Connecting structure of gear pump and motor

Abstract

The utility model provides a connecting structure of a gear pump and a motor, which comprises the following components: a gear pump which is provided with a gear pump shaft; a motor; a blind hole is formed in the shaft end face of one end of the transmission shaft, the other end of the transmission shaft is used for being connected with a motor, the blind hole is used for containing a gear pump shaft, an open groove is formed in the end portion of the end, provided with the blind hole, of the transmission shaft, penetrates through the end portion of the transmission shaft and divides the end portion of the transmission shaft into at least two subsections in the axial direction, and the open groove penetrates through the blind hole. The depth of the open slot is greater than that of the blind hole in the axial direction of the transmission shaft; the adjacent branch parts are mutually locked through the locking components, so that the gear pump shaft is clamped in the blind hole. The gear pump shaft and the transmission shaft are tightly and reliably connected and are not easy to loosen, so that the possibility of relative rotation of the gear pump shaft and the transmission shaft can be greatly reduced, the gear pump shaft can be effectively prevented from being damaged, the equipment maintenance cost can be effectively reduced, and the requirement on the machining precision of the transmission shaft can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of viscosity measurement equipment technology, and in particular to a connection structure between a gear pump and a motor. Background Technology

[0002] A gear pump is a rotary pump that transports or pressurizes liquids by relying on the change and movement of the working volume formed between the pump cylinder and meshing gears. The working principle of a gear pump is as follows: two gears, a pump body, and front and rear covers form two closed spaces. When the gears rotate, the volume of the space on the disengaged side of the gears increases from small to large, creating a vacuum that draws in the liquid. Conversely, the volume of the space on the meshing side of the gears decreases from large to small, forcing the liquid into the pipeline.

[0003] Gear pumps are often used in viscosity measurements, for example, to deliver the fluid to be measured to a capillary viscometer. (See reference...) Figures 1 to 3 , Figure 1 This is a schematic diagram of the connection between the existing gear pump 3 and the motor 2. The gear pump shaft needs to be connected to the motor 2 through the drive shaft 1. The existing drive shaft 1 usually has a hexagonal blind hole 11 drilled on the end face of the shaft. The hexagonal blind hole 11 matches the shape of the gear pump shaft. The gear pump shaft is inserted into the hexagonal blind hole 11, and a set screw is used to pass through the side wall of the hexagonal blind hole and press against the gear pump shaft in the hexagonal blind hole, thereby achieving the purpose of fastening the gear pump shaft to the drive shaft 1. The side wall of the hexagonal blind hole is provided with a first threaded hole 12 that mates with the set screw. However, this connection method is not reliable enough, and the hexagonal blind hole 11 in this connection method has high requirements for machining accuracy. If the size of the hexagonal blind hole 11 is too small, the gear pump shaft cannot be installed. If the size of the hexagonal blind hole 11 is too large, the connection between the gear pump shaft and the drive shaft 1 will not be tight enough, and the gear pump shaft and the drive shaft 1 will easily rotate relative to each other. During the operation of the viscometer, once relative rotation occurs, on the one hand, the set screw is easy to scratch the surface of the gear pump shaft. On the other hand, friction and pushing occur between the gear pump shaft and the hexagonal blind hole. Both the gear pump shaft and the hexagonal blind hole are easily worn or even damaged, increasing the equipment maintenance cost. Utility Model Content

[0004] The purpose of this utility model is to provide a connection structure between a gear pump and a motor, in which the gear pump shaft and the drive shaft are tightly and reliably connected and not easily loosened, which can greatly reduce the possibility of relative rotation between the gear pump shaft and the drive shaft, effectively prevent damage to the gear pump shaft, effectively reduce equipment maintenance costs, and reduce the machining accuracy requirements of the drive shaft, resulting in high reliability.

[0005] To achieve the above objectives, this utility model provides a connection structure between a gear pump and a motor, comprising:

[0006] A gear pump, the gear pump having a gear pump shaft;

[0007] Electric motor;

[0008] A drive shaft has a blind hole on one end face and is used to connect the motor at the other end. The blind hole is used to accommodate the gear pump shaft. The end of the drive shaft with the blind hole has an opening groove that penetrates the end of the drive shaft and divides the end of the drive shaft into at least two parts along the axial direction. The opening groove also penetrates the blind hole. The depth of the opening groove is greater than the depth of the blind hole along the axial direction of the drive shaft.

[0009] At least two locking members are provided, and adjacent portions are locked together by the locking members to clamp the gear pump shaft in the blind hole.

[0010] Optionally, the blind hole is a polygonal blind hole.

[0011] Optionally, the locking member includes a screw, the shank of which passes through one of the portions and is threaded to the other portion, thereby connecting two adjacent portions.

[0012] Optionally, the outer circumferential surface of the drive shaft is provided with a countersunk groove for mounting the head of the screw.

[0013] Optionally, the opening groove evenly divides the end of the drive shaft into two sections.

[0014] Optionally, the shape of the blind hole matches the outer periphery of the gear pump shaft.

[0015] Optionally, the connection structure includes a coupling, the motor has a motor shaft, and the transmission shaft is connected to the motor shaft via the coupling.

[0016] Optionally, the blind hole is coaxially arranged with the drive shaft.

[0017] Optionally, the depth of the opening groove in the axial direction of the drive shaft is 1.8-2.2 times the depth of the blind hole.

[0018] Optionally, the drive shaft is made of metal.

[0019] As configured above, one end of the drive shaft is divided into at least two sections by an open slot. The depth of the open slot is greater than the depth of the blind hole in the axial direction of the drive shaft. The depth of the open slot is sufficient to allow all sections to undergo elastic deformation. The locking mechanism interlocks the sections while they elastically deform, thus encircling and clamping the gear pump shaft within the blind hole. Even if the blind hole is machined to a size that is too large or too small, the elastic deformation of the sections will still tightly clamp the gear pump shaft. In summary, the gear pump shaft and drive shaft of this invention are tightly and reliably connected and not easily loosened, greatly reducing the possibility of relative rotation between the gear pump shaft and drive shaft. This effectively prevents damage to the gear pump shaft, significantly reduces equipment maintenance costs, and lowers the machining accuracy requirements for the drive shaft, resulting in high reliability. Attached Figure Description

[0020] Those skilled in the art will understand that the accompanying drawings are provided to better understand the present invention and do not constitute any limitation on the scope of the present invention. Wherein:

[0021] Figure 1 A schematic diagram of the connection between a gear pump and a motor in the prior art;

[0022] Figure 2 This is a schematic diagram of a drive shaft in the prior art;

[0023] Figure 3 for Figure 2 CC-direction cross-section;

[0024] Figure 4 This is a schematic diagram showing the connection between the gear pump and the motor according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the drive shaft of the gear pump and motor connection structure according to an embodiment of the present invention;

[0026] Figure 6 for Figure 5 AA-direction cross section;

[0027] Figure 7 for Figure 5 BB-direction cross-section.

[0028] The reference numerals in the attached figures are as follows:

[0029] 1-Drive shaft; 11-Hexagonal blind hole; 12-First threaded hole; 13-Blind hole; 14-Open slot; 15-Divider; 16-Counterpart; 17-Through hole; 18-Second threaded hole; 2-Motor; 3-Gear pump; 4-Locking component; 5-Coupling. Detailed Implementation

[0030] In this document, unless otherwise stated, the terms “upper,” “lower,” “left,” “right,” “inner,” “outer,” “front,” “back,” “top,” “bottom,” etc., are used to indicate orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a characteristic orientation and operation, and therefore should not be construed as a limitation of the present invention.

[0031] The specific embodiments of this utility model will now be described in more detail with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0032] The preferred embodiments of this utility model are given below with reference to the accompanying drawings and described in detail.

[0033] Figure 4 This is a schematic diagram showing the connection between the gear pump and the motor according to an embodiment of this utility model. Please refer to it. Figure 4 This utility model embodiment provides a connection structure between a gear pump and a motor, which includes a gear pump 3, a motor 2, a transmission shaft 1 and at least two locking components 4, wherein the gear pump 3 has a gear pump shaft.

[0034] Please refer to Figure 5 , Figure 6 and Figure 7 A blind hole 13 is provided on the end face of one end of the drive shaft 1. The other end of the drive shaft 1 is used to connect the motor 22. The blind hole 13 is used to accommodate the gear pump shaft. It can be understood that the shape of the blind hole 13 matches the outer circumference of the gear pump shaft. Further, the blind hole 13 is a polygonal blind hole to better prevent relative rotation between the gear pump shaft and the drive shaft 1. For example, the blind hole 13 is a hexagonal blind hole. The end of the drive shaft 1 with the blind hole 13 is provided with an opening groove 14. The opening groove 14 penetrates the end of the drive shaft 1 and divides the end of the drive shaft 1 into at least two portions 15 along the axial direction. The opening groove 14 penetrates the blind hole 13. The depth of the opening groove 14 in the axial direction of the drive shaft 1 is greater than the depth of the blind hole 13. Further, the depth of the opening groove 14 in the axial direction of the drive shaft 1 is 1.8-2.2 times the depth of the blind hole 13. For example, the opening groove 14 evenly divides the end of the drive shaft 1 into two portions 15. The depth of the opening groove 14 along the axial direction of the drive shaft 1 is twice the depth of the blind hole 13; for example, the depth of the opening groove 14 is 40 mm, and the depth of the blind hole 13 is 20 mm. The blind hole 13 is coaxially arranged with the drive shaft 1. It can be understood that the opening groove 14 also evenly divides the blind hole 13 into two parts along the axial direction. The drive shaft 1 can be made of a metal material, such as stainless steel. In this way, each portion 15 becomes an elastic part, and adjacent portions 15 can be locked together by the locking member 4 to clamp the gear pump shaft in the blind hole 13.

[0035] For example, the locking member 4 includes a screw, which can be an internal hexagon head screw. The screw shank passes through one section 15 and is threaded to another section 15, thereby connecting the two adjacent sections 15. Further, the axis of the screw is perpendicular to the axis of the drive shaft 1, and the outer circumferential surface of the drive shaft 1 has a countersunk groove 16 for mounting the screw head. Taking the opening groove 14 uniformly dividing the end of the drive shaft 1 into two sections 15 as an example, each radial side of one section 15 is connected to the radial sides of the other section 15 by at least one screw. In this embodiment, each radial side of one section 15 is correspondingly connected to the radial sides of the other section 15 by two screws. It is understood that the section 15 where the screw head is located has a through hole 17 for the screw to pass through, and the section 15 where the screw tail (i.e., the end of the screw shank) is located has a second threaded hole 18 that mates with the screw. In this embodiment, the through hole is provided on one radial side of the section 15, and the second threaded hole 18 is provided on the other radial side of the section 15. This invention ensures both ease of installation and the strength of the drive shaft 1 required for the viscometer's operation. In other embodiments, bolts and nuts may be used instead of screws.

[0036] The connection structure between the gear pump 3 and the motor 22 includes a coupling 5. The motor 22 has a motor 22 shaft. The transmission shaft 1 is connected to the motor 22 shaft through the coupling 5, so that the motor 22 shaft can drive the transmission shaft 1 to rotate, and the transmission shaft 1 in turn drives the gear pump shaft to rotate.

[0037] In summary, this utility model provides a connection structure between a gear pump 3 and a motor 22, which includes a gear pump 3, a motor 22, a transmission shaft 1, and at least two locking members 4. The gear pump 3 has a gear pump shaft. A blind hole 13 is provided on the shaft end face of one end of the transmission shaft 1. The other end of the transmission shaft 1 is used to connect to the motor 22. The blind hole 13 is used to accommodate the gear pump shaft. An opening groove 14 is provided at the end of the transmission shaft 1 where the blind hole 13 is provided. The opening groove 14 penetrates the end of the transmission shaft 1 and divides the end of the transmission shaft 1 into at least two portions 15 along the axial direction. The opening groove 14 penetrates the blind hole 13. The depth of the opening groove 14 is greater than the depth of the blind hole 13 in the axial direction of the transmission shaft 1. Adjacent portions 15 are locked together by the locking members 4 to clamp the gear pump shaft in the blind hole 13.

[0038] As configured above, one end of the drive shaft 1 is divided into at least two portions 15 by an opening groove 14. The depth of the opening groove 14 along the axial direction of the drive shaft 1 is greater than the depth of the blind hole 13. The opening groove 14 is deep enough to allow all portions 15 to undergo elastic deformation. The locking member 4 locks each portion 15 together while the portions 15 undergo elastic deformation, thereby encircling and clamping the gear pump shaft in the blind hole 13. Even if the blind hole 13 is machined to a size that is too large or too small, the gear pump shaft can still be tightly clamped by the elastic deformation of the portions 15. The gear pump shaft and drive shaft 1 are tightly and reliably connected and not easily loosened, greatly reducing the possibility of relative rotation between the gear pump shaft and drive shaft 1. This effectively prevents damage to the gear pump shaft, effectively reduces equipment maintenance costs, and lowers the machining accuracy requirements of the drive shaft 1, resulting in high reliability.

[0039] It should be noted that references to "an embodiment," "an embodiment," "a specific embodiment," "some embodiments," etc., in the specification only indicate that the described embodiment may include a specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Additionally, when a specific feature, structure, or characteristic is described in conjunction with an embodiment, whether explicitly described or not, implementing such a feature, structure, or characteristic in conjunction with other embodiments is within the knowledge of those skilled in the art.

[0040] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.

[0041] It should also be noted that although the present invention has been disclosed above with reference to preferred embodiments, these embodiments are not intended to limit the present invention. For any person skilled in the art, many possible variations and modifications can be made to the present invention without departing from the scope of the present invention, or equivalent embodiments can be modified based on the disclosed technical content. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention shall still fall within the protection scope of the present invention.

[0042] It should also be understood that, unless otherwise specified or indicated, the terms “first,” “second,” “third,” etc., in the specification are used only to distinguish the various components, elements, and steps in the specification, and not to indicate the logical or sequential relationships between the various components, elements, and steps.

[0043] Furthermore, it should be recognized that the terminology described herein is used only to describe particular embodiments and not to limit the scope of the invention. It must be noted that the singular forms “a” and “an” used herein and in the appended claims include plural bases unless the context clearly indicates otherwise. For example, a reference to “a step” or “an apparatus” means a reference to one or more steps or apparatuses, and may include secondary steps and secondary apparatuses. All conjunctions used should be understood in the broadest sense. Also, the word “or” should be understood to have the definition of logical “or” rather than logical “exclusive OR”, unless the context clearly indicates otherwise. Furthermore, implementation of the methods and / or devices in embodiments of the invention may include performing selected tasks manually, automatically, or in combination.

Claims

1. A connection structure between a gear pump and a motor, characterized in that, include: A gear pump, the gear pump having a gear pump shaft; Electric motor; A drive shaft has a blind hole on one end face and is used to connect the motor at the other end. The blind hole is used to accommodate the gear pump shaft. The end of the drive shaft with the blind hole has an opening groove that penetrates the end of the drive shaft and divides the end of the drive shaft into at least two parts along the axial direction. The opening groove also penetrates the blind hole. The depth of the opening groove is greater than the depth of the blind hole along the axial direction of the drive shaft. At least two locking members are provided, and adjacent portions are locked together by the locking members to clamp the gear pump shaft in the blind hole.

2. The connection structure between the gear pump and the motor as described in claim 1, characterized in that, The blind hole is a polygonal blind hole.

3. The connection structure between the gear pump and the motor as described in claim 1, characterized in that, The locking member includes a screw, the shank of which passes through one of the portions and is threaded to the other portion, thereby connecting the two adjacent portions.

4. The connection structure between the gear pump and the motor as described in claim 3, characterized in that, The outer circumferential surface of the drive shaft is provided with a countersunk groove for mounting the head of the screw.

5. The connection structure between the gear pump and the motor as described in claim 1, characterized in that, The opening groove evenly divides the end of the drive shaft into two sections.

6. The connection structure between the gear pump and the motor as described in claim 1, characterized in that, The shape of the blind hole matches the outer periphery of the gear pump shaft.

7. The connection structure between the gear pump and the motor as described in claim 1, characterized in that, The connection structure includes a coupling, the motor has a motor shaft, and the transmission shaft is connected to the motor shaft via the coupling.

8. The connection structure between the gear pump and the motor as described in claim 1, characterized in that, The blind hole is coaxially arranged with the drive shaft.

9. The connection structure between the gear pump and the motor as described in claim 1, characterized in that, The depth of the opening groove along the axial direction of the drive shaft is 1.8-2.2 times the depth of the blind hole.

10. The connection structure between the gear pump and the motor as described in claim 1, characterized in that, The drive shaft is made of metal.

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