A compact pump unit without bearing chamber

Abstract

The utility model discloses a pump group with a compact structure without a bearing chamber, which is characterized in that it comprises: a shell structure, an impeller structure, a bearing structure and a driving structure; the impeller structure is arranged in the shell structure, and is connected with the driving structure arranged outside the shell structure through the bearing structure, and the driving structure drives the impeller structure to rotate through the bearing structure; wherein the bearing structure comprises: a guide vane, a base of which is fixed on the shell structure and is located directly below the impeller structure, and bears the axial force of the pump group; a plurality of groups of bearing shells are evenly distributed around the impeller structure, each group of the bearing shells comprises an upper bearing shell and a lower bearing shell, the upper bearing shell and the lower bearing shell are symmetrically arranged on both sides of the impeller structure, the upper bearing shell is fixed on the shell structure, and the lower bearing shell is fixed on the guide vane through a connecting piece, and bears the axial force of the pump group.

Description

Technical Field

[0001] The utility model relates to the field of mechanical engineering, in particular to a compact structure pump group without a bearing chamber. Background Art

[0002] A pump unit refers to a motor, pump, reducer and auxiliary devices installed together to form a whole, which is used to transport fluids such as liquids or gases to a specific location. It can not only improve production efficiency, but also reduce energy waste and environmental pollution. It is widely used in petroleum, chemical, pharmaceutical, textile, metallurgy, mining and other industries.

[0003] At present, the conventional pump structure generally includes: pump body, bearing chamber, motor. This type of pump structure has more parts, which increases the production cost of the pump in terms of installation, raw materials, processing, etc., and also increases the difficulty of installation and maintenance; at the same time, the volume and overall mass of the pump are also larger, occupying a larger installation space in the axial direction, and requiring more process steps in installation and use. Utility Model Content

[0004] The utility model aims to provide a compact pump unit without a bearing chamber, which utilizes a bearing structure to bear the axial force and radial force generated during the operation of the pump unit, thereby effectively reducing the number of parts and volume of the pump unit.

[0005] In order to achieve the above-mentioned object, the utility model provides a compact structure pump unit without a bearing chamber, comprising: a housing structure, an impeller structure, a bearing structure and a driving structure; the impeller structure is arranged in the housing structure, and is connected to a driving structure arranged outside the housing structure through the bearing structure, and the driving structure drives the impeller structure to rotate through the bearing structure;

[0006] Wherein, the bearing structure comprises:

[0007] A guide vane, the base of which is fixed on the shell structure and is located directly below the impeller structure to bear the axial force of the pump group;

[0008] A plurality of groups of bearings are evenly distributed around the impeller structure, each group of bearings comprises an upper bearing and a lower bearing, the upper bearing and the lower bearing are symmetrically arranged on both sides of the impeller structure, the upper bearing is fixed to the shell structure, and the lower bearing is fixed to the guide vane through a connecting piece to bear the axial force of the pump group;

[0009] A connecting shaft, a first end of which is connected to the driving structure, and a second end of which is connected to the impeller structure;

[0010] A radial bearing is arranged outside the first end of the connecting shaft, and its two ends are respectively connected to the casing structure and the impeller structure to bear the radial force of the pump group.

[0011] Optionally, the housing structure comprises:

[0012] The pump housing is a semi-enclosed structure without a top cover, and two first through holes are respectively provided on the bottom surface and the side surface for the inlet and outlet of the fluid;

[0013] The pump cover is arranged on the top of the pump housing and is fixedly connected to the pump housing, and a second through hole is provided at the center of the pump cover to install the driving structure.

[0014] Optionally, a plurality of slots are provided at the edge of the inner surface of the pump cover, and each of the upper bearing shells is correspondingly embedded and fixed in the slot.

[0015] Optionally, the driving structure is a motor, and the output shaft of the motor passes through the second through hole of the pump cover and extends into the interior of the pump casing, and is connected to the first end of the connecting shaft.

[0016] Optionally, the impeller structure includes an impeller, the impeller is arranged directly above the guide vane, a fourth through hole is provided along the axial direction of the impeller, and the second end of the connecting shaft is arranged through the fourth through hole of the impeller.

[0017] Optionally, the impeller structure further includes an impeller nut, which is fixedly connected to the second end of the connecting shaft to fix the impeller and the connecting shaft together.

[0018] Optionally, a first groove is provided on the impeller nut; a second groove is provided on the second end of the connecting shaft, and inner surfaces of the first groove and the second groove are both provided with thread structures.

[0019] Optionally, a key is further included, one end of which is inserted into the first groove and the other end of which is inserted into the second groove, so as to fix the impeller nut and the connecting shaft.

[0020] Optionally, one end surface of the key is provided with a thread structure corresponding to the inner surface of the second groove, and the other end surface of the key is provided with a thread structure corresponding to the inner surface of the first groove.

[0021] Optionally, a sealing structure is further included, wherein the sealing structure is arranged between the outer wall of the output shaft of the motor and the inner wall of the second through hole of the pump cover.

[0022] Compared with the prior art, the technical solution of the utility model has at least the following beneficial effects:

[0023] (1) The pump unit of the utility model utilizes the guide vanes and the bearings to bear the axial force generated by the impeller, and utilizes the radial bearings to bear the radial force generated by the impeller, thereby replacing the function of the bearing chamber in the original pump unit, making the overall structure of the pump unit more compact and simple, and also reducing the number of parts of the pump unit.

[0024] (2) The motor, bearing structure, key and pump cover in the pump unit of the utility model are always kept in a connected state. When the structure in the pump unit is repaired or replaced, the structure except the pump casing can be pulled out and installed as a whole, which saves the time of installing, replacing and repairing the pump unit.

[0025] (3) The bearing structures in the pump unit of the utility model all adopt sealed medium lubrication, which does not require an additional lubrication system and can rely on the pump unit's own liquid energy to form a lubrication path. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a compact pump unit without a bearing chamber according to the utility model.

[0027] In the figure, 1- pump casing, 2- guide vane, 3- lower bearing, 4- impeller, 5- upper bearing, 6- sealing structure, 7- pump cover, 8- impeller nut, 9- key, 10- connecting shaft, 11- radial bearing, 12- motor. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Figure 1 The schematic diagram of the structure of the compact pump unit without bearing chamber of the utility model is shown in FIG. The pump unit includes: a housing structure, a bearing structure, a motor 12, an impeller structure, a key 9 and a sealing structure 6. The housing structure carries the various components of the pump unit and is connected to the motor 12 through the sealing structure 6. The bearing structure is connected to the motor 12, and the impeller structure is connected to the bearing structure through the key 9. The motor 12 serves as a driving structure, which drives the bearing structure to rotate, and drives the impeller structure to rotate through the key 9.

[0032] The shell structure includes a pump housing 1 and a pump cover 7. The pump housing 1 is a semi-enclosed structure without a top cover. Two first through holes and a plurality of first mounting holes are provided on its surface. The two first through holes are respectively provided on the bottom surface and the side surface of the pump housing 1 for the entry and discharge of fluids. The plurality of first mounting holes are provided on the top edge of the pump housing 1 and are fixing holes of the pump housing 1. The pump cover 7 is provided on the top of the pump housing 1. A second through hole is provided at the center thereof for mounting the motor 12. The outer edge of the second through hole is provided with a plurality of second mounting holes, which are fixing holes of the motor 12, that is, the motor 12 is fixedly connected to the pump cover 7 by passing through the second mounting hole with a fixing member. The edge of the pump cover 7 is provided with a plurality of third through holes corresponding to the first mounting holes of the pump housing 1. The fixing member passes through the first mounting hole and the third through hole in sequence to connect the pump cover 7 to the pump housing 1. A plurality of slots are provided on the inner surface edge of the pump cover 7, and the plurality of slots are evenly arranged around the second through hole.

[0033] The output shaft of the motor 12 extends into the interior of the pump housing 1 through the second through hole on the pump cover 7 and is connected to the first end of the bearing structure.

[0034] The sealing structure 6 is disposed between the outer wall of the output shaft of the motor 12 and the inner wall of the second through hole of the pump cover 7 to seal the housing structure and prevent the fluid from flowing out.

[0035] The impeller structure includes an impeller 4 and an impeller nut 8 arranged inside the pump housing 1. A first groove is provided on the impeller nut 8, and a threaded structure is provided on the inner surface of the first groove, through which the impeller nut 8 and the second end of the bearing structure are connected. A fourth through hole is provided on the impeller 4 along its axial direction, so that the second end of the bearing structure can pass through the fourth through hole on the impeller 4, and further be fixedly connected with the impeller nut 8 by threads, so as to fix the impeller 4 and the bearing structure together. The kinetic energy of the fluid is increased by the circumferential rotation of the impeller 4; the impeller 4 can be selected as an open impeller, a closed impeller and a semi-open impeller according to user needs.

[0036] The bearing structure bears the axial force and radial force of the pump group, and adopts the form of sealed medium lubrication, without the need for an additional lubrication system. The bearing structure includes: a guide vane 2, a plurality of groups of bearing shells, a connecting shaft 10 and a radial bearing 11. The base of the guide vane 2 is fixed to the first through hole on the bottom surface of the pump casing 1. The guide vane 2 is a flow guide component, which is located directly below the impeller 4. It can reduce the flow rate of the fluid after passing through the impeller 4, convert the kinetic energy of the fluid into pressure energy, and bear the axial force generated by the rotation of the impeller 4. The first end of the connecting shaft 10 is connected to the output shaft of the motor 12, and the second end of the connecting shaft 10 passes through the fourth through hole on the impeller 4 to transmit the torque of the motor 12; the second end of the connecting shaft 10 is provided with a second groove along its axial direction, and the inner surface of the second groove is provided with a threaded structure. The plurality of groups of bearings are evenly distributed around the impeller 4. Each group of bearings consists of an upper bearing 5 and a lower bearing 3. The upper bearings 5 ​​are respectively arranged in the respective slots on the pump cover 7 and are arranged above the impeller 4 after being limited by the slots. The lower bearings 3 are arranged between the impeller 4 and the guide vanes 2 and are symmetrically arranged with the respective upper bearings 5. Each lower bearing 3 is fixedly connected to the guide vanes 2 through a connecting member (such as a pin), that is, one end of the connecting member is fixedly connected to the lower bearing 3 and the other end is fixedly connected to the upper surface of the guide vanes 2. The bearings are used to limit the impeller 4 and bear the axial force generated by the impeller 4. The number and size of the bearings are determined according to the magnitude of the axial force generated by the impeller. The plurality of groups of bearings are evenly distributed around the impeller 4. The radial bearing 11 is arranged on the outer side of the first end of the connecting shaft 10. The two ends of the radial bearing 11 are respectively connected to the impeller 4 and the pump cover 7 to bear the radial force generated by the impeller 4.

[0037] The key 9 is fixedly connected to the connecting shaft 10, and one end surface of the key 9 is provided with a threaded structure corresponding to the inner surface of the second groove of the connecting shaft 10, and can be inserted into the second groove of the connecting shaft 10, and the other end surface is provided with a threaded structure corresponding to the inner surface of the first groove of the impeller nut 8, and can be inserted into the first groove of the impeller nut 8, so that the key 9, the connecting shaft 10 and the impeller nut 8 are connected, and the impeller 4 is fixed to the connecting shaft 10 through the impeller nut 8, so that the torque of the connecting shaft 10 is transmitted to the impeller 4.

[0038] The pump unit is provided with torque by the motor 12, and the torque is transmitted in sequence by the connecting shaft 10, the key 9 and the impeller nut 8, driving the impeller 4 mounted on the connecting shaft 10 to rotate circumferentially, doing work on the fluid in the pump housing 1, and providing kinetic energy for the fluid. In the embodiment of the pump unit with a short structure, the structure of the connecting shaft 10 and the key 9 will not be used, and the output shaft of the motor 12 is directly connected to the impeller nut 8, and the torque generated by the motor 12 is directly transmitted to the impeller nut 8, so that the impeller 4 mounted on the output shaft of the motor 12 rotates circumferentially; in the embodiment of the pump unit with a long structure, the output shaft of the motor 12 and the connecting shaft 10 are connected together by a coupling, and the torque generated by the motor 12 is transmitted in sequence through the coupling, the connecting shaft 10, the key 9 and the impeller nut 8, and drives the impeller 4 mounted on the connecting shaft 10 to rotate circumferentially.

[0039] The pump unit is installed on the use circuit. The transported fluid flows in from the first through hole (inlet) on the side surface of the pump housing 1, flows through the impeller 4, and after the impeller 4 does work on the fluid to increase the kinetic energy of the fluid, it flows to the guide vane 2, and after the guide vane 2 converts the kinetic energy of the fluid into pressure energy, it passes through the first through hole (outlet) on the bottom surface of the pump housing 1, flows out of the pump unit, and finally flows into the circuit pipeline.

[0040] During use of the pump set of the utility model, the guide vane 2, bearing bush, impeller 4, sealing mechanism 6, pump cover 7, impeller nut 8, key 9, connecting shaft 10, radial bearing 11 and motor 12 can be replaced as a whole component. Among them, the bearing bush can be replaced separately as a spare part.

[0041] To sum up, the pump unit of the utility model utilizes guide vanes and bearings to bear the axial force generated by the impeller, and utilizes radial bearings to bear the radial force generated by the impeller, thereby replacing the function performed by the bearing chamber in the original pump unit, making the overall structure of the pump unit more compact and simple, and reducing the number of parts of the pump unit; the structure outside the casing is regarded as an integral component, saving time for installation, replacement, and maintenance.

[0042] Although the content of the utility model has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the utility model. After reading the above content, various modifications and substitutions of the utility model will be obvious to those skilled in the art. Therefore, the protection scope of the utility model should be limited by the attached claims.

Claims

1. A compact pump unit without a bearing chamber, characterized in that: include: A casing structure, an impeller structure, a bearing structure and a driving structure; the impeller structure is arranged in the casing structure, and is connected to a driving structure arranged outside the casing structure through the bearing structure, and the driving structure drives the impeller structure to rotate through the bearing structure; Wherein, the bearing structure comprises: A guide vane, the base of which is fixed on the casing structure and is located directly below the impeller structure to bear the axial force of the pump unit; A plurality of groups of bearings are evenly distributed around the impeller structure, each group of bearings comprises an upper bearing and a lower bearing, the upper bearing and the lower bearing are symmetrically arranged on both sides of the impeller structure, the upper bearing is fixed to the shell structure, and the lower bearing is fixed to the guide vane through a connecting piece to bear the axial force of the pump group; A connecting shaft, a first end of which is connected to the driving structure, and a second end of which is connected to the impeller structure; A radial bearing is arranged outside the first end of the connecting shaft, and its two ends are respectively connected to the casing structure and the impeller structure to bear the radial force of the pump group.

2. The compact structure pump unit without bearing chamber according to claim 1 is characterized in that: The housing structure comprises: The pump housing is a semi-enclosed structure without a top cover, and two first through holes are respectively provided on the bottom surface and the side surface for the inlet and outlet of the fluid; The pump cover is arranged on the top of the pump housing and is fixedly connected to the pump housing, and a second through hole is provided at the center of the pump cover to install the driving structure.

3. The compact structure pump unit without bearing chamber according to claim 2, characterized in that: A plurality of slots are provided at the inner surface edge of the pump cover, and each of the upper bearing shells is correspondingly embedded and fixed in the slot.

4. The compact structure pump unit without bearing chamber according to claim 2, characterized in that: The driving structure is a motor, and the output shaft of the motor passes through the second through hole of the pump cover and extends into the interior of the pump housing, and is connected to the first end of the connecting shaft.

5. The compact structure pump unit without bearing chamber according to claim 1, characterized in that: The impeller structure comprises an impeller, which is arranged directly above the guide vane. A fourth through hole is arranged along the axial direction of the impeller, and the second end of the connecting shaft is arranged through the fourth through hole of the impeller.

6. The compact structure pump unit without bearing chamber according to claim 5, characterized in that: The impeller structure also includes an impeller nut, which is fixedly connected to the second end of the connecting shaft to fix the impeller and the connecting shaft together.

7. The compact structure pump unit without bearing chamber according to claim 6, characterized in that: The impeller nut is provided with a first groove; the second end of the connecting shaft is provided with a second groove, and the inner surfaces of the first groove and the second groove are both provided with thread structures.

8. The compact structure pump unit without bearing chamber according to claim 7, characterized in that: It also includes a key, one end of which is inserted into the first groove and the other end of which is inserted into the second groove, so as to fix the impeller nut and the connecting shaft.

9. The compact structure pump unit without bearing chamber according to claim 8, characterized in that: One end surface of the key is provided with a thread structure corresponding to the inner surface of the second groove, and the other end surface of the key is provided with a thread structure corresponding to the inner surface of the first groove.

10. The compact structure pump unit without bearing chamber according to claim 4, characterized in that: It also includes a sealing structure, which is arranged between the outer wall of the output shaft of the motor and the inner wall of the second through hole of the pump cover.

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