Connecting structure of pump shaft and impeller

Abstract

The invention relates to a connecting structure of a pump shaft and an impeller. The connecting structure comprises the pump shaft and the impeller. A driving disc body is connected to the pump shaft, first blades are arranged at one end of the driving disc body, and a protruding part is arranged at the other end of the driving disc body. The impeller is connected with the pump shaft through a first sliding bearing, and the first sliding bearing is in clearance fit with the pump shaft; a driven disc body is connected to the impeller, a containing cavity is formed in the driven disc body, second blades are arranged on the top face of the containing cavity, and concave parts corresponding to the protruding parts are arranged on the bottom face of the containing cavity; wherein the driving disc body is located in the containing cavity, the second blades are all located above the driving disc body, the concave parts are all located below the driving disc body, and the protruding parts are used for being connected with the corresponding concave parts in an inserted mode. The self-generating phenomenon of the shield pump can be effectively avoided, so that the problem of equipment loss caused by self-generating of the shield pump is effectively avoided, and the service life of the water pump is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of water pumps, and in particular to a connection structure between a pump shaft and an impeller. Background Art

[0002] The circulating water pump in the heat pump water circulation product generally adopts a shielded pump, in which the impeller and the pump shaft are generally directly fixed together through an interference fit. In normal use, the impeller is driven to rotate by the pump shaft. However, before the heat pump water circulation product is used for the first time, water needs to be injected into the closed pipeline. During the water injection process, the pump shaft of the shielded pump should be kept stationary to prevent the water pump from entering the generator mode. However, in actual use, the injected water flow enters the shielded pump and drives the impeller to rotate, and then drives the pump shaft to rotate, thereby causing the shielded pump to generate electricity. Moreover, when the water flow speed is too fast, the impeller rotates too fast, and the voltage generated may cause damage to the built-in driver chip of the shielded pump, thereby affecting the service life of the water pump.

[0003] Therefore, the existing connection structure between the impeller and the pump shaft cannot effectively avoid the self-generation phenomenon of the canned motor pump, which will shorten the service life of the canned motor pump. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the connection structure between the impeller and the pump shaft in the prior art cannot effectively avoid the self-generation of the canned pump.

[0005] In order to solve the above technical problems, the present invention provides a connection structure between a pump shaft and an impeller, comprising:

[0006] A pump shaft, the pump shaft is connected to a driving disc, one end of the driving disc is provided with a first blade, and the other end is provided with a protrusion;

[0007] An impeller, wherein the impeller is connected to the pump shaft via a first sliding bearing, and a clearance fit is adopted between the first sliding bearing and the pump shaft; a driven disc body is connected to the impeller, and an accommodating cavity is formed inside the driven disc body, and a second blade is arranged on the top surface of the accommodating cavity, and a recessed portion corresponding to the raised portion is arranged on the bottom surface;

[0008] The active disk body is located in the accommodating cavity, the second blades are located above the active disk body, the recessed parts are located below the active disk body, and the protruding parts are used to be plugged into the corresponding recessed parts.

[0009] In one embodiment of the present invention, the driven disk body includes a first disk body portion and a second disk body portion connected in sequence, the accommodating cavity is formed between the first disk body portion and the second disk body portion, the recessed portion is arranged on the end surface of the first disk body portion facing the second disk body portion, and the second blade is arranged on the end surface of the second disk body portion facing the first disk body portion.

[0010] In one embodiment of the present invention, a guiding slope is provided on the side wall of the recessed portion.

[0011] In one embodiment of the present invention, an annular protrusion is provided on the outer wall of the pump shaft, and the active disc body is sleeved on the annular protrusion.

[0012] In one embodiment of the present invention, both the first blade and the second blade are arc-shaped blades.

[0013] In one embodiment of the present invention, the driven disc body is connected to the pump shaft via a second sliding bearing, and a clearance fit is adopted between the second sliding bearing and the pump shaft.

[0014] In one embodiment of the present invention, the impeller includes a main body, which is connected to the pump shaft through a first sliding bearing, one end of the main body is connected to the driven disk body, and the other end is provided with a liquid inlet, and the main body is provided with main blades.

[0015] In one embodiment of the present invention, a plurality of second blades distributed in the circumferential direction are disposed on the top surface of the accommodating cavity, and a plurality of first blades distributed in the circumferential direction are disposed on the active disk body.

[0016] In one embodiment of the present invention, the number of the second blades is greater than the number of the first blades.

[0017] In one embodiment of the present invention, a plurality of circumferentially distributed protrusions are disposed on the active disk body, and the protrusions correspond to the recessed portions one by one.

[0018] The above technical solution of the present invention has the following advantages compared with the prior art:

[0019] The pump shaft and the connection structure with the impeller described in the present invention can effectively prevent the canned pump from generating self-generation, thereby effectively avoiding the problem of equipment loss caused by the canned pump generating self-generation and ensuring the service life of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0021] Figure 1is a schematic diagram of the connection structure between the pump shaft and the impeller of the present invention;

[0022] Figure 2 yes Figure 1 An exploded view of the structure shown;

[0023] Figure 3 yes Figure 1 a cross-sectional view of the structure shown;

[0024] Figure 4 yes Figure 1 A three-dimensional cross-sectional view of the structure shown (the raised portion and the corresponding recessed portion are in a separated state);

[0025] Figure 5 yes Figure 1 A three-dimensional cross-sectional view of the structure shown (the raised portion and the corresponding recessed portion are in an inserted state);

[0026] Figure 6 yes Figure 2 A schematic diagram of the structure of the active disk at one angle;

[0027] Figure 7 yes Figure 2 A schematic diagram of the structure of the active disk from another angle;

[0028] Figure 8 It is a structural schematic diagram of the second disc body portion in the driven disc body;

[0029] Fig. 9 It is a schematic diagram of the structure of the first disc body part in the driven disc body;

[0030] Explanation of the reference numerals in the specification: 1. pump shaft; 11. annular protrusion; 2. impeller; 21. main body; 211. liquid inlet; 212. main blades; 22. driven disk; 221. first disk; 2211. recessed portion; 22111. guide slope; 222. second disk; 2221. second blade; 223. accommodating chamber; 3. active disk; 31. first blade; 32. protrusion; 4. first sliding bearing; 5. second sliding bearing. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0032] Reference Figure 1-Figure 5 As shown, this embodiment discloses a connection structure between a pump shaft and an impeller, comprising a pump shaft 1 and an impeller 2;

[0033] The pump shaft 1 is connected to a driving disc 3. Figure 6-Figure 7As shown, a first blade 31 is provided at one end of the active disc body 3, and a protrusion 32 is provided at the other end; wherein the pump shaft 1 and the active disc body 3 are fixed together, and the two always rotate together;

[0034] The impeller 2 is connected to the pump shaft 1 through the first sliding bearing 4. A clearance fit is adopted between the first sliding bearing 4 and the pump shaft 1, so that the impeller 2 can move linearly in a small range along the pump shaft 1.

[0035] The impeller 2 is connected to a driven disc 22, and the two are fixed together and always move synchronously; a receiving cavity 223 is formed inside the driven disc 22, and a second blade 2221 is arranged on the top surface of the receiving cavity 223, and a recessed portion 2211 corresponding to the raised portion 32 is arranged on the bottom surface;

[0036] The active disk body 3 is located in the accommodating cavity 223 , the second blades 2221 are located above the active disk body 3 , the recessed portions 2211 are located below the active disk body 3 , and the protrusions 32 are used to be plugged into the corresponding recessed portions 2211 .

[0037] In the above structure, there are two states between the active disk body 3 and the driven disk body 22. One state is that the protrusion 32 and the corresponding recessed portion 2211 are plugged together (such as Figure 5 As shown), the active disc body 3 and the driven disc body 22 are directly connected. At this time, the active disc body 3 directly drives the driven disc body 22 to rotate, thereby realizing the rotation of the impeller 2. Another state is that there is a certain gap between the active disc body 3 and the driven disc body 22 (as shown in FIG. Figure 4 As shown), the protrusion 32 and the corresponding recessed portion 2211 are in a mutually disengaged state. At this time, the rotation of the impeller 2 will not drive the active disk to rotate, and the pump shaft 1 is also in a stationary state accordingly.

[0038] Furthermore, the impeller 2 includes a main body 21 , which is connected to the pump shaft 1 via a first sliding bearing 4 , one end of the main body 21 is connected to the driven disc 22 , and the other end is provided with a liquid inlet 211 , and main blades 212 are provided on the main body 21 .

[0039] When the above structure is working, liquid-water is injected into the accommodating chamber 223 in advance. When the water pump (shielded pump) is powered on and started, the pump shaft 1 drives the active disk 3 to rotate, and the first blade 31 on the active disk 3 pushes the liquid in the accommodating chamber 223 to rotate around the axis. The liquid rushes to the top of the accommodating chamber 223 by kinetic energy and acts on the second blade 2221, thereby driving the driven disk 22 and the impeller 2 where it is located to rotate as a whole. The rotation of the impeller 2 drives the external liquid to flow, such as Figure 3 As shown ( Figure 3The direction of the arrow in the middle is the direction of water flow), the flowing external liquid enters the main body 21 from the liquid inlet 211 and is diffused and discharged to the surroundings through the main body blades 212. At this time, negative pressure is formed at the liquid inlet 211. At this time, the pressure below the main body 21 is greater than the pressure at the liquid inlet 211, thereby driving the impeller 2 (including the main body 21 and the driven disc 22) to move upward relative to the pump shaft 1 as a whole. During the upward movement, the protrusion 32 on the active disc 3 will be inserted into the corresponding pit on the bottom surface of the driven disc 22, so that the power transmission between the two discs is changed from liquid transmission to direct rigid connection drive; when the water pump is powered off, due to the inertial impact of the external water flow, the impeller 2 drops, and the protrusion 32 and the corresponding recessed part 2211 are separated;

[0040] When the water pump is powered off and water is injected, water flows through the surface and interior of the impeller 2, wherein the water flowing through the interior will enter the cavity where the main impeller 2 of the main body 21 is located, and at the same time, part of the water flows into the accommodating cavity 223 through the gap between the first sliding bearing 4 and the pump shaft 1 to realize the injection of liquid into the accommodating cavity 223, and the internal water flow will drive the main blades 212 to rotate, thereby causing the impeller 2 to rotate, and the external water flow pressure forces the impeller 2 as a whole to always be in the lowest position, the driven disc 22 has no contact with the active disc 3, the raised portion 32 and the corresponding recessed portion 2211 are in a disengaged state, and at this time, only the impeller 2 rotates, and the active disc 3 and the pump shaft 1 do not rotate.

[0041] In one embodiment, if Figure 3 As shown, the driven disc body 22 includes a first disc body portion 221 and a second disc body portion 222 connected in sequence, and a receiving cavity 223 is formed between the first disc body portion 221 and the second disc body portion 222. Fig. 9 As shown, a recessed portion 2211 is provided on the end surface of the first plate body portion 221 facing the second plate body portion 222. Figure 8 As shown, a second blade 2221 is provided on the end surface of the second plate body portion 222 facing the first plate body portion 221 .

[0042] The first plate body 221 and the second plate body 222 may be fixed by welding, for example, ultrasonic welding.

[0043] In one embodiment, a guiding slope 22111 is disposed on the side wall of the recessed portion 2211 , so that the protruding portion 32 can smoothly enter the recessed portion 2211 .

[0044] Specifically, a guide slope 22111 can be set on a single side wall of the recessed portion 2211. The active disk body 3 and the driven disk body 22 are combined during the rotation process. The above-mentioned single-sided guide slope 22111 can effectively prevent the protrusion 32 on the active disk body 3 from slipping out of the recessed portion 2211 during the rotation process, thereby causing a combination failure.

[0045] In one embodiment, an annular protrusion 11 is provided on the outer wall of the pump shaft 1, and the active disc body 3 is sleeved on the annular protrusion 11. Furthermore, an interference fit is adopted between the active disc body 3 and the annular protrusion 11.

[0046] The annular protrusion 11 can also limit the first sliding bearing 4, thereby limiting the up and down movement distance of the impeller 2.

[0047] In one embodiment, the first blade 31 and the second blade 2221 are both arc-shaped blades.

[0048] Furthermore, the first blades 31 are bent radially backward on the active disc body 3 , and the second blades 2221 are bent radially forward on the driven disc body 22 .

[0049] In one embodiment, the driven disc body 22 is connected to the pump shaft 1 via the second sliding bearing 5 , and a clearance fit is adopted between the second sliding bearing 5 and the pump shaft 1 to better ensure the sliding stability between the impeller 2 and the pump shaft 1 .

[0050] Furthermore, both the first sliding bearing 4 and the second sliding bearing 5 are ceramic bearings.

[0051] In one embodiment, a plurality of second blades 2221 distributed in the circumferential direction are disposed on the top surface of the accommodating cavity 223 , and a plurality of first blades 31 distributed in the circumferential direction are disposed on the active disk body 3 .

[0052] Further, the number of the second blades 2221 is greater than the number of the first blades 31 to avoid resonance.

[0053] In one embodiment, a plurality of circumferentially distributed protrusions 32 are provided on the active disk body 3 , and the protrusions 32 correspond to the recesses 2211 one by one, so as to better ensure the stability when the active disk body 3 and the passive disk body are directly connected.

[0054] The pump shaft and the connection structure with the impeller in the above-mentioned embodiment can drive the impeller 2 to rotate through the pump shaft 1, while the impeller 2 cannot drive the pump shaft 1 to rotate, thereby effectively avoiding the water pump (shielded pump) from accidentally starting during the power-off water injection process, thereby effectively avoiding the problem of equipment loss caused by accidentally starting the water pump and ensuring the service life of the water pump.

[0055] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A connection structure between a pump shaft and an impeller, characterized in that: include, A pump shaft, the pump shaft is connected to a driving disc, one end of the driving disc is provided with a first blade, and the other end is provided with a protrusion; An impeller, wherein the impeller is connected to the pump shaft via a first sliding bearing, and a clearance fit is adopted between the first sliding bearing and the pump shaft; a driven disc body is connected to the impeller, and an accommodating cavity is formed inside the driven disc body, and a second blade is arranged on the top surface of the accommodating cavity, and a recessed portion corresponding to the raised portion is arranged on the bottom surface; The active disk body is located in the accommodating cavity, the second blades are located above the active disk body, the recessed parts are located below the active disk body, and the protruding parts are used to be plugged into the corresponding recessed parts.

2. The connection structure between the pump shaft and the impeller according to claim 1, characterized in that: The driven disk body includes a first disk body part and a second disk body part connected in sequence, the accommodating cavity is formed between the first disk body part and the second disk body part, the recessed part is arranged on the end surface of the first disk body part facing the second disk body part, and the second blade is arranged on the end surface of the second disk body part facing the first disk body part.

3. The connection structure between the pump shaft and the impeller according to claim 1, characterized in that: A guiding inclined surface is arranged on the side wall of the recessed portion.

4. The connection structure between the pump shaft and the impeller according to claim 1, characterized in that: An annular protrusion is arranged on the outer wall of the pump shaft, and the active disc body is sleeved on the annular protrusion.

5. The connection structure between the pump shaft and the impeller according to claim 1, characterized in that: The first blade and the second blade are both arc-shaped blades.

6. The connection structure between the pump shaft and the impeller according to claim 1, characterized in that: The driven disc body is connected to the pump shaft via a second sliding bearing, and a clearance fit is adopted between the second sliding bearing and the pump shaft.

7. The connection structure between the pump shaft and the impeller according to claim 1, characterized in that: The impeller comprises a main body, which is connected to the pump shaft via a first sliding bearing, one end of the main body is connected to the driven disc body, and the other end is provided with a liquid inlet, and main blades are provided on the main body.

8. The connection structure between the pump shaft and the impeller according to claim 1, characterized in that: A plurality of second blades distributed in the circumferential direction are arranged on the top surface of the accommodating cavity, and a plurality of first blades distributed in the circumferential direction are arranged on the active disc body.

9. The connection structure between the pump shaft and the impeller according to claim 8, characterized in that: The number of the second blades is greater than the number of the first blades.

10. The connection structure between the pump shaft and the impeller according to claim 1, characterized in that: The active disk body is provided with a plurality of convex parts distributed in the circumferential direction, and the convex parts correspond to the concave parts one by one.

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