Backwash filter

Abstract

The utility model discloses a backwashing filter which comprises a valve body and a valve core assembly, the valve core assembly comprises a valve core, a valve seat, a liquid inlet valve sleeve and a liquid return valve sleeve, the valve core penetrates through the valve seat, hard sealing connection is formed between the valve core and the valve seat, and the valve core and the valve seat are made of metal materials. According to the backwash filter disclosed by the utility model, the valve core and the valve seat are in hard sealing connection, the sealing performance is good, and the valve seat is not easy to damage, so that the service life can be prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine fully mechanized mining hydraulic supports, and specifically relates to a backwashing filter. Background Art

[0002] The comprehensive mechanized coal mining work in underground coal mines is facing increasing requirements for the performance and working reliability of comprehensive mechanized coal mining equipment in coal seams. The pressure fluid of the hydraulic system such as the hydraulic support of the underground coal mining face in coal mines needs to be pre-filtered through the backwash filter to prevent dirt and impurities from entering the hydraulic system such as the support, thereby further improving the service life of various hydraulic equipment.

[0003] The backwash filter includes a valve body and a valve core assembly arranged in the valve body, and the valve core assembly mainly includes a valve core and a valve pad. The valve core assembly of the existing backwash filter adopts a valve pad seal or a conical seal made of polyoxymethylene material, which has insufficient service life and environmental adaptability. The valve pad is easily damaged by repeated squeezing of the valve core, and the conical polyoxymethylene seal can also be damaged by coal slag or other hard objects, causing sealing failure, and has a short service life.

[0004] For example, the patent document of backwash filter with authorization announcement number CN207137493U discloses an automatic backwash filter, which includes a valve body, two front and rear working chambers and four front and rear upper and lower filtering chambers are opened in the valve body, a liquid inlet is connected with a working chamber, a liquid outlet is connected with a filtering chamber, the liquid inlet and the liquid outlet are arranged on the right side of the valve body, a sewage outlet is connected with the two working chambers, and the sewage outlet is arranged at the front end of the valve body; the main valve core assembly is composed of the screw sleeve and the seat sleeve through threaded connection and the valve seat and the seat sleeve interference fit, the main valve core assembly is installed in the working chamber as an integral plug-in, the filter element assembly is installed in the filtering chamber as an integral plug-in, the electromagnetic pilot valve is connected with the valve body, the check valve is installed in the valve body as a separate part, the inlet of the check valve is connected with the outlet of the electromagnetic pilot valve, and the outlet of the check valve is connected with the two working chambers. The technical solution disclosed in the patent document also cannot solve the technical problems recorded above. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a backwash filter, the purpose of which is to increase the service life.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a backwash filter, including a valve body and a valve core assembly, the valve core assembly includes a valve core, a valve seat, a liquid inlet valve sleeve and a liquid return valve sleeve, the valve core passes through the valve seat, a hard seal connection is formed between the valve core and the valve seat, and the valve core and the valve seat are made of metal material.

[0007] The valve core and the valve seat are made of 3Cr13.

[0008] The valve core assembly also includes a screw sleeve, the liquid inlet valve sleeve is located between the liquid return valve sleeve and the screw sleeve, and two ends of the liquid inlet valve sleeve are respectively threadedly connected to the liquid return valve sleeve and the screw sleeve.

[0009] The valve core assembly also includes a piston, which is located inside the screw sleeve and is fixedly connected to one end of the valve core. A return spring is arranged between the piston and the liquid inlet valve sleeve.

[0010] The piston is fixed on the valve core through a nut, and a gasket and an elastic gasket are arranged between the nut and the piston.

[0011] The liquid inlet valve sleeve is provided with a first liquid passage hole, a plurality of first liquid passage holes are provided, and an angle is formed between the axis of the first liquid passage hole and the axis of the liquid inlet valve sleeve, and the angle is an acute angle.

[0012] The liquid return valve sleeve is provided with a second liquid passage hole, a plurality of second liquid passage holes are provided, and an angle is formed between the axis of the second liquid passage hole and the axis of the liquid return valve sleeve, and the angle is an acute angle.

[0013] The liquid return valve sleeve is provided with a third liquid hole, the second liquid hole is located between the first liquid hole and the third liquid hole, a plurality of third liquid holes are provided, and an angle is formed between the axis of the third liquid hole and the axis of the liquid return valve sleeve, and the angle is an acute angle.

[0014] The backwash filter of the utility model forms a hard seal connection between the valve core and the valve seat, has good sealing performance, and the valve seat is not easily damaged, thereby prolonging the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] This specification includes the following drawings, which show the following contents:

[0016] Figure 1 It is a cross-sectional view of the backwash filter of the utility model;

[0017] Figure 2 is a cross-sectional view of the valve core assembly;

[0018] Figure 3 It is a cross-sectional view of the valve core;

[0019] The markings in the figure are: 1. screw sleeve; 2. nut; 3. elastic washer; 4. gasket; 5. piston; 6. return spring; 7. liquid inlet valve sleeve; 8. valve seat; 9. valve core; 10. liquid return valve sleeve; 11. gasket; 12. valve body; 13. first liquid through hole; 14. second liquid through hole; 15. third liquid through hole; 16. filter element assembly; 17. connecting hole; 18. first rod section; 19. second rod section; 20. third rod section; 21. liquid outlet hole. DETAILED DESCRIPTION

[0020] The specific implementation methods of the utility model are further explained in detail below with reference to the accompanying drawings through the description of embodiments, with the aim of helping technicians in the field to have a more complete, accurate and in-depth understanding of the concept and technical solution of the utility model and facilitating its implementation.

[0021] It should be noted that, in the following embodiments, the “first”, “second” and “third” mentioned do not represent an absolute distinction in structure and / or function, nor do they represent a sequence of execution, but are merely for the convenience of description.

[0022] like Figure 1 and Figure 2 As shown, the utility model provides a backwash filter, including a valve body 12, a filter element assembly 16 and a valve core assembly. The valve core assembly includes a valve core 9, a valve seat 8, a liquid inlet valve sleeve 7 and a liquid return valve sleeve 10. The valve core 9 passes through the valve seat 8, and a hard seal connection is formed between the valve core 9 and the valve seat 8. The valve core 9 and the valve seat 8 are made of metal.

[0023] Specifically, if Figure 1 As shown, a first valve chamber and a second valve chamber are arranged in the valve body 12, a filter element assembly 16 is arranged in the first valve chamber, a valve core assembly is arranged in the second valve chamber, an axis of the first valve chamber and an axis of the second valve chamber are parallel, a connecting hole 17 connecting the first valve chamber and the second valve chamber is arranged in the valve body 12, and the connecting hole 17 is located between the first valve chamber and the second valve chamber.

[0024] like Figure 2 As shown, the valve core assembly also includes a screw sleeve 1, which is threadedly connected to the valve body 12. The screw sleeve 1 is a structure with an open end, a closed end and a hollow interior. The liquid inlet valve sleeve 7 and the liquid return valve sleeve 10 are structures with open ends and a hollow interior. The valve core 9, the valve seat 8, the screw sleeve 1, the liquid inlet valve sleeve 7 and the liquid return valve sleeve 10 are coaxially arranged. The liquid inlet valve sleeve 7 is located between the liquid return valve sleeve 10 and the screw sleeve 1. The two ends of the liquid inlet valve sleeve 7 are threadedly connected to the liquid return valve sleeve 10 and the screw sleeve 1 respectively, and internal threads are arranged at both ends of the liquid inlet valve sleeve 7.

[0025] Preferably, the valve core 9 and the valve seat 8 are made of metal material, and preferably 3Cr13. Compared with the seal of soft material, the hard seal not only has good sealing performance, but also can withstand ultra-high pressure, and prolong the service life of the valve core assembly. The valve core 9 is provided with a first outer sealing surface in contact with the valve seat 8, and the valve seat 8 is provided with a first inner sealing surface in contact with the first outer sealing surface. Both the first outer sealing surface and the first inner sealing surface are conical surfaces and are coaxially arranged.

[0026] like Figure 2As shown, the valve core assembly also includes a piston 5, which is located inside the screw sleeve 1. The piston 5 is fixedly connected to one end of the valve core 9, and a reset spring 6 is arranged between the piston 5 and the liquid inlet valve sleeve 7. The screw sleeve 1 is sleeved on the piston 5, and the reset spring 6 is sleeved on the valve core 9. The piston 5 and the valve core 9 are coaxially arranged. The piston 5 is fixed to the valve core 9 through a nut 2. A gasket 4 and an elastic gasket 113 are arranged between the nut 2 and the piston 5, and the valve core 9 and the piston 5 move synchronously.

[0027] like Figure 2 and Figure 3 As shown, the valve core 9 includes a first rod segment 18, a second rod segment 19 and a third rod segment 20 connected in sequence. The first rod segment 18, the second rod segment 19 and the third rod segment 20 are all cylindrical and coaxially arranged. The diameters of the first rod segment 18, the second rod segment 19 and the third rod segment 20 are gradually increased. The first rod segment 18 is threadedly connected to the nut 2. The piston 5 is sleeved on the first rod segment 18. The piston 5 is clamped between the nut 2 and the end surface of the second rod segment 19. The outer diameter of the second rod segment 19 is smaller than the diameter of the center hole of the valve seat 8. The liquid inlet valve sleeve 7 and the reset spring 6 are sleeved on the second rod segment 19. The reset spring 6 is a cylindrical helical spring and a compression spring. The third rod segment 20 cooperates with the valve seat 8. The first end of the third rod segment 20 is provided with a first external sealing surface. The second end of the third rod segment 20 is provided with a second external sealing surface. The first end and the second end of the third rod segment 20 are opposite ends of the second rod segment 19 in the axial direction.

[0028] like Figure 2 As shown, the first liquid passage hole 13 is provided on the liquid inlet valve sleeve 7. The first liquid passage hole 13 is provided in plurality. The first liquid passage hole 13 is a through hole radially penetrating the annular side wall of the liquid inlet valve sleeve 7. The first liquid passage hole 13 is a circular hole. The axis of the first liquid passage hole 13 and the axis of the liquid inlet valve sleeve 7 have an angle, and the angle is an acute angle. The second liquid passage hole 14 is provided on the liquid return valve sleeve 10. The second liquid passage hole 14 is provided in plurality. The second liquid passage hole 14 is a through hole radially penetrating the annular side wall of the liquid return valve sleeve 10. The second liquid passage hole 14 is a circular hole. The axis of the second liquid passage hole 14 and the axis of the liquid return valve sleeve 10 have an angle, and the angle is an acute angle. The third liquid passage hole 15 is provided on the liquid return valve sleeve 10. The second liquid passage hole 14 is located between the first liquid passage hole 13 and the third liquid passage hole 15. The second liquid passage hole 14 and the third liquid passage hole 15 are connected to the connecting hole 17. A plurality of third liquid holes 15 are provided, and the third liquid holes 15 are through holes radially penetrated on the annular side wall of the liquid return valve sleeve 10. The third liquid holes 15 are circular holes, and an angle is formed between the axis of the third liquid hole 15 and the axis of the liquid return valve sleeve 10, and the angle is an acute angle. The first liquid hole 13, the second liquid hole 14, and the third liquid hole 15 are designed with inclined holes, so that the liquid flows out more smoothly, the resistance loss is smaller, and it is easy to process.

[0029] like Figures 1 to 3As shown, a valve pad is arranged between the liquid return valve sleeve 10 and the valve body 12, and the material of the valve pad is polyoxymethylene. A liquid outlet 21 is arranged inside the valve body 12. After the second outer sealing surface contacts the valve pad, sealing is achieved, and the liquid outlet 21 cannot be connected to the connecting hole 17 through the third liquid hole 15, so that the first valve cavity is not connected to the liquid outlet 21, and the liquid in the first valve cavity cannot enter the liquid outlet 21. The valve core 9 is separated from the valve seat 8, and the first liquid hole 13 is in a connected state with the second liquid hole 14. The second outer sealing surface is a conical surface, the second outer sealing surface is coaxial with the first outer sealing surface, and the outer edge of the second outer sealing surface is connected to the outer cylindrical surface of the third rod segment 20.

[0030] After the valve seat 8 contacts the first outer sealing surface of the valve core 9 , the first liquid passage hole 13 and the second liquid passage hole 14 are in a disconnected state, and the third liquid passage hole 15 and the liquid outlet hole 21 are in a connected state.

[0031] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A backwash filter, comprising a valve body and a valve core assembly, wherein the valve core assembly comprises a valve core, a valve seat, a liquid inlet valve sleeve and a liquid return valve sleeve, and is characterized in that: The valve core passes through the valve seat, and a hard sealing connection is formed between the valve core and the valve seat. The valve core and the valve seat are made of metal material.

2. The backwash filter according to claim 1, characterized in that: The valve core and the valve seat are made of 3Cr13.

3. The backwash filter according to claim 1, characterized in that: The valve core assembly also includes a screw sleeve, the liquid inlet valve sleeve is located between the liquid return valve sleeve and the screw sleeve, and two ends of the liquid inlet valve sleeve are respectively threadedly connected to the liquid return valve sleeve and the screw sleeve.

4. The backwash filter according to claim 3, characterized in that: The valve core assembly also includes a piston, which is located inside the screw sleeve and is fixedly connected to one end of the valve core. A return spring is arranged between the piston and the liquid inlet valve sleeve.

5. The backwash filter according to claim 4, characterized in that: The piston is fixed on the valve core through a nut, and a gasket and an elastic gasket are arranged between the nut and the piston.

6. The backwash filter according to any one of claims 1 to 5, characterized in that: The liquid inlet valve sleeve is provided with a first liquid passage hole, a plurality of first liquid passage holes are provided, and an angle is formed between the axis of the first liquid passage hole and the axis of the liquid inlet valve sleeve, and the angle is an acute angle.

7. The backwash filter according to claim 6, characterized in that: The liquid return valve sleeve is provided with a second liquid passage hole, a plurality of second liquid passage holes are provided, and an angle is formed between the axis of the second liquid passage hole and the axis of the liquid return valve sleeve, and the angle is an acute angle.

8. The backwash filter according to claim 7, characterized in that: The liquid return valve sleeve is provided with a third liquid hole, the second liquid hole is located between the first liquid hole and the third liquid hole, a plurality of third liquid holes are provided, and an angle is formed between the axis of the third liquid hole and the axis of the liquid return valve sleeve, and the angle is an acute angle.

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