A single screw pump that is easy to maintain online

Abstract

The present invention relates to the technical field of single screw pumps, and relates to a single screw pump that is easy to maintain online, including a discharge body, a base, a suction chamber and a reduction motor, wherein the reduction motor, a direct coupling frame, a suction chamber, a pump body and a discharge body are sequentially arranged on the base; the reduction motor is installed at one end of the base, and is used to provide driving force for the pump body; the direct coupling frame is used to connect the reduction motor with the suction chamber; the output shaft of the reduction motor is sequentially connected to the split rotor in the pump body through an extension shaft arranged in the direct coupling frame and a coupling rod in the suction chamber; after the discharge body is separated from the pump body, an opening is formed at one end of the pump body away from the coupling rod; the suction chamber is a windowed visible suction chamber, and after the windowed visible suction chamber is opened, an operation area is formed for separating the split rotor from the coupling rod; so that the stator and the split rotor can be quickly removed for easy replacement. The present invention sets the traditional discharge body as a split welded discharge body, and sets a window in the suction chamber; the stator and the rotor can be conveniently disassembled; and a temperature sensor is set to monitor the temperature to avoid overheating caused by dry operation.

Description

Technical Field

[0001] The invention relates to the technical field of single screw pumps, in particular to a single screw pump which is easy to maintain online. Background Art

[0002] Pumps play a core role in production and daily life, especially in key areas such as environmental protection, agriculture, chemical industry, petroleum, electricity, metallurgy, food and new energy. As the main force of fluid transportation, their importance is self-evident. As a member of the positive displacement pump family, the single screw pump plays an irreplaceable role in these fields with its excellent ability to transport high-solid content and high-viscosity media, low shear, no pulsation and excellent pressure-bearing performance. Fig.10 As shown in the figure, it is a stereogram of a common single screw pump. Fig.11 The figure shows a cross-section of a common single screw pump. In the face of society's constant pursuit of efficiency and rapid development, single screw pumps are facing new performance and functional challenges, especially in terms of the convenience of equipment fault diagnosis and the rapid replacement of wearing parts. There are the following shortcomings:

[0003] 1. The single screw pump achieves the medium transportation through the meshing change of the rotor (screw) and the stator (bushing). Since the stator lining is usually made of rubber material, one of the most common failures of the single screw pump is the overheating and dry burning of the stator lining rubber due to insufficient feed. How to avoid the occurrence of dry running has become an urgent problem to be solved for the single screw pump.

[0004] 2. Given the structural characteristics of single screw pumps, especially in situations where large flow and high pressure need to be handled, the space they occupy is relatively large. In addition, the rotor and stator, as core components, require additional space when replaced, which not only affects the layout of the process pipeline, but also has a significant impact on production efficiency. Summary of the invention

[0005] The purpose of the present invention is to address the problems existing in the background technology and to propose a single-screw pump that is easy to maintain online; by setting the traditional discharge body as a split welded discharge body and providing a window in the suction chamber; the stator and the rotor can be easily disassembled; and a temperature sensor is provided to monitor the temperature to avoid overheating caused by dry operation.

[0006] The technical solution of the present invention is a single screw pump that is easy to maintain online, comprising a discharge body, a base, a suction chamber and a reduction motor, wherein the reduction motor, a direct coupling frame, a suction chamber, a pump body and a discharge body are sequentially arranged on the base;

[0007] The base is arranged at the bottom to support the entire product;

[0008] The reduction motor is installed at one end of the base to provide driving force for the pump body;

[0009] The direct coupling frame is used to connect the reduction motor with the suction chamber; a feed port is reserved on the suction chamber; the other end of the suction chamber is connected to the pump body; the discharge body is installed at the output end of the pump body;

[0010] The output shaft of the reduction motor is connected to the split rotor in the pump body through the extension shaft arranged in the direct coupling frame and the coupling rod in the suction chamber in turn, providing driving force for the split rotor to rotate relative to the stator, thereby transporting the material from the feed port toward the discharge body;

[0011] The discharge body is a split welded discharge body, which forms an opening at one end of the pump body away from the connecting rod after being separated from the pump body; the suction chamber is a windowed visible suction chamber, and after the windowed visible suction chamber is opened, an operating area is formed to separate the split rotor from the connecting rod; the stator and the split rotor can be quickly removed for easy replacement.

[0012] Preferably, the output shaft of the reduction motor is inserted into the direct coupling frame and connected to the extension shaft, and is fixed by a first cylindrical pin and a rubber stopper sleeve;

[0013] One end of the extension shaft 7 passes through the direct coupling frame and extends into the windowed visible suction chamber; a mechanical seal cavity is formed at the connection between the extension shaft and the direct coupling frame; a mechanical seal and a stud assembly are used at the mechanical seal cavity for sealing and fixing.

[0014] Preferably, the windowed visible suction chamber comprises a suction chamber housing and a visible opening located on one side of the feed inlet;

[0015] A PP window gland is arranged at the visual opening, and a first rubber sealing pad and a spring washer are arranged at the PP window gland for sealing, and a cylindrical head screw is used for locking.

[0016] Preferably, the connection portion between the coupling rod and the extension shaft is located at the feed inlet;

[0017] The connection part between the coupling rod and the split rotor is located directly below the viewing opening.

[0018] Preferably, the coupling rod and the split rotor are connected and fixed via a conversion joint;

[0019] The coupling rod is fixed with the aid of a connecting pin; a pin sleeve is arranged along the outer periphery of the connecting pin, and a second O-ring is arranged on the inner side of the pin sleeve to seal between the conversion joint and the connecting pin; a first steel wire retaining ring and a rubber skeleton protective sleeve are arranged along the outer side of the coupling rod, and fixed with a tightening ring; a cavity for containing lubricating oil is formed between the rubber skeleton protective sleeve and the coupling rod;

[0020] The split rotor is fixed with the aid of a second cylindrical pin, a bolt cover and a matching hexagonal protective cap are arranged along the outer circumference of the second cylindrical pin, and a second wire retaining ring is used at the outermost circumference for limit fixing; a second rubber sealing gasket is arranged between the bolt cover and the conversion joint; a first O-ring is arranged between the molecular rotor and the conversion joint for sealing.

[0021] Preferably, a sewage plug is provided at a position directly below the visible opening at the bottom of the windowed visible suction chamber.

[0022] Preferably, the pump body includes a stator and a split rotor; a plurality of stator tie rods are arranged outside the stator; a plurality of supporting feet are arranged at the bottom of the stator; and the supporting feet are fixed to the base by fasteners.

[0023] Preferably, an inserted temperature sensor is provided on the stator; the temperature sensor is fixed to the stator by a fastening nut; a connecting shell is provided at one end of the temperature sensor and is exposed outside the stator; the connecting shell is used to connect the signal line to the host computer.

[0024] Preferably, the split welded discharge body comprises a convex face-to-face welding flange, a discharge body shell and a flange pull plate;

[0025] The middle of the convex face welding flange is a welding seam for connection; the flange pull plate is sleeved on the outer circumference of the discharge body shell; the flange pull plate is first sleeved on the discharge body shell, and then the convex face welding flange is welded along the welding seam to form a whole;

[0026] The four corners of the flange pull plate are provided with U-shaped grooves for matching and installing with the stator pull rod.

[0027] Preferably, the split welded discharge body is first removed by removing the nuts and spring washers on the stator pull rod, removing the flange pull plate, removing the support feet at the lower end of the split welded discharge body, and taking out the stator pull rod through the U-shaped groove, and finally removing the connecting bolts on the flange side of the split welded discharge body, and the split welded discharge body can be easily removed.

[0028] Compared with the prior art, the present invention has the following beneficial technical effects:

[0029] The present invention innovatively adds a window to the suction chamber on the basis of the existing equipment and sets the discharge body as a split welded structure; compared with the existing technology, the added window structure is not only convenient for monitoring the conveying status of the material, but also can effectively prevent the damage to the stator caused by problems such as pipeline blockage; with the split welded discharge body, when overhauling the traditional equipment or replacing the wearing parts, the discharge body can be easily removed by simply disassembling and assembling; and the rotor can be quickly separated through the inspection port formed at the window, which greatly reduces the workload and reduces the downtime of the equipment;

[0030] The present invention installs a PT100 platinum resistance temperature sensor at the thickest wall of the stator and on the side close to the suction chamber, and sets parameters through a temperature controller to achieve real-time monitoring of the stator temperature (the conventional measurement range is set at -20°C to +200°C). Once the stator overheats due to dry running, causing the temperature to exceed the set shutdown threshold (usually 10°C higher than the maximum operating temperature of the pump), the controller will immediately issue a photoelectric alarm or cut off the power supply for emergency shutdown to protect the stator lining rubber from high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the three-dimensional structure of a single screw pump in an embodiment of the present invention;

[0032] Figure 2 is a cross-sectional view of a single screw pump in an embodiment of the present invention;

[0033] Figure 3 A cross-sectional view of an inhalation chamber with a window for viewing in an embodiment of the present invention;

[0034] Figure 4 It is a schematic structural diagram of a split-welded discharge body in an embodiment of the present invention;

[0035] Figure 5 In the embodiment of the present invention Figure 2 A partial enlarged schematic diagram of

[0036] Figure 6 This is a comparison diagram between the split welded type and the integral cast discharge body;

[0037] Figure 7 A comparison diagram of a conventional suction chamber and a windowed visual suction chamber of the present invention;

[0038] Figure 8 This is a schematic diagram of dry-running installation in an embodiment of the present invention;

[0039] Fig. 9 It is a schematic diagram comparing the split type and the integral rotor;

[0040] Fig.10 A stereogram of a conventional single screw pump;

[0041] Fig.11 Cross-section of a conventional single-screw pump.

[0042] Figure numerals: 1, split welded discharge body; 2, stator; 3, split rotor; 4, stator tie rod; 5, window visible suction chamber; 6, connecting rod; 7, extension shaft; 8, stud assembly; 9, reduction motor; 10, first cylindrical pin; 11, rubber stopper; 12, direct coupling frame; 13, mechanical seal chamber; 14, mechanical seal; 15, sewage plug; 16, support foot; 17, base; 18, fastener; 19, first rubber sealing gasket; 20, PP window gland; 21, cylindrical head screw; 22, spring washer; 23, Suction chamber shell; 24, convex face welding flange; 25, discharge body shell; 26, flange pull plate; 27, U-shaped groove; 28, first O-ring; 29, bolt cover; 30, second O-ring; 31, first steel wire retaining ring; 32, rubber skeleton protective sleeve; 33, tight hoop; 34, pin sleeve; 35, connecting pin; 36, second steel wire retaining ring; 37, hexagonal protective cap; 38, second rubber sealing pad; 39, conversion joint; 40, second cylindrical pin; 41, spare nut; 42, connecting shell; 43, temperature sensor. DETAILED DESCRIPTION

[0043] Example 1

[0044] like Figure 1 As shown, the present invention provides a single screw pump that is easy to maintain online, including a discharge body, a base 17, a suction chamber and a reduction motor 9, and the reduction motor 9, the direct coupling frame 12, the suction chamber, the pump body and the discharge body are sequentially arranged on the base 17;

[0045] The base 17 is arranged at the bottom to support the entire product; the reduction motor 9 is installed at one end of the base 17 to provide driving force for the pump body; the direct-connected frame 12 is used to connect the reduction motor 9 with the suction chamber; a feed port is reserved on the suction chamber; the other end of the suction chamber is connected to the pump body; the discharge body is installed at the output end of the pump body; the output shaft of the reduction motor 9 is connected to the split rotor 3 in the pump body through the extension shaft 7 arranged in the direct-connected frame 12 and the connecting rod 6 in the suction chamber in turn, providing driving force for the split rotor 3 to rotate relative to the stator 2, thereby transporting the material from the feed port toward the discharge body; the discharge body is a split welded discharge body 1, which forms an opening at one end of the pump body away from the connecting rod 6 after being separated from the pump body; the suction chamber is a windowed visible suction chamber 5, and after the windowed visible suction chamber 5 is opened, an operation area is formed to separate the split rotor 3 from the connecting rod 6, so that the stator 2 and the split rotor 3 can be quickly removed for easy replacement.

[0046] In this embodiment, if Figure 2The output shaft of the reduction motor 9 shown is inserted into the direct coupling frame 12 and connected to the extension shaft 7, and is fixed by a first cylindrical pin 10 and a rubber stop sleeve 11; one end of the extension shaft 7 passes through the direct coupling frame 12 and extends into the window visible suction chamber 5; a mechanical sealing chamber 13 is formed at the connection between the extension shaft 7 and the direct coupling frame 12; a mechanical seal 14 and a stud assembly 8 are used at the mechanical sealing chamber 13 for sealing and fixing.

[0047] like Figure 3 As shown, the windowed visible suction chamber 5 includes a suction chamber shell 23 and a visible opening located on one side of the feed port; a PP window gland 20 is provided at the visible opening, and a first rubber seal 19 and a spring washer 22 are provided at the PP window gland 20 for sealing, and a cylindrical head screw 21 is used for locking. The connection part between the coupling rod 6 and the extension shaft 7 is located at the feed port; the connection part between the coupling rod 6 and the split rotor 3 is located directly below the visible opening. The coupling rod 6 and the split rotor 3 are connected and fixed by a conversion joint 39;

[0048] like Figure 5 As shown, the connecting rod 6 is fixed with the aid of the connecting pin 35; a pin sheath 34 is arranged along the outer periphery of the connecting pin 35, and a second O-ring 30 is arranged on the inner side of the pin sheath 34 to seal between the conversion joint 39 and the connecting pin 35; a first steel wire retaining ring 31 and a rubber skeleton protective sleeve 32 are arranged along the outer side of the connecting rod 6, and fixed with a tightening ring 33; a cavity for containing lubricating oil is formed between the rubber skeleton protective sleeve 32 and the connecting rod 6;

[0049] The split rotor 3 is fixed with the aid of the second cylindrical pin 40, a bolt gland 29 and a matching hexagonal cap 37 are arranged along the outer periphery of the second cylindrical pin 40, and a second steel wire retaining ring 36 is used at the outermost periphery for position fixing; a second rubber sealing pad 38 is arranged between the bolt gland 29 and the conversion joint 39; a first O-ring 28 is arranged between the molecular rotor 3 and the conversion joint 39 for sealing. The pump body includes a stator 2 and a split rotor 3; a plurality of stator tie rods 4 are arranged outside the stator 2; a plurality of legs 16 are arranged at the bottom of the stator 2; the legs 16 are fixed to the base 17 by fasteners 18.

[0050] like Figure 4As shown, the split welded discharge body 1 includes a convex face welding flange 24, a discharge body shell 25 and a flange pull plate 26; the middle of the convex face welding flange 24 is a weld for connection; the flange pull plate 26 is mounted on the outer periphery of the discharge body shell 25; the flange pull plate 26 is first mounted on the discharge body shell 25, and then the convex face welding flange 24 is welded along the weld to form a whole; the four corners of the flange pull plate 26 are provided with U-shaped grooves for matching with the stator rod. When traditional equipment is overhauled or wearing parts are replaced, the front and rear valves of the pump need to be closed, and the process pipeline at the front end of the discharge body needs to be removed, and the pipeline length needs to exceed Figure 2 The L value shown in the figure not only takes up a lot of space and increases the workload, but also affects production due to long-term downtime; the split welded discharge body 1 of the present invention first removes the nuts and spring washers on the stator pull rod 4, removes the flange pull plate 26, removes the support foot 16 at the lower end of the split welded discharge body 1, and removes the stator pull rod 4 through the U-shaped groove 27, and finally removes the connecting bolts on the flange side of the split welded discharge body 1, and the split welded discharge body 1 can be easily removed. Compared with traditional products, this application can greatly improve the efficiency of equipment replacement and save time.

[0051] Example 2

[0052] like Figure 2 As shown, the present invention provides a single screw pump that is easy to maintain online; different from Example 1, a drain plug 15 is provided at the bottom of the windowed visible suction chamber 5, near the position directly below the visible opening. When the suction chamber needs to be maintained, use an Allen wrench to unscrew the drain plug 15 at the bottom to drain the material, then unscrew the cylindrical head screw 21 and the spring washer 22 on the PP window gland 20, open the PP window gland 20, and remove the first rubber seal I19. Next, use needle-nosed pliers to remove the second wire retaining ring 36 in the slot, remove the hexagonal cap 37 protecting the bolt gland 29, use an extended Allen wrench to unscrew the bolt gland 29, and remove the second cylindrical pin 40. Finally, pull the stator 2 and the rotor 3 out of the pin hole, and replace the damaged parts.

[0053] Example 3

[0054] like Figure 8 As shown, the present invention provides a single-screw pump that is easy to maintain online; different from Example 1, an inserted temperature sensor 43 is provided on the stator 2; the temperature sensor 43 is fixed to the stator 2 by a spare nut 41; a connecting shell 42 is provided at one end of the temperature sensor 43 and is exposed to the outside of the stator 2; the connecting shell 42 is used to connect the signal line to the host computer.

[0055] In this embodiment, the windowed visible suction chamber 5 is not only convenient for monitoring the conveying status of the material, but also can effectively prevent damage to the stator 2 caused by problems such as pipeline blockage. In order to ensure the long-term stability of the equipment, a PT100 platinum resistance temperature sensor 43 is installed at the thickest wall of the stator 2 and on the side close to the suction chamber, and the parameters are set by the temperature controller to achieve real-time monitoring of the stator temperature (the conventional measurement range is set at -20°C to +200°C). Once the stator 2 overheats due to dry operation, causing the temperature to exceed the set shutdown threshold (usually 10°C higher than the maximum operating temperature of the pump), the controller will immediately issue a photoelectric alarm or cut off the power supply for emergency shutdown to protect the stator lining rubber from high temperature.

[0056] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A single screw pump that is easy to maintain online, comprising a discharge body, a base (17), a suction chamber and a reduction motor (9), characterized in that: A reduction motor (9), a direct coupling frame (12), a suction chamber, a pump body and a discharge body are sequentially arranged on the base (17); A base (17) is arranged at the bottom to support the entire product; The reduction motor (9) is mounted on one end of the base (17) and is used to provide driving force for the pump body; The direct coupling frame (12) is used to connect the reduction motor (9) and the suction chamber; a feed port is reserved on the suction chamber; the other end of the suction chamber is connected to the pump body; and the discharge body is installed at the output end of the pump body; The output shaft of the reduction motor (9) is connected to the split rotor (3) in the pump body through the extension shaft (7) arranged in the direct coupling frame (12) and the coupling rod (6) in the suction chamber, providing driving force for the split rotor (3) to rotate relative to the stator (2), thereby conveying the material from the feed port toward the discharge body; The discharge body is a split welded discharge body (1), which forms an opening at one end of the pump body away from the connecting rod (6) after being separated from the pump body; the suction chamber is a windowed visible suction chamber (5), and after the windowed visible suction chamber (5) is opened, an operation area is formed for separating the split rotor (3) from the connecting rod (6); so that the stator (2) and the split rotor (3) can be quickly removed for easy replacement.

2. The single screw pump that is easy to maintain online according to claim 1, characterized in that: The output shaft of the reduction motor (9) is inserted into the direct coupling frame (12) and connected to the extension shaft (7), and is fixed by using a first cylindrical pin (10) and a rubber stopper sleeve (11); One end of the extension shaft (7) passes through the direct coupling frame (12) and extends into the windowed visible suction chamber (5); a mechanical seal cavity (13) is formed at the connection between the extension shaft (7) and the direct coupling frame (12); a mechanical seal (14) and a stud assembly (8) are used at the mechanical seal cavity (13) for sealing and fixing.

3. The single screw pump that is easy to maintain online according to claim 1, characterized in that: The windowed visible suction chamber (5) comprises a suction chamber housing (23) and a visible opening located on one side of the feed inlet; A PP window pressure cover (20) is arranged at the visual opening, and a first rubber sealing pad (19) and a spring washer (22) are arranged at the PP window pressure cover (20) for sealing, and a cylindrical head screw (21) is used for locking.

4. The single screw pump that is easy to maintain online according to claim 3 is characterized in that: The connection portion between the connecting rod (6) and the extension shaft (7) is located at the feed inlet; The connection portion between the coupling rod (6) and the split rotor (3) is located directly below the visible opening.

5. The single screw pump that is easy to maintain online according to claim 1, characterized in that: The coupling rod (6) and the split rotor (3) are connected and fixed via a conversion joint (39); The connecting rod (6) is fixed with the aid of a connecting pin (35); a pin sleeve (34) is arranged along the outer periphery of the connecting pin (35), and a second O-ring (30) is arranged on the inner side of the pin sleeve (34) for sealing between the conversion joint (39) and the connecting pin (35); a first steel wire retaining ring (31) and a rubber frame protective sleeve (32) are arranged along the outer side of the connecting rod (6), and fixed with a tightening ring (33); a cavity for containing lubricating oil is formed between the rubber frame protective sleeve (32) and the connecting rod (6); The split rotor (3) is fixed with the aid of a second cylindrical pin (40); a bolt pressure cover (29) and a matching hexagonal protective cap (37) are arranged along the outer circumference of the second cylindrical pin (40); and a second steel wire retaining ring (36) is used at the outermost circumference for position limiting and fixing; a second rubber sealing pad (38) is arranged between the bolt pressure cover (29) and the conversion joint (39); and a first O-ring (28) is arranged between the molecular rotor (3) and the conversion joint (39) for sealing.

6. The single screw pump that is easy to maintain online according to claim 1, characterized in that: A sewage discharge plug (15) is arranged at a position directly below the visible opening at the bottom of the windowed visible suction chamber (5).

7. The single screw pump that is easy to maintain online according to claim 1, characterized in that: The pump body comprises a stator (2) and a split rotor (3); a plurality of stator tie rods (4) are arranged outside the stator (2); a plurality of support feet (16) are arranged at the bottom of the stator (2); and the support feet (16) are fixed to a base (17) by means of fasteners (18).

8. The single screw pump that is easy to maintain online according to claim 7, characterized in that: An inserted temperature sensor (43) is provided on the stator (2); the temperature sensor (43) is fixed on the stator (2) via a fastening nut (41); a connecting shell (42) is provided at one end of the temperature sensor (43) and is exposed outside the stator (2); the connecting shell (42) is used to connect a signal line to a host computer.

9. The single screw pump that is easy to maintain online according to claim 1, characterized in that: The split welded discharge body (1) comprises a convex face welding flange (24), a discharge body shell (25) and a flange pull plate (26); The middle part of the convex face welding flange (24) is a welding seam for connection; the flange pull plate (26) is sleeved on the outer periphery of the discharge body shell (25); the flange pull plate (26) is first sleeved on the discharge body shell (25), and then the convex face welding flange (24) is welded along the welding seam to form a whole; Four corners of the flange pull plate (26) are provided with U-shaped grooves (27) for matching and installing with the stator pull rod (4).

10. The single screw pump that is easy to maintain online according to claim 9, characterized in that: The split welded discharge body (1) is firstly removed by disassembling the nut and spring washer on the stator tie rod (4), removing the flange pull plate (26), removing the support foot (16) at the lower end of the split welded discharge body (1), and taking out the stator tie rod (4) through the U-shaped groove (27), and finally removing the connecting bolts on the flange side of the split welded discharge body (1), so that the split welded discharge body (1) can be easily removed.

Images