Backwashing filtration device and backwashing filtration method

Abstract

The invention discloses a backwashing filtering device, comprising a valve body, wherein a valve stem is provided in the vertical direction of the valve body, a compression spring is provided at the lower end of the valve stem, the upper end of the compression spring is clamped with the valve stem, and a spring clamp seat is provided at the lower end of the compression spring; an oil guide gap is provided between the lower end of the valve stem and the spring clamp seat; an oil port A, an oil port B, an oil port C and an oil port D are provided in the valve body in a horizontal direction from top to bottom; an oil inlet and a filter element A are also provided at both ends of the valve body, respectively, a filter element B is provided below the filter element A, an oil guide port is provided at the lower end of the filter element B, and the oil guide port is connected with one end of the oil port D; an oil outlet is provided at the bottom of the valve body, and the oil outlet is connected with the other end of the oil port D; the invention also discloses a backwashing filtering method, which not only solves the problem that the handle of the existing backwashing filtering device is difficult to move in a high-pressure system, but also solves the problem that the backwashing effect of the existing backwashing device is poor in a low-pressure system.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic systems and relates to a backwashing filtering device. The invention also relates to a method for backwashing filtering using the device. Background Art

[0002] Existing backwash filters generally use ball valves to complete their work, but in high-pressure systems, it becomes extremely difficult to turn the ball valve handle, and sometimes it is even necessary to knock the handle to complete the working process of the backwash filter. In low-pressure systems, such as cooling systems, when using traditional backwash filters, their liquid outlets will still be open, which will cause the working medium to be diverted, greatly reducing the backwashing effect. Summary of the invention

[0003] The purpose of the present invention is to provide a backwashing filter device, which not only solves the problem that the handle of the existing backwashing filter device is difficult to move in a high-pressure system, but also solves the problem that the backwashing effect of the existing backwashing device is poor in a low-pressure system.

[0004] The object of the present invention is also to provide a backwash filtration method.

[0005] The first technical solution adopted by the present invention is a backwashing filter device, comprising a valve body, a valve stem is provided in the valve body along the vertical direction, a compression spring is provided at the lower end of the valve stem, the upper end of the compression spring is clamped with the valve stem, and a spring clamp seat is provided at the lower end of the compression spring; an oil guide gap is provided between the lower end of the valve stem and the spring clamp seat;

[0006] The valve body is provided with oil ports A, B, C and D in the horizontal direction from top to bottom;

[0007] A filter element A is provided on one side of the valve body, a filter element B is provided below the filter element A, the filter element A is communicated with the filter element B, an oil guide port is provided at the lower end of the filter element B, and the oil guide port is communicated with one end of the oil port D;

[0008] An oil outlet is provided at the bottom of the valve body, and the oil outlet is connected to the other end of the oil port D;

[0009] An oil guide groove is coaxially arranged on the rod body of the valve stem.

[0010] The first technical solution of the present invention is also characterized in that:

[0011] A handle seat is arranged on the top of the valve body, and the handle seat is connected to one end of the handle through a pin shaft.

[0012] One end of the handle connected to the handle seat is provided with a pressing block, and the pressing block contacts the upper end of the valve stem.

[0013] A sealing ring is provided at the contact point between the valve stem and the valve body.

[0014] The volume of filter element A is smaller than the volume of filter element B.

[0015] The second technical solution adopted by the present invention is a backwashing filtration method of a backwashing filtration device, which specifically includes the following process:

[0016] When backwashing and filtration are required, the handle is pushed upwards, and the valve stem is moved downwards through the pressure block, thereby opening oil ports A and C and closing oil ports B and D. At this time, when the working medium enters the valve body from oil port A, and then enters filter element A through the upper part of the valve stem, impurities are left on the outer wall of filter element A, and the clean working medium enters the inside of filter element B from the inside of filter element A, and then the impurities attached to the outer wall of filter element B are washed away, and the washed impurities enter oil port C from the oil guide groove on the valve stem, and rush out of the valve body from oil port C; when the handle is released, the valve stem is restored to its original position by compressing the spring.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. Realizes the simple operation of backwashing filter in high pressure system;

[0019] 2. The recoil effect in the low pressure system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a backwashing filtration device of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of a valve body in a backwashing filter device of the present invention;

[0022] Figure 3 It is a schematic diagram of the working state of a backwashing filter device in a normal mode of the present invention;

[0023] Figure 4 It is a schematic diagram of the working state of a backwashing filter device in a backwashing mode according to the present invention.

[0024] In the figure, 1. handle seat, 2. valve body, 3. valve stem, 4. compression spring, 5. filter element A, 6. filter element B, 7. handle, 8. spring seat, 9. oil guide gap, 10. oil port A, 11. oil port B, 12. oil port C, 13. oil port D, 15. oil guide port, 17. oil outlet, 18. oil guide groove, 19. pressure block, 20. sealing ring. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] The present invention provides a backwashing filter device, such as Figure 1 ,2 As shown, it includes a valve body 2, a valve stem 3 is arranged in the vertical direction in the valve body 2, a compression spring 4 is arranged at the lower end of the valve stem 3, the upper end of the compression spring 4 is clamped with the valve stem 3, and a spring seat 8 is arranged at the lower end of the compression spring 4; an oil guide gap 9 is arranged between the lower end of the valve stem 3 and the spring seat 8; an oil port A10, an oil port B11, an oil port C12 and an oil port D13 are arranged in the valve body 2 from top to bottom in the horizontal direction; a filter element A5 is arranged on one side of the valve body 2, a filter element B6 is arranged below the filter element A5, the filter element A5 is connected with the filter element B6, an oil guide port 15 is arranged at the lower end of the filter element B6, and the oil guide port 15 is connected with one end of the oil port D13; an oil outlet 17 is arranged at the bottom of the valve body 2, and the oil outlet 17 is connected with the other end of the oil port D13; an oil guide groove 18 is also coaxially opened on the rod body of the valve stem 3. A handle seat 1 is arranged at the top of the valve body 3, and the handle seat 1 is connected to one end of the handle 7 through a pin shaft. A pressure block 19 is provided at one end of the handle 7 connected to the handle seat 1, and the pressure block 19 contacts the upper end of the valve stem 3. A sealing ring 20 is provided at the contact point between the valve stem 3 and the valve body 2. The volume of the filter element A5 is smaller than that of the filter element B7 (i.e., the filter element A5 is a small filter element, and the filter element B6 is a large filter element).

[0027] A backwashing filtration method of a backwashing filtration device of the present invention is:

[0028] like Figure 3 As shown, when the hydraulic system is working normally, the working medium enters the valve body 2 from the oil port A10, then enters the middle of the valve stem 3 through the oil port B11, and then enters the filter element B6 from the oil guide groove 18 on the valve stem 3, while the impurities in the medium remain on the outer wall of the filter element B6. Then, the working medium flows from the oil guide port 15 at the lower end of the filter element B6 through the oil guide gap 9 at the lower end of the valve stem 3, passes through the spring 4, enters the oil port D13, and then enters the hydraulic system from the oil outlet 17. Due to the existence of the compression spring (4), the valve stem (3) is always in a state of being compressed under normal circumstances. Figure 3 The state shown (this state is the normal working mode of the hydraulic system).

[0029] like Figure 4 As shown, when backwashing and filtering are required, the handle 7 is pushed upward, and the valve stem 3 is moved downward through the pressing block 19, so that the oil ports A10 and C12 are opened, and the oil ports B11 and D13 are closed. At this time, when the working medium enters the valve body 2 from the oil port A10, and then enters the filter element A5 through the upper part of the valve stem 3, the impurities are left on the outer wall of the filter element A5, and the clean working medium enters the inside of the filter element B6 from the inside of the filter element A5, and then the impurities attached to the outer wall of the filter element B6 are washed away, and the washed impurities enter the oil port C12 from the oil guide groove 18 on the valve stem 3, and rush out of the valve body 2 from the oil port C12; when the handle 7 is released, the valve stem 3 is restored to its original position by compressing the spring 4. The device can also use other control methods such as hydraulic control, electric control and pneumatic control to complete the movement of the valve stem 3.

Claims

1. A backwashing filtration method for a backwashing filtration device, characterized in that: A backwashing filter device is used, comprising a valve body, a valve stem is arranged in the vertical direction in the valve body, a compression spring is arranged at the lower end of the valve stem, the upper end of the compression spring is clamped with the valve stem, and a spring clamp seat is arranged at the lower end of the compression spring; an oil guide gap is arranged between the lower end of the valve stem and the spring clamp seat; The valve body is provided with oil ports A, B, C and D in the horizontal direction from top to bottom; A filter element A is provided on one side of the valve body, a filter element B is provided below the filter element A, the filter element A is communicated with the filter element B, an oil guide port is provided at the lower end of the filter element B, and the oil guide port is communicated with one end of the oil port D; An oil outlet is provided at the bottom of the valve body, and the oil outlet is connected to the other end of the oil port D; An oil guide groove is coaxially provided on the stem body of the valve stem; The top end of the valve body is provided with a handle seat, and the handle seat is connected to one end of the handle through a pin shaft; A pressing block is provided at one end of the handle connected to the handle seat, and the pressing block contacts the upper end of the valve stem; A sealing ring is provided at the contact point between the valve stem and the valve body; The volume of the filter element A is smaller than the volume of the filter element B; The specific process includes the following: When the hydraulic system is working normally, the working medium enters the valve body from the oil port A, then enters the middle of the valve stem through the oil port B, and then enters the filter element B from the oil guide groove on the valve stem, while the impurities in the medium remain on the outer wall of the filter element B. Then the working medium flows from the oil guide port at the lower end of the filter element B through the oil guide gap at the lower end of the valve stem, passes through the compression spring, enters the oil port D, and then enters the hydraulic system from the oil outlet; When backwashing and filtration are required, the handle is pushed upwards, and the valve stem is moved downwards through the pressure block, thereby opening oil ports A and C and closing oil ports B and D. At this time, when the working medium enters the valve body from oil port A, and then enters filter element A through the upper part of the valve stem, impurities are left on the outer wall of filter element A, and the clean working medium enters the inside of filter element B from the inside of filter element A, and then the impurities attached to the outer wall of filter element B are washed away, and the washed impurities enter oil port C from the oil guide groove on the valve stem, and rush out of the valve body from oil port C; when the handle is released, the valve stem is restored to its original position by compressing the spring.

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