Straight-through diaphragm backwashing valve

Abstract

The utility model discloses a straight-through type diaphragm backwash valve which comprises a casting body, a lower connector and a driving body, the lower connector and the driving body are symmetrically arranged at the upper end and the lower end of the casting body, a control cavity is formed in the driving body, a partition plate is arranged in the casting body, and a through hole is formed in the center of the partition plate. A water inlet and a filter inlet are symmetrically formed in the two sides of the casting body, the water inlet and the filter inlet are formed in the two sides of the partition plate respectively, a valve rod is arranged in the casting body, the upper end of the valve rod is arranged in the control cavity, a diaphragm is fixedly arranged at the upper end of the valve rod, the diaphragm is fixedly arranged in the control cavity, and a valve body is fixedly arranged at the lower end of the valve rod; the valve body is arranged in the casting body and below the partition plate, and a backwashing opening is formed in the side wall of the lower end of the driving body. The utility model belongs to the technical field of valves, and particularly provides a straight-through type diaphragm backwash valve which is good in weather resistance, capable of stably moving in an outdoor environment for a long time, free of maintenance and longer in overall service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and specifically refers to a direct-through diaphragm backwashing valve. Background Art

[0002] At present, the market of disc filters basically uses three-way backwashing valves made of nylon plastic. The water pressure bearing grade of plastic valves is PN10, which cannot meet the requirements of some working conditions; nylon materials are easy to absorb water. Nylon materials have a large water absorption, which affects the dimensional stability to a certain extent; water absorption will also greatly reduce the mechanical strength of plastics, and the light resistance is poor. It will oxidize with oxygen in the air in a long-term high-temperature environment, the color will turn brown at first, and then it will break and crack. Therefore, there is an urgent need for a new type of direct-through diaphragm backwashing valve to solve the above problems. Content of the Utility Model

[0003] In order to solve the above existing problems, the utility model provides a direct-through diaphragm backwashing valve with good weather resistance, which can move stably outdoors for a long time without maintenance and has a longer overall service life.

[0004] The technical solution adopted by the utility model is as follows: The direct-through diaphragm backwashing valve of the utility model includes a casting body, a lower joint and a driving body. The lower joint and the driving body are symmetrically arranged at the upper and lower ends of the casting body. A control cavity is arranged in the driving body. A partition is arranged in the casting body. A through hole is arranged at the center of the partition. Water inlets and filter inlets are symmetrically arranged on both sides of the casting body. The water inlets and the filter inlets are respectively arranged on both sides of the partition. A valve rod is arranged in the casting body. The upper end of the valve rod is arranged in the control cavity. A diaphragm is fixedly arranged at the upper end of the valve rod. The diaphragm is fixedly arranged in the control cavity. A valve body is fixedly arranged at the lower end of the valve rod. The valve body is arranged in the casting body and below the partition. A backwashing port is arranged on the side wall at the lower end of the driving body. The backwashing port penetrates through the side wall of the driving body and is connected to the control cavity.

[0005] Further, a spring is arranged above the diaphragm. The spring is arranged in the control cavity. Both ends of the spring are fixedly connected to the control cavity and the diaphragm respectively.

[0006] Further, a sewage discharge port is arranged at the lower end of the lower joint. The sewage discharge port penetrates through the lower joint and is connected to the casting body. The through hole is arranged above the sewage discharge port.

[0007] Further, a lower valve seat is arranged at the connection between the casting body and the lower joint. An upper valve seat is arranged in the through hole.

[0008] Further, a sealing ring is fixedly arranged in the driving body. The sealing ring is sleeved outside the valve rod.

[0009] Further, the materials of the casting body, the lower joint, the driving body, the valve rod and the valve body are made of ductile iron.

[0010] The beneficial effects achieved by the present utility model with the above structure are as follows: The straight-through diaphragm backwashing valve proposed in this solution is made of ductile iron and has an environmentally friendly powder coating on its surface. The water pressure bearing grade is PN16; the T-shaped straight-through form facilitates pipeline connection; compared with plastic valves used under long-term outdoor sunlight exposure, the overall service life is longer. By controlling the water inlet or outlet of the control chamber and driving the valve plate body to move up and down by the pipeline's own pressure, the switching of three inlets and outlets is realized, and the water flow direction is controlled to achieve automatic backwashing. Brief Description of the Drawings

[0011] Figure 1 It is a three-dimensional view of the straight-through diaphragm backwashing valve proposed in this solution;

[0012] Figure 2 It is a structural schematic diagram of the straight-through diaphragm backwashing valve proposed in this solution;

[0013] Figure 3 It is a three-dimensional view of the diaphragm of the straight-through diaphragm backwashing valve proposed in this solution.

[0014] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings: 1. Casting body, 2. Lower joint, 3. Driving body, 4. Control chamber, 5. Partition board, 6. Through hole, 7. Water inlet, 8. Filter inlet, 9. Valve stem, 10. Diaphragm, 11. Valve body, 12. Backwashing port, 13. Spring, 14. Drain port, 15. Lower valve seat, 16. Upper valve seat, 17. Sealing ring. Detailed Embodiment

[0015] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments; based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0016] As Figures 1 to 3As shown in the figure, the through diaphragm backwash valve proposed in this solution includes a casting body, a lower joint and a driving body. The lower joint and the driving body are symmetrically arranged at the upper and lower ends of the casting body. A control cavity is provided inside the driving body. A partition is provided inside the casting body. A through hole is provided at the center of the partition. Water inlets and filter inlets are symmetrically provided on both sides of the casting body. The water inlets and the filter inlets are respectively arranged on both sides of the partition. A valve stem is provided inside the casting body. The upper end of the valve stem is arranged inside the control cavity. A diaphragm is fixedly provided at the upper end of the valve stem. The diaphragm is fixedly arranged inside the control cavity. A valve body is fixedly provided at the lower end of the valve stem. The valve body is arranged inside the casting body and below the partition. An anti-wash port is provided on the side wall at the lower end of the driving body. The anti-wash port penetrates through the side wall of the driving body and is connected to the control cavity. A spring is provided above the diaphragm. The spring is arranged inside the control cavity. The two ends of the spring are respectively fixedly connected to the control cavity and the diaphragm.

[0017] As Figure 1 and Figure 2 shown, a sewage discharge port is provided at the lower end of the lower joint. The sewage discharge port penetrates through the lower joint and is connected to the casting body. The through hole is provided above the sewage discharge port. A lower valve seat is provided at the connection between the casting body and the lower joint. An upper valve seat is provided inside the through hole. A sealing ring is fixedly provided inside the driving body. The sealing ring is sleeved outside the valve stem.

[0018] Among them, the materials of the casting body, the lower joint, the driving body, the valve stem and the valve body are made of ductile iron.

[0019] During specific use, it includes a casting body 1, a lower joint 2 and a driving body 3. The lower joint 2 and the driving body 3 are symmetrically arranged at the upper and lower ends of the casting body 1. A control cavity 4 is provided inside the driving body 3. A partition 5 is provided inside the casting body 1. A through hole 6 is provided at the center of the partition 5. Water inlets 7 and filter inlets 8 are symmetrically provided on both sides of the casting body 1. The water inlets 7 and the filter inlets 8 are respectively arranged on both sides of the partition 5. A valve stem 9 is provided inside the casting body 1. The upper end of the valve stem 9 is arranged inside the control cavity 4. A diaphragm 10 is fixedly provided at the upper end of the valve stem 9. The diaphragm 10 is fixedly arranged inside the control cavity 4. A valve body 11 is fixedly provided at the lower end of the valve stem 9. The valve body 11 is arranged inside the casting body 1 and below the partition 5. An anti-wash port 12 is provided on the side wall at the lower end of the driving body 3. The anti-wash port 12 penetrates through the side wall of the driving body 3 and is connected to the control cavity 4. A spring 13 is provided above the diaphragm 10. The spring 13 is arranged inside the control cavity 4. The two ends of the spring 13 are respectively fixedly connected to the control cavity 4 and the diaphragm 10.

[0020] As Figure 1 and Figure 2As shown, a sewage outlet 14 is provided at the lower end of the lower joint 2. The sewage outlet 14 penetrates through the lower joint 2 and is connected to the casting body 1. The through hole 6 is provided above the sewage outlet 14. A lower valve seat 15 is provided at the connection between the casting body 1 and the lower joint 2. An upper valve seat 16 is provided in the through hole 6. A sealing ring 17 is fixedly provided in the driving body 3, and the sealing ring 17 is sleeved outside the valve stem 9.

[0021] Among them, the materials of the casting body 1, the lower joint 2, the driving body 3, the valve stem 9 and the valve body 11 are ductile iron.

[0022] During specific use, in the filtration mode, the spring 13 presses down the diaphragm 10, and the diaphragm 10 drives the valve stem 9 to block the valve body 11 in the lower valve seat 15, thereby closing the sewage outlet 14. Water flows from the water inlet 7 to the filter inlet 8 under the pressure difference.

[0023] In the backwashing mode, the backwashing port 12 is opened, and the lower part of the control chamber 4 is filled with water for pressurization. The diaphragm 10 drives the valve body 11 to move upward under pressure, blocking the valve body 11 in the upper valve seat 16, thereby closing the water inlet 7. At the same time, the sewage outlet 14 is opened, and water flows from the filter inlet 8 to the sewage outlet 14 under pressure.

[0024] By controlling the water inlet or outlet of the control chamber 4, the valve body 11 is driven to move up and down by the pressure of the pipeline itself, realizing the switching of the three inlets and outlets, controlling the water flow direction to achieve automatic backwashing. There are options of flange connection, grooved connection and threaded connection, with good weather resistance, and can move stably outdoors for a long time without maintenance.

[0025] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Straight-through diaphragm backwash valve, characterized in that: It includes a casting body, a lower joint and a driving body. The lower joint and the driving body are symmetrically arranged at the upper and lower ends of the casting body. A control cavity is provided in the driving body. A partition is provided in the casting body. A through hole is provided at the center of the partition. Water inlets and filter inlets are symmetrically provided on both sides of the casting body. The water inlets and the filter inlets are respectively provided on both sides of the partition. A valve rod is provided in the casting body. The upper end of the valve rod is arranged in the control cavity. A diaphragm is fixedly provided at the upper end of the valve rod. The diaphragm is fixedly arranged in the control cavity. A valve body is fixedly provided at the lower end of the valve rod. The valve body is arranged in the casting body and below the partition. A backwash port is provided on the side wall at the lower end of the driving body. The backwash port penetrates through the side wall of the driving body and is connected to the control cavity.

2. The through-type diaphragm backwashing valve according to claim 1, wherein: A spring is provided above the diaphragm. The spring is arranged in the control cavity. Both ends of the spring are fixedly connected to the control cavity and the diaphragm respectively.

3. The through-type diaphragm backwashing valve according to claim 1, characterized in that: A drain port is provided at the lower end of the lower joint. The drain port penetrates through the lower joint and is connected to the casting body. The through hole is provided above the drain port.

4. The through-type diaphragm backwashing valve according to claim 1, wherein: A lower valve seat is provided at the connection between the casting body and the lower joint. An upper valve seat is provided in the through hole.

5. The through-type diaphragm backwashing valve according to claim 1, wherein: A sealing ring is fixedly provided in the driving body. The sealing ring is sleeved outside the valve rod.

6. The straight-through diaphragm backwashing valve according to claim 1, wherein: The materials of the casting body, the lower joint, the driving body, the valve rod and the valve body are ductile iron.

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