Internal circulation structure for pump and pump

Abstract

The utility model belongs to the technical field of pumps, and provides a pump internal circulation structure and a pump, and the pump internal circulation structure comprises a rotor shaft which is provided with a first end and a second end which extend along a first direction; the at least two stages of impeller assemblies are fixed to the rotor shaft and arranged in the first direction; wherein a liquid inlet is formed in the end face of the second end of the rotor shaft, a liquid outlet is formed in the position, between the at least two stages of impeller assemblies, of the side wall of the rotor shaft, and the liquid inlet extends in the direction of the first end and communicates with the liquid outlet to form a liquid return channel.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pump technical field especially relates to a pump inner circulation structure and pump. BACKGROUND

[0002] Water pump is widely used in the circulation system of life, production and various facilities, and the power loss of water pump is also an important consideration factor, and the volume loss caused by the inner circulation of water pump is one of the important factors affecting the hydraulic efficiency of water pump.

[0003] The inner circulation of the existing pump directly returns to the water inlet of the first stage impeller through the shaft hole, so that the pressure difference of both ends is large, the hydraulic loss generated is sharply increased, and the strong flow rate generated by the inner circulation return water port also affects the flow state at the inlet of the first stage impeller, affects the anti-cavitation performance of the first stage impeller, and further reduces the service life of the pump. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies in the prior art, the utility model aims at providing a pump inner circulation structure, which changes the position of the inner circulation return water port to reduce the flow state at the inlet of the first stage impeller.

[0005] Another object of the utility model is to provide a pump which applies the above pump inner circulation structure, improves the anti-cavitation performance of the first stage impeller of the pump, and improves the service life of the pump.

[0006] A pump inner circulation structure comprises:

[0007] A rotor shaft has a first end and a second end extending in a first direction;

[0008] At least two stage impeller assemblies are fixed to the rotor shaft and arranged in the first direction;

[0009] The end face of the second end of the rotor shaft is provided with a liquid inlet, the side wall of the rotor shaft between the at least two stage impeller assemblies is provided with a liquid outlet, the liquid inlet extends to the first end direction and communicates with the liquid outlet to form a liquid return channel.

[0010] Preferably, a shaft sleeve is arranged between at least one set of adjacent two stage impeller assemblies, the shaft sleeve is sleeved on the rotor shaft, a liquid return outlet is formed on the shaft sleeve, and the liquid return outlet communicates with the liquid outlet.

[0011] Preferably, an inner circulation groove is arranged on the inner wall of the shaft sleeve and communicates with the liquid outlet and the liquid return channel.

[0012] Preferably, the inner circulation groove is an annular groove arranged along the circumference of the inner wall of the shaft sleeve.

[0013] Preferably, the inner circulation groove has a depth dimension of 1 / 3-1 / 2 of the thickness dimension of the shaft sleeve.

[0014] Preferably, the inner circulation groove comprises a plurality of parallelly arranged and communicated grooves arranged along the axial direction of the shaft sleeve.

[0015] Preferably, the shaft sleeve is provided with at least two liquid outlets, which are uniformly distributed along the circumferential direction of the shaft sleeve.

[0016] Preferably, the liquid outlet is any one of a strip-shaped hole, a circular hole, a square hole or an elliptical hole.

[0017] A pump comprising the inner circulation structure for the pump.

[0018] Compared with the prior art, the rotor shaft is provided with at least two impeller assemblies, the side wall of the rotor shaft between the at least two impeller assemblies is provided with a liquid outlet, the liquid outlet is arranged at the end of the rotor shaft, the liquid outlet is arranged at the first-stage impeller assembly, the liquid flow state at the inlet of the first-stage impeller assembly is reduced, the impact of the backflow liquid on the first-stage impeller assembly is reduced, cavitation is reduced, and the service life of the impeller assembly is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 is a sectional view of the pump in the utility model;

[0020] Fig. 2 is a structural view of the shaft sleeve in the utility model;

[0021] Fig. 3 is a sectional view of the shaft sleeve in the utility model.

[0022] Wherein, 1, rotor shaft; 11, liquid outlet; 2, impeller assembly; 3, liquid return channel; 4, impeller chamber; 5, shaft sleeve; 51, liquid return outlet; 52, inner circulation groove. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0026] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0027] It should also be noted that, in the description of this utility model, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0028] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0029] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used to explain the present application, and cannot be understood as a limitation of the present application.

[0030] As Figs. 1-3 shown, the present embodiment provides an inner circulation structure for pump, comprising a rotor shaft 1, and at least two-stage impeller assemblies 2 fixedly installed on the rotor shaft 1, the rotor shaft 1 has a first end and a second end extending along a first direction. The at least two-stage impeller assemblies 2 are arranged along the first direction on the rotor shaft 1, specifically, the impeller assemblies 2 are arranged in sequence and connected with the rotor shaft 1, to ensure that the impeller assemblies 2 rotate synchronously with the rotor shaft 1, and the impeller assemblies 2 will not move along the axial direction of the rotor shaft 1. Wherein, the end face of the second end of the rotor shaft 1 is provided with a liquid inlet, and the side wall of the rotor shaft 1 between the at least two-stage impeller assemblies 2 is provided with a liquid outlet 11, the liquid inlet extends to the first end direction and communicates with the liquid outlet 11 to form a liquid return channel.

[0031] In this embodiment, the rotor shaft 1 is provided with at least two-stage impeller assemblies 2, and the side wall of the rotor shaft 1 between the at least two-stage impeller assemblies 2 is provided with a liquid outlet 11, the liquid outlet 11 is arranged at the first-stage impeller assembly 2 compared with being arranged at the end of the rotor shaft 1, the liquid return to the first-stage impeller assembly 2 can reduce the flow state of the liquid at the inlet of the first-stage impeller assembly 2, and also reduce the cavitation caused by the impact of the return liquid on the first-stage impeller assembly 2, to improve the service life of the impeller assembly 2.

[0032] Preferably, at least one set of adjacent two-stage impeller assemblies 2 is provided with a shaft sleeve 5, the shaft sleeve 5 is sleeved on the rotor shaft 1, and the shaft sleeve 5 is provided with a liquid return outlet 51, the liquid return outlet 51 communicates with the liquid outlet 11.

[0033] The shaft sleeve 5 is installed between the impeller assemblies 2, and the liquid outlet 11 communicating with the liquid return channel 3 and the impeller chamber 4 of the pump is arranged on at least one shaft sleeve 5,

[0034] For the fixed installation mode between the rotor shaft 1 and the impeller assembly 2, a first assembly surface is arranged on the outer periphery of the rotor shaft 1, and a second assembly surface matched with the first assembly surface is arranged on the mounting hole of the impeller assembly 2, to ensure that the impeller assembly 2 will not rotate relative to the rotor shaft 1 after being installed on the rotor shaft 1.

[0035] Preferably, the inner circulation structure of the pump in the embodiment comprises at least two sets of impeller assemblies 2, and the liquid outlet 11 is arranged on the shaft sleeve 5 between the last-stage impeller assembly 2 and the penultimate-stage impeller assembly 2. The inner circulation structure of the pump comprises 2-8 sets of impeller assemblies 2. Preferably, the liquid outlet 11 is one, which is arranged on the shaft sleeve 5 between the last-stage impeller assembly 2 and the penultimate-stage impeller assembly 2.

[0036] In other embodiments, when the inner circulation structure of the pump comprises 1-4 sets of impeller assemblies 2, the number of liquid outlets 11 arranged on the shaft sleeve 5 is not more than the number of shaft sleeves 5. When the inner circulation structure of the pump comprises 5-8 sets of impeller assemblies 2, the number of liquid outlets 11 arranged on the shaft sleeve 5 is 1-4. That is, when the inner circulation structure of the pump comprises 8 sets of impeller assemblies 2, four shaft sleeves 5 are arranged with liquid outlets 11. Preferably, the shaft sleeve 5 between the last five sets of impeller assemblies 2 is arranged with a liquid outlet 11.

[0037] Preferably, the inner wall of the shaft sleeve 5 is provided with an inner circulation groove 52, which is in communication with the liquid outlet 11 and the liquid return channel 3. When the shaft sleeve 5 is assembled, the inner circulation groove 52 is not required to be aligned with the outlet of the liquid return channel 3 on the rotor shaft 1, which facilitates the installation of the inner circulation groove 52. The water in the liquid return channel 3 flows into the inner circulation groove 52 and then flows to the liquid outlet 11 through the inner circulation groove 52, and then enters the chamber of the impeller assembly 2.

[0038] Preferably, the inner circulation groove 52 is an annular groove arranged along the circumference of the inner wall of the shaft sleeve 5. In this embodiment, the shaft sleeve 5 does not need to be considered to be completely aligned with the liquid outlet 11 and the outlet of the liquid return channel during installation, which facilitates the installation of the shaft sleeve 5. At the same time, the arrangement of the inner circulation groove 52 is equivalent to increasing the liquid flow space between the shaft sleeve 5 and the rotor shaft 1, so that the water flow is smoother. In other embodiments, the inner circulation groove 52 can be an arc-shaped groove, and the liquid return channel 3 flows to the liquid outlet 11 of the shaft sleeve 5 through the arc-shaped inner circulation groove 52.

[0039] Preferably, the depth of the inner circulation groove 52 is 1 / 3-1 / 2 of the thickness of the shaft sleeve 5. This arrangement ensures the size of the inner circulation groove 52 while ensuring the structural strength of the shaft sleeve 5.

[0040] Preferably, in order to ensure the structural strength of the shaft sleeve 5 at the inner circulation groove 52, the inner circulation groove 52 comprises a plurality of parallel grooves arranged along the axial direction of the shaft sleeve 5 and in communication with each other, and the spacing between the adjacent two groups of grooves increases the structural strength of the shaft sleeve 5 without increasing the wall thickness of the shaft sleeve 5, and because each groove is in communication with each other, it ensures that the liquid flowing out of the liquid return channel 3 flows smoothly to the liquid outlet 11.

[0041] Preferably, the shaft sleeve 5 is provided with at least two liquid outlets 11, which are uniformly distributed along the circumference of the shaft sleeve 5. By providing multiple liquid outlets 11, the water flow rate through the liquid outlets 11 is increased.

[0042] Preferably, the liquid outlet 11 is any one of a strip-shaped hole, a circular hole, a square hole or an elliptical hole. In this embodiment, the liquid outlet 11 is a strip-shaped hole.

[0043] In this embodiment, a pump is also provided, which comprises the above-mentioned internal circulation structure for a pump, and the pump utilizes the internal circulation structure for a pump to reduce the energy consumption of the pump and increase the service life of the pump.

[0044] Preferably, the pump is a canned pump.

[0045] Obviously, the above-mentioned embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, on the basis of the above-mentioned description, other different forms of changes or variations can also be made. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. An internal circulation structure for a pump, characterized in that: include: A rotor shaft (1) having a first end and a second end extending in a first direction; At least two stages of impeller assemblies (2), wherein the at least two stages of impeller assemblies (2) are fixed to the rotor shaft (1) and arranged along a first direction; A liquid inlet is provided on the end surface of the second end of the rotor shaft (1), and a liquid outlet (11) is provided on the side wall of the rotor shaft (1) between at least two stages of the impeller assemblies (2), wherein the liquid inlet extends toward the first end and is connected to the liquid outlet (11) to form a liquid return channel (3).

2. The internal circulation structure for a pump according to claim 1, characterized in that: A shaft sleeve (5) is provided between at least one set of two adjacent stages of the impeller assemblies (2), the shaft sleeve (5) being sleeved on the rotor shaft (1), and a liquid return outlet (51) being provided on the shaft sleeve (5), the liquid return outlet (51) being in communication with the liquid outlet (11).

3. The internal circulation structure for a pump according to claim 2, characterized in that: An inner circulation groove (52) is provided on the inner wall of the shaft sleeve (5) and is in communication with both the liquid outlet (11) and the liquid return channel (3).

4. The internal circulation structure for a pump according to claim 3, characterized in that: The inner circulation groove (52) is an annular groove arranged along the circumference of the inner wall of the shaft sleeve (5).

5. The internal circulation structure for a pump according to claim 3, characterized in that: The depth dimension of the inner circulation groove (52) is 1 / 3-1 / 2 of the thickness dimension of the shaft sleeve (5).

6. The internal circulation structure for a pump according to claim 3, characterized in that: The inner circulation groove (52) comprises a plurality of parallel and connected grooves arranged along the axial direction of the shaft sleeve (5).

7. The internal circulation structure for a pump according to claim 2, characterized in that: At least two liquid outlets (11) are provided on the shaft sleeve (5), and the liquid outlets (11) are evenly distributed along the circumference of the shaft sleeve (5).

8. The internal circulation structure for a pump according to claim 1 or 2, characterized in that: The liquid outlet (11) is any one of a strip hole, a circular hole, a square hole or an elliptical hole.

9. A pump, characterized in that: The invention comprises the internal circulation structure for a pump according to any one of claims 1 to 8.

Images