Heptafluoropropane foam fire extinguishing system

Abstract

A heptafluoropropane foam fire extinguishing system comprises a proportional mixer, a foam mixed liquid pipeline and a heptafluoropropane pipeline, and a pressure reducing valve, a control valve and an adjusting valve are sequentially arranged on the heptafluoropropane pipeline. The regulating valve comprises a valve body, a valve cover, a positioning sleeve and an elastic valve rod assembly; the valve body comprises a first pipe and a second pipe; a partition plate is arranged in the second pipe, a pressure taking cavity is formed between the partition plate and the positioning sleeve, a first pressure taking opening is formed in the side wall of the pressure taking cavity, a second pressure taking opening is formed in the end, close to the foam mixed liquid pipeline, of the proportional mixer, and the second pressure taking opening is communicated with the first pressure taking opening through a pressure taking pipe; a liquid passing window of a symmetrical structure is formed in the first pipe, and the bottom of the elastic valve rod assembly penetrates through the partition plate and extends into the first pipe. The pressure change of foam mixed liquid directly acts on the elastic valve rod assembly to drive the stroke change of the elastic valve rod assembly, so that the flow passing area of the liquid passing window is adjusted, the foam mixed liquid and heptafluoropropane reach a stable mixing ratio, and the flow range of the device is expanded.

Description

Technical Field

[0001] This invention relates to the field of fire protection equipment technology, specifically to a heptafluoropropane foam fire extinguishing system. Background Technology

[0002] The heptafluoropropane foam fire extinguishing system mainly consists of a heptafluoropropane pipeline network. A pressure reducing valve reduces the pipeline pressure to 1.2 MPa, and then a proportioning mixer mixes the agent output from the pipeline with the foam mixture to a certain proportion before extinguishing the fire.

[0003] During injection into the mixer, since the pressure of heptafluoropropane remains constant at 1.2 MPa while the pressure of the foam mixture varies between 0.6 and 1.2 MPa, a regulating valve is used for adjustment. However, existing equipment typically uses a flow-limiting orifice plate for adjustment, which limits the amount of reagent entering the mixer to achieve the desired mixing ratio, thus hindering the expansion of the device's flow range. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a heptafluoropropane foam fire extinguishing system to improve the range of drug dosages that can achieve the required mixing ratio, thereby expanding the flow range of the device.

[0005] A heptafluoropropane foam fire extinguishing system includes a proportioner, a foam mixture pipeline and a heptafluoropropane pipeline connected to the proportioner, wherein a pressure reducing valve, a control valve and a regulating valve are sequentially provided on the heptafluoropropane pipeline, the regulating valve is connected to the proportioner, and the pressure reducing valve is connected to the heptafluoropropane pipeline network. The regulating valve includes a valve body, a valve cover disposed on the valve body, a positioning sleeve embedded between the valve body and the valve cover, and an elastic valve stem assembly installed between the valve cover and the positioning sleeve and extending into the valve body. The valve body includes a first pipe and a second pipe disposed on the first pipe, one end of the first pipe being connected to the control valve and the other end being connected to the proportional mixer; The second tube is provided with a baffle, and a pressure tapping chamber is formed between the baffle and the positioning sleeve. A first pressure tapping port is provided on the side wall of the pressure tapping chamber. A second pressure tapping port is provided on the end of the proportioning mixer near the foam mixture pipeline. The second pressure tapping port and the first pressure tapping port are connected through a pressure tapping tube. The first tube is provided with a symmetrical liquid passage window. The bottom of the elastic valve stem assembly passes through the partition and extends into the first tube. When the pressure in the foam mixture pipeline changes, the pressure in the pressure tapping chamber acts directly on the elastic valve stem assembly, causing the elastic valve stem assembly to rise or fall, so that the liquid passage window opens or closes accordingly.

[0006] Preferably, the cross-section of the liquid-passing window is inverted I-shape and located in the lower middle position inside the first tube.

[0007] Preferably, the liquid-passing window includes a first window at the top, a second window at the bottom, and a vertical window connecting the first window and the second window; The first window has an inverted trapezoidal structure, and the second window has an arc-shaped structure.

[0008] Preferably, the side of the inverted trapezoidal structure is arc-shaped, and the circle containing the arc and the circle containing the inner wall of the first tube are concentric circles.

[0009] Preferably, the chord length in the bow-shaped structure is smaller than the pipe radius of the first pipe.

[0010] Preferably, the elastic valve stem assembly includes a valve core located on the positioning sleeve, the top end of the valve core being concentric with the valve cover via an adjusting stud, and a valve disc being provided at the bottom end, the valve disc being located in the first tube; The valve core is fitted with an upper positioning ring, a spring, and a lower positioning ring. The upper positioning ring contacts the adjusting stud, and the lower positioning ring contacts the convex ring on the valve core. The positioning sleeve limits the movement of the convex ring.

[0011] Preferably, the valve disc includes a cylindrical ring and a top cover disposed on the cylindrical ring, the top cover being connected to the valve core, and the outer wall of the cylindrical ring contacting the liquid passage window.

[0012] Preferably, the height of the cylindrical ring is greater than the radius of the first tube but less than the diameter of the first tube.

[0013] Preferably, the top cover has a through hole.

[0014] Preferably, a lower sealing ring is provided between the side wall of the valve core and the partition plate, and an upper sealing ring is provided between the side wall of the valve core and the positioning sleeve.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The pressure change of the foam mixture directly acts on the elastic valve stem assembly, causing the stroke of the elastic valve stem assembly to change, thereby adjusting the flow area of ​​the liquid window, so that the foam mixture and heptafluoropropane can reach a stable mixing ratio and expand the flow range of the device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the piping of the heptafluoropropane foam fire extinguishing system proposed in this invention. Figure 2 for Figure 1 Schematic diagram of the structure of the regulating valve; Figure 3 for Figure 2 A schematic cross-sectional view of the liquid passage window of the regulating valve; Figure 4 for Figure 2 Exploded view of the regulating valve; Figure 5 for Figure 2 Cross-sectional view of the regulating valve; Figure 6 for Figure 2 A cross-sectional view of the regulating valve from another perspective.

[0017] Explanation of key component symbols: 11-Proportional mixer; 12-Pressure reducing valve; 13-Control valve; 14-Regulating valve; 141-Valve body; 1411-First pipe; 1412-Second pipe; 1413-Baffle; 1414-First pressure tap; 142-Valve cover; 143-Positioning sleeve; 144-Elastic valve stem assembly; 1441-Valve core; 1442-Adjusting stud; 1443-Valve disc; 14431-Cylindrical ring; 14432-Top cover; 14433-Through hole; 1444-Upper positioning ring; 1445-Spring; 1446-Lower positioning ring; 1447-Protruding ring; 145-Liquid passage window; 1451-First window; 1452-Second window; 1453-Vertical window; 15-Check valve.

[0018] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0019] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0020] Please see Figures 1 to 6 An embodiment of the present invention provides a heptafluoropropane foam fire extinguishing system, including a proportioner 11, a foam mixture pipeline and a heptafluoropropane pipeline connected to the proportioner 11, wherein a pressure reducing valve 12, a control valve 13 and a regulating valve 14 are sequentially provided on the heptafluoropropane pipeline, the regulating valve 14 is connected to the proportioner 11, and the pressure reducing valve 12 is connected to the heptafluoropropane pipeline network. The regulating valve 14 includes a valve body 141, a valve cover 142 disposed on the valve body 141, a positioning sleeve 143 embedded between the valve body 141 and the valve cover 142, and an elastic valve stem assembly 144 installed between the valve cover 142 and the positioning sleeve 143 and extending into the valve body 141. The valve body 141 includes a first pipe 1411 and a second pipe 1412 disposed on the first pipe 1411. One end of the first pipe 1411 is connected to the control valve 13 and the other end is connected to the proportional mixer 11. The second pipe 1412 is provided with a partition 1413, and a pressure tapping cavity is formed between the partition 1413 and the positioning sleeve 143. A first pressure tapping port 1414 is provided on the side wall of the pressure tapping cavity. A second pressure tapping port is provided on one end of the proportioning mixer 11 near the foam mixture pipeline. The second pressure tapping port and the first pressure tapping port 1414 are connected through a pressure tapping pipe. The first tube 1411 is provided with a symmetrical liquid passage window 145. The bottom of the elastic valve stem assembly 144 passes through the partition 1413 and extends into the first tube 1411. When the pressure in the foam mixture pipeline changes, the pressure in the pressure tapping chamber acts directly on the elastic valve stem assembly 144, causing the elastic valve stem assembly 144 to rise or fall, so that the liquid passage window 145 opens or closes accordingly.

[0021] It should be noted that, in this invention, when the pressure in the pressure tapping chamber (i.e., the pressure of the foam mixture in the foam mixture pipeline) is greater than the preload of the elastic valve stem assembly 144, the elastic valve stem assembly 144 is pushed upward, thereby increasing the flow area of ​​the liquid passage window 145; when the pressure in the pressure tapping chamber is less than the preload of the elastic valve stem assembly 144, the elastic valve stem assembly 144 is lowered, thereby decreasing the flow area of ​​the liquid passage window 145.

[0022] Please see Figure 2 and Figure 3 In a preferred embodiment of the present invention, the cross-section of the liquid-passing window 145 is an inverted I-shape and is located in the lower middle position within the first tube 1411, so as to adapt to the elastic force of the elastic valve stem assembly 144 itself.

[0023] Please see Figure 2 and Figure 3 In a preferred embodiment of the present invention, the liquid transfer window 145 includes a first window 1451 located at the top, a second window 1452 located at the bottom, and a vertical window 1453 connecting the first window 1451 and the second window 1452. The first window 1451 has an inverted trapezoidal structure, and the second window 1452 has an arc-shaped structure.

[0024] In a preferred embodiment of the present invention, the side of the inverted trapezoidal structure is arc-shaped, and the circle containing this arc is concentric with the circle containing the inner wall of the first tube 1411. It is understood that in other embodiments, this arc coincides with the inner wall of the first tube 1411.

[0025] In a preferred embodiment of the present invention, the chord length in the bow-shaped structure is less than the pipe radius of the first pipe 1411.

[0026] Please see Figures 4 to 6 In a preferred embodiment of the present invention, the elastic valve stem assembly 144 includes a valve core 1441 located on the positioning sleeve 143. The top end of the valve core 1441 is kept concentric with the valve cover 142 by adjusting the stud 1442, and a valve disc 1443 is provided on the bottom end. The valve disc 1443 is located in the first tube 1411. The valve core 1441 is fitted with an upper positioning ring 1444, a spring 1445 and a lower positioning ring 1446. The upper positioning ring 1444 contacts the adjusting stud 1442, the lower positioning ring 1446 contacts the convex ring 1447 on the valve core 1441, and the positioning sleeve 143 limits the convex ring 1447.

[0027] It should be noted that in this invention, the convex ring 1447 has a T-shaped structure to prevent it from moving downwards past the positioning sleeve 143 under the force of the spring 1445. The compression degree of the spring 1445 is adjusted by adjusting the vertical position of the adjusting stud 1442, thereby adjusting the preload of the spring 1445. Specifically, in the initial position, the valve disc 1443 completely blocks the liquid passage window 145, meaning the regulating valve 14 is in the closed state. When the pressure in the pressure tapping chamber (i.e., the pressure of the foam mixture in the foam mixture pipeline, which acts on the bottom surface of the convex ring 1447) is greater than the preload of the spring 1445, it pushes the valve core 1441 and valve disc 1443 upward, thereby increasing the flow area of ​​the liquid passage window 145; when the pressure in the pressure tapping chamber is less than the preload of the spring 1445, under the action of the elastic force of the spring 1445 itself, it drives the valve core 1441 and valve disc 1443 downward, thereby reducing the flow area of ​​the liquid passage window 145.

[0028] Please see Figures 4 to 6 In a preferred embodiment of the present invention, the valve disc 1443 includes a cylindrical ring 14431 and a top cover 14432 disposed on the cylindrical ring 14431. The top cover 14432 is connected to the valve core 1441. The outer wall of the cylindrical ring 14431 contacts the liquid flow window 145 to adjust the flow area.

[0029] Please see Figures 4 to 6 In a preferred embodiment of the present invention, the height of the cylindrical ring 14431 is greater than the radius of the first tube 1411 and less than the diameter of the first tube 1411, so as to block the liquid passage window 145.

[0030] Please see Figure 4 In a preferred embodiment of the present invention, the top cover 14432 is provided with a through hole 14433, which allows the chamber above the valve disc 1443 and the chamber below the valve disc 1443 to communicate, thereby reducing the influence of the mainstream pressure on the valve disc 1443 and avoiding affecting the raising and lowering of the valve disc 1443.

[0031] In a preferred embodiment of the present invention, a lower sealing ring is provided between the side wall of the valve core 1441 and the partition plate 1413, and an upper sealing ring is provided between the side wall of the valve core 1441 and the positioning sleeve 143, so as to ensure the sealing performance of the pressure tapping chamber.

[0032] Please see Figure 1 In a preferred embodiment of the present invention, the inlet pressure of the pressure reducing valve 12 is 0~10MPa, and the outlet pressure is 0~2.5MPa. Since heptafluoropropane extinguishing agent is typically stored in cylinders at high pressure (e.g., 4.2MPa), if it were to directly enter the pipeline network during release, the excessively high pressure could damage components such as pipes and nozzles. The pressure reducing valve 12, through its internal throttling structure, stably reduces the high-pressure gas to the system's designed low-pressure level (e.g., 1.6MPa or lower), i.e., pressure regulation, to ensure safe system operation. Furthermore, even if the pressure within the heptafluoropropane extinguishing agent cylinder group changes with temperature or usage time, the pressure reducing valve 12 can automatically adjust to maintain a relatively constant outlet pressure, i.e., pressure stabilization, to ensure that the release rate and coverage effect of the heptafluoropropane extinguishing agent meet design requirements. Please see Figure 1 In a preferred embodiment of the present invention, a check valve 15 is provided between the regulating valve 14 and the proportioning mixer 11. The check valve 15 ensures that heptafluoropropane flows in a predetermined direction, preventing backflow or reverse flow when the system is not in operation.

[0033] In summary, the beneficial effects of the present invention are as follows: the pressure change of the foam mixture directly acts on the elastic valve stem assembly 144, causing a change in the stroke of the elastic valve stem assembly 144, thereby adjusting the flow area of ​​the liquid flow window 145, so that the foam mixture and heptafluoropropane reach a stable mixing ratio, and expanding the flow range of the device.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A heptafluoropropane foam fire extinguishing system, comprising a proportioner, a foam mixture pipeline and a heptafluoropropane pipeline connected to the proportioner, characterized in that, The heptafluoropropane pipeline is sequentially equipped with a pressure reducing valve, a control valve, and a regulating valve. The regulating valve is connected to the proportioning mixer, and the pressure reducing valve is connected to the heptafluoropropane pipeline network. The regulating valve includes a valve body, a valve cover disposed on the valve body, a positioning sleeve embedded between the valve body and the valve cover, and an elastic valve stem assembly installed between the valve cover and the positioning sleeve and extending into the valve body. The valve body includes a first pipe and a second pipe disposed on the first pipe, one end of the first pipe being connected to the control valve and the other end being connected to the proportional mixer; The second tube is provided with a baffle, and a pressure tapping chamber is formed between the baffle and the positioning sleeve. A first pressure tapping port is provided on the side wall of the pressure tapping chamber. A second pressure tapping port is provided on the end of the proportioning mixer near the foam mixture pipeline. The second pressure tapping port and the first pressure tapping port are connected through a pressure tapping tube. The first tube is provided with a symmetrical liquid passage window. The bottom of the elastic valve stem assembly passes through the partition and extends into the first tube. When the pressure in the foam mixture pipeline changes, the pressure in the pressure tapping chamber acts directly on the elastic valve stem assembly, causing the elastic valve stem assembly to rise or fall, so that the liquid passage window opens or closes accordingly.

2. The heptafluoropropane foam fire extinguishing system according to claim 1, characterized in that, The cross-section of the liquid-passing window is inverted I-shape and is located in the lower middle part of the first tube.

3. The heptafluoropropane foam fire extinguishing system according to claim 2, characterized in that, The liquid-passing window includes a first window at the top, a second window at the bottom, and a vertical window connecting the first window and the second window; The first window has an inverted trapezoidal structure, and the second window has an arc-shaped structure.

4. The heptafluoropropane foam fire extinguishing system according to claim 3, characterized in that, The side of the inverted trapezoidal structure is arc-shaped, and the circle containing the arc is concentric with the circle containing the inner wall of the first tube.

5. The heptafluoropropane foam fire extinguishing system according to claim 3, characterized in that, The chord length in the bow-shaped structure is less than the pipe radius of the first pipe.

6. The heptafluoropropane foam fire extinguishing system according to claim 1, characterized in that, The elastic valve stem assembly includes a valve core located on the positioning sleeve. The top end of the valve core is kept concentric with the valve cover by an adjusting stud, and a valve disc is provided at the bottom end. The valve disc is located in the first tube. The valve core is fitted with an upper positioning ring, a spring, and a lower positioning ring. The upper positioning ring contacts the adjusting stud, and the lower positioning ring contacts the convex ring on the valve core. The positioning sleeve limits the movement of the convex ring.

7. The heptafluoropropane foam fire extinguishing system according to claim 6, characterized in that, The valve disc includes a cylindrical ring and a top cover disposed on the cylindrical ring. The top cover is connected to the valve core, and the outer wall of the cylindrical ring is in contact with the liquid passage window.

8. The heptafluoropropane foam fire extinguishing system according to claim 7, characterized in that, The height of the cylindrical ring is greater than the radius of the first tube but less than the diameter of the first tube.

9. The heptafluoropropane foam fire extinguishing system according to claim 7, characterized in that, The top cover has a through hole.

10. The heptafluoropropane foam fire extinguishing system according to claim 6, characterized in that, A lower sealing ring is provided between the side wall of the valve core and the partition plate, and an upper sealing ring is provided between the side wall of the valve core and the positioning sleeve.

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