Water escape valve of fire-fighting water crane

Abstract

The utility model relates to the technical field of fire fighting, in particular to a fire-fighting water crane water escape valve which comprises a valve body and a pressing plate which is detachably arranged on the bottom face of the valve body and used for sealing the bottom of the valve body, a penetrating water drainage opening is formed in the pressing plate, and a pressing cover is arranged at the top of the valve body. A lead screw which is connected with an inner cavity of the valve body in a meshed mode and can move up and down is arranged on the gland in a penetrating and sliding mode, a valve clack is arranged at the bottom end of the lead screw in a sleeved mode, an O-shaped sealing ring is arranged between the inner wall of the gland and the outer wall of the lead screw, and the space between the outer wall of the O-shaped sealing ring and the inner wall of the gland and the space between the outer wall of the O-shaped sealing ring and the outer wall of the lead screw are filled with lubricating agents. A check block is arranged between the lead screw and the bottom of the inner wall of the gland, the space between the check block and the inner wall of the gland is filled with a lubricant, the space between the check block and the lead screw is filled with a lubricant, the friction resistance between the lead screw and the check block is reduced through the lubricant when the lead screw is rotated, and the lead screw is made to rotate along the radian of the O-shaped sealing ring.

Description

Technical Field

[0001] The utility model relates to the technical field of fire protection, in particular to a fire protection water crane drain valve. Background Art

[0002] A fire hydrant is a special water intake facility for firefighting in a city's water supply system. It consists of an underground part (main control water valve, excess water discharge device, opening and closing linkage mechanism) and an above-ground part (water diversion pipe and sheath, fire hose interface, rotating mechanism, telescopic mechanism, etc.). It has the characteristics of swingability, telescopicity, antifreeze, and fast opening and closing. It is mostly used for rapid water supply by fire trucks. After the fire hydrant is used, some water will remain in its pipes, and a fire hydrant drain valve needs to be installed in the pipes of the fire hydrant to drain the accumulated water. The fire hydrant drain valve can guide the water flow normally when water is entering, and when closed, the accumulated water is discharged through its opening, effectively preventing water from accumulating in the fire hydrant.

[0003] Although the above-mentioned prior art can solve the corresponding technical problems, there are still certain defects: when the existing fire water crane drain valve is in use, since its sealing member is a rubber sleeve, it has resilience, and when opening and closing, resistance will be generated due to the resilience of the rubber sleeve. Therefore, when the rotary opening and closing member is opened, a large force needs to be applied to open it smoothly, which is inconvenient to use. Utility Model Content

[0004] The purpose of the utility model is to provide a fire hydrant drain valve which is labor-saving to open and easy to use in view of the defects and shortcomings of the prior art.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a fire water crane drain valve, comprising a valve body and a pressure plate detachably arranged on the bottom surface of the valve body for closing the bottom of the valve body, the pressure plate being provided with a penetrating drain port, the top of the valve body being provided with a pressure cover, the pressure cover being penetrated and slidably provided with a screw rod which is meshed and connected with the inner cavity of the valve body and can move up and down, the bottom end of the screw rod being sleeved with a valve disc, an O-ring being provided between the inner wall of the pressure cover and the outer wall of the screw rod, a lubricant being filled between the outer wall of the O-ring, the inner wall of the pressure cover and the outer wall of the screw rod, a stopper being provided between the screw rod and the bottom of the inner wall of the pressure cover, a lubricant being filled between the stopper and the inner wall of the pressure cover, a lubricant being filled between the stopper and the screw rod, the rotating screw rod reduces the friction resistance between the screw rod and the stopper through the lubricant, and causes the screw rod to rotate along the arc of the O-ring.

[0006] A further improvement is that connecting flanges are provided on both sides of the valve body.

[0007] A further improvement is that a second sealing ring is provided between the top surface of the valve body and the bottom surface of the gland.

[0008] A further improvement is that the valve flap includes a valve flap block inserted into the bottom end of the screw rod and a lower closing block arranged on the bottom surface of the valve flap block. The valve flap block can move upward with the screw rod and close the valve body, and the lower closing block can move downward with the screw rod and close the drain outlet.

[0009] A further improvement is that: an extension block is provided on the side wall of the valve disc block, and a sealing block is provided on the top surface of the extension block.

[0010] A further improvement is that a positioning rod is penetrated through the lower closing block.

[0011] A further improvement is that a closing ring is provided on the lower surface of the lower closing block.

[0012] After adopting the above technical solution, the beneficial effect of the utility model is as follows: during the opening process of the utility model, when the screw rod is rotated, since the pressure cover and the screw rod are sealed by the O-ring, the direction of the torque generated by the rotation is the same as the curvature of the O-ring, and thus compared with the traditional rubber sleeve, the deformation amplitude of the O-ring is greatly reduced, and the resulting rebound resistance is greatly reduced, thereby reducing the force required to twist the screw rod. At the same time, lubricant is filled between the O-ring, the block, the screw rod and the pressure cover, which greatly reduces the friction resistance of the screw rod rotation, thereby making the opening of the fire water crane drain valve more labor-saving and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0014] Figure 1 This is a schematic diagram of the structure of the front cross-section of the fire-fighting water crane discharge valve of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the front cross section of the valve disc of the utility model. DETAILED DESCRIPTION

[0016] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0017] See Figure 1-2As shown, the technical solution adopted in this specific embodiment is: a fire water crane drain valve, including a valve body 1 and a pressure plate 4 detachably arranged on the bottom surface of the valve body 1 for closing the bottom of the valve body 1, the pressure plate 4 is provided with a through drain port 5, the top of the valve body 1 is provided with a pressure cover 3, the pressure cover 3 is penetrated and slidably provided with a screw rod 6 engaged with the inner cavity of the valve body 1 and movable up and down, the bottom end of the screw rod 6 is sleeved with a valve disc 2, the valve disc 2 includes a valve disc block 21 sleeved and arranged at the bottom end of the screw rod 6 and a lower closing block 22 arranged on the bottom surface of the valve disc block 21, the valve disc block 21 can move upward with the screw rod 6 and close the valve body 1 , the lower closing block 22 can move downward with the screw rod 6 and close the drain port 5, an O-ring 7 is provided between the inner wall of the gland 3 and the outer wall of the screw rod 6, and a lubricant is filled between the outer wall of the O-ring 7 and the inner wall of the gland 3 and the outer wall of the screw rod 6. A stopper 10 is provided between the screw rod 6 and the bottom of the inner wall of the gland 3, and a lubricant is filled between the stopper 10 and the inner wall of the gland 3. The lubricant is filled between the stopper 10 and the screw rod 6. The rotating screw rod 6 reduces the friction resistance between the stopper 10 and the screw rod 6 through the lubricant, and makes the gland 3 rotate along the arc of the O-ring 7. The screw rod 6 is made of 2Cr13 material, which is rust-resistant and resistant The abrasive resistance is strong. When in use, the fire crane drain valve is installed into the water inlet pipe of the fire crane. When water is not needed, the valve disc 2 is raised so that the top side wall of the valve disc block 21 fits the closed valve body 1 to prevent water from passing through. When water needs to pass through, the screw rod 6 is rotated to drive the valve disc 2 down, and make its bottom fit against the pressure plate 4 and close the drain port 5 through the lower closing block 22, so that water can pass through the valve body 1 and be discharged outward. After use, the screw rod 6 is reversed to drive the valve disc 2 to rise and reclose the valve body 1. At this time, the lower closing block 22 of the valve disc 2 no longer closes the drain port 5, so The accumulated water in the pipe of the fire water crane is made to flow back and be discharged outward through the drain port 5. When the screw rod 6 is rotated, since the gland 3 and the screw rod 6 are sealed by the O-ring 7, the direction of the torque generated by the rotation is the same as the curvature of the O-ring 7. Therefore, compared with the traditional rubber sleeve, the deformation amplitude of the O-ring 7 is greatly reduced, and the rebound resistance generated thereby is greatly reduced, thereby reducing the force required to twist the screw rod 6. At the same time, lubricant is filled between the O-ring 7, the stopper 10, the screw rod 6 and the gland 3, which greatly reduces the friction resistance of the screw rod 6 during rotation, thereby making the opening of the fire water crane drain valve more labor-saving and convenient.

[0018] The valve body 1 is provided with connecting flanges 9 on both sides, which is conducive to making the valve body 1 more quickly and conveniently installed in the pipeline;

[0019] A second sealing ring 8 is further provided between the top surface of the valve body 1 and the bottom surface of the gland 3, which is beneficial to further improve the sealing performance between the valve body 1 and the gland 3 and prevent water leakage;

[0020] The side wall of the valve disc block 21 is provided with an extension block, and the top surface of the extension block is provided with a sealing block 25, which is beneficial to improving the sealing performance of the valve disc block 21 and making the sealing effect on the valve body 1 better;

[0021] The lower closing block 22 is also provided with a positioning rod 23, which is conducive to the positioning rod 23 being inserted into the drain outlet 5 to prevent the valve disc 2 from being skewed and affecting the sealing effect of the lower closing block 22 on the drain outlet 5;

[0022] A sealing ring 24 is provided on the lower surface of the lower sealing block 22 , which is beneficial to improving the sealing effect of the lower sealing block 22 on the drain outlet 5 and preventing water leakage.

[0023] At the same time, the O-ring 7 and the second sealing ring 8 can be made of nitrile rubber material, which has a longer service life.

[0024] The working principle of the present invention is as follows: when the present invention is used, the fire crane drain valve is installed in the water inlet pipe of the fire crane. When water is not needed, the valve disc 2 is raised so that the top side wall of the valve disc block 21 fits the closed valve body 1 to prevent water from passing through. When water needs to pass through, the screw rod 6 is rotated to drive the valve disc 2 down, and the bottom thereof fits the pressure plate 4 and closes the drain outlet 5 through the lower closing block 22, so that water can pass through the valve body 1 and be discharged outwards. After use, the screw rod 6 is reversed to drive the valve disc 2 to rise and reclose the valve body 1. At this time, the lower closing block 22 of the valve disc 2 no longer closes the drain. The water outlet 5 causes the accumulated water in the pipe of the fire water crane to flow back and be discharged outwards through the drain outlet 5. When the screw rod 6 is rotated, since the pressure cover 3 and the screw rod 6 are sealed by the O-ring 7, the direction of the torque generated by the rotation is the same as the curvature of the O-ring 7. Compared with the traditional rubber sleeve, the deformation amplitude of the O-ring 7 is greatly reduced, and the rebound resistance generated thereby is greatly reduced, thereby reducing the force required to twist the screw rod 6. At the same time, lubricant is filled between the O-ring 7, the stopper 10, the screw rod 6 and the pressure cover 3, which greatly reduces the friction resistance of the screw rod 6 during rotation, thereby making the opening of the fire water crane drain valve more labor-saving and convenient.

[0025] This utility model protects the product's structure; the component models are not the subject of this utility model's protection and are generally known technology. Any commercially available component that can achieve the aforementioned functions of this utility model can be used as an alternative. Therefore, component models and other parameters are not described in detail in this utility model. The contribution of this utility model lies in the scientific combination of the components.

[0026] The above shows and describes 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 above embodiments and descriptions are only for illustrative purposes. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements shall fall within the scope of the present invention as claimed. The scope of protection claimed in the present invention shall be defined by the appended claims and their equivalents. Any details not described in the present invention are well known to those skilled in the art.

Claims

1. A fire hydrant drain valve, comprising a valve body (1) and a pressure plate (4) detachably arranged on the bottom surface of the valve body (1) for closing the bottom of the valve body (1), the pressure plate (4) being provided with a drain port (5) penetrating therethrough, a pressure cover (3) being provided on the top of the valve body (1), a screw rod (6) being slidably provided on the pressure cover (3) and being meshed and connected with the inner cavity of the valve body (1) and being movable up and down, the bottom end of the screw rod (6) being sleeved with a valve flap (2), characterized in that: An O-type sealing ring (7) is provided between the inner wall of the gland (3) and the outer wall of the screw rod (6), and lubricant is filled between the outer wall of the O-type sealing ring (7) and the inner wall of the gland (3) and the outer wall of the screw rod (6). A stopper (10) is provided between the screw rod (6) and the bottom of the inner wall of the gland (3), and lubricant is filled between the stopper (10) and the inner wall of the gland (3). Lubricant is filled between the stopper (10) and the screw rod (6). The rotating screw rod (6) reduces the friction resistance between the stopper (10) and the screw rod (6) through the lubricant, and causes the screw rod (6) to rotate along the arc of the O-type sealing ring (7).

2. A fire hydrant drain valve according to claim 1, characterized in that: Connecting flanges (9) are provided on both sides of the valve body (1).

3. A fire hydrant drain valve according to claim 1, characterized in that: A second sealing ring (8) is also provided between the top surface of the valve body (1) and the bottom surface of the gland (3).

4. A fire hydrant drain valve according to claim 1, characterized in that: The valve flap (2) comprises a valve flap block (21) which is inserted into the bottom end of the screw rod (6) and a lower closing block (22) which is arranged on the bottom surface of the valve flap block (21). The valve flap block (21) can move upward along with the screw rod (6) and close the valve body (1), and the lower closing block (22) can move downward along with the screw rod (6) and close the drain outlet (5).

5. A fire hydrant drain valve according to claim 4, characterized in that: An extension block is provided on the side wall of the valve disc block (21), and a sealing block (25) is provided on the top surface of the extension block.

6. A fire hydrant drain valve according to claim 4, characterized in that: A positioning rod (23) is also provided through the lower closing block (22).

7. A fire hydrant drain valve according to claim 4 or 5, characterized in that: A closing ring (24) is provided on the lower surface of the lower closing block (22).

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