A proportioning mixer

Abstract

The present application discloses a proportioning mixer, comprising a housing; a first fluid channel, the first fluid channel being used for circulating water; a second fluid channel, the second fluid channel being used for circulating foam liquid; a connecting port, the connecting port being configured to connect the first fluid channel and the second fluid channel; and a regulating valve, the regulating valve being arranged in the second fluid channel, the regulating valve being configured to be adjustable based on the flow rate of water entering the first fluid channel, thereby changing the flow rate of foam entering the first fluid channel from the second fluid channel. The present application provides a regulating valve whose opening can be automatically adjusted, which is used to change the flow area of ​​the fluid flowing through the regulating valve when the range of the water flow rate is large, thereby affecting the flow rate of the foam liquid, so that the flow rate of the foam liquid is changed under the dual influence of the adsorption pressure and the opening of the regulating valve, and meets the mixing ratio requirement of the foam liquid and water.

Description

Technical Field

[0001] The present application relates to the field of fire fighting equipment, and in particular to a proportioning mixer. Background Art

[0002] A proportion mixer is a commonly used device in the field of fire fighting equipment, which is used to mix foam liquid and fire fighting water in a certain proportion range to obtain a mixed liquid for fire extinguishing.

[0003] The venturi tube proportioning mixer is a commonly used proportioning mixer. When the fire water flows through the reduced flow section in the proportioning mixer, a negative pressure (or a certain vacuum degree) that absorbs the foam liquid will be formed. This negative pressure can affect the flow rate of the foam liquid entering the proportioning mixer. Generally speaking, when the flow rate of fire water is within a certain range, the degree to which the fire water and foam liquid are affected by fluid turbulence and boundary conditions is within a certain range, and the negative pressure and the flow rate of fire water can be approximately linearly related, so that the flow rate of the foam liquid and the flow rate of fire water are in a certain proportional range. However, when the flow range of fire water is too large, the degree to which the fire water and foam liquid are affected by fluid turbulence and boundary conditions increases, and the negative pressure may not be completely linearly related to the flow rate of fire water, resulting in the flow rate of the foam liquid and the flow rate of fire water failing to meet the required proportional range. Summary of the invention

[0004] In order to solve the above problems, at least one purpose of the first aspect of the present application is to provide a proportioning mixer, which can be suitable for mixing fire water and foam liquid in a large flow range, and the proportioning mixer includes: a shell; a first fluid channel, the first fluid channel is formed in the shell and is used to circulate water, the first fluid channel includes: a contraction section, a throat and a diffusion section, the throat is arranged between the contraction section and the diffusion section; a second fluid channel, the second fluid channel is formed in the shell and is used to circulate foam liquid; a connecting port, the connecting port is arranged on the shell at the throat of the first fluid channel, and is arranged to connect the first fluid channel and the second fluid channel so that the foam circulating in the second fluid channel can enter the first fluid channel; a regulating valve, the regulating valve is arranged in the second fluid channel, and the regulating valve is configured to be adjustable based on the flow rate of water entering the first fluid channel, thereby changing the flow rate of foam entering the first fluid channel from the second fluid channel.

[0005] According to the first aspect above, the regulating valve includes: an orifice plate, which is connected in the second fluid channel, and at least two through holes are provided on the orifice plate, and the inlet of the second fluid channel is connected to the connecting port fluid through the at least two through holes; and a blocking member, which is configured to be able to move relative to the orifice plate as the pressure at the connecting port changes, so as to open or close at least a part of the at least two through holes, thereby changing the flow rate of foam in the second fluid channel; wherein the pressure at the connecting port reflects the flow rate of water entering the first fluid channel.

[0006] According to the above first aspect, the orifice plate is vertically connected in the second fluid channel.

[0007] According to the above first aspect, the regulating valve also includes: a floating assembly, which is movably connected to the orifice plate; the blocking member is arranged on the floating assembly and moves with the movement of the floating assembly; wherein the floating assembly can move relative to the orifice plate along the second fluid channel based on the pressure at the connecting port, thereby driving the blocking member to move into or out of the at least two through holes.

[0008] According to the first aspect above, the floating assembly includes: an upper support plate, which is arranged on one side of the orifice plate; a lower support plate, which is arranged on the other side of the orifice plate; a connecting rod, which passes through the orifice plate to connect the upper support plate and the lower support plate so that the upper support plate moves together with the lower support plate, wherein the connecting rod is perpendicular to the upper support plate and the lower support plate; and wherein the pressure at the inlet of the second fluid channel is reflected on the upper support plate, and the pressure at the connecting port is reflected on the lower support plate.

[0009] According to the first aspect above, the regulating valve also includes: an elastic component, one end of which is fixed relative to the orifice plate, and the other end is supported to the upper support plate or the lower support plate, and the elastic component can apply elastic force to the upper support plate or the lower support plate.

[0010] According to the above first aspect, the blocking member includes at least one push rod, each of the at least one push rod extends from the surface of the upper support plate and / or the lower support plate and is aligned with one of the at least two through holes.

[0011] According to the above first aspect, the at least one push rod includes at least two push rods, and the at least two push rods have different lengths.

[0012] According to the first aspect above, the elastic component includes a spring, which is arranged between the orifice plate and the upper support plate or the lower support plate, wherein the top end of the spring is connected to the orifice plate and the bottom end of the spring abuts against the upper support plate or the lower support plate.

[0013] According to the above first aspect, the at least two through holes include at least two circles of through holes, and the blocking member is configured to be able to open or close the through holes of the inner circle of the at least two circles of through holes.

[0014] The present application provides a regulating valve with automatically adjustable opening, which is used to change the flow area of ​​the fluid flowing through the regulating valve 120 when the water flow rate range is large, thereby affecting the foam liquid flow rate, so that the foam liquid flow rate is changed under the dual influence of the pressure at the connecting port and the opening of the regulating valve, thereby meeting the mixing ratio requirement of the foam liquid and water. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A A three-dimensional structural diagram of an embodiment of the proportional mixer of the present application;

[0016] Figure 1B for Figure 1A An axial cross-sectional view of the proportioning mixer is shown;

[0017] Figure 2A for Figure 1B A three-dimensional cross-sectional view of the portion outside the dotted line frame;

[0018] Figure 2B for Figure 1B A partial enlarged view of the dotted line frame;

[0019] Figure 3 for Figure 2B The three-dimensional structure diagram of the floating assembly and the orifice plate;

[0020] Figure 4 for Figure 3 A top view of the orifice plate in FIG.

[0021] Figures 5A-5C for Figure 2B A cross-sectional view of an embodiment of a regulating valve in the figure, for illustrating an automatic regulating process of the regulating valve;

[0022] Figure 6 for Figure 2B A cross-sectional view of another embodiment of the regulating valve;

[0023] Figure 7 for Figure 2B A cross-sectional view of yet another embodiment of a regulating valve in FIG. DETAILED DESCRIPTION

[0024] Various specific embodiments of the present invention will be described below with reference to the accompanying drawings that form a part of this specification. It should be understood that although terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "top", "bottom", "inside", "outside", etc., are used in this application to describe various example structural parts and elements of the present application, these terms are used here only for the purpose of convenience of description and are determined based on the example orientations shown in the accompanying drawings. Since the embodiments disclosed in the present application can be set in different directions, these terms indicating directions are only used as illustrations and should not be regarded as limitations. Where possible, the same or similar figure numbers used in this application refer to the same parts.

[0025] Figure 1A A perspective view of a proportioning mixer 100 of the present application is shown. Figure 1B Shows Figure 1A An axial cross-sectional view of a proportioner 100 is shown.

[0026] like Figure 1A As shown, the proportioning mixer 100 includes a hollow housing 150, which includes a cylindrical section 151 and a trumpet-shaped section 152 connected to each other, and a branch section 153 extending from the cylindrical section 151. The end of the trumpet-shaped section 152 with a smaller diameter is connected to a bottom surface of the cylindrical section 151, and the branch section 153 extends from the side of the cylindrical section 151.

[0027] like Figure 1BAs shown, a first fluid channel 112 and a second fluid channel 113 are formed in the housing 150. The first fluid channel 112 extends through the cylindrical section 151 and the trumpet-shaped section 152, and the second fluid channel 113 extends through the branch section 153 and the cylindrical section 151, and is connected to the first fluid channel 112. The inlet of the first fluid channel 112 is the water inlet 102. The inlet of the second fluid channel 113 is the foam liquid inlet 101. The outlet of the first fluid channel 112 is the mixed liquid outlet 103. Firefighting water (i.e., water) and foam liquid flow into the first fluid channel 112 and the second fluid channel 113 of the proportioning mixer 100 from the water inlet 102 and the foam liquid inlet 101, respectively, and then the foam liquid in the second fluid channel 113 flows into the first fluid channel 112 again, mixes with the firefighting water in the first fluid channel 112, and flows out from the mixed liquid outlet 103 together. The proportioning mixer 100 further includes a regulating valve 120 disposed in the second fluid channel 113, and the regulating valve 120 can be adjusted based on the flow rate Q1 of the firefighting water entering the first fluid channel 112, thereby changing the flow rate Q2 of the foam entering the first fluid channel 112 from the second fluid channel 113, which will be described in detail later. In the embodiment shown in 1B, when in use, the first fluid channel 112 is arranged horizontally, and the second fluid channel 113 is arranged vertically. In some other embodiments, when in use, the first fluid channel 112 can be arranged vertically, and the second fluid channel 113 can be arranged horizontally.

[0028] Still like Figure 1B As shown, the first fluid channel 112 includes a successively connected contraction section 106, a throat 107 and a diffusion section 108. The cross section (i.e., the fluid flow area) of the contraction section 106 gradually decreases from the end forming the water inlet 102 to the end connected to the throat 107, while the fluid flow area of ​​the diffusion section 108 gradually increases from the end connected to the throat 107 to the end forming the mixed liquid outlet 103. The fluid flow area of ​​the throat 107 remains substantially unchanged and is equal to the minimum flow area of ​​the contraction section 106 and the minimum flow area of ​​the diffusion section 108.

[0029] Figure 2A for Figure 1B The three-dimensional cross-sectional view of the portion outside the dotted line frame is used to show how the first fluid channel 112 and the second fluid channel 113 are connected. Figure 2AAs shown, the diffuser section 108 of the first fluid channel 112 is formed in the trumpet section 152, while the contraction section 106 and the throat 107 are formed by the internal shell structure 255 located in the cylindrical section 151. The internal shell structure 255 is also trumpet-shaped, and an annular cavity 210 surrounding the internal shell structure 155 is formed between the internal shell structure 255 and the cylindrical section 151, and the second fluid channel 113 extends into the cavity 210. A communication port 209 is provided on the internal shell structure 255 at the throat 107, and the communication port 209 penetrates the internal shell structure 255 to connect the second fluid channel 113 with the first fluid channel 112. The communication port 209 is set as an annular opening arranged around the circumference of the throat 107. By providing the annular communication port 209 and the annular cavity 210, the foam liquid in the second fluid channel 113 can enter the first fluid channel 112 along the circumference of the first fluid channel 112, so that the foam liquid and water are mixed more evenly.

[0030] like Figure 1B and 2A As shown, the fire water at the water inlet 102 usually has a certain supply pressure P1 from the water source, and the foam water at the foam inlet usually has a certain supply pressure P3 from the foam source. The above-mentioned setting of the first fluid channel 112 allows the Venturi effect to occur in the first fluid channel 112. According to the Venturi effect, when the fire water entering the first fluid channel 112 from the water inlet 102 flows through the contraction section 106 and reaches the throat 107, the flow rate of the fire water in the throat 107 increases due to the reduction of the fluid flow area, but the pressure decreases, thereby generating a negative pressure P2 near the connecting port 209 of the throat 107 (i.e., the entrance of the foam liquid from the second fluid channel 113 to the first fluid channel 112). The negative pressure P2 reflects the pressure loss of the fire water (i.e., the pressure reduction) and is related to the flow rate of the fire water. The negative pressure P2 can produce an adsorption effect on the foam liquid in the second fluid channel 113, thereby affecting the flow rate of the foam liquid entering the first fluid channel 112 from the second fluid channel 113. Here, we also refer to this negative pressure as adsorption pressure P2. It should be noted that P1, P2, and P3 actually refer to the pressure at the corresponding cross-section of the fluid, that is, the force of the fluid acting vertically on a unit area.

[0031] The flow rate Q1 of water in the first fluid channel 112 at the water inlet 102 (hereinafter referred to as "water flow rate Q1") and the flow rate Q2 of foam liquid entering the first fluid channel 112 from the second fluid channel 113 at the connecting port 209 (hereinafter referred to as "foam liquid flow rate Q2") determine the proportion of foam liquid in the mixed liquid provided by the proportioning mixer 100. It is usually necessary to keep the proportion of foam liquid in the mixed liquid within a certain range of about 3% or a certain range of about 6% to meet the optimal fire extinguishing ratio required by the standard. The foam liquid flow rate Q2 is jointly determined by the foam supply pressure P3, the adsorption pressure P2 and the fluid flow area of ​​the regulating valve 120. Since the foam supply pressure P3 is controllable, if the fluid flow area of ​​the regulating valve 120 remains unchanged, the foam liquid flow rate Q2 can be generally only affected by the adsorption pressure P2. If the adsorption pressure P2 and the water flow rate Q1 have a predictable relationship (for example, a linear relationship), then the foam liquid flow rate Q2 can be affected by the water flow rate Q1 and automatically change according to the expected formula when the water flow rate Q1 changes, so that the proportion of foam liquid in the mixed liquid can always meet the requirements.

[0032] However, the adsorption pressure P2 does not always have a predictable relationship with the water flow rate Q1. Usually, the adsorption pressure P2 is affected by the boundary conditions of the fluid turbulence and the foam inlet end (i.e., the connecting port 209). Under ideal conditions, that is, when the influence of the boundary conditions of the fluid turbulence and the foam inlet end (i.e., the connecting port 209) is completely ignored, an expected linear relationship can be established between P2 and Q1, and the expected value of P2 can be calculated from the known Q1 based on the expected linear relationship. When the water flow rate Q1 is within a certain range, the adsorption pressure P2 is less affected by the boundary conditions of the fluid turbulence and the foam inlet end (i.e., the connecting port 209). Even if there is a slight difference between the actual value of the adsorption pressure P2 and the expected value, it can be regarded that the water flow rate Q1 roughly maintains the expected linear relationship with the adsorption pressure P2, which can ensure that the mixing ratio of the foam liquid and the fire water is within the range required for fire fighting. However, when the range of the water flow rate Q1 is large, the adsorption pressure P2 is greatly affected by the fluid turbulence and the boundary conditions of the foam inlet end (i.e., the connecting port 209). Therefore, the water flow rate Q1 cannot be linearly related to the adsorption pressure P2, and the difference between the actual value and the expected value of the adsorption pressure P2 is large, resulting in the mixing ratio of the foam liquid and the fire water failing to meet the fire protection requirements.

[0033] To this end, the present application provides a regulating valve 120 whose opening can be automatically adjusted, which is used to change the flow area of ​​the fluid flowing through the regulating valve 120 when the range of the water flow rate Q1 is large, and thereby affect the foam liquid flow rate Q2, so that the foam liquid flow rate Q2 is changed under the dual influence of the adsorption pressure P2 and the opening of the regulating valve 120, thereby meeting the mixing ratio requirement of the foam liquid and water.

[0034] Figure 2B for Figure 1B The partially enlarged view of the dotted line frame portion is used to illustrate the specific structure of the regulating valve 120. Figure 2B As shown, the regulating valve 120 includes an orifice plate 221, a floating assembly 244 and a blocking member 229. The orifice plate 221 is provided with at least two through holes 222. The orifice plate 221 and the branch section 153 are perpendicular to each other, so that the orifice plate 221 is vertically connected to the second fluid channel 113, so that the foam liquid entering from the inlet of the second fluid channel 113 (i.e., the foam liquid inlet 101) can only flow through the orifice plate 221 from the through holes 222 on the orifice plate 221, and then flow into the first fluid channel 112. The floating assembly 244 is connected to the orifice plate 221 so as to be movable up and down. The blocking member 229 is provided on the floating assembly 244 and can move with the movement of the floating assembly 244 to open or close at least a part of the at least two through holes 222 on the orifice plate 221, so as to reduce or increase the flow area on the orifice plate 221 for the foam liquid to flow through.

[0035] The floating assembly 244 includes an upper support plate 226, a lower support plate 227 and a connecting rod 225, wherein the connecting rod 225 passes through the orifice plate 221 to connect the upper support plate 226 and the lower support plate 227 so that the upper support plate 226 and the lower support plate 227 can move together. The floating assembly 244 is subjected to the supply pressure P3 and the adsorption pressure P2 of the foam liquid in the second fluid channel 113, and both pressures act downward on the floating assembly 244, so that the floating assembly 244 is subjected to two downward forces. Specifically, the supply pressure P3 of the foam liquid acts on the upper support plate 226, so that the upper support plate 226 is subjected to the force F1, and the adsorption pressure P2 acts on the lower support plate 227, so that the lower support plate 227 is subjected to the force F2. As an example, the surface area of ​​the upper support plate 226 is equal to the surface area of ​​the lower support plate 227.

[0036] The blocking member 229 includes at least one push rod extending from the upper surface of the lower support plate 227 toward the through hole 222 of the orifice plate 221. When the upper support plate 226 and the lower support plate 227 move up and down together, the push rod can be inserted into the through hole 222 to close at least a portion of the through hole, or the push rod can leave the through hole 222 to open the portion of the through hole. As an example, the push rod of the blocking member 229 can be set to have different lengths. It should be noted that the blocking member 229 may also include at least one push rod extending from the lower surface of the upper support plate 226 toward the through hole 222 of the orifice plate 221, or push rods are provided on the lower surface of the upper support plate 226 and the upper surface of the lower support plate 227.

[0037] The regulating valve 120 further includes a spring 243, which is sleeved on the connecting rod 225, one end of which is fixed to the lower surface of the orifice plate 221, and the other end of which is connected to the upper surface of the lower support plate 227. As described above, the floating assembly 244 is subjected to a downward fluid force from the fluid (i.e., the sum of the force F2 of the adsorption pressure P2 acting on the lower support plate 227 and the force F1 of the supply pressure P3 of the foam liquid acting on the upper support plate 226), so the spring 243 applies an upward pulling force to the floating assembly 244, so that the floating assembly 244 can be connected to the orifice plate 221 in a floating manner, and the upper support plate 226 and the lower support plate 227 will not abut against the orifice plate 221. When the water flow Q1 remains unchanged, the floating assembly 244 is in a stable state and does not move relative to the orifice plate 221, and the fluid force on the floating assembly 244 is balanced with the elastic force of the spring 243. When the water flow Q1 changes, the adsorption pressure P2 changes, and the fluid force on the floating assembly 244 also changes. Due to the action of the spring 243, the floating assembly 244 moves upward or downward until the fluid force on the floating assembly 244 and the elastic force of the spring 243 reach a balance again. As the floating assembly 244 moves up and down, the length of the spring 243 can decrease or increase, so that the elastic force of the spring 243 decreases or increases. By presetting the elastic coefficient of the spring 243 and the height of the push rod, when Q1 increases or decreases by a certain value, the moving stroke of the spring 243 allows the push rod to just open or close a part of the through hole 222, so that the adjustment process of the regulating valve 120 is automatically performed based on the size of the water flow Q1.

[0038] Those skilled in the art should understand that the spring 243 may also be other elastic components that can apply elastic force to the floating assembly 244. And because the upper support plate 226 and the lower support plate 227 move together, the spring 243 may also be fixed to the upper surface of the orifice plate 221 at one end and connected to the lower surface of the upper support plate 226 at the other end.

[0039] Since the flow rate Q1 of the fire water entering the first fluid channel 112 affects the adsorption pressure P2, the pressure difference between the foam liquid supply pressure P3 and the adsorption pressure P2 (i.e., the sum of the absolute values ​​of the pressures between the foam liquid supply pressure P3 and the adsorption pressure P2) can reflect the flow rate of the fire water. According to the flow rate Q1 of the fire water, the force F1 of the foam liquid supply pressure P3 acting on the upper support plate 226, the force F2 of the adsorption pressure P2 acting on the lower support plate 227, and the elastic force of the spring 243 will jointly cause the upper support plate 226 and the lower support plate 227 to move up and down relative to the orifice plate 221, and drive the top rod to move up and down to open or close at least a part of the through holes 222.

[0040] When the adsorption pressure P2 is significantly different from the expected value, the inflow of the foam liquid will be significantly different from the expected value, and the fire water and the foam liquid will not meet the requirements of proportional mixing. At this time, the inflow of the foam liquid can be changed by opening or closing at least a part of the through holes 222, so that the ratio of the foam liquid to the fire water can meet the requirements. When a part of the through holes 222 on the orifice plate 221 is opened, the flow area of ​​the foam liquid flowing through the orifice plate 221 increases, which can increase the inflow of the foam liquid; when a part of the through holes 222 on the orifice plate 221 is closed, the flow area of ​​the foam liquid flowing through the orifice plate 221 decreases, which can reduce the inflow of the foam liquid.

[0041] The regulating valve 120 may be disposed in the second fluid passage 113 by any structure known in the art. Figure 2B In the illustrated embodiment, a valve mounting structure 250 similar to a valve seat is provided at the upper portion of the branch section 153 of the proportioning mixer 100, and the valve mounting structure 250 is detachably mounted on the lower portion of the branch section 153, and the regulating valve 120 is detachably mounted in the valve mounting structure 250. The fluid channel in the valve mounting structure 250 and the fluid channel in the lower portion of the branch section 153 together form the second fluid channel 113. Specifically, the valve mounting structure 250 includes a lower sleeve 232, an upper sleeve 231 and an outer sleeve 233, and the outer sleeve 233 connects the lower sleeve 232 and the upper sleeve 231 together through a fastening structure such as a thread. The lower sleeve 232 is connected to the lower portion of the branch section 153 through a fastening structure such as a thread. The orifice plate 221 of the regulating valve 120 is connected to the upper sleeve 231 and / or the lower sleeve 232, so that the regulating valve 120 is fixed inside the valve mounting structure 250. As a specific example, the lower sleeve 232 has a circle of bosses 239 protruding inwardly inside, and the top edge of the orifice plate 221 of the regulating valve 120 has a circle of flanges 236, the lower surface of the flange 236 abuts against the bosses 239 of the lower sleeve 232 from above through a sealing ring 238, and the upper surface of the flange 236 abuts against the upper sleeve 231 from below. Therefore, when the outer sleeve 233 connects the lower sleeve 232 and the upper sleeve 231 together, the upper sleeve 231 and the lower sleeve 232 can sandwich the orifice plate 221 in the middle from both the upper and lower directions to fix the orifice plate 221, thereby connecting the regulating valve 120 to the valve mounting structure 250. As an optional example, a sealing ring 237 is also provided at the connection between the upper sleeve 231, the lower sleeve 232 and the outer sleeve 233.

[0042] It should be noted that in other examples, the first fluid channel 112 can also be arranged longitudinally, while the second fluid channel 113 is arranged transversely. In this case, the regulating valve 120 is longitudinally connected in the second fluid channel 113, and the floating assembly 244 and the blocking member 229 move transversely (left and right) relative to the orifice plate 221.

[0043] Figure 3 FIG. 2 is a three-dimensional structural diagram of the regulating valve 120 without the spring 243, which is used to more clearly illustrate the specific structure of the regulating valve 120. Figure 3 As shown, the orifice plate 221 of the regulating valve 120 is generally a circular plate, wherein the upper edge thereof protrudes outward to form a flange 236. The orifice plate 221 is provided with eight through holes 222 (see Figure 4 ). The connecting rod 225 passes through the orifice plate 221 to connect the upper support plate 226 and the lower support plate 227 together. The lower support plate 227 is provided with four top rods 229 extending toward the orifice plate 221, wherein the four top rods 229 are of different lengths. Figure 3 Only three push rods 229 are shown in the stereogram shown, but those skilled in the art will appreciate that Figure 3 There is also a push rod 229 on the rear side which is blocked by the connecting rod 225. Figure 3 In the illustrated embodiment, the ejector rods 229 include two long ejector rods 342 and two short ejector rods 341. When the upper support plate 226 and the lower support plate 227 move relative to the orifice plate 221 in a certain stroke, the long ejector rods 342 can be inserted into two through holes therein to close the two through holes, while the short ejector rods 341 cannot be inserted into the other two through holes to open the two through holes. Thus, by providing ejector rods 229 of different lengths, the number of through holes 222 opened or closed can be changed twice, thereby adjusting the flow rate of the foam liquid twice. Specifically, when the elastic coefficient k of the spring 243 is constant, by presetting a certain fire water flow rate Q1 (for example, by comparing with a proportional mixer that does not contain a regulating valve 120 to determine the preset fire water flow rate Q1 value), the actual value of the corresponding preset adsorption pressure P2 can be measured. According to the formula F1+F2=kx, the sum of the force F1 acting on the upper support plate 226 by the foam liquid supply pressure P3 and the force F2 acting on the lower support plate 227 by the actual value of the adsorption pressure P2 can be calculated to obtain the preset moving stroke of the spring 243 (i.e., the stretching length x), and the preset moving stroke of the spring 243 is used as a threshold to set the length of the short push rod 341 or the long push rod 342, so that when the deformation of the spring 243 stretched downward reaches the preset moving stroke, it can just open a part of the inner circle through hole 482 or open all of the inner circle through holes 482. For example, when the deformation of the spring 243 reaches a preset first moving stroke (i.e., a first stretching length), the short push rod 341 can open two through holes, and when the deformation of the spring 243 reaches a preset second moving stroke (i.e., a second stretching length), the long push rod 342 can open another two through holes.

[0044] Figure 4FIG. 2 is a top view of the orifice plate 221, which is used to illustrate the specific structure of the through hole 222 in the orifice plate 221. Figure 4 As shown, at least two through holes 222 include eight through holes, which are arranged in two circles of through holes, and each circle is evenly provided with four through holes. Among them, the four inner circle through holes 482 can be opened or closed by the push rod 229 of the regulating valve 120, while the outer circle through holes 481 remain open. It should be known to those skilled in the art that in order to ensure that the push rod 229 can open or close the inner circle through holes 482, the inner circle through holes 482 need to be aligned with the push rod 229. It should be noted that the through holes 222 can also be set to other numbers or arranged in other ways, and it is only necessary to set the number and position of the push rod 229 accordingly.

[0045] A mounting hole 483 is also provided at the center of the orifice plate 221, and the connecting rod 225 passes through the mounting hole 483 to connect the upper support plate 226 and the lower support plate 227 to the upper and lower sides of the orifice plate 221. As an example, four slots are evenly provided at the edge of the mounting hole 483, and the connecting rod 225 may be at least partially provided with a convex rib (not shown in the figure) protruding outward along the radial direction of the connecting rod 225, and the slot and the convex rib are arranged in cooperation to prevent the connecting rod 225 from rotating relative to the orifice plate 221. Of course, other anti-rotation structures may also be provided between the orifice plate 221 and the connecting rod 225, which can limit the connecting rod 225 to only move along the axial direction of the connecting rod 225 (i.e., up and down movement or longitudinal movement) relative to the orifice plate 221.

[0046] Figures 5A-5C The figure shows a cross-sectional view of a regulating valve 120 according to an embodiment of the present application in three different working states. The regulating valve 120 is used for a proportioning mixer in a certain proportioning mixing device. For the proportioning mixer used in such a proportioning mixing device, when the flow rate Q1 of the fire water (i.e., the flow rate of the fire water) has a large range, the actual value of the adsorption pressure P2 is always larger than the expected value (i.e., the actual value of the absolute value of the negative pressure P2 is always smaller than the expected value), so that the actual flow rate of the foam liquid tends to be smaller than the expected value (if the regulating valve 120 of the present application is not provided). As an example, including Figures 5A-5C The proportioning mixer of the regulating valve 120 shown may be suitable for a balanced proportioning mixing device.

[0047] Figures 5A-5C It is used to illustrate the process of automatically adjusting the flow area of ​​the foam flowing through the regulating valve 120 when the flow rate Q1 (i.e., the flow rate of the fire water) of the proportioning mixer changes from small to large within a larger range (e.g., 4-100 L / S). Figures 5A-5C In the working state shown, the fluid force on the floating assembly 244 is balanced with the elastic force of the spring 243. Figure 5AFIG. 4 shows a state in which the regulating valve 120 is in a state in which the outer ring through hole 481 is open and the inner ring through holes 482 are all closed. Figure 5B FIG. 4 shows a state in which the regulating valve 120 is in a state in which the outer ring through hole 481 is open, a part of the inner ring through hole 482 is open, and another part of the inner ring through hole 482 is closed. Figure 5C FIG. 3 shows a state where the regulating valve 120 is in a state where the inner ring through holes 482 and the outer ring through holes 481 are fully opened.

[0048] In such Figure 5A In the state shown, the flow rate Q1 of the fire water is minimum, the pressure loss of the fire water is minimum, the adsorption pressure P2 at the connection port reaches the maximum (that is, the absolute value of the negative pressure P2 is minimum), and the force F2 on the support plate 227 under the adsorption pressure P2 is minimum. Since the force of the foam liquid supply pressure P3 acting on the upper support plate 226 remains unchanged, the tensile elastic force of the spring 243 is minimum at this time, that is, the deformation of the spring 243 stretched downward is minimum, and the floating assembly 244 is at the uppermost position relative to the orifice plate 221. The long push rod 342 and the short push rod 341 are both inserted into the inner circle through hole 482 to close all the inner circle through holes 482. At this time, only the outer circle through hole 481 on the orifice plate 221 is open, and the inner circle through holes 482 are all closed, so that the foam liquid flow rate Q2 is also correspondingly minimum.

[0049] In such Figure 5B In the state shown, Figure 5A Compared with the state shown in FIG. 1 , the flow rate Q1 of the fire water increases, the pressure loss of the fire water increases, the adsorption pressure P2 decreases (that is, the absolute value of the negative pressure P2 increases), and the force F2 acting on the lower support plate 227 by the adsorption pressure P2 increases. Since the force F1 acting on the upper support plate 226 by the foam liquid supply pressure P3 remains unchanged, Figure 5A In comparison, the tensile elastic force of the spring 243 increases due to the increase of F2, the downward deformation of the spring 243 increases and reaches the first moving stroke (i.e., the first stretching length), and the floating assembly 244 moves downward a certain distance relative to the orifice plate 221, but the long push rod 342 is still inserted into a part of the inner ring through hole 482 to close this part of the inner ring through hole 482, while the short push rod 341 leaves the other part of the inner ring through hole 482 to open this part of the inner ring through hole 482.

[0050] At this time, since the fire water and foam liquid are affected by fluid turbulence and boundary conditions, the adsorption pressure P2 has a certain gap with the expected value. If the floating assembly 244 does not move downward to open a part of the inner circle through holes 482, the flow rate Q2 of the foam liquid will be less than the expected value. At this time, a part of the inner circle through holes 482 on the orifice plate 221 is opened, so that the flow rate Q2 of the foam liquid can be compensated, and the mixing ratio requirement of the fire water and the foam liquid is met.

[0051] In such Figure 5C In the state shown, Figure 5A and 5B Compared with the state shown in FIG. 1 , the flow rate Q1 of the fire water reaches the maximum, the pressure loss of the fire water also reaches the maximum, the adsorption pressure P2 is the minimum (i.e., the absolute value of the negative pressure P2 is the maximum), and the force F2 exerted by the adsorption pressure P2 on the lower support plate 227 is the maximum. Since the force F1 exerted by the foam liquid supply pressure P3 on the upper support plate 226 remains unchanged, the tensile elastic force of the spring 243 reaches the maximum, the deformation amount of the spring 243 stretched downward is the maximum and reaches the second moving stroke (i.e., the second stretching length), the floating assembly 244 is at the lowest position relative to the orifice plate 221, and the long push rod 342 and the short push rod 341 both leave the inner circle through hole 482 to open all the inner circle through holes 482.

[0052] At this time, since the fire water and foam liquid are affected by fluid turbulence and boundary conditions, the adsorption pressure P2 has a larger gap with the expected value. If the floating assembly 244 does not move downward to open all the inner circle through holes 482, the flow rate Q2 of the foam liquid will be less than the expected value. At this time, all the inner circle through holes 482 on the orifice plate 221 are opened together to compensate for the flow rate of the foam liquid to a greater extent, meeting the mixing ratio requirements of the fire water and the foam liquid.

[0053] Figure 6 FIG. 6 is a cross-sectional view of a regulating valve 620 according to another embodiment of the present application. In this embodiment, the push rods 651 and 652 are arranged to extend from the lower surface of the upper support plate 626 toward the through hole of the orifice plate 221 , while no push rod is arranged on the lower support plate 627 .

[0054] Figure 6 The regulating valve 620 in the shown embodiment is used for a proportional mixer in another proportional mixing device. In this proportional mixing device, the actual value of the adsorption pressure P2 is always smaller than the expected value (that is, the actual value of the absolute value of the negative pressure P2 is always larger than the expected value). If the regulating valve 620 of this embodiment is not set, the actual flow rate Q2 of the foam liquid will be greater than the expected value, resulting in the mixing ratio of fire water and foam liquid failing to meet fire protection requirements.

[0055] In this embodiment, when the spring 243 is stretched downward and deformed to a predetermined travel distance (i.e., stretching length), a portion of the inner ring through hole 482 can be closed, thereby reducing the flow rate of the foam liquid. In this embodiment, the ejector rod includes a long ejector rod 652 and a short ejector rod 651, so the flow rate Q2 of the foam liquid can also be reduced twice.

[0056] As a more specific example, Figure 6 The proportioning mixer of the regulating valve 620 shown may be applicable to a pressure-type proportioning mixing device.

[0057] Figure 7 FIG. 2 shows a cross-sectional view of a regulating valve 720 according to another embodiment of the present application. In this embodiment, a portion of the push rod 751 is configured to extend from the lower surface of the upper support plate 726 toward the through hole of the orifice plate 221, and another portion of the push rods 341 and 342 is configured to extend from the upper surface of the lower support plate 727 toward the through hole of the orifice plate 221.

[0058] Figure 7 The regulating valve 720 in the illustrated embodiment is used for a proportioning mixer in another proportioning mixing device. In this proportioning mixing device, when the water flow rate Q1 is within a first range, the actual value of the adsorption pressure P2 is greater than the expected value (i.e., the actual value of the absolute value of the negative pressure P2 is smaller than the expected value). If the regulating valve 720 of the present application is not provided, the actual flow rate Q2 of the foam liquid will be less than the expected value, resulting in the mixing ratio of the fire water and the foam liquid failing to meet the fire requirements. When the water flow rate Q1 is within a second range greater than the first range, the actual value of the adsorption pressure P2 will be smaller than the expected value (i.e., the actual value of the absolute value of the negative pressure P2 is greater than the expected value). If the regulating valve 720 of the present application is not provided, the actual flow rate Q2 of the foam liquid will be greater than the expected value, resulting in the mixing ratio of the fire water and the foam liquid failing to meet the fire requirements.

[0059] In this embodiment, when the water flow Q1 increases to make the floating assembly 744 move downward, the flow area of ​​the foam flowing through the regulating valve 720 can be increased or reduced. When the water flow Q1 is within the first range, the floating assembly 744 moves downward, and when the amount of deformation of the spring 243 stretched downward reaches a predetermined movement stroke (i.e., stretching length) corresponding to the top rods 341 and 342, at least a portion of the inner ring through hole 482 can be opened to increase the foam liquid flow Q2.

[0060] When the water flow Q1 increases to be within the second range, the floating assembly 744 continues to move downward, and when the downward deformation of the spring 243 reaches a predetermined moving stroke (i.e., stretching length) corresponding to the top rod 751, at least a portion of the inner ring through hole 482 can be closed to reduce the foam liquid flow Q2.

[0061] The proportioning mixer 100 of the present application is able to automatically adjust the flow rate Q2 of the foam liquid entering the first fluid channel 112 from the second fluid channel 113 based on the flow rate Q1 of the fire water entering the first fluid channel 112 by setting a regulating valve 120 in the second fluid channel 113, thereby ensuring that the mixing ratio of the fire water and the foam liquid is within the ratio range required by the fire fighting. Therefore, the proportioning mixer 100 of the present application is particularly suitable for situations where the flow rate range of the fire water is large. In addition, the proportioning mixer 100 of the present application does not make much change to the existing proportioning mixer, the improvement cost is low, and the practicality is strong.

[0062] Although the present application will be described with reference to the specific embodiments shown in the accompanying drawings, it should be understood that the proportioning mixer of the present application can have many variations without departing from the spirit and scope and background of the teachings of the present application. Those skilled in the art will also appreciate that there are different ways to change the structural details in the embodiments disclosed in the present application, all falling within the spirit and scope of the present invention and claims.

Claims

1. A proportioning mixer, characterized in that: The proportioning mixer (100) comprises: Housing (150); A first fluid channel (112), the first fluid channel (112) is formed in the housing (150) and is used for circulating water, the first fluid channel (112) comprising: A contraction section (106), a throat (107) and a diffusion section (108), wherein the throat (107) is arranged between the contraction section (106) and the diffusion section (108); a second fluid channel (113), the second fluid channel (113) being formed in the housing (150) and used for circulating foam liquid; a communication port (209), the communication port (209) being arranged on the housing (150) at the throat (107) of the first fluid channel (112) and being arranged to connect the first fluid channel (112) and the second fluid channel (113) so that the foam liquid flowing in the second fluid channel (113) can enter the first fluid channel (112); a regulating valve (120), the regulating valve (120) being arranged in the second fluid passage (113), the regulating valve (120) being configured to be adjustable based on the flow rate of water entering the first fluid passage (112), thereby changing the flow rate of foam liquid entering the first fluid passage (112) from the second fluid passage (113), Wherein, the regulating valve (120) comprises: An orifice plate (221), wherein the orifice plate (221) has at least two through holes (222); a blocking member (229), the blocking member (229) being configured to be able to move relative to the orifice plate (221) as the pressure at the communication port (209) changes, so as to open or close at least a portion of the at least two through holes (222), thereby changing the flow rate of the foam liquid in the second fluid channel (113), wherein the pressure at the communication port (209) reflects the flow rate of the water entering the first fluid channel (112); A floating assembly (244), wherein the floating assembly (244) is movably connected to the orifice plate (221), the blocking member (229) is disposed on the floating assembly (244) and moves along with the movement of the floating assembly (244), and the floating assembly (244) comprises: an upper support plate (226), the upper support plate (226) being arranged on a first side of the orifice plate (221); a lower support plate (227), the lower support plate (227) being disposed on a second side of the orifice plate (221); and a connecting rod (225), wherein the connecting rod (225) passes through the orifice plate (221) to connect the upper support plate (226) and the lower support plate (227), so that the upper support plate (226) and the lower support plate (227) move together; and An elastic component (243), wherein the elastic component (243) has a first end and a second end, wherein the first end of the elastic component (243) is fixed relative to the orifice plate (221), and the second end of the elastic component (243) is supported to the upper support plate (226) or the lower support plate (227).

2. The proportioning mixer according to claim 1, characterized in that: The orifice plate (221) is connected inside the second fluid channel (113), and the inlet (101) of the second fluid channel (113) is in fluid communication with the communication port (209) via the at least two through holes (222).

3. The proportioning mixer according to claim 1, characterized in that: The orifice plate (221) is vertically connected in the second fluid channel (113).

4. The proportioning mixer according to claim 1, characterized in that: The floating assembly (244) is capable of moving relative to the orifice plate (221) along the second fluid channel (113) based on the pressure at the communication port (209), thereby driving the blocking member (229) to move into or out of the at least two through holes (222).

5. The proportioning mixer according to claim 1, characterized in that: wherein the connecting rod (225) is perpendicular to the upper support plate (226) and the lower support plate (227); The pressure at the inlet (101) of the second fluid channel (113) is reflected on the upper support plate (226), and the pressure at the communication port (209) is reflected on the lower support plate (227).

6. The proportioning mixer according to claim 1, characterized in that: The elastic component (243) is capable of applying an elastic force to the upper support plate (226) or the lower support plate (227).

7. The proportioning mixer according to claim 1, characterized in that: The blocking member (229) includes at least one push rod, each of the at least one push rod extends from a surface of the upper support plate (226) or the lower support plate (227) and is aligned with one of the at least two through holes (222); or A portion of the at least one push rod extends from the lower surface of the upper support plate (226) and is aligned with one of the at least two through holes (222), and another portion of the at least one push rod extends from the upper surface of the lower support plate (227) and is aligned with one of the at least two through holes (222).

8. The proportioning mixer according to claim 7, characterized in that: The at least one push rod comprises at least two push rods, and the at least two push rods have different lengths.

9. The proportioning mixer according to claim 1, characterized in that: The elastic component (243) includes a spring, which is arranged between the orifice plate (221) and the upper support plate (226) or the lower support plate (227), wherein one end of the spring is connected to the orifice plate (221) and the other end of the spring abuts against the upper support plate (226) or the lower support plate (227).

10. The proportioning mixer according to claim 1, characterized in that: The at least two through holes (222) include at least two circles of through holes, and the blocking member (229) is configured to be able to open or close the through holes of the inner circle of the at least two circles of through holes.

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