Corrosion resistant circulating pump

Abstract

The utility model discloses a kind of corrosion-resistant circulating pumps, including pump shell, the outer wall of the pump shell is provided with water outlet pipe, the flange of the front wall opening of the pump shell is connected with shell cover, the outer wall of the shell cover is provided with water inlet pipe, the rear wall of the pump shell is provided with connecting pipe, pump shaft is arranged in the connecting pipe, PTFE lining shell and PTFE lining cover are arranged in the pump shell, the rear end of the PTFE lining shell extends into the connecting pipe and is attached with the inner wall of connecting pipe, the outer wall of the PTFE lining shell and PTFE lining cover integrally formed with several nuts, the inner wall of the pump shell and shell cover and the corresponding place of nut are all provided with opening groove;The corrosion resistance of the utility model is complete, the contact medium surface of pump shell, shell cover, inlet and outlet water pipe is covered by PTFE material (PTFE lining shell, PTFE lining cover, PTFE lining pipe, PTFE sleeve), PTFE material is resistant to strong acid and strong base, resistant to organic solvent, can be adapted to most corrosive medium transport, solve the problem of traditional pump body corrosion failure.

Description

Technical Field

[0001] This utility model relates to the field of circulating pump technology, specifically a corrosion-resistant circulating pump. Background Technology

[0002] Currently, circulating pumps are widely used in industries such as chemical, electroplating, and pharmaceuticals to transport corrosive media such as acid and alkali solutions and salt solutions. Existing corrosion protection methods for circulating pumps mainly include two types: integral corrosion-resistant material casting (such as fluoroplastic pumps) and fixed internal linings within the pump casing (such as rubber or PTFE linings).

[0003] However, existing technologies have obvious drawbacks:

[0004] 1. The integral fluoroplastic pump has high cost, poor impact resistance, and is prone to cracking after long-term use;

[0005] 2. The lining of a fixed-line pump is usually integrally molded or bonded, and cannot be disassembled and replaced separately. Once the lining is worn or corroded, the entire pump casing needs to be replaced, resulting in high maintenance costs.

[0006] Therefore, we propose a corrosion-resistant circulating pump. Utility Model Content

[0007] The purpose of this invention is to provide a corrosion-resistant circulating pump to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A corrosion-resistant circulating pump includes a pump casing, an outlet pipe on the outer peripheral wall of the pump casing, a casing cover flanged at the front opening of the pump casing, an inlet pipe on the outer wall of the casing cover, a connecting pipe on the rear wall of the pump casing, a pump shaft passing through the connecting pipe, a PTFE inner liner and a PTFE inner cover inside the pump casing, the rear end of the PTFE inner liner extending into the connecting pipe and fitting against the inner wall of the connecting pipe, several nuts integrally formed on the outer walls of the PTFE inner liner and the PTFE inner cover, opening grooves corresponding to the nuts on the inner walls of the pump casing and the casing cover, the nuts being located in the corresponding opening grooves, and multiple bolts passing through the outer walls of both the pump casing and the casing cover. The bolts are connected with corresponding nuts. PTFE inner lining tubes are installed inside both the outlet and inlet pipes. The PTFE inner lining shell and PTFE inner lining cover are detachably and sealingly connected to the corresponding PTFE inner lining tubes. A PTFE sleeve is fixedly fitted onto the outer wall of the pump shaft. One end of the pump shaft and the PTFE sleeve is inserted into the PTFE inner lining shell through a connecting pipe. A stainless steel sleeve is fixedly fitted onto the end of the PTFE sleeve located inside the PTFE inner lining shell. A stainless steel impeller is detachably installed on the outer wall of the stainless steel sleeve. The PTFE sleeve is sealed to the PTFE inner lining shell. A bearing bracket is rotatably connected to the outer wall of the pump shaft through a bearing. The bearing bracket is connected to the rear flange of the pump casing.

[0010] As a further embodiment of this utility model: an outlet is provided on the PTFE inner liner shell at the position corresponding to the outlet pipe, an inlet is provided on the PTFE inner liner cover at the position corresponding to the inlet pipe, threaded grooves are provided on the outer wall of the PTFE inner liner shell at the position corresponding to the outlet and on the outer wall of the PTFE inner liner cover at the position corresponding to the inlet, the end of the PTFE inner liner tube is threadedly connected to the corresponding threaded groove, and a first sealing ring is embedded between the contact surfaces of the PTFE inner liner shell and the PTFE inner liner cover and the corresponding PTFE inner liner tube.

[0011] As a further aspect of this utility model, a plurality of second sealing rings are embedded and installed between the contact surfaces of the PTFE inner liner cover and the PTFE inner liner shell.

[0012] As a further embodiment of this utility model: the stainless steel sleeve and the stainless steel impeller are connected by a flat key. The inner wall of the stainless steel impeller and the outer wall of the stainless steel sleeve are both provided with keyways that are compatible with the flat key. A locking screw cap is provided inside the stainless steel impeller, and the locking screw cap is threaded to the end of the pump shaft. A third sealing ring is embedded at the corresponding position of the inner wall of the stainless steel impeller and the locking screw cap. The third sealing ring fits against the outer wall of the locking screw cap.

[0013] As a further embodiment of this utility model: the inner and outer peripheral walls of the PTFE sleeve are provided with protruding strips, the outer wall of the pump shaft and the inner wall of the stainless steel sleeve are provided with grooves that are adapted to the protruding strips, the protruding strips are located in the corresponding grooves, and the pump shaft and the stainless steel sleeve are both interference fit with the PTFE sleeve.

[0014] As a further embodiment of this utility model: a sealing packing is provided inside the PTFE inner liner shell at the corresponding position of the connecting pipe. The sealing packing is sleeved on the PTFE sleeve. A packing gland is connected to the flange at the end of the connecting pipe away from the pump shell. One end of the packing gland is inserted into the PTFE inner liner shell and is tightly abutted against the sealing packing.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The anti-corrosion performance of this utility model is thorough. The pump casing, casing cover, and inlet and outlet water pipes are all covered with PTFE material (PTFE inner liner shell, PTFE inner liner cover, PTFE inner liner pipe, PTFE sleeve). PTFE material is resistant to strong acids and alkalis and organic solvents, and can be used to transport most corrosive media, thus solving the problem of corrosion failure of traditional pump bodies.

[0017] 2. This utility model has high maintenance convenience. The PTFE inner lining components (PTFE inner lining shell and PTFE inner lining cover) are detachably connected by bolts and nuts. The PTFE inner lining tube is connected by threads and can be replaced separately after wear. There is no need to disassemble the pump body or replace the pump shell. Maintenance is convenient and the maintenance cost is low.

[0018] 3. The structure of this utility model has strong adaptability. The overall structure takes into account multiple requirements such as corrosion prevention, transmission, sealing, and disassembly. It can be widely used in the transportation of corrosive media in industries such as chemical, electroplating, pharmaceutical, and environmental protection. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a corrosion-resistant circulating pump.

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0021] Figure 3 This is a schematic diagram of the convex strip structure in a corrosion-resistant circulating pump.

[0022] The components include: pump casing 1, outlet pipe 2, casing cover 3, inlet pipe 4, PTFE inner liner shell 5, threaded groove 6, first sealing ring 7, PTFE inner liner cover 8, second sealing ring 9, PTFE inner liner tube 10, pump shaft 11, PTFE sleeve 12, stainless steel sleeve 13, raised strip 14, stainless steel impeller 15, keyway 16, flat key 17, locking screw cap 18, third sealing ring 19, bearing bracket 20, nut 21, bolt 22, connecting pipe 23, sealing packing 24, and packing gland 25. Detailed Implementation

[0023] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation in the specification, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0027] Please see Figures 1-3In this embodiment of the present invention, a corrosion-resistant circulating pump includes a pump casing 1, an outlet pipe 2 disposed on the outer peripheral wall of the pump casing 1, a casing cover 3 flanged at the opening of the front wall of the pump casing 1, an inlet pipe 4 disposed on the outer wall of the casing cover 3, a connecting pipe 23 disposed on the rear wall of the pump casing 1, a pump shaft 11 passing through the connecting pipe 23, a PTFE inner liner 5 and a PTFE inner liner cover 8 disposed inside the pump casing 1, the rear end of the PTFE inner liner 5 extending into the connecting pipe 23 and connecting with the inner wall of the connecting pipe 23. The PTFE inner liner shell 5 and PTFE inner liner cover 8 are integrally formed with several nuts 21 on their outer walls. The inner walls of the pump shell 1 and the cover 3 have opening slots corresponding to the nuts 21, with the nuts 21 located within these slots. Multiple bolts 22 are threaded through the outer walls of both the pump shell 1 and the cover 3, and these bolts 22 are connected to the corresponding nuts 21. PTFE inner liner tubes 10 are installed inside both the outlet pipe 2 and the inlet pipe 4. The PTFE inner liner shell 5 and PTFE inner liner cover 8... A PTFE sleeve 12 is fixedly fitted onto the outer wall of the pump shaft 11, which is detachably and sealed to the corresponding PTFE inner liner 10. One end of the pump shaft 11 and the PTFE sleeve 12 is inserted into the PTFE inner liner 5 via a connecting pipe 23. A stainless steel sleeve 13 is fixedly fitted onto the end of the PTFE sleeve 12 located inside the PTFE inner liner 5. A stainless steel impeller 15 is detachably installed on the outer wall of the stainless steel sleeve 13. The PTFE sleeve 12 is sealed to the PTFE inner liner 5. The outer wall of pump casing 11 is rotatably connected to a bearing bracket 20 via a bearing. The bearing bracket 20 is connected to the rear wall flange of pump casing 1. Specifically, the PTFE inner liner shell 5, PTFE inner liner cover 8, PTFE inner liner tube 10 and PTFE sleeve 12 are all made of modified PTFE material with 15% carbon fiber added, which increases its Shore hardness to D60 to improve durability. PTFE material is resistant to strong acids and alkalis and organic solvents, and can be used to transport most corrosive media, solving the problem of corrosion failure of traditional pump bodies.

[0028] By adopting the above-mentioned scheme, this utility model utilizes the PTFE inner liner 5, PTFE inner liner cover 8, and PTFE inner liner tube 10 to effectively protect the interior of the pump casing 1, casing cover 3, inlet pipe 4, and outlet pipe 2 from corrosion. Furthermore, the cooperation of nut 21 with the opening groove and bolt 22 facilitates the disassembly and assembly of the PTFE inner liner 5 or PTFE inner liner cover 8 within the pump casing 1 or casing cover 3. The PTFE sleeve 12 provides corrosion protection for the portion of the pump shaft 11 located within the pump casing 1, thereby further improving the corrosion resistance of the circulating pump and resulting in good performance.

[0029] Specific combination Figure 1In one embodiment of this utility model, an outlet is provided on the PTFE inner liner 5 at the corresponding position of the outlet pipe 2, and an inlet is provided on the PTFE inner liner 8 at the corresponding position of the inlet pipe 4. Threaded grooves 6 are provided on the outer wall of the PTFE inner liner 5 at the corresponding position of the outlet and on the outer wall of the PTFE inner liner 8 at the corresponding position of the inlet. The end of the PTFE inner liner tube 10 is threadedly connected to the corresponding threaded groove 6. A first sealing ring 7 is embedded between the contact surfaces of the PTFE inner liner 5 and the PTFE inner liner 8 and the corresponding PTFE inner liner tube 10.

[0030] The use of threaded groove 6 and threaded connection facilitates the positioning and installation of PTFE inner liner 10 in water outlet pipe 2 and water inlet pipe 4. The setting of first sealing ring 7 facilitates the sealing connection between PTFE inner liner 10, PTFE inner liner shell 5 and PTFE inner liner cover 8. In addition, threaded groove 6 can be replaced with internal threads directly opened in water inlet and water outlet, which makes processing more convenient.

[0031] Specific combination Figure 1 In one embodiment of this utility model, a plurality of second sealing rings 9 are embedded between the contact surfaces of the PTFE inner liner cover 8 and the PTFE inner liner shell 5 to ensure the sealing effect between the PTFE inner liner cover 8 and the PTFE inner liner shell 5.

[0032] Specific combination Figure 1 and Figure 2 In one embodiment of this utility model, the stainless steel sleeve 13 and the stainless steel impeller 15 are connected by a flat key 17. The inner wall of the stainless steel impeller 15 and the outer wall of the stainless steel sleeve 13 are both provided with keyways 16 that are adapted to the flat key 17. A locking screw cap 18 is provided inside the stainless steel impeller 15, and the locking screw cap 18 is threadedly connected to the end of the pump shaft 11. A third sealing ring 19 is embedded at the corresponding position of the inner wall of the stainless steel impeller 15 and the locking screw cap 18. The third sealing ring 19 fits against the outer wall of the locking screw cap 18.

[0033] The cooperation between the flat key 17 and the keyway 16 enables power transmission between the stainless steel sleeve 13 and the stainless steel impeller 15, preventing relative rotation between them. The locking cap 18 facilitates the fixing of the stainless steel impeller 15 to the pump shaft 11. The third sealing ring 19 prevents corrosive media from entering the threaded hole at the end of the pump shaft 11.

[0034] Specific combination Figure 3In one embodiment of the present invention, the inner and outer peripheral walls of the PTFE sleeve 12 are provided with protrusions 14, the outer wall of the pump shaft 11 and the inner wall of the stainless steel sleeve 13 are provided with grooves adapted to the protrusions 14, the protrusions 14 are located in the corresponding grooves, and the pump shaft 11 and the stainless steel sleeve 13 are both interference fit with the PTFE sleeve 12.

[0035] The PTFE sleeve 12 can be engaged with the pump shaft 11 and the stainless steel sleeve 13 through the cooperation of the protrusion 14 and the groove, thereby preventing relative rotation between the PTFE sleeve 12 and the pump shaft 11 or the stainless steel sleeve 13. During assembly, the PTFE sleeve 12 is heated to 80°C and then inserted into the corresponding position of the pump shaft 11. After cooling, it can be fixed by the engagement of the protrusion 14 with the groove of the pump shaft. The stainless steel sleeve 13 is cooled to -30°C and inserted into the end of the PTFE sleeve 12. After returning to room temperature, it can be fixed by the engagement of the protrusion 14 of the PTFE sleeve 12.

[0036] Specific combination Figure 1 In one embodiment of this utility model, a sealing packing 24 is provided inside the PTFE inner liner 5 at the corresponding position of the connecting pipe 23. The sealing packing 24 is sleeved on the PTFE sleeve 12. A packing gland 25 is connected to the flange at the end of the connecting pipe 23 away from the pump casing 1. One end of the packing gland 25 is inserted into the PTFE inner liner 5 and tightly abuts against the sealing packing 24 to achieve a sealed connection between the PTFE sleeve 12 and the PTFE inner liner 5. The sealing packing 24 is preferably graphite braided packing.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A corrosion-resistant circulating pump, characterized in that: The system includes a pump casing (1), an outlet pipe (2) on the outer peripheral wall of the pump casing (1), a casing cover (3) connected to the front opening of the pump casing (1) by a flange, an inlet pipe (4) on the outer wall of the casing cover (3), a connecting pipe (23) on the rear wall of the pump casing (1), a pump shaft (11) passing through the connecting pipe (23), and a PTFE inner liner (5) and a PTFE inner cover (8) inside the pump casing (1). The rear end extends into the connecting pipe (23) and fits against the inner wall of the connecting pipe (23). The outer walls of the PTFE inner liner (5) and the PTFE inner cover (8) are integrally formed with several nuts (21). The inner walls of the pump housing (1) and the cover (3) are provided with opening slots corresponding to the nuts (21). The nuts (21) are located in the corresponding opening slots. The outer walls of the pump housing (1) and the cover (3) are provided with multiple bolts (22). The bolts (22) are connected to the outer walls of the pump housing (1) and the cover (3). The corresponding nuts (21) are fitted together. PTFE inner lining tubes (10) are installed inside both the outlet pipe (2) and the inlet pipe (4). The PTFE inner lining shell (5) and the PTFE inner lining cover (8) are detachably and sealed to the corresponding PTFE inner lining tubes (10). A PTFE sleeve (12) is fixedly fitted onto the outer wall of the pump shaft (11). One end of the pump shaft (11) and the PTFE sleeve (12) is inserted into the PTFE inner lining through a connecting pipe (23). Inside the shell (5), a stainless steel sleeve (13) is fixedly fitted at one end of the PTFE sleeve (12) inside the PTFE inner liner shell (5). A stainless steel impeller (15) is detachably installed on the outer wall of the stainless steel sleeve (13). The PTFE sleeve (12) is sealed to the PTFE inner liner shell (5). A bearing bracket (20) is rotatably connected to the outer wall of the pump shaft (11) through a bearing. The bearing bracket (20) is connected to the rear flange of the pump shell (1).

2. The corrosion-resistant circulating pump according to claim 1, characterized in that: The PTFE inner liner (5) has an outlet corresponding to the outlet pipe (2), the PTFE inner liner (8) has an inlet corresponding to the inlet pipe (4), the outer wall of the PTFE inner liner (5) and the outlet corresponding to the outlet, and the outer wall of the PTFE inner liner (8) and the inlet corresponding to the inlet are all provided with threaded grooves (6), the end of the PTFE inner liner tube (10) is threaded to the corresponding threaded groove (6), and a first sealing ring (7) is embedded between the contact surfaces of the PTFE inner liner (5) and the PTFE inner liner (8) and the corresponding PTFE inner liner tube (10).

3. The corrosion-resistant circulating pump according to claim 1, characterized in that: Multiple second sealing rings (9) are embedded between the contact surfaces of the PTFE inner liner cover (8) and the PTFE inner liner shell (5).

4. A corrosion-resistant circulating pump according to claim 1, characterized in that: The stainless steel sleeve (13) and the stainless steel impeller (15) are connected by a key (17). The inner wall of the stainless steel impeller (15) and the outer wall of the stainless steel sleeve (13) are provided with keyways (16) that are compatible with the key (17). A locking screw cap (18) is provided inside the stainless steel impeller (15), and the locking screw cap (18) is threaded to the end of the pump shaft (11). A third sealing ring (19) is embedded at the corresponding position of the inner wall of the stainless steel impeller (15) and the locking screw cap (18). The third sealing ring (19) fits against the outer wall of the locking screw cap (18).

5. A corrosion-resistant circulating pump according to claim 1, characterized in that: The inner and outer peripheral walls of the PTFE sleeve (12) are provided with protrusions (14), and the outer wall of the pump shaft (11) and the inner wall of the stainless steel sleeve (13) are provided with grooves that are adapted to the protrusions (14). The protrusions (14) are located in the corresponding grooves, and the pump shaft (11) and the stainless steel sleeve (13) are both interference-fitted with the PTFE sleeve (12).

6. A corrosion-resistant circulating pump according to claim 1, characterized in that: A sealing packing (24) is provided inside the PTFE inner liner (5) at the corresponding position of the connecting pipe (23). The sealing packing (24) is sleeved on the PTFE sleeve (12). A packing gland (25) is connected to the flange at the end of the connecting pipe (23) away from the pump casing (1). One end of the packing gland (25) is inserted into the PTFE inner liner (5) and is tightly abutted against the sealing packing (24).

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