Non-return device for adapter of fire pump

Abstract

The utility model belongs to the technical field of fire-fighting equipment, and particularly relates to a fire-fighting water pump adapter check device which comprises a valve seat, a valve cover, a valve clack and a guide rod in threaded connection with the valve clack, a first spring is arranged between the guide rod and the valve clack, a through water outlet channel is arranged in the valve seat, and the lower end of the water outlet channel is provided with a plurality of sections of stepped holes with different hole diameters. Waterproof sealing rings are installed on the end faces of the stepped holes, the valve clack is provided with a plurality of circular truncated cones, the number of the circular truncated cones is equal to that of the stepped holes, and the sizes and the shapes of the circular truncated cones are matched with those of the stepped holes. The valve clack is provided with a plurality of sections of circular truncated cones, stepped holes and a plurality of waterproof sealing rings, a multi-sealing structure is formed, the anti-backflow sealing effect is improved, the check device is installed on the valve cover, the closing speed of the valve clack is slowed down, the water hammer phenomenon can be avoided, and a fire-fighting pipe network can be better protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of fire fighting equipment, and in particular relates to a fire fighting water pump connector non-return device. Background Art

[0002] The fire pump connector is a fire-fighting facility for high-rise buildings. The water pump of the fire truck can be connected to the water supply system of the automatic sprinkler fire extinguishing system in the building through the interface of the connector and deliver water for pressurization to extinguish fires on different floors. In order to prevent water from flowing back, the system will generate negative pressure when the water source is closed, which will cause problems such as idling and overheating of the pump. Installing a check valve in front of the fire pump connector is a common way to ensure the safety of the system. Check valves are also called non-return valves and one-way valves. This type of valve is automatically opened and closed by the force generated by the flow of the medium itself in the system. It is an automatic valve.

[0003] There are many non-return devices proposed in the prior art. For example, a non-return device applied to a fire pump coupling is proposed in a Chinese utility model patent with publication number CN 207024462 U. The device includes a valve cover, a valve body, a valve flap, a spring and a valve stem. There is a water flow channel in the valve body. A fixed seat is provided at the bottom of the water flow channel, which is threadedly connected to the valve flap through the fixed seat. A spring is provided between the valve stem and the fixed seat. The valve body is provided with a water flow channel that passes through the upper and lower parts, and the water can flow out from the bottom of the valve body. It has a simple structure and is easy to process. However, the utility model has the problems of poor sealing between the valve flap and the valve body and incomplete backflow prevention. Utility Model Content

[0004] The utility model aims to provide a fire pump coupling non-return device to solve the problems raised in the above background technology.

[0005] In order to achieve the above technical purpose, the technical solution of the utility model is:

[0006] A fire pump connector check device, comprising a valve seat, a valve cover is threadedly connected to the upper end of the valve seat, a first waterproof sealing ring is arranged on the end surface of the valve cover and the valve seat, a water inlet channel is penetrated by the valve cover, a water outlet channel is arranged at the lower end of the valve seat, a valve disc is installed in the water outlet channel, a valve body inner cavity is arranged in the valve seat between the valve cover and the valve disc, the water inlet channel and the water outlet channel are respectively communicated with the valve body inner cavity, a guide mechanism is connected to the top of the valve disc, and the guide mechanism is slidably matched with the valve seat;

[0007] A plurality of stepped holes are provided at the lower part of the valve seat corresponding to the water outlet channel, the aperture of the stepped holes at the upper part is larger than the aperture of the stepped holes at the lower part, and the aperture of each stepped hole gradually increases from the top end to the bottom end;

[0008] The valve flap is provided with multiple sections of frustum, the sizes and shapes of the multiple sections of frustum correspond one to one with the apertures and shapes of the multiple sections of the stepped holes, the multiple sections of the frustum are snap-fittedly connected with the multiple sections of the stepped holes, and a waterproof sealing ring is provided on the contact surface between the frustum and the stepped holes.

[0009] As a further improvement, the valve cover is equipped with a slow closing device, which includes a piston head, a piston rod, a cylinder body, a guide tube and a ball valve. The cylinder body is installed through the valve cover, the piston head is sealingly and slidably installed in the cylinder body, the bottom surface of the piston head is fixedly connected to the piston rod, and a second spring is provided between the piston head and the top of the cylinder body;

[0010] The valve cover is also penetrated by a leakage hole, one end of which is communicated with the inner cavity of the valve body, and the other end is connected to a ball valve, the ball valve is connected to a conduit, and the conduit is communicated with the cylinder body.

[0011] As a further improvement, the guide mechanism includes a guide rod, the bottom end of the guide rod is threadedly connected to the valve disc, the top end of the guide rod is fixedly connected to a top block, the top block is provided with a through hole for water flow to pass through, and the top block is abutted against the piston rod;

[0012] A support arm is provided near the bottom of the valve seat, the support arm is provided with a guide hole, the guide rod is slidably installed in the guide hole, the guide rod sleeve is provided with a first spring, the top end of the first spring abuts against the top block, and the bottom end abuts against the top of the guide hole.

[0013] As a further improvement, the valve cover is threadedly connected to the valve seat, and a waterproof sealing ring is provided between the bottom end of the valve cover and the top end of the valve seat; a waterproof sealing ring is provided on the end surface of the bottom end of the valve seat, and the waterproof sealing ring is adapted to the top surface of the cone.

[0014] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0015] The fire pump coupler check device provided by the utility model has a plurality of stepped holes arranged in the water outlet channel of the valve seat, and a frustum matching the stepped holes of the valve seat is arranged on the valve disc, the two form a multi-sealed structure, and the sealing effect of the check valve is enhanced.

[0016] In addition, the slow-closing device is provided to slow down the closing speed of the valve disc, thereby reducing the occurrence of water hammer caused by sudden closing of the valve disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of this embodiment;

[0018] Figure 2 Schematic diagram of the internal structure of this embodiment;

[0019] Figure 3 It is a structural schematic diagram of the slow closing device;

[0020] Among them: 1-valve cover, 2-valve seat, 3-valve disc, 4-guide mechanism, 401-guide rod, 402-top block, 5-first spring, 6-slow closing device, 601-piston head, 602-piston rod, 603-cylinder body, 604-second spring, 605-conduit, 606-ball valve, 607-side cavity, 7-leakage hole, 8-first waterproof sealing ring, 9-valve body inner cavity, 10-second waterproof sealing ring, 11-third waterproof sealing ring, 12-fourth waterproof sealing ring. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the specific implementation methods and the accompanying drawings. The accompanying drawings are only for illustrative purposes and are only schematic diagrams, not actual drawings, and should not be construed as limiting the present application. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. It is understandable to those skilled in the art that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0022] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0023] like Figure 1-3 As shown, a fire pump coupler check device includes a valve seat 2, a valve cover 1 is threadedly connected to the upper end of the valve seat 2, a first waterproof sealing ring 9 is arranged on the end surface of the valve cover 1 and the valve seat 2, a water inlet channel is penetrated by the valve cover 1, a water outlet channel is arranged at the lower end of the valve seat 2, a valve disc 3 is installed in the water outlet channel, a valve body inner cavity 10 is arranged between the valve cover 1 and the valve disc 3 in the valve seat 2, the water inlet channel and the water outlet channel are respectively connected to the valve body inner cavity 10, a guide mechanism 4 is threadedly connected to the top of the valve disc 3, the guide mechanism 4 is slidably matched with the valve seat 2, and plays a guiding role for the valve disc 3.

[0024] A plurality of stepped holes are provided at the lower part of the valve seat 2 corresponding to the position of the water outlet channel, the aperture of the stepped hole at the upper position is larger than the aperture of the stepped hole at the lower position, and the aperture of each stepped hole gradually increases from the top to the bottom; the valve disc 3 is provided with a plurality of frustums, the size and shape of the plurality of frustums correspond one to one with the aperture and shape of the plurality of stepped holes, the plurality of frustums are buckled together with the plurality of stepped holes, and a waterproof sealing ring is provided on the contact surface between the frustum and the stepped hole, and when the plurality of frustums are buckled together with the plurality of stepped holes, the frustum squeezes the corresponding waterproof sealing ring so that it abuts against the end face of the step hole to form a sealing fit.

[0025] When this embodiment is used, the outlet channel of the valve seat 22 is connected to the fire protection pipe network, and the inlet channel is connected to the water inlet pipe. Water flows from the inlet channel into the inner cavity 10 of the valve body, and the impact pushes the valve flap 3 to separate from the valve seat 2 and flow out from the outlet channel. After the water flow is cut off, under the elastic force of the first spring 5, the valve flap 3 moves toward the valve seat 2, and the frustum of the valve flap 3 is tightly fitted with the stepped hole of the valve seat 2, and a waterproof sealing ring is correspondingly arranged on the end face of the valve seat 2, forming a multiple sealing structure to enhance the sealing performance. Specifically, in this embodiment, there are 3 sections of stepped holes, which are respectively installed with the second waterproof sealing ring 10, the third waterproof sealing ring 11 and the fourth waterproof sealing ring 12. Of course, in actual use, other numbers of waterproof sealing rings can also be set according to specific circumstances, and the number of waterproof sealing rings is not limited here.

[0026] In this embodiment, a slow-closing device is installed on the valve cover 1, and the slow-closing device includes a piston head 601, a piston head 602, a cylinder body 603, a second spring 604, a guide tube 605 and a ball valve 606. The cylinder body 603 is installed through the valve cover 1, and the piston head 601 is sealed and slidably installed in the cylinder body 603. The bottom surface of the piston head 601 is fixedly connected to the piston rod 602, and a second spring 604 is provided between the piston head 601 and the top of the cylinder body 603.

[0027] The valve cover 1 is also penetrated by a leakage hole 7 , one end of which is connected to the inner cavity 10 of the valve body, and the other end is connected to a ball valve 606 , the ball valve 606 is connected to a conduit 605 , and the conduit 605 is connected to the cylinder body 603 .

[0028] In this embodiment, the guide mechanism 4 includes a guide rod 401, the bottom end of the guide rod 401 is threadedly connected to the valve disc 3, the top end of the guide rod 401 is fixedly connected to a top block 402, the top block 402 is provided with a through hole for water flow to pass through, and the top block 402 is abutted against the piston head 602;

[0029] A support arm is provided near the bottom of the valve seat 2, and a guide hole is provided in the support arm. A guide rod 401 is slidably installed in the guide hole. A first spring is sleeved on the guide rod 401. The top end of the first spring abuts against the top block 402, and the bottom end abuts against the top of the guide hole. During the opening and closing process of the valve disc 3, the guide mechanism 4 plays a guiding role.

[0030] When this embodiment is used, the lower end of the valve seat 2 is externally threaded to connect to the joint of the fire protection pipe network, and the upper end of the valve cover 1 is connected to the interface of the water inlet pipe. When no water flows, the first spring 5 and the second spring 603 are both in a compressed state, and the elastic force of the first spring 5 is specifically set to be greater than the gravity of the valve disc and the elastic force of the second spring, so that the valve disc and the valve seat are sealed and buckled, and the bottom end of the piston rod is against the guide rod.

[0031] After the water source is connected, water flows into the inner cavity of the valve body from the water inlet channel at the upper end of the valve cover 1, impacting the valve disc. As the impact force of the water flow increases, the valve disc overcomes the elastic force of the first spring and moves downward to separate from the valve seat, while driving the guide rod 4 to move downward to further compress the first spring. At this time, the fire pump connector check device is in a conducting state, and the water flows through the stepped hole of the water outlet channel to the fire pipe network. At this time, the piston rod 602 moves to the lower end of the side cavity 607 under its own gravity and the thrust of the second spring 603, and the water in the valve body cavity enters the side cavity 607 through the leakage hole 7, the ball valve 606 and the guide tube 605 in turn.

[0032] When the water supply at the water inlet stops, the valve disc 3 and the guide rod 4 move upward under the elastic force of the first spring 5. Before the valve disc 3 contacts the valve seat 2, the top block 8 first contacts the lower part of the piston rod 602 and pushes the piston rod 602 to move upward together, until the valve disc 3 is tightly fitted with the second waterproof seal ring 10, the third waterproof seal ring 11 and the fourth waterproof seal ring 12 on the valve seat 2, and then the guide rod 4 and the piston rod 602 stop moving. During the upward movement of the piston rod 602, the piston head 601 will discharge the water in the side cavity 607 to the inner cavity 10 of the valve body through the conduit 605, the ball valve 606 and the drain hole 7 in sequence. In this process, since there is still some residual water in the inner cavity 10 of the valve body and the aperture of the side cavity 607 is larger than the aperture of the conduit 605, it takes a certain amount of time to discharge the excess water in the side cavity 607, which greatly slows down the closing speed of the valve disc 3, prevents the occurrence of water hammer, and can effectively protect the fire protection pipe network facilities. Specifically, the flow rate of the water flow can be adjusted by adjusting the opening of the ball valve 606 to meet the usage requirements of different scenarios.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A fire pump connector check device, comprising a valve seat, a valve cover is threadedly connected to the upper end of the valve seat, a first waterproof sealing ring is arranged on the end surface of the valve cover and the valve seat, a water inlet channel is penetrated by the valve cover, a water outlet channel is arranged at the lower end of the valve seat, a valve disc is installed in the water outlet channel, a valve body inner cavity is arranged in the valve seat between the valve cover and the valve disc, the water inlet channel and the water outlet channel are respectively communicated with the valve body inner cavity, and the characteristics are as follows: The top of the valve disc is threadedly connected with a guide mechanism, and the guide mechanism is slidably matched with the valve seat; A plurality of stepped holes are provided at the lower part of the valve seat corresponding to the water outlet channel, the aperture of the stepped holes at the upper part is larger than the aperture of the stepped holes at the lower part, and the aperture of each stepped hole gradually increases from the top end to the bottom end; The valve flap is provided with multiple sections of frustum, the sizes and shapes of the multiple sections of frustum correspond one to one with the apertures and shapes of the multiple sections of the stepped holes, the multiple sections of the frustum are snap-fittedly connected with the multiple sections of the stepped holes, and a waterproof sealing ring is provided on the contact surface between the frustum and the stepped holes.

2. A fire pump coupling non-return device according to claim 1, characterized in that: The valve cover is provided with a slow closing device, which includes a piston head, a piston rod, a cylinder body, a guide tube and a ball valve. The cylinder body is installed through the valve cover, the piston head is installed in a sealing and sliding manner in the cylinder body, the bottom surface of the piston head is fixedly connected to the piston rod, and a second spring is provided between the piston head and the top of the cylinder body; The valve cover is also penetrated by a leakage hole, one end of which is communicated with the inner cavity of the valve body, and the other end is connected to a ball valve, the ball valve is connected to a conduit, and the conduit is communicated with the cylinder body.

3. A fire pump coupling non-return device according to claim 2, characterized in that: The guide mechanism comprises a guide rod, the bottom end of which is threadedly connected to the valve disc, the top end of which is fixedly connected to a top block, the top block is provided with a through hole for water flow to pass through, and the top block is butted against the piston rod; A support arm is provided near the bottom of the valve seat, the support arm is provided with a guide hole, the guide rod is slidably installed in the guide hole, the guide rod sleeve is provided with a first spring, the top end of the first spring abuts against the top block, and the bottom end abuts against the top of the guide hole.

4. A fire pump coupling non-return device according to any one of claims 1 to 3, characterized in that: The valve cover is threadedly connected to the valve seat, and a waterproof sealing ring is provided between the bottom end of the valve cover and the top end of the valve seat; a waterproof sealing ring is provided on the end surface of the bottom end of the valve seat, and the waterproof sealing ring is adapted to the top surface of the truncated cone.

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