Shaftless multistage pump structure

Abstract

The invention belongs to the field of pump body structures, and discloses a shaftless multi-stage pump structure which comprises a plurality of pump units and a driving unit, the pump units are axially connected, and in any two adjacent pump units, a suction inlet of the rear pump unit communicates with a discharge outlet of the front pump unit; the pump unit comprises an impeller and a supporting piece used for carrying out rotary supporting on the impeller. The driving unit comprises a magnetic rotor connected to the impeller and a winding connected to the supporting piece and corresponding to the magnetic rotor, and the winding is used for driving the magnetic rotor to drive the impeller to rotate under the action of an electric signal.

Description

Technical Field

[0001] The present application belongs to the field of pump body structures, and in particular to a shaftless multi-stage pump structure. Background Art

[0002] Multistage pumps, with their unique multistage impeller structure, can transport fluids from low-pressure areas to high-pressure areas by increasing pressure step by step. Therefore, they play a vital role in many fields such as industrial production, municipal water supply, petrochemicals, and agricultural irrigation. Figure 7 As shown, the impellers 102 of each stage are all installed on the same main shaft 115 and driven by the same motor, so the speed of the impellers 102 of each stage is the same. However, due to the influence of hydraulic pressure, the pumped fluid cannot be guaranteed to operate in the optimal operating point area after being pressurized by the impellers of each stage, resulting in poor operating efficiency of the pump. At the same time, due to the long length of the shaft and the large deflection of the rotor, it may cause large pressure pulsation, increased vibration and noise, etc. Therefore, it is necessary to solve the above technical problems. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a shaftless multi-stage pump structure to solve the technical problem of poor operating efficiency of multi-stage pumps in the prior art.

[0004] To achieve the above purpose, the technical solution adopted in this application is: to provide a shaftless multi-stage pump structure, including: The pump unit is axially connected and provided in multiple groups, and the suction port of the latter pump unit in any two adjacent pump units is connected with the discharge port of the former pump unit; the pump unit includes an impeller and a support member for rotatably supporting the impeller; The driving unit comprises a magnetic rotor connected to the impeller and a winding connected to the support and corresponding to the magnetic rotor. The winding is used to drive the magnetic rotor to rotate the impeller under the action of an electrical signal.

[0005] Optionally, the support member includes a shell, a guide body and a stage partition plate, and the shell, the guide body and the stage partition plate form a flow channel; Both ends of the impeller are extended along their own axial direction to form extension steps, and the extension steps are used to be rotatably connected to the guide body and the stage partition plate respectively; The flow passage is used to connect the discharge port of the impeller of the previous stage and the suction port of the impeller of the next stage.

[0006] Optionally, the guide body is fixedly installed in the shell, and the stage partition is connected between two adjacent shells or is integrally formed with the shell; the extended step located at one end of the impeller suction port in two adjacent pump units forms a rotational friction pair with the stage partition of the previous stage pump unit, and the extended step located at one end of the impeller discharge port forms a rotational friction pair with the guide body.

[0007] Optionally, the flow guide body is integrally formed with the shell, the stage partition is connected between two adjacent shells, the extended step located at one end of the impeller suction port in two adjacent pump units forms a rotational friction pair with the stage partition, and the extended step located at one end of the impeller discharge port forms a rotational friction pair with the flow guide body.

[0008] Optionally, the winding is arranged on the body conductor and matched with the outer circumferential surface of the magnetic rotor.

[0009] Optionally, the winding is arranged on the interstage plate and matched with the end face of the magnetic rotor.

[0010] Optionally, the pump unit further comprises a guide body inlet ring and a stage baffle inlet ring respectively coaxial with the impeller; The guide body inlet ring is gasketed between the guide body and the extended step at one end of the impeller discharge port, and the stage partition plate inlet ring is gasketed between the stage partition plate and the extended step at one end of the impeller suction port.

[0011] Optionally, the shaftless multi-stage pump structure further includes a control system, which is electrically connected to the winding and is used to control the impeller rotation speed of each of the pump units.

[0012] Optionally, a cavity is provided on the guide body, the cavity is located at an end away from the impeller suction port, a balancing hole is provided on the bottom wall of the cavity, and the cavity and the balancing hole are used to balance the axial force of the impeller.

[0013] The beneficial effect of the shaftless multi-stage pump structure provided by the present application is that, compared with the prior art, a plurality of axially connected groups of pump units are arranged in the shaftless multi-stage pump structure provided by the present application, and each group of pump units is a stage, thereby forming a multi-stage booster pumping structure. Since the impeller and support of each stage are respectively installed with corresponding magnetic rotors and windings, the control system connected to the winding can drive the impellers of each stage to rotate relative to the support at different speeds through each winding and magnetic rotor. In this way, the impellers of each stage can be better adapted to the characteristics of the pumped fluid, so that the impellers of each stage can be guaranteed to operate in the optimal operating point area, thereby fully improving the overall pumping efficiency of the shaftless multi-stage pump structure in the present application, which is far superior to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 A schematic diagram of the local structure of the shaftless multi-stage pump structure provided in the embodiment of the present application Figure 1 ; Figure 2 A schematic diagram of the local structure of the shaftless multi-stage pump structure provided in the embodiment of the present application Figure 2 ; Figure 3 A schematic diagram of the local structure of the shaftless multi-stage pump structure provided in the embodiment of the present application Figure 3 ; Figure 4 A schematic diagram of the local structure of the shaftless multi-stage pump structure provided in the embodiment of the present application Figure 4 ; Figure 5 A schematic diagram of the local structure of the shaftless multi-stage pump structure provided in the embodiment of the present application Figure 5 ; Figure 6 A schematic diagram of the local structure of the shaftless multi-stage pump structure provided in the embodiment of the present application Figure 6 ; Figure 7 It is a schematic diagram of the structure of a multi-stage pump in the prior art.

[0016] Among them, the figure numerals are: 101, casing; 102, impeller; 103, support; 104, magnetic rotor; 105, winding; 106, control system; 107, extension step; 108, flow guide inlet ring; 109, stage partition inlet ring; 110, stage partition; 111, flow channel; 112, balance hole; 113, flow guide; 114, cavity; 115, main shaft. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0019] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application 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 should not be understood as a limitation on the present application.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0021] Please also read Figures 1 to 4 Now, a shaftless multistage pump structure provided in the embodiment of the present application is described. The shaftless multistage pump structure comprises: a pump unit and a drive unit, wherein: The pump units are axially connected in multiple groups, and the suction port of the latter pump unit in any two adjacent pump units is connected to the discharge port of the former pump unit; the pump unit includes an impeller 102 and a support member 103 for rotatably supporting the impeller 102; The driving unit includes a magnetic rotor 104 connected to the impeller 102 and a winding 105 connected to the support 103 and corresponding to the magnetic rotor 104. The winding 105 is used to drive the magnetic rotor 104 to drive the impeller 102 to rotate under the action of an electrical signal.

[0022] According to the above structure provided in the present embodiment, a plurality of axially connected groups of pump units are arranged in the shaftless multi-stage pump structure provided in the present embodiment, and each group of pump units is a stage, thereby forming a multi-stage booster pumping structure. Since the corresponding magnetic rotor 104 and winding 105 are respectively installed on the impeller 102 and the support 103 of each stage, the control system 106 connected to the winding 105 can drive the impellers 102 of each stage to rotate relative to the support 103 at different speeds through each winding 105 and the magnetic rotor 104. In this way, the impellers 102 of each stage can be better adapted to the characteristics of the pumped fluid, so that the impellers 102 of each stage can be guaranteed to operate in the optimal operating point area, thereby fully improving the overall pumping efficiency of the shaftless multi-stage pump structure in the present application, which is far superior to the prior art.

[0023] In another embodiment of the present application, please refer to Figures 1 to 4 The support member 103 includes a shell 101, a flow guide 113 and a stage partition plate 110. The shell 101, the flow guide 113 and the stage partition plate 110 form a flow channel 111; both ends of the impeller 102 extend along their own axial direction to form extension steps 107, and the extension steps 107 are used to be rotatably connected to the flow guide 113 and the stage partition plate 110 respectively; the flow channel 111 is used to connect the discharge port of the previous stage impeller 102 and the suction port of the next stage impeller 102.

[0024] According to the above structure provided in the present embodiment, since the impellers 102 of each stage in the present embodiment do not share the same driving shaft, different stages of pump units can be flexibly connected according to the actual working conditions. This is conducive to making the shaftless multi-stage pump structure provided in the present embodiment applicable to more working conditions and has a good use effect. Here, it can be understood that the connection of the pump units in the present embodiment can be achieved by setting a through hole parallel to the axial direction on the shell 101, and passing fasteners through the through hole to connect and fasten them in series as a whole, that is, the inter-stage connection technology of the existing multi-stage pump can be used. At the same time, the water flow components on the suction side and the discharge side of the shaftless multi-stage pump structure of the present embodiment can also adopt the suction side and the discharge side water flow component structure of the existing multi-stage pump.

[0025] In the embodiments of this application, please refer to Figures 1 to 4 The guide body 113 is fixedly installed in the housing 101, and the stage partition 110 is connected between two adjacent housings 101 or is integrally formed with the housing 101. For a specific embodiment, please refer to Figure 1 and Figure 2 The stage partition plate 110 is integrally formed with the housing 101, so that the connection interface of the interstage pump unit can be reduced, which is conducive to providing a better interstage sealing effect; please refer to Figure 3 and Figure 4In another embodiment, the stage partition plate 110 and the shell 101 are split structures and the stage partition plate 110 is connected between two adjacent shells 101, which facilitates the casting or forging processing of the shell 101 and the stage partition plate 110 and reduces the processing difficulty; the extended step 107 located at the suction end of the impeller 102 in the two adjacent pump units forms a rotating friction pair with the stage partition plate 110 of the previous pump unit, and the extended step 107 located at the discharge end of the impeller 102 forms a rotating friction pair with the guide body 113, thereby forming a reliable slewing support for the impeller 102, thereby improving the stability and reliability of the shaftless multi-stage pump of the present application.

[0026] In another embodiment of the present application, please refer to Figures 5 and 6 The guide body 113 is integrally formed with the shell 101, the stage partition plate 110 is connected between two adjacent shells 101, and the extended step 107 located at one end of the suction port of the impeller 102 in the two adjacent pump units forms a rotating friction pair with the stage partition plate 110, and the extended step 107 located at one end of the discharge port of the impeller 102 forms a rotating friction pair with the guide body 113.

[0027] According to the above structure provided in the present embodiment, the integral molding of the body guide 113 and the shell 101 can make the rigidity and strength of the body guide 113 better, which is beneficial to reduce vibration and noise. At the same time, a stage partition plate 110 and a shell 101 can form a complete pump unit, thereby more conveniently and flexibly assembling a shaftless multi-stage pump structure suitable for various working conditions.

[0028] In another embodiment of the present application, please refer to Figure 1 and Figure 3 The winding 105 is arranged on the flow guide 113 and matched with the outer cylindrical surface of the magnetic rotor 104. In this way, the winding 105 and the magnetic rotor 104 have good coaxiality adaptability, and more pump units can be assembled with a smaller axial length.

[0029] In another embodiment of the present application, please refer to Figure 2 and Figure 4 The winding 105 is arranged on the stage partition plate 110 and matched with the end face of the magnetic rotor 104. In this way, since the outer diameter of the winding 105 is the same as the outer diameter of the magnetic rotor 104, the overall outer diameter of the pump is reduced under the same pumping parameters, which is more suitable for application scenarios that have requirements on the radial size of the pump.

[0030] In another embodiment of the present application, please refer to Figures 1 to 6 The pump unit further comprises a guide inlet ring 108 and a stage partition inlet ring 109 which are coaxial with the impeller 102 respectively; The guide body inlet ring 108 is padded between the guide body 113 and the extended step 107 at one end of the impeller 102 outlet, and the stage partition plate inlet ring 109 is padded between the stage partition plate 110 and the extended step 107 at one end of the impeller 102 suction port.

[0031] According to the above structure provided in this embodiment, the wear between the impeller 102 and the guide body 113 or the impeller 102 and the stage partition 110 can be effectively reduced, which is beneficial to ensure the stable operation of the shaftless multi-stage pump of the present application, reduce leakage, and ensure pumping efficiency.

[0032] In another embodiment of the present application, please refer to Figures 1 to 4 The shaftless multi-stage pump structure also includes a control system 106, which is electrically connected to the winding 105 and is used to control the rotational speed of the impeller 102 of each pump unit. In this way, the rotational speed of each stage of the impeller 102 can be controlled according to the pumped fluid characteristics, and the rotational speeds of the impellers 102 of each stage can be matched, and the best suction performance of the first-stage impeller can be achieved, so as to further obtain the optimal pumping efficiency.

[0033] In another embodiment of the present application, please refer to Figures 1 to 4 A cavity 114 is provided on the flow guide 113, and the cavity 114 is located at one end away from the suction port of the impeller 102. A balancing hole 112 is provided on the bottom wall of the cavity 114. The cavity 114 and the balancing hole 112 are used to balance the axial force of the impeller 102, thereby ensuring the stable operation of the shaftless multi-stage pump of the present application and improving the pumping efficiency.

[0034] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A shaftless multi-stage pump structure, characterized in that: include: A plurality of pump units are axially connected and arranged, wherein the suction port of the latter pump unit of any two adjacent pump units is connected to the discharge port of the former pump unit; the pump unit comprises an impeller (102) and a support member (103) for rotatably supporting the impeller (102); A drive unit, comprising a magnetic rotor (104) connected to the impeller (102) and a winding (105) connected to the support (103) and corresponding to the magnetic rotor (104), wherein the winding (105) is used to drive the magnetic rotor (104) to drive the impeller (102) to rotate under the action of an electrical signal; The support member (103) comprises a shell (101), a flow guide (113) and a stage partition plate (110); a flow passage (111) is formed between the shell (101), the flow guide (113) and the stage partition plate (110); Both ends of the impeller (102) are extended along the axial direction to form extension steps (107), and the extension steps (107) are used to be rotatably connected to the guide body (113) and the stage partition plate (110) respectively; The flow passage (111) is used to connect the discharge port of the impeller (102) of the previous stage and the suction port of the impeller (102) of the next stage; The pump unit further comprises a flow guide inlet ring (108) and a stage partition inlet ring (109) respectively coaxial with the impeller (102); The guide body inlet ring (108) is padded between the guide body (113) and the extended step (107) at one end of the discharge port of the impeller (102), and the stage partition plate inlet ring (109) is padded between the stage partition plate (110) and the extended step (107) at one end of the suction port of the impeller (102); It also includes a control system (106), wherein the control system (106) is electrically connected to the winding (105) and is used to control the rotation speed of the impeller (102) of each pump unit.

2. The shaftless multistage pump structure according to claim 1, characterized in that: The guide body (113) is fixedly installed in the housing (101); the stage partition plate (110) is connected between two adjacent housings (101) or is integrally formed with the housing (101); the extended step (107) located at one end of the suction port of the impeller (102) in two adjacent pump units forms a rotational friction pair with the stage partition plate (110) of the previous stage pump unit, and the extended step (107) located at one end of the discharge port of the impeller (102) forms a rotational friction pair with the guide body (113).

3. The shaftless multi-stage pump structure according to claim 2, characterized in that: The guide body (113) and the housing (101) are integrally formed, the stage partition plate (110) is connected between two adjacent housings (101), the extended step (107) located at one end of the suction port of the impeller (102) in two adjacent pump units and the stage partition plate (110) form a rotational friction pair, and the extended step (107) located at one end of the discharge port of the impeller (102) and the guide body (113) form a rotational friction pair.

4. The shaftless multistage pump structure according to any one of claims 1 to 3, characterized in that: The winding (105) is arranged on the body conductor (113) and is matched with the outer circumferential surface of the magnetic rotor (104).

5. The shaftless multi-stage pump structure according to any one of claims 1 to 3, characterized in that: The winding (105) is arranged on the interstage plate (110) and is matched with the end surface of the magnetic rotor (104).

6. The shaftless multi-stage pump structure according to claim 5, characterized in that: A cavity (114) is provided on the guide body (113), the cavity (114) is located at an end away from the suction port of the impeller (102), a balancing hole (112) is provided on the bottom wall of the cavity (114), and the cavity (114) and the balancing hole (112) are used to balance the axial force of the impeller (102).

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