A driving mechanism for a plunger pump

Abstract

The present invention discloses a driving mechanism for a plunger pump, including a motor and a plunger pump assembly. The motor and the plunger pump assembly are connected by a mounting frame. The mounting frame is provided with a transmission component, which includes a transmission wheel, a reset wheel, and a rotating shaft. The transmission wheel is connected by a transmission with the motor shaft of the motor and is provided with a top-pressure cam surface. The end of the plunger rod in the plunger pump assembly rests on the top-pressure cam surface. The top-pressure cam surface is provided with a starting point O and a reset point P, respectively. The starting point O to the reset point P and the reset point P to the starting point O form a top-pressure stroke area and a reset stroke area, respectively. The reset wheel is provided with a reset track guide. The dynamic component in the present invention divides the working process of the plunger rod into two corresponding different parts for action execution, which not only reduces the radial force borne by the plunger rod during movement and the load force pushed by the motor and increases the service life, but also can timely execute the push and reset work of the plunger rod to ensure the working effect of the plunger pump assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of plunger pump drives, and particularly relates to a drive mechanism for a plunger pump. Background Art

[0002] Plunger pumps are applied in multiple fields, such as in various equipment like airless sprayers and high-pressure cleaners.

[0003] For example, in a Chinese patent (Patent Authorization Publication No.: CN203725298U) for an airless sprayer with a vertically-mounted motor, it includes a motor, the output end of the motor is connected to a gearbox, the gearbox is connected to a cam link, and the cam link is connected to a plunger pump. It is characterized in that: the motor is vertically disposed inside the sprayer, the gearbox is horizontally disposed inside the sprayer, the plunger pump includes a fixed end and a removable end, the fixed end is fixed to the gearbox housing, and the removable end is provided with a circular boss, and the fixed end is provided with a groove matching the circular boss. In this patent, the motor drives the cam link through multiple gears, thereby driving the piston rod to reciprocate. However, in this structure, the cam link bears a large transmission force and is prone to damage.

[0004] Another example is a Chinese patent (Patent Authorization Publication No.: CN212642972U) for a plunger pump assembly of a high-pressure cleaner, which includes a motor, a housing, an end cover, a reduction mechanism, a swash plate plunger mechanism, and a pump body mechanism. It is characterized in that: the reduction mechanism, the swash plate plunger mechanism, and the pump body mechanism are correspondingly installed inside the housing and the end cover. The reduction mechanism includes an output gear fixed on the output shaft of the motor and an internal gear sleeve. The swash plate plunger mechanism includes a swash plate, a plunger, and a plunger bracket. A central shaft is provided inside the housing, the swash plate is rotatably installed on the central shaft through a deep groove bearing, the internal gear sleeve is embedded in the swash plate and meshes with the output gear, a thrust roller bearing is installed on the inclined surface of the swash plate, the plunger bracket is installed inside the housing, and the plunger is correspondingly provided with an internal gear snap ring and a plunger spring and is slidably arranged on the plunger bracket; during operation, the motor drives the swash plate to rotate through the reduction mechanism, and the swash plate drives the plunger to reciprocate linearly through the thrust roller bearing. In this patent, the motor drives the plunger to move by rotating the swash plate and cooperates with the plunger spring for the reset of the plunger. However, during the reciprocating movement of the plunger, the plunger spring is compressed. The compression of the plunger spring during the high-frequency reciprocating movement of the plunger will cause elastic fatigue, thereby affecting the reset effect of the plunger and further affecting the normal operation of the plunger.

[0005] In summary, in order to better meet the usage requirements, it is very necessary to improve the defects existing in the existing plunger pump transmission structure. Summary of the Invention

[0006] The purpose of the present invention is to provide a drive mechanism for a plunger pump to solve the problems raised in the above background art.

[0007] In order to solve the above technical problems, the technical solution of the present invention is as follows: a driving mechanism for a plunger pump, comprising a motor and a plunger pump assembly, wherein the motor and the plunger pump assembly are connected by a mounting frame, wherein a transmission assembly is provided in the mounting frame, wherein the transmission assembly comprises a transmission wheel, a reset wheel and a rotating shaft, wherein the transmission wheel and the reset wheel are connected to the mounting frame by the rotating shaft; wherein the transmission wheel is connected by a transmission to the motor shaft of the motor and is provided with a pressing cam surface, wherein the end of the plunger rod in the plunger pump assembly is pressed against the pressing cam surface, wherein a starting point O and a reset point P are provided on the pressing cam surface, wherein a pressing stroke area and a reset stroke area are formed from the starting point O to the reset point P and from the reset point P to the starting point O, respectively; wherein a reset track guide rail is provided on the reset wheel, wherein the transmission wheel and the reset wheel rotate synchronously, wherein the pressing stroke area corresponding to the starting point O to the reset point P will press the plunger rod forward, and when the plunger rod enters the reset stroke area corresponding to the reset point P to the starting point O, the reset track guide rail on the reset wheel pushes the plunger rod to cooperate in resetting.

[0008] In the above-mentioned driving mechanism for a plunger pump, the plunger rod is provided with a reset guide groove which can be pushed in correspondence with the reset track guide rail. When the end of the plunger rod begins to enter the reset stroke area, the reset track guide rail on the reset wheel enters the reset guide groove. The reset wheel rotates to push the plunger rod to reset through the reset track guide rail thereon and the reset guide groove. The reset track guide rail disengages from the reset guide groove, and the end of the plunger rod enters the top pressing stroke area accordingly.

[0009] In the above-mentioned driving mechanism for a plunger pump, the mounting frame includes a front frame and a rear frame, and the plunger pump assembly is fixedly connected to the rear frame via a base plate.

[0010] In the above-mentioned driving mechanism for a plunger pump, a rolling ball is provided on the end of the plunger rod that abuts against the pressing cam surface on the transmission wheel.

[0011] In the above-mentioned driving mechanism for a plunger pump, a positioning rolling groove corresponding to the end of the plunger rod is provided on the pressing cam surface of the transmission wheel.

[0012] In the above-mentioned driving mechanism for a plunger pump, a ball groove for mounting a rolling ball is provided at the end of the plunger rod.

[0013] In the above-mentioned driving mechanism for a plunger pump, the reset track guide rail and the reset wheel are an integrated fixed structure.

[0014] In the above-mentioned driving mechanism for a plunger pump, the transmission wheel and the reset wheel are fixedly connected to the rotating shaft.

[0015] In the above-mentioned driving mechanism for a plunger pump, a transmission tooth portion is provided on the transmission wheel, and the transmission wheel is meshed with the motor shaft of the motor through the transmission tooth portion for transmission.

[0016] The beneficial effects of the present invention are as follows:

[0017] In the present invention, the designed transmission assembly pushes the plunger rod in the plunger pump assembly during operation. Among them, the driving wheel is responsible for pressing and pushing the plunger rod, and the return wheel is responsible for pushing and resetting the plunger rod; the transmission assembly divides the working process of the plunger rod into two corresponding parts for action execution. This not only reduces the radial force and the load force pushed by the motor during the movement of the plunger rod, improves the service life, but also can timely execute the pushing and resetting work of the plunger rod to ensure the working effect of the plunger pump assembly.

[0018] The designed transmission assembly in the present invention and the transmission connection of the plunger rod are convenient for disassembly and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structure diagram of the present invention;

[0020] Figure 2 is a three-dimensional diagram of the driving wheel in the present invention;

[0021] Figure 3 is an exploded view of the present invention;

[0022] Figure 4 is a three-dimensional structure diagram of another direction of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; in the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship 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 should not be construed as a limitation of the present invention.

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Please refer to Figures 1 to 4The present invention provides a driving mechanism for a plunger pump, comprising a motor 1 and a plunger pump assembly 2. The motor 1 and the plunger pump assembly 2 are connected to each other through a mounting frame 3. A transmission assembly is provided in the mounting frame 3. The transmission assembly comprises a transmission wheel 4, a reset wheel 5 and a rotating shaft 6. The transmission wheel 4 and the reset wheel 5 are connected to the mounting frame 3 through the rotating shaft 6. The transmission wheel 4 and the reset wheel 5 are fixedly connected to the rotating shaft 6. A transmission tooth portion 4-1 is provided on the transmission wheel 4. The transmission wheel 4 is meshed with the motor shaft 1-1 of the motor 1 through the transmission tooth portion 4-1 for transmission.

[0026] The transmission wheel 4 is transmission-connected with the motor shaft 1-1 of the motor 1 and is provided with a pressing cam surface 7. The end of the plunger rod 2-1 in the plunger pump assembly 2 rests against the pressing cam surface 7. The pressing cam surface 7 is provided with a starting point O and a reset point P, respectively. A pressing stroke area 8 and a reset stroke area 9 are formed from the starting point O to the reset point P and from the reset point P to the starting point O, respectively; the reset wheel 5 is provided with a reset track guide 10, and the transmission wheel 4 and the reset wheel 5 rotate synchronously. The pressing stroke area 8 corresponding to the starting point O to the reset point P will press the plunger rod 2-1 forward. When entering the reset stroke area 9 corresponding to the reset point P to the starting point O, the reset track guide 10 on the reset wheel 5 pushes the plunger rod 2-1 to cooperate in resetting.

[0027] Specifically, the plunger rod 2-1 is provided with a reset guide groove 11 which can cooperate with the reset track guide rail 10 to push. When the end of the plunger rod 2-1 begins to enter the reset stroke area 9, the reset track guide rail 10 on the reset wheel 5 enters the reset guide groove 11. The reset wheel 5 rotates to push the plunger rod 2-1 to reset through the reset track guide rail 10 thereon and the reset guide groove 11. The reset track guide rail 10 disengages from the reset guide groove 11, and the end of the plunger rod 2-1 enters the top pressing stroke area 8 accordingly.

[0028] During use, the motor 1 drives the transmission wheel 4 to rotate through its motor shaft 1-1. The transmission wheel 4 presses the plunger rod 2-1 forward through the pressing cam surface 7 thereon. During the rotation of the transmission wheel 4, the pressing stroke area 8 corresponding to the starting point O to the reset point P of the pressing cam surface 7 presses the plunger rod 2-1 forward. After entering the reset stroke area 9 corresponding to the reset point P to the starting point O, the pressing cam surface 7 no longer presses the plunger rod 2-1. At the same time, the reset track guide 10 on the reset wheel 5 enters the reset guide groove 11 on the plunger rod 2-1. As the reset wheel 5 rotates, the plunger rod 2-1 is pushed back into place through the cooperation of the reset track guide 10 and the reset guide groove 11 thereon. During the process of the reset wheel 5 pushing the plunger rod 2-1 back into place, the end of the plunger rod 2-1 is kept in contact with the pressing cam surface 7; the reset track guide 10 disengages from the reset guide groove 11, and the end of the plunger rod 2-1 correspondingly enters the pressing stroke area 8, and so on in a cycle. The transmission wheel 4 and the reset wheel 5 cooperate to complete the pushing work of the plunger rod 2-1.

[0029] Further, in order to cooperate with the design of the transmission assembly and facilitate the installation and connection of the plunger pump assembly, the mounting frame 3 includes a front frame 3-1 and a rear frame 3-2, and the plunger pump assembly 2 is fixedly connected to the rear frame 3-2 through a base plate 12.

[0030] Further, a rolling ball 14 is provided at the end of the plunger rod 2-1 that abuts against the pressing cam surface 7 of the transmission wheel 4. At the same time, a ball groove 16 for installing the rolling ball 14 is provided at the end of the plunger rod 2-1; thereby reducing the friction between the end of the plunger rod 2-1 and the pressing cam surface 7 of the transmission wheel 4.

[0031] Further, a positioning rolling groove 15 corresponding to the end of the plunger rod 2-1 is provided on the pressing cam surface 7 of the transmission wheel 4, and the rolling ball 14 at the end of the plunger rod 2-1 is correspondingly located in the positioning rolling groove 15, thereby ensuring the stable abutment during the relative rotation between the pressing cam surface 7 of the transmission wheel 4 and the plunger rod 2-1.

[0032] Preferably, in order to ensure the strength of the reset wheel's reset track guide 10 to push the plunger rod 2-1 back into place, the reset track guide 10 and the reset wheel 5 are of an integral fixed structure.

[0033] The above has introduced in detail a driving mechanism for a plunger pump provided by an embodiment of the present invention. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the technical solution disclosed by the present invention; at the same time, for general technical users in the field, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A driving mechanism for a plunger pump, comprising a motor (1) and a plunger pump assembly (2). Characterized in that: A transmission connection is carried out between the motor (1) and the plunger pump assembly (2) through a mounting frame (3). A transmission component is provided in the mounting frame (3). The transmission component includes a transmission wheel (4), a reset wheel (5), and a rotating shaft (6). The transmission wheel (4) and the reset wheel (5) are connected to the mounting frame (3) through the rotating shaft (6). The transmission wheel (4) is in transmission connection with the motor shaft (1-1) of the motor (1) and is provided with a pressing cam surface (7). The end of the plunger rod (2-1) in the plunger pump assembly (2) abuts against the pressing cam surface (7). Starting points O and a reset point P are respectively provided on the pressing cam surface (7). A pressing stroke area (8) and a reset stroke area (9) are respectively formed from the starting point O to the reset point P and from the reset point P to the starting point O. A reset track guide (10) is provided on the reset wheel (5). The transmission wheel (4) and the reset wheel (5) rotate synchronously. The pressing stroke area (8) corresponding to the starting point O to the reset point P will press and advance the plunger rod (2-1). When entering the reset stroke area (9) corresponding to the reset point P to the starting point O, the reset track guide (10) on the reset wheel (5) pushes the plunger rod (2-1) to cooperate with the reset. A reset guide groove (11) that can correspond and cooperate with the reset track guide (10) to push is provided on the plunger rod (2-1). When the end of the plunger rod (2-1) starts to enter the reset stroke area (9), the reset track guide (10) on the reset wheel (5) enters the reset guide groove (11). The reset wheel (5) rotates and cooperates with the reset track guide (10) on it and the reset guide groove (11) to push the plunger rod (2-1) to reset. The reset track guide (10) disengages from the reset guide groove (11), and the end of the plunger rod (2-1) correspondingly enters the pressing stroke area (8).

2. A driving mechanism for a plunger pump according to claim 1, Characterized in that: The mounting frame (3) includes a front frame (3-1) and a rear frame (3-2). The plunger pump assembly (2) is fixedly connected to the rear frame (3-2) through a base plate (12).

3. A driving mechanism for a plunger pump according to claim 1, Characterized in that: A rolling ball (14) is provided at the end of the plunger rod (2-1) that abuts against the pressing cam surface (7) of the transmission wheel (4).

4. A driving mechanism for a plunger pump according to claim 1 or 3, Characterized in that: A positioning rolling groove (15) corresponding to the end of the plunger rod (2-1) is provided on the pressing cam surface (7) of the transmission wheel (4).

5. A driving mechanism for a plunger pump according to claim 3, Characterized in that: A ball groove (16) for mounting the rolling ball (14) is provided at the end of the plunger rod (2-1).

6. A driving mechanism for a plunger pump according to claim 1, Characterized in that: The reset track guide (10) and the reset wheel (5) are of an integral fixed structure.

7. A driving mechanism for a plunger pump according to claim 1, It is characterized in that: The driving wheel (4), the reset wheel (5) are fixedly connected with the rotating shaft (6).

8. A driving mechanism for a plunger pump according to claim 1 or 7, It is characterized in that: The driving wheel (4) is provided with a driving tooth part (4-1), and the driving wheel (4) is meshed and driven with the motor shaft (1-1) of the motor (1) through the driving tooth part (4-1).

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