Non-return filtering device

Abstract

The utility model discloses a non-return filtering device which comprises a non-return filtering assembly body, connecting flanges are fixedly installed at the two ends of the non-return filtering assembly body, and the non-return filtering assembly body is fixed to a lift pipe in a threaded connection mode through the connecting flanges at the two ends of the non-return filtering assembly body. The check filter assembly body is composed of a valve body, a valve lining, a release space, a limiting space, a locking space, a metal ball, an outer lining and a filter screen, the two ends of the valve body are fixedly connected with flanges in a welded mode, and meanwhile the valve lining is fixedly installed in the valve body. According to the non-return filtering device, the non-return assembly in the non-return filtering assembly body is composed of the valve lining and the outer lining, the structure is simple, accessories are fast and convenient to replace, and the non-return filtering device is not prone to damage; the filter screen is mounted on the upper side of the interior of the non-return filter assembly body, and the filter screen is arranged, so that an auxiliary agent passing through the interior of the non-return filter assembly body can be filtered, the purity of the auxiliary agent is improved, the filter function of the non-return filter assembly body is increased, and the non-return filter assembly is more practical.

Description

Technical Field

[0001] The utility model relates to the field of chemical equipment, in particular to a non-return filtering device. Background Art

[0002] Phosphoric acid produced by decomposing phosphate rock with sulfuric acid, nitric acid or hydrochloric acid is collectively called wet-process phosphoric acid. The production process of wet-process phosphoric acid can be divided into anhydrous process, semi-hydrate process and dihydrate process. The amount of sulfuric acid, nitric acid or hydrochloric acid added when decomposing phosphate rock needs to be controlled. Therefore, a batching device is required to increase the amount of additives added so that the reaction proceeds normally and the reaction effect is achieved;

[0003] When the configured phosphoric acid additive is transported inside the pipeline of a chemical plant, it is usually necessary to transport the additive from a low position to a high position through a vertical lift pipe. When the delivery pump stops working, in order to avoid the backflow of the additive inside the vertical lift pipe, a check valve will be installed on the lift pipe. Traditional check valves: According to the structure, they can be divided into three types: lift check valves, swing check valves and butterfly check valves; lift check valves can be divided into vertical and straight-through types; swing check valves can be divided into single-flap, double-flap and multi-flap types; butterfly check valves are butterfly double-flap and butterfly single-flap; although the above-mentioned types of check valve bodies have a good effect of checking backflow, their structures are relatively complex and have no filtering function, which limits the functionality of the check valve and is also prone to damage. Utility Model Content

[0004] The purpose of the utility model is to provide a non-return filtering device to solve the defects mentioned in the above background technology.

[0005] To achieve the above-mentioned purpose, a check filter device is provided, comprising a check filter assembly body, both ends of the check filter assembly body are fixedly installed with connecting flanges, and the check filter assembly body is screwed and fixed on the lift pipe through the connecting flanges at both ends, the check filter assembly body is composed of a valve body, a valve liner, a release space, a limit space, a locking space, a metal ball, an outer bushing and a filter screen, and both ends of the valve body are welded and fixed with connecting flanges, and the valve liner is fixedly installed inside the valve body, and a limit space is provided inside the valve liner, and a release space is provided on the upper side of the limit space, and a locking space is provided on the lower side of the limit space, and the outer bushing is clamped inside the locking space;

[0006] The inner upper side of the valve body is threadedly connected with a fixing seat, and a mounting frame is positioned on the fixing seat, and a filter screen is installed on the inner wall of the mounting frame.

[0007] Preferably, a limiting groove matching the size of the limiting piece is provided on the fixed portion of the valve liner, and both ends of the limiting piece are clamped in the limiting groove and fixed by bolts.

[0008] Preferably, the axial cross-sections of the release space, the limiting space and the locking space are concentric circle structures, and the diameter of the release space is larger than the diameter of the limiting space, and the diameter of the limiting space is larger than the diameter of the locking space.

[0009] Preferably, the cross-sectional surfaces of the release space and the locking space are dovetail-shaped, and the cross-sectional surface of the limiting space is rectangular. At the same time, the outer sleeve is clamped on the upper part of the locking space, and the check filter assembly body is in a locked state, and a liquid inlet is opened at the bottom of the locking space.

[0010] Preferably, the outer bushing is a spherical structure made of rubber material, and a metal ball is fixedly arranged at the inner center position of the outer bushing, and the cross-section of the metal ball and the outer bushing is a concentric circle structure.

[0011] Preferably, the end of the fixing seat is set in an "L" shape, and the fixing seat as a whole is a circular ring. At the same time, the fixing seat and the installation frame are concentric circle structures, and the installation frame is clamped on the fixing seat and fixed by bolts.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the check assembly inside the check filter assembly body is composed of a valve liner and an outer sleeve, which has a simple structure, is quick and convenient to replace accessories, and is not easy to be damaged;

[0013] A filter screen is installed on the upper side of the non-return filter assembly body. The setting of the filter screen can filter the additives passing through the non-return filter assembly body, improve the purity of the additives, increase the filtering function of the non-return filter assembly body, and be more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the position of the main body of the non-return filter assembly of the utility model structure;

[0015] Figure 2 This is a schematic diagram of the structure of the non-return filter assembly of the utility model;

[0016] Figure 3 The utility model structure Figure 2 AA section structure schematic diagram in;

[0017] Figure 4 The utility model structure Figure 2 Schematic diagram of the BB cross-section structure.

[0018] Numbers in the figure: 1. Check filter assembly body; 11. Connecting flange; 12. Valve body; 13. Valve lining; 14. Release space; 15. Limit space; 16. Locking space; 17. Liquid inlet; 18. Metal ball; 19. Outer sleeve; 20. Limit plate; 21. Fixed seat; 22. Installation frame; 23. Filter screen; 2. Lift pipe. DETAILED DESCRIPTION

[0019] See also Figure 1-4 The utility model provides a non-return filter device, comprising a non-return filter assembly body 1, both ends of the non-return filter assembly body 1 are fixedly installed with connecting flanges 11, and the non-return filter assembly body 1 is screwed and fixed on the lift pipe 2 through the connecting flanges 11 at both ends, and is characterized in that: the non-return filter assembly body 1 is composed of a valve body 12, a valve liner 13, a release space 14, a limit space 15, a locking space 16, a metal ball 18, an outer bushing 19 and a filter screen 23, and both ends of the valve body 12 are welded and fixed with the connecting flanges 11, and the valve liner 13 is fixedly installed inside the valve body 12, the limit space 15 is opened inside the valve liner 13, and the release space 14 is opened on the upper side of the limit space 15, and the locking space 16 is opened on the lower side of the limit space 15, and the outer bushing 19 is clamped inside the locking space 16;

[0020] The upper inner side of the valve body 12 is threadedly connected to a fixing seat 21 , and a mounting frame 22 is positioned on the fixing seat 21 , while a filter screen 23 is installed on the inner wall of the mounting frame 22 .

[0021] Working principle: When in use, under the action of the booster pump, the phosphate additive enters the interior of the lift pipe 2 when being transported by the booster pump, and the low-position additive is transported to a high position through the lift pipe 2. When the booster pump is turned off, the setting of the check filter assembly body 1 can check the additive inside the lift pipe 2 to prevent the additive from flowing back.

[0022] As a preferred embodiment, a limiting groove matching the size of the limiting piece 20 is provided at the fixed portion of the valve liner 13, and both ends of the limiting piece 20 are clamped inside the limiting groove and fixed by bolts.

[0023] like Figure 1-2 As shown: the working mode of the check filter assembly body 1 is: when the auxiliary agent moves from bottom to top inside the lift pipe 2, the auxiliary agent impacts the bottom of the outer sleeve 19 and overcomes the gravity of the outer sleeve 19, so that the outer sleeve 19 moves upward and moves to the inside of the release space 14. A flow space is formed between the release space 14 and the outer sleeve 19. Through this flow space, the auxiliary agent can flow smoothly inside the lift pipe 2.

[0024] As a preferred embodiment, the axial cross-sections of the release space 14 , the limiting space 15 and the locking space 16 are concentric circle structures, and the diameter of the release space 14 is larger than the diameter of the limiting space 15 , while the diameter of the limiting space 15 is larger than the diameter of the locking space 16 .

[0025] like Figure 1-2As shown: when the pump is turned off, the additive located inside the pipe above the check filter assembly body 1 impacts the upper surface of the outer sleeve 19, so that the outer sleeve 19 is stuck on the inner upper side of the locking space 16, so that the locking space 16 is in a locked state, avoiding backflow of the pipe inside the lift pipe 2.

[0026] As a preferred embodiment, the cross-sectional surfaces of the release space 14 and the locking space 16 are dovetail-shaped, and the cross-sectional surface of the limiting space 15 is rectangular. At the same time, the outer sleeve 19 is clamped on the upper part of the locking space 16, and the check filter assembly body 1 is in a locked state, and a liquid inlet 17 is opened at the bottom of the locking space 16.

[0027] like Figure 1-2 As shown: the cross-section of the release space 14 and the locking space 16 is arranged in a dovetail shape;

[0028] When the outer sleeve 19 moves upward to the inside of the release space 14, the check filter assembly body 1 is in a connected state;

[0029] When the outer sleeve 19 moves downward to the upper position inside the locking space 16, the non-return filter assembly body 1 is in a locked state.

[0030] As a preferred embodiment, the outer bushing 19 is a spherical structure made of rubber material, and a metal ball 18 is fixedly arranged at the inner center position of the outer bushing 19, and the cross-section of the metal ball 18 and the outer bushing 19 is a concentric circle structure.

[0031] like Figure 2 As shown: the check assembly inside the check filter assembly body 1 is composed of a valve liner 13 and an outer sleeve 19, which has a simple structure, is quick and convenient to replace accessories, and is not easy to damage.

[0032] As a preferred embodiment, the end of the fixing seat 21 is set in an "L" shape, and the fixing seat 21 is annular as a whole. At the same time, the fixing seat 21 and the installation frame 22 are concentric circle structures, and the installation frame 22 is clamped on the fixing seat 21 and fixed by bolts.

[0033] like Figure 1-4 As shown: a filter screen 23 is installed on the upper side of the non-return filter assembly body 1. The setting of the filter screen 23 can filter the additives passing through the non-return filter assembly body 1, improve the purity of the additives, increase the filtering function of the non-return filter assembly body 1, and be more practical;

[0034] The outer bushing 19 is made of corrosion-resistant rubber material. When replacing the outer bushing 19, the fixing seat 21 and the limit plate 20 can be removed and replaced with new accessories to ensure that other parts can continue to be used without damage, thereby increasing the service life of the check filter assembly body 1.

Claims

1. A non-return filter device, comprising a non-return filter assembly body (1), both ends of the non-return filter assembly body (1) are fixedly mounted with connecting flanges (11), and the non-return filter assembly body (1) is screwed and fixed to a lift pipe (2) through the connecting flanges (11) at both ends, characterized in that: The check filter assembly body (1) is composed of a valve body (12), a valve liner (13), a release space (14), a limit space (15), a locking space (16), a metal ball (18), an outer bushing (19) and a filter screen (23), and both ends of the valve body (12) are welded with a fixed connection flange (11), and the valve liner (13) is fixedly installed inside the valve body (12), and a limit space (15) is provided inside the valve liner (13), and a release space (14) is provided on the upper side of the limit space (15), and a locking space (16) is provided on the lower side of the limit space (15), and the outer bushing (19) is clamped inside the locking space (16); The inner upper side of the valve body (12) is threadedly connected to a fixing seat (21), and a mounting frame (22) is positioned on the fixing seat (21), and a filter screen (23) is installed on the inner wall of the mounting frame (22).

2. A non-return filter device according to claim 1, characterized in that: The fixed portion of the valve liner (13) is provided with a limiting groove matched with the size of the limiting piece (20), and the two ends of the limiting piece (20) are clamped inside the limiting groove and fixed by bolts.

3. A non-return filter device according to claim 1, characterized in that: The axial cross-sections of the release space (14), the limiting space (15) and the locking space (16) are concentric circle structures, and the diameter of the release space (14) is larger than the diameter of the limiting space (15), while the diameter of the limiting space (15) is larger than the diameter of the locking space (16).

4. A non-return filter device according to claim 3, characterized in that: The cross-sectional surfaces of the release space (14) and the locking space (16) are dovetail-shaped, and the cross-sectional surface of the limiting space (15) is rectangular. At the same time, the outer bushing (19) is clamped on the upper part of the locking space (16) so that the check filter assembly body (1) is in a locked state, and a liquid inlet (17) is opened at the bottom of the locking space (16).

5. A non-return filter device according to claim 1, characterized in that: The outer bushing (19) is a spherical structure made of rubber material, and a metal ball (18) is fixedly arranged at the inner center position of the outer bushing (19), and the cross-sections of the metal ball (18) and the outer bushing (19) are concentric circle structures.

6. A non-return filter device according to claim 1, characterized in that: The end of the fixing seat (21) is arranged in an "L" shape, and the fixing seat (21) as a whole is in a circular ring shape. At the same time, the fixing seat (21) and the installation frame (22) are concentric circle structures, and the installation frame (22) is clamped on the fixing seat (21) and fixed by bolts.

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