Wear-resistant assembly for impeller and pump housing, and pump unit having wear-resistant assembly

Abstract

A wear-resistant assembly for an impeller and a pump housing, and a pump unit having the wear-resistant assembly. The wear-resistant assembly is mounted on the pump unit. The pump unit comprises an impeller (2) and a pump housing (3). The wear-resistant assembly comprises a pump housing axial wear-resistant ring (10), an impeller axial wear-resistant ring (11), and an elastic buffer member (16). The impeller axial wear-resistant ring (11) is fixedly mounted at an inlet of the impeller (2), the elastic buffer member (16) completely fits the inner wall of the pump housing (3), and the pump housing axial wear-resistant ring (10) completely fits the elastic buffer member (16). When the pump unit operates, the impeller (2) is subjected to an axial force pointing to a pump head, so that the impeller axial wear-resistant ring (11) moves to the pump housing axial wear-resistant ring (10) and completely fits same to form a pair of friction pairs F1 for dynamic sealing. The wear-resistant assembly has the advantages of preventing liquid in the pump from leaking and reducing friction resistance of the impeller.

Description

Impeller and pump casing wear-resistant assembly and pump unit having the same Technical Field

[0001] The present invention relates to wet-running pump technology, in particular to an impeller and pump casing wear-resistant component and a pump unit having the wear-resistant component. Background Art

[0002] In the wet-running pumps of the heating system, a certain sealing gap is usually left between the impeller inlet and the pump casing to reduce liquid leakage loss, thereby improving the operating efficiency of the pump. However, in order to avoid friction, the gap cannot be set too small, which results in a large amount of flow leaking through this sealing gap and cannot effectively improve the operating efficiency of the pump.

[0003] A prior art search revealed that patent document CN2486751 discloses a pump with an elastic sealing ring, comprising a pump body, impeller, pump cover, and elastic sealing ring. Its characteristics are: the sealing ring is elastically V-shaped or U-shaped. When liquid flows back from the high-pressure area to the low-pressure area within the pump, the sealing ring lip contracts radially, reducing the gap between the impeller and the sealing ring, minimizing leakage losses from the sealing ring, and thus improving pump efficiency. Although this solution reduces the size of the sealing gap, the friction between the sealing ring and the impeller increases with increasing pressure, causing the pump to lose efficiency and wear the impeller and sealing ring. Severe wear can lead to loss of sealing effectiveness.

[0004] Patent document CN110088480B discloses a sealing method for a centrifugal pump, which reduces the contact area with the impeller by reducing the concave and convex and elastic structure of the sealing ring, thereby achieving the purpose of reducing leakage. However, the sealing ring also has the problems of leakage loss and unavoidable influence of friction. In addition, the structure of the sealing ring is complex, resulting in high manufacturing costs.

[0005] Therefore, in order to solve the above-mentioned problems in the prior art, it is urgent to propose a new type of pump unit structure to improve the operating efficiency of the pump unit by preventing liquid leakage in the pump as much as possible and reducing friction resistance.

[0006] Summary of the Invention

[0007] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide an impeller and pump casing wear-resistant assembly and a pump unit having the wear-resistant assembly.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] According to one aspect of the present invention, an impeller and pump casing wear-resistant assembly is provided, wherein the wear-resistant assembly is mounted on a pump unit, wherein the pump unit includes an impeller and a pump casing, and the wear-resistant assembly includes a pump casing axial wear-resistant ring, an impeller axial wear-resistant ring, and an elastic buffer. The impeller axial wear-resistant ring is fixedly mounted at the inlet of the impeller, and the elastic buffer completely fits the inner wall of the pump casing, and the pump casing axial wear-resistant ring completely fits the elastic buffer.

[0010] When the pump unit is running, the impeller is subjected to an axial force directed toward the pump head, so that the impeller axial wear ring is completely fitted toward the pump housing axial wear ring, forming a pair of friction pairs F1 for dynamic sealing.

[0011] As a preferred technical solution, the inner wall of the pump housing is provided with a first fitting structure adapted to the elastic buffer.

[0012] As a preferred technical solution, the elastic buffer is provided with a second fitting structure adapted to the axial wear-resistant ring of the pump housing.

[0013] As a preferred technical solution, the pump casing axial wear-resistant ring, the impeller axial wear-resistant ring and the elastic buffer are coaxially arranged.

[0014] As a preferred technical solution, when the pump unit is running, the elastic buffer member adaptively deforms to reduce the impact force at the friction pair F1.

[0015] As a preferred technical solution, the pump housing axial wear-resistant ring is a wear-resistant ring made of wear-resistant material cemented carbide or ceramic.

[0016] As a preferred technical solution, the impeller axial wear-resistant ring is a wear-resistant ring made of wear-resistant material cemented carbide or ceramic.

[0017] As a preferred technical solution, the elastic buffer is a buffer made of superelastic rubber.

[0018] According to another aspect of the present invention, a pump unit having an impeller and pump casing wear-resistant assembly is provided, the pump unit comprising a shielded motor, an impeller and a pump casing, and the pump unit further comprising the impeller and pump casing wear-resistant assembly according to any one of claims 1-8.

[0019] As a preferred technical solution, when the pump unit is in operation, the complete fit between the pump casing axial wear-resistant ring and the impeller axial wear-resistant ring is used to limit the axial movement of the rotating shaft.

[0020] Compared with the prior art, the present invention has the following technical effects:

[0021] 1. The present invention proposes a wear-resistant component, which forms a dynamic sealing structure during the operation of the pump to prevent liquid leakage inside the pump, thereby improving the operating efficiency of the pump unit.

[0022] 2. The wear-resistant assembly includes two wear-resistant rings installed on the pump casing and impeller respectively, and both are made of smooth wear-resistant materials, which can effectively reduce the friction resistance between the impeller and the pump casing, further improve the operating efficiency of the pump unit, and extend the life of the pump unit.

[0023] 3. The wear-resistant assembly also includes an elastic buffer that fits tightly against the inner wall of the impeller chamber and is installed in front of the axial wear-resistant ring of the pump casing. It is used to buffer the impact force when the impeller axial wear-resistant ring is in contact, which is beneficial to the smooth operation of the pump unit, further extends the service life of the pump unit, and reduces the later maintenance cost of the pump unit to a certain extent.

[0024] 4. The wear-resistant component proposed in the present invention is installed in the gap between the pump casing and the impeller, and can serve as an axial limiting part to replace the axial thrust bearing to play a limiting role on the rotating shaft, which is conducive to the simplification of the pump unit structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic diagram of a pump unit embodiment of the present invention;

[0026] FIG2 is a partial enlarged view of the structure at location I in FIG1 .

[0027] Among them, 1 is the rotating shaft, 2 is the impeller, 3 is the pump housing, 4 is the stator, 5 is the rotor, 6 is the stator housing, 7 is the shielding sleeve, 8 is the bearing bracket, 9 is the sliding bearing, 10 is the axial wear-resistant ring of the pump housing, 11 is the axial wear-resistant ring of the impeller, 12 is the suction port, 13 is the discharge port, 14 is the low-pressure chamber, 15 is the high-pressure chamber, 16 is the elastic buffer, and F1 is the friction pair. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0029] Example 1

[0030] As shown in Figure 2, the impeller and pump casing wear-resistant components of this embodiment are installed on the pump unit, which includes an impeller 2 and a pump casing 3. The wear-resistant component includes a pump casing axial wear-resistant ring 10, an impeller axial wear-resistant ring 11 and an elastic buffer 16 coaxially arranged in the gap between the impeller 2 and the pump casing 3. A groove is provided in the impeller chamber of the pump casing 3, and the elastic buffer 16 is fixedly installed in the groove on the inner wall of the impeller chamber without gap; a groove is provided on the elastic buffer 16, and the pump casing axial wear-resistant ring 10 is fixedly installed in the groove on the elastic buffer 16 without gap, and the impeller axial wear-resistant ring 11 is fixedly installed on the outer contour of the blade of the impeller 2 near the pump head without gap. When the pump unit is running, the impeller 2 is subjected to an axial force directed toward the pump head, so that the impeller axial wear-resistant ring 11 is completely fitted onto the contact surface with the axial wear-resistant ring 10 of the pump casing, forming not only a pair of friction pairs F1 but also a dynamic sealing structure to prevent liquid leakage in the pump, thereby improving the operating efficiency of the pump.

[0031] Since the pump housing axial wear-resistant ring 10 and the impeller axial wear-resistant ring 11 are made of wear-resistant materials such as cemented carbide or ceramics, which are smooth and wear-resistant, they can reduce the friction resistance at the friction pair F1 and increase the service life of the pump. The elastic buffer 16 is made of superelastic rubber. When the pump is running, the impeller axial wear-resistant ring 11 is pressed against the pump housing axial wear-resistant ring 10, causing the elastic buffer 16 to deform accordingly. This deformation cushions the impact force at the friction pair F1, which is beneficial to the smooth operation of the pump and reduces the maintenance cost of the pump unit to a certain extent. At the same time, the use of this wear-resistant component has the effect of limiting the axial displacement of the rotating shaft 1 and the axial parts fixedly installed on the rotating shaft 1 during the operation of the pump. Therefore, there is no need to install an additional axial thrust bearing on the shaft, which is beneficial to the simplification of the pump unit structure.

[0032] Example 2

[0033] As shown in FIG1 , this embodiment also provides a pump unit having an impeller and a pump housing wear-resistant assembly, comprising a shielded motor, an impeller 2, a pump housing 3, and bearings, wherein the shielded motor comprises a rotating shaft 1, a stator 4, a rotor 5, a stator housing 6, and a shielding sleeve 7; the pump housing 3 comprises an impeller chamber, a liquid suction port 11, and a liquid discharge port 12; the impeller 2 is placed in the impeller chamber; the bearing assembly comprises a bearing bracket 8 and a sliding bearing 9; the impeller 2, the sliding bearing 9, and the rotor 5 are sequentially mounted on the rotating shaft 1 from the pump head to the pump tail. When the pump unit is running, the rotor 5 drives the impeller 2 on the rotating shaft 1 to rotate, and the centrifugal force generated causes the areas in the impeller chamber connected to the suction port 12 and the discharge port 13 to form a low-pressure chamber 14 and a high-pressure chamber 15, respectively.

[0034] The pump unit of this embodiment further includes the impeller and pump casing wear-resistant components described in Example 1.

[0035] The positive progressive effect of this embodiment is that the present invention solves the problem of reduced pump efficiency caused by internal leakage in conventional circulation pumps. The use of a gapless seal made of wear-resistant material can improve the efficiency of the pump and extend the life of the pump. When the pump life becomes longer, the safe operation of the pump is guaranteed, and the maintenance cost of the pump unit is reduced.

[0036] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. An impeller and pump housing wear-resistant assembly, the wear-resistant assembly being mounted on a pump unit, the pump unit comprising an impeller (2) and a pump housing (3), characterized in that: The wear-resistant assembly comprises a pump casing axial wear-resistant ring (10), an impeller axial wear-resistant ring (11) and an elastic buffer (16); the impeller axial wear-resistant ring (11) is fixedly mounted at the inlet of the impeller (2); the elastic buffer (16) is completely fitted to the inner wall of the pump casing (3); and the pump casing axial wear-resistant ring (10) is completely fitted to the elastic buffer (16); When the pump unit is running, the impeller (2) is subjected to an axial force directed toward the pump head, so that the impeller axial wear-resistant ring (11) is completely fitted toward the pump housing axial wear-resistant ring (10), forming a pair of friction pairs F1 for dynamic sealing.

2. The impeller and pump casing wear-resistant assembly according to claim 1, characterized in that: The inner wall of the pump housing (3) is provided with a first fitting structure adapted to the elastic buffer (16).

3. The impeller and pump casing wear-resistant assembly according to claim 1, characterized in that: The elastic buffer (16) is provided with a second fitting structure adapted to the axial wear-resistant ring (10) of the pump housing.

4. The impeller and pump casing wear-resistant assembly according to claim 1, characterized in that: The pump casing axial wear-resistant ring (10), the impeller axial wear-resistant ring (11) and the elastic buffer (16) are coaxially arranged.

5. The impeller and pump casing wear-resistant assembly according to claim 1, characterized in that: When the pump unit is running, the elastic buffer (16) deforms adaptively to reduce the impact force at the friction pair F1.

6. The impeller and pump casing wear-resistant assembly according to claim 1, characterized in that: The pump housing axial wear-resistant ring (10) is a wear-resistant ring made of wear-resistant material hard alloy or ceramic.

7. The impeller and pump casing wear-resistant assembly according to claim 1, characterized in that: The impeller axial wear-resistant ring (11) is a wear-resistant ring made of wear-resistant material hard alloy or ceramic.

8. The impeller and pump casing wear-resistant assembly according to claim 1, characterized in that: The elastic buffer (16) is a buffer made of superelastic rubber.

9. A pump unit having an impeller and a pump housing wear-resistant assembly, the pump unit comprising a canned motor, an impeller (2) and a pump housing (3), characterized in that: The pump unit also includes the impeller and pump casing wear-resistant assembly as described in any one of claims 1-8.

10. A pump unit having an impeller and a pump casing wear-resistant assembly according to claim 9, characterized in that: When the pump unit is in operation, the complete fit between the pump housing axial wear-resistant ring (10) and the impeller axial wear-resistant ring (11) is used to limit the axial movement of the rotating shaft (1).

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