Handheld three-plunger motor pump

Abstract

The utility model relates to a handheld three-plunger motor pump, which comprises a motor and a pump body, the motor drives the pump body, the pump body comprises a transmission cavity and a main pump cavity, at least one oil leakage hole is arranged on the inner wall of a shell of the pump body, and the oil leakage hole is communicated with the transmission cavity and the main pump cavity. According to the handheld three-plunger motor pump, the effect that an inner cavity of the pump body of the motor pump is communicated is achieved, so that liquid lubricant flows to the planetary gear transmission assembly in a communicated mode, repeated overturning is not needed in the assembling process, and the handheld three-plunger motor pump designed according to the scheme has the advantages of being high in transmission efficiency, low in noise, few in assembling procedure and low in production cost. And the positioning of the transmission part and the structure of the overflow valve assembly are further improved, so that the working stability is higher.

Description

Technical Field

[0001] The utility model relates to the field of small liquid pumps, in particular to a handheld three-plunger motor pump. Background Art

[0002] At present, small three-plunger motor pumps are mainly used in portable cleaning machines. Publication No. CN217558476U discloses a three-plunger cleaning machine pump. When assembling this three-plunger cleaning machine pump, liquid lubricating oil needs to be added to the cavity of the pump body, and solid grease needs to be added to the cavity of the planetary gear part involved in the transmission. Compared with liquid lubricating oil, the solid grease lubrication method is inefficient and generates more heat, thereby reducing the overall transmission efficiency, increasing the temperature rise, and increasing the noise. In addition, the components are repeatedly flipped and assembled in two chambers during assembly, which increases the assembly steps and working hours.

[0003] Moreover, the radial positioning of the planetary gear transmission part and the drive shaft of this three-plunger cleaning machine pump is only positioned by a plane bearing. When a large-angle swash plate is selected, the radial component of the plunger becomes larger, and the radial positioning becomes less reliable. The drive shaft will swing during long-term operation and the operation will be unstable.

[0004] In addition, in the prior art, the valve core of the overflow valve of the handheld cleaning machine pump mostly adopts a conical structure, and the sealing reliability of the cone pressure valve is poor. Utility Model Content

[0005] The utility model aims at solving the current problems and provides a handheld three-plunger motor pump. By arranging an oil leakage hole on the inner wall of the pump body, the inner cavity of the motor pump body is communicated with each other, so that the liquid lubricant can flow to the planetary gear transmission component without repeated flipping and assembly, so as to solve the problems of low transmission efficiency, high heat generation, high noise, complex assembly process and long assembly time of the planetary gear transmission part of the three-plunger motor pump in the prior art.

[0006] In order to achieve the above-mentioned invention object, the utility model provides the following technical solutions:

[0007] A handheld three-plunger motor pump comprises a motor and a pump body, wherein the motor drives the pump body, the pump body comprises a transmission chamber and a main pump chamber, at least one oil leakage hole is provided on the inner wall of the pump body shell, and the oil leakage hole connects the transmission chamber and the main pump chamber.

[0008] The beneficial effects of adopting this structure are as follows: the oil leakage hole can connect the transmission chamber and the main pump chamber in the pump body, and the liquid lubricating oil can flow through the oil leakage hole. In this way, during the assembly process of the pump body, only liquid lubricating oil needs to be added to one of the chambers, reducing the assembly process.

[0009] Furthermore, there are multiple oil leakage holes, and the multiple oil leakage holes are evenly distributed on the inner wall of the shell of the pump body.

[0010] Furthermore, there are four oil leakage holes, the inner wall of the pump body is cylindrical, and the four oil leakage holes are arranged at equal angles of 90 degrees along the cylindrical inner wall of the shell.

[0011] Furthermore, a planetary gear transmission assembly is provided in the transmission chamber, and the planetary gear transmission assembly includes a sun gear, a planetary gear lower bracket, a planetary gear, a planetary pin, a planetary gear upper bracket and a gear ring, the planetary gear is fixedly connected to the planetary pin, and the two ends of the planetary pin are respectively fixedly connected to the planetary gear lower bracket and the planetary gear upper bracket, the planetary gear is internally meshed with the sun gear and externally meshed with the gear ring, and the sun gear is fixedly connected to the output shaft of the motor; the main pump chamber is provided with a transmission shaft, a swash plate and a plunger, the planetary gear upper bracket is fixedly connected to one end of the transmission shaft, and the other end of the transmission shaft is fixedly connected to the swash plate, and the inclined surface of the swash plate is against the plunger; the end outer sleeve of the planetary gear lower bracket is provided with a first locating bearing, and the middle outer sleeve of the transmission shaft is provided with a second locating bearing.

[0012] The beneficial effects of adopting this structure are as follows: the planetary gear transmission assembly and the transmission shaft act as a transmission whole, and are positioned at two points by the first locating bearing and the second locating bearing respectively, so as to realize radial support of the transmission shaft and ensure its reliability during operation.

[0013] Furthermore, the first locating bearing and the second locating bearing are both deep groove ball bearings.

[0014] Furthermore, a thrust bearing is sleeved on the swash plate, and the thrust bearing abuts against the plunger.

[0015] Furthermore, the pump body is provided with a water inlet and a water outlet, an overflow valve assembly is provided between the water inlet and the water outlet, the overflow valve assembly includes a valve body, a valve seat and a valve core, the valve core is a cylindrical structure and is arranged in the valve body, one end of the valve core is provided with a return spring that is against the valve seat, the other end of the valve core is provided with a water inlet hole and extends out of the valve port of the valve body, and an O-ring is provided at the valve port.

[0016] The beneficial effects of adopting this structure are as follows: the overflow valve with a conical valve core in the prior art is improved into a cylindrical structure, and an O-ring is arranged at the valve port of the valve body. The cylindrical valve core squeezes the O-ring, and the existing linear contact seal is improved into a surface contact seal, which has better sealing reliability.

[0017] Furthermore, the water inlet hole includes an axial channel and a plurality of radial channels, and the plurality of radial channels are all connected to the axial channel.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1. By opening an oil leakage hole structure on the pump body, the upper and lower parts of the pump body are connected, and the planetary gear part also uses liquid lubricating oil to improve the gear transmission efficiency, reduce the gear friction temperature rise, and reduce noise; and during assembly, only liquid lubricating oil needs to be added, and there is no need to repeatedly flip the assembly, which reduces the assembly process and reduces the production cost.

[0020] 2. The planetary gear transmission assembly and the transmission shaft are used as a transmission whole. The first locating bearing and the second locating bearing are used for two-point positioning to achieve radial support of the transmission shaft. Even if a large-angle swash plate is used, when the radial force of the plunger becomes larger, the swing of the transmission shaft can be effectively avoided, ensuring its reliability in long-term operation.

[0021] 3. The O-ring and the overflow valve core are radially sealed to achieve the reliability of the overflow valve sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional diagram of a handheld three-plunger motor pump of the utility model;

[0023] Figure 2 It is a cross-sectional schematic diagram of a handheld three-plunger motor pump of the utility model;

[0024] Figure 3 for Figure 2 Schematic diagram of the cross section along the AA direction;

[0025] Figure 4 for Figure 2 Enlarged view of point B in the middle.

[0026] Markings in the figure: 1 is the motor, 2 is the pump body, 3 is the transmission chamber, 4 is the main pump chamber, 5 is the oil leakage hole, 6 is the sun gear, 7 is the planetary gear lower bracket, 8 is the planetary gear, 9 is the planetary pin, 10 is the planetary gear upper bracket, 11 is the ring gear, 12 is the transmission shaft, 13 is the swash plate, 14 is the plunger, 15 is the first locating bearing, 16 is the second locating bearing, 17 is the water inlet, 18 is the water outlet, 19 is the overflow valve assembly, 19-1 is the valve body, 19-2 is the valve seat, 19-3 is the valve core, 19-4 is the O-ring, 19-5 is the water inlet hole, 19-6 is the return spring, 20 is the thrust bearing, and 21 is the accessory connector. DETAILED DESCRIPTION

[0027] The utility model is described in detail below in conjunction with the accompanying drawings.

[0028] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present invention.

[0030] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0031] like Figure 1-4 The utility model provides a handheld three-plunger motor pump, including a motor 1 and a pump body 2. The motor 1 drives the pump body 2. The pump body 2 includes a transmission chamber 3 and a main pump chamber 4. At least one oil leakage hole 5 is provided on the inner wall of the shell of the pump body 2. The oil leakage hole 5 connects the transmission chamber 3 and the main pump chamber 4. The oil leakage hole 5 can make the transmission chamber 3 and the main pump chamber 4 of the pump body 2 communicate with each other, and liquid lubricating oil can flow through the oil leakage hole 5. In this way, during the assembly process of the pump body 2, only liquid lubricating oil needs to be added, and there is no need to repeatedly flip the assembly, thereby reducing the assembly process.

[0032] There are multiple oil leakage holes 5, and the multiple oil leakage holes 5 are evenly distributed on the inner wall of the shell of the pump body 2. The multiple oil leakage holes 5 can be liquid lubricating oil evenly filling the cavity to improve the circulation efficiency. In this embodiment, there are 4 oil leakage holes 5, and the inner wall of the shell of the pump body 2 is cylindrical. The 4 oil leakage holes 5 are arranged at 90 degrees along the inner wall of the cylindrical shell.

[0033] A planetary gear transmission assembly is provided in the transmission chamber 3, and the planetary gear transmission assembly includes a sun gear 6, a planetary gear lower bracket 7, a planetary gear 8, a planetary pin 9, a planetary gear upper bracket 10 and a ring gear 11. The planetary gear 8 is interference fit with the planetary pin 9, and the two ends of the planetary pin 9 are respectively interference fit to fix the planetary gear lower bracket 7 and the planetary gear upper bracket 10. The planetary gear 8 meshes with the sun gear 6 internally and meshes with the ring gear 11 externally.

[0034] The sun gear 6 is fixedly connected to the output shaft of the motor 1; the main pump chamber 4 is provided with a transmission shaft 12, a swash plate 13 and a plunger 14; the planetary upper bracket 10 is fixedly connected to one end of the transmission shaft 12, and the other end of the transmission shaft 12 is fixedly connected to the swash plate 13, and the inclined surface of the swash plate 13 is against the plunger 14; the end of the planetary lower bracket 7 is provided with a first locating bearing 15, and the middle of the transmission shaft 12 is provided with a second locating bearing 16. The planetary gear transmission assembly and the transmission shaft 12 are used as a transmission whole, and two-point positioning is performed by the first locating bearing 15 and the second locating bearing 16 to achieve radial support of the transmission shaft 12 and ensure its reliability during operation. In this embodiment, the first locating bearing 15 and the second locating bearing 16 are both deep groove ball bearings. In this embodiment, a thrust bearing 20 is sleeved on the swash plate 13, and the thrust bearing 20 is against the plunger 14.

[0035] A water inlet 17 and a water outlet 18 are provided on the pump body 2. The water outlet 18 is provided with an accessory connector 21. An overflow valve assembly 19 is also provided between the water inlet 17 and the water outlet 18. The overflow valve assembly 19 includes a valve body 19-1, a valve seat 19-2 and a valve core 19-3. The valve core 19-3 is a cylindrical structure and is arranged in the valve body 19-1. One end of the valve core 19-3 is against the valve seat 19-2 through a return spring 19-6. A water inlet hole 19-5 is provided on the other end of the valve core 19-3 and extends out of the valve port of the valve body 19-1. The water inlet hole 19-5 includes an axial channel 19-51 and multiple radial channels 19-52. The multiple radial channels 19-52 are all connected to the axial channel 19-51. An O-ring 19-4 is provided at the valve port of the valve body 19-1.

[0036] The overflow valve of the conical valve core 19-3 in the prior art is improved into a cylindrical structure, and an O-ring 19-4 is set at the valve port of the valve body 19-1. The cylindrical valve core 19-3 squeezes the O-ring 19-4, and the existing linear contact seal is improved to a surface contact seal, which has better sealing reliability.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A handheld three-plunger motor pump, comprising a motor (1) and a pump body (2), wherein the motor (1) drives the pump body (2), and the pump body (2) comprises a transmission chamber (3) and a main pump chamber (4), characterized in that: At least one oil leakage hole (5) is provided on the inner wall of the pump body (2), and the oil leakage hole (5) is connected with the transmission chamber (3) and the main pump chamber (4).

2. A handheld three-plunger motor pump according to claim 1, characterized in that: There are a plurality of oil leakage holes (5), and the plurality of oil leakage holes (5) are evenly distributed on the inner wall of the shell of the pump body (2).

3. A handheld three-plunger motor pump according to claim 1 or 2, characterized in that: The number of the oil leakage holes (5) is four, the inner wall of the pump body (2) is cylindrical, and the four oil leakage holes (5) are arranged at equal angles of 90 degrees along the inner wall of the cylindrical shell.

4. A handheld three-plunger motor pump according to claim 1 or 2, characterized in that: A planetary gear transmission assembly is arranged in the transmission chamber (3), and the planetary gear transmission assembly comprises a sun gear (6), a planetary gear lower bracket (7), a planetary gear (8), a planetary pin (9), a planetary gear upper bracket (10) and a gear ring (11). The planetary gear (8) is fixedly connected to the planetary pin (9), and the two ends of the planetary pin (9) are respectively fixedly connected to the planetary gear lower bracket (7) and the planetary gear upper bracket (10). The planetary gear (8) is internally meshed with the sun gear (6) and externally meshed with the gear ring (11). The sun gear (6) is fixedly connected to the planetary pin (9). ) is fixedly connected to the output shaft of the motor (1); the main pump chamber (4) is provided with a transmission shaft (12), a swash plate (13) and a plunger (14); the planetary gear upper bracket (10) is fixedly connected to one end of the transmission shaft (12), and the other end of the transmission shaft (12) is fixedly connected to the swash plate (13), and the inclined surface of the swash plate (13) abuts against the plunger (14); the end sleeve of the planetary gear lower bracket (7) is provided with a first locating bearing (15), and the middle sleeve of the transmission shaft (12) is provided with a second locating bearing (16).

5. A handheld three-plunger motor pump according to claim 4, characterized in that: The first locating bearing (15) and the second locating bearing (16) are both deep groove ball bearings.

6. A handheld three-plunger motor pump according to claim 4, characterized in that: A thrust bearing (20) is sleeved on the swash plate (13), and the thrust bearing (20) abuts against the plunger (14).

7. A handheld three-plunger motor pump according to claim 1 or 2, characterized in that: The pump body (2) is provided with a water inlet (17) and a water outlet (18); an overflow valve assembly (19) is provided between the water inlet (17) and the water outlet (18); the overflow valve assembly (19) comprises a valve body (19-1), a valve seat (19-2) and a valve core (19-3); the valve core (19-3) is a cylindrical structure and is arranged in the valve body (19-1); a return spring (19-6) is sleeved on one end of the valve core (19-3) and abuts against the valve seat (19-2); a water inlet hole (19-5) is provided on the other end of the valve core (19-3) and extends out of the valve port of the valve body (19-1); an O-type sealing ring (19-4) is provided at the valve port.

8. A handheld three-plunger motor pump according to claim 7, characterized in that: The water inlet hole (19-5) comprises an axial channel (19-51) and a plurality of radial channels (19-52), and the plurality of radial channels (19-52) are all connected to the axial channel (19-51).

Images