Diesel oil conveying three-screw pump

Abstract

The utility model discloses a diesel oil delivery three-screw pump which comprises a pump body and a pump sleeve arranged in the pump body, a partition ring is arranged between the outer side of the pump sleeve and the inner wall of the pump body, the partition ring divides an inner cavity of the pump body into an oil inlet cavity and an oil outlet cavity, an inlet flange and a front end cover are arranged at the two ends of the pump body respectively, and the front end cover is arranged on the pump body. The outer end of the front end cover is provided with a bearing seat, the inner end of the front end cover is provided with a slave screw bushing, the front end cover is rotationally provided with a main screw, the inner end of the main screw extends into the pump body, the outer end of the main screw is inserted into the bearing seat, slave screws are arranged on the upper side and the lower side of the main screw, and the front ends of the slave screws are rotationally arranged in the slave screw bushing; the main screw is meshed with the auxiliary screws on the two sides, a channel opening communicated with the oil outlet cavity is formed in the side face of the front end of the pump sleeve, and an outlet flange communicated with the oil outlet cavity is arranged on the outer side of the pump body.

Description

Technical Field

[0001] This utility model relates to the field of screw pumps, specifically to a three-screw pump for diesel delivery. Background Technology

[0002] As a type of positive displacement rotary pump, the screw pump achieves fluid transport through the volume change of the sealed cavity formed by the meshing of screws, and has advantages such as stable pressure and low pulsation.

[0003] Chinese patent CN218454820U discloses a three-screw pump for high-viscosity raw materials, including a three-screw pump body. A discharge pipe is fixed on the lower surface of the three-screw pump body, a feed pipe is fixed on the upper surface of the three-screw pump body, and a conveying pipe is fixed on the upper surface of the feed pipe. A sealing mechanism for fixing the conveying pipe and the feed pipe is provided on the outside of the feed pipe. A motor for starting the three-screw pump body is fixed on the right side of the three-screw pump body, and a disassembly mechanism for assisting in cleaning residues is provided on the left side of the three-screw pump body.

[0004] The three-screw pump used for high-viscosity raw materials has a side-inlet and side-outlet conveying path. During the fluid conveying process, the fluid needs to go through multiple bends to reach the end of the main screw or the driven screw. The fluid also enters from one side, resulting in differences in fluid velocity and flow rate at the two driven screw positions. This difference will reduce the overall operational stability of the pump and affect the conveying effect. Utility Model Content

[0005] The purpose of this invention is to provide a diesel delivery three-screw pump with a straight-in, side-out delivery path, which provides better delivery performance for diesel.

[0006] To achieve the above objectives, this utility model provides a diesel delivery three-screw pump, including a pump body and a pump sleeve disposed within the pump body. A partition ring is provided between the outer side of the pump sleeve and the inner wall of the pump body, dividing the inner cavity of the pump body into an oil inlet chamber and an oil outlet chamber. An inlet flange and a front end cover are respectively provided at both ends of the pump body. A bearing seat is installed at the outer end of the front end cover, and a driven screw bushing is installed at the inner end. A main screw is rotatably mounted on the front end cover, with its inner end extending into the pump body and its outer end inserted into the bearing seat. Driven screws are provided on the upper and lower sides of the main screw, with the front ends of the driven screws rotatably mounted in the driven screw bushings. The main screw and the driven screws on both sides mesh with each other. A channel opening communicating with the oil outlet chamber is provided on the front side of the pump sleeve, and an outlet flange communicating with the oil outlet chamber is provided on the outer side of the pump body.

[0007] Preferably, a safety valve connected to the oil outlet chamber is installed on the left or right side of the pump body; a base is installed at the bottom of the pump body.

[0008] Preferably, a bearing is nested at the front end of the bearing housing; a mechanical seal is provided between the front end cover and the main screw.

[0009] Preferably, the mechanical seal portion is inserted into the bearing housing.

[0010] Preferably, a skeleton seal is provided between the bearing housing and the main screw on the inner side of the bearing.

[0011] Preferably, the pump body has a plurality of first screw holes at its rear end; the inlet flange has a plurality of first screws threaded into the first screw holes along its circumferential direction.

[0012] Preferably, the pump body has a plurality of second screw holes at its front end; the front end cover has a plurality of second screws screwed into the second screw holes along its circumferential direction.

[0013] Preferably, the bearing housing is mounted on the outside of the front end cover by a plurality of third screws.

[0014] According to the above technical solution, this utility model provides a diesel delivery three-screw pump, including a pump body and a pump sleeve disposed within the pump body. A partition ring is provided between the outer side of the pump sleeve and the inner wall of the pump body, and the partition ring divides the inner cavity of the pump body into an oil inlet chamber and an oil outlet chamber. An inlet flange and a front end cover are respectively provided at both ends of the pump body. A bearing seat is installed at the outer end of the front end cover, and a driven screw bushing is installed at the inner end. A main screw is rotatably installed on the front end cover. The inner end of the main screw extends into the pump body, and the outer end is inserted into the bearing seat. Driven screws are provided on the upper and lower sides of the main screw. The front end of the driven screw is rotatably installed in the driven screw bushing. The main screw and the driven screws on both sides mesh with each other. A channel opening communicating with the oil outlet chamber is provided on the front side of the pump sleeve, and an outlet flange communicating with the oil outlet chamber is provided on the outer side of the pump body.

[0015] This diesel transfer three-screw pump features a straight-in, side-out delivery path. When diesel enters the end position of the three screws at the inlet, the fluid does not need to bend. The two screw ends have identical structures and the same inlet flow rate. When flowing through them, the flow rate and velocity at both points are comparable, resulting in more stable overall operation of the screw pump and better delivery performance for diesel.

[0016] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a longitudinal cross-sectional view of a preferred embodiment of a diesel delivery three-screw pump;

[0019] Figure 2 This is a cross-sectional view of a preferred embodiment of a diesel delivery three-screw pump;

[0020] Figure 3 This is a left view of a preferred embodiment of a diesel delivery three-screw pump;

[0021] Figure 4 This is a schematic diagram of the meshing and engagement between the master screw and the slave screw.

[0022] Explanation of reference numerals in the attached figures

[0023] 1-Inlet flange; 2-Pump body; 3-Pump sleeve; 4-Main screw; 5-Front end cover; 6-Bearing housing; 7-Bearing; 8-Skeleton seal; 9-Mechanical seal; 10-Dieter screw bushing; 11-Dieter screw; 12-Base; 13-Safety valve; 14-Isolation ring; 15-Outlet flange; 16-Oil outlet chamber; 17-Passage port; 18-Oil inlet chamber; 19-First screw; 20-Second screw; 21-Third screw. Detailed Implementation

[0024] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0025] In this utility model, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside" in the terminology only represent the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as a limitation on the term.

[0026] See Figure 1-4The diesel delivery three-screw pump shown includes a pump body 2 and a pump sleeve 3 disposed within the pump body 2. A partition ring 14 is provided between the outer side of the pump sleeve 3 and the inner wall of the pump body 2. The partition ring 14 divides the inner cavity of the pump body 2 into an inlet chamber 18 and an outlet chamber 16. An inlet flange 1 and a front end cover 5 are respectively provided at both ends of the pump body 2. A bearing seat 6 is installed at the outer end of the front end cover 5, and a screw bushing 10 is installed at the inner end. A main screw is rotatably mounted on the front end cover 5. The main screw 4 has its inner end extending into the pump body 2 and its outer end inserted into the bearing seat 6. The main screw 4 has slave screws 11 on its upper and lower sides. The front end of the slave screw 11 is rotatably installed in the slave screw bushing 10. The main screw 4 and the slave screws 11 on both sides mesh with each other. The front side of the pump sleeve 3 has a channel port 17 that communicates with the oil outlet chamber 16. The pump body 2 has an outlet flange 15 that communicates with the oil outlet chamber 16 on its outer side.

[0027] When the diesel three-screw pump is working, the drive motor connected to the outer end of the main screw 4 drives the main screw 4 to rotate. Since the main screw 4 is meshed with the driven screws 11 on both sides, it drives the driven screws 11 on both sides to rotate. At this time, the diesel in the oil inlet chamber 18 is transported towards the front end under the rotation of the driven screws 11 until it is transported to the channel port 17. The diesel is further transported to the oil outlet chamber 16, filling the oil outlet chamber 16, and finally output through the outlet flange 15.

[0028] This diesel transfer three-screw pump features a straight-in, side-out delivery path. When diesel enters the end position of the three screws at the inlet, the fluid does not need to bend. The two ends of the screws 11 have identical structures and the same inlet flow rate. When flowing through them, the flow rate and velocity at both points are comparable, resulting in a more stable overall operation of the screw pump and better delivery performance for diesel.

[0029] In this embodiment, a safety valve 13 connected to the oil outlet chamber 16 is installed on the left or right side of the pump body 2; a base 12 is installed at the bottom of the pump body 2. With this arrangement, when the hydraulic pressure in the oil outlet chamber 16 is too high and exceeds the safe pressure, the safety valve 13 is used to release the pressure, thereby increasing safety.

[0030] In this embodiment, a bearing 7 is nested at the front end of the bearing housing 6; a mechanical seal 9 is provided between the front end cover 5 and the main screw 4. The mechanical seal 9 enhances the sealing performance.

[0031] In this embodiment, to further enhance sealing performance, the mechanical seal 9 is partially inserted into the bearing housing 6.

[0032] In this embodiment, to increase the sealing between the bearing housing 6 and the main screw 4 and prevent leakage through the bearing 7, a skeleton seal 8 is provided on the inner side of the bearing 7 between the bearing housing 6 and the main screw 4. The skeleton seal 8 and the main screw 4 are in a sealing fit.

[0033] In this embodiment, the pump body 2 has a plurality of first threaded holes at its rear end; the inlet flange 1 has a plurality of first screws 19 threaded into the first threaded holes along its circumference. This arrangement makes the inlet flange 1 easy to disassemble and replace.

[0034] In this embodiment, the pump body 2 has a plurality of second screw holes at its front end; the front cover 5 has a plurality of second screws 20 screwed into the second screw holes along its circumferential direction. This arrangement makes the front cover 5 easy to disassemble and replace.

[0035] In this embodiment, the bearing housing 6 is mounted on the outside of the front end cover 5 by a plurality of third screws 21. This arrangement facilitates the disassembly and replacement of the bearing housing 6.

[0036] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0037] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0038] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A diesel fuel transfer three-screw pump, characterized in that, The diesel delivery three-screw pump includes a pump body (2) and a pump sleeve (3) disposed within the pump body (2). A partition ring (14) is provided between the outer side of the pump sleeve (3) and the inner wall of the pump body (2). The partition ring (14) divides the inner cavity of the pump body (2) into an oil inlet chamber (18) and an oil outlet chamber (16). An inlet flange (1) and a front end cover (5) are respectively provided at both ends of the pump body (2). A bearing seat (6) is installed at the outer end of the front end cover (5), and a screw bushing (10) is installed at the inner end. A main screw bushing is rotatably mounted on the front end cover (5). The main screw (4) has its inner end inserted into the pump body (2) and its outer end inserted into the bearing seat (6). The main screw (4) has slave screws (11) on its upper and lower sides. The front end of the slave screw (11) is rotatably installed in the slave screw bushing (10). The main screw (4) and the slave screws (11) on both sides mesh with each other. The pump sleeve (3) has a channel (17) on its front side that connects to the oil outlet chamber (16). The pump body (2) has an outlet flange (15) on its outer side that connects to the oil outlet chamber (16).

2. The diesel fuel delivery three-screw pump according to claim 1, characterized in that, A safety valve (13) connected to the oil outlet chamber (16) is installed on the left or right side of the pump body (2); The pump body (2) is fitted with a base (12) at its bottom.

3. The diesel fuel delivery three-screw pump according to claim 1, characterized in that, The bearing housing (6) is nested with a bearing (7) at its front end; A mechanical seal (9) is provided between the front end cover (5) and the main screw (4).

4. The diesel fuel delivery three-screw pump according to claim 3, characterized in that, The mechanical seal (9) is partially inserted into the bearing housing (6).

5. The diesel fuel transfer three-screw pump according to claim 3, characterized in that, A skeleton seal (8) is provided between the bearing housing (6) and the main screw (4) on the inner side of the bearing (7).

6. The diesel fuel delivery three-screw pump according to claim 1, characterized in that, The pump body (2) has multiple first screw holes at its rear end; The inlet flange (1) is provided with a plurality of first screws (19) threaded into the first screw hole along the circumferential direction.

7. The diesel fuel delivery three-screw pump according to claim 1, characterized in that, The pump body (2) has multiple second screw holes at its front end; The front end cover (5) is provided with a plurality of second screws (20) screwed into the second screw hole along the circumferential direction.

8. The diesel fuel delivery three-screw pump according to claim 1, characterized in that, The bearing housing (6) is mounted on the outside of the front cover (5) by a plurality of third screws (21).

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