Automatic control multi-way valve for multi-medium filtering tank

Abstract

The application discloses a multi-medium filtering tank automatic control multi-way valve. The backwashing multi-way valve is stable in work, simple in control, large in flow area, small in pressure loss and short in delay.

Description

Technical Field

[0001] This invention relates to the field of water pretreatment valve manufacturing, specifically to a multi-way valve for automatic control of multi-media filter tanks. Background Technology

[0002] Multimedia filter tanks are widely used equipment in water pretreatment. They have filtration and backwashing requirements, and typically use five valves (electric or pneumatic butterfly valves) to switch between them to achieve the water production and backwashing functions of the multimedia filter. Controlling five valves is complex and costly, and butterfly valves have significant pressure loss. If electric butterfly valves are used, there is a delay in opening and closing; if pneumatic valves are used, an air compressor is required.

[0003] Chinese patent CN120332516A provides two pairs of moving and stationary plates, thereby reducing the number of holes on the sealing plate, increasing the size of a single hole, increasing the flow area, and improving the equipment's processing capacity. By rotating the moving plate, one inlet can correspond to multiple different outlets, thereby achieving filtration and backwashing functions. However, it still has the disadvantages of insufficient processing flow or excessively large equipment size and excessive pressure loss. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the purpose of this invention is to provide a multi-way valve for automatic control of multi-media filter tanks.

[0005] A multi-way valve for automatic control of multi-media filter tanks, comprising:

[0006] A valve body structure body, wherein a first inlet, a second inlet, a third inlet and a fourth inlet are provided on the side wall of the valve body structure body;

[0007] The first and second imports are in different directions;

[0008] The third and fourth inlets are in opposite directions;

[0009] The first inlet is connected to the filter tank inlet, the second inlet is connected to the water pump outlet, the third inlet is connected to the filter tank outlet, and the fourth inlet is connected to the backwash outlet.

[0010] A first sealing piston is provided in the valve body space between the first inlet and the second inlet;

[0011] A second sealing piston is provided in the valve body space between the second inlet and the fourth inlet;

[0012] The first sealing piston and the inner wall of the valve body structure are sealed by an arc surface, a conical surface, or an end face.

[0013] The second sealing piston and the inner wall of the valve body structure are sealed by an arc surface, a conical surface, or an end face.

[0014] The end of the valve body structure is connected to the drive cylinder via a partition and a mounting flange.

[0015] A drive piston is provided inside the drive cylinder;

[0016] The drive piston is controlled by a solenoid valve and is connected to the first sealing piston and the second sealing piston via a drive shaft;

[0017] The drive chamber of the drive cylinder is provided with a first inlet / outlet and a second inlet / outlet at both ends.

[0018] In a preferred embodiment of the present invention, the first inlet, second inlet, third inlet and fourth inlet pipelines are connected to the valve body structure via a tee-joint.

[0019] In a preferred embodiment of the invention, the drive shaft passes through a partition opening in the partition.

[0020] In a preferred embodiment of the present invention, sealing grooves are provided on the outer sides of the first sealing piston and the second sealing piston, and U-shaped sealing rings, Y-shaped sealing rings, or Chevron sealing rings are disposed in the sealing grooves. Preferably, polyurethane Y-shaped sealing rings are used for the bores.

[0021] In a preferred embodiment of the present invention, the first sealing piston and the second sealing piston are provided with a plurality of protrusions spaced apart in the middle;

[0022] A sealing groove and a sealing ring are respectively provided on both sides of the boss of the first sealing piston and the second sealing piston; a sealing ring with a tapered hard sealing surface is provided at one end of the first sealing piston and the second sealing piston.

[0023] The boss and sealing ring are fitted with a clearance fit based on a hole system to the inner wall of the valve body structure, which provides guidance for the first sealing piston and the second sealing piston.

[0024] In a preferred embodiment of the present invention, the first sealing piston and the second sealing piston are provided with a plurality of protrusions spaced apart in the middle, and a floating sealing seat is provided between the outer side of the first sealing piston and the second sealing piston and the sealing ring.

[0025] A sealing ring is provided at one end of the first sealing piston and the second sealing piston;

[0026] The first sealing piston and the second sealing piston are each fixed with a spring or elastic element on the upper and lower sides near the boss. The free end of the spring or elastic element is fixed to the floating sealing seat. The end face of the floating sealing seat is provided with a hard sealing surface.

[0027] The first sealing piston and the second sealing piston are provided with sealing grooves on their outer sides, and sealing rings are provided in the sealing grooves to provide a seal when the floating sealing seat moves.

[0028] When the first sealing piston and the second sealing piston push against the sealing ring, the sealing surfaces of the first sealing piston and the second sealing piston and the floating sealing seat are subjected to the reaction force of the sealing ring, compressing the spring or elastic element, thereby adaptively compensating for all machining and assembly errors and implementing effective sealing.

[0029] In a preferred embodiment of the present invention, the clearance fit of the hole-based system is an H9 / f8 or H8 / f7 fit.

[0030] In a preferred embodiment of the present invention, the valve body structure is a stainless steel pipe or a PVC pipe.

[0031] In a preferred embodiment of the present invention, a guide ring is provided at the front end of the first sealing piston, and the guide ring is made of polytetrafluoroethylene or phenolic resin.

[0032] In a preferred embodiment of the present invention, a sealing groove is provided at the opening of the partition plate, and a polyurethane Y-type sealing ring is provided in the sealing groove.

[0033] In a preferred embodiment of the present invention, a core filler is provided at the mounting end of the mounting flange.

[0034] The beneficial effects of this invention are as follows:

[0035] The backwashing multi-way valve of the present invention operates stably, is simple to control, has a large flow area resulting in low pressure loss, and a shortened delay. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0037] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 (Arc surface seal).

[0038] Figure 3 This is a schematic diagram of the overall structure of the sealing piston.

[0039] Figure 4 This is a schematic diagram of a sealing piston (conical seal).

[0040] Figure 5 This is a schematic diagram of the overall structure of the present invention. Figure 3 (Conical seal).

[0041] Figure 6 This is a schematic diagram of the sealing process for a piston (end face sealing).

[0042] Figure 7 This is a schematic diagram of the overall structure of the present invention. Figure 4 (End face seal).

[0043] Figure 8 This is a force diagram during the state transition of the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, in the following descriptions, well-known structures and technologies are omitted to avoid unnecessarily obscuring the concept of the invention.

[0045] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] A multi-way valve for automatic control of multi-media filter tanks includes a valve body 100, with a first inlet 101, a second inlet 102, a third inlet 103, and a fourth inlet 104 disposed on the side wall of the valve body 100. The valve body 100 can be made of stainless steel or PVC pipe, depending on actual needs. The first inlet 101, the second inlet 102, the third inlet 103, and the fourth inlet 104 can be arranged in the same plane or in a spatial arrangement.

[0047] In this embodiment, the first inlet 101 and the second inlet 102 are not in the same direction, and the third inlet 103 and the fourth inlet 104 are not in the same direction.

[0048] The first inlet 101, the second inlet 102, the third inlet 103, and the fourth inlet 104 are connected to the valve body via tee couplings. Tee couplings can be installed by welding or by connecting sleeves, depending on the requirements.

[0049] Combination Figure 1 It can be seen that the first inlet 101 is connected to the inlet of the filter tank, the second inlet 102 is connected to the outlet of the water pump, the third inlet 103 is connected to the outlet of the filter tank, and the fourth inlet 104 is connected to the backwash outlet.

[0050] A first sealing piston 110 is provided in the valve body space between the first inlet 101 and the second inlet 102.

[0051] A second sealing piston 120 is provided in the valve body space between the second inlet 102 and the fourth inlet 104.

[0052] The end of the valve body structure 100 is connected to the drive cylinder 150 through a partition 130 and a mounting flange 140. The mounting end of the mounting flange 140 is provided with a core 141, which is used to fix the end of the valve body structure 100 in conjunction with the mounting flange.

[0053] A drive piston 160 is provided inside the drive cylinder 150. The drive piston 160 is controlled by a solenoid valve and is connected to the first sealing piston 110 and the second sealing piston 120 through the drive shaft 161.

[0054] The drive shaft 161 passes through the partition opening of the partition 130. A sealing groove 131 is provided at the partition opening of the partition 130, and a polyurethane Y-type sealing ring 132 is provided in the sealing groove 131. The overall sealing effect is improved by using a high-tolerance sealing solution.

[0055] The drive chamber of the drive cylinder 150 is provided with a first inlet / outlet port 151 and a second inlet / outlet port 152 at both ends.

[0056] When the drive piston 160 retracts, the valve body is in the filtering state. Liquid enters through the first inlet / outlet port 151 of the drive cylinder 150, and liquid exits through the second inlet / outlet port 152 of the drive cylinder 150.

[0057] When the single-control solenoid valve is energized, the valve core of the solenoid valve moves. At this time, liquid enters through the second inlet / outlet port 152 of the drive cylinder 150, and liquid exits through the first inlet / outlet port 151 of the drive cylinder 150. The drive piston 160 extends, driving the first sealing piston 110 and the second sealing piston 120 to extend, and the valve body is in the backwashing state.

[0058] After the set time has elapsed, the solenoid valve is de-energized. Under the action of the reset spring, the solenoid valve core moves to reset, driving the piston 160 to retract, which in turn drives the first sealing piston 110 and the second sealing piston 120 to retract, and the valve body returns to the filtering state.

[0059] The sealing performance of the first sealing piston 110 and the second sealing piston 120 affects the overall performance. Therefore, in this application, the first sealing piston 110 and the second sealing piston 120 are sealed with the inner wall of the valve body structure using an arc surface seal, a conical surface seal, or an end face seal. A high-tolerance sealing scheme is used to improve the overall sealing effect.

[0060] Key points combined Figure 2When an arc seal is used, sealing grooves 110a and 120a are provided on the outer sides of the first sealing piston 110 and the second sealing piston 120, and high-tolerance U-shaped sealing rings, Y-shaped sealing rings or Chevron sealing rings are provided in the sealing grooves 110a and 120a.

[0061] In this embodiment, polyurethane Y-type sealing rings 110b and 120b are used for holes.

[0062] Furthermore, guide rings 110c and 120c are provided at the front ends of the first sealing piston 110 and the second sealing piston 120. The guide rings 110c and 120c are made of polytetrafluoroethylene or phenolic resin.

[0063] The drive piston 160 can also be equipped with a sealing groove 161 and a sealing ring 162 as needed.

[0064] The key combination of conical sealing solutions Figure 3-5 The first sealing piston 110 and the second sealing piston 120 are provided with a number of protrusions 171 at intervals in the middle (the figure takes the first sealing piston 110 as an example). On both sides of the protrusions 171 of the first sealing piston 110 and the second sealing piston 120, sealing grooves 111 and sealing rings 112 are respectively provided.

[0065] One end of the first sealing piston 110 and the second sealing piston 120 is provided with a conical sealing ring 180 with an inner conical hard sealing surface 181.

[0066] The boss 171 and the conical sealing ring 180 with an inner conical hard sealing surface 181 are fitted with the inner wall of the valve body structure 100 using a hole-based clearance fit, providing guidance for the first sealing piston 110 and the second sealing piston 120. The hole-based clearance fit is either H9 / f8 or H8 / f7.

[0067] In this design, the angle between the generatrix of the conical surface and the axis is Q, which is set to 5-15°. The advantage of the conical surface is that if there are impurities on the conical surface, they will be pushed away by the piston as it moves up and down, avoiding hard collisions.

[0068] At the same time, the small-angle conical surface provides a good axial position tolerance solution, such as Figure 3 The diagrams show the positional relationship between the piston O-ring and the conical surface when they just come into contact and the positional relationship at maximum compression.

[0069] Assume Q = 10°; tan10° = 0.1763

[0070] The O-ring needs to be compressed by 0.8-1.2mm (assuming a wire diameter of 5mm, the compression rate is 16-24%) to achieve a good seal.

[0071] Corresponding axial displacement (from contact to full compression):

[0072] A compression of 0.8mm requires a shaft displacement of: 0.8 / 0.1763 = 4.54mm

[0073] A 1.2mm compression requires an axial displacement of: 1.2 / 0.1763 = 6.80 mm

[0074] That is, the radial tolerance is 1.2-0.8 = 0.4mm; and the axial tolerance is 6.8-4.54 mm = 2.26mm. This can overcome the axial tolerances accumulated during the machining or installation of the sealing ring, sealing piston, and drive piston, and reduce the stringent requirements for machining accuracy.

[0075] The key combination of end face sealing solutions Figure 6-7 The first sealing piston 110 and the second sealing piston 120 are provided with several protrusions 171 at intervals in the middle.

[0076] A floating sealing seat 172 is provided between the outer side of the first sealing piston 110 and the second sealing piston 120 and the sealing ring 180b. A spring or elastic element 180 is fixed on the upper and lower sides of the first sealing piston 110 and the second sealing piston 120 near the boss 171. The free end of the spring or elastic element 180 is fixed to the floating sealing seat 172. A hard sealing surface 172a is provided on the end face of the floating sealing seat 172.

[0077] The outer sides of the first sealing piston 110 and the second sealing piston 120 are provided with sealing grooves 201, and sealing rings 202 are provided in the sealing grooves 201 to provide a seal when the floating sealing seat 172 moves.

[0078] When the first sealing piston 110 and the second sealing piston 120 push against the sealing ring 190, the sealing surfaces of the first sealing piston 110 and the second sealing piston 120 and the floating sealing seat 172 are subjected to the reaction force of the sealing ring 190, which compresses the spring or elastic element 180, thereby adaptively compensating for all machining and assembly errors and implementing effective sealing.

[0079] This invention utilizes the pressure of the system's water pump for driving, and it is desirable for the water pump to have a wide operating range (it can also be used with a head of 15m). Since the medium inside the valve body and the driving medium are the same medium and have the same pressure, it is particularly important to calculate and ensure that the driving force of the driving piston can overcome the resistance of the medium inside the valve body, frictional resistance, and gravity, thereby changing the position of the sealing piston and thus changing the working state of the valve body (switching between filtration and backwashing states).

[0080] from Figure 8The diagram shows the force diagrams during the transition from the filtration state to the backwash state (left) and the force diagrams during the transition from the backwash state to the filtration state (right).

[0081] The foregoing has shown and described the basic principles and main features of the invention and the advantages of the invention.

[0082] F-drive --- Drive piston driving force

[0083] F-resistance --- Sealed piston resistance

[0084] f-drive --- driving piston friction force

[0085] f-axis — piston rod friction force

[0086] f-Sealed piston friction force

[0087] G---Driving piston, sealing piston, and piston rod gravity

[0088] Force requirements on the left side of the diagram: Fdrive + G > Fresistance + fdrive + faxis + 2fclose

[0089] Force requirements on the right side of the diagram: Fdrive > Fresistance + fdrive + faxis + 2fclose + G

[0090] It is evident that as long as the forces on the right side of the diagram are satisfied, the forces on the left side of the diagram will certainly be satisfied as well.

[0091] Assumption:

[0092] The diameter of the drive cavity is: D drive

[0093] The diameter of the sealing piston sealing surface is: Dm (note that this value is not necessarily the inner diameter of the valve body).

[0094] The piston rod diameter is: d rod

[0095] The contact length between the drive piston and the drive chamber is: L_drive

[0096] The contact length between the piston rod and the shaft seal is: L_shaft

[0097] The length of contact between the sealing piston and the valve body cavity is: L_sealing

[0098] The outer diameter of the sealed piston guide plate is: D guide plate.

[0099] The medium driving pressure is: P, with a minimum value of 1.5 bar.

[0100] The coefficient of friction is: µ (usually µ = 0.08-0.12, we take µ = 0.1).

[0101] but:

[0102] F_drive = π / 4 * (D_drive² - d_bar²) * P

[0103] F_resistance = π / 4 * (D_density² - d_bar²) * P

[0104] f_drive = µ*π*D_drive*L_drive*P

[0105] f-axis = µ * π * d-axis * L-axis * P

[0106] 2fd = 2 * µ * π * Dd * Ld * P

[0107] Therefore, according to: Fdrive > Fresistance + fdrive + faxis + 2fdensity + G

[0108] We can roughly derive Ddrive = λDdensity (Dguide ≥ Ddensity)

[0109] Choose the appropriate pipe diameter and sealing surface diameter based on this formula.

[0110] This results in a stable backwashing multi-way valve with simple control, a large flow area leading to low pressure loss, and shortened delay. Furthermore, all components of this invention are standard products, making them easy to procure.

[0111] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A multi-way valve for automatic control of multi-media filter tanks, characterized in that, include: A valve body structure body, wherein a first inlet, a second inlet, a third inlet and a fourth inlet are provided on the side wall of the valve body structure body; The first and second imports are in different directions; The third and fourth inlets are in opposite directions; The first inlet is connected to the filter tank inlet, the second inlet is connected to the water pump outlet, the third inlet is connected to the filter tank outlet, and the fourth inlet is connected to the backwash outlet. A first sealing piston is provided in the valve body space between the first inlet and the second inlet; A second sealing piston is provided in the valve body space between the second inlet and the fourth inlet; The first sealing piston and the inner wall of the valve body structure are sealed by an arc surface, a conical surface, or an end face. The second sealing piston and the inner wall of the valve body structure are sealed by an arc surface, a conical surface, or an end face. The end of the valve body structure is connected to the drive cylinder via a partition and a mounting flange. A drive piston is provided inside the drive cylinder; The drive piston is controlled by a solenoid valve and is connected to the first sealing piston and the second sealing piston via a drive shaft; The drive chamber of the drive cylinder is provided with a first inlet / outlet and a second inlet / outlet at both ends.

2. The multi-way valve for automatic control of multi-media filter tanks as described in claim 1, characterized in that, The first, second, third, and fourth inlet pipes are connected to the valve body structure via a tee-type half-joint.

3. The multi-way valve for automatic control of multi-media filter tanks as described in claim 1, characterized in that, The drive shaft passes through the partition opening of the partition.

4. A multi-way valve for automatic control of multi-media filter tanks as described in claim 1, characterized in that, The outer sides of the first sealing piston and the second sealing piston are provided with sealing grooves, and U-shaped sealing rings, Y-shaped sealing rings or Chevron sealing rings are provided in the sealing grooves.

5. A multi-way valve for automatic control of multi-media filter tanks as described in claim 1, characterized in that, The first sealing piston and the second sealing piston are provided with several protrusions spaced apart in the middle; A sealing groove and a sealing ring are respectively provided on both sides of the boss of the first sealing piston and the second sealing piston; a sealing ring with a tapered hard sealing surface on the inner side is provided at one end of the first sealing piston and the second sealing piston. The boss and sealing ring are fitted with a clearance fit based on a hole system to the inner wall of the valve body structure, which provides guidance for the first sealing piston and the second sealing piston.

6. A multi-way valve for automatic control of multi-media filter tanks as described in claim 1, characterized in that, The first sealing piston and the second sealing piston are provided with several protrusions spaced apart in the middle, and a floating sealing seat is provided between the outer side of the first sealing piston and the second sealing piston and the sealing ring; A sealing ring is provided at one end of the first sealing piston and the second sealing piston; The first sealing piston and the second sealing piston are each fixed with a spring or elastic element on the upper and lower sides near the boss. The free end of the spring or elastic element is fixed to the floating sealing seat. The end face of the floating sealing seat is provided with a hard sealing surface. The first sealing piston and the second sealing piston are provided with sealing grooves on their outer sides, and sealing rings are provided in the sealing grooves to provide a seal when the floating sealing seat moves.

7. A multi-way valve for automatic control of multi-media filter tanks as described in claim 1, characterized in that, The clearance fit of the hole-based system is H9 / f8 or H8 / f7.

8. A multi-way valve for automatic control of multi-media filter tanks as described in claim 1, characterized in that, The valve body structure is made of stainless steel or PVC pipe.

9. A multi-way valve for automatic control of multi-media filter tanks as described in claim 1, characterized in that, The front end of the first sealing piston is provided with a guide ring, which is made of polytetrafluoroethylene or phenolic resin.

10. A multi-way valve for automatic control of a multi-media filter tank as described in claim 1, characterized in that, The partition plate has a sealing groove at the opening, and a polyurethane Y-type sealing ring is provided in the sealing groove. The mounting end of the mounting flange is provided with a filler core.

Images