CN109469627B - Portable air exhaust device of centrifugal pump and centrifugal pump equipment - Google Patents

Portable air exhaust device of centrifugal pump and centrifugal pump equipment Download PDF

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Publication number
CN109469627B
CN109469627B CN201910011944.1A CN201910011944A CN109469627B CN 109469627 B CN109469627 B CN 109469627B CN 201910011944 A CN201910011944 A CN 201910011944A CN 109469627 B CN109469627 B CN 109469627B
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China
Prior art keywords
air
way valve
centrifugal pump
disc
valve
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CN109469627A (en
Inventor
王成
王圣洁
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Suzhou Institute of Trade and Commerce
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Suzhou Institute of Trade and Commerce
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Priority to CN201910011944.1A priority Critical patent/CN109469627B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
    • F04D9/043—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock the priming pump being hand operated or of the reciprocating type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/10—Adaptations or arrangements of distribution members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/14—Provisions for readily assembling or disassembling

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

The invention discloses a portable air extractor of centrifugal pump, comprising: the device comprises a driving body, a motor, a disc, a cylinder body, a piston rod, an air extraction body, a first one-way valve and a second one-way valve; the motor is fixed on one side end face of the driving body, a rotating shaft of the motor is connected with a disc key, and a driving rod is connected with a bearing on one side of the disc far away from the rotating center of the disc; the driving body is in threaded connection and communicated with the cylinder body, the piston is hinged with one end of the piston rod, and the other end of the piston rod is connected with the driving rod; the air suction body is in threaded connection and communicated with the air cylinder body, the first one-way valve is arranged on an air inlet hole of the air suction body, and the second one-way valve is arranged on an air outlet hole of the air suction body. The invention has the technical characteristics of convenient operation, low cost, easy assembly, easy carrying and high air extraction efficiency.

Description

Portable air exhaust device of centrifugal pump and centrifugal pump equipment
Technical Field
The invention belongs to the technical field of centrifugal pump equipment, and particularly relates to a portable air extractor of a centrifugal pump and the centrifugal pump equipment.
Background
When the centrifugal pump works directly, the accumulated gas exists in the pump shell, the centrifugal force generated by the impeller is very small because of the small air density, the center of the impeller has only weak negative pressure, the negative pressure is insufficient to suck liquid, the suction inlet of the centrifugal pump cannot form vacuum, the gas binding phenomenon is generated, the impeller idles to cause the damage of the centrifugal pump, and therefore, the pump shell and the suction pipe are filled with water before the centrifugal pump is started, and the gas in the pump is discharged.
The following three ways are mainly adopted to solve the above problems:
The first is to flush water at the bottom valve part, the bottom valve is a one-way valve at the inlet of the water inlet pipe, but the method has larger loss on the water head of the bottom valve, and reduces the working efficiency of the water pump;
The second is to add a water diversion tank, the water diversion tank is positioned between the water pump and the water source, the water diversion tank and the centrifugal pump are filled with water before use, and the water diversion tank has a large volume and high cost and can cause great waste of water resources although the operation method is simple;
The third is to adopt large-scale vacuum air extractor, and the device is easy to damage and be difficult to maintain, and inside easy to exist air in the use is difficult to discharge by oneself, needs artifical mediation, can cause the loss of machine in the past, leads to when the water pump starts, can produce the condition of taking out not water, reduces work efficiency. Before each product is used, the pump shell is filled with liquid manually, and then a power supply is started to work, so that each manual filling procedure is complicated, and the working efficiency is low.
Disclosure of Invention
The invention aims to provide a portable air extracting device of a centrifugal pump and centrifugal pump equipment, which have the technical characteristics of convenience in operation, low cost, easiness in maintenance and assembly, portability and high air extracting efficiency.
In order to solve the problems, the technical scheme of the invention is as follows:
A centrifugal pump portable suction device comprising:
The device comprises a driving body, a motor, a disc, a cylinder body, a piston rod, an air extraction body, a first one-way valve and a second one-way valve; the motor is fixed on one side end face of the driving body, a rotating shaft of the motor is connected with the disc through a key, a driving rod is connected to the disc on one side, far away from the rotating center of the disc, of the disc through a bearing, the motor drives the disc to rotate, and the disc rotates to drive the driving rod to rotate around the rotating center of the disc; the driving body is in threaded connection and communicated with the cylinder body, the piston is hinged with one end of the piston rod, the other end of the piston rod is connected with the driving rod, and the motor drives the piston to slide back and forth in the cylinder body through the piston rod; the air suction body is in threaded connection and communication with the air cylinder body, the first one-way valve is arranged on an air inlet hole of the air suction body and used for unidirectional circulation of air from the outer side to the inner side of the air suction body, and the second one-way valve is arranged on an air outlet hole of the air suction body and used for unidirectional circulation of air from the inner side to the outer side of the air suction body.
According to an embodiment of the invention, the first one-way valve and the second one-way valve comprise valve cores, springs and guide blocks, the valve cores are embedded in the guide blocks, the springs are sleeved on the valve cores, and two ends of the springs are respectively in elastic contact with the valve cores and the guide blocks so as to realize tight pressing of the valve cores and the air outlet holes or the air inlet holes.
According to an embodiment of the invention, the air exhaust body is provided with a switch connecting piece at the air outlet for quick installation and disassembly of an external pipeline of the air outlet.
According to an embodiment of the invention, the valve core of the first one-way valve and the valve core of the second one-way valve are respectively sleeved with a first sealing ring, and the first sealing rings are used for sealing between the valve core and the air inlet hole or the air outlet hole.
According to an embodiment of the invention, the piston sleeve is provided with a second sealing ring for sealing between the inner wall of the cylinder body and the piston.
According to an embodiment of the invention, the driving body and the air extraction body are provided with third sealing rings in thread tool retracting grooves for sealing the air cylinder body and the driving body, and the air cylinder body and the air extraction body.
According to one embodiment of the invention, the air suction body is provided with a connecting thread for connecting the centrifugal pump at the air inlet hole, and a cutter withdrawal groove of the connecting thread is provided with a fourth sealing ring for sealing between the manual air suction device of the centrifugal pump and the centrifugal pump.
A centrifugal pump apparatus comprising a portable air extractor as in any one of the embodiments above.
By adopting the technical scheme, the invention has the following advantages and positive effects compared with the prior art:
(1) The invention is provided with three detachable parts of the driving body, the air cylinder body and the air exhaust body, the driving body and the air exhaust body are respectively embedded in the air cylinder body through threads, and the bodies can be easily assembled and disassembled for maintenance and carrying, thereby achieving the technical effects of easy maintenance and assembly, portability and low cost; meanwhile, the motor is adopted to drive the disc to rotate, the disc rotates to drive the piston to reciprocate through the piston rod, and the reciprocating motion of the piston is combined with the two one-way valves, so that continuous air suction of the centrifugal pump can be realized, the air binding phenomenon of the centrifugal pump is solved, and the technical effects of convenience in operation and high air suction efficiency are achieved;
(2) The first one-way valve and the second one-way valve both adopt valve cores, springs and guide blocks, the valve core positions are limited by the guide blocks so as to be aligned with the air inlet holes or the air outlet holes, the valve cores are forced by the spring force, the first one-way valve and the second one-way valve both keep a locking state when the air is not exhausted, namely the air inlet holes and the air outlet holes are sealed, when the air is absorbed, the first one-way valve absorbs air by overcoming the spring force due to the air pressure difference, the second one-way valve keeps a locking state when the air is exhausted, and the second one-way valve exhausts air by overcoming the spring force due to the air pressure difference, so that the technical effects of high air extraction efficiency, good sealing performance and good air extraction effect are achieved;
(3) According to the invention, the first check valve and the second check valve are sleeved with the first sealing ring at the valve core of the first check valve and the second check valve, so that the sealing performance of the air inlet hole and the air outlet hole is improved, the second sealing ring is sleeved at the piston, the sealing performance between the cylinder body and the piston is improved, the third sealing rings are arranged between the cylinder body and the driving body and between the cylinder body and the air exhaust body, the sealing performance between the bodies is improved, the air inlet hole of the air exhaust body is connected with the centrifugal pump through threads, and the fourth sealing ring is arranged, so that the sealing performance between the centrifugal pump and the extraction part is improved, and in sum, the technical effects of good sealing performance and good air exhaust effect are achieved.
Drawings
FIG. 1 is a front view of a portable air extractor for a centrifugal pump according to the present invention;
FIG. 2 is a top view of a portable air extractor for a centrifugal pump according to the present invention;
Reference numerals:
11: a driving body; 12: a disc; 13: a driving rod; 14: a motor; 15: a cross insert; 16: a base; 21: a cylinder body; 22: a piston; 23: a piston rod; 31: an air extraction body; 32: a second one-way valve; 33: a first one-way valve; 34: a valve core; 35: a spring; 36: a guide block; 37: a switch connection; 41: a first seal ring; 42: a second seal ring; 43: a third seal ring; 44: and a fourth sealing ring.
Detailed Description
The invention provides a portable air extracting device of a centrifugal pump and centrifugal pump equipment, which are further described in detail below with reference to the accompanying drawings and specific embodiments. Advantages and features of the invention will become more apparent from the following description and from the claims.
Referring to fig. 1, the present embodiment provides a portable air extraction device for a centrifugal pump, including: the device comprises a driving body 11, a motor 14, a disc 12, a cylinder body 21, a piston 22, a piston rod 23, an air extraction body 31, a first check valve 33 and a second check valve 32; the motor 14 is fixed on one side end surface of the driving body 11, a rotating shaft of the motor 14 is connected with the disc 12 in a key way, a driving rod 13 is connected with the disc 12 on one side far away from the rotating center of the disc 12 through a bearing, wherein the motor 14 drives the disc 12 to rotate, and the disc 12 rotates to drive the driving rod 13 to rotate around the rotating center of the disc; the driving body 11 and the cylinder body 21 are in threaded connection and communicated, the piston 22 is hinged with one end of the piston rod 23, the other end of the piston rod 23 is connected with the driving rod 13, and the driving rod drives the piston 22 to reciprocate in the cylinder body 21 through the piston rod 23; the air extraction body 31 and the air cylinder body 21 are in threaded connection and communicated, the first one-way valve 33 is arranged on an air inlet hole of the air extraction body 31 and used for one-way circulation of air from the outer side of the air extraction body 31 to the inner side, and the second one-way valve 32 is arranged on an air outlet hole of the air extraction body 31 and used for one-way circulation of air from the inner side of the air extraction body 31 to the outer side.
The mechanical structure in this embodiment will now be described in detail:
Specifically, referring to fig. 2, a motor 14 is fixed to a base 16 through a cross insert 15, the base 16 is fixed to one side end surface of a driving body 11 through a screw, a rotation shaft of the motor 14 penetrates into the driving body 11 to be connected with a disk 12 in a key manner, the disk 12 is fixed by a nut, a bearing is provided between the rotation shaft and the driving body 11, a driving rod 13 is mounted on one side of the disk 12 away from a rotation center, the driving rod 13 can rotate around a central axis of itself, and secondly, the driving rod 13 performs a circular motion with the rotation center of the disk 12 after the disk 12 rotates.
Specifically, referring to fig. 1, a cylinder body 21 and a driving body 11 are in threaded connection and communication, a hinge is fixed on a piston 22 through a screw, the hinge is connected with one end of a piston rod 23, and the other end of the piston rod 23 passes through the cylinder body 21 and the driving body 11 and is connected with a driving rod 13; the disc 12 is driven to rotate by the motor 14, the disc 12 rotates to drive the driving rod 13 to do circular motion around the rotation center of the disc 12, and the driving rod 13 moves circularly to drive the piston 22 to do reciprocating sliding in the cylinder body 21 by the piston rod 23.
Specifically, referring to fig. 1, the air extraction body 31 and the air cylinder body 21 are in threaded connection and communicated, the air extraction body 31 is provided with an air inlet hole and an air outlet hole, a first one-way valve 33 is installed at the air inlet hole, and a second one-way valve 32 is installed at the air outlet hole: in the pumping state, the piston 22 moves to the right, the pressure in the cylinder is reduced, the first one-way valve 33 is in an open state, the second one-way valve 32 is in a locking state under the action of the difference between the internal pressure and the external pressure, and the gas enters the cylinder from the gas inlet hole; in the exhaust state, the piston 22 moves to the left, the pressure in the cylinder increases, the first one-way valve 33 is in a locking state under the action of the difference between the internal pressure and the external pressure, the second one-way valve 32 is in an opening state, gas is discharged from the air outlet hole to the cylinder, the piston 22 slides reciprocally, the compression and release of the gas in the cylinder are realized, and the process of pumping the centrifugal pump by the device of the embodiment is also realized.
The invention is provided with three detachable parts of the driving body, the air cylinder body and the air exhaust body, the driving body and the air exhaust body are respectively embedded in the air cylinder body through threads, and the bodies can be easily assembled and disassembled for maintenance and carrying, thereby achieving the technical effects of easy maintenance and assembly, portability and low cost; meanwhile, the motor is adopted to drive the disc to rotate, the disc rotates to drive the piston to reciprocate through the piston rod, and the reciprocating motion of the piston is combined with the two one-way valves, so that continuous air suction of the centrifugal pump can be realized, the air binding phenomenon of the centrifugal pump is solved, and the technical effects of convenience in operation and high air suction efficiency are achieved.
Preferably, referring to fig. 1, the first check valve 33 and the second check valve 32 of the present embodiment each include a valve core, a spring, and a guide block 36, where the valve core is embedded in the guide block 36, and the valve core is sleeved with the spring, and two ends of the spring are respectively in elastic contact with the valve core and the guide block 36, so as to implement tight pressing of the valve core and the air outlet hole or the air inlet hole. The valve core moves along the guiding direction of the guiding block 36 to realize the opening or locking of the air outlet hole or the air inlet hole.
The first check valve 33 and the second check valve 32 of this embodiment all adopt the case, the spring, the guide block 36, limit the case position through the guide block 36, in order to aim at inlet port or venthole, apply force to the case through the spring elasticity, realize when not pumping, first check valve 33 and second check valve 32 all keep locking state, seal inlet port and venthole promptly, when pumping, first check valve 33 is inhaled because the atmospheric pressure difference overcomes the spring elasticity, second check valve 32 keeps locking state, when exhausting, first check valve 33 keeps locking state, second check valve 32 is discharged because the atmospheric pressure difference overcomes the spring elasticity, have reached the high, the leakproofness of pumping efficiency, technological effect good.
Preferably, referring to fig. 1, the air extraction body 31 of the present embodiment is provided with a switch connector 37 at the air outlet for quick installation and removal of the external connection pipe of the air outlet. The switch connecting piece 37 of the embodiment is a buckle type connecting piece, and the external pipeline can be directly connected in a buckle mode, so that the trouble of installation and disassembly of threaded connection is avoided, and the technical effect of easy assembly and easy operation is achieved.
Preferably, referring to fig. 1, the valve core of the first check valve 33 and the valve core of the second check valve 32 of the present embodiment are respectively sleeved with a first sealing ring 41 for sealing between the valve core and the air inlet hole or the air outlet hole. The first check valve 33 and the second check valve 32 of this embodiment are sleeved with the first sealing ring 41 at the valve cores of the two, so as to increase the tightness of the air inlet hole and the air outlet hole.
Preferably, referring to fig. 1, the piston 22 of the present embodiment is provided with a second seal ring 42 for sealing between the inner wall of the cylinder body and the piston 22. The second sealing ring 42 is sleeved on the piston 22 of the embodiment, so that the tightness between the cylinder body 21 and the piston 22 is improved.
Preferably, referring to fig. 1, the screw thread tool retracting grooves of the driving body 11 and the air extracting body 31 of the present embodiment are provided with a third sealing ring 43 for sealing between the cylinder body 21 and the driving body 11, and between the cylinder body 21 and the air extracting body 31. The third sealing rings 43 are arranged between the cylinder body 21 and the driving body 11 and between the cylinder body 21 and the air extracting body 31, so that the tightness between the bodies is improved.
Preferably, referring to fig. 1, the suction body 31 of the present embodiment is provided with a connecting screw thread for connecting the centrifugal pump at the air intake hole, and a tool retracting groove of the connecting screw thread is provided with a fourth sealing ring 44 for sealing between the portable suction device of the centrifugal pump and the centrifugal pump. The air inlet hole of the air suction body 31 of the embodiment is connected with the centrifugal pump through threads, and is provided with a fourth sealing ring 44, so that the tightness between the centrifugal pump and the pumping part is improved.
In the embodiment, the sealing ring is used for sealing gaps among all the components in the embodiment, so that the technical effects of good sealing performance and good air extraction effect are achieved.
For a better understanding of the present invention, the following description of the present embodiment will be made in terms of usage and principles:
Referring to fig. 1, in this embodiment, the disc 12 is driven by the motor 14 to rotate, the disc 12 rotates to drive the piston rod 23 connected with the driving rod 13, the piston rod 23 drives the connected piston 22 to push rightwards through the hinge, the air pressure in the left cavity of the air cylinder of the device is lower than the external air pressure, the valve core of the second one-way valve 32 is locked under the action of the spring, and the valve core 34 of the first one-way valve 33 moves rightwards after overcoming the resistance of the spring 35 under the action of the air pressure difference, so as to realize air suction; when the motor 14 drives the disc 12 to rotate, the disc 12 rotates to drive the piston rod 23 connected with the driving rod 13, the piston rod 23 drives the connected piston 22 to push leftwards through a hinge, the air pressure in the cylinder is larger than the air pressure outside, the valve core of the first one-way valve 33 is locked under the action of a spring, and the valve core of the second one-way valve 32 moves upwards after overcoming the resistance of the spring under the action of air pressure difference, so that the exhaust is realized.
On the basis of the embodiment, a centrifugal pump device is provided, which comprises the portable air extracting device of the centrifugal pump in any embodiment. The centrifugal pump device solves the gas binding phenomenon of the centrifugal pump before pumping, and the accumulated gas is pumped out simply and efficiently through the portable air pumping device of the centrifugal pump, so that the damage of the centrifugal pump caused by idle running of the impeller is avoided, and the rapid pumping of the centrifugal pump is realized.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is within the scope of the appended claims and their equivalents to fall within the scope of the invention.

Claims (6)

1. A portable pumping device for a centrifugal pump, comprising: the device comprises a driving body, a motor, a disc, a cylinder body, a piston rod, an air extraction body, a first one-way valve and a second one-way valve; the motor is fixed on one side end face of the driving body, a rotating shaft of the motor is connected with the disc through a key, a driving rod is connected to the disc on one side, far away from the rotating center of the disc, of the disc through a bearing, the motor drives the disc to rotate, and the disc rotates to drive the driving rod to rotate around the rotating center of the disc; the driving body is in threaded connection and communicated with the cylinder body, the piston is hinged with one end of the piston rod, the other end of the piston rod is connected with the driving rod, and the motor drives the piston to slide back and forth in the cylinder body through the piston rod; the air suction body is in threaded connection and communicated with the air cylinder body, the first one-way valve is arranged on an air inlet hole of the air suction body and used for one-way circulation of air from the outer side to the inner side of the air suction body, and the second one-way valve is arranged on an air outlet hole of the air suction body and used for one-way circulation of air from the inner side to the outer side of the air suction body;
The first one-way valve and the second one-way valve comprise valve cores, springs and guide blocks, the valve cores are embedded in the guide blocks, the springs are sleeved on the valve cores, and two ends of the springs are respectively in elastic contact with the valve cores and the guide blocks so as to realize tight pressing of the valve cores and the air outlet holes or the air inlet holes;
The valve core is limited by the guide block to align with the air inlet hole or the air outlet hole, the valve core is forced by the spring force, so that when no air suction is performed, the first one-way valve and the second one-way valve are kept in a locking state, namely the air inlet hole and the air outlet hole are sealed, when air suction is performed, the first one-way valve overcomes the spring force due to air pressure difference to perform air suction, the second one-way valve is kept in a locking state, when air discharge is performed, the first one-way valve is kept in a locking state, and the second one-way valve overcomes the spring force due to the air pressure difference to perform air discharge;
The air exhaust body is provided with a switch connecting piece at the air outlet, and is used for quickly installing and detaching an external pipeline of the air outlet.
2. The portable air extraction device of a centrifugal pump according to claim 1, wherein the valve core of the first one-way valve and the valve core of the second one-way valve are respectively sleeved with a first sealing ring for sealing between the valve core and the air inlet hole or the air outlet hole.
3. The portable pumping device of a centrifugal pump according to claim 2, wherein the piston housing is provided with a second sealing ring for sealing between the inner wall of the cylinder body and the piston.
4. A centrifugal pump portable suction device according to claim 3, wherein the drive body and the suction body are provided with third sealing rings for sealing between the cylinder body and the drive body, between the cylinder body and the suction body.
5. The portable air extracting device for the centrifugal pump according to claim 4, wherein the air extracting body is provided with a connecting thread for connecting the centrifugal pump at the air inlet hole, and a cutter retracting groove of the connecting thread is provided with a fourth sealing ring for sealing between the manual air extracting device for the centrifugal pump and the centrifugal pump.
6. A centrifugal pump apparatus comprising a centrifugal pump portable suction device according to any one of claims 1 to 5.
CN201910011944.1A 2019-01-07 2019-01-07 Portable air exhaust device of centrifugal pump and centrifugal pump equipment Active CN109469627B (en)

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CN110886686B (en) * 2019-12-20 2024-06-07 嘉善精展五金工具有限公司 Manual and pneumatic dual-purpose liquid pumping machine
CN115853794B (en) * 2023-03-02 2023-05-26 四川省机械研究设计院(集团)有限公司 Anti-idle rotation water pump

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