Structure of plunger pump

Abstract

The plunger pump structure comprises an oil cylinder, a plunger frame connected with the oil cylinder and a pump cover connected with the plunger frame, a water inlet channel is formed in the plunger frame, a conical barrel is arranged in the oil cylinder, the conical barrel is inverted, the small-diameter end of the conical barrel is close to the plunger frame, and the conical barrel rotates along with a swash plate. The oil cylinder is an integrally-formed part. When the oil cylinder works, the plunger pump works, the swash plate drives the conical barrel to rotate, and oil in the conical barrel flows upwards along the inner wall of the conical barrel under the action of centrifugal force and is thrown out from the large-diameter end of the conical barrel to cool parts in the oil cylinder. Water outside the pump flows through the water inlet channel, absorbs heat of oil and takes away the heat. The plunger pump has no heat dissipation requirement on the oil cylinder, and an integrated plastic part with low cost can be adopted, so that the cost is saved, and the light weight of the plunger pump is facilitated.

Description

Technical Field

[0001] The present invention relates to a pump, in particular to a plunger pump. Background Art

[0002] The swash plate type plunger pump includes an oil cylinder, a plunger frame, and a pump cover. A reduction device, a swash plate connected to the reduction device, and a plunger matched with the swash plate are arranged in the oil cylinder. The plunger frame is connected to the oil cylinder. The plunger frame is provided with a plunger guide hole. The plunger in the oil cylinder passes through the plunger guide hole and extends to the pump cover connected to the plunger frame. A water cavity is arranged in the pump cover, and the water cavity is connected with a water inlet channel and a drainage channel. A motor bracket is installed on the oil cylinder, and a motor is installed on the motor bracket. The motor bracket is connected to the oil cylinder through a connector, and a seal is required between the two. Driven by the motor, the swash plate rotates, driving a plurality of plungers to reciprocate axially. One end of the plunger extending into the water cavity changes the space of the water cavity, thereby completing water absorption and drainage.

[0003] Oil is sealed in the cylinder to lubricate and dissipate heat for the parts in the cylinder. In order to reduce the temperature of the oil, the cylinder uses aluminum products with good heat dissipation performance. Alternatively, in order to save costs or reduce the weight of the plunger pump, the cylinder is partially made of aluminum products and partially made of plastic parts. In this way, the cylinder is a combination of aluminum products and plastic parts.

[0004] The pump cover is integrated with a water inlet channel and a drainage channel. The water inlet and drainage port of the plunger pump are integrated on the pump cover and distributed around the water cavity. Obviously, there is a distance between the water inlet channel, the drainage channel and the oil cylinder. At least, there is a plunger rack between the water channel and the oil cylinder. The water in the water channel and the oil in the oil cylinder are far away from each other and do not interfere with each other. Summary of the invention

[0005] The technical problem solved by the present invention is: how to make the oil cylinder adopt an integrated plastic part to save costs and lighten the plunger pump.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a structure of a plunger pump, including an oil cylinder, a plunger frame connected to the oil cylinder, and a pump cover connected to the plunger frame, the plunger frame is provided with a water inlet channel, a conical cylinder is provided in the oil cylinder, the conical cylinder is inverted, and its small diameter end is close to the plunger frame, the conical cylinder rotates with the inclined plate, and the oil cylinder and the motor bracket are integrally formed parts.

[0007] When the plunger pump is working, the swash plate drives the cone cylinder to rotate. Under the action of centrifugal force, the oil in the cone cylinder flows up along the inner wall of the cone cylinder and is thrown out at the large diameter end of the cone cylinder to cool the parts in the cylinder. After that, it flows down along the cylinder wall and returns to the bottom of the cylinder, that is, the upper surface of the plunger frame.

[0008] When the plunger pump is working, water outside the pump enters the water inlet channel, flows through the plunger frame, absorbs the heat from the oil on the surface of the plunger frame, and takes it away. Water outside the pump continuously flows through the water inlet channel, continuously absorbs the heat of the oil and takes it away.

[0009] The cooled oil is then carried to a higher place by the rotating conical cylinder, where it cools the parts in the cylinder and then flows back to the upper surface of the plunger rack.

[0010] The present invention utilizes the water flowing through the water inlet channel to cool the oil circulating in the oil cylinder. The oil cylinder itself does not need to dissipate heat, and low-cost parts without heat dissipation function can be used. Such parts can be one-piece molded parts, for example, one-piece molded plastic parts, which reduces the number of components, omits the assembly and connection process, saves costs, and is conducive to lightweighting of the plunger pump.

[0011] Since the water inlet channel needs to be arranged on the plunger frame, the water inlet and the drain outlet are designed separately, the water inlet is arranged on the plunger frame, and the drain outlet is arranged on the pump cover.

[0012] As a structural design choice, a first water inlet channel connecting structure is provided on the plunger frame, and a second water inlet channel connecting structure matched with the first water inlet channel connecting structure is provided on the pump cover, and the second water inlet channel connecting structure is connected with the water cavity on the pump cover. The pump cover is connected to the plunger frame, and the first water inlet channel connecting structure matches with the second water inlet channel connecting structure. Water from the water inlet enters the water inlet channel, first flows through the plunger frame, absorbs the heat of the oil, and then enters the water cavity of the pump cover through the first water inlet channel connecting structure and the second water inlet channel connecting structure. Under the action of the plunger, the water in the water cavity is pressed into the water outlet channel and sprayed out through the drain port.

[0013] As a structural option for the cone barrel to rotate with the swash plate, the cone barrel is connected to the swash plate. The swash plate is provided with a center hole, and the cone barrel fits in the center hole. After the oil rising along the cone barrel flows out of the top of the cone barrel, it can continue to rise along the center hole of the swash plate to cool the parts above the swash plate, thereby expanding the cooling range.

[0014] As an option for the connection structure between the tapered cylinder and the slanted plate, a clamping structure is provided on the inner wall of the center hole, and the tapered cylinder is provided with a clamping hook that cooperates with the clamping structure, which has a simple structure and is easy to install.

[0015] Different from the prior art in which the rotation centers of the motor shaft and the swash plate are not concentric, the motor shaft installed on the motor bracket of the present invention is coaxial with the rotation center axis of the swash plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings:

[0017] Figure 1 A schematic diagram of the structure of a plunger pump;

[0018] Figure 2 This is an exploded diagram of a plunger pump;

[0019] Figure 3 for Figure 2 A schematic diagram of the plunger frame 20 observed from below;

[0020] Figure 4 for Figure 2 Schematic diagram of the pump cover 30 observed from below;

[0021] Figure 5 is a schematic diagram of the swash plate 11;

[0022] Figure 6 Schematic diagram of the conical cylinder 40.

[0023] Explanation of symbols in the figure:

[0024] 10. Oil cylinder; 11. Swash plate; 110. Center hole; 12. Planetary gear reduction device; 122. Planet carrier; 123. Ring gear; 13. Bearing;

[0025] 20. plunger frame; 21. water inlet channel; 22. water inlet; 23. first connecting structure of water inlet channel; 24. second connecting structure of water inlet channel; 25. plunger hole; 26. plunger; 27. return spring;

[0026] 30. Pump cover; 31. Water outlet; 32. Drain port; 33. Water cavity;

[0027] 40. Conical tube; 41. Hook. DETAILED DESCRIPTION

[0028] Combination Figures 1 to 3 A structure of a plunger pump includes an oil cylinder 10, a plunger frame 20 connected to the oil cylinder, and a pump cover 30 connected to the plunger frame. The plunger frame is provided with a water inlet channel 21. A conical cylinder 40 is provided in the oil cylinder. The conical cylinder is inverted, and its small diameter end is close to the plunger frame. The conical cylinder rotates with the inclined plate 11. The oil cylinder and the motor bracket are integrally formed parts.

[0029] The oil cylinder 10 and the motor bracket are integrally formed parts, for example, integrally injection-molded plastic parts.

[0030] A planetary gear reduction device 12 is provided in the oil cylinder 10, a motor outside the oil cylinder is connected to the sun gear of the planetary gear reduction device, a swash plate 11 is connected to a planet carrier 122 of the planetary gear reduction device 12, and a ring gear 123 of the planetary gear reduction device is fixedly fitted in the oil cylinder 10. The connection between the swash plate 11 and the planet carrier 122 can be a snap connection, a pin and a hole fit, or a connector connection.

[0031] A plunger 26 is fitted in the plunger hole 25 of the plunger frame 20, the top end of the plunger is located in the oil cylinder 10 and abuts against the swash plate 11; the bottom end of the plunger is located in the water cavity 33 of the pump cover 30. A return spring 27 is fitted on the plunger 26.

[0032] When the plunger pump is working, the swash plate 11 drives the conical cylinder 40 to rotate. Under the action of centrifugal force, the oil in the conical cylinder 40 flows up along the inner wall of the conical cylinder and is thrown out at the large diameter end of the conical cylinder to cool the parts in the cylinder 10. Then, it flows down along the inner wall of the cylinder 10 and returns to the bottom of the cylinder, that is, the upper surface of the plunger frame 20.

[0033] When the plunger pump is working, water outside the plunger pump enters the water inlet channel 21, flows through the plunger frame 20, absorbs the heat from the oil on the upper surface of the plunger frame, and takes it away. The water outside the plunger pump continuously flows through the water inlet channel 21, continuously absorbs the heat of the oil and takes it away. In the oil cylinder 10, the cooled oil is brought to a high place by the rotating conical cylinder 40, cools the parts in the oil cylinder 10, and then flows back to the upper surface of the plunger frame 20. The water in the water inlet channel 21 on the plunger frame 20 cools the oil. This process is repeated, and the oil circulating in the oil cylinder is cooled by water, and the parts in the oil cylinder are cooled by oil.

[0034] Different from the prior art in which the water inlet and the drain outlet are integrated on the pump cover, the water inlet 22 and the drain outlet 32 ​​of the present invention are designed separately, the water inlet is arranged on the plunger frame 20 , and the drain outlet is arranged on the pump cover 30 .

[0035] Combination Figure 2 , Figure 3 The plunger frame 20 is provided with a first connecting structure 23 of the water inlet channel, and the pump cover 30 is provided with a second connecting structure 24 of the water inlet channel that cooperates with the first connecting structure of the water inlet channel. The second connecting structure of the water inlet channel is connected with the water cavity 33 on the pump cover. The pump cover 30 is connected to the plunger frame 20, and the first connecting structure 23 of the water inlet channel cooperates with the second connecting structure 24 of the water inlet channel. Water from the water inlet 22 enters the water inlet channel 21, first flows through the plunger frame 20, absorbs the heat of the oil, and then enters the water cavity 33 of the pump cover 30 through the first connecting structure 23 of the water inlet channel and the second connecting structure 24 of the water inlet channel. Under the action of the plunger, the volume of the water cavity 33 changes, and the water in the water cavity is pressed into the water outlet channel 31 and sprayed out through the drain port 32. Among them, a one-way valve is provided at the second connecting structure 24 of the water inlet channel to make water flow into the water cavity 33 in one direction; a one-way valve is provided on the water outlet channel 31 to make water flow out of the water cavity 33 in one direction.

[0036] In order to enable the conical cylinder 40 to rotate with the swash plate 11, the conical cylinder 40 is connected to the swash plate 11. Figure 5The swash plate 11 is provided with a center hole 110, and the conical cylinder 40 fits in the center hole. After the oil rising along the conical cylinder 40 flows out of the top of the conical cylinder, it can continue to rise along the center hole 110 of the swash plate 11 to cool the bearings and the planetary gear reduction device 12 above the swash plate.

[0037] In order to realize the connection between the conical cylinder 40 and the swash plate 11, a clamping structure, such as a clamping groove, is provided on the inner wall of the center hole 110. Figure 6 The conical cylinder 40 is provided with a hook 41 that cooperates with the clamping structure. When the pair of hooks 41 arranged at the top of the conical cylinder 40 are inserted into the center hole 110, elastic deformation occurs in opposite directions. The conical cylinder 40 continues to go deeper into the center hole 110, and when the pair of hooks 41 are aligned with the pair of slots, the pair of hooks 41 are reset and fit into the slots, thereby realizing the connection between the conical cylinder 40 and the swash plate 11.

[0038] The motor shaft installed on the motor bracket of the present invention is coaxial with the rotation center axis of the swash plate 11 .

[0039] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A plunger pump structure, comprising an oil cylinder (10), a plunger frame (20) connected to the oil cylinder, and a pump cover (30) connected to the plunger frame, wherein the plunger frame is provided with a water inlet channel (21), a conical cylinder (40) is provided in the oil cylinder, the conical cylinder is inverted, and its small diameter end is close to the plunger frame, and the conical cylinder rotates with the swash plate (11), characterized in that: The oil cylinder and the motor bracket are integrally formed parts.

2. The structure of a plunger pump as claimed in claim 1, characterized in that: The oil cylinder (10) is a plastic part.

3. The structure of a plunger pump according to claim 1, characterized in that: The water inlet (22) and the water outlet (32) are designed separately, the water inlet is arranged on the plunger frame (20), and the water outlet is arranged on the pump cover (30).

4. The structure of a plunger pump according to claim 1, characterized in that: A first water inlet channel communication structure (23) is provided on the plunger frame (20), a second water inlet channel communication structure (24) matching the first water inlet channel communication structure is provided on the pump cover (30), and the second water inlet channel communication structure is communicated with the water cavity (33) on the pump cover.

5. The structure of a plunger pump according to claim 1, characterized in that: The conical cylinder (40) is connected to the swash plate (11).

6. The structure of a plunger pump according to claim 1, characterized in that: The swash plate (11) is provided with a central hole (110), and the tapered cylinder (40) is fitted in the central hole.

7. A plunger pump structure as claimed in claim 6, characterized in that: A clamping structure is provided on the inner wall of the central hole (110), and the conical cylinder (40) is provided with a clamping hook (41) matched with the clamping structure.

8. The structure of a plunger pump according to claim 1, characterized in that: The motor shaft mounted on the motor bracket is coaxial with the rotation center axis of the swash plate (11).

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