Multi-stage pump and impeller wear ring sealing structure thereof

Abstract

The utility model provides a multi-stage pump and an impeller wear ring sealing structure thereof. The impeller wear ring sealing structure comprises a sealing pressing sheet, the sealing pressing cover and the sealing pressing sheet are mounted and matched to form a sealing cavity; the wave-shaped elastic gasket is arranged in the sealing cavity; the floating sealing ring is arranged in the sealing cavity, and the floating sealing ring is arranged on the outer circle of an inlet of the impeller in a sleeving mode; the floating sealing ring is limited between the wave-shaped elastic gasket and the sealing pressing piece. Compared with the prior art, the wave-shaped elastic gasket is used for limiting the position of the floating sealing ring innovatively, axial movement of the floating sealing ring can be prevented in the axial direction, noise caused by contact between the floating sealing ring and the sealing gland is prevented, radial movement of the floating sealing ring can be limited in the radial direction, and the sealing gland is prevented from being damaged. Noise caused by friction between the floating sealing ring and the sealing gland or the outer circle of the impeller inlet is prevented.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of pump, concretely relates to a multistage pump and impeller mouth ring sealing structure thereof. BACKGROUND

[0002] The multistage water pump is the equipment of conveying liquid or making liquid pressure increasing, and the lift of the multistage water pump is mainly formed by the multistage impeller assembly in series on the pump shaft, and each stage of impeller assembly includes a flow guide cylinder, a guide vane and an impeller. In the prior art, in order to reduce internal leakage, an impeller mouth ring sealing structure is installed at the outer circle of the impeller inlet, a dynamic seal is formed between the floating sealing ring and the impeller, the backflow of the liquid in the high-pressure area (the outlet of the impeller) to the low-pressure area (the inlet of the impeller) is prevented, thereby reducing the energy loss, ensuring the water pump to reach the design flow and lift, and improving the efficiency.

[0003] However, the floating sealing ring of the above structure is not fixed in the sealing structure, which causes the axial movement and radial movement of the floating sealing ring in the sealing structure, the floating sealing ring touches and rubs with other components, and the sealing structure produces loud noise and other defects. INNOVATION

[0004] In order to overcome the above technical defects, the utility model provides a multistage pump and impeller mouth ring sealing structure thereof, which can solve the technical problem of noise generated in the working process of the multistage pump in the prior art.

[0005] The utility model is realized according to the following technical scheme:

[0006] The utility model provides an impeller mouth ring sealing structure, which is applied to the outer circle of the impeller inlet of the multistage pump, and comprises:

[0007] A sealing pressing piece;

[0008] A sealing pressing cover which is installed and matched with the sealing pressing piece and forms a sealing cavity;

[0009] A wave-shaped elastic gasket which is arranged in the sealing cavity;

[0010] A floating sealing ring which is arranged in the sealing cavity and is sleeved on the outer circle of the impeller inlet; the floating sealing ring is limited between the wave-shaped elastic gasket and the sealing pressing piece.

[0011] Compared with the prior art, the wave-shaped elastic gasket is used to limit the position of the floating sealing ring, which can prevent the axial movement of the floating sealing ring in the axial direction, prevent the floating sealing ring from touching the sealing pressing cover and generating noise, limit the radial movement of the floating sealing ring in the radial direction, and prevent the floating sealing ring from rubbing with the sealing pressing cover or the outer circle of the impeller inlet and generating noise.

[0012] In one embodiment, the waveform elastic washer includes multiple peaks and multiple troughs, and the multiple peaks and multiple troughs are alternately connected to form a ring-shaped structure;

[0013] The crests protrude toward the sealing gland, and the troughs are recessed toward the floating sealing ring.

[0014] In one embodiment, the crest contacts the sealing gland, and the trough contacts the floating sealing ring.

[0015] In one embodiment, the vertical distance from the crest to the trough is 1.7 mm to 2.5 mm.

[0016] In one embodiment, the radial width of the wave-shaped elastic washer matches the radial width of the floating sealing ring.

[0017] In one embodiment, the wave-shaped elastic washer is made of 12Cr17Ni7 material.

[0018] In one embodiment, the sealing cap and the sealing plate are configured with an interference fit.

[0019] In one embodiment, the impeller inlet ring sealing structure further includes a guide tube, the lower side of the inner wall of the guide tube being connected and fixed to the sealing plate.

[0020] This utility model also provides a multistage pump, which is a vertical multistage pump and includes the impeller inlet ring sealing structure as described above.

[0021] This utility model also provides a multistage pump, which is a horizontal multistage pump and includes the impeller inlet ring sealing structure as described above. Attached Figure Description

[0022] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of the vertical multistage pump of this utility model;

[0024] Figure 2 This is a partial schematic diagram of the vertical multistage pump of this utility model;

[0025] Figure 3 for Figure 2 Enlarged view of A in the middle;

[0026] Figure 4 This is a perspective view of the waveform elastic washer of this utility model;

[0027] Figure 5The side view of the wave-shaped elastic gasket of the utility model;

[0028] Figure 6 The schematic view of the horizontal multi-stage pump of the utility model.

[0029] Mark explanation:

[0030] 1 impeller eye ring seal structure, 110 seal gland, 120 wave-shaped elastic gasket, 121 wave crest, 122 wave trough, 130 floating seal ring, 140 seal pressing piece, 2 flow guide cylinder, 3 vertical multi-stage pump, 4 horizontal multi-stage pump. Specific implementation

[0031] The preferred embodiments of the utility model will be described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are only for the purpose of description and explanation of the utility model, and are not intended to limit the utility model.

[0032] In order to better illustrate the utility model, the utility model will be further described below with reference to the accompanying drawings.

[0033] It should be clear that the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the embodiments of the present application.

[0034] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein means and includes any or all possible combinations of one or more associated listed items.

[0035] The following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. On the contrary, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims. In the description of the present application, it should be understood that the terms "first", "second", "third" and the like are only used to distinguish similar objects, and do not necessarily describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] Furthermore, in the description of the present application, "multiple" refers to two or more, unless otherwise specified. The association relationship of the associated objects described by "and / or" indicates that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0037] Embodiment 1

[0038] In combination Figures 1 to 5 As shown in the drawings, the embodiment provides a impeller ring seal structure 1 applied to the outer circle of the impeller inlet of a multi-stage pump, which comprises: a sealing pressing plate 140; a sealing pressing cover 110 which is installed and matched with the sealing pressing plate 140 and forms a sealing cavity; a wave-shaped elastic gasket 120 which is arranged in the sealing cavity; and a floating seal ring 130 which is arranged in the sealing cavity and is sleeved on the outer circle of the impeller inlet, and the floating seal ring 130 is limited between the wave-shaped elastic gasket 120 and the sealing pressing plate 140.

[0039] Specifically, the floating seal ring 130 is placed on the sealing pressing plate 140, the wave-shaped elastic gasket 120 is placed on the floating seal ring 130, and finally the sealing pressing cover 110 is covered on the sealing pressing plate 140 to form a sealing cavity for accommodating the wave-shaped elastic gasket 120 and the floating seal ring 130; wherein the wave-shaped elastic gasket 120 is elastically deformed under the pressing action of the sealing pressing cover 110, and elastically presses the floating seal ring 130, so that the floating seal ring 130 cannot move up and down in the axial direction, and the floating seal ring 130 cannot touch the sealing pressing cover 110 to produce noise; in addition, in the prior art, because the impeller continuously outputs the water after work from the outlet, the pressure water continuously flows in the cavity, which can cause the floating seal ring 130 to deviate. The wave-shaped elastic gasket 120 of the embodiment presses the floating seal ring 130, and the movement of the floating seal ring 130 in the radial direction is limited, so that the floating seal ring 130 cannot rub with the sealing pressing cover 110 or the outer diameter of the impeller inlet to produce noise.

[0040] Compared with the prior art, the wave-shaped elastic gasket 120 is used to limit the position of the floating seal ring 130, which can prevent the axial movement of the floating seal ring 130 in the axial direction, prevent the floating seal ring 130 from touching the sealing pressing cover 110 to produce noise, and limit the radial movement of the floating seal ring 130 in the radial direction, prevent the floating seal ring 130 from rubbing with the sealing pressing cover 110 or the outer circle of the impeller inlet to produce noise.

[0041] In the embodiment, the wave-shaped elastic gasket 120 comprises a plurality of wave crests 121 and a plurality of wave troughs 122, the plurality of wave crests 121 and the plurality of wave troughs 122 are alternately connected to form a circular ring structure; the wave crests 121 are protrudingly arranged towards the sealing gland 110, and the wave troughs 122 are recessedly arranged towards the floating seal ring 130. Since the wave-shaped elastic gasket 120 comprises a plurality of wave crests 121, even if the side surface of the sealing gland 110 close to the wave-shaped elastic gasket 120 (for example, the lower side surface of the sealing gland 110) is not flat, the sealing gland 110 can also be tightly fixed to the floating seal ring 130 by the wave-shaped elastic gasket 120. In addition, under the condition of reducing noise, the production precision of the sealing gland 110 can be reduced to reduce the production cost.

[0042] Further, the wave crests 121 are in contact with the sealing gland 110, and the wave troughs 122 are in contact with the floating seal ring 130, so as to better tightly press the floating seal ring 130.

[0043] Further, the vertical distance d between the wave crest 121 and the wave trough 122 is 1.7mm-2.5mm, so as to ensure that the floating seal ring 130 can be tightly pressed, and a thinner gasket design can be adopted to reduce the production cost. The wave-shaped elastic gasket 120 has thin thickness, good elasticity, and moderate extrusion to the floating seal ring 130.

[0044] In the embodiment, the radial width of the wave-shaped elastic gasket 120 matches the radial width of the floating seal ring 130; preferably, the radial width of the wave-shaped elastic gasket 120 is the same as the radial width of the floating seal ring 130, so as to better cover the floating seal ring 130.

[0045] In the embodiment, the wave-shaped elastic gasket 120 is made of 12Cr17Ni7 (metastable austenitic stainless steel) material, so that the wave-shaped elastic gasket 120 has high strength, good corrosion resistance and excellent processing performance.

[0046] In the embodiment, the sealing gland 110 is provided in interference fit with the sealing pressing piece 140, so as to better tightly wrap the sealing gland 110 outside the sealing pressing piece 140 to prevent loosening.

[0047] In the embodiment, the impeller ring seal structure 1 further comprises a guide cylinder 2, the lower side surface of the inner wall of the guide cylinder 2 is connected and fixed with the sealing pressing piece 140, and preferably, the sealing pressing piece 140 is butt-welded and fixed on the guide cylinder 2.

[0048] The embodiment also provides a multi-stage pump, which is a vertical multi-stage pump 3 and comprises the impeller port ring sealing structure 1.

[0049] Embodiment 2

[0050] As shown in Figure 6 The embodiment is basically the same as Embodiment 1, except that the embodiment provides a multi-stage pump, which is a horizontal multi-stage pump 4 and comprises the impeller port ring sealing structure 1. It should be noted that, due to the installation mode of the vertical multi-stage pump 3, the floating sealing ring 130 itself generates gravity to reduce the amount of axial movement, so the horizontal multi-stage pump 4 of the embodiment applies the impeller port ring sealing structure 1 of the application, and the noise reduction effect is more obvious.

[0051] According to the disclosure and teaching of the above description, those skilled in the art of the present application can also change and modify the above embodiments. Therefore, the present application is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the present application should fall within the protection scope of the claims of the present application. In addition, although some specific terms are used in the specification, these terms are only for convenience of explanation and do not constitute any limitation on the present application.

Claims

1. A structure of impeller ring seal, which is applied to the outer circle of impeller inlet of a multi-stage pump, characterized in that, It comprises: a sealing pressing piece; a sealing pressing cover which is mounted with the sealing pressing piece and forms a sealing cavity; a wave-shaped elastic gasket which is arranged in the sealing cavity; a floating sealing ring which is arranged in the sealing cavity and is sleeved on the outer circle of the impeller inlet; the floating sealing ring is limited between the wave-shaped elastic gasket and the sealing pressing piece.

2. The impeller eye ring seal structure according to claim 1, wherein: the wave-shaped elastic gasket comprises a plurality of wave crests and a plurality of wave troughs which are alternately connected into a circular ring structure; the wave crests are arranged protruding towards the sealing pressing cover, and the wave troughs are arranged recessed towards the floating sealing ring.

3. The impeller eye ring seal structure according to claim 2, wherein: the wave crests are in contact with the sealing pressing cover, and the wave troughs are in contact with the floating sealing ring.

4. The impeller eye ring seal structure according to claim 2, wherein: the vertical distance from the wave crest to the wave trough is 1.7mm-2.5mm.

5. The impeller eye ring seal structure according to claim 1, wherein: the radial width of the wave-shaped elastic gasket matches the radial width of the floating sealing ring.

6. The impeller eye ring seal structure according to claim 1, wherein: the wave-shaped elastic gasket is made of 12Cr17Ni7 material.

7. The impeller eye ring seal structure according to claim 1, wherein: the sealing pressing cover is arranged in interference fit with the sealing pressing piece.

8. The impeller eye ring seal structure according to claim 1, wherein: the impeller eye ring seal structure further comprises a guide vane which is connected and fixed to the sealing pressing piece on the lower side of the inner wall thereof.

9. A multi-stage pump, which is a vertical multi-stage pump, characterized by comprising: It comprises the impeller eye ring seal structure according to any one of claims 1-8.

10. A multi-stage pump, which is a horizontal multi-stage pump, characterized by comprising: It comprises the impeller eye ring seal structure according to any one of claims 1-8.

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