Screw pump operation safety device

Abstract

The utility model discloses a screw pump operation safety device and relates to the technical field of screw pumps. A rotating sleeve is installed in the stepped hole, a spiral fin extends from an inner hole of the rotating sleeve to the axis, a permanent magnet sleeve is connected to the outer side of the rotating sleeve in an interference fit mode and connected with the stepped hole in a clearance fit mode, and the upper portion of the feeding bin is connected with a limiting pipe through a bolt and blocked on the upper portion of the rotating sleeve; the outer side of the feeding pipe is connected with a retaining cover through a bolt, and an electromagnetic coil is installed in the retaining cover. The screw pump has the advantages that when fluid enters the feeding pipe, the spiral fins drive the rotary sleeve and the permanent magnet sleeve to rotate, the permanent magnet sleeve rotates to enable the electromagnetic coil to generate current, a wire of the electromagnetic coil is connected to the control box, and the control box monitors the magnitude of the current so that the feeding flow of the screw pump can be displayed. And when the feeding flow is reduced to a set value or no current exists (the feeding pipe does not feed), the screw pump is stopped immediately, so that the occurrence of a dry grinding site between the stator and the rotor is prevented, and the service life of the stator is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to screw pump technical field especially relates to a screw pump operation safety device. BACKGROUND

[0002] The screw pump is generally composed of rubber stator and stainless steel rotor, in the process of transporting fluid, the fluid acts as lubricant to protect the rubber stator and stainless steel rotor, when the screw pump is in idle running or the fluid volume is small, the rotor and stator will produce dry friction, which affects the service life. Generally, the screw pump uses electromagnetic flowmeter to monitor the inlet flow of the screw pump, however, for conveying some fluids, such as oily sludge, the electromagnetic flowmeter is prone to deviation, some screw pumps protect the stator and rotor by temperature probe, but when the temperature probe alarms, dry friction has occurred for a long time, so the protection effect of this protection method is poor. SUMMARY

[0003] In order to solve the problem of dry friction between the stator and rotor of the screw pump during idle running, the utility model provides a screw pump operation safety device.

[0004] The utility model provides a technical scheme: a screw pump operation safety device, which comprises a feed bin of a screw pump, a feed pipe is arranged on the upper part of the feed bin, the feed pipe is provided with a stepped hole downward from the top, a rotating sleeve is arranged in the stepped hole, the inner hole of the rotating sleeve extends to the axis and is provided with helical fins, the helical fins are evenly distributed in three circles, the outer side of the rotating sleeve is connected with a permanent magnet sleeve through interference fit, the permanent magnet sleeve is connected with the stepped hole through clearance fit, the upper part of the feed pipe is connected with a limiting pipe through bolts, and the limiting pipe is arranged on the upper part of the rotating sleeve.

[0005] The outer side of the feed pipe is connected with a retaining cover through bolts, an electromagnetic coil is arranged in the retaining cover, and the inner side of the electromagnetic coil is attached to the feed pipe.

[0006] The feed bin is made of stainless steel material.

[0007] The electromagnetic coil is connected with an indicator lamp through wires.

[0008] The rotating sleeve and the stepped hole are connected through a plane bearing.

[0009] The upper part of the limiting pipe is provided with a connecting flange.

[0010] The utility model has the advantages that when the fluid enters the feed pipe, the helical fins drive the rotating sleeve and the permanent magnet sleeve to rotate, the permanent magnet sleeve rotates to make the electromagnetic coil generate current, the wires of the electromagnetic coil are connected to a control box, the control box monitors the size of the current to display the feed flow of the screw pump, when the feed flow is reduced to the set value or there is no current (the feed pipe has no feed), the screw pump is stopped immediately to prevent dry friction between the stator and rotor, and the service life of the stator is improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure Figure 1 is a structural schematic diagram of the utility model;

[0012] Figure Figure 2 is a structural schematic diagram of the utility model; Figure 1 is an enlarged view of B in figure

[0013] Figure Figure 3 is a structural schematic diagram of the utility model; Figure 2 is an A-A sectional view of figure

[0014] Figure Figure 4 is a structural schematic diagram of the utility model.

[0015] Figure 1 - feed bin, 2 - feed pipe, 21 - step hole, 3 - limiting tube, 4 - rotating sleeve, 5 - spiral fin, 6 - permanent magnet sleeve, 7 - electromagnetic coil, 8 - retaining cover, 9 - indicator light, 10 - plane bearing. DETAILED DESCRIPTION

[0016] As Figures 1 to 4 shown, a kind of screw pump operating safety device, including the feed bin 1 of screw pump, feed bin 1 upper portion is equipped with feed pipe 2, feed pipe 2 is opened from top down with a step hole 21, rotating sleeve 4 is installed in step hole 21, spiral fin 5 extends to axis in rotating sleeve 4 hole, spiral fin 5 is three circumferential distribution, rotating sleeve 4 outer side is connected with permanent magnet sleeve 6 by interference fit, permanent magnet sleeve 6 is connected with step hole 21 by clearance fit, feed pipe 2 upper portion is connected with limiting tube 3 by bolt, limiting tube 3 is blocked in rotating sleeve 4 upper portion;

[0017] Feed pipe 2 outer side is connected with retaining cover 8 by bolt, retaining cover 8 is installed with electromagnetic coil 7 in, electromagnetic coil 7 inside is bonded with feed pipe 2.

[0018] When fluid enters feed pipe 2, spiral fin 5 drives rotating sleeve 4 and permanent magnet sleeve 6 to rotate, permanent magnet sleeve 6 rotates, magnetic force line cuts electromagnetic coil 7, so that electromagnetic coil 7 generates current, the lead of electromagnetic coil 7 is connected to control box, control box monitors the size of current, i.e. the feed flow of screw pump can be displayed, when the feed flow reduces to set value or there is no current (feed pipe 2 has no feed), screw pump is stopped immediately, prevent the dry grinding site between stator and rotor from happening, improve the service life of stator.

[0019] Feed bin 1 is made of stainless steel material, without affecting the magnetic circuit of permanent magnet sleeve.

[0020] Electromagnetic coil 7 has lead connection indicator light 9, for on-site indication.

[0021] Rotating sleeve 4 and step hole 21 are connected by plane bearing 10.

[0022] The upper part of the limiting pipe 3 is provided with a connecting flange, without changing the original installation structure.

Claims

1. A screw pump running safety device comprising a feed chamber (1) of a screw pump, characterized in that: The upper part of the feeding bin (1) is provided with a feeding pipe (2), the feeding pipe (2) is provided with a stepped hole (21) downward from the top, the stepped hole (21) is provided with a rotating sleeve (4), the inner hole of the rotating sleeve (4) extends to the axis and is provided with helical fins (5), the helical fins (5) are three circumferentially distributed, the outer side of the rotating sleeve (4) is provided with an interference fit connection permanent magnet sleeve (6), the permanent magnet sleeve (6) is connected with the stepped hole (21) in a clearance fit, the upper part of the feeding pipe (2) is connected with a limiting pipe (3) through bolts, the limiting pipe (3) is blocked on the upper part of the rotating sleeve (4). The outer side of the feeding pipe (2) is connected with a retaining cover (8) through bolts, the retaining cover (8) is provided with an electromagnetic coil (7) inside, and the inner side of the electromagnetic coil (7) is attached to the feeding pipe (2).

2. A screw pump running protection device according to claim 1, characterized in that: The feeding bin (1) is made of stainless steel material.

3. A screw pump running protection device according to claim 1, characterized in that: The electromagnetic coil (7) is connected with an indicator light (9) through wires.

4. A screw pump running protection device according to claim 1, characterized in that: The rotating sleeve (4) and the stepped hole (21) are connected through a plane bearing (10).

5. A screw pump running protection device according to claim 1, characterized in that: The upper part of the limiting pipe (3) is provided with a connecting flange.

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