Single-screw pump for conveying medium easy for solid-liquid separation

Abstract

The utility model discloses a single-screw pump for conveying a medium easy for solid-liquid separation, relates to the technical field of screw pumps, and aims to prevent the flow velocity of the medium easy for solid-liquid separation from decreasing when the medium easy for solid-liquid separation enters the single-screw pump by improving the feeding end structure of the single-screw pump and improving a connecting tee joint so as to prevent the medium from solid-liquid separation to influence the component proportion of the medium. Comprising a horizontally-arranged base, the base is provided with a driving motor, a coupling unit, a universal joint and a screw rod which are sequentially connected, the screw rod is sleeved with a screw rod sleeve, the universal joint is sleeved with a connecting tee joint, and the two horizontally-arranged ends of the connecting tee joint are connected with the coupling unit and the screw rod sleeve respectively; the other end of the connecting tee joint is a discharging end, and the discharging end is located on the side close to the base. The other end of the screw sleeve is a feeding end, the feeding end is connected with a feeding pipe, and the height of the side, facing the feeding end, of the feeding pipe is gradually reduced till the side, facing the feeding end, of the feeding pipe is flush with the feeding end.

Description

Technical Field

[0001] The utility model relates to the technical field of screw pumps, in particular to a single screw pump for conveying a medium that is easily separated from solid and liquid. Background Art

[0002] A single-screw pump is a rotor-type positive displacement pump that relies on the meshing of the screw and the bushing to produce volume changes between the suction chamber and the discharge chamber to transport materials. It is an internally meshing closed screw pump. The main working parts consist of a bushing (stator) with a double-headed spiral cavity and a single-headed spiral screw (rotor) meshing with it in the stator cavity.

[0003] Among them, the output end of the motor drives the single-head screw rod to rotate through the coupling, shaft seal, universal joint and other components in turn. When the universal joint is installed, it is installed in the connecting tee, and the two ends of the connecting tee correspond to the two ends of the universal joint respectively. The other end of the connecting tee is used as the feeding end of the material. Since the rotation of the universal joint requires sufficient space for movement, the connecting tee has a larger diameter to accommodate the two ends of the universal joint.

[0004] When using the existing single-screw pump to transport petrochemical media, a catalyst needs to be added to the petrochemical medium. The catalyst is composed of heavy metal particles (solid) and heavy aromatics (liquid). Since the diameter of the cavity part of the connecting tee is larger than the diameter of the feed end, the flow rate of the medium in the cavity will be lower than the flow rate of the feed port, which makes it easy for heavy aromatics and metal particles to separate.

[0005] When heavy aromatics and metal particles are separated, the following problems will occur: First, the liquid (heavy aromatics) is transported away by the pump, while the solid particles (heavy metal particles) will be deposited in the tee and cannot be transported away, and the catalyst medium cannot be transported accurately in proportion; second, too much solid (heavy metal particles) will be deposited in the tee, which will increase the wear of the stator, rotor, mechanical seal, etc., and may even cause jamming. Utility Model Content

[0006] 1. Technical Problems Solved

[0007] In view of the deficiencies in the prior art, the utility model proposes a single screw pump for conveying a medium that is easily solid-liquid separated. By improving the feed end structure of the single screw pump and improving the connecting tee, a decrease in flow rate is avoided when the medium that is easily solid-liquid separated enters the single screw pump, thereby avoiding solid-liquid separation in the medium and affecting its component ratio.

[0008] 2. Specific technical solutions

[0009] A single screw pump for conveying a medium that is easily separated from solid and liquid, comprises a horizontally arranged base, on which a driving motor, a coupling unit, a universal joint and a screw that are connected in sequence are arranged, a screw sleeve is sleeved on the outer side of the screw, a connecting tee is sleeved on the outer side of the universal joint, the two horizontally arranged ends of the connecting tee are respectively connected to the coupling unit and the screw sleeve, the other end of the connecting tee is a discharge end, and the discharge end is located on a side close to the base; the other end of the screw sleeve is a feed end, the feed end is connected to a feed pipe, and the height of the feed pipe gradually decreases towards the feed end until it is aligned with the feed end.

[0010] Implementation principle and working principle:

[0011] The medium inlet of the existing single screw pump is arranged at the upper end of the connecting tee, and the medium outlet is arranged on the screw sleeve. In this way, when conveying a medium that is easy to separate solid and liquid, since the cavity cross-section of the connecting tee is larger than the cavity cross-section between the screw sleeve and the screw, the flow rate of the medium in the cavity of the connecting tee will be lower than the flow rate in the screw sleeve, which is easy to cause solid medium deposition and then solid-liquid separation;

[0012] The difference of this scheme is that: this scheme sets the feed end of the medium on the side of the screw sleeve away from the connecting tee, and the height of the feed end gradually decreases. Under the action of pressure, the flow rate of the medium at the feed end will gradually increase, making it difficult for solid particles in the medium to deposit at the feed end; and the discharge end is the end of the connecting tee close to the base, and the medium is more likely to flow out from the discharge end, effectively reducing the possibility of solid particles depositing in the connecting tee. By replacing the feed end and the discharge end of the single-screw pump and improving the feed end, solid-liquid separation of the medium is effectively avoided.

[0013] Preferably, the coupling unit includes a coupling, both ends of which are respectively connected to the output end of the driving motor and one end of the universal joint, and a shaft seal is provided at the connection between the coupling and the universal joint. The beneficial effect of this embodiment is that, through the setting of the shaft seal, it is possible to effectively prevent the medium from entering the coupling from the connection between the universal joint and the coupling, thereby affecting its service life.

[0014] Preferably, the inner wall of the connecting tee close to the base is an inclined wall; the two ends of the inclined wall connected to the coupling unit and the screw sleeve are respectively inclined toward the side close to the base, and then connected to the discharge end; the beneficial effect of this preferred embodiment is: through the inclined setting of the connecting tee close to the base, the material can flow into the discharge end more easily, thereby avoiding the deposition of solid particles in the medium in the connecting tee.

[0015] Preferably, the inclined wall between the discharge end and the screw sleeve has an inclination angle of 20°-45° in the horizontal direction; the beneficial effect of this preferred embodiment is that setting the inclined wall on this side to this inclination angle can increase the flow rate of the medium in the connecting tee, thereby avoiding the medium from being deposited in the connecting tee and causing solid-liquid separation.

[0016] Preferably, the angle between the inclined wall between the discharge end and the coupling unit and the horizontal direction is 45°-60°; the beneficial effect of this preferred embodiment is that the setting of this inclination angle can prevent the medium from being deposited on the side of the connecting tee close to the coupling unit or metal particles from entering the connection, thereby affecting the connection between the universal joint and the coupling.

[0017] Preferably, the feed pipe is a reducer, and the inner diameter of the feed pipe gradually decreases on one side of the feed end; the beneficial effect of this preferred embodiment is that due to the change in the diameter of the feed pipe at the feed end, the pressure of the medium is further increased, thereby increasing the flow rate of the medium at the feed end, further reducing the possibility of medium deposition at the feed end.

[0018] Preferably, a reaction kettle is further included, wherein the feed port of the reaction kettle is connected to the discharge port via a flange, and the internal pressure of the reaction kettle is 0.8 MPa.

[0019] The beneficial effects of the utility model are:

[0020] 1. This solution sets the feed end of the medium on the side of the screw sleeve away from the connecting tee. By setting the height of the feed pipe at the feed end and improving the discharge end at the connecting tee, the solid particles in the medium are not easily deposited, thereby ensuring that the composition ratio of the medium will not change during transportation.

[0021] 2. The setting of the diameter change and height change of the feed pipe at the feed end increases the flow rate of the medium at the feed end and shortens the residence time of the medium at the feed end; the setting of the inclined surface of the discharge end of the connecting tee enables the medium to flow better from the connecting tee to the reactor, shortens the residence time of the material in the connecting tee, and avoids solid-liquid separation of the medium in the connecting tee.

[0022] 3. In this solution, since the medium will not be deposited in the connecting tee, and solid-liquid separation will not occur in the connecting tee, it is effectively prevented that heavy metal particles in the medium enter the various connection positions of the single-screw pump and affect the service life of the single-screw pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model.

[0024] Explanation of the reference numerals: base 1 , drive motor 2 , coupling unit 3 , universal joint 4 , screw 5 , screw sleeve 6 , feed end 61 , feed pipe 62 , connecting tee 7 , discharge end 71 , inclined wall 72 , reactor 73 . DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more explicit definition of the protection scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0026] Example:

[0027] like Figure 1 As shown:

[0028] A single screw pump for conveying a medium that is easily separated from solid and liquid comprises a base 1 arranged on a horizontal plane, on which a driving motor 2, a coupling unit 3, a universal joint 4 and a screw 5 are arranged in sequence from right to left; wherein the coupling unit 3 comprises a coupling 31, the right end of the coupling 31 is connected to the output end of the driving motor 2, the left end of the coupling 31 is connected to the right end of the universal joint 4, and the left end of the universal joint 4 is connected to the right end of the screw 5.

[0029] Specifically, a screw sleeve 6 is provided on the circumferential sleeve of the screw 5, and a connecting tee 7 is provided on the circumferential sleeve of the universal joint 4, wherein the connecting tee 7 includes left and right ends arranged horizontally and a discharge end 71 arranged vertically, the left end of the connecting tee and the right end of the screw sleeve 6 are connected by a flange, and the right end of the connecting tee 7 is connected to the left end of the coupling 31 by a flange, wherein a shaft seal is also provided at the connection between the coupling 31 and the universal joint, wherein the shaft seal is specifically a packing shaft seal; wherein the discharge end 71 is located at the bottom of the connecting tee 7, and specifically, the other end of the connecting tee is connected to a reactor 73 by a flange.

[0030] During implementation, the bottom of the connecting tee 7 is an inclined wall 72, wherein the inclined wall 72 is formed by the bottom of the connecting tee 7 being inclined downward toward the middle. Specifically, the discharge end 71 is located at the lowest point of the inclined wall 72, so that when the medium flows into the connecting tee 7, it flows directly from the discharge end 71 into the reactor 73, and there will be no stratification or solid-liquid separation caused by medium stoppage; specifically, the inclination angle of the left part of the inclined wall 72 is preferably 20°-45, and is 30° in the present embodiment, and the inclination angle of the right part of the inclined wall 72 is 45°-60°, and is 50° in the present solution. By setting the inclination angles on both sides, the flow rate of the medium in the connecting tee 7 can be increased, and the medium can be prevented from being retained in the connecting tee 7, thereby ensuring the normal operation of each connection position.

[0031] During implementation, the left end of the screw sleeve 6 is the feed end 61, wherein the feed end 61 is connected to a feed pipe 62, wherein the feed pipe 62 and the feed end 61 are connected by a flange; with respect to the feed pipe 62, its height gradually decreases from left to right to form a landslide structure, and the flow rate of the medium in the feed pipe 62 is faster; wherein, in order to make the flow rate of the medium faster, the inner diameter of the feed pipe 62 is successively reduced from left to right, and when its inner diameter is reduced, the pressure increases and the flow rate will also increase accordingly, thereby shortening the residence time of the medium, and under the action of pressure, the heavy metal particles in the medium are not easy to be separated by the liquid.

[0032] When the existing single-screw pump transports a mixed medium of heavy metal particles and heavy aromatics, since the cross-section inside the tee is larger than the cross-section of the screw sleeve, the flow rate of the medium in the tee is lower than the flow rate of the screw sleeve, resulting in the deposition of heavy metal particles, affecting the medium ratio, and the deposited heavy metal particles will damage the stator, rotor or mechanical seal in the tee.

[0033] The working principle of this solution mainly consists of two parts:

[0034] First, the feed end 61 and the discharge end 71 of the single screw pump of the present invention are opposite to those of the conventional single screw pump (the rotation direction of the screw 5 is also opposite), which directly avoids the deposition of the medium in the connecting tee 7 due to the flow rate difference, avoids the metal particles in the medium being retained in the connecting tee 7, thereby avoiding the imbalance of the ratio of solid and liquid in the medium, and also avoids the retained metal particles from entering each connection position to damage the single screw pump;

[0035] Secondly, the inner diameter and height setting of the feed pipe 62 of the present solution can increase the flow rate of the medium through the action of pressure, further avoiding the deposition of the medium in the feed end 61; at the same time, the setting of the inclined wall 72 connecting the bottom 7 of the tee can make the medium flow into the reactor 73 better, further avoiding the possibility of residual medium and ensuring the stability of the proportion of the medium.

[0036] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention shall be defined by the appended claims.

Claims

1. A single screw pump for conveying a medium that is easily separated from solid and liquid, comprising a horizontally arranged base (1), on which a driving motor (2), a coupling unit (3), a universal joint (4) and a screw (5) are arranged in sequence, a screw sleeve (6) is sleeved on the outer side of the screw (5), and a connecting tee (7) is sleeved on the outer side of the universal joint (4), characterized in that: The two ends of the horizontally arranged connecting tee (7) are respectively connected to the coupling unit (3) and the screw sleeve (6); the other end of the connecting tee (7) is a discharge end (71), and the discharge end (71) is located on a side close to the base (1); the other end of the screw sleeve (6) is a feed end (61), and the feed end (61) is connected to a feed pipe (62), and the height of the feed pipe (62) gradually decreases towards the feed end (61) until it is aligned with the feed end (61).

2. The single screw pump for conveying a medium that is easily separated from solid and liquid according to claim 1, characterized in that: The coupling unit (3) comprises a coupling (31), two ends of which are respectively connected to the output end of the drive motor (2) and one end of the universal joint (4), and a shaft seal is provided at the connection between the coupling (31) and the universal joint (4).

3. The single screw pump for conveying a medium that is easily separated from solid and liquid according to claim 1, characterized in that: The inner wall of the connecting tee (7) close to the base (1) is an inclined wall (72); the two ends of the inclined wall (72) connected to the coupling unit (3) and the screw sleeve (6) are respectively inclined toward the side close to the base (1) and then connected to the discharge end (71).

4. The single screw pump for conveying a medium that is easily separated from solid and liquid according to claim 3, characterized in that: The inclined wall (72) between the discharge end (71) and the screw sleeve (6) has an inclination angle of 20°-45° in the horizontal direction.

5. The single screw pump for conveying a medium that is easily separated from solid and liquid according to claim 3, characterized in that: The angle between the inclined wall (72) between the discharge end (71) and the coupling unit (3) and the horizontal direction is 45°-60°.

6. The single screw pump for conveying a medium that is easily separated from solid and liquid according to claim 1, characterized in that: The feed pipe (62) is a reducer, and the inner diameter of the feed pipe (62) gradually decreases on one side of the feed end (61).

7. The single screw pump for conveying a medium that is easily separated from solid and liquid according to claim 1, characterized in that: It also includes a reaction kettle (73), wherein the feed inlet of the reaction kettle (73) is connected to the discharge end (71) via a flange.

8. The single screw pump for conveying a medium that is easily separated from solid and liquid according to claim 7, characterized in that: The internal pressure of the reactor (73) is 0.8 MPa.

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