CN115655701B - Flow-limiting check valve function test method and system - Google Patents
Flow-limiting check valve function test method and system Download PDFInfo
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Abstract
The invention discloses a method and a system for testing the function of a flow-limiting check valve, wherein the method comprises the following steps: starting each parallel water pump on the tested main pipeline, and obtaining the total water flow of the tested main pipeline after the water pump runs stablyQ 0 Main pipe inlet pressure P in And main pipe outlet pressure P out To obtain the total lift H 0 ＝(P out ‑P in ) ρg, where ρ is the water density and g is the free fall acceleration; starting the water pump to be tested, closing other water pumps connected in parallel, and obtaining the water flow Q of the branch where the water pump to be tested is located after the water pump to be tested runs stably 1 Branch inlet pressure P 1in And branch outlet pressure P 1out Obtaining the tested water pump lift H 1 ＝(P 1out ‑P 1in ) - ρg; comparative H 1 And H 0 If H 1 ＝H 0 If H, the flow-limiting check valve of the detected branch is normal in flow-limiting function 1 <H 0 The flow-limiting check valve of the tested branch is abnormal in flow-limiting function. According to the invention, the on-site function test of the flow limiting check valve can be realized without dismantling the flow limiting check valve.
Description
Technical Field
The invention relates to the technical field of check valves, in particular to a flow-limiting check valve function test method and system.
Background
The flow-limiting check valve is mainly used for being arranged at the water pump outlet when the pumps are used in parallel, and has the functions of limiting the working flow of the water pump and preventing backflow of the stopped pump. The flow limiting principle of the valve is as follows: according to the working point lift designed by the water pump, when the working lift of the water pump is lower than the control lift, the valve is closed, so that the actual working lift is increased; when the working lift of the water pump is larger than the set lift, the valve is fully opened, and the valve resistance is extremely small. The working flow of the water pump is limited, the load of the motor is limited, and the initial valve working lift can be set according to the design working condition point of the water pump when the valve is installed.
However, for how to confirm whether the flow-limiting check valve plays an expected flow-limiting and pressure-regulating role in actual use, so that the water pump is at a high-efficiency operation working condition point, no test method capable of confirming whether the flow-limiting function of the water pump works normally exists at present. Especially for existing buildings running for many years, the valve is easy to have component faults, so that the actuating mechanism cannot play an expected adjusting role.
Therefore, there is a need to design a method and a system for testing the function of a flow-limiting check valve to solve the above problems.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a method and a system for testing the function of a flow-limiting check valve, which can realize the field function test of the flow-limiting check valve under the condition that the flow-limiting check valve is not required to be dismantled.
In order to achieve the above object, the present invention provides a method for testing the function of a flow-limiting check valve, comprising the steps of:
starting each parallel water pump on the main pipeline to be tested, and obtaining the total water flow Q of the main pipeline to be tested after the water pump runs stably 0 Main pipe inlet pressure P in And main pipe outlet pressure P out To obtain the total lift H 0 ＝(P out -P in ) ρg, where ρ is the water density and g is the free fall acceleration;
starting the water pump to be tested, closing other water pumps connected in parallel, and obtaining the water flow Q of the branch where the water pump to be tested is located after the water pump to be tested runs stably 1 Branch inlet pressure P 1in And branch outlet pressure P 1out Obtaining the tested water pump lift H 1 ＝(P 1out -P 1in )/ρg；
Comparative H 1 And H 0 If H 1 ＝H 0 If H, the flow-limiting check valve of the detected branch is normal in flow-limiting function 1 <H 0 The flow-limiting check valve of the tested branch is abnormal in flow-limiting function.
In some embodiments, the comparison H 1 And H 0 If H 1 ＝H 0 If H, the flow-limiting check valve of the detected branch is normal in flow-limiting function 1 <H 0 The flow limiting check valve of the detected branch circuit has abnormal flow limiting function, and specifically comprises the following steps:
plotting a line performance curve h=sq 2 Wherein, the flow Q is taken as an abscissa, the lift H is taken as an ordinate, and the running state point (Q 1 ，H 1 ) Comparison of H 1 And H 0 If H 1 ＝H 0 If H, the flow-limiting check valve of the detected branch is normal in flow-limiting function 1 <H 0 The flow-limiting check valve of the tested branch is abnormal in flow-limiting function.
In some embodiments, the plotted line performance curve h=sq 2 Wherein, the flow Q is taken as an abscissa, the lift H is taken as an ordinate, and the running state point (Q 1 ，H 1 ) Comparison of H 1 And H 0 If H 1 ＝H 0 If H, the flow-limiting check valve of the detected branch is normal in flow-limiting function 1 <H 0 After the flow limiting check valve of the tested branch circuit has abnormal flow limiting function, the method further comprises the steps of:
point of passing (Q) 1 ，H 1 ) The intersection point of the vertical line of the ordinate axis and the line performance curve is denoted as (Q) 1 ’，H 1 ) Comparative Q 1 And Q 1 ' if Q 1 ＝Q 1 ' the flow-limiting check valve of the branch to be tested has no regulation function, if Q 1 <Q 1 ' the restriction check valve of the branch under test plays a part in the regulation.
In some embodiments, the passing point (Q 1 ，H 1 ) The intersection point of the vertical line of the ordinate axis and the line performance curve is denoted as (Q) 1 ’，H 1 ) Comparative Q 1 And Q 1 ' if Q 1 ＝Q 1 ' the flow-limiting check valve of the branch to be tested has no regulation function, if Q< 1 Q 1 ' after the flow limiting check valve of the tested branch has a part of adjusting function, the method further comprises the steps of:
closing the water pump to be tested, starting the other water pump to be tested, and obtaining the water flow Q of the branch where the other water pump to be tested is positioned after the other water pump to be tested runs stably 2 Inlet pressure P of the other branch 2in And another branch outlet pressure P 2out Obtaining the lift H of another tested water pump 2 ＝(P 2out -P 2in )/ρg；
Comparative H 2 And H 0 If H 2 ＝H 0 If H, the flow-limiting check valve of the other branch to be tested has normal flow-limiting function 2 <H 0 The limit of the other branch circuit to be testedThe flow check valve has abnormal flow limiting function;
and circulating in this way until the detection of all the water pumps connected in parallel is completed.
In some embodiments, the comparison H 2 And H 0 If H 2 ＝H 0 If H, the flow-limiting check valve of the other branch to be tested has normal flow-limiting function 2 <H 0 The flow limiting check valve of the other detected branch circuit has abnormal flow limiting function, and the method specifically comprises the following steps:
on the same graph, another measured water pump running state point (Q 2 ，H 2 ) Comparison of H 2 And H 0 If H 2 ＝H 0 If H, the flow-limiting check valve of the other branch to be tested has normal flow-limiting function 2 <H 0 The flow limiting check valve of the other branch to be tested has abnormal flow limiting function;
point of passing (Q) 2 ，H 2 ) The intersection point of the vertical line of the ordinate axis and the line performance curve is denoted as (Q) 2 ’，H 2 ) Comparative Q 2 And Q 2 ' if Q 2 ＝Q 2 ' the flow-limiting check valve of the other branch to be tested has no regulation action, if Q 2 <Q 2 ' the restriction check valve of the other branch under test plays a part in the regulation.
In some embodiments, the parallel water pumps on the main pipeline to be tested are started, and after the water pumps are stable in operation, the total water flow Q of the main pipeline to be tested is obtained 0 Main pipe inlet pressure P in And main pipe outlet pressure P out To obtain the total lift H 0 ＝(P out -P in ) And (p) g, wherein p is the water density, and g is the free falling acceleration, and the method further comprises the following steps:
a flow detection device is arranged on the main pipeline to be detected and is used for acquiring the total water flow Q of the main pipeline to be detected 0 ；
An inlet pressure detection device is arranged at the inlet end of the main pipeline to be detected and is used for acquiring the inlet pressure P of the main pipe in ；
In the main pipeline to be testedAn outlet pressure detection device is arranged at the outlet end of the main pipe and is used for acquiring the outlet pressure P of the main pipe in 。
In some embodiments, the flow detection device is an ultrasonic flow meter;
and/or the inlet pressure detection device is a pressure gauge;
and/or, the outlet pressure detection device is a pressure gauge.
According to another aspect of the present invention, there is further provided a flow-restricting check valve function test system for implementing the flow-restricting check valve function test method as set forth in any one of the above, including:
the main pipeline comprises a main pipeline water inlet pipe and a main pipeline water outlet pipe, the main pipeline water inlet pipe is provided with an inlet pressure detection device, and the main pipeline water outlet pipe is provided with an outlet pressure detection device;
a plurality of branch pipelines which are arranged in parallel between the main pipeline water inlet pipe and the main pipeline water outlet pipe,
the water pumps are respectively arranged on each branch pipeline;
the branch valves are respectively arranged at the water inlet end of each branch pipeline;
the plurality of flow limiting check valves are respectively arranged at the water outlet end of each branch pipeline;
the flow detection device is arranged on the main pipeline and used for acquiring the total water flow Q of the main pipeline to be detected 0 。
In some embodiments, the flow detection device is an ultrasonic flow meter;
and/or the inlet pressure detection device is a pressure gauge;
and/or, the outlet pressure detection device is a pressure gauge.
In some embodiments, further comprising:
and the drawing device is used for drawing a pipeline performance curve graph.
Compared with the prior art, the flow-limiting check valve function test method and system provided by the invention have the following beneficial effects:
according to the flow limiting check valve function test method provided by the invention, the flow limiting function of the flow limiting check valve is tested, the on-site function test is performed under the condition that the flow limiting check valve does not need to be dismantled, whether the flow limiting function of the flow limiting check valve is normal or not is analyzed through the later data processing, and the flow limiting fault diagnosis of the flow limiting check valve is conveniently performed in the practical engineering application; the whole test process does not need to disassemble the pipeline, and is simple to operate and high in test precision.
Drawings
The above features, technical features, advantages and implementation of the present invention will be further described in the following description of preferred embodiments with reference to the accompanying drawings in a clear and easily understood manner.
FIG. 1 is a flow chart of a method of testing the function of a check valve of the present invention;
FIG. 2 is a flow restriction check valve flow restriction function determination schematic of a preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of the operation of the check valve of the preferred embodiment of the present invention;
fig. 4 is a schematic structural view of a check valve function test system according to a preferred embodiment of the present invention.
Reference numerals illustrate:
a main pipeline water inlet pipe 1, a main pipeline water outlet pipe 2, an inlet pressure detection device 3, an outlet pressure detection device 4, a branch pipeline 5, a water pump 6, a branch valve 7 and a flow limiting check valve 8.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
For simplicity of the drawing, only the parts relevant to the invention are schematically shown in each drawing, and they do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In this context, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; 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 above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, in the description of the present application, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
In one embodiment, referring to fig. 1 to 4 of the specification, the method for testing the function of the flow-limiting check valve provided by the invention comprises the following steps:
s100, starting each parallel water pump on the main pipeline to be tested, and obtaining the total water flow Q of the main pipeline to be tested after the water pumps run stably 0 Main pipe inlet pressure P in And main pipe outlet pressure P out To obtain the total lift H 0 ＝(P out -P in ) ρg, where ρ is the water density and g is the free fall acceleration;
specifically, all the parallel water pumps on the main pipeline to be tested are started, and a flow detection device is arranged on a straight pipe section of the main pipeline to be tested, which is far away from the local resistance component. After the water pump is stable in operation, the water pumps are connected in parallelRunning, wherein the inlet pressure and the outlet pressure of each water pump are consistent at the moment, and the total water flow Q of the tested main pipeline when the running of the water pump is stable is recorded 0 Main pipe inlet pressure P in And main pipe outlet pressure P out The total lift H can be obtained 0 ＝(P out -P in ) ρg, where ρ is the water density and g is the free-fall acceleration.
S200, starting the water pump to be tested, closing other water pumps connected in parallel, and obtaining the water flow Q of the branch where the water pump to be tested is located after the water pump to be tested runs stably 1 Branch inlet pressure P 1in And branch outlet pressure P 1out Obtaining the tested water pump lift H 1 ＝(P 1out -P 1in )/ρg；
Specifically, the water pump to be tested is started, other water pumps connected in parallel are closed, a flow detection device is arranged on the branch pipeline to be tested, and after the water pump to be tested runs stably, only one water pump is started at the moment, and the inlet pressure P of the main pipe is maintained in And branch inlet pressure P 1in Consistent main pipe outlet pressure P out And branch outlet pressure P 1out The inlet pressure P of the branch can be obtained by directly passing through the inlet pressure detection device and the outlet pressure detection device on the main pipe 1in And branch outlet pressure P 1out Obtaining the tested water pump lift H 1 ＝(P 1out -P 1in )/ρg。
S300 contrast H 1 And H 0 If H 1 ＝H 0 If H, the flow-limiting check valve of the detected branch is normal in flow-limiting function 1 <H 0 The flow-limiting check valve of the tested branch is abnormal in flow-limiting function.
In this embodiment, the working principle of the flow-limiting check valve is shown in fig. 3, curve 1 is a single water pump characteristic curve, curve 2 is a parallel characteristic curve of two water pumps, and curve 3 is a pipeline performance curve. Intersection point A (Q) of curve 2 and curve 3 A ，H A ) Is the working point of the parallel operation of two water pumps, if a single water pump is operated, the working point of the water pump is the intersection point B (Q B ，H B ). If the flow limiting check valve is arranged at the outlet of the water pump, the flow limiting check valve can automatically close and moveThe pipeline resistance is increased, the pipeline performance curve is shifted leftwards to form a curve 4, and the water pump operating point is shifted from the point B to the point C (Q C ，H C ) So that H C ＝H A . If the flow limiting check valve fails due to the failure of an internal adjusting component or the setting of the initial working lift is improper, the ideal flow limiting and pressure adjusting effects cannot be achieved. In order to confirm whether the flow limiting function of the flow limiting check valve is normal, the flow limiting function of the flow limiting check valve is tested, the field function test is carried out under the condition that the flow limiting check valve is not required to be dismantled, and whether the flow limiting function of the flow limiting check valve is normal is analyzed through later data processing, so that the flow limiting fault diagnosis of the flow limiting check valve is conveniently carried out in practical engineering application; the whole test process does not need to disassemble the pipeline, and is simple to operate and high in test precision.
In one embodiment, referring to fig. 1 to 3 of the specification, the method for testing the function of the flow-limiting check valve provided by the invention comprises the following steps:
s210, starting each parallel water pump on the main pipeline to be tested, and obtaining the total water flow Q of the main pipeline to be tested after the water pumps run stably 0 Main pipe inlet pressure P in And main pipe outlet pressure P out To obtain the total lift H 0 ＝(P out -P in ) ρg, where ρ is the water density and g is the free fall acceleration;
specifically, all the parallel water pumps on the main pipeline to be tested are started, and a flow detection device is arranged on a straight pipe section of the main pipeline to be tested, which is far away from the local resistance component. After the water pump is stable in operation, because the water pumps are operated in parallel, the inlet pressure and the outlet pressure of each water pump are consistent at the moment, and the total water flow Q of the main pipeline to be tested is recorded when the water pump is stable in operation 0 Main pipe inlet pressure P in And main pipe outlet pressure P out The total lift H can be obtained 0 ＝(P out -P in ) ρg, where ρ is the water density and g is the free-fall acceleration.
S220, starting the tested water pump, closing other water pumps connected in parallel, and obtaining the water flow Q of the branch where the tested water pump is located after the tested water pump runs stably 1 Branch inlet pressure P 1in And branch outlet pressure P 1out Obtaining the tested water pump lift H 1 ＝(P 1out -P 1in )/ρg；
Specifically, the water pump to be tested is started, other water pumps connected in parallel are closed, a flow detection device is arranged on the branch pipeline to be tested, and after the water pump to be tested runs stably, only one water pump is started at the moment, and the inlet pressure P of the main pipe is maintained in And branch inlet pressure P 1in Consistent main pipe outlet pressure P out And branch outlet pressure P 1out The inlet pressure P of the branch can be obtained by directly passing through the inlet pressure detection device and the outlet pressure detection device on the main pipe 1in And branch outlet pressure P 1out Obtaining the tested water pump lift H 1 ＝(P 1out -P 1in )/ρg。
S230 plots line performance curve h=sq 2 Wherein, the flow Q is taken as an abscissa, the lift H is taken as an ordinate, and the running state point (Q 1 ，H 1 ) Comparison of H 1 And H 0 If H 1 ＝H 0 If H, the flow-limiting check valve of the detected branch is normal in flow-limiting function 1 <H 0 The flow-limiting check valve of the tested branch is abnormal in flow-limiting function.
Specifically, if the flow limiting check valve of the detected branch is determined to have normal flow limiting function, the next branch is directly detected without subsequent detection; if it is determined that the flow-limiting check valve of the branch under test is not functioning properly, then the point of passage (Q 1 ，H 1 ) The intersection point of the vertical line of the ordinate axis and the line performance curve is denoted as (Q) 1 ’，H 1 ) Comparative Q 1 And Q 1 ' if Q 1 ＝Q 1 ' it is stated that the operating point of the water pump falls on the pipeline performance curve, the flow-limiting component of the flow-limiting check valve at the outlet of the water pump is completely blocked, and no adjusting function is provided; if Q 1 <Q 1 ' it is stated that the water pump outlet restriction check valve restriction member has played a certain adjustment function, but fails to reach the design operating point.
In one embodiment, referring to fig. 1 to 3 of the specification, the method for testing the function of the flow-limiting check valve provided by the invention comprises the following steps:
s310, starting each parallel water pump on the main pipeline to be tested, and obtaining the total water flow Q of the main pipeline to be tested after the water pumps run stably 0 Main pipe inlet pressure P in And main pipe outlet pressure P out To obtain the total lift H 0 ＝(P out -P in ) ρg, where ρ is the water density and g is the free fall acceleration;
s320, starting the tested water pump, closing other water pumps connected in parallel, and obtaining the water flow Q of the branch where the tested water pump is located after the tested water pump runs stably 1 Branch inlet pressure P 1in And branch outlet pressure P 1out Obtaining the tested water pump lift H 1 ＝(P 1out -P 1in )/ρg；
S330 plots the line performance curve h=sq 2 Wherein, the flow Q is taken as an abscissa, the lift H is taken as an ordinate, and the running state point (Q 1 ，H 1 ) Comparison of H 1 And H 0 If H 1 ＝H 0 If H, the flow-limiting check valve of the detected branch is normal in flow-limiting function 1 <H 0 The flow limiting check valve of the tested branch is abnormal in flow limiting function; point of passing (Q) 1 ，H 1 ) The intersection point of the vertical line of the ordinate axis and the line performance curve is denoted as (Q) 1 ’，H 1 ) Comparative Q 1 And Q 1 ' if Q 1 ＝Q 1 ' it is stated that the operating point of the water pump falls on the pipeline performance curve, the flow-limiting component of the flow-limiting check valve at the outlet of the water pump is completely blocked, and no adjusting function is provided; if Q 1 <Q 1 ' it is stated that the water pump outlet restriction check valve restriction member has played a certain adjustment function, but fails to reach the design operating point.
S340, closing the water pump to be tested, opening the other water pump to be tested, and obtaining the water flow Q of the branch where the other water pump to be tested is located after the other water pump to be tested runs stably 2 Inlet pressure P of the other branch 2in And another branch outlet pressure P 2out Obtaining the lift H of another tested water pump 2 ＝(P 2out -P 2in )/ρg；
S350 drawing another measured water pump operation state point (Q) 2 ，H 2 ) Comparison of H 2 And H 0 If H 2 ＝H 0 If H, the flow-limiting check valve of the other branch to be tested has normal flow-limiting function 2 <H 0 The flow limiting check valve of the other branch to be tested has abnormal flow limiting function; point of passing (Q) 2 ，H 2 ) The intersection point of the vertical line of the ordinate axis and the line performance curve is denoted as (Q) 2 ’，H 2 ) Comparative Q 2 And Q 2 ' if Q 2 ＝Q 2 ' the flow-limiting check valve of the other branch to be tested has no regulation action, if Q 2 <Q 2 ' the flow-limiting check valve of the other branch to be tested plays a part in regulation;
s360 is circulated until detection of all the parallel water pumps is completed.
In the above embodiment, after the water pumps are started up and the operation of the water pumps is stable, the total water flow Q of the main pipeline is obtained 0 Main pipe inlet pressure P in And main pipe outlet pressure P out To obtain the total lift H 0 ＝(P out -P in ) And (p) g, wherein p is the water density, and g is the free falling acceleration, and the method further comprises the following steps:
a flow detection device is arranged on the main pipeline to be detected and is used for acquiring the total water flow Q of the main pipeline to be detected 0 ；
An inlet pressure detection device is arranged at the inlet end of the main pipeline to be detected and is used for acquiring the inlet pressure P of the main pipe in ；
An outlet pressure detection device is arranged at the outlet end of the main pipeline to be detected, and the outlet pressure detection device is used for acquiring the outlet pressure P of the main pipe in 。
Further, the flow detection device is an ultrasonic flowmeter;
and/or the inlet pressure detection device is a pressure gauge;
and/or, the outlet pressure detection device is a pressure gauge.
In this embodiment, the ultrasonic flowmeter is used to detect the pipeline flow, and the ultrasonic flowmeter is a non-contact meter, which can measure the medium flow with large pipe diameter and can be used for measuring the medium which is not easy to contact and observe. The outer clamp type pipe cutting device is convenient to install, and pipe cutting is not needed. The user only needs to clamp the flow sensor on the surface of the pipeline, then the ultrasonic flowmeter can detect the flow through ultrasonic waves, and then the flow velocity value, the flow accumulator and the like are automatically calculated.
According to another aspect of the present invention, referring to fig. 4 of the accompanying drawings, the present invention further provides a flow-limiting check valve function test system for implementing the flow-limiting check valve function test method according to any one of the above embodiments, the flow-limiting check valve function test system comprising: the device comprises a main pipeline, a plurality of branch pipelines 5, a plurality of water pumps 6, a plurality of branch valves 7, a plurality of flow limiting check valves 8 and a flow detection device. The main pipeline comprises a main pipeline water inlet pipe 1 and a main pipeline water outlet pipe 2, the main pipeline water inlet pipe 1 is provided with an inlet pressure detection device 3, and the main pipeline water outlet pipe 2 is provided with an outlet pressure detection device 4. The branch pipelines 5 are arranged between the main pipeline water inlet pipe 1 and the main pipeline water outlet pipe 2 in parallel, the water pumps 6 are respectively arranged on each branch pipeline 5, the branch valves 7 are respectively arranged at the water inlet ends of each branch pipeline 5, and the flow limiting check valves 8 are respectively arranged at the water outlet ends of each branch pipeline 5. The flow detection device is arranged on the main pipeline and used for acquiring the total water flow Q of the main pipeline to be detected 0 。
Specifically, the flow detection device is an ultrasonic flowmeter; and/or the inlet pressure detection means 3 is a pressure gauge; and/or the outlet pressure detection means 4 is a pressure gauge. The inlet pressure detecting device 3 and the outlet pressure detecting device 4 may be pressure gauges of the detected pipeline, as long as the devices can obtain the pressure of the main pipeline.
Further, the flow restricting check valve function test system further includes: and the drawing device is used for drawing a pipeline performance curve graph. The drawing device may be a manual drawing device such as a drawing book, a notebook, a pen, or the like. The drawing device may be an automatic drawing device, such as a drawing program, APP, etc. provided on an electronic device or an intelligent terminal, as long as the device for drawing a pipeline performance graph can be realized.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and the parts of a certain embodiment that are not described or depicted in detail may be referred to in the related descriptions of other embodiments.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (8)
1. A method for testing the function of a flow limiting check valve, comprising the steps of:
starting each parallel water pump on the main pipeline to be tested, and obtaining the total water flow Q of the main pipeline to be tested after the water pump runs stably 0 Main pipe inlet pressure P in And main pipe outlet pressure P out To obtain the total lift H 0 =（P out -P in ) ρg, where ρ is the water density and g is the free fall acceleration;
starting the water pump to be tested, closing other water pumps connected in parallel, and obtaining the water flow Q of the branch where the water pump to be tested is located after the water pump to be tested runs stably 1 Branch inlet pressure P 1in And branch outlet pressure P 1out Obtaining the tested water pump lift H 1 =（P 1out -P 1in ）/ρg；
Comparative H 1 And H 0 If H 1 =H 0 If H, the flow limiting check valve of the detected branch is normal in flow limiting function 1 <H 0 The flow limiting check valve of the tested branch is abnormal in flow limiting function;
wherein, the pipeline performance curve H=SQ is drawn 2 Wherein, the flow Q is taken as an abscissa, the lift H is taken as an ordinate, and the running state point (Q 1 ，H 1 ) Comparison of H 1 And H 0 If H 1 =H 0 If H, the flow limiting check valve of the detected branch is normal in flow limiting function 1 <H 0 The flow limiting check valve of the tested branch is abnormal in flow limiting function;
point of passing (Q) 1 ，H 1 ) The intersection point of the vertical line of the ordinate axis and the line performance curve is denoted as (Q) 1 ’，H 1 ) Comparative Q 1 And Q 1 ' if Q 1 =Q 1 ' the flow-limiting check valve of the branch to be tested has no regulation function, if Q 1 <Q 1 ' the restriction check valve of the branch under test plays a part in the regulation.
2. The flow limiting check valve function test method according to claim 1, wherein the passing point (Q 1 ，H 1 ) The intersection point of the vertical line of the ordinate axis and the line performance curve is denoted as (Q) 1 ’，H 1 ) Comparative Q 1 And Q 1 ' if Q 1 =Q 1 ' the flow-limiting check valve of the branch to be tested has no regulation function, if Q 1 <Q 1 ' after the flow limiting check valve of the tested branch has a part of adjusting function, the method further comprises the steps of:
closing the water pump to be tested, starting the other water pump to be tested, and obtaining the water flow Q of the branch where the other water pump to be tested is positioned after the other water pump to be tested runs stably 2 Inlet pressure P of the other branch 2in And another branch outlet pressure P 2out Obtaining the lift H of another tested water pump 2 =（P 2out -P 2in ）/ρg；
Comparative H 2 And H 0 If H 2 =H 0 If H, the flow-limiting check valve of the other branch to be tested has normal flow-limiting function 2 <H 0 The flow limiting check valve of the other branch to be tested has abnormal flow limiting function;
and circulating in this way until the detection of all the water pumps connected in parallel is completed.
3. According to claim2, wherein the comparison H is characterized by 2 And H 0 If H 2 =H 0 If H, the flow-limiting check valve of the other branch to be tested has normal flow-limiting function 2 <H 0 The flow limiting check valve of the other detected branch circuit has abnormal flow limiting function, and the method specifically comprises the following steps:
on the same graph, another measured water pump running state point (Q 2 ，H 2 ) Comparison of H 2 And H 0 If H 2 =H 0 If H, the flow-limiting check valve of the other branch to be tested has normal flow-limiting function 2 <H 0 The flow limiting check valve of the other branch to be tested has abnormal flow limiting function;
point of passing (Q) 2 ，H 2 ) The intersection point of the vertical line of the ordinate axis and the line performance curve is denoted as (Q) 2 ’，H 2 ) Comparative Q 2 And Q 2 ' if Q 2 =Q 2 ' the flow-limiting check valve of the other branch to be tested has no regulation action, if Q 2 <Q 2 ' the restriction check valve of the other branch under test plays a part in the regulation.
4. The method for testing the function of the flow-limiting check valve according to any one of claims 1 to 3, wherein each parallel water pump on the main pipeline to be tested is started, and after the water pump is stable in operation, the total water flow Q of the main pipeline to be tested is obtained 0 Main pipe inlet pressure P in And main pipe outlet pressure P out To obtain the total lift H 0 =（P out -P in ) And (p) g, wherein p is the water density, and g is the free falling acceleration, and the method further comprises the following steps:
a flow detection device is arranged on the main pipeline to be detected and is used for acquiring the total water flow Q of the main pipeline to be detected 0 ；
An inlet pressure detection device is arranged at the inlet end of the main pipeline to be detected and is used for acquiring the inlet pressure P of the main pipe in ；
In the outlet of the main pipeline to be testedThe port end is provided with an outlet pressure detection device which is used for acquiring the outlet pressure P of the main pipe in 。
5. The method for testing the function of a flow restricting check valve of claim 4,
the flow detection device is an ultrasonic flowmeter;
and/or the inlet pressure detection device is a pressure gauge;
and/or, the outlet pressure detection device is a pressure gauge.
6. A flow restricting check valve function test system for implementing the flow restricting check valve function test method of any one of claims 1-5, comprising:
the main pipeline comprises a main pipeline water inlet pipe and a main pipeline water outlet pipe, the main pipeline water inlet pipe is provided with an inlet pressure detection device, and the main pipeline water outlet pipe is provided with an outlet pressure detection device;
a plurality of branch pipelines which are arranged in parallel between the main pipeline water inlet pipe and the main pipeline water outlet pipe,
the water pumps are respectively arranged on each branch pipeline;
the branch valves are respectively arranged at the water inlet end of each branch pipeline;
the plurality of flow limiting check valves are respectively arranged at the water outlet end of each branch pipeline;
the flow detection device is arranged on the main pipeline and used for acquiring the total water flow Q of the main pipeline to be detected 0 。
7. The method for testing the function of a flow restricting check valve of claim 6,
the flow detection device is an ultrasonic flowmeter;
and/or the inlet pressure detection device is a pressure gauge;
and/or, the outlet pressure detection device is a pressure gauge.
8. The flow restricting check valve function test method of claim 6, further comprising:
and the drawing device is used for drawing a pipeline performance curve graph.
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| JP2010127079A (en) * | 2008-11-25 | 2010-06-10 | Sayama Seisakusho:Kk | Head loss estimating device and method of backflow preventive check valve |
| CN101696684B (en) * | 2009-10-15 | 2011-08-31 | 杭州源流科技有限公司 | Self-circulation table-type pump performance experiment system |
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