Lifting type bottom valve for farm irrigation

Abstract

The lifting type bottom valve comprises a valve body, a valve seat and a valve element assembly, the valve body is in a long strip shape, a water flow channel penetrating through the valve body is formed in the valve body, the valve body is vertically installed on the valve seat, a filter grid is arranged on the lower portion of the valve body, and the valve element assembly comprises a fixed piece and a movable piece. The fixed piece is fixedly installed in the water flow channel, a water through hole is formed in the middle of the fixed piece, the movable piece is arranged above the fixed piece in a lifting mode so as to descend to block the water through hole or ascend to open the water through hole, and a flow guide cover is arranged on the lower end face of the movable piece so as to guide water flow to flow to the edge of the movable piece. According to the lifting type bottom valve for farm irrigation, the valve element assembly capable of being opened and closed greatly can be effectively achieved through the action of the fixed piece and the movable piece, and meanwhile water resistance can be further reduced and flow can be further increased through the arrangement of the flow guide cover.

Description

Technical Field

[0001] This utility model relates to a bottom valve, and more specifically to a lifting bottom valve for farmland irrigation. Background Technology

[0002] In current agricultural irrigation systems, a foot valve is typically installed at the inlet of each water pump to prevent backflow when the pump stops and to prevent dry running when restarting, thus protecting the equipment and system. Existing foot valves with lift-type check valve structures usually have a flat valve disc. When the foot valve is open, the water flow path through the valve disc is mostly at a 90-degree angle, resulting in significant water resistance and affecting the flow capacity of the foot valve. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a lifting bottom valve for farmland irrigation with low flow resistance and large flow capacity.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a lifting bottom valve for farmland irrigation, comprising a valve body, a valve seat, and a valve core assembly. The valve body is elongated and has a water flow channel extending through it. The valve body is vertically mounted on the valve seat, and a filter screen is provided at the lower part of the valve body. The valve core assembly comprises a fixed plate and a moving plate. The fixed plate is fixedly installed in the water flow channel, and a water passage hole is provided in the middle of the fixed plate. The moving plate is vertically and flexibly positioned above the fixed plate to lower and block the water passage hole or raise and open the water passage hole. A guide cover is provided on the lower end face of the moving plate to guide the water flow to the edge of the moving plate.

[0005] As a further improvement of this utility model, the guide cover has a hollow conical structure.

[0006] As a further improvement of this utility model, the moving piece includes a sliding column, a mounting plate and a sealing ring. The mounting plate is coaxially fixed to the lower end of the sliding column, and the sealing ring is coaxially sleeved on the mounting plate. The channel wall of the water flow channel is provided with several vertically extending sliding edges. The several sliding edges are circumferentially distributed to form a cylindrical channel for the sliding column to slide up and down.

[0007] As a further improvement of this utility model, the lower end of the sliding column is integrally formed with the mounting plate, the outer side of the mounting plate is provided with a step, and the flow guide cover is coaxially fixed to the lower end surface of the mounting plate by bolts. The upper end surface of the flow guide cover cooperates with the step to form a groove structure for accommodating the sealing ring.

[0008] As a further improvement of this utility model, both the sealing ring and the fixing plate are made of ceramic material.

[0009] As a further improvement of this utility model, the valve body includes an upper valve body and a lower valve body, both of which are hollow structures. The filter grid is disposed on the lower valve body, the fixed plate is fixedly installed on the upper end of the lower valve body, and the movable plate is movably disposed in the upper valve body. The lower end of the upper valve body and the upper end of the lower valve body are both provided with skirts. The skirts of the upper valve body and the lower valve body are simultaneously wrapped by a U-shaped clamp, so that the lower end of the upper valve body is coaxially and fixedly installed on the upper end of the lower valve body.

[0010] The beneficial effects of this utility model are that by setting the valve core assembly into a fixed plate and a moving plate, a structure for opening and closing a large flow rate can be formed. Furthermore, the gravity of the fixed plate can effectively achieve a check valve effect. The moving plate requires less space for movement compared to the existing flap check valve. In addition, by setting a flow guide cover on the lower end face of the moving plate, the flow guide cover can effectively reduce the water resistance caused by the valve core assembly and further increase the flow rate. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the lifting bottom valve for farmland irrigation of this utility model in the closed state;

[0012] Figure 2 This is a schematic diagram of the lifting bottom valve for farmland irrigation of this utility model in the open state. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0014] Reference Figures 1 to 2 As shown, this embodiment of a lifting bottom valve for farmland irrigation includes a valve body 1, a valve seat 2, and a valve core assembly 3. The valve body 1 is elongated and has a water flow channel running through it. The valve body 1 is vertically mounted on the valve seat 2. A filter screen 4 is provided at the lower part of the valve body 1. The valve core assembly 3 includes a fixed plate 31 and a moving plate 32. The fixed plate 31 is fixedly installed in the water flow channel. A water passage hole 311 is provided in the middle of the fixed plate 31. The moving plate 32 is movably positioned above the fixed plate 31 to lower and block the water passage hole 311 or raise and open the water passage hole 311. A guide cover 321 is provided on the lower end face of the moving plate 32 to guide the water flow to the edge of the moving plate 32. In the process of using the bottom valve in this embodiment, it is only necessary to install a water pump on the upper end of the valve body 1 and fix the valve seat 2 to the bottom of the external water source so that the external water source submerges the filter screen. Then, the following working state will occur:

[0015] Closed

[0016] like Figure 1As shown, at this time, the water pump at the upper end of the valve body 1 does not generate suction, and the water flows downward. Therefore, the moving plate 32 cooperates with the fixed plate 31 to seal under the action of gravity, preventing water from flowing into the filter screen through the fixed plate 31, so as to achieve the effect of check flow.

[0017] On status

[0018] like Figure 2 As shown, at this time, the water pump at the upper end of the valve body 1 generates suction. First, the water above the moving plate 32 is drawn away, and then a negative pressure is formed, causing the moving plate 32 to slide upward. With the action of the negative pressure, the water will enter the valve body 1 through the filter screen, and then enter the upper end of the valve body 1 through the fixed plate 31 and finally be drawn away by the water pump. During the process of the water flow towards the moving plate 32, due to the presence of the guide cover 321, it will be guided to the side of the moving plate 32, thereby reducing the resistance of the moving plate 32 to the water flow, thus effectively achieving the effect of increasing the flow rate.

[0019] As an improved specific implementation, the hollow conical structure of the flow guide cover 321 can effectively achieve the flow guiding effect on the one hand, and reduce the overall mass of the moving plate 32 on the other hand, so that the moving plate 32 can slide up and down better with the changes in water flow.

[0020] As an improved specific implementation, the moving piece 32 includes a sliding column 322, a mounting plate 323, and a sealing ring 324. The mounting plate 323 is coaxially fixed to the lower end of the sliding column 322, and the sealing ring 324 is coaxially sleeved on the mounting plate 323. The channel wall of the water flow channel is provided with several vertically extending sliding edges 11. The several sliding edges 11 are circumferentially distributed to form a cylindrical channel for the sliding column 322 to slide up and down. By setting the sliding edges 11, the contact surface between the sliding column 322 and the channel can be minimized, so that the sliding column 322 can slide up and down better. At the same time, the space between two adjacent sliding edges 11 is used to provide a channel for water to flow through, further reducing the water resistance caused by the moving piece 32, thereby increasing the flow rate of the bottom valve.

[0021] As an improved specific implementation, the lower end of the sliding column 322 is integrally formed with the mounting plate 323. A step is provided on the outer side of the mounting plate 323. The flow guide cover 321 is coaxially fixed to the lower end face of the mounting plate 323 by bolts. The upper end face of the flow guide cover 321 mates with the step to form a groove structure for accommodating the sealing ring 324. With this structure, a detachable groove structure can be formed by the step fit between the flow guide cover 321 and the mounting plate 323, making the installation and removal of the sealing ring 324 more convenient and quick. (Refer to...) Figure 1As shown, the flow guide cover 321 is fixed to the mounting plate 323 by means of a bolt threaded to the mounting plate 323 at a position near the left and right sides.

[0022] As an improved specific implementation, both the sealing ring 324 and the fixing plate 31 are made of ceramic material. By using ceramic material to make the sealing ring 324 and the fixing plate 31, a hard seal can be achieved between the two, and the service life of the sealing ring 324 and the fixing plate 31 can be greatly improved.

[0023] As an improved specific implementation, the valve body 1 includes an upper valve body 12 and a lower valve body 13. Both the upper valve body 12 and the lower valve body 13 are hollow structures. The filter grid is disposed on the lower valve body 13. The fixed plate 31 is fixedly installed on the upper end of the lower valve body 13. The movable plate 32 is movably disposed inside the upper valve body 12. The lower end of the upper valve body 12 and the upper end of the lower valve body 13 are provided with skirts. The skirts of the upper valve body 12 and the lower valve body 13 are simultaneously wrapped by a U-shaped clamp, so that the lower end of the upper valve body 12 is coaxially fixedly installed on the upper end of the lower valve body 13. Through the above structure of the upper valve body 12 and the lower valve body 13, a double-layer split valve body 1 structure can be formed, which facilitates subsequent maintenance of the internal components of the valve body 1.

[0024] In summary, the lifting bottom valve for farmland irrigation in this embodiment can effectively form a lifting check valve structure by setting the fixed plate 31 and the moving plate 32. Furthermore, the flow guide cover 321 at the lower end of the moving plate 32 can guide the water flow, thus effectively increasing the flow rate of the bottom valve.

[0025] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A lifting bottom valve for farmland irrigation, comprising a valve body (1), a valve seat (2), and a valve core assembly (3), wherein the valve body (1) is elongated and has a water flow channel extending through it, the valve body (1) is vertically mounted on the valve seat (2), and a filter screen (4) is provided at the lower part of the valve body (1), characterized in that: The valve core assembly (3) includes a fixed plate (31) and a movable plate (32). The fixed plate (31) is fixedly installed in the water flow channel. A water passage hole (311) is provided in the middle of the fixed plate (31). The movable plate (32) is raised and lowered above the fixed plate (31) to block the water passage hole (311) or to open the water passage hole (311) by raising it. The lower end face of the movable plate (32) is provided with a guide cover (321) to guide the water flow to the edge of the movable plate (32).

2. The lifting bottom valve for farmland irrigation according to claim 1, characterized in that: The guide cap (321) has a hollow conical structure.

3. The lifting bottom valve for farmland irrigation according to claim 2, characterized in that: The moving piece (32) includes a sliding column (322), a mounting plate (323), and a sealing ring (324). The mounting plate (323) is coaxially fixed to the lower end of the sliding column (322), and the sealing ring (324) is coaxially sleeved on the mounting plate (323). The channel wall of the water flow channel is provided with several vertically extending sliding edges (11). The several sliding edges (11) are circumferentially distributed to form a cylindrical channel for the sliding column (322) to slide up and down.

4. The lifting bottom valve for farmland irrigation according to claim 3, characterized in that: The lower end of the sliding column (322) is integrally formed with the mounting plate (323). The outer side of the mounting plate (323) is provided with a step. The flow guide cover (321) is coaxially fixed to the lower end surface of the mounting plate (323) by bolts. The upper end surface of the flow guide cover (321) cooperates with the step to form a groove structure for accommodating the sealing ring (324).

5. The lifting bottom valve for farmland irrigation according to claim 4, characterized in that: Both the sealing ring (324) and the fixing plate (31) are made of ceramic material.

6. The lifting bottom valve for farmland irrigation according to any one of claims 1 to 5, characterized in that: The valve body (1) includes an upper valve body (12) and a lower valve body (13). Both the upper valve body (12) and the lower valve body (13) are hollow structures. The filter grid is set on the lower valve body (13). The fixed plate (31) is fixedly installed on the upper end of the lower valve body (13). The movable plate (32) is vertically and vertically arranged inside the upper valve body (12). The lower end of the upper valve body (12) and the upper end of the lower valve body (13) are both provided with skirts. The skirts of the upper valve body (12) and the lower valve body (13) are simultaneously wrapped by a U-shaped clamp, so that the lower end of the upper valve body (12) is coaxially and fixedly installed on the upper end of the lower valve body (13).

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