A low-noise direct-insertion plunger pump motor and production method thereof

Abstract

The present invention discloses a low-noise plug-in plunger pump motor and a production method thereof. It comprises: a motor body, wherein the motor body is equipped with an output shaft, the end of the output shaft is provided with a plug-in hole for inserting the plunger pump input shaft, and the inner wall of the plug-in hole is provided with at least one keyway; a front end cover, which is fixed on the motor body, and comprises an end cover body, a rib plate and a hollow flange, a through hole corresponding to the output shaft is formed on the end cover body, the end face of the output shaft is flush with the end face of the through hole, a web is provided on the inner side of the end cover body, and the hollow flange is fixedly connected to the end cover body through the rib plate, so that the plug-in hole of the output shaft, the plunger pump input shaft and the center of the hollow flange are in the same straight line. The concentricity of the installation of the output shaft of the motor and the input shaft of the plunger pump is ensured to be consistent, and the running noise of the motor is reduced. At the same time, the heat dissipation efficiency of the motor is high, and the normal operation of the motor is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of motor production, and more specifically, relates to a low-noise direct-insertion plunger pump motor and a production method thereof. Background Art

[0002] The plunger pump is a basic structural form of hydraulic pump. It is widely used in hydraulic systems due to its simple structure, reliable sealing and high working pressure. At present, as an independent hydraulic power element, the plunger pump generally needs to be connected with a rotating motor (or internal combustion engine) to form a motor-hydraulic pump unit to output hydraulic energy. The current plunger pump motor is an external shaft type, and one end of the motor output shaft extends out of the motor housing, and then is connected to the plunger pump input shaft through a coupling and a plunger pump motor seat. Due to the existence of the coupling and the plunger pump motor seat, the required installation space is large and the production cost is high. In addition, during assembly, the motor output shaft and the plunger pump input shaft must be coaxial, which requires professional personnel to install and debug. The installation process is relatively complicated. In addition, during use, the motor or oil pump often swings or shifts, and the coaxiality of the output shaft and the plunger pump input shaft cannot be ensured. Once the operation is unstable, the noise is high, and the heat generation occurs.

[0003] In order to solve the above problems, after searching, for example, the patent document of Chinese patent application No. 200820034270.4, published on February 18, 2009, discloses a matching oil pump motor that can be directly connected, including a motor body, a front end cover and an output shaft, the front end cover is fixed on the motor body, the output shaft end is hollow, the hollow aperture matches the outer diameter of the oil pump input shaft, the output shaft end has a keyway, the front end cover is provided with a flange that matches the oil pump and can be connected, the middle of the front end cover is the running space of the oil pump input shaft, and the output shaft is retracted into the front end cover. The oil pump motor has a simple structure, the output end of the motor can be directly connected to the oil pump input shaft, because the motor will generate a certain amount of heat during operation, this heat needs to be discharged in time to avoid the motor from overheating and burning, but the structure of the motor is not conducive to the heat dissipation, and further improvement is needed.

[0004] Another example is the Chinese patent application No. 200820201825.X, published on August 19, 2009, which discloses a motor for oil pumps, including a motor housing, a rear end cover and a front end cover respectively installed at both ends of the motor housing, and a rotor installed in the motor housing, the rotor is connected to the motor output shaft, the front end cover is provided with a motor shaft hole through which the power supply motor output shaft passes, and the outer side of the front end cover extends into a flange for fixing the oil pump. Similarly, the heat dissipation performance of the motor is also poor, which easily causes the motor to overheat and affects the normal use of the motor.

[0005] Another example is Chinese patent application No. 201610549163.4, which was published on November 9, 2016. It discloses a plunger pump mechanism for producing chemical fibers, which is mainly composed of a motor, a base, a coupling, a bearing group, a plunger pump, a gear box, a handle, a feed port and a discharge port. The motor is vertically arranged above the base, and the output end of the motor is connected to the coupling in the base. The lower end of the coupling is correspondingly provided with a bearing group, and the lower end of the base is connected to the plunger pump. The two ends of the plunger pump are respectively provided with a feed port and a discharge port. The lower end of the plunger pump is fixedly connected to the gear box, and the handle is arranged on the side wall of the gear box. The plunger pump structure is connected by a coupling, which is a soft connection. Due to the inconsistent concentricity, the noise is relatively large. The technicians in this field are familiar with this situation, so it needs to be improved. Summary of the invention

[0006] 1. Problem to be solved

[0007] In view of the problems that the output shaft of the existing motor and the input shaft of the plunger pump are not installed with high concentricity, resulting in unstable operation, high noise, heat generation and other problems, the purpose of the present invention is to provide a low-noise direct-insertion plunger pump motor to ensure that the output shaft of the motor and the input shaft of the plunger pump are installed with consistent concentricity, reduce the operating noise of the motor, and at the same time, the heat dissipation efficiency of the motor is high to ensure the normal operation of the motor.

[0008] Another object of the present invention is to provide a method for producing a low-noise direct-insert plunger pump motor. By improving the processing requirements for the front end cover of the motor, the installation concentricity of the output shaft and the input shaft of the motor is kept highly consistent, which can effectively reduce the operating noise.

[0009] 2. Technical solution

[0010] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0011] The low-noise direct-insertion plunger pump motor of the present invention comprises: a motor body, wherein the motor body has an output shaft built therein, a plug-in hole for inserting the plunger pump input shaft is provided at the end of the output shaft, and at least one key groove is provided on the inner wall of the plug-in hole;

[0012] The front end cover is fixed on the motor body, and includes an end cover body, a rib plate and a hollow flange. A through hole corresponding to the output shaft is formed on the end cover body, and the end face of the output shaft is flush with the end face of the through hole. A web is provided on the inner side of the end cover body, and the hollow flange is fixedly connected to the end cover body through the rib plate, so that the plug hole of the output shaft, the input shaft of the plunger pump and the center of the hollow flange are on the same straight line.

[0013] In one embodiment of the present invention, the cross-sectional shape of the plug hole is circular, polygonal or elliptical.

[0014] In one embodiment of the present invention, the length of the plug hole is 1 / 2-3 / 4 of the extended length of the output shaft.

[0015] In one embodiment of the present invention, the length of the keyway is consistent with the length of the plug hole.

[0016] In one embodiment of the present invention, there are multiple webs, and the multiple webs are radially arranged around the through hole.

[0017] In one embodiment of the present invention, the width of the web gradually widens from a direction close to the through hole to a direction away from the through hole.

[0018] In one embodiment of the present invention, there are multiple ribs, and the multiple ribs are radially arranged around the through hole of the end cover body.

[0019] In one embodiment of the present invention, the outer edge of the end cover body is an arc surface, and the top surface of the rib plate is tangent to the arc surface.

[0020] The present invention also provides a method for producing a low-noise direct-insert plunger pump motor, comprising the following steps: after assembling the front end cover and the motor body, fixing the output shaft of the motor using a pair of ejectors with consistent concentricity, and then fine-machining the flange end face so that the output shaft's plug-in hole and the central axis of the plunger pump input shaft are perpendicular to the hollow flange end face.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The low-noise direct-insertion plunger pump motor of the present invention can be directly fixed on the flange of the motor. After installation, the motor output shaft and the plunger pump input shaft are naturally aligned with high concentricity, and the assembly is simple and convenient. No professional personnel are required for installation and debugging. After installation, the motor and the plunger pump are connected as one, and no swing or displacement will occur. The operation is stable, the noise is low, and the heat generation is low. A plug-in hole for inserting the plunger pump input shaft is provided at the end of the motor output shaft, and a keyway is provided on the inner wall of the plug-in hole. Correspondingly, a positioning protrusion that can be embedded in the keyway is provided on the plunger pump input shaft, so that the motor output shaft and the plunger pump input shaft rotate synchronously, forming an inner shaft structure, so as to reduce the space required for installation, and at the same time save the coupling and the oil pump motor seat, saving costs, and having strong competitiveness in terms of cost performance;

[0024] (2) The cross-sectional shape of the plug-in hole of the low-noise direct-insertion plunger pump motor of the present invention is circular, polygonal or elliptical, so it can meet the use requirements of most plunger pumps on the market. At the same time, the preferred cross-sectional shape is circular, which is convenient for controlling concentricity;

[0025] (3) In the low-noise direct-insertion plunger pump motor of the present invention, the length of the plug hole is 1 / 2-3 / 4 of the extended length of the output shaft. The general design requirement is that the extended length of the output shaft cannot be too long, because the end of the output shaft will be affected by vibration and shake, thereby affecting the concentricity of the output shaft and the input shaft. Therefore, the length of the plug hole will also be limited accordingly;

[0026] (4) The low-noise direct-insertion plunger pump motor of the present invention is provided with a web on the inner side of the end cover body, and the number of webs is multiple, and the multiple webs are arranged radially around the through hole, which can play a role in heat dissipation at both ends of the motor;

[0027] (5) In the low-noise direct-insertion plunger pump motor of the present invention, the width of the web gradually widens from the direction close to the through hole to the direction away from the through hole. These webs can not only enhance the strength of the front end cover, but also the width change of the webs can absorb more heat in the air, discharge the heat inside the front end cover in time, and ensure the normal use of the motor;

[0028] (6) The low-noise direct-insertion plunger pump motor of the present invention has a radially radial arrangement of the ribs around the through hole of the end cover body. A large gap is formed between the ribs and the hollow flange, which can accelerate the convection of hot air and cold air and timely dissipate the heat generated by the friction between the output shaft and the input shaft;

[0029] (7) The production method of the low-noise direct-insertion plunger pump motor of the present invention has orderly connected steps. By adjusting the process, the precision of fine processing can be further improved, the concentricity of the output shaft, flange and input shaft can be improved, and the running noise of the motor can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0031] Figure 1 It is a structural schematic diagram of the low-noise direct-insertion plunger pump motor of the present invention;

[0032] Figure 2 It is a structural schematic diagram of the front end cover of the present invention;

[0033] Figure 3 for Figure 2 Rear view of.

[0034] Description of the markings in the figure:

[0035] 100, motor body; 110, output shaft; 120, plug hole; 130, keyway;

[0036] 200, front end cover; 210, end cover body; 211, through hole; 212, web; 213, arc surface; 220, rib plate; 221, top surface; 230, hollow flange. DETAILED DESCRIPTION

[0037] The following detailed description of exemplary embodiments of the present invention refers to the accompanying drawings, which form a part of the description, and in which exemplary embodiments of the present invention that can be implemented are shown as examples. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to implement the present invention, it should be understood that other embodiments can be implemented and various changes can be made to the present invention without departing from the spirit and scope of the present invention. The following more detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but is only for the purpose of illustrating and not limiting the description of the characteristics and features of the present invention, so as to propose the best mode for performing the present invention and to enable those skilled in the art to implement the present invention. Therefore, the scope of the present invention is limited only by the appended claims.

[0038] The following detailed description of the present invention and example embodiments may be better understood in conjunction with the accompanying drawings, in which elements and features of the present invention are identified by reference numerals.

[0039] Example 1

[0040] Please refer to Figures 1 to 3 A low-noise direct-insertion plunger pump motor of this embodiment includes: a motor body 100, the motor body 100 has an output shaft 110 built therein, the end of the output shaft 110 is provided with a plug hole 120 for inserting the plunger pump input shaft, the inner wall of the plug hole 120 is provided with at least one key groove 130, and the number of the key groove 130 of this embodiment is 1;

[0041] The front end cover 200 is fixed on the motor body 100, and includes an end cover body 210, a rib plate 220 and a hollow flange 230. A through hole 211 corresponding to the output shaft 110 is formed on the end cover body 210, and the end face of the output shaft 110 is flush with the end face of the through hole 211. A web 212 is provided on the inner side of the end cover body 210. The hollow flange 230 is fixedly connected to the end cover body 210 through the rib plate 220, so that the centers of the plug hole 120 of the output shaft 110, the plunger pump input shaft and the hollow flange 230 are on the same straight line.

[0042] By improving the structure of the front cover 200 and the output shaft 110, the plunger pump input shaft is easier to install and can be directly plugged in. After installation, the motor output shaft 110 and the plunger pump input shaft are naturally aligned and can still maintain concentricity consistency.

[0043] like Figure 2 As shown, in the current market, there are many cross-sectional shapes of the plunger pump input shaft. Several commonly used ones are given in this embodiment. For example, the cross-sectional shape of the plug hole 120 is circular, polygonal or elliptical. The preferred cross-sectional shape of the plug hole 120 is circular, which is convenient for processing and concentricity positioning.

[0044] Furthermore, the length of the plug hole 120 is 1 / 2-3 / 4 of the extended length of the output shaft 110. The general design requirement is that the extended length of the output shaft 110 cannot be too long, because the end of the output shaft 110 will be affected by vibration and shake, thereby affecting the concentricity of the output shaft 110 and the input shaft. Therefore, the length of the plug hole 120 will also be limited accordingly. In this embodiment, the length of the plug hole 120 cannot be too short, because the plug hole 120 and the output shaft 110 are key-connected. Under the condition of ensuring a certain connection strength, it is also necessary to ensure that the output power meets the use requirements of the plunger pump. Preferably, the length of the plug hole 120 is 1 / 2 of the length of the output shaft 110.

[0045] In addition, there are also requirements for the design of the plug hole 120 , and the length of the key slot 130 is consistent with the length of the plug hole 120 .

[0046] During the long-term operation of the motor, the motor can convert electrical energy into heat energy, and this heat will accumulate inside the motor housing. Once the motor overheats, it will burn out. Therefore, the motor needs to be cooled. At present, the motor housing is provided with spokes to play a role in heat dissipation, but the spokes are generally arranged in the middle of the motor housing, and basically do not play a role in heat dissipation at both ends of the motor. Therefore, Figure 3 As shown, a web 212 is disposed on the inner side of the end cover body 210 . There are multiple webs 212 , and the multiple webs 212 are radially arranged around the through hole 211 .

[0047] Furthermore, the width of the web 212 gradually widens from close to the through hole 211 to away from the through hole 211. These webs 212 can not only enhance the strength of the front cover 200, but the change in the width of the web 212 can absorb more heat in the air and discharge the heat inside the front cover 200 in time to ensure the normal use of the motor.

[0048] In addition, if Figure 2 As shown, there are multiple rib plates 220, specifically four rib plates 220, which are evenly distributed around the circumference of the through hole 211, and are radially arranged along the through hole 211 of the end cover body 210. A large gap is formed between the rib plates 220 and the hollow flange 230, which can accelerate the convection of hot air and cold air, and can timely dissipate the heat generated by the friction between the output shaft 110 and the input shaft.

[0049] In addition to the above-mentioned belly plate 212 for heat dissipation, the outer edge of the end cover body 210 is a circular arc surface 213, and the top surface 221 of the rib plate 220 is tangent to the circular arc surface 213. Since the structure of the front end cover 200 in this embodiment is changed, the natural frequency of the front end cover 200 is improved, so that the running speed of the equipment (plunger pump motor) using the end cover can avoid the resonance point, effectively reducing the noise decibel value and vibration value, greatly improving customer experience, reducing the safety hazards of loose fasteners caused by vibration, etc., and having the characteristics of simple structure and low cost.

[0050] Example 2

[0051] A production method for a low-noise direct-insertion plunger pump motor in this embodiment includes the following steps: after assembling the front end cover 200 and the motor body 100, the output shaft 110 of the motor is fixed by a pair of concentric pins, and then the flange end face is fine-machined so that the plug-in hole 120 of the output shaft 110 and the central axis of the plunger pump input shaft are perpendicular to the end face of the hollow flange 230.

[0052] The specific steps are as follows: the motor housing and front end cover 200 are both formed by one-time casting, a plug hole 120 and a keyway 130 are opened along the center of the connecting end of the rotor, the rotor is placed in the motor housing, one end of the output shaft 110 extends through the housing, and the other end is placed in the through hole 211, the end face of the output shaft 110 is flush with the end face of the through hole 211, the front end cover 200 is assembled with the motor body 100, and fastened by bolts, and a pair of coaxial ejectors are installed on a lathe. The ejectors are pointed in shape and have a coaxiality of 100%. The two ends of the output shaft 110 of the motor are fixed by the ejectors, and then the end face of the hollow flange 230 is finely processed so that the plug hole 120 of the output shaft 110 and the central axis of the plunger pump input shaft are perpendicular to the end face of the hollow flange 230.

[0053] Among them, the process parameters for finishing the end face of the hollow flange 230 are as follows:

[0054] 1) The rotation speed V of the hollow flange 230 = 10*the thickness h of the hollow flange 230 + the height H of the rib plate 220, in units of r / min;

[0055] 2) The cutting feed amount L = the thickness of the hollow flange 230 h / V, unit: mm / min.

[0056] The motor housing and front cover 200 are both cast iron. For example, the thickness h of the hollow flange 230 of the plunger pump motor is 10 mm, and the height H of the rib plate 220 is 400 mm. The rotation speed V of the hollow flange 230 is 500 r / min, and the cutting feed amount L is 0.02 mm.

[0057] The above-mentioned fine machining parameter design can effectively improve the flatness of the hollow flange end face, thereby further improving the concentricity of the output shaft 110, the hollow flange and the input shaft, reducing the noise during the use of the motor, and complying with the current environmentally friendly production.

[0058] The production method of this embodiment is used to produce and process multiple batches of plunger pump motors, for example, 1,000 plunger pump motors are produced at a time, and the concentricity of the motor is tested, where the concentricity error value is ±0.02mm, the number of qualified products is 998, the number of unqualified products is 2, and the pass rate is close to 100%.

[0059] For example, we conducted a random inspection on the supply provided to a certain enterprise, with a total of 893 low-noise direct-insert plunger pump motors. The concentricity of the motors was tested and 889 were qualified and 4 were unqualified, with a pass rate of nearly 100%.

[0060] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A low-noise direct-insertion plunger pump motor, characterized in that: include: A motor body (100), wherein the motor body (100) has an output shaft (110) built therein, a plug hole (120) for inserting a plunger pump input shaft is provided at the end of the output shaft (110), and at least one key groove (130) is provided on the inner wall of the plug hole (120); the cross-sectional shape of the plug hole (120) is circular, polygonal or elliptical; A front end cover (200) is fixed on the motor body (100), comprising an end cover body (210), a rib plate (220) and a hollow flange (230); a through hole (211) corresponding to the output shaft (110) is formed on the end cover body (210); the end surface of the output shaft (110) is flush with the end surface of the through hole (211); a web (212) is provided on the inner side of the end cover body (210); and the hollow flange (230) is fixedly connected to the end cover body (210) via the rib plate (220), so that the centers of the plug hole (120) of the output shaft (110), the plunger pump input shaft and the hollow flange (230) are on the same straight line; There are a plurality of webs (212), and the plurality of webs (212) are radially arranged around the through hole (211); The width of the web (212) gradually widens in a direction from close to the through hole (211) to away from the through hole (211).

2. The low-noise direct-insertion plunger pump motor according to claim 1, characterized in that: The length of the plug hole (120) is 1 / 2-3 / 4 of the extended length of the output shaft (110).

3. The low-noise direct-insertion plunger pump motor according to claim 1 or 2, characterized in that: The length of the key slot (130) is consistent with the length of the plug hole (120).

4. The low-noise direct-insertion plunger pump motor according to claim 1 or 2, characterized in that: There are a plurality of rib plates (220), and the plurality of rib plates (220) are radially arranged around the through hole (211) of the end cover body (210).

5. The low-noise direct-insertion plunger pump motor according to claim 4, characterized in that: The outer edge of the end cover body (210) is a circular arc surface (213), and the top surface (221) of the rib plate (220) is tangent to the circular arc surface (213).

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