Improved secondary valve fire hydrant

Abstract

The utility model discloses an improved secondary valve fire hydrant which comprises a valve body, a mounting valve core, a valve rod and a valve cover, the valve core is connected with the valve rod, and the valve rod is connected with a screw rod in the valve cover; the cage sleeve is mounted in the hole of the valve body and sleeves the periphery of the valve rod to protect and guide the movement of the valve core; the bushing is mounted in the hole of the valve body and sleeves the periphery of the valve core; the hand wheel is connected with the screw rod for manually operating the switch valve; a valve core throttling part of the valve core is provided with an arc surface, the cross section of the valve core throttling part is fan-shaped, and a horizontal part of the valve core is in arc transition with the arc surface; the valve body is provided with an inlet and an outlet, and the length of the valve rod is aligned with that of the outlet. According to the two-stage valve fire hydrant, through optimization design, the fluid flowing characteristic, the adjusting performance, the operation efficiency and the sealing performance are improved, the two-stage valve fire hydrant is suitable for occasions where flow needs to be accurately controlled and operation is stable, and the performance and reliability of the valve are improved.

Description

Technical Field

[0001] The utility model relates to a fire hydrant, in particular to an improved two-stage valve fire hydrant. Background Art

[0002] Fire hydrants are devices used for firefighting and rescue operations, connecting to a fire water source to provide firefighters with water for firefighting. In some fire hydrant systems, the use of a two-stage throttle valve is common. This valve limits the flow rate of the hydrant, making it more flexible to use while effectively controlling water pressure to ensure an adequate supply of fire water. Research has shown that two-stage throttle valves are commonly used in fire hydrants, such as the combined two-stage throttle valve with application number CN201120090305.8. This throttle valve primarily consists of a valve body, bushing, cage, wedge-shaped valve core, plunger, valve stem, and valve cover. The fluid in the upstream valve hole is throttled by the cage plunger to achieve primary throttling, and then the fluid entering the cage is throttled by the wedge-shaped valve core and the bushing to achieve secondary throttling; however, the wedge surface of the valve core is flat, and the fluid will encounter more obvious resistance when passing through the valve body, the flow rate will be slowed down, the fluid flow will produce a large resistance loss, and the flow rate is relatively unstable; at the same time, the length of the plunger in the above patent is much greater than the length of the outlet, which causes the valve stem rotation period to be lengthened, which is not conducive to supporting time-sensitive firefighting and rescue activities. Utility Model Content

[0003] In order to solve the deficiencies existing in the above technologies, the utility model provides an improved two-stage valve fire hydrant.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is an improved two-stage valve fire hydrant, comprising:

[0005] The valve body is installed with the valve core, valve stem and valve cover. The valve core is connected to the valve stem, and the valve stem is connected to the screw in the valve cover;

[0006] The cage is installed in the hole of the valve body and is placed around the valve stem to protect and guide the movement of the valve core;

[0007] The bushing is installed in the hole of the valve body and is placed around the valve core;

[0008] Handwheel, connected to the screw rod to manually operate the valve;

[0009] The throttling portion of the valve core has an arc surface, the cross section of the throttling portion of the valve core is fan-shaped, and the horizontal portion of the valve core transitions to the arc surface in an arc shape;

[0010] The valve body is provided with an inlet and an outlet, and the length of the valve stem is aligned with the length of the outlet.

[0011] Furthermore, a screw nut is disposed on the outer sleeve of the screw rod and is connected to the valve cover via the screw nut, and a valve cap is disposed on the outer sleeve of the screw nut.

[0012] Furthermore, it also includes a packing pad and packing sleeved on the valve stem. The packing pad is installed at the connection between the valve cover and the valve body; the packing is installed between the cage sleeve and the packing pad.

[0013] Furthermore, the valve cover and the valve body are connected via a hexagonal nut.

[0014] Furthermore, the diameter of the valve core is smaller than the diameter of the valve stem, and the upper end of the bushing is sleeved on the lower end of the cage.

[0015] The utility model discloses an improved two-stage valve fire hydrant, which has several advantages in design:

[0016] Optimizing fluid flow characteristics: By changing the valve core wedge surface to a curved surface design, the resistance of the fluid passing through the valve body can be reduced, allowing the fluid to pass through the valve more smoothly, reducing flow resistance and increasing flow rate stability, thereby improving fluid flow regulation performance. Improving the valve core wedge surface with a curved surface design enables the valve to regulate flow more smoothly, respond more sensitively, and achieve more precise fluid control. This design reduces pressure concentration on the valve core, facilitates stable valve operation, reduces leakage and wear, and improves valve control accuracy.

[0017] Fast operation: By adjusting the valve stem length, the valve stem rotation cycle is shortened. Firefighters can control the water flow more quickly in an emergency, open or close the valve, speed up the deployment of fire hoses, effectively control the fire, and reduce the damage caused by the fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0019] Figure 2 A cross-sectional view of the valve core and valve stem.

[0020] Figure 3 It is a three-dimensional diagram of the valve core and valve stem.

[0021] In the figure: 100, valve body; 200, valve core; 300, valve stem; 400, valve cover; 500, screw; 600, cage; 700, bushing; 800, handwheel; 900, hexagonal nut; 210, valve core throttling part; 211, arc surface; 220, horizontal part; 303, packing pad; 304, packing; 501, screw nut; 502, valve bonnet. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0023] like Figure 1 The improved two-stage valve fire hydrant shown in the figure includes a valve body 100, which is the main part of the valve and houses the valve core and other related components. It also connects to the pipeline. The valve body 100 has an inlet 101 and an outlet 102. Inside, a valve core 200, a valve stem 300, and a valve cover 400 are installed. The valve core 200 is connected to the valve stem 300, which in turn is connected to a screw 500 inside the valve cover 400. The valve core is a key component of the valve, responsible for controlling the flow of the medium. It is connected to the valve stem and moves to open or close the valve. The valve stem is the component that connects the screw inside the valve cover and the valve core, transmitting the force for manual or automatic operation to control the opening and closing of the valve. The valve cover is mounted on the top of the valve body to secure the valve assembly and provide a seal. The screw 500 is covered with a screw nut 501 and is connected to the valve cover 400 through rotation of the screw nut 501. The screw nut 501 is covered with a valve cap 502. Hand wheel 800, connected to screw rod 500 for manually operating the valve;

[0024] The cage 600 is installed in the hole of the valve body 100 and is placed around the valve stem 300 to protect and guide the movement of the valve core 200; the bushing 700 is installed in the hole of the valve body 100 and is placed around the valve core 200; Figure 2 and Figure 3 The valve core throttle portion 210 of the illustrated valve core has a curved surface 211. The cross-section of the valve core throttle portion 210 is fan-shaped, and the horizontal portion 220 of the valve core 200 forms an arc-shaped transition with the curved surface 211. The diameter of the valve core 200 is smaller than the diameter of the valve stem 300, and the upper end of the bushing 700 is nested within the lower end of the cage 600. In this patent, the valve core wedge surface is switched from a flat surface to a curved surface, which brings the following advantages, as compared below:

[0025] Improved fluid flow characteristics: When the valve core wedge surface is flat, the fluid will encounter significant resistance when passing through the valve body, the flow rate will be slowed down, and the fluid flow will produce greater resistance loss. When the valve core wedge surface is curved, the resistance is reduced and the fluid can pass through the valve body more smoothly, reducing flow resistance and making the flow rate relatively more stable.

[0026] Strong Adjustment Performance: A cambered wedge surface allows for smoother flow regulation, more responsiveness, and more precise fluid control. This cambered surface evenly distributes fluid force, preventing excessive pressure concentration on the wedge surface. This reduces fluid impact and vibration, fostering stable valve operation, minimizing leakage and wear, and improving valve control accuracy. In contrast, a flat wedge surface limits adjustment performance.

[0027] Aligning the length of valve stem 300 with the length of outlet 102 effectively reduces the length of valve stem 300, shortening the valve stem's rotation cycle. When the valve stem's length is aligned with the outlet's length, the distance required for the valve stem to complete one rotation matches the outlet's length. Reducing the length of the valve stem, or the distance it takes to complete one rotation, reduces the time required for the valve stem to complete one rotation, thereby shortening the valve stem's rotation cycle. In an emergency, shortening the valve stem's rotation cycle means firefighters can more quickly control the water flow and open or close the valve, enabling faster deployment of fire hoses, controlling the fire, and reducing fire damage.

[0028] The valve stem 300 also includes a packing washer 303 and packing 304. The packing washer 303 is installed at the connection between the valve cover 400 and the valve body 100, and the packing 304 is installed between the cage 600 and the packing washer 303. The packing washer 303 and packing 304 play a role in sealing, reducing friction, and bearing pressure in the valve. They are important components for ensuring the normal operation of the valve and preventing leakage, ensuring the sealing performance and operating stability of the valve.

[0029] The valve cover 400 and the valve body 100 are connected by a hexagonal nut 900 and fixed in position by a threaded connection.

[0030] During operation, the valve core 200 of the improved two-stage fire hydrant valve controls the opening and closing of the valve through its connection with the valve stem 300. When the valve stem 300 rotates, the valve core 200 moves accordingly, changing the opening of the valve core's throttle section 210, thereby controlling the flow of the medium. The handwheel 800, connected to the screw 500, is used to manually operate the valve. When the handwheel 800 rotates, the screw 500 moves up or down, connecting with the screw nut 501 inside the valve cover 400, thereby transmitting force to the valve stem 300, causing the valve core 200 to move. The cage 600 is installed in the hole of the valve body 100 and fits around the valve stem 300, protecting and guiding the movement of the valve core 200. The bushing 700 is installed in the hole of the valve body 100 and fits around the valve core 200, reducing friction between the valve core 200 and the valve body 100 and providing a seal. The packing washer 303 is installed at the junction between the bonnet 400 and the valve body 100. The packing 304 is installed between the cage 600 and the packing washer 303. These seals, reduce friction, and provide pressure resistance, ensuring proper valve operation and preventing media leakage. The bonnet 400 is connected to the valve body 100 via a hexagonal nut 900, which is secured in place by a threaded connection. The installation of the bonnet 400 secures the various valve components and provides a seal.

[0031] In summary, manually operating handwheel 800 and rotating screw 500 transmits force to valve stem 300, moving valve core 200 and thus opening and closing the valve. Simultaneously, components such as cage 600, bushing 700, packing 303, and packing 304 provide protection, sealing, and friction reduction, ensuring proper valve operation.

[0032] The improved two-stage valve fire hydrant of the utility model has several advantages in design:

[0033] Optimization of fluid flow characteristics: By changing the valve core wedge surface to a curved surface design, the resistance of the fluid through the valve body can be reduced, allowing the fluid to pass through the valve more smoothly, reducing flow resistance, and increasing flow rate stability, thereby improving the flow characteristics of the fluid.

[0034] Improved Regulation Performance: The cambered wedge surface of the valve core allows the valve to regulate flow more smoothly, respond more sensitively, and control fluids more precisely. This design reduces pressure concentration on the valve core, facilitating stable operation, reducing leakage and wear, and improving valve control accuracy.

[0035] Fast operation: By adjusting the valve stem length, the valve stem rotation cycle is shortened. Firefighters can control the water flow more quickly in an emergency, open or close the valve, speed up the deployment of fire hoses, effectively control the fire, and reduce the damage caused by the fire.

[0036] The above-mentioned implementation manner is not a limitation of the present invention, and the present invention is not limited to the above-mentioned examples. Any changes, modifications, additions or substitutions made by technicians in this technical field within the scope of the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. An improved two-stage valve fire hydrant, characterized in that: include: The valve body (100) is provided with a valve core (200), a valve stem (300) and a valve cover (400), wherein the valve core (200) is connected to the valve stem (300), and the valve stem (300) is connected to a screw (500) in the valve cover (400); A cage (600) is installed in the hole of the valve body (100) and is placed around the valve stem (300) to protect and guide the movement of the valve core (200); A bushing (700) is installed in the hole of the valve body (100) and is sleeved around the valve core (200); A hand wheel (800) connected to the screw (500) for manually operating the valve; The valve core throttling portion (210) of the valve core (200) has an arc surface (211), the cross section of the valve core throttling portion (210) is fan-shaped, and the horizontal portion (220) of the valve core (200) transitions to the arc surface (211) in an arc shape; The valve body (100) is provided with an inlet (101) and an outlet (102), and the length of the valve stem (300) is aligned with the length of the outlet (102).

2. The improved two-stage valve fire hydrant according to claim 1, characterized in that: The screw (500) is covered with a screw nut (501) and is connected to the valve cover (400) via the screw nut (501). The screw nut (501) is covered with a valve cap (502).

3. The improved two-stage valve fire hydrant according to claim 2, characterized in that: It also includes a packing pad (303) and a packing (304) sleeved on the valve stem (300), wherein the packing pad (303) is installed at the connection between the valve cover (400) and the valve body (100); and the packing (304) is installed between the cage (600) and the packing pad (303).

4. The improved two-stage valve fire hydrant according to claim 3, characterized in that: The valve cover (400) and the valve body (100) are connected via a hexagonal nut (900).

5. The improved two-stage valve fire hydrant according to claim 4, characterized in that: The diameter of the valve core (200) is smaller than the diameter of the valve stem (300), and the upper end of the bushing (700) is sleeved on the lower end of the cage (600).

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