CN114293623B - Check valve fault judging method and system for water supply equipment and water supply equipment - Google Patents
Check valve fault judging method and system for water supply equipment and water supply equipment Download PDFInfo
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- CN114293623B CN114293623B CN202111661645.6A CN202111661645A CN114293623B CN 114293623 B CN114293623 B CN 114293623B CN 202111661645 A CN202111661645 A CN 202111661645A CN 114293623 B CN114293623 B CN 114293623B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 258
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000012423 maintenance Methods 0.000 claims abstract description 7
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 3
- 239000008400 supply water Substances 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 description 5
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of water supply equipment, and particularly relates to a check valve fault judging method and system for water supply equipment and the water supply equipment, wherein the method comprises the following steps: s1: acquiring a pressure value of a water inlet end of the water supply equipment when the water supply equipment operates; if the pressure value in the water inlet end is increased and exceeds a preset pressure value, the water supply equipment fails in a check valve; s2: closing all the water pump units, and releasing pressure to the water supply equipment until the pressure of the water inlet end is smaller than a preset pressure value; s3: and under the same condition, independently starting the water pump units in each power pipeline one by one, and positioning the position of the fault check valve based on the running pressure value of the water inlet end of the water supply equipment. The method is simple, has strong operability, can position the fault point of the check valve, can avoid secondary faults of equipment caused by the fault of the check valve, can ensure water supply after the check valve is damaged, and can provide time for maintenance personnel to maintain.
Description
Technical Field
The invention belongs to the technical field of water supply equipment, and particularly relates to a check valve fault judging method and system for water supply equipment and the water supply equipment.
Background
A check valve is usually arranged behind the water pump in the water supply equipment to prevent the medium from flowing backwards, and once the check valve is damaged, the water pump can be damaged, and in severe cases, the air inlet of the water pump can be sealed by a machine. In order to reduce the damage probability of the water pump, the existing water supply equipment generally adopts a conservation scheme to cope with the damage of the check valve, and particularly, the water pump is generally closed to prevent the water pump from circulating and pressurizing, and the check valve installed at the water inlet is used for protecting the municipal water supply pipeline from being influenced by outlet pressure. However, the above method still has the following drawbacks: 1) The pipe section in front of the water pump such as the steady flow tank is not protected, so that the pipe section is subjected to high pressure influence caused by failure backflow of the check valve, and the pipe section in front of the water pump can be burst when serious; 2) After the water pump is closed, the water supply equipment can stop normal water supply so as to influence normal use; 3) The positioning of the fault check valve cannot be realized, and inconvenience is brought to subsequent maintenance.
Disclosure of Invention
The invention aims to provide a check valve fault judging method and system for water supply equipment and the water supply equipment, so as to solve at least one problem existing in the prior art.
In one aspect, the present invention provides a method for determining a failure of a check valve for a water supply apparatus, the water supply apparatus including a plurality of power lines connected in parallel between a water inlet end and a water outlet end thereof, the power lines being connected to a water pump unit and the check valve, comprising: s1: acquiring a pressure value of a water inlet end of the water supply equipment when the water supply equipment operates; if the pressure value in the water inlet end is increased and exceeds a preset pressure value, the water supply equipment fails in a check valve; s2: closing all the water pump units, and releasing pressure to the water supply equipment until the pressure of the water inlet end is smaller than a preset pressure value; s3: and under the same condition, independently starting the water pump units in each power pipeline one by one, and positioning the position of the fault check valve based on the running pressure value of the water inlet end of the water supply equipment.
The check valve failure determination method for a water supply apparatus as described above, further preferably, S3 specifically includes: s31: independently starting a water pump unit on a power pipeline, and recording pressure values in a water inlet end and a water outlet end; s32: judging whether the pressure value of the water inlet end exceeds a preset threshold value, if not, the check valve on the current started power pipeline fails, and the fault screening is completed; if yes, continuing to carry out the next step;
s33: the water supply equipment is decompressed until the pressure of the water inlet end is smaller than a preset pressure value; s34: repeating S31-S33 until the fault check valve is positioned, or all power lines are screened; if all power lines are screened for failure to locate the check valve failure location, the number of check valve failures exceeds two.
In the above check valve failure determination method for a water supply device, it is further preferable that step S34 further includes recording the number of times of pressure relief after the occurrence of the failure of the water supply device, and determining whether the number of times of pressure relief is greater than the number of water pump units, if so, all the power lines are screened, and if not, the opposite is true.
The check valve failure judging method for a water supply apparatus as described above, further preferably, step S34 further includes performing shutdown maintenance on the water supply apparatus when the number of check valve failures exceeds two.
The check valve malfunction judging method for a water supply apparatus as described above, further preferably, step S32 further includes turning on the water pump assembly on the same power line as the malfunctioning check valve for normal water supply, after locating the malfunctioning position of the check valve.
On the other hand, the invention also discloses a check valve fault judging system for water supply equipment, which is used for realizing the check valve fault judging method of any one of the above steps, and comprises the following steps: the monitoring unit comprises a first pressure gauge and a second pressure gauge which are respectively arranged at the water inlet end and the water outlet end of the water supply equipment; the pressure release valve is arranged at the water inlet end of the water supply equipment; and the control unit is electrically connected with the water pump unit, the first pressure gauge, the second pressure gauge and the pressure relief valve respectively.
The check valve failure determination system for a water supply apparatus as described above further preferably, the relief valve is an electromagnetic relief valve.
The check valve failure determination system for a water supply apparatus as described above further preferably, the first pressure gauge and the second pressure gauge are voltage gauges or pressure transmitters.
The check valve failure determination system for a water supply apparatus as described above, further preferably, the control unit includes: the driving unit is used for controlling the starting and stopping of the water pump unit and the pressure relief valve; the acquisition unit is used for acquiring pressure data measured in the first pressure gauge and the second pressure gauge; the comparison unit is used for comparing the pressure data in the first pressure gauge with a preset threshold value and obtaining a comparison result; a result determination unit that sends an execution instruction to the drive unit based on the comparison result; and the counting unit is used for recording the start and stop times of the pressure relief valve and sending the start and stop times to the result judging unit.
In still another aspect, the present invention also provides a water supply apparatus including the check valve failure determination system for a water supply apparatus as described above, for implementing the check valve failure determination method as described in any one of the above.
According to the check valve fault judging method for the water supply equipment, firstly, fault judgment is achieved through pressure value changes of the water inlet end and the water outlet end of the water supply equipment when the check valve is in fault, secondly, the water supply equipment is decompressed to avoid secondary damage of water pressure to the water supply equipment, and thirdly, each power pipeline is started one by one to obtain running pressure values of the water inlet end and the water outlet end of the water supply equipment to achieve fault positioning of the check valve. The method is simple and high in operability, the position of the fault check valve can be positioned, secondary faults of equipment caused by the check valve fault are avoided, water supply can be ensured after the check valve is damaged, and time is provided for maintenance staff to maintain.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a check valve failure judging method for a water supply apparatus according to the present invention;
FIG. 2 is a flow chart of the abort water valve fault type determination of FIG. 1;
FIG. 3 is a schematic view of a water supply apparatus according to the present invention;
FIG. 4 is a schematic diagram of the non-faulty power line of FIG. 3 in operation;
FIG. 5 is a schematic diagram of the faulty power line of FIG. 3 in operation.
Reference numerals illustrate:
the device comprises a 1-pressure stabilizing tank, a 2-water pump unit, a 3-check valve, a 4-water inlet main pipe, a 5-water outlet main pipe, a 6-first pressure gauge, a 7-second pressure gauge, an 8-pressure relief valve and a 9-water inlet check valve.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in the present invention will be understood in detail by those skilled in the art.
A check valve malfunction judging method and system for a water supply apparatus according to the present invention will be described with reference to fig. 1 to 5. Specifically, the check valve fault judging method provided by the invention is mainly used in water supply equipment, wherein the water supply equipment comprises a plurality of power pipelines connected in parallel between a water inlet end and a water outlet end of the water supply equipment, the power pipelines are connected with a water pump unit 2 and a check valve 3, the water inlet end of the water supply equipment is connected with a water inlet main pipe and is communicated with a municipal pipe network through the water inlet main pipe 4 and a water inlet check valve 9 for water supply, the water outlet end is connected with a water outlet main pipe 5 and is communicated with a user pipe network through the water outlet main pipe for water removal supply, the water pump unit 2 is used for pressurizing the water in the water inlet main pipe 4 and conveying the water into the water outlet main pipe 5 through the check valve 3 so as to realize user water supply, and specifically, the use quantity of the water pump unit 2 is determined based on the user quantity of the user pipe network. In addition, a steady flow tank arranged between the incoming water check valve 9 and the water pump unit 2 is also arranged at the water inlet end of the power pipeline in the water supply equipment and is used for supplying water for the water pump unit 2 in a steady pressure manner.
Specifically, as shown in fig. 1 to 5, the check valve failure judging method for a water supply device of the present invention is mainly used for judging whether the check valve 3 on a power line fails or not, and specifically comprises the following steps:
s1: acquiring a pressure value of a water inlet end of the water supply equipment when the water supply equipment operates; if the pressure value in the water inlet end is increased and exceeds the preset pressure value, the water supply equipment fails the check valve 3;
s2: closing all the water pump units 2, and releasing pressure to the water supply equipment until the pressure of the water inlet end is smaller than a preset pressure value;
s3: under the same condition, the water pump units 2 in each power pipeline are independently started one by one, and the position of the fault check valve is positioned based on the running pressure value of the water inlet end of the water supply equipment.
In the S1, the pressure value of the water inlet end of the water supply equipment is the pressure value of the pressure stabilizing tank 1, the pressure value of the water outlet end is the pipeline pressure value after being pressurized by the water pump unit 2, specifically, the pressure value of the water inlet end is P1, the pressure value of the water outlet end is P2, and the P1< P2 is shown in the figure 3 when the water supply equipment normally operates due to the influence of the check valve 3 in the power pipeline; however, once any one of the check valves 3 in the power pipeline fails, high-pressure water at the water outlet end flows back to the water inlet end through the failed check valve 3, and the pressure value P1 at the water outlet end is raised as shown in FIG. 4. Specifically, a preset pressure value P3 is set, and under normal conditions, P1< P3< P2, once the pressure value of the water inlet end is greater than the preset pressure value, that is, P1 is greater than or equal to P3, it is indicated that the check valve 3 of the water supply equipment fails.
In S2, once a fault occurs, all the water pump units 2 are turned off, and the water supply device is subjected to pressure relief treatment until the pressure value at the water inlet end returns to normal, i.e., P1< P3. Mainly, step S2 is used for maintaining the water supply device, so as to avoid secondary damage to the pipeline of the water supply device caused by the high-pressure water flowing back.
S3 is used for failure determination of the check valve 3 to confirm the damaged condition of the check valve 3, and S3 specifically includes:
s31: independently starting a water pump unit 2 on a power pipeline, and recording pressure values in a water inlet end and a water outlet end;
s32: judging whether the pressure value of the water inlet end exceeds a preset threshold value, if not, the check valve 3 on the currently started power pipeline fails, the running condition in the water supply equipment is shown in the figure 5, and the fault screening is completed; if yes, continuing to carry out the next step;
s33: the water supply equipment is decompressed until the pressure of the water inlet end is smaller than a preset pressure value;
s34: repeating S31-S33 until the fault check valve 3 is positioned, or all power pipelines are screened; if all the power lines are screened for failure to locate the failed position of the check valve 3, the number of failures of the check valve 3 exceeds two.
Steps S31-S34 detail the failure determination step of the check valve 3 and the analysis of the determination results, and achieve positioning of the check valve 3 when a single check valve 3 fails, and give the determination results when at least two check valves 3 fail, for further maintenance.
Further, step S32 further includes turning on the water pump unit 2 on the corresponding power line to normally supply water after the defective position of the check valve 3 is located. Specifically, the judging result corresponding to the step is that the single check valve 3 fails, and at this time, normal water supply can be realized only by starting the water pump unit 2 on the power pipeline corresponding to the failed check valve 3, so that the influence on the use of a user is avoided.
Further, step S34 further includes recording the number of times of pressure relief of the water supply device, and determining whether the number of times of pressure relief is greater than the number of water pump units 2, if yes, all the power lines are screened, if no, the opposite is true. Of course, counting may also be achieved by other methods, such as numbering the water pump assemblies 2 in sequence and starting the water pump assemblies 2 in the numbering sequence until the last number.
Further, step S34 further includes performing a shutdown maintenance of the water supply apparatus when the number of failures of the check valves 3 exceeds two.
The embodiment also discloses a check valve fault judging system for water supply equipment, which is used for realizing the check valve fault judging method, and comprises the following steps:
the monitoring unit comprises a first pressure gauge 6 arranged at the water inlet end of the water supply device and a second pressure gauge 7 arranged at the water outlet end of the water supply device;
the pressure release valve 8 is arranged at the water inlet end of the water supply equipment;
and the control unit is electrically connected with the water pump unit 2, the first pressure gauge 6, the second pressure gauge 7 and the pressure relief valve 8 respectively.
The first pressure gauge 6 is used for monitoring the pressure of the water inlet end of the water supply device, and the second pressure gauge 7 is used for monitoring the pressure of the water outlet end of the water supply device; specifically, the first pressure gauge 6 and the second pressure gauge 7 are electric contact pressure gauges or pressure transmitters, and are used for converting pressure signals into electric signals and transmitting the electric signals to the control unit.
The pressure release valve 8 is connected with the surge tank 1 and is used for carrying out pressure release treatment on the water supply equipment, the set action pressure is a preset pressure value, and once the pressure value in the water supply equipment exceeds the set action pressure, the pressure release valve 8 starts to release pressure. Specifically, the pressure release valve 8 is an electromagnetic pressure release valve 8, and is used for starting and releasing the pressure in the water supply equipment under the control of the control unit.
The control unit is used for controlling to realize the check valve fault judging method, and concretely comprises the following steps:
the driving unit is used for controlling the starting and stopping of the water pump unit 2 and the pressure relief valve 8;
an acquisition unit for acquiring pressure data measured in the first pressure gauge 6 and the second pressure gauge 7;
the comparing unit is used for comparing the pressure value of the first pressure gauge 6 acquired by the acquiring unit with a preset threshold value to obtain a comparison result;
and a result determination unit that sends an execution instruction to the drive unit based on the comparison result.
Further, the control unit further comprises a counting unit, and the counting unit is used for recording the start and stop times of the pressure relief valve and sending the start and stop times to the result judging unit.
The check valve fault judging method is realized through the mutual coordination of the driving unit, the acquisition unit, the comparison unit, the result judging unit and the counting unit.
The embodiment also discloses water supply equipment, which comprises a check valve fault judging system for the water supply equipment and can realize the check valve fault judging method.
Specifically, taking the water supply device disclosed in fig. 3 as an example, the embodiment also discloses a use method of the water supply device:
the water supply equipment comprises a steady flow tank and three power pipelines, wherein the water inlet end of the steady flow tank is connected with a water inlet main pipe and is communicated with a municipal pipe network through a water inlet main pipe 4 and a water inlet check valve 9, the three power pipelines are connected in parallel, one end of each power pipeline is communicated with the steady flow tank, the other end of each power pipeline is a water outlet end connected with a water outlet main pipe, the power pipelines are connected with a water pump unit 2 and a check valve 3, and the water pump unit 2 is used for pressurizing water in the steady flow tank and conveying the water to the water outlet main pipe 5 through the check valve 3 so as to realize water supply for users. In order to realize fault judgment of the check valve, the steady flow tank is provided with a first pressure gauge 6 and a pressure relief valve 8 with a preset pressure value, the water outlet end is provided with a second pressure gauge 7, and the first pressure gauge 6, the pressure relief valve 8, the second pressure gauge 7 and the water pump unit are electrically connected with the controller. When the check valve on the power pipeline normally operates, the pressure data of the first pressure gauge is P1, the pressure value of the second pressure gauge is P2, the preset pressure value of the pressure release valve is P3, and P1 is less than P3 is less than P2.
Once the check valve fails in the power pipeline, high-pressure water pressurized by the water pump units 2 flows back to the surge tank 1 through the failure check valve, so that the pressure in the surge tank 1 is increased, namely P1 is increased, once P1 is more than or equal to P3, the pressure release valve 8 is started to release pressure, and meanwhile, the controller sends instructions to the three water pump units 2, so that the operation of the three water pump units is stopped simultaneously. When the pressure in the surge tank 1 returns to P3 or lower, the relief valve is closed. If the pressure in the pressure stabilizing tank 1 is still increased to be more than or equal to P1 and more than or equal to P3, as shown in fig. 4, the check valve fault exists in other power pipelines, the pressurized water flows back to the pressure stabilizing tank 1 through the fault check valve, at the moment, the pressure release valve 8 is started to release pressure until the pressure in the pressure stabilizing tank 1 is restored to be less than P3, and meanwhile, the controller sends an instruction to the water pump unit 2 to stop running; then, the water pump unit 2 on the second power pipeline is started through the controller, if the pressure in the surge tank 1 is not increased, namely P1< P3, as shown in fig. 5, the check valve fault exists on the power pipeline, the pressurized water cannot flow back through the check valve on the other power pipeline, and the positioning of the fault check valve is realized.
When each power pipeline is screened, namely the number of times of starting and stopping the pressure relief valve is larger than the number of power pipelines, and the fault check valves still cannot be positioned, the number of the fault check valves exceeds 1, namely the number of the fault check valves is two or more. At this time, the water supply device is turned off to be overhauled.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A check valve failure determination method for a water supply apparatus including a plurality of power lines connected in parallel between a water inlet end and a water outlet end thereof, the power lines being connected with a water pump unit and a check valve, comprising:
s1: acquiring a pressure value of a water inlet end of the water supply equipment when the water supply equipment operates; if the pressure value of the water inlet end is increased and exceeds a preset pressure value, the water supply equipment fails in a check valve;
s2: closing all the water pump units, and performing pressure relief treatment on the water supply equipment until the pressure of the water inlet end is smaller than a preset pressure value;
s3: independently starting a water pump unit in each power pipeline one by one under the same condition, and positioning the position of the fault check valve based on the running pressure value of the water inlet end of the water supply equipment;
s3 specifically comprises:
s31: independently starting a water pump unit on a power pipeline, and recording pressure values in a water inlet end and a water outlet end;
s32: judging whether the pressure value of the water inlet end exceeds a preset threshold value, if not, the check valve on the current power pipeline fails, and the fault screening is completed; if yes, continuing to carry out the next step;
s33: performing pressure relief treatment on the water supply equipment until the pressure of the water inlet end is smaller than a preset pressure value;
s34: repeating S31-S33 until the fault check valve is positioned, or all power lines are screened; if all power lines are screened for failure to locate the check valve failure location, the number of check valve failures exceeds two.
2. The method according to claim 1, wherein step S34 further comprises recording the number of times of pressure relief after the water supply failure occurs, and judging whether the number of times of pressure relief is greater than the number of water pump units, if yes, all power lines are screened, and if not, the opposite is true.
3. The check valve failure judging method for a water supply apparatus according to claim 1, wherein step S34 further comprises performing a shutdown maintenance for the water supply apparatus when the number of check valve failures exceeds two.
4. The method of claim 1, wherein step S32 further comprises turning on the water pump assembly on the same power line as the failed check valve to normally supply water after locating the failed position of the check valve.
5. A check valve failure determination system for a water supply apparatus, characterized by being configured to implement the check valve failure determination method of any one of claims 1 to 4, comprising:
the monitoring unit comprises a first pressure gauge arranged at the water inlet end of the water supply equipment;
the pressure release valve is arranged at the water inlet end of the water supply equipment;
the control unit is electrically connected with the water pump unit, the first pressure gauge and the pressure relief valve respectively;
the control unit includes:
the driving unit is used for controlling the starting and stopping of the water pump unit and the pressure relief valve;
the acquisition unit is used for acquiring the pressure data measured in the first pressure gauge;
the comparing unit is used for comparing the pressure value of the first pressure gauge acquired by the acquiring unit with a preset threshold value to acquire a comparison result;
a result determination unit that sends an execution instruction to the drive unit based on the comparison result;
and the counting unit is used for recording the start and stop times of the pressure relief valve and sending the start and stop times to the result judging unit.
6. The check valve failure determination system for a water supply apparatus according to claim 5, wherein the relief valve is an electromagnetic relief valve.
7. The check valve failure determination system for a water supply apparatus according to claim 5, wherein the first pressure gauge is an electric pressure gauge or a pressure transmitter.
8. A water supply apparatus comprising the check valve failure judgment system for a water supply apparatus according to any one of claims 5 to 7 for implementing the check valve failure judgment method according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111661645.6A CN114293623B (en) | 2021-12-30 | 2021-12-30 | Check valve fault judging method and system for water supply equipment and water supply equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111661645.6A CN114293623B (en) | 2021-12-30 | 2021-12-30 | Check valve fault judging method and system for water supply equipment and water supply equipment |
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| CN114293623A CN114293623A (en) | 2022-04-08 |
| CN114293623B true CN114293623B (en) | 2024-03-19 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003042089A (en) * | 2001-07-31 | 2003-02-13 | Sayama Seisakusho:Kk | Diagnostic method for check valve and/or pressure tank and water supplying device |
| JP2005098125A (en) * | 2003-09-22 | 2005-04-14 | Hitachi Unisia Automotive Ltd | Diagnostic equipment of air supply device |
| CN105840480A (en) * | 2016-05-24 | 2016-08-10 | 史仁朋 | Closed type four-stage series-parallel connection pump station system and control method thereof |
| CN106151004A (en) * | 2016-07-30 | 2016-11-23 | 陈辉 | A kind of water-aspirator pressure surge tank fault detection method and water pump |
| JP2020002788A (en) * | 2018-06-25 | 2020-01-09 | 株式会社川本製作所 | Water supply device |
| CN213022277U (en) * | 2020-07-29 | 2021-04-20 | 上海连成环境工程设备有限公司 | Check valve failure detection device |
-
2021
- 2021-12-30 CN CN202111661645.6A patent/CN114293623B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003042089A (en) * | 2001-07-31 | 2003-02-13 | Sayama Seisakusho:Kk | Diagnostic method for check valve and/or pressure tank and water supplying device |
| JP2005098125A (en) * | 2003-09-22 | 2005-04-14 | Hitachi Unisia Automotive Ltd | Diagnostic equipment of air supply device |
| CN105840480A (en) * | 2016-05-24 | 2016-08-10 | 史仁朋 | Closed type four-stage series-parallel connection pump station system and control method thereof |
| CN106151004A (en) * | 2016-07-30 | 2016-11-23 | 陈辉 | A kind of water-aspirator pressure surge tank fault detection method and water pump |
| JP2020002788A (en) * | 2018-06-25 | 2020-01-09 | 株式会社川本製作所 | Water supply device |
| CN213022277U (en) * | 2020-07-29 | 2021-04-20 | 上海连成环境工程设备有限公司 | Check valve failure detection device |
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| CN114293623A (en) | 2022-04-08 |
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