A new type of liquid return system for gear pumps

Abstract

The present invention provides a novel liquid return system for a gear pump. By providing a connection channel at the upper end of each bushing, the other end of the connection channel is connected to an auxiliary pipeline, and the auxiliary pipeline communicates with the liquid inlet pipeline and the liquid suction port. One end of each connection channel is connected to the upper end of the bushing, and the other end is connected to the auxiliary pipeline, so that a circulation channel is formed by the bushing, the liquid inlet pipeline, the auxiliary pipeline, the connection channel and the liquid suction port of the cavity; or when a connection channel is provided at the upper end of one of the bushings, a first central pipeline is provided in the middle of the shaft rod in the other bushing. Since the auxiliary pipeline is a vertical pipeline, the volume is reduced by 20% compared with the existing gear pump. At the same time, the vertical pipeline can be directly molded by a mold without fine processing, and it is also difficult to handle the burrs generated by the processing of the inclined pipeline. Therefore, the cost is greatly saved and the product volume is reduced, making it more advantageous to use in a narrow space.

Description

Technical Field

[0001] The present invention belongs to the technical field of gear pumps, and more specifically, relates to a novel liquid return system for a gear pump. Background Art

[0002] Working principle of a gear pump: Two gears of the same size rotate meshingly with each other in a closely-fitted housing. The interior of this housing is similar to the shape of an "8". The two gears are installed inside, and the outer diameter and both sides of the gears are closely fitted with the housing. The material from the extruder enters the space between the two gears at the suction port and fills this space. As the teeth rotate, it moves along the housing and is finally discharged when the two teeth mesh. A gear pump is also called a positive displacement device. Just like a piston in a cylinder, when one tooth enters the fluid space of another tooth, since the liquid is incompressible, the liquid and the tooth cannot occupy the same space at the same time. In this way, the liquid is mechanically squeezed out. The gear pump is driven by an independent motor, which can effectively block the upstream pressure pulsation and flow fluctuation. The pressure pulsation at the outlet of the gear pump can be controlled within 1%. By using a gear pump on an extrusion production line, the flow output speed can be increased, and the shear and residence time of the material in the extruder can be reduced.

[0003] The existing gear pump consists of a base, an intermediate plate, two sets of meshing pump shafts and an upper cover plate. Since the rotation of the pump shaft requires a certain clearance, the liquid will flow along the shaft rod into the shaft sleeve of the upper cover plate or into the storage tank of the base. How to make the liquid in the shaft sleeve and the storage tank have a circulation channel to the cavity of the intermediate plate? Generally, there are two methods. One is to penetrate the shaft sleeve through the side wall of the liquid inlet pipe, so that the shaft sleeve, the liquid inlet pipe and the liquid suction port of the cavity form a circulation channel. The other is to drill an inclined hole in the shaft sleeve and the liquid suction port of the cavity respectively, and form a circulation channel through the inclined hole, the shaft sleeve and the liquid suction port of the cavity. However, the gear pump adopting the above methods is too large in volume and too high in cost, and the gear pump needs to be installed in the control box of the entire tail gas treatment system. The installation space is narrow, and the size of the gear pump almost determines the size of the entire control system. At present, automotive parts are developing towards miniaturization and lightweight. To ensure the normal function of the urea system parts and to meet the assessments such as the durability of the urea system parts and the vehicle passability, it is necessary to reasonably arrange the installation of the urea system parts, which poses a huge challenge to the design of the urea system parts. Summary of the Invention

[0004] In view of this, in order to solve the problems of excessive volume and high cost of gear pumps, the present invention proposes a new type of gear pump liquid return system, including: a base, an intermediate plate and an upper cover plate. By providing a connection channel at the upper end of each shaft sleeve, the other end of the connection channel is connected with an auxiliary pipeline, and the auxiliary pipeline communicates with the liquid inlet pipeline and the liquid suction port. One end of each connection channel is connected to the upper end of the shaft sleeve, and the other end is connected to the auxiliary pipeline, so that the liquid suction of the shaft sleeve, the liquid inlet pipeline, the auxiliary pipeline, the connection channel and the cavity forms a circulation channel; or when a connection channel is provided at the upper end of one of the shaft sleeves, a first central pipeline is provided in the middle of the shaft rod in the other shaft sleeve, so that the first central pipeline, the shaft sleeve and the storage tank form a circulation channel. Since the auxiliary pipeline is a vertical pipeline, the volume is reduced by 20% compared with the existing gear pump. At the same time, the vertical pipeline can be directly formed by a mold, without fine processing, and it is not easy to handle the burrs generated by the processing of the inclined pipeline. Therefore, the cost is greatly saved and the product volume is reduced, which has more advantages when used in a narrow space.

[0005] A new type of gear pump liquid return system, including: an upper cover plate 1, an intermediate plate 8, a base 12 and a motor rotor 16. The upper cover plate 1, the intermediate plate 8, the base 12 and the motor rotor 16 are connected in sequence. There are two shaft sleeve holes 2 at the lower part of the upper cover plate 1, a liquid inlet 3 and a liquid outlet 4 are provided on the side wall of the upper cover plate 1. A cavity 9 is provided in the middle of the intermediate plate 8, a liquid suction port 10 and a liquid discharge port 11 are provided on both sides of the cavity 9. The liquid inlet 3 is connected with the liquid suction port 10 through a liquid inlet pipeline, and the liquid outlet 4 is connected with the liquid discharge port 11 through a liquid discharge pipeline. A storage tank 13 is provided in the base 12, and two pump shafts 17 are provided in the middle of the cavity 9. The pump shaft 17 includes a shaft rod 18 and a gear 19 fixed on the shaft rod 18. The two gears 19 are meshed. The upper end of the shaft rod 18 is placed in its corresponding shaft sleeve, and the lower end of the shaft rod 18 is placed in the storage tank 13. The lower end of one of the shaft rods 18 is connected to the motor rotor 16 shaft of the motor rotor 16. It is characterized in that: a connection channel 6 is provided at the upper end of any shaft sleeve, and a corresponding connection channel 6 is provided in the other shaft sleeve or a first central pipeline 22 is provided in the middle of the shaft rod 18 in the other shaft sleeve.

[0006] Further, when a connection channel 6 is provided at the upper end of each shaft sleeve, the other end of the connection channel 6 is connected with an auxiliary pipeline 5, and the auxiliary pipeline 5 communicates with the liquid inlet pipeline and the liquid suction port 10. One end of each connection channel 6 is connected to the upper end of the shaft sleeve, and the other end is connected to the auxiliary pipeline 5, so that the shaft sleeve, the liquid inlet pipeline, the auxiliary pipeline 5, the connection channel 6 and the liquid suction port 10 of the cavity 9 form a circulation channel.

[0007] Further, the auxiliary pipeline 5 is arranged parallel to the shaft sleeve at an interval.

[0008] Further, when a connection channel 6 is provided at the upper end of one of the bushings, a first central pipe 22 is provided in the middle of the shaft rod 18 in the other bushing, so that the first central pipe 22, the bushing and the storage tank 13 form a circulation channel.

[0009] Further, an upper end cover 7 is provided at the top end of the upper cover plate 1, and the upper end cover 7 is fixedly connected to the top end of the upper cover plate 1, so that the auxiliary pipe 5, the connection channel 6 and the upper end of the bushing are sealed to form a semi-sealed structure.

[0010] Further, the auxiliary pipe 5 is in a groove shape or a round pipe shape, preferably a round pipe shape, and the connection channel 6 is in a groove shape or a round pipe shape, preferably a groove shape.

[0011] Further, a base liquid return pipe 14 is further provided on the base 12. One end of the base liquid return pipe 14 is connected to the storage tank 13, and the other end of the base liquid return pipe 14 is connected to the cavity 9, so that the liquid remaining in the storage tank 13 is circulated to the cavity 9 through the base liquid return pipe 14 for recycling.

[0012] Further, a triangular fixing member 15 is provided on the outer edge of the base 12, and the gear pump is fixed on the motor stator 21 through the triangular fixing member 15.

[0013] Further, a winding skeleton 20 is provided around the motor rotor 16, and the winding skeleton 20 is fixed on the inner wall of the motor stator 21.

[0014] Further, a washer 23 or a gasket is provided on the outer periphery of the motor stator 21 close to the triangular fixing member 15, so that the motor stator 21 and the triangular fixing member 15 are fixed more firmly.

[0015] Advantages of the present invention: The present invention provides a novel gear pump liquid return system, including: a base 12, an intermediate plate 8 and an upper cover plate 1. By providing a connection channel 6 at the upper end of each bushing, the other end of the connection channel 6 is connected to an auxiliary pipe 5, and the auxiliary pipe 5 communicates with the liquid inlet pipe and the liquid suction port 10. One end of each connection channel 6 is connected to the upper end of the bushing, and the other end is connected to the auxiliary pipe 5, so that the bushing, the liquid inlet pipe, the auxiliary pipe 5, the connection channel 6 and the liquid suction port 10 of the cavity 9 form a circulation channel; or when a connection channel 6 is provided at the upper end of one of the bushings, a first central pipe 22 is provided in the middle of the shaft rod 18 in the other bushing, so that the first central pipe 22, the bushing and the storage tank 13 form a circulation channel. Since the auxiliary pipe 5 is a vertical pipe, the volume is reduced by 20% compared with the existing gear pump. At the same time, the vertical pipe can be directly molded by the mold, without the need for fine processing, and it is not easy to handle the burrs generated by the processing of the inclined pipe. Therefore, the cost is greatly saved and the product volume is reduced, which has more advantages when used in a narrow space. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of a new liquid return system for a gear pump.

[0017] Figure 2 It is a schematic bottom view structural diagram of the upper cover plate of a new liquid return system for a gear pump.

[0018] Figure 3 It is a schematic structural diagram of the intermediate plate of a new liquid return system for a gear pump.

[0019] Figure 4 It is a schematic structural diagram of the base of a new liquid return system for a gear pump.

[0020] Figure 5 It is a schematic diagram of the local connection structure of a new liquid return system for a gear pump.

[0021] Figure 6 It is an exploded view of the specific implementation mode 1 of a new liquid return system for a gear pump.

[0022] Figure 7 It is a schematic structural diagram of the pump shaft of the specific implementation mode 1 of a new liquid return system for a gear pump.

[0023] Figure 8 It is an exploded view of the specific implementation mode 2 of a new liquid return system for a gear pump.

[0024] Figure 9 It is a schematic structural diagram of the pump shaft of the specific implementation mode 2 of a new liquid return system for a gear pump.

[0025] Description of main component symbols

[0026] Upper cover plate 1 Bushing hole 2 Liquid inlet 3 Liquid outlet 4 Auxiliary pipeline 5 Connection channel 6 Upper end cover 7 Intermediate plate 8 Cavity 9 Liquid suction port 10 Liquid discharge port 11 Base 12 Storage tank 13 Base return liquid pipeline 14 Triangular fixing part 15 Motor rotor 16 Pump shaft 17 Shaft rod 18 Gear 19 Winding skeleton 20 Motor stator 21 First central pipeline 22 Washer 23

[0027] The following specific implementation modes will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific implementation modes

[0028] The following embodiments are described to assist in the understanding of the present application, and the embodiments are not and should not be construed in any way as limiting the scope of protection of the present application.

[0029] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as separate functional units (which may include sub-units), but those skilled in the art will recognize that various components or portions thereof may be divided into separate components or may be integrated together (including being integrated within a single system or component).

[0030] Meanwhile, the connections between components or systems within the accompanying drawings are not intended to be limited to direct connections. Instead, the data between these components can be modified, reformatted, or otherwise altered by intermediate components. Additionally, additional or fewer connections may be used. It should also be noted that the terms "coupled," "connected," or "input" "fixed" should be understood to include both direct connections and indirect connections or fixings through one or more intermediate media.

[0031] In the description of this application, it should be noted that the orientation or positional relationships indicated by the terms "center," "upper," "lower," "left," "right," "side," "vertical," "horizontal," "inner," "outer," etc. are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships during the use of the product of this application or common perception. These are only for the convenience of describing this application 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. Therefore, it should not be construed as a limitation to this application. In addition, the terms "first," "second," "third," etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance. Furthermore, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly inclined. Detailed Embodiment 1

[0033] As Figure 1 shown, it is a schematic structural diagram of a new type of gear pump liquid return system; as Figure 2 shown, it is a bottom view structural diagram of the upper cover plate of a new type of gear pump liquid return system; as Figure 3 shown, it is a structural diagram of the intermediate plate of a new type of gear pump liquid return system; as Figure 4 shown, it is a structural diagram of the base of a new type of gear pump liquid return system; as Figure 5 shown, it is a schematic diagram of the local connection structure of a new type of gear pump liquid return system; as Figure 6 shown, it is an exploded view of Detailed Embodiment 1 of a new type of gear pump liquid return system; as Figure 7 shown, it is a schematic diagram of the pump shaft structure of Detailed Embodiment 1 of a new type of gear pump liquid return system.

[0034] A new type of gear pump liquid return system, comprising: an upper cover plate 1, an intermediate plate 8, a base 12 and a motor rotor 16. The upper cover plate 1, the intermediate plate 8, the base 12 and the motor rotor 16 are connected in sequence. Two bushing holes 2 are provided at the lower part of the upper cover plate 1. A liquid inlet 3 and a liquid outlet 4 are provided on the side wall of the upper cover plate 1. A cavity 9 is provided in the middle of the intermediate plate 8. A liquid suction port 10 and a liquid discharge port 11 are provided on both sides of the cavity 9. The liquid inlet 3 is connected to the liquid suction port 10 through a liquid inlet pipeline. The liquid outlet 4 is connected to the liquid discharge port 11 through a liquid discharge pipeline. A storage tank 13 is provided in the base 12. Two pump shafts 17 are provided in the middle of the cavity 9. The pump shaft 17 includes a shaft rod 18 and a gear 19 fixed on the shaft rod 18. The two gears 19 are meshed. The upper end of the shaft rod 18 is placed in its corresponding bushing. The lower end of the shaft rod 18 is placed in the storage tank 13. The lower end of one of the shaft rods 18 is connected to the motor rotor 16 shaft of the motor rotor 16. It is characterized in that: a connection channel 6 is provided at the upper end of any bushing, and a corresponding connection channel 6 is provided on the other bushing. The other end of the connection channel 6 is connected with an auxiliary pipeline 5. The auxiliary pipeline 5 communicates with the liquid inlet pipeline and the liquid suction port 10. One end of each connection channel 6 is connected to the upper end of the bushing, and the other end is connected to the auxiliary pipeline 5, so that the bushing, the liquid inlet pipeline, the auxiliary pipeline 5, the connection channel 6 and the liquid suction port 10 of the cavity 9 form a circulation channel. The auxiliary pipeline 5 is arranged parallel to the bushing at intervals.

[0035] An upper end cover 7 is provided at the top of the upper cover plate 1. The upper end cover 7 is fixedly connected to the top of the upper cover plate 1, so that the auxiliary pipeline 5, the connection channel 6 and the upper end of the bushing are sealed to form a semi-sealed structure.

[0036] The auxiliary pipeline 5 is in a groove shape or a round tube shape, and preferably in a round tube shape. The connection channel 6 is in a groove shape or a round tube shape, and preferably in a groove shape.

[0037] A base liquid return pipeline 14 is further provided on the base 12. One end of the base liquid return pipeline 14 is connected to the storage tank 13, and the other end of the base liquid return pipeline 14 is connected to the cavity 9, so that the liquid remaining in the storage tank 13 is circulated to the cavity 9 through the base liquid return pipeline 14 for recycling.

[0038] A triangular fixing piece 15 is provided at the outer edge of the base 12. The gear pump is fixed on the motor stator 21 through the triangular fixing piece 15.

[0039] A winding skeleton 20 is provided outside the motor rotor 16. The winding skeleton 20 is fixed on the inner wall of the motor stator 21.

[0040] A washer 23 or a gasket is provided on the outer periphery of the motor stator 21 close to the triangular fixing piece 15, so that the motor stator 21 and the triangular fixing piece 15 are fixed more firmly. Specific embodiment 2

[0042] As Figure 1 shown, it is a schematic structural diagram of a new type of gear pump liquid return system; as Figure 2 shown, it is a bottom view structural schematic diagram of the upper cover plate of the new type of gear pump liquid return system; as Figure 3 shown, it is a structural schematic diagram of the intermediate plate of the new type of gear pump liquid return system; as Figure 4 shown, it is a structural schematic diagram of the base of the new type of gear pump liquid return system; as Figure 5 shown, it is a schematic diagram of the local connection structure of the new type of gear pump liquid return system; as Figure 8 shown, it is an exploded view of the specific implementation method 2 of the new type of gear pump liquid return system; as Figure 9 shown, it is a schematic diagram of the pump shaft structure of the specific implementation method 2 of the new type of gear pump liquid return system.

[0043] A new type of gear pump liquid return system, comprising: an upper cover plate 1, an intermediate plate 8, a base 12 and a motor rotor 16, the upper cover plate 1, the intermediate plate 8, the base 12 and the motor rotor 16 are connected in sequence. Two bushing holes 2 are provided at the lower part of the upper cover plate 1, a liquid inlet 3 and a liquid outlet 4 are provided on the side wall of the upper cover plate 1. A cavity 9 is provided in the middle of the intermediate plate 8, a liquid suction port 10 and a liquid discharge port 11 are provided on both sides of the cavity 9. The liquid inlet 3 is connected to the liquid suction port 10 through a liquid inlet pipeline, and the liquid outlet 4 is connected to the liquid discharge port 11 through a liquid discharge pipeline. A storage tank 13 is provided in the base 12, two pump shafts 17 are provided in the middle of the cavity 9. The pump shaft 17 includes a shaft rod 18 and a gear 19 fixed on the shaft rod 18. The two gears 19 are meshed. The upper end of the shaft rod 18 is placed in its corresponding bushing, and the lower end of the shaft rod 18 is placed in the storage tank 13. The lower end of one of the shaft rods 18 is connected to the motor rotor 16 shaft of the motor rotor 16. It is characterized in that: a connection channel 6 is provided at the upper end of any bushing, and a first central pipeline 22 is provided in the middle of the shaft rod 18 in the other bushing, so that the first central pipeline 22, the bushing and the storage tank 13 form a circulation channel.

[0044] An upper end cover 7 is provided at the top of the upper cover plate 1, and the upper end cover 7 is fixedly connected to the top of the upper cover plate 1, so that the auxiliary pipeline 5, the connection channel 6 and the upper end of the bushing are sealed to form a semi-sealed structure.

[0045] The auxiliary pipeline 5 is in a groove shape or a circular tube shape, and preferably a circular tube shape. The connection channel 6 is in a groove shape or a circular tube shape, and preferably a groove shape.

[0046] A base liquid return pipeline 14 is further provided on the base 12. One end of the base liquid return pipeline 14 is connected to the storage tank 13, and the other end of the base liquid return pipeline 14 is connected to the cavity 9, so that the liquid remaining in the storage tank 13 is circulated to the cavity 9 through the base liquid return pipeline 14 for recycling.

[0047] The outer edge of the base 12 is provided with a triangular fixing member 15, and the gear pump is fixed on the motor stator 21 through the triangular fixing member 15.

[0048] A winding skeleton 20 is provided around the motor rotor 16, and the winding skeleton 20 is fixed on the inner wall of the motor stator 21.

[0049] A washer 23 or a gasket is provided on the periphery of the motor stator 21 close to the triangular fixing member 15, so that the fixation between the motor stator 21 and the triangular fixing member 15 is more stable.

[0050] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A new type of liquid return system for a gear pump, comprising: Upper cover plate (1), intermediate plate (8), base (12) and motor rotor (16), the upper cover plate (1), intermediate plate (8), base (12) and motor rotor (16) are connected in sequence. Two bushing holes (2) are provided at the lower part of the upper cover plate (1). A liquid inlet (3) and a liquid outlet (4) are provided on the side wall of the upper cover plate (1). A cavity (9) is provided in the middle of the intermediate plate (8). A liquid suction port (10) and a liquid discharge port (11) are provided on both sides of the cavity (9). The liquid inlet (3) is connected to the liquid suction port (10) through a liquid inlet pipeline. The liquid outlet (4) is connected to the liquid discharge port (11) through a liquid discharge pipeline. A storage tank (13) is provided in the base (12). Two pump shafts (17) are provided in the middle of the cavity (9). The pump shaft (17) includes a shaft rod (18) and a gear (19) fixed on the shaft rod (18). The two gears (19) are meshed. The upper end of the shaft rod (18) is placed in its corresponding bushing hole (2). The lower end of the shaft rod (18) is placed in the storage tank (13). The lower end of one of the shaft rods (18) is connected to the motor rotor (16) shaft of the motor rotor (16). It is characterized in that: a connection channel (6) is provided at the upper end of one of the bushing holes (2). A corresponding connection channel (6) is provided in the other bushing hole (2). The other ends of each connection channel (6) are commonly connected to an auxiliary pipeline (5). The auxiliary pipeline (5) communicates with the liquid inlet pipeline and the liquid suction port (10), so that the bushing hole (2), connection channel (6), auxiliary pipeline (5), liquid inlet pipeline and the liquid suction port (10) of the cavity (9) form a circulation channel. A base return liquid pipeline (14) is further provided on the base (12). One end of the base return liquid pipeline (14) is connected to the storage tank (13). The other end of the base return liquid pipeline (14) is connected to the cavity (9), and the liquid remaining in the storage tank (13) is circulated to the cavity (9) through the base return liquid pipeline (14) for recycling.

2. The novel gear pump liquid return system according to claim 1, wherein: The auxiliary pipeline (5) is arranged at intervals and in parallel with the bushing hole (2).

3. The novel gear pump liquid return system according to claim 2, characterized in that: An upper end cover (7) is provided at the top of the upper cover plate (1). The upper end cover (7) is fixedly connected to the top of the upper cover plate (1), so that the upper ends of the auxiliary pipeline (5), connection channel (6) and bushing hole (2) are sealed.

4. The novel gear pump liquid return system according to claim 3, wherein: The auxiliary pipeline (5) is in a groove shape or a circular tube shape. The connection channel (6) is in a groove shape or a circular tube shape.

5. The novel gear pump liquid return system according to claim 1, characterized in that: A triangular fixing member (15) is provided at the outer edge of the base (12). The gear pump is fixed on the motor stator (21) through the triangular fixing member (15). A winding skeleton (20) is provided outside the motor rotor (16). The winding skeleton (20) is fixed on the inner wall of the motor stator (21). A washer (23) or a gasket is provided on the outer periphery of the motor stator (21) near the triangular fixing member (15).

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