CN111255704B - Pump protection device and pump assembly - Google Patents
Pump protection device and pump assembly Download PDFInfo
- Publication number
- CN111255704B CN111255704B CN201811459579.2A CN201811459579A CN111255704B CN 111255704 B CN111255704 B CN 111255704B CN 201811459579 A CN201811459579 A CN 201811459579A CN 111255704 B CN111255704 B CN 111255704B
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- pump
- protection
- tuning fork
- protection device
- terminals
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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
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
- F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
- F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/406—Casings; Connections of working fluid especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a pump protection device, belonging to the field of pump monitoring protection, comprising: tuning fork switch, determine module, be used for with pump export the protection pipeline of intercommunication and be used for controlling the first controller that the pump stopped, be equipped with the through-hole on the pipe wall of protection pipeline, tuning fork switch's vibration tuning fork cartridge is in the through-hole, protection pipeline and tuning fork switch's vibration joint sealing connection, determine module includes: detect a section of thick bamboo, piston, metal disc and two terminals, detect a section of thick bamboo be located the protection pipeline outer wall and communicate with the protection pipeline, the piston slides and sets up in detecting a section of thick bamboo, one side that the piston protected the pipeline dorsad is equipped with the metal disc, two terminals relative interval sets up on detecting the inner wall of a section of thick bamboo, a terminal in two terminals is used for being connected with the output line of first controller, another terminal in two terminals is used for being connected with the input line of pump. The invention can avoid the condition that the pump stops working due to the misoperation of the tuning fork switch, and improve the high-efficiency of the pump.
Description
Technical Field
The invention relates to the field of pump monitoring protection, in particular to a pump protection device and a pump assembly.
Background
A pump is a machine that delivers or pressurizes a fluid. The pump generally includes an impeller, a pump casing, and a pump shaft, the impeller is mounted on the pump shaft and disposed in the pump casing together with the pump shaft, and the pump shaft is directly driven by a driving part (such as a motor), so as to drive the impeller to rotate to achieve the purpose of conveying fluid.
During operation of the pump, if the pump is not filled with fluid, the pump will pump out. The pump evacuation can cause large pump outlet pressure fluctuation, intermittent fluid flow and strong pump vibration to damage the pump. Currently, whether the outlet pipeline of the pump is filled with fluid or not is detected through a tuning fork switch.
However, the tuning fork switch is prone to misjudgment due to factors such as environment during use, so that the pump still stops working when the outlet pipeline is filled with fluid, which is not beneficial to efficient use of the pump.
Disclosure of Invention
The embodiment of the invention provides a protection device for a pump, which can avoid the condition that the pump stops working due to misoperation of a tuning fork switch and improve the high-efficiency of the pump. The technical scheme is as follows:
the embodiment of the invention provides a protection device of a pump, which comprises: tuning fork switch, determine module, be used for with pump export the protection pipeline of intercommunication and be used for controlling the first controller that the pump stopped, be equipped with the through-hole on the pipe wall of protection pipeline, tuning fork switch's vibration tuning fork cartridge is in the through-hole, the protection pipeline with tuning fork switch's vibration joint sealing connection, tuning fork switch with the signal input part of first controller is connected, determine module includes: the detection cylinder is positioned on the outer wall of the protection pipeline and communicated with the protection pipeline, the two terminals are inserted on the inner wall of the detection cylinder, the two terminals are positioned between the piston and the metal disc, one of the two terminals is connected with the signal output end of the first controller, the signal input end of the first controller is connected with the tuning fork switch, the other terminal of the two terminals is used for being connected with the pump, the piston is arranged in the detection cylinder in a sliding mode, the metal disc and the protection pipeline are positioned on two opposite sides of the piston, the metal disc is connected with the piston, the metal disc can move between a first position and a second position along with the piston, and when the metal disc is positioned at the first position, the metal plate is in contact with the two terminals, and is separated from the two terminals when the metal plate is located at the second position.
In an implementation manner of the embodiment of the present invention, a mounting pipe communicated with the through hole is disposed on a pipe wall of the protection pipe, a first flange is disposed at one end of the mounting pipe, a second flange is disposed on an outer wall of a casing of the tuning fork switch, and the first flange and the second flange are detachably connected.
In another implementation of the embodiment of the present invention, the protection device further includes an annular sealing ring, and the annular sealing ring is located between the first flange and the second flange.
In another implementation manner of the embodiment of the present invention, the detection assembly further includes an anti-vibration spring, one end of the anti-vibration spring is connected to the metal plate, and the other end of the anti-vibration spring is connected to an inner wall of the detection cylinder.
In another implementation manner of the embodiment of the present invention, one end of each of the two binding posts located in the detection cylinder is provided with a connection metal sheet.
In another implementation manner of the embodiment of the present invention, the protection device further includes a flow meter, and the flow meter is disposed on the protection pipe.
In another implementation manner of the embodiment of the invention, the protection device further comprises a check valve and a shut-off valve, the outlet end of the protection pipeline is communicated with the inlet end of the check valve, and the outlet end of the check valve is communicated with the inlet end of the shut-off valve.
In another implementation manner of the embodiment of the present invention, the protection device further includes a pressure gauge, and the pressure gauge is disposed on the protection pipe.
In another implementation manner of the embodiment of the present invention, the vibrating joint of the tuning fork switch is a ceramic vibrator.
In another aspect, embodiments of the present invention provide a pump assembly comprising a pump and a protection device as described hereinbefore, the protection tubing of the protection device being in communication with the outlet of the pump.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
through communicating protection pipeline and pump, the vibration tuning fork cartridge of tuning fork switch is in the protection pipeline, and the vibration tuning fork vibrates with certain frequency, and because the vibration frequency of vibration tuning fork is different when fluid is full of in the protection pipeline with not full of, the tuning fork switch detects the vibration frequency of vibration tuning fork, judges according to the vibration frequency whether be full of fluid in the protection pipeline. Simultaneously, through setting up the determine module, the determine module is including detecting a section of thick bamboo, piston, metal disc and two terminals, and when the fluid overflow in the protection pipeline, the fluid can get into in detecting a section of thick bamboo, and the determine module then promotes the vertical rebound of piston through the fluid that flows into detecting a section of thick bamboo, and the metal disc that sets up on the piston also can move along with the piston. After the metal disc moved upwards, metal disc and two terminal looks alternate segregation, the circuit disconnection between detection component this moment with first controller and the pump, even if the condition of misjudgement appears because of factors such as environment tuning fork switch like this, also can ensure protection device can not the maloperation, close the pump. When the fluid is not full of in the protection pipeline, two terminal connections of metal disc and detection section of thick bamboo inner wall, detection assembly this moment with the circuit intercommunication between first controller and the pump, then through first controller control pump stop work, through detection assembly and tuning fork switch control protection pipeline rivers condition together to avoid the pump to manage to find time. According to the embodiment of the invention, the detection assembly and the tuning fork switch are arranged to detect whether the protection pipeline is filled with fluid or not, so that the pump is prevented from being pumped out, and the reliability of the protection device is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pump protection device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a detecting assembly according to an embodiment of the present invention;
FIG. 3 is a schematic view of a connecting metal sheet provided on a terminal according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a pump protector according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a protection pipeline according to an embodiment of the present invention.
The symbols in the drawings represent the following meanings:
1-tuning fork switch, 11-vibrating tuning fork, 12-vibrating joint, 13-detecting element, 14-second controller, 15-shell, 16-second flange, 2-protective pipeline, 20-annular sealing ring, 21-through hole, 22-mounting pipe, 23-first flange, 24-connecting flange, 3-first controller, 4-detecting assembly, 41-detecting cylinder, 42-piston, 43-metal disc, 44-binding post, 45-vibration-proof spring, 46-connecting metal sheet, 5-check valve, 6-cut-off valve, 7-pressure gauge and 8-flowmeter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a pump protection device according to an embodiment of the present invention. As shown in fig. 1, the protection device includes: tuning fork switch 1, detection subassembly 4, be used for with pump export protection pipeline 2 that communicates and be used for controlling the first controller 3 that the pump stopped, be equipped with through-hole 21 on the pipe wall of protection pipeline 2, tuning fork switch 1's vibration tuning fork 11 cartridge is in through-hole 21, protection pipeline 2 and tuning fork switch 1's vibration joint 12 sealing connection. Fig. 2 is a schematic structural diagram of a detection assembly according to an embodiment of the present invention. As shown in fig. 2, the detection assembly 4 includes: the detection device comprises a detection cylinder 41, a piston 42, a metal disc 43 and two terminals 44, wherein the detection cylinder 41 is positioned on the outer wall of the protection pipeline 2 and is communicated with the protection pipeline 2, the two terminals 44 are inserted on the inner wall of the detection cylinder 41, the two terminals 44 are positioned between the piston 42 and the metal disc 43, one terminal 44 of the two terminals 44 is connected with a signal output end of a first controller 3, a signal input end of the first controller 3 is connected with a tuning fork switch 1, the other terminal 44 of the two terminals 44 is used for being connected with a pump, the piston 42 is arranged in the detection cylinder 41 in a sliding mode, the metal disc 43 and the protection pipeline 2 are positioned on two opposite sides of the piston 42, the metal disc 43 is connected with the piston 42, the metal disc 43 can move along with the piston 42 between a first position (see the position shown by the piston in figure 2) and a second position (see the position shown by the piston in figure 1), when the metal disc 43 is positioned at the first position, the metal plate 43 is in contact with the two posts 44, and when the metal plate 43 is in the second position, the metal plate 43 is separated from the two posts 44.
Through communicating protection pipeline and pump, the vibration tuning fork cartridge of tuning fork switch is in the protection pipeline, and the vibration tuning fork vibrates with certain frequency, and because the vibration frequency of vibration tuning fork is different when fluid is full of in the protection pipeline with not full of, the tuning fork switch detects the vibration frequency of vibration tuning fork, judges according to the vibration frequency whether be full of fluid in the protection pipeline. Simultaneously, through setting up the determine module, the determine module is including detecting a section of thick bamboo, piston, metal disc and two terminals, and when the fluid overflow in the protection pipeline, the fluid can get into in detecting a section of thick bamboo, and the determine module then promotes the vertical rebound of piston through the fluid that flows into detecting a section of thick bamboo, and the metal disc that sets up on the piston also can move along with the piston. After the metal disc moved upwards, metal disc and two terminal looks alternate segregation, the circuit disconnection between detection component this moment with first controller and the pump, even if the condition of misjudgement appears because of factors such as environment tuning fork switch like this, also can ensure protection device can not the maloperation, close the pump. When the fluid is not full of in the protection pipeline, two terminal connections of metal disc and detection section of thick bamboo inner wall, detection assembly this moment with the circuit intercommunication between first controller and the pump, then through first controller control pump stop work, through detection assembly and tuning fork switch control protection pipeline rivers condition together to avoid the pump to manage to find time. According to the embodiment of the invention, the detection assembly and the tuning fork switch are arranged to detect whether the protection pipeline is filled with fluid or not, so that the pump is prevented from being pumped out, and the reliability of the protection device is improved.
Illustratively, the tuning fork switch provided by the embodiment of the present invention includes: a vibrating tuning fork 11, a vibrating joint 12 for controlling the vibration of the vibrating tuning fork 11, a detecting element 13 for detecting the vibration frequency of the vibrating tuning fork 11 and a casing 15, the vibrating tuning fork 11 being connected to the vibrating joint 12, the vibrating joint 12 being electrically connected to a second controller 14, the second controller 14 being electrically connected to the first controller 3, the detecting element 13 being located on the vibrating tuning fork 11 and the detecting element 13 being electrically connected to the second controller 14, the vibrating joint 12, the detecting element 13 and the second controller 14 being located inside the casing 15, wherein the second controller 14 is used for acquiring the vibration frequency of the vibrating tuning fork 11 in the protective pipe 2 detected by the detecting element 13, the second controller 14 judges whether the protective pipe 2 is filled with fluid or not by analyzing the vibration frequency of the vibrating tuning fork 11, when the protection pipe 2 is not filled with the fluid, a signal indicating that the protection pipe 2 is not filled with the fluid is output to the first controller 3. The first controller 3 controls the pump to stop working after acquiring the signal.
As shown in fig. 1, a mounting pipe 22 communicated with the through hole 21 is arranged on the pipe wall of the protection pipe 2, a first flange 23 is arranged at one end of the mounting pipe 22, a second flange 16 is arranged on the outer wall of the shell 15 of the tuning fork switch 1, and the first flange 23 is detachably connected with the second flange 16. According to the embodiment of the invention, the mounting pipe 22 is arranged on the through hole 21 of the protection pipeline 2, so that the tuning fork switch can be conveniently inserted, meanwhile, the first flange 23 is arranged on the mounting pipe 22, and the second flange 16 matched and connected with the first flange 23 is arranged on the shell 15, so that the tuning fork switch can be detachably connected, and the tuning fork switch can be conveniently maintained and replaced. Meanwhile, the installation tube 22 is arranged, so that the tuning fork switch is prevented from being directly fixedly connected to the through hole 21, and the sealing performance is improved.
Optionally, the protection device further comprises an annular sealing ring 20, which is located between the first flange 23 and the second flange 16. The provision of the annular seal ring 20 between the first flange 23 and the second flange 16 prevents the flow in the protection pipe 2 from leaking from the gap between the first flange 23 and the second flange 16, further enhancing the sealing performance and improving the reliability of the protection device.
As shown in fig. 2, the detecting unit 4 further includes an anti-vibration spring 45, one end of the anti-vibration spring 45 is connected to the metal plate 43, and the other end of the anti-vibration spring 45 is connected to the inner wall of the detecting cylinder 41. The detection cylinder 41 has an open end and a closed end opposite to each other, the open end is connected to the protection pipe 2, and the end face of the closed end is connected to the other end of the protection vibration spring 45.
In this embodiment, the anti-vibration spring 45 is always in a compressed state, when the pump normally works, the protection pipe 2 is filled with water flow, and the metal plate 43 is pushed by the water pressure of the water flow in the protection pipe 2 to overcome the elastic force of the anti-vibration spring 45, so that the metal plate 43 and the terminal 44 are separated from each other. When the pump is empty, the water flow in the protection pipeline 2 is not full, the fluctuation of the water flow pressure in the protection pipeline 2 is large at the moment, the metal disc 43 vibrates, the wiring terminal 44 and the metal disc 43 can be pressed through the anti-vibration spring 45, the wiring terminal 44 and the metal disc 43 are prevented from being separated from each other, the metal disc 43 and the wiring terminal 44 are pressed through the elastic force of the anti-vibration spring 45, and even if the metal disc 43 vibrates, the metal disc 43 cannot be separated from the wiring terminal 44, so that the reliability of the detection assembly can be improved.
Fig. 3 is a schematic view of a connection metal sheet provided on a terminal provided in an embodiment of the present invention. As shown in fig. 3, the two terminals 44 are provided with a connecting metal piece 46 at one end thereof in the detection cylinder 41. Therefore, the contact area between the metal disc 43 and the wiring terminal 44 can be increased, the electric connection between the wiring terminal 44 and the metal disc 43 is conveniently realized, and the reliability of the detection assembly is improved. Alternatively, the metal sheet may be semi-annular.
As shown in fig. 4, the protection device further comprises a flow meter 8, the flow meter 8 being arranged on the protection pipe 2. Because the pump is emptied, the flow of the outlet of the pump can be interrupted or interrupted, so that the flowmeter 8 can be used for detecting whether the pump is evacuated or not, and reminding workers to stop the pump in time so as to prevent the pump from being damaged greatly.
As shown in fig. 4, the protection device further comprises a check valve 5 and a shut-off valve 6, the outlet end of the protection pipe 2 is communicated with the inlet end of the check valve 5, and the outlet end of the check valve 5 is communicated with the inlet end of the shut-off valve 6. The other end of the protection pipeline 2 is provided with a check valve 5 for limiting the backflow of fluid flowing out of the pump, so that the tuning fork switch and the detection assembly can directly detect whether the fluid in the pump is full or not, and the reliability of the protection device is improved. The shut-off valve 6 is used for plugging the protection pipeline 2 before the pump is started, so that the fluid in the protection pipeline 2 is filled with the fluid without leaking, thereby creating conditions for the starting of the pump. After the pump is started, the shut-off valve 6 is opened to ensure the fluid in the protection pipeline 2 to circulate.
As shown in fig. 4, the protection device further comprises a pressure gauge 7, and the pressure gauge 7 is arranged on the protection pipe 2. Because the pump is emptied, the pressure fluctuation at the outlet of the pump is large, so the pressure gauge 7 can also be used for detecting whether the pump is evacuated, and reminding workers to stop the pump in time so as to prevent the pump from being damaged greatly. When the pump normally works and the pressure fluctuation of the outlet of the pump is in a normal range, the pressure gauge 7 is used for detecting the pressure in the protection pipeline 2, so that a technician can know the working pressure condition of the protection pipeline 2 in time.
Optionally, the protection device may further include an alarm, the alarm is connected to the tuning fork switch, and the alarm may give an alarm when the pump is emptied, so as to remind a worker to perform timely treatment, so that the pump can be restored to normal operation as soon as possible. The alarm may be, but is not limited to, a speaker, a buzzer, and a warning light.
Specifically, the vibration joint 12 is a ceramic vibrator. Because the vibration frequency of the ceramic vibrator is not affected by the abrupt change of the temperature and is not affected by the physical and chemical characteristics of the measured medium, the tuning fork switch with the ceramic vibrator has higher reliability and is convenient to use.
As shown in fig. 5, the protection pipe 2 is provided at both ends thereof with coupling flanges 24. The arrangement of the connecting flange facilitates the connection of the protection pipeline 2 with the outlet pipeline and the transportation pipeline of the pump.
Embodiments of the present invention provide a pump assembly comprising a pump and a protection device as described hereinbefore, the protection tube of the protection device being in communication with the outlet of the pump. Wherein, the protection pipeline is established in pump export position and is communicated with the pump, through with protection pipeline and pump intercommunication, the vibration tuning fork cartridge of tuning fork switch is in the protection pipeline, the vibration tuning fork with certain frequency vibration and, because the fluid is full of in the protection pipeline with not full of the vibration frequency of vibration tuning fork different, the tuning fork switch detects the vibration frequency of vibration tuning fork, judge whether to be full of fluid in the protection pipeline according to the vibration frequency. When the fluid in the protection pipeline is not full, the tuning fork switch outputs a signal to the first controller, and the first controller controls the pump to stop working, so that the pump is prevented from being pumped out, and the pump is protected.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A protection device of a pump is characterized in that,
the protection device includes: tuning fork switch (1), determine module (4), be used for with pump export protection pipeline (2) that communicate and be used for controlling first controller (3) that the pump stopped, be equipped with through-hole (21) on the pipe wall of protection pipeline (2), vibration tuning fork (11) cartridge of tuning fork switch (1) is in through-hole (21), protection pipeline (2) with vibration joint (12) sealing connection of tuning fork switch (1), tuning fork switch (1) with the signal input part of first controller (3) is connected, determine module (4) include: a detection cylinder (41), a piston (42), a metal disc (43) and two terminals (44), wherein the detection cylinder (41) is located on the outer wall of the protection pipeline (2) and is communicated with the protection pipeline (2), the two terminals (44) are inserted on the inner wall of the detection cylinder (41), the two terminals (44) are located between the piston (42) and the metal disc (43), one terminal (44) of the two terminals (44) is connected with the signal output end of the first controller (3), the other terminal (44) of the two terminals (44) is used for being connected with a pump, the piston (42) is arranged in the detection cylinder (41) in a sliding manner, the metal disc (43) and the protection pipeline (2) are located on two opposite sides of the piston (42), and the metal disc (43) is connected with the piston (42), the metal plate (43) is movable with the piston (42) between a first position and a second position, the metal plate (43) being in contact with the two terminals (44) when the metal plate (43) is in the first position, and the metal plate (43) being separated from the two terminals (44) when the metal plate (43) is in the second position.
2. The protection device according to claim 1, wherein a mounting pipe (22) communicated with the through hole (21) is arranged on the pipe wall of the protection pipeline (2), a first flange (23) is arranged at one end of the mounting pipe (22), a second flange (16) is arranged on the outer wall of the shell (15) of the tuning fork switch (1), and the first flange (23) and the second flange (16) are detachably connected.
3. The protection device according to claim 2, characterized in that it further comprises an annular sealing ring (20), said annular sealing ring (20) being located between said first flange (23) and said second flange (16).
4. The protection device of claim 1,
the detection assembly (4) further comprises an anti-vibration spring (45), and one end of the anti-vibration spring (45) is connected with the metal disc (43);
the detection cylinder (41) comprises an open end and a closed end which are opposite, the open end is connected with the protection pipeline (2), and the inner wall of the closed end is connected with the other end of the anti-vibration spring (45).
5. The protection device according to claim 1, characterized in that the two terminals (44) are each provided with a connection metal sheet (46) at one end inside the detection cartridge (41).
6. The protection device according to any one of claims 1 to 5, characterized in that it further comprises a flow meter (8), said flow meter (8) being arranged on said protection pipe (2).
7. A protection device according to any one of claims 1-5, characterized in that the protection device further comprises a non-return valve (5) and a shut-off valve (6), the outlet end of the protection pipe (2) communicating with the inlet end of the non-return valve (5), the outlet end of the non-return valve (5) communicating with the inlet end of the shut-off valve (6).
8. The protection device according to any one of claims 1 to 5, characterized in that it further comprises a pressure gauge (7), said pressure gauge (7) being arranged on said protection pipe (2).
9. The protection device according to any one of claims 1-5, wherein the vibrating joint (12) of the tuning fork switch (1) is a ceramic vibrator.
10. A pump assembly, characterized in that it comprises a pump and a protection device according to any one of claims 1-9, the protection tube (2) of which communicates with the outlet of the pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811459579.2A CN111255704B (en) | 2018-11-30 | 2018-11-30 | Pump protection device and pump assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811459579.2A CN111255704B (en) | 2018-11-30 | 2018-11-30 | Pump protection device and pump assembly |
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| Publication Number | Publication Date |
|---|---|
| CN111255704A CN111255704A (en) | 2020-06-09 |
| CN111255704B true CN111255704B (en) | 2021-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811459579.2A Active CN111255704B (en) | 2018-11-30 | 2018-11-30 | Pump protection device and pump assembly |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113125075A (en) * | 2021-04-20 | 2021-07-16 | 陈亮 | Leakage-proof testing device for heating and ventilation pipeline |
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| CN206801902U (en) * | 2017-06-22 | 2017-12-26 | 国网上海市电力公司 | A kind of transformer station's centrifugation apparatus for controlling pump of the anhydrous idle running protection of band |
| CN208057424U (en) * | 2018-03-10 | 2018-11-06 | 浙江申南塑胶有限公司 | A kind of self-priming plastic centrifugal pumps of GRPP |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0624742A1 (en) * | 1993-05-08 | 1994-11-17 | MASCHINENFABRIK HENNECKE GmbH | Shaft passage sealing with a barrier fluid |
| CN201851325U (en) * | 2010-10-28 | 2011-06-01 | 浙江江山化工股份有限公司 | Protecting device of unloading pump |
| CN102606491A (en) * | 2012-03-26 | 2012-07-25 | 渤海大学 | Self-priming self-control method and device for centrifugal water pump |
| CN203224273U (en) * | 2013-03-21 | 2013-10-02 | 深圳市金铃水工业自动化系统有限公司 | Automatic judgment device during cutting off of water supply |
| CN204572464U (en) * | 2015-04-07 | 2015-08-19 | 大庆市普罗石油科技有限公司 | Screw pump protective gear |
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| CN204738952U (en) * | 2015-07-02 | 2015-11-04 | 重庆建研科之杰新材料有限公司 | Reation kettle automatic protection device of pump of unloading |
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| CN111255704A (en) | 2020-06-09 |
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