Pressure medium power device capable of generating reciprocating motion
By designing a conical surface alignment structure between the main piston and the auxiliary piston in the pressure medium power device, the problem of difficulty in ensuring reliability, durability and accuracy in the manufacturing process of the pressure medium power device in the prior art is solved, and higher alignment accuracy and linear motion reliability are achieved.
Patent Information
- Application Number
- CN202380028168.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-03-18
- Filing Date
- 2023-03-15
- Publication Date
- 2025-03-14
AI Technical Summary
Existing pressure medium power plants are difficult to ensure reliability, durability and accuracy during manufacturing, especially when forming reciprocating parts.
A pressure medium power device including a main piston, an auxiliary piston and a control valve assembly is designed to achieve precise alignment and linear movement of the main piston and the auxiliary piston through alignment between the first conical surface and the second conical surface.
The device can form linear motion in a simple and reliable manner, improving the alignment accuracy of the components and overall reliability and durability.
Smart Images
Figure CN119630882A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a pressure medium power device that generates reciprocating motion.
[0002] It is important for such a pressure medium power unit to be reliable, durable and precise. Therefore, special expertise, precision and meticulousness are required in the manufacturing process of the pressure medium power unit. Summary of the invention
[0003] Therefore, the object of the present invention is to develop a new type of pressure medium powered device generating a reciprocating motion. The arrangement according to the invention is characterized as disclosed in the independent claim. Some embodiments of the invention are disclosed in the dependent claims.
[0004] Here, a pressure medium power device that produces reciprocating motion is proposed. The pressure medium power device includes a main body, a main piston assembled inside the main body, a control valve assembly configured to move the main piston back and forth, and at least one auxiliary piston attached to the main piston. The main piston includes a first conical surface and the auxiliary piston includes a corresponding second conical surface, whereby the main piston and the auxiliary piston are aligned with each other by means of the first conical surface and the second conical surface. With such an arrangement, the pressure medium power device can be formed in a simple and reliable manner so that the connected components are very straight relative to each other.
[0005] According to an embodiment, the center axis of the primary piston and the center axis of the auxiliary piston are located on the same axis. Therefore, the pressure medium power device is symmetrical and balanced.
[0006] According to an embodiment, the end of the auxiliary piston fits inside the main piston, whereby the first conical surface of the main piston is the inner surface of the cone and the second conical surface of the auxiliary piston is the outer surface of the cone. This arrangement provides extremely reliably aligned components.
[0007] According to an embodiment, the front surface of the primary surface facing the auxiliary piston does not contact the auxiliary piston.The conical surface then aligns the primary piston and the auxiliary piston very precisely with each other.
[0008] According to an embodiment, the primary piston and the auxiliary piston are attached to each other by a threaded connection. This type of connection is simple, reliable and trustworthy.
[0009] According to an embodiment, the taper ratio of the first conical surface to the second conical surface is 1:20 or more, and according to another embodiment, the taper ratio of the first conical surface to the second conical surface is 1:1 or less. Such taper ratios provide reliable and precise alignment.
[0010] According to an embodiment, the pressure medium power device is a booster pump. In connection with the booster pump, it is particularly important that the primary piston and the auxiliary piston can be arranged exactly straight relative to each other. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The invention will now be described in more detail with reference to some embodiments and with reference to the accompanying drawings, in which:
[0012] Figure 1 is a schematic side sectional view of a booster pump;
[0013] Figure 2 is a schematic side view of a primary piston with two auxiliary pistons attached;
[0014] Figure 3 is a schematic side cross-sectional view of the attachment points of the primary and auxiliary pistons; and
[0015] Figure 4 is a schematic cross-sectional side view of the attachment points of the primary piston and the auxiliary piston according to another embodiment. DETAILED DESCRIPTION
[0016] Figure 1 A boost pump 1 is shown. Figure 1 The booster pump 1 shown is a hydraulic drive pump for a pressure washer.
[0017] The booster pump 1 comprises a main piston 2. A first auxiliary piston 3 and a second auxiliary piston 4 are attached to the main piston 2. The main piston 2 is fitted inside a body 5. The first auxiliary piston 3 extends inside a first cylinder 6. Correspondingly, the second auxiliary piston 4 extends inside a second cylinder 7. The first cylinder 6, the second cylinder 7 and the body 5 are simple cylindrical pieces.
[0018] There is a first cylinder space 8 inside the first cylinder 6, and a second cylinder space 9 inside the second cylinder 7. There are driving fluid spaces 10a and 10b inside the main body 5. The first cylinder space 8 and the second cylinder space 9 are separated from the driving fluid spaces 10a and 10b by a seal. The seal can be a pair of seals. There can be a seepage channel between the pair of seals.
[0019] The main piston 2 moves forward and backward in the body 5, and the first auxiliary piston 3 and the second auxiliary piston 4 attached to the main piston 2 perform pumping. Reference numeral 11 denotes a water inlet pipe, and reference numeral 12 denotes a water pressure pipe. The inlet pipe of the pressure fluid is shown by reference numeral 13. The return pipe of the pressure fluid is shown by reference numeral 14.
[0020] exist Figure 1 In the embodiment of the present invention, the control valve assembly that enables the main piston 2 to move forward and backward is assembled inside the main piston 2. The control valve assembly includes a control valve, and the control valve includes a valve piston 15a and a valve stem 15b.
[0021] exist Figure 1 In the case of the main piston 2 and the first auxiliary piston 3 and the second auxiliary piston 4 attached to the main piston have moved in the direction indicated by the arrows, that is, as in Figure 1 Move to the right as seen in. Figure 1 The movement of the pistons is shown at the extreme right. However, the valve piston 15a and the valve stem 15b are still in a position where the same pressure influences the different sides A and B of the main piston 2, and since the area of the side B is larger, the pressurized fluid pushes the main piston 2 further to the right. The valve piston 15a closes the passage 16 and, correspondingly, the valve stem 15b is in a position where the opening 17 is open.
[0022] exist Figure 1 In the case of , the seepage channel 18 has just reached the driving fluid space 10a. Figure 1 The pressure on the right-hand side of the valve piston 15a seen in FIG. 1 drops. The pressure reaching the valve piston 15a through the opening 17 causes the valve piston 15a and the valve stem 15b to shift to the right. The valve piston 15a then leaves the passage 16 open and the valve stem 15b closes the opening 17. The pressurized fluid in the drive fluid space 10b leaves along the passages 19 and 16 to the return pipe 14. The pressurized fluid entering from the inlet pipe 13 affects the ring surface A of the main piston 2 and pushes the main piston 2 to the right as shown in FIG. Figure 1 Seen on the left.
[0023] When the main piston 2 moves to the left, the valve piston 15a and the valve stem 15b remain in the right-hand position. When the main piston 2 reaches its left-hand limit position, the leakage channel 18 of the fluid reaches the driving fluid space 10b. Then, the pressure acting on the right-hand side of the valve piston 15a increases, which causes the valve piston 15a and the valve stem 15b to shift to the left again. Then the channel 16 is closed again and the opening 17 is opened, and the main piston starts to move to the right.
[0024] exist Figure 1 In the embodiment of FIG. 1 , the control valve assembly is thus configured such that the control valve and the control channel are assembled inside the main piston 2. It is obvious to a person skilled in the art that the control valve assembly can also be implemented in other ways.
[0025] Figure 2 A main piston 2 and attached thereto a first auxiliary piston 3 and a second auxiliary piston 4 are shown. The center axis of the main piston 2 and the center axes of the first auxiliary piston 3 and the second auxiliary piston 4 are located on the same axis A.
[0026] Figure 3Details of the attachment of the primary piston 2 and the first auxiliary piston 3 to each other are shown. The primary piston 2 and the first auxiliary piston 3 may be attached to each other, for example, by a threaded connection. It is also possible to attach the primary piston 2 and the first auxiliary piston 3 to each other in some other way, for example by a cotter pin, a wedge, a spring or a crimped connection.
[0027] The main piston 2 includes a first conical surface 20. The first auxiliary piston 3 includes a corresponding second conical surface 21. The main piston 2 and the first auxiliary piston 3 are aligned with each other by arranging the first conical surface 20 and the second conical surface 21 to face and touch each other. The end of the first auxiliary piston 3 is fitted inside the main piston 2. Then, the first conical surface 20 of the main piston 2 is the inner surface of the cone, and the second conical surface 21 of the first auxiliary piston 3 is the outer surface of the cone.
[0028] The taper ratio of the conical surface may be, for example, 1:20 or more. Then, the taper angle α is about 3° or more. Furthermore, the taper ratio of the conical surface may be, for example, 1:1 or less. Then, the taper angle α is about 45° or less.
[0029] exist Figure 3 In the embodiment of the invention, the piston diameter D of the auxiliary piston is larger than the peripheral diameter, i.e. the maximum diameter, of the control cone forming its second conical surface 21. Furthermore, the first auxiliary piston 3 and the main piston 2 are attached to each other so that the front surface 22 of the main piston 2 facing the first auxiliary piston 3 is arranged at a distance from the surface 23 of the first auxiliary piston 3 facing the main piston 2. Thus, the front surface 22 of the main piston 2 facing the first auxiliary piston 3 does not contact the auxiliary piston 3.
[0030] exist Figure 4 In the embodiment of the present invention, the piston diameter D of the first auxiliary piston 3 is smaller than the peripheral diameter (i.e., the maximum diameter of the control cone forming its second conical surface 21). In this way, no part of the first auxiliary piston 3 faces the front surface 22 of the main piston 2. Even so, the front surface 22 of the main piston 2 facing the first auxiliary piston 3 does not touch the first auxiliary piston 3.
[0031] Figure 1 The pressure medium powered device that generates reciprocating motion is a booster pump 1. The proposed arrangement for aligning the main piston 2 with the first auxiliary piston 3 and the second auxiliary piston 4 can also be applied in conjunction with the main piston and auxiliary piston of some other pressure medium driven device that generates reciprocating motion. Such a device can be, for example, a valve stem of a hydraulic valve. The valve stem can consist of two parts, and the above arrangement is applied in relation to these two parts.
[0032] A person skilled in the art finds it obvious that, as technology advances, the basic idea of the invention can be implemented in many different ways. Therefore, the invention and its embodiments are not limited to the examples described above, but may vary within the scope of the claims.
Claims
1. A pressure medium power device for generating reciprocating motion, the pressure medium power device comprising a main body (5), a main piston (2) installed in the main body (5), a control valve assembly configured to move the main piston (2) back and forth, and at least one auxiliary piston (3, 4) attached to the main piston (2), characterized in that: The primary piston (2) comprises a first conical surface (20) and the auxiliary pistons (3, 4) comprise a corresponding second conical surface (21), whereby the primary piston (2) and the auxiliary pistons (3, 4) are aligned with each other by means of the first conical surface (20) and the second conical surface (21).
2. The pressure medium power device according to claim 1, characterized in that: The central axis of the main piston (2) and the central axis of the auxiliary pistons (3, 4) are located on the same axis (A).
3. The pressure medium power device according to claim 1 or 2, characterized in that: The ends of the auxiliary pistons (3, 4) are fitted inside the main piston (2), whereby the first conical surface (20) of the main piston (2) is the inner surface of the cone and the second conical surface (21) of the auxiliary pistons (3, 4) is the outer surface of the cone.
4. A pressure medium power device according to any one of the preceding claims, characterized in that A front surface (22) of the primary piston (2) facing the auxiliary piston (3, 4) does not contact the auxiliary piston (3, 4).
5. A pressure medium power device according to any one of the preceding claims, characterized in that The primary piston (2) and the auxiliary pistons (3, 4) are attached to each other by a threaded connection.
6. A pressure medium power device according to any one of the preceding claims, characterized in that The taper ratio of the first conical surface and the second conical surface (20, 21) is 1:20 or more.
7. A pressure medium power device according to any one of the preceding claims, characterized in that The taper ratio of the first conical surface and the second conical surface (20, 21) is 1:1 or less.
8. A pressure medium power device according to any one of the preceding claims, characterized in that The pressure medium power device is a booster pump (1).