the shoulders on the first end cover and the second end cover, and the axial positioning of the first rotor is realized;
two ends of the second rotor are supported on the first end cover and the second end cover through a third bearing and a fourth bearing respectively, the second rotor can rotate freely, shoulders at two ends of the second rotor are pressed on inner rings of the third bearing and the fourth bearing respectively, outer rings of the third bearing and the fourth bearing are pressed on the shoulders on the first end cover and the second end cover respectively, and axial positioning of the second rotor 4 is realized;
be equipped with imbibition mouth and leakage fluid dram on the pump casing, imbibition mouth and leakage fluid dram are located the both sides of pump casing respectively, and the inside cavity of pump casing passes through imbibition mouth and liquid supply pipeline intercommunication, and the inside cavity of pump casing passes through leakage fluid dram and fluid-discharge tube way intercommunication.
2. The valveless pump according to claim 1, wherein the first drive shaft is coaxially and fixedly connected with the first rotor through a spline or a flat key, and the first drive shaft passes through the first pump end cover and is exposed outside the pump housing; the second transmission shaft and the second rotor are coaxially and fixedly connected through splines or flat keys, and the second transmission shaft also penetrates through the first pump end cover and is exposed outside the pump shell.
3. A non-impeller rotor valveless pump for an artificial heart according to claim 2, wherein the oblong contour is composed of a first half circle of an inner wall of the housing, a first straight line segment, a second half circle of the inner wall of the housing, and a second straight line segment connected end to end; the first semicircle of the inner wall of the shell and the second semicircle of the inner wall of the shell are two semicircles with equal diameters, the first straight line segment and the second straight line segment are two parallel straight lines with equal length, and two ends of the first straight line segment and the second straight line segment are respectively tangent with the first semicircle of the inner wall of the shell and the second semicircle of the inner wall of the shell; the first axis of the inner wall of the shell is the axis of the semi-cylindrical surface specified by the first semicircle of the inner wall of the shell, the second axis of the inner wall of the shell is the axis of the semi-cylindrical surface specified by the second semicircle of the inner wall of the shell, and the first axis of the inner wall of the shell is parallel to the second axis of the inner wall of the shell.
4. A non-impeller rotor valveless pump for an artificial heart according to claim 3, wherein the thickness of the gap between the outer cylindrical surface of the first rotor and the semi-cylindrical surface defined by the first semi-circle of the inner wall of the housing is not constant in the circumferential direction, the maximum thickness of the gap is a suction gap, the minimum thickness of the suction gap is a discharge gap, and the thickness of the gap gradually decreases from the suction gap to the discharge gap in the circumferential direction of the rotor.
5. The non-impeller rotor valveless pump for an artificial heart according to claim 3, wherein a thickness of a gap between the outer cylindrical surface of the second rotor and a semi-cylindrical surface defined by the second semi-circle of the inner wall of the housing is not constant in a circumferential direction, a maximum gap thickness is a suction gap, a minimum gap thickness is a discharge gap, and a thickness of each gap gradually decreases from the suction gap to the discharge gap in the circumferential direction of the rotor.
6. A non-impeller rotor valveless pump for an artificial heart according to claim 3, wherein a center line of a first semicircle of the inner wall of the housing and a second semicircle of the inner wall of the housing is defined, the axis of the second rotor and the first rotor are located on the same side of the center line, and the outer cylindrical surface of the first rotor and the outer cylindrical surface of the second rotor are in geometric contact or non-contact, i.e. have a rotor clearance which is not larger than the liquid discharge clearance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020519641.9U CN212466832U (en) | 2020-04-10 | 2020-04-10 | Non-impeller rotor valveless pump for artificial heart |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020519641.9U CN212466832U (en) | 2020-04-10 | 2020-04-10 | Non-impeller rotor valveless pump for artificial heart |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212466832U true CN212466832U (en) | 2021-02-05 |
Family
ID=74451018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020519641.9U Active CN212466832U (en) | 2020-04-10 | 2020-04-10 | Non-impeller rotor valveless pump for artificial heart |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212466832U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111420144A (en) * | 2020-04-10 | 2020-07-17 | 华侨大学 | Non-impeller rotor valveless pump for artificial heart |
-
2020
- 2020-04-10 CN CN202020519641.9U patent/CN212466832U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111420144A (en) * | 2020-04-10 | 2020-07-17 | 华侨大学 | Non-impeller rotor valveless pump for artificial heart |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2908839C (en) | Positive displacement gear pump | |
| US9121405B2 (en) | Trochoidal rotary device | |
| CN212466832U (en) | Non-impeller rotor valveless pump for artificial heart | |
| CN108603500A (en) | Screw compressor | |
| CN111420144A (en) | Non-impeller rotor valveless pump for artificial heart | |
| CN210013809U (en) | Hydraulic peristaltic pump in corrugated pipe extrusion form | |
| CN214887936U (en) | High-efficient double entry pump | |
| CN115143109A (en) | Cylinder sealed rotor compressor, pump and motor | |
| CN212717028U (en) | Novel high-pressure single-union plug pump | |
| CN210919828U (en) | Bearing for fluid pump | |
| CN109737052B (en) | Gear pump | |
| CN103671087A (en) | Pumps with revolving piston structure, related products and part of embodiments | |
| CN212003569U (en) | Novel rotor sliding vane pump | |
| Zhu et al. | Which will win in the gear pump technology | |
| CN220539927U (en) | Supercharging rotor wing | |
| CN109519370A (en) | Grooved pulley type diamond shape piston hydraulic pressure pump | |
| CN216894889U (en) | Variable displacement vane pump | |
| CN216407140U (en) | Piston fluid pump | |
| CN219606716U (en) | Cycloidal pump for lubrication system | |
| CN209053782U (en) | A kind of spherical spinner pump | |
| CN111322239A (en) | Novel rotor sliding vane pump | |
| CN201165976Y (en) | Knead type water pump | |
| CN211975379U (en) | Rotor sliding vane pump | |
| CN215949786U (en) | Peristaltic pump with noise reduction structure | |
| CN117329124A (en) | Wheel disc type kinetic energy converter of swing blade |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |