Plunger for plunger pump, plunger pump and cleaning machine

Abstract

The utility model provides a plunger for a plunger pump, the plunger pump and a cleaning machine. The plunger for the plunger pump comprises a plunger rod part and a head part connected with the plunger rod part, and the head part protrudes towards a working cavity of the plunger pump in the axial direction of the plunger rod part. In the direction from the plunger rod part to the working cavity, the structure, protruding out of the plunger rod part, of the head part comprises a top end with the cross section area gradually reduced. The protruding structure with the gradually-changed cross sectional area can play a guiding role in the liquid pushing process, the friction resistance of liquid to the plunger can be reduced in the liquid pushing process, and efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of variable displacement machinery, in particular to a plunger for a plunger pump, a plunger pump and a cleaning machine. BACKGROUND

[0002] The plunger pump of a high-pressure cleaning machine is a power mechanism for generating pressurized water, and the core component thereof is a plunger. The high-speed reciprocating motion of the plunger has a very high requirement on the performance of each plunger, and the energy efficiency of a plunger directly affects the efficiency of the entire pump.

[0003] Referring to Figure 1 , the end surface 300 of a common plunger facing the working chamber (the end for pushing liquid, Figure 1 the upper end) is a plane. In particular, when moving at a high speed, this plane design will generate additional resistance, increasing the energy consumption of the plunger pump. SUMMARY

[0004] In order to solve or improve at least one problem raised in the background art, the present application provides a plunger for a plunger pump, a plunger pump and a cleaning machine.

[0005] The plunger for a plunger pump provided by the embodiments of the present application comprises a plunger rod part and a head part connected to the plunger rod part, the head part protruding towards a working chamber of a plunger pump along the axial direction of the plunger rod part,

[0006] In the direction from the plunger rod part towards the working chamber, the structure of the head part protruding from the plunger rod part comprises a top end with a gradually decreasing cross-sectional area.

[0007] In at least one embodiment, the top end is rotationally symmetrical about the axis of the plunger for a plunger pump.

[0008] In at least one embodiment, the top end of the head part is a cone.

[0009] In at least one embodiment, the top end of the head part is a spherical protrusion.

[0010] In at least one embodiment, the head part comprises an arc surface.

[0011] In at least one embodiment, in the radial direction of the plunger for a plunger pump, the radial dimension of the head part is not greater than the radial dimension of the plunger rod part.

[0012] In at least one embodiment, the head part is inserted into the plunger rod part.

[0013] In at least one embodiment, the head part is integrally formed with the plunger rod part.

[0014] The plunger pump provided by the embodiments of the present application comprises:

[0015] A plunger for a plunger pump as described above;

[0016] A working chamber, the head of the plunger for a plunger pump faces the working chamber, and the plunger pump is configured such that when the plunger for a plunger pump moves away from the working chamber, the working chamber sucks liquid, when the plunger for a plunger pump moves towards the working chamber, the working chamber discharges liquid, and the head contacts and pushes the liquid in the working chamber.

[0017] The cleaning machine provided by the embodiments of the present application comprises a plunger for a plunger pump as described above.

[0018] The head of the plunger of the present application facing the working chamber has a convex structure with gradually changing cross-sectional area, which can guide the liquid pushing and reduce the frictional resistance of the liquid to the plunger when pushing the liquid. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A structure schematic diagram of a plunger for a plunger pump is shown.

[0020] Figure 2 A structure schematic diagram of a plunger for a plunger pump according to an embodiment of the present application is shown, and the head thereof is conical.

[0021] Figure 3 A structure schematic diagram of a plunger for a plunger pump according to another embodiment of the present application is shown, and the head thereof is a spherical convex, and the head is connected with the plunger rod part by plug-in connection.

[0022] Figure 4 A structure schematic diagram of a plunger for a plunger pump according to still another embodiment of the present application is shown, and the head thereof is also a spherical convex, and the head is integrally formed with the plunger rod part.

[0023] Figure 5 A microscope observation diagram of the plunger for a plunger pump with a conical head according to an embodiment of the present application when pushing liquid is shown.

[0024] Figure 6 A fluid analysis diagram of the plunger with a flat end surface is shown.

[0025] Figure 7 A fluid analysis diagram of the plunger for a plunger pump with a spherical convex head according to an embodiment of the present application is shown.

[0026] REFERENCE SIGNS

[0027] 100 plunger rod part

[0028] 200 head

[0029] 210 top end

[0030] 220 insertion end

[0031] 300 end face DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present application will be described hereinafter with reference to the accompanying drawings. It is to be understood that the specific description is only for the purpose of teaching one skilled in the art how to carry out the present application and not for the purpose of limiting the present application to all the possible ways of carrying it out.

[0033] The present application provides a plunger for a plunger pump, a plunger pump and a cleaning machine.

[0034] Referring to Figures 2 to 4 , the present application provides a plunger for a plunger pump (hereinafter, sometimes referred to as "plunger") which can include a plunger rod portion 100 and a head portion 200 connected to the plunger rod portion 100, the head portion 200 protruding along the axial direction of the plunger rod portion 100 toward a working chamber (not shown in the figure). In the direction from the plunger rod portion 100 toward the working chamber, the structure of the head portion 200 protruding from the plunger rod portion 100 includes a tip 210 with a gradually decreasing cross-sectional area to form a uniform protruding structure.

[0035] It should be understood that the plunger is located in the plunger pump and can control the liquid inflow and outflow by changing the size of the working chamber volume. The applicant found that the uniform protruding structure of the cross-sectional area of the head portion 200 can play a guiding role when the plunger moves toward the working chamber, which can reduce the frictional resistance of the liquid to the plunger when pushing the liquid.

[0036] Further, the tip 210 can be rotationally symmetrical about the axis of the plunger, realizing a protruding and non- eccentric arrangement in the form of a circular arc, so that the plunger is balanced in force and can reduce the vibration generated by the plunger when moving at high speed.

[0037] According to the fluidity of the fluid, when the plunger with a flat end face pushes the liquid, the liquid will expand to both sides to form a relatively large wave surface; while as Figure 5 shown, when the plunger with the conical head portion of one embodiment of the present application pushes the liquid, the wave surface is relatively small. Energy is conserved, and a large wave surface cannot help improve the performance of the plunger pump, but rather a kind of negative work, while the wave surface generated by the head portion 200 provided by the present application is small, so that the negative work can be reduced, the performance of the plunger pump can be improved, and the effect of saving energy can be achieved.

[0038] Further, referring to Figure 6 , Figure 7 , the present application also provides a fluid analysis of the plunger, in which Figure 6 the plunger represented is a common plunger with a flat end face, Figure 7The representative plunger is a plunger with a head that is a spherically convex plunger. The plunger with a flat end face will push fluid away and spread out to a large extent on both sides when moving at high speed. The position close to the end face of the side of the plunger will generate a large amount of vortex and turbulence, and also cavitation effect, generating a large number of bubbles. These vortexes, turbulence and cavitation bubbles are all useless work. The plunger provided by the application with the spherically convex feature will reduce vortexes, turbulence and cavitation bubbles, reduce these useless work, and improve the performance of the plunger pump.

[0039] Referring to Figure 2 In one example, the top end 210 of the head 200 can be conical. Referring to Figure 3 In another example, the top end 210 of the head 200 can be spherically convex. Of course, the head 200 can also be other configurations including arc surface features. Even, the top end 210 can also be a pyramid, can be a combination of multiple configurations, etc.

[0040] Referring to Figure 3 The head 200 can be inserted into the plunger rod 100. Referring to Figure 4 The head 200 can also be integrally formed with the plunger rod 100. Whether it is inserted or integrally formed, the test data of the working effect is not much different. But in terms of price, in the implementation of the inserted form, the plunger rod 100 can be set as hollow to save materials and cost. In terms of durability, the integrally formed implementation is more solid and has better durability. The corresponding implementation can be selected as needed.

[0041] It should be understood that in the inserted implementation, in addition to the top end 210 with gradually changing cross-sectional area, the head 200 can also include an insertion end 220 for inserting into the plunger rod 100. While in the integrally formed implementation, the head 200 only includes the top end 210.

[0042] In one possible example (not shown in the figure), the head 200 can also include an intermediate part such as a cylindrical intermediate part as a transition section of the top end 210 and the plunger rod 100. In this example, the intermediate part is beyond the plunger rod 100, but does not have the uniform convex feature of gradually changing cross-sectional area.

[0043] Referring to Figures 2 to 4 In the radial direction of the plunger, the radial dimension of the head 200 can be not greater than the radial dimension of the plunger rod 100.

[0044] Referring to Figure 2For the conical head 200, its shape can be specifically defined by feature sizes, such as the protrusion height A, the plunger diameter B. For the spherical protrusion head 200, its shape can be specifically defined by feature sizes, such as the protrusion height A, the plunger diameter B, the spherical radius R. Of course, the present application does not limit the specific sizes thereof.

[0045] In the following, the present application provides a comparative test of the existing plunger and the two protrusion plunger provided by the present application.

[0046] In the following, the present application provides a comparative test of the existing plunger and the two protrusion plunger provided by the present application. Figure 2 The head 200 shown in FIG. 1A is a conical plunger. The "plunger A" is a plunger with a head 200 shown in FIG. 1B, which is a spherical protrusion plunger. Figure 3 The head 200 shown in FIG. 1A is a conical plunger. The "plunger A" is a plunger with a head 200 shown in FIG. 1B, which is a spherical protrusion plunger.

[0047] Test I: In the same background environment, a brand new high-pressure cleaner respectively uses the original plunger, the plunger A and the plunger B for performance test. The results show that, compared with the original plunger with a flat end face, the plunger of the present application has higher cleaning efficiency.

[0048] Test II: In the same background environment, a high-pressure cleaner which has been running for 5 hours respectively uses the original plunger, the plunger A and the plunger B for performance test. The results show that, compared with the original plunger with a flat end face, the plunger of the present application has higher cleaning efficiency, and the efficiency is improved by about 2.25%.

[0049] Test III: In the same background environment, a high-pressure cleaner which has been running for 500 hours respectively uses the original plunger, the plunger A and the plunger B for performance test. The results show that, compared with the original plunger with a flat end face, the plunger of the present application has higher cleaning efficiency, and the efficiency is improved by about 6.5%.

[0050] And test II and test III show that the longer the high-pressure cleaner is used, the more obvious the efficiency improvement effect of the plunger of the present application is.

[0051] Test IV: In the same background environment, the high-pressure cleaner respectively uses the original plunger, the plunger A and the plunger B, and the input power difference is measured. The results show that the present application can reduce the average input power by about 100W, and reduce the power consumption by about 6%.

[0052] The present application also provides a plunger pump, which can include a working chamber and a plunger as described above. The head 200 of the plunger faces the working chamber, and the plunger pump is configured such that when the plunger moves away from the working chamber, the working chamber sucks liquid; when the plunger moves towards the working chamber, the working chamber discharges liquid, and the head 200 of the plunger contacts and pushes the liquid in the working chamber.

[0053] The present application also provides a cleaning machine, which can include a plunger pump as described above.

[0054] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, can also make several improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A plunger for a plunger pump, characterized by The plunger for a plunger pump comprises a plunger rod portion and a head portion connected to the plunger rod portion, the head portion protruding in an axial direction of the plunger rod portion towards a working chamber of the plunger pump, In a direction from the plunger rod portion towards the working chamber, the structure of the head portion protruding from the plunger rod portion comprises a tip portion having a cross-sectional area that gradually decreases.

2. The plunger for a plunger pump according to claim 1, characterized in that The tip portion is rotationally symmetrical about an axis of the plunger for a plunger pump.

3. The plunger of claim 1, wherein The tip portion of the head portion is conical.

4. The plunger of claim 1, wherein, The tip portion of the head portion is a spherical protrusion.

5. The plunger of claim 1, wherein, The head portion comprises an arcuate surface.

6. The plunger of claim 1, wherein, In a radial direction of the plunger for a plunger pump, a radial dimension of the head portion is not greater than a radial dimension of the plunger rod portion.

7. The plunger of claim 1, wherein The head portion is inserted into the plunger rod portion.

8. The plunger of claim 1, wherein, The head portion is integrally formed with the plunger rod portion.

9. A piston pump characterized in that Comprising: The plunger for a plunger pump of any one of claims 1 to 8; a working chamber, the head portion of the plunger for a plunger pump facing the working chamber, and the plunger pump being configured such that the working chamber sucks liquid when the plunger for a plunger pump moves away from the working chamber, the working chamber expels liquid when the plunger for a plunger pump moves towards the working chamber, and the head portion contacts and pushes liquid in the working chamber.

10. A cleaning machine characterized by, Comprising the plunger pump of claim 9.

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