CN203891126U - Two-stage pressure regulating device for fire hydrant - Google Patents

Abstract

The utility model discloses a two-stage pressure regulating device for a fire hydrant, which mainly consists of a copper body ring, a sealing ring I, a sealing pad I, a cylindrical head screw, a sealing pad seat, a clamping plate, a spring washer, a hexagon head nut, and a sealing pad II , sealing ring II, pressure plate and piston; by controlling the axial displacement of the piston, the two-stage pressure regulating device inside the fire hydrant can be opened in stages under the action of water pressure. First, part of the water flows from the plug body into the fire hydrant connecting pipe through the piston; After moving for a certain distance, the pressure water in the plug body can directly flow into the connecting pipe of the fire hydrant from the annular gap between the gasket I and the copper body ring, so as to achieve the purpose of two-stage pressure regulation. The two-stage pressure regulating device is flexible in operation, simple and reliable, can effectively realize two-stage pressure regulation, and is especially suitable for high-pressure water flow fire extinguishing occasions.

Description

A two-stage pressure regulating device for a fire hydrant

technical field

The utility model relates to a fire hydrant, in particular to a two-stage pressure regulating device for the fire hydrant.

Background technique

Fire hydrants are the most common sprinkler fire extinguishing equipment. They are cheap in cost, easy to maintain, and very effective in controlling and extinguishing fires at the initial stage, so they have been widely used in the process of extinguishing fires.

The pressure of the fire hydrants commonly used at present cannot be adjusted generally during use, and overpressure accidents are prone to occur during use. In occasions where the water flow requirement is small, too high pressure will result in loss of water flow, and the fire-fighting water may be used up in a relatively short period of time, which is extremely unfavorable for fighting an initial fire. Moreover, after one water outlet of a traditional fire hydrant is put into use, it will be difficult to connect the water belt to the second water outlet due to excessive pressure, thereby affecting fire fighting and rescue.

Contents of the invention

In order to overcome the problems of the fire hydrants in the background technology and meet the practical requirements of fire fighting, the utility model provides a two-stage pressure regulating device for fire hydrants. The pressure regulating device can realize two-stage pressure regulation by controlling the axial displacement of the piston; under the action of water pressure, the pressure regulating device inside the fire hydrant can be opened in stages. First, a part of the water flows from the plug body into the connecting pipe of the fire hydrant through the piston; after the piston moves After a certain distance, the pressure water in the plug body can directly flow into the connecting pipe of the fire hydrant from the annular gap between the gasket I and the copper body ring, so as to achieve the purpose of two-stage pressure regulation. The pressure regulating device is flexible in operation, simple and reliable, and can effectively realize two-stage pressure regulation.

The technical scheme adopted by the utility model to solve its technical problems includes: copper body ring, sealing ring I, sealing pad I, cylindrical head screw, sealing cushion seat, clamping plate, spring washer, hexagon head nut, sealing pad II, sealing ring Ⅱ. Pressure plate and piston; the copper body ring is provided with external threads, which can be directly connected with the fire hydrant body; a sealing ring Ⅰ is provided between the copper body ring and the fire hydrant body, which can effectively prevent the pressure water from escaping; the sealing gasket Ⅰ is tight The pressure plate is close to the gasket Ⅰ; the pressure plate and the gasket seat are transitionally fitted; the pressure plate, the gasket Ⅰ and the gasket seat are fixedly connected together by cylindrical head screws; the piston is covered with a gasket seat , the gap fit between the two; there is a sealing ring II between the piston and the gasket seat; the piston can move along the axial direction of the gasket seat; the end face of the clamp is close to the gasket seat, and there is a Sealing gasket II; one end of the spring washer is close to the clamping plate, and the other end is close to the hexagon nut; the sealing gasket II, clamping plate and spring washer are fixedly connected to the end of the piston through the hexagonal nut.

Compared with the background technology, the utility model has the beneficial effects that: under the action of water pressure, the pressure regulating structure inside the fire hydrant can be opened in stages; first, a part of the water flows into the connecting pipe of the fire hydrant from the plug body through the piston; after the piston moves a certain distance , the pressure water in the hydrant body can flow directly into the fire hydrant connecting pipe from the annular gap between the gasket I and the copper body ring. In this way, the two-stage pressure regulation of the fire hydrant can be realized by controlling the axial displacement of the piston.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a top view of the end face of the utility model piston.

Fig. 3 is the front view of the utility model piston.

Fig. 4 is a schematic diagram of the principle of one-stage pressure opening of the utility model.

Fig. 5 is a schematic diagram of the principle of the secondary pressure opening of the utility model.

Fig. 6 is a schematic diagram of installation of the utility model in a fire hydrant.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

As shown in Figure 1, Figure 2, Figure 3, Figure 4, Figure 5 and Figure 6, the utility model includes a copper body ring 1, a sealing ring I2, a sealing gasket I3, a cylinder head screw 4, a sealing pad seat 5, and a clamping plate 6. Spring washer 7, hexagon head nut 8, gasket II 9, seal ring II 10, pressure plate 11 and piston 12. The copper body ring 1 is provided with an external thread, which can be directly threaded with the fire hydrant body. A sealing ring I2 is provided between the copper body ring 1 and the fire hydrant body, which can effectively prevent pressure water from escaping. The gasket I3 is close to the gasket seat 5, and the two are transitionally fitted. The pressure plate 11 is close to the gasket I3; the pressure plate 11 is transitionally fitted with the gasket seat 5; The piston 12 is covered with a gasket seat 5, and the two are in clearance fit; a sealing ring II 10 is arranged between the piston 12 and the gasket seat 5; the piston 12 can move along the axial direction of the gasket seat 5. The end face of the clamp plate 6 is close to the gasket seat 5, and the gasket II9 is arranged between the clamp plate 6 and the gasket seat 5; one end of the spring washer 7 is close to the clamp plate 6, and the other end is close to the hex nut 8; the gasket II9, The clamping plate 6 and the spring washer 7 are fixedly connected to the end of the piston 12 through the hex nut 8 .

The working principle of the utility model is as follows:

The fire hydrant needs to be opened in time when the on-site fire is extinguished. As shown in FIGS. 1 and 6 , the piston 12 moves axially downward under the action of the guide valve rod 13 , while the gasket seat 5 sheathed on the outside of the piston 12 does not move under the water pressure in the plug body 14 . The side of the piston 12 is designed with a water inlet A as shown in Figure 3. At this time, water enters the interior of the piston 12 from the water inlet A on the side of the piston 12, and flows into the fire hydrant connecting pipe from the water outlet B on the top surface of the piston 12. This is the fire hydrant The primary pressure opening stage (as shown in Figure 4). Piston 12 water inlet exposes the area size of gasket seat 15 and plays the effect of one-stage pressure regulation, and the pressure in the fire hydrant that the area that exposes is big then is big. The primary pressure opening of the fire hydrant is the secondary pressure opening of the fire hydrant gasket I3, which reduces the pressure difference between the inlet and outlet of the system.

When the shaft shoulder of the piston 12 is stuck on the upper end surface of the gasket seat 5, the piston 12 can drive the gasket seat 5 to move axially downward, and the gasket I3 leaves the copper body ring 1. At this time, the pressure water enters the fire hydrant connection from the inside of the piston. Outside the pipe, it can also directly enter the fire hydrant through the annular gap between the gasket I3 and the copper body ring 1. At this time, it is the secondary pressure opening stage of the fire hydrant (as shown in Figure 5). As the axial distance between gasket I3 and copper body ring 1 increases, the water pressure in the connecting pipe of the fire hydrant also gradually increases.

It can be seen from the above that by rotating the opening and closing valve stem of the fire hydrant and controlling the axial movement distance of the piston 12 under the action of the guide valve stem 13, the purpose of two-stage pressure regulation can be achieved, and it can be conveniently adjusted according to the needs of the fire extinguishing scene. Adjust the water pressure in the fire hydrant in time.

Claims (1)

1. A two-stage pressure regulating device for a fire hydrant, mainly including a copper body ring (1), a sealing ring I (2), a sealing gasket I (3), a cylindrical head screw (4), a sealing gasket seat (5), a clip Plate (6), spring washer (7), hexagon head nut (8), sealing gasket II (9), sealing ring II (10), pressure plate (11) and piston (12); it is characterized in that: copper body ring ( 1) It is equipped with external threads, which can be directly threaded with the fire hydrant body; there is a sealing ring I (2) between the copper body ring (1) and the fire hydrant body, which can effectively prevent the pressure water from escaping; the sealing gasket I (3 ) is close to the gasket seat (5), and the two are transitionally fit; the pressure plate (11) is close to the gasket I (3); the pressure plate (11) is transitionally fitted with the gasket seat (5); the pressure plate (11), the gasket I (3) and the gasket seat (5) are fixedly connected together by cylindrical head screws (4); the piston (12) is covered with the gasket seat (5), and the two are in clearance fit; the piston (12) and the gasket seat ( 5) is equipped with a sealing ring II (10); the end face of the card plate (6) is close to the gasket seat (5), and the gasket II (9) is arranged between the card plate (6) and the gasket seat (5) ; One end of the spring washer (7) is close to the clamp (6), and the other end is close to the hex nut (8); the gasket II (9), the clamp (6) and the spring washer (7) pass through the hex nut (8) ) is fixedly connected to the end of the piston (12).