Normally open type bottom discharging valve of fire-fighting pipeline

Abstract

The utility model relates to the technical field of normally-open bottom discharging valves, and particularly discloses a fire-fighting pipeline normally-open bottom discharging valve which comprises a shell, a valve plug capable of translating in the axial direction of the shell is arranged in the shell, and the shell comprises a cylinder with two open ends on the whole. An annular plate is radially and inwards arranged at the right side end part of the cylinder; a hollow circular-truncated-cone-shaped shell is fixedly arranged on the inner wall of the annular plate; the large-diameter end of the hollow circular-truncated-cone-shaped shell is connected with a circular ring plate The hollow circular truncated cone-shaped shell is arranged on the inner side of the cylinder; the outer diameter of the valve plug is larger than the inner diameter of the small-diameter end of the hollow circular-truncated-cone-shaped shell. A gap is formed between the outer wall of the valve plug and the inner wall of the cylinder. The whole valve plug is cylindrical, and a circular-truncated-cone-shaped groove is inwards formed in the end of one side of the valve plug. Compared with the prior art, normally-open in a non-operation state is effectively achieved, and accumulated water caused by internal seepage or condensation of a fire extinguishing system valve is discharged in time; in a full-water operation state, closing is automatically kept, and the emergency requirement is met.

Description

Technical Field

[0001] This utility model relates to the technical field of normally open bottom drain valves, and specifically discloses a normally open bottom drain valve for fire pipelines. Background Technology

[0002] As the last line of defense for ensuring on-site production safety during dock operations, the fire protection system must be kept in a fully water-filled standby state at all times. In a fire protection system, the terminal main pipe section usually refers to the last section of the main pipeline in the water supply system. This part of the pipeline may be directly connected to fire hydrants, sprinklers, or other fire protection equipment.

[0003] As is well known, various types of control valves in fire protection systems generally have internal leakage defects. In addition, condensate easily accumulates on the inner wall of the pipe, resulting in water accumulation in the main pipe section at the end of the pipeline. Furthermore, in winter, when the temperature is below zero for a long time, the accumulated water is prone to freezing if it is not drained in time, which often leads to valve freezing and cracking.

[0004] To prevent valves from freezing and cracking and ensure the timely availability of the fire protection system, the following measures are commonly adopted: First, insulation measures such as electric heating and thermal insulation cotton are added to the terminal sections of the fire protection pipeline, but this increases costs. Second, personnel are assigned to periodically and manually open the bottom drain valve to release water to prevent equipment damage. By periodically draining accumulated water, the bottom drain valve helps maintain the reliability and stability of the fire protection system. This ensures that the fire protection system can quickly and effectively provide the necessary fire-fighting water source in emergencies. However, the valve must be closed promptly after draining to prepare for emergencies, which increases labor and wastes manpower. Utility Model Content

[0005] To address the aforementioned shortcomings of existing technologies, this utility model provides a normally open bottom drain valve for fire pipelines, which solves the problems of increased costs caused by installing insulation devices on pipelines to prevent valve freezing and cracking, as well as increased labor intensity caused by frequent manual valve opening and closing.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A normally open bottom drain valve for fire protection pipelines includes a housing with a valve plug capable of axial translation within the housing. The housing comprises a cylindrical section open at both ends. A circular annular plate is radially inwardly positioned at the right end of the cylinder. A hollow frustum-shaped shell is fixedly mounted on the inner wall of the circular annular plate. The large-diameter end of the hollow frustum-shaped shell is connected to the circular annular plate. The hollow frustum-shaped shell is located inside the cylinder. The outer diameter of the valve plug is larger than the inner diameter of the small-diameter end of the hollow frustum-shaped shell, and a gap is provided between the outer wall of the valve plug and the inner wall of the cylinder. The valve plug is cylindrical in shape, and a frustum-shaped groove is formed inwardly on one end of the valve plug. When the fire protection system's terminal main pipe section is not in operation, accumulated water can flow through the gap between the outer wall of the valve plug and the inner wall of the cylinder, and drain out through the small-diameter end of the hollow frustum-shaped shell. When the system is in full-water operation, the water pressure presses the valve plug tightly against the small-diameter end of the hollow frustum-shaped shell, keeping the normally open bottom drain valve closed, thus meeting emergency requirements.

[0008] Preferably, a spring is provided between the valve plug and the small-diameter end of the hollow frustum-shaped housing. When the terminal main pipe section of the fire protection system is not in operation, the spring force pushes the valve plug away from the small-diameter end of the hollow frustum-shaped housing, so that the normally open drain valve of the fire protection pipeline is in the open state, so as to drain the water accumulated due to internal seepage or condensation in a timely manner.

[0009] Preferably, a cylinder is fixedly mounted on the small-diameter end of the hollow frustum-shaped housing via a connecting rod; the outer diameter of the cylinder is smaller than the inner diameter of the small-diameter end of the hollow frustum-shaped housing. The cylinder ensures smooth movement of the valve plug along the axial direction of the housing, guaranteeing smooth opening and closing.

[0010] Preferably, the valve plug has a through hole; the cylinder is disposed within the through hole. This completes the installation of the valve plug on the cylinder.

[0011] Preferably, the through-hole of the valve plug has a transition fit with the cylinder. This ensures a tight seal and reduces leakage when the valve is full of water. Furthermore, the friction between the two is less than the water pressure in the terminal main pipe section of the fire protection system during operation.

[0012] Preferably, a disc is threaded onto the end of the cylinder after it extends beyond the valve plug; the outer diameter of the disc is smaller than the outer diameter of the valve plug. When the terminal main pipe section of the fire protection system is not in operation and there is a large amount of water accumulation, the pressure on the valve plug is reduced to prevent the valve plug from sticking to the inner wall of the housing and the small-diameter end of the hollow frustum-shaped housing, thus preventing the water from being discharged in time.

[0013] Preferably, the disc has several perforations evenly distributed along its circumference. When the fire protection system's terminal main pipe section is in operation, this reduces the disc's obstruction of water flow, ensuring the valve plug moves under water pressure and closes the normally open drain valve of the fire protection pipeline.

[0014] Preferably, the inner wall of the end of the housing away from the hollow frustum-shaped housing is provided with threads. This facilitates connection with pipelines.

[0015] The beneficial effects of this invention are as follows: When the terminal main pipe section of the fire protection system is not in operation, accumulated water can flow through the gap between the outer wall of the valve plug and the inner wall of the cylinder, and be discharged through the small-diameter end of the hollow frustum-shaped shell. When the system is in full-water operation, the water pressure presses the valve plug tightly against the small-diameter end of the hollow frustum-shaped shell, and the normally open drain valve of the fire protection pipeline is in the closed state, meeting emergency requirements. This avoids the increased cost caused by pipeline insulation and reduces the workload of frequently opening and closing valves. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0018] Figure 2 This is a partial cross-sectional view of the present invention. Figure 1 ;

[0019] Figure 3 This is a partial cross-sectional view of the present invention. Figure 2 .

[0020] Explanation of reference numerals in the attached figures:

[0021] 1-Housing shell, 2-Valve plug, 3-Spring, 4-Connecting rod, 5-Cylinder, 6-Disc; 101-Cylinder, 102-Annular plate, 103-Hollow frustum-shaped housing. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0023] Example 1

[0024] like Figure 1-3As shown, a normally open bottom drain valve for fire pipelines includes a housing 1, and a valve plug 2 that can translate along the axial direction of the housing 1 is provided inside the housing 1. The housing 1 includes a cylindrical body 101 that is open at both ends. A circular ring plate 102 is provided radially inward at the right end of the cylindrical body 101. A hollow frustum-shaped housing 103 is fixedly provided on the inner wall of the circular ring plate 102. The large-diameter end of the hollow frustum-shaped housing 103 is connected to the circular ring plate 102. The hollow frustum-shaped housing 103 is located inside the cylindrical body 101. The outer diameter of the valve plug 2 is larger than the inner diameter of the small-diameter end of the hollow frustum-shaped housing 103, and a gap is provided between the outer wall of the valve plug 2 and the inner wall of the cylindrical body 101. The valve plug 2 is cylindrical in shape, and a frustum-shaped groove is provided inward at one end of the valve plug 2. When the fire protection system's terminal main pipe section is not in operation, accumulated water can flow through the gap between the outer wall of valve plug 2 and the inner wall of cylinder 101, and be discharged through the small-diameter end of the hollow frustum-shaped shell 103. During full-water operation, water pressure presses valve plug 2 tightly against the small-diameter end of the hollow frustum-shaped shell 103, keeping the normally open bottom drain valve of the fire protection pipeline closed, thus meeting emergency requirements. The inner wall of the end of shell 1 furthest from the hollow frustum-shaped shell 103 is threaded for easy connection to pipelines.

[0025] Example 2

[0026] Based on Embodiment 1, a spring 3 is provided between the valve plug 2 and the small-diameter end of the hollow frustum-shaped housing 103. One end of the spring 3 is fixedly connected to the small-diameter end of the hollow frustum-shaped housing 103, and the other end abuts against the valve plug 2. When the terminal main pipe section of the fire protection system is not in operation, the spring force of the spring 3 pushes the valve plug 2 away from the small-diameter end of the hollow frustum-shaped housing 103, so that the normally open drain valve of the fire protection pipeline is in the open state, so as to drain the water accumulated due to internal seepage or condensation in a timely manner.

[0027] Example 3

[0028] Based on Embodiment 2, a cylinder 5 is fixedly mounted on the small-diameter end of the hollow frustum-shaped shell 103 via a connecting rod 4; the outer diameter of the cylinder 5 is smaller than the inner diameter of the small-diameter end of the hollow frustum-shaped shell 103. A through hole is provided on the valve plug 2; the cylinder 5 is positioned within the through hole, completing the mounting of the valve plug 2 on the cylinder 5. The cylinder 5 ensures smooth movement of the valve plug 2 along the axis of the shell 1, guaranteeing smooth opening and closing. A transition fit between the through hole of the valve plug 2 and the cylinder 5 ensures sealing and reduces water leakage when the system is full. Furthermore, the friction between the two is less than the water pressure in the terminal main pipe section of the fire protection system during operation, ensuring that the valve plug can be pressed tightly against the small-diameter end of the hollow frustum-shaped shell 103 under water pressure, and completely sealing the gap between the hollow frustum-shaped shell 103 and the cylinder 101. The valve plug 2 is made of rubber.

[0029] Example 4

[0030] Based on embodiment 3, a disc 6 is threaded onto the end of the cylinder 5 after the valve plug 2 extends outward; the outer diameter of the disc 6 is smaller than the outer diameter of the valve plug 2. Six drainage holes are evenly arranged along the circumference of the disc 6. When the fire protection system's terminal main pipe section is not in operation and there is a large amount of water accumulation, the pressure on the valve plug 2 is reduced to prevent the valve plug 2 from sticking to the inner wall of the housing 1 and the small-diameter end of the hollow frustum-shaped housing 103, thus preventing the water from being discharged in time. When the fire protection system's terminal main pipe section is in operation, the obstruction of the water flow by the disc 6 is reduced to ensure that the valve plug 2 moves under water pressure and closes the normally open bottom drain valve of the fire protection pipeline.

[0031] By using this normally open bottom drain valve for fire protection pipelines, it effectively ensures that the system remains open during non-operational periods to promptly drain water accumulated due to internal seepage or condensation in the fire protection system valves; it also automatically closes during full-water operation to meet emergency requirements. This avoids increased costs associated with pipeline insulation and reduces the workload of frequently opening and closing valves.

[0032] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, it is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope of the claims.

Claims

1. A fire protection line normally open drain valve comprising a housing (1) in which is disposed a valve plug (2) that is axially translatable along the housing (1), characterized in that, The shell (1) comprises a cylinder (101) with both ends open; a circular plate (102) is arranged radially inward at the right end of the cylinder (101); a hollow circular truncated cone shell (103) is fixedly arranged on the inner wall of the circular plate (102); the large-diameter end of the hollow circular truncated cone shell (103) is connected with the circular plate (102); the hollow circular truncated cone shell (103) is arranged inside the cylinder (101); the outer diameter of the valve plug (2) is greater than the inner diameter of the small-diameter end of the hollow circular truncated cone shell (103), and a gap is arranged between the outer wall of the valve plug (2) and the inner wall of the cylinder (101); the valve plug (2) is arranged in a cylindrical shape as a whole, and a circular truncated cone groove is formed inward at one side end of the valve plug (2).

2. The normally open drain valve for fire service lines of claim 1, wherein, A spring (3) is arranged between the valve plug (2) and the small-diameter end of the hollow circular truncated cone shell (103).

3. The normally open drain valve for fire service lines of claim 2, wherein, The small-diameter end of the hollow circular truncated cone shell (103) is fixedly provided with a cylinder (5) through a connecting rod (4); the outer diameter of the cylinder (5) is smaller than the inner diameter of the small-diameter end of the hollow circular truncated cone shell (103).

4. The normally open drain valve for fire protection lines according to claim 3, characterized in that, A through hole is arranged on the valve plug (2); the cylinder (5) is arranged in the through hole.

5. The normally open drain valve for fire protection lines according to claim 4, characterized in that, The through hole of the valve plug (2) and the cylinder (5) are in transition fit.

6. The normally open drain valve for fire protection lines of claim 5, wherein, A disc (6) is threadedly arranged at the end of the cylinder (5) extending out of the valve plug (2); the outer diameter of the disc (6) is smaller than the outer diameter of the valve plug (2).

7. The normally open drain valve for fire protection lines according to claim 6, characterized in that, A plurality of leakage holes are uniformly arranged on the disc (6) in the circumferential direction.

8. The normally open drain valve for fire protection lines of claim 1, wherein, A thread is arranged on the inner wall of the end of the shell (1) away from the hollow circular truncated cone shell (103).

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