A balanced proportion mixer mixing ratio test system and test method

Abstract

The embodiment of the present application provides a balanced proportion mixer mixing ratio test system and a test method, the balanced proportion mixer mixing ratio test system comprises a foam liquid pipeline and a water flow pipeline, the foam loop is selectively connected to the water flow pipeline; and a test branch, comprising a foam liquid branch, a water flow branch and a back pressure balance valve, the foam liquid branch is led out from the foam liquid pipeline, the water flow branch is led out from one side of the water flow pipeline, the foam liquid branch and the water flow branch are connected through the back pressure balance valve, and the back pressure balance valve is adjusted to keep the pressure balance of the foam liquid branch and the water flow branch, so that the mixing ratio test is carried out.

Description

Technical Field

[0001] This application relates to the field of fire equipment testing, and in particular to a balanced proportioning mixer mixing ratio testing system and testing method. Background Technology

[0002] Foam fire extinguishing systems are essential fire protection facilities in petrochemical plants, airports, docks, underground parking garages, and other similar locations. The proportioning mixer is a core component of these systems, used to mix foam concentrate and water in a specific ratio to form the foam mixture. Balanced proportioning mixers are widely used in large-scale foam fire extinguishing systems due to their high mixing accuracy and wide flow range adaptability.

[0003] According to the national standard GB50151-2021 "Technical Standard for Foam Fire Extinguishing Systems," the mixing ratio of the proportioning mixer in a foam fire extinguishing system should be tested regularly to ensure system effectiveness. However, testing the mixing ratio presents unique technical challenges for balanced proportioning mixers: because balanced proportioning mixers rely on precise inlet and outlet pressure balance for accurate mixing, any test method that disrupts this pressure balance will lead to distorted test results. Existing mixing ratio testing methods mainly involve sampling and analyzing the actual mixture of foam liquid and water, which generates a large amount of difficult-to-dispose-of foam mixture waste. Summary of the Invention

[0004] One advantage of this invention is that it provides a mixing ratio testing system and method for a balanced proportioning mixer, which solves the technical problem in the prior art that the testing of a balanced proportioning mixer requires actual mixing to generate waste liquid or disrupts the pressure balance, leading to test distortion.

[0005] Another advantage of the present invention is that it provides a balanced proportioning mixer mixing ratio testing system and testing method. By setting up test branches, the foam liquid and water circulate in their respective loops during the test, without actual mixing, and without generating foam mixture waste liquid.

[0006] Another advantage of this invention is that it provides a balanced proportioner mixing ratio testing system and method, in which a back pressure balancing valve is set on the test branch to adjust the pressure on the foam liquid side and the water side to maintain balance, ensuring that the test results truly reflect the actual performance of the proportioner.

[0007] Another advantage of the present invention is that it provides a balanced proportioning mixer mixing ratio testing system and testing method, which sets up a double pressure tube on the test branch to introduce the pressure on the foam liquid side and the water side respectively, so as to reflect the actual working conditions and ensure the accuracy of the test results.

[0008] Another advantage of this invention is that it provides a balanced proportioning mixer mixing ratio testing system and method, which only requires setting up test branches on the existing system without large-scale modification. The system is simple and easy to maintain.

[0009] Another advantage of this invention is that it provides a balanced proportioning mixer mixing ratio testing system and method, which utilizes existing water sources and foam liquid storage tanks to form a closed loop circulation, eliminating the need to lay return pipes from the test point to the fire water tank, thus significantly reducing engineering modification costs.

[0010] Another advantage of this invention is that it provides a balanced proportioning mixer mixing ratio testing system and method that does not affect system standby status. During testing, only the ball valve status needs to be switched, while the main fire protection system remains available, meeting the stringent system availability requirements of GB50151-2021.

[0011] According to one aspect of the present invention, a balanced proportioning mixer mixing ratio testing system is provided, comprising: Foam liquid piping and water piping, wherein the foam circuit is selectively connected to the water piping; and, The test branch includes a foam liquid branch, a water flow branch, and a back pressure balancing valve. The foam liquid branch is led out from the foam liquid pipeline, and the water flow branch is led out from one side of the water flow pipeline. The foam liquid branch and the water flow branch are connected through the back pressure balancing valve. The back pressure balancing valve is adjusted to maintain pressure balance between the foam liquid branch and the water flow branch for mixing ratio testing.

[0012] According to an example of the present invention, a diaphragm is provided in the valve chamber of the back pressure balancing valve, the diaphragm dividing the valve chamber into an upper diaphragm chamber and a lower diaphragm chamber. The back pressure balancing valve further includes a first pressure-inlet pipe and a second pressure-inlet pipe. The first pressure-inlet pipe is connected to the water flow branch and the upper diaphragm chamber to introduce water-side pressure, and the second pressure-inlet pipe is connected to the foam liquid branch and the lower diaphragm chamber to introduce foam pressure.

[0013] According to one example of the present invention, the back pressure balancing valve further includes a valve core and a spring component, the valve core and the spring component being fixed and connected to the diaphragm. Under the action of the pressure difference between the upper diaphragm chamber and the lower diaphragm chamber, the diaphragm drives the valve core to move, thereby controlling the valve opening of the back pressure balancing valve and adjusting the flow rate of the foam liquid until the pressures of the upper diaphragm chamber and the lower diaphragm chamber are balanced.

[0014] According to one example of the present invention, it further includes: A first flow meter, installed on the foam liquid branch and located downstream of the back pressure balancing valve, is used to measure the flow rate of the foam liquid; and, The second flow meter is installed on the water flow branch and is used to measure the water flow rate.

[0015] According to one example of the present invention, the test branch further includes a second ball valve disposed on the first pressure tapping pipe to control the connection between the water flow branch and the back pressure balancing valve.

[0016] According to one example of the present invention, the foam liquid pipeline includes a foam liquid injection pipe and a first ball valve, the first ball valve being disposed on the foam liquid injection pipe to control whether the foam liquid injection pipe injects foam liquid into the water flow pipeline.

[0017] According to one example of the present invention, the first ball valve and the third ball valve are configured to be interlocked: when the first ball valve is open, the third ball valve is closed, allowing the foam liquid to flow through the foam liquid injection pipe to the mixing chamber; when the first ball valve is closed, the third ball valve is open, allowing the foam liquid to flow back through the foam liquid branch and the back pressure balance valve.

[0018] According to one example of the present invention, the test branch further includes a third ball valve, which is located downstream of the back pressure balancing valve and is used to control whether the foam liquid flows back to the foam liquid storage container.

[0019] According to one example of the present invention, it further includes a flow regulating branch, a linkage assembly, and a foam liquid delivery valve. One end of the flow regulating branch is connected to the output end of the foam liquid delivery valve, and the other end is connected to the water flow pipeline. The linkage assembly includes an adjusting end, an extension body, and a baffle. The adjusting end is installed at the output end of the foam liquid delivery valve. The extension body extends from the adjusting end along the flow regulating branch into the interior of the water flow pipeline. The baffle is movably installed at one end of the extension body and is located in the water flow pipeline. The baffle adjusts its opening degree according to the water pressure, controlling the flow area of ​​the water flow, thereby driving the extension body and the adjusting end to control the flow area of ​​the output end of the foam liquid delivery valve.

[0020] According to another aspect of the present invention, the present invention provides a method for testing the mixing ratio of the balanced proportioning mixer mixing ratio testing system, comprising the following steps: Close the first ball valve and open the second ball valve to allow the foam liquid and water flow to enter the back pressure balance valve respectively. Water-side pressure is introduced into the upper membrane chamber of the back pressure balancing valve through a first pressure-introducing pipe, and foam liquid-side pressure is introduced into the lower membrane chamber of the back pressure balancing valve through a second pressure-introducing pipe. The back pressure balancing valve automatically adjusts to balance the foam liquid-side pressure and the water-side pressure. The flow rates of the foam liquid and water are obtained using the first and second flow meters, respectively, and the mixing ratio is calculated. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this application and are not intended to limit this application.

[0022] Figure 1 This is a schematic diagram of the structure of a balanced proportioning mixer mixing ratio testing system according to a preferred embodiment of the present invention.

[0023] Figure 2 This is a cross-sectional schematic diagram of a balanced proportioning mixer mixing ratio testing system according to a preferred embodiment of the present invention.

[0024] Figure 3 This is a cross-sectional view of the back pressure balancing valve of a balanced proportioner mixing ratio testing system according to a preferred embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the structure of a balanced proportioning mixer mixing ratio testing system according to another preferred embodiment of the present invention.

[0026] Figure 5 This is a cross-sectional schematic diagram of a balanced proportioning mixer mixing ratio testing system according to another preferred embodiment of the present invention.

[0027] Figure 6 This is a schematic diagram of the structure of a balanced proportioning mixer mixing ratio testing system according to another preferred embodiment of the present invention.

[0028] Figure label: 10: Foam liquid pipeline; 11: Foam liquid injection pipe; 12: First ball valve; 13: Flow regulating branch; 14: Foam liquid delivery valve; 15: Linkage assembly; 151: Adjusting end; 152: Extension body; 153: Baffle; 154: Elastic element; 20: Water flow pipeline; 21: Mixing chamber; 30: Test branch; 31: Foam liquid branch; 32: Water flow branch; 33: Back pressure balancing valve; 34: First pressure tap; 35: Second pressure tap; 36: Second ball valve; 37: Third ball valve; 331: Valve body; 332: Valve seat; 333: Valve core; 334: Diaphragm; 3341: Upper diaphragm chamber; 3342: Lower diaphragm chamber; 335: Spring assembly. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0030] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this application, it should be understood that the terms "center", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] In this application, the term "implementation" means that a specific feature, structure, or characteristic described in connection with an implementation can be included in at least one implementation of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same implementation, nor is it a separate or alternative implementation mutually exclusive with other implementations. Those skilled in the art will understand, explicitly and implicitly, that the implementations described in this application can be combined with other implementations.

[0034] As mentioned above, it should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, components, or groups of features, integers, steps, or components. As used in this application, the singular forms "a," "an," and "the" also include the plural forms, unless the context clearly indicates otherwise.

[0035] The terms “a” and “an” used in this specification may mean one, but may also be used interchangeably with “at least one” or “one or more”. The term “about” generally means the mentioned value plus or minus 10%, or more specifically, plus or minus 5%. The term “or” used in the claims means “and / or” unless it is explicitly stated that it refers only to alternatives.

[0036] Reference manual attached Figures 1 to 4 This application provides a balanced proportioning mixer mixing ratio testing system, which includes a foam liquid pipeline 10 and a water flow pipeline 20. The foam liquid pipeline 10 is connected to a foam liquid storage container for storing fire extinguishing foam liquid. The foam liquid pipeline 10 controls the flow of foam liquid into the water flow pipeline 20, which is connected to a water storage container, such as an external water supply pipeline. When the balanced proportioning mixer is working, the water flow pipeline 20 is used to deliver the mixture produced by mixing water and foam liquid in an external pipeline into the fire extinguishing pipeline. Both the water flow pipeline 20 and the foam liquid pipeline 10 are equipped with valves and flow meters to control the outflow of liquid, enabling self-circulation and flow monitoring of the liquid in the loop within the water flow pipeline 10 and the foam liquid pipeline 20.

[0037] The foam liquid pipeline 10 includes a foam liquid injection pipe 11, the end of which is connected to the water flow pipeline 20 for injecting foam liquid into the water flow pipeline 20 to mix with the water flow.

[0038] The foam liquid injection pipe 11 is equipped with a first ball valve 12. The inner diameter of the first ball valve 12 can be the same as the inner diameter of the foam liquid injection pipe 11 to ensure that no additional flow resistance is generated during normal use. When the first ball valve 12 is opened, the foam liquid in the foam injection pipe 11 is injected into the water flow pipe 20, realizing the mixing of foam liquid and water flow.

[0039] The water flow pipeline 20 includes a mixing chamber 21 located on the water flow pipeline 20. One end of the foam liquid injection pipe 11 is connected to the mixing chamber 21 to inject foam liquid, where the water flow in the mixing chamber 21 mixes with the water flow in the water flow pipeline 20. A water flow branch 32 is located on one side of the mixing chamber 21, through which water flows into the water flow branch 32.

[0040] The balanced proportioning mixer mixing ratio testing system also includes a test branch 30, which is separately configured and connected to the water flow pipeline 20 and the foam liquid pipeline 10. This branch is used to conduct mixing ratio tests without mixing the water flow and the foam liquid. Thus, no major modifications to the original system are required, reducing modification and maintenance costs. It also ensures the normal operation of the original system in both standby and working states, and avoids generating waste liquid solely for testing, achieving zero waste liquid discharge.

[0041] The test branch 30 includes a foam liquid branch 31 and a water flow branch 32. The foam liquid branch 31 extends from the foam liquid injection pipe 11, and the water flow branch 32 extends from the water flow pipe 20. One end of the foam liquid branch 31 is connected to the foam liquid injection pipe 11, and the other end is connected to a foam liquid storage container, allowing the foam liquid to flow back to the foam liquid storage container. One end of the water flow branch 32 is connected to the water flow pipe 20, and the other end is connected to a water storage container, allowing water to flow back to the water storage container. This enables the return of foam liquid and water, forming a self-circulating system using the existing foam liquid storage pipe and water storage container.

[0042] A check valve may be installed between the foam liquid branch 31 and the foam liquid injection pipe 11 to provide a backflow prevention function and prevent foam liquid from flowing back. The check valve can prevent foam liquid from flowing back from the branch to the injection pipe during testing, thus avoiding contamination of the original system.

[0043] The water flow branch 32 and the foam liquid branch 31 are connected for proportion testing. A back pressure balancing valve 33 is installed at the connection between the water flow branch 32 and the foam liquid branch 31 to isolate the water flow and the foam liquid, so as to test the ratio of water flow and foam liquid without mixing the foam liquid and water flow.

[0044] The test branch 30 further includes a first pressure tap 34, a second pressure tap 35, and a second ball valve 36. One end of the first pressure tap 34 is connected to the water flow branch 32, and the other end is connected to the back pressure balancing valve 33. One end of the second pressure tap 35 is connected to the back pressure balancing valve 33, and the other end is connected to the foam liquid branch 31. The second ball valve 36 is installed on the first pressure tap 34 and is used to control the connection between the test branch 30 and the water flow pipeline 20.

[0045] The test branch 30 also includes a third ball valve 37, which is disposed on the foam liquid branch 31 and is used to control whether the foam liquid on the foam liquid branch 31 flows back to the foam liquid storage container.

[0046] The first pressure-inlet pipe 34 introduces the pressure from the water flow pipe 20 into the back pressure balancing valve 33, and the second pressure-inlet pipe 35 introduces the pressure from the foam liquid injection pipe 11 into the back pressure balancing valve 33. Under normal operating conditions, when the foam liquid from the foam liquid pipe 10 is injected into the water flow in the water flow pipe 20, the pressure of the foam liquid is equal to the back pressure of the water. Therefore, when the foam pressure and the water pressure introduced by the back pressure balancing valve 33 are balanced, the actual operating conditions can be reflected. The back pressure balancing valve 33 of this application, through a dual pressure-inlet pipe design, introduces the pressure from the foam liquid side and the water side respectively to reflect the actual operating conditions, so that the test results can accurately reflect the actual mixing ratio.

[0047] The back pressure balancing valve 33 is a self-operated pressure regulating valve, comprising a valve body 331, a valve seat 332, a valve core 333, a diaphragm 334, and a spring component 335. The valve core 333, the diaphragm 334, and the spring component 335 are disposed within the valve body 331. The valve body 331 and the foam liquid branch 31 are fixed. The valve seat 332 forms the base of the valve body 331, sealing the inner cavity of the valve body 331. The valve core 333 controls the flow area of ​​the foam liquid branch 31. The diaphragm 334 is connected to the valve core 333 and is located within the valve cavity of the back pressure balancing valve 33, forming upper and lower diaphragm chambers. The diaphragm 334 is displaced according to the pressure difference between the upper and lower diaphragm chambers, causing the valve core 333 connected to it to move, thereby adjusting the valve opening of the back pressure balancing valve 33.

[0048] The two sides of the diaphragm 334 are water flow and foam liquid respectively. When the pressure on the foam liquid side is greater than the pressure on the water flow side, the pressure on the foam liquid side overcomes the spring force of the spring component 335 and pushes the valve core 333 to open. The foam liquid flow area of ​​the back pressure balance valve 33 increases. After the flow area increases, the pressure of the foam liquid decreases. The pressure of the foam liquid and the pressure of the water flow are consistent and reach a balance state.

[0049] Specifically, an upper membrane chamber 3341 and a lower membrane chamber 3342 are formed on both sides of the diaphragm 334. The upper membrane chamber 3341 is connected to the water flow branch 32 through the first pressure-sensing pipe 34 and receives the water-side pressure as the target set value. The lower membrane chamber 3342 is connected to the foam liquid branch 31 through the second pressure-sensing pipe 35 and receives the foam liquid-side pressure as the actual measured value.

[0050] When the pressure on the foam liquid side is higher than the pressure on the water side, the unbalanced force on the diaphragm 334 pushes the valve core 333 to open, moving it towards the upper membrane chamber 3341, increasing the foam liquid return flow and causing the foam liquid side pressure to decrease. When the foam liquid side pressure is lower than the water side pressure, the spring force pushes the valve core 333 towards the lower membrane chamber 3342, reducing the foam liquid return flow and causing the foam liquid side pressure to rise again. Through this automatic feedback adjustment, the back pressure balancing valve 33 always maintains the foam liquid side pressure equal to the water side pressure, thus achieving pressure balance. In this way, by simulating actual working conditions through the back pressure balancing valve 33, the test results can accurately reflect the actual mixing ratio.

[0051] refer to Figures 4 to 6 Another example of this application is shown, which differs from the previous example in that the mixing chamber 21 of the water flow pipeline 20 is larger in size, providing a larger mixing space and generating a larger flow rate of mixed foam liquid, making it suitable for applications with large flow rates and large pipe diameters.

[0052] The foam liquid pipeline 10 includes a flow regulating branch 13, which is added to one side of the foam liquid injection pipe 11 to regulate the flow area of ​​the water flow to be consistent with the flow area of ​​the foam liquid.

[0053] The foam liquid pipeline 10 includes a foam liquid delivery valve 14. One end of the foam liquid injection pipe 11 is connected to the output pipe of the foam liquid delivery valve 14, and the input end of the foam liquid delivery valve 14 is connected to the foam liquid storage container. The other end of the foam liquid injection pipe 11 is connected to the water flow pipeline 20. One end of the flow regulating branch 13 is connected to the foam liquid injection pipe 11 to communicate with the output end of the foam liquid delivery valve 14, and the other end of the flow regulating branch 13 is connected to the water flow pipeline 20.

[0054] A connecting rod assembly 15 is provided in the flow regulating branch 13. One end of the connecting rod assembly 15 is located at the output end of the foam liquid delivery valve 14, and the other end of the connecting rod assembly 15 is located in the water flow pipeline 201.

[0055] The linkage assembly 15 includes an adjusting end 151, an extension body 152, and a baffle 153. The adjusting end 151 is installed at the output end of the foam liquid delivery valve 14 and is used to adjust the flow area of ​​the foam liquid delivery valve 14. The extension body 152 connects the adjusting end 151 and the baffle 153, extending from the output end of the foam liquid delivery valve 14 along the flow regulation branch 13 into the water flow pipeline 20. The baffle 153 is movably installed at one end of the extension body 152, controlling the flow area of ​​water entering the mixing chamber 21. Under pressure, the baffle 153 opens and / or closes, further controlling the flow area of ​​water according to the degree of opening of the baffle 153. That is, one end of the linkage assembly 15 controls the flow area of ​​water according to the water pressure, and through the linkage action of the linkage, controls the flow area of ​​foam liquid at the other end.

[0056] The baffle 153 is located in the water flow pipe 20. When the water flows to the baffle 153, it exerts pressure on the baffle 153. When the water flow rate is small, the pressure exerted on the baffle 153 is small, the opening degree of the baffle 153 is small, and the flow area is small; when the water flow rate is large, the pressure exerted on the baffle 153 is large, the opening degree of the baffle 153 is large, and the flow area is large.

[0057] When the baffle 153 changes from a closed state to an open state under the pressure of the water flow, the rotation of the baffle 153 pulls the extension body 152 and the adjustment end 151, causing the adjustment end 151 to move down, expanding the flow area of ​​the output end of the foam liquid delivery valve 14, so as to match the flow area of ​​the water flow with the flow area of ​​the foam liquid.

[0058] The flow regulation branch 13 includes a first portion 131 and a second portion 132. The first portion 131 extends from the side of the foam liquid injection pipe 11 and communicates internally with the foam liquid injection pipe 11. The second portion 132 extends from the side of the first portion 131 to the surface of the water flow pipe 20, and the portion of the extension body 152 located within the second portion 132 abuts against the inner surface of the second portion 132. That is, the interior of the second portion 132 is filled by the extension body 152.

[0059] The outer surface of the portion of the extension body 152 located within the second part 132 is provided with an elastic element 154 for elastic reset. The end of the elastic element 154 can be supported on the outer surface of the water pipe 20.

[0060] When the pressure on the baffle 153 increases, the baffle 153 opens to a greater extent, the elastic element 154 is compressed, and the extension body 152 is pulled by the baffle 153, causing the adjusting end 151 to move downward and expanding the flow area at the output end of the foam liquid delivery valve 14. When the pressure on the baffle 153 decreases, the elastic element 154, through its elastic restoring force, drives the extension body 152 and the adjusting end 151 to return to their original positions.

[0061] Next, the working status of the balanced mixer proportioning test device of this application will be described.

[0062] When in standby or normal operation, the first ball valve 12 is open, while the second ball valve 36 and the third ball valve 37 are closed. At this time, the test branch 30 is closed, and foam concentrate is injected into the water flow pipeline 20 via the foam concentrate injection pipe 11 and the first ball valve 12, mixing with the water flow. The foam concentrate and water mix to form a foam mixture, which is then delivered to the foam generating device. At this point, the system is in normal fire standby or fire extinguishing operation mode.

[0063] In the mixing ratio test state, the first ball valve 12 is in the closed state, and the second ball valve 36 and the third ball valve 37 are in the open state. At this time, the test branch 30 is in the open state, and the foam liquid cannot enter the water flow pipeline 20 through the first ball valve 12, but enters the foam liquid branch 31. The water flow branch 32 is in the open state through the third ball valve 37. The water flow in the water flow pipeline 20 enters the upper membrane chamber 3341 of the back pressure balancing valve 33 through the water flow branch 32 and the first pressure tapping pipe 34. The foam liquid flows into the lower membrane chamber 3342 of the back pressure balancing valve 33. The pressure of the upper membrane chamber 3341 and the lower membrane chamber 3342 is adjusted to a balanced state. At this time, the foam liquid side pressure and the water side pressure are balanced.

[0064] At this point, a mixing ratio test is conducted. During the test, the foam liquid enters the back pressure balancing valve 33 via the foam liquid branch 31, and then flows back to the foam liquid storage container via the first flow meter installed on the foam liquid branch 31; simultaneously, the water flow in the water flow branch 32 flows back via the second flow meter installed on the water flow branch 32. Due to the automatic adjustment of the back pressure balancing valve 33, the pressure on the foam liquid side and the pressure on the water side remain equal. At this time, the pressure on the foam liquid side and the pressure on the water side are consistent with the actual operating conditions. The ratio of the foam liquid flow rate measured by the first flow meter to the water flow rate measured by the second flow meter truly reflects the mixing ratio of the balanced proportioning mixer.

[0065] This testing method eliminates the need for actual mixing of foam liquid and water, thus avoiding waste liquid generation; it also eliminates the need for additional return pipes, reducing modification costs; more importantly, through the dual pressure tap automatic tracking structure, it achieves dynamic pressure balance across the entire flow range, ensuring that the test conditions are consistent with the actual fire extinguishing conditions, thereby obtaining accurate and reliable mixing ratio measurement results.

[0066] This application also provides a method for testing the mixing ratio of a balanced proportioning mixer, including the following steps: S1: Close the first ball valve 12 and open the second ball valve 36 to allow the foam liquid and water to enter the back pressure balance valve 33; Specifically, the first ball valve 12 is closed to cut off the supply of foam liquid to the mixing chamber 21; the second ball valve 36 and the third ball valve 37 are opened to allow the foam liquid to flow to the foam liquid branch 31 and water to flow into the water branch 32.

[0067] S2: Introduce foam liquid side pressure and water side pressure through the first pressure inlet tube 34 and the second pressure inlet tube 35, and adjust them to balance the foam liquid side pressure and water side pressure; Specifically, water flows through the mixing chamber 21 into the water flow branch 32, and is introduced into the upper membrane chamber 3341 of the back pressure balancing valve 33 through the first pressure tap 34. Foam liquid flows into the foam liquid branch 31 and is introduced into the lower membrane chamber 3342 of the back pressure balancing valve 33 through the second pressure tap 35. The back pressure balancing valve 33 automatically adjusts the opening of the valve core 333, ensuring that the pressure in the lower membrane chamber 3342 tracks the pressure change in the upper membrane chamber 3341, and the two are equal. The reading of the first flow meter is observed to be stable, confirming that pressure balance has been established.

[0068] S3: Obtain the foam liquid flow rate and water flow rate through the first flow meter and the second flow meter, calculate the ratio, and obtain the mixing ratio.

[0069] Specifically, under pressure equilibrium, the readings of the first flow meter (i.e., the foam liquid flow rate) and the second flow meter (i.e., the water flow rate) are recorded respectively. Optionally, to improve measurement accuracy, measurements can be repeated multiple times under different flow conditions, and the average value is taken. The mixing ratio is calculated according to the formula: the mixing ratio equals the foam liquid flow rate divided by the sum of the water flow rate and the foam liquid flow rate, multiplied by 100%. This ratio is then compared with the design value to determine whether the proportional mixer's performance is up to standard.

[0070] Furthermore, before step S1 and after step S3, the steps may include: opening the first ball valve 12 and closing the second ball valve 36, so that the foam liquid in the foam liquid pipeline 10 is injected into the water flow pipeline 20 to generate a foam mixture.

[0071] Before step S1, it can be confirmed that the system is in normal standby state, the first ball valve 12 is open, the second ball valve 36 and the third ball valve 37 are closed, and the foam liquid participates in mixing normally.

[0072] After the test is completed, close the second ball valve 36 and the third ball valve 37, open the first ball valve 12, and restore the system to standby state.

[0073] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A mixing ratio testing system for a balanced proportioning mixer, characterized in that, include: Foam liquid pipeline and water flow pipeline, wherein the foam circuit can be selectively connected to the water flow pipeline; as well as, The test branch includes a foam liquid branch, a water flow branch, and a back pressure balancing valve. The foam liquid branch is led out from the foam liquid pipeline, and the water flow branch is led out from one side of the water flow pipeline. The foam liquid branch and the water flow branch are connected through the back pressure balancing valve. The back pressure balancing valve is adjusted to maintain pressure balance between the foam liquid branch and the water flow branch for mixing ratio testing.

2. The balanced proportioner mixing ratio testing system according to claim 1, characterized in that, The back pressure balancing valve has a diaphragm in its valve chamber, which divides the valve chamber into an upper diaphragm chamber and a lower diaphragm chamber. The back pressure balancing valve also includes a first pressure inlet pipe and a second pressure inlet pipe. The first pressure inlet pipe is connected to the water flow branch and the upper diaphragm chamber to introduce water-side pressure, and the second pressure inlet pipe is connected to the foam liquid branch and the lower diaphragm chamber to introduce foam pressure.

3. The balanced proportioner mixing ratio testing system according to claim 2, characterized in that, The back pressure balancing valve also includes a valve core and a spring component. The valve core and the spring component are fixed and connected to the diaphragm. Under the pressure difference between the upper and lower diaphragm chambers, the diaphragm drives the valve core to move, thereby controlling the valve opening of the back pressure balancing valve and adjusting the flow rate of the foam liquid until the pressure in the upper and lower diaphragm chambers is balanced.

4. The balanced proportioner mixing ratio testing system according to claim 3, characterized in that, Also includes: The first flow meter is installed on the foam liquid branch, downstream of the back pressure balancing valve, and is used to measure the flow rate of the foam liquid; and, The second flow meter is installed on the water flow branch and is used to measure the water flow rate.

5. The balanced proportioner mixing ratio testing system according to claim 2, characterized in that, The test branch also includes a second ball valve, which is installed on the first pressure tapping pipe to control the connection between the water flow branch and the back pressure balancing valve.

6. The balanced proportioner mixing ratio testing system according to claim 5, characterized in that, The foam liquid pipeline includes a foam liquid injection pipe and a first ball valve. The first ball valve is installed on the foam liquid injection pipe to control whether the foam liquid injection pipe injects foam liquid into the water flow pipeline.

7. The balanced proportioner mixing ratio testing system according to claim 6, characterized in that, The first ball valve and the third ball valve are configured to be interlocked: when the first ball valve is open, the third ball valve is closed, allowing the foam liquid to flow into the mixing chamber through the foam liquid injection pipe; When the first ball valve is closed, the third ball valve opens, allowing the foam liquid to flow back through the foam liquid branch and the back pressure balance valve.

8. The balanced proportioner mixing ratio testing system according to claim 5, characterized in that, The test branch also includes a third ball valve, which is located downstream of the back pressure balancing valve and is used to control whether the foam liquid flows back to the foam liquid storage container.

9. The balanced proportioner mixing ratio testing system according to claim 1, characterized in that, It also includes a flow regulating branch, a linkage assembly, and a foam liquid delivery valve. One end of the flow regulating branch is connected to the output end of the foam liquid delivery valve, and the other end is connected to the water flow pipeline. The linkage assembly includes an adjusting end, an extension body, and a baffle. The adjusting end is installed at the output end of the foam liquid delivery valve. The extension body extends from the adjusting end along the flow regulating branch into the interior of the water flow pipeline. The baffle is movably installed at one end of the extension body and is located in the water flow pipeline. The baffle adjusts its opening degree according to the water pressure, controlling the flow area of ​​the water flow, thereby driving the extension body and the adjusting end to control the flow area of ​​the output end of the foam liquid delivery valve.

10. A method for testing the mixing ratio using the balanced proportioner mixing ratio testing system according to any one of claims 1-9, characterized in that, Includes the following steps: Close the first ball valve and open the second ball valve to allow the foam liquid and water flow to enter the back pressure balance valve respectively. Water-side pressure is introduced into the upper membrane chamber of the back pressure balancing valve through the first pressure inlet pipe, and foam liquid-side pressure is introduced into the lower membrane chamber of the back pressure balancing valve through the second pressure inlet pipe. The back pressure balancing valve automatically adjusts to balance the foam liquid-side pressure and the water-side pressure. as well as The flow rates of the foam liquid and water are obtained using the first and second flow meters, respectively, and the mixing ratio is calculated.

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