Pump body and centrifugal pump

Abstract

A pump body and a centrifugal pump, the pump body comprises a pump shell, a stator assembly and a metal waterproof sleeve installed on the inner periphery of the stator assembly, the waterproof sleeve comprises a cylindrical main body part and an annular surrounding edge part extending outwards in the radial direction from the opening side of the main body part, and the pump body is characterized in that the pump shell is formed by injection molding with the stator assembly and the waterproof sleeve as inserts; the annular shell part surrounds the stator assembly, the end cover parts are formed by extending inwards in the radial direction from the two axial sides of the shell part respectively, and an iron core and a winding of the stator assembly are contained in a stator cavity defined by the shell part, the end cover parts and a waterproof sleeve in a sealed mode. According to the utility model, the pump body is fixed on the waterproof sleeve and the stator assembly through mold injection molding, so that the iron core and the winding can be sealed and protected, the production process is simple, and the optimized waterproof sleeve can improve the heat dissipation capability and the breakage resistance of the pump body and the external heat dissipation capability. The improved pump body has the advantages that the production process is simplified, and the service life is also considered.

Description

Technical Field

[0001] The present invention relates to a pump body and a centrifugal pump, and the IPC classification number thereof is F04D13 / 06. Background Art

[0002] Existing injection-molded pump bodies consist of a stator assembly and a pump casing injection-molded onto the stator assembly. To improve the electromagnetic performance of water pumps using these pump bodies, the wall thickness of the plastic water barrier, which radially mates with the stator assembly's core, is typically less than 1 mm. However, injection-molded water barriers are prone to weld marks. During operation, these existing pump bodies are susceptible to the impact of heat, cold, or impurities, leading to cracking and damage, shortening the service life of the pump body and the water pump using them. Summary of the Invention

[0003] In order to solve the problems described in the background technology, the present invention provides the following technical solutions:

[0004] A pump body comprises a pump casing, a stator assembly and a metal water-blocking sleeve installed on the inner circumference of the stator assembly, the water-blocking sleeve comprising a cylindrical main body portion and an annular rim portion extending radially outward from the opening side of the main body portion, and is characterized in that the pump casing is injection-molded with the stator assembly and the water-blocking sleeve as inserts, comprising an annular outer shell portion surrounding the stator assembly and end cover portions extending radially inward from both axial sides of the outer shell portion, the iron core and windings of the stator assembly are sealed and accommodated in a stator cavity surrounded by the outer shell portion, the end cover portions and the water-blocking sleeve.

[0005] The pump body of this utility model is fixed to the watertight sleeve and stator assembly through mold injection molding, thus sealing and protecting the core and windings. The production process is simple, and the optimized watertight sleeve improves the pump body's internal and external heat dissipation and crack resistance. This improved pump body simplifies the production process while ensuring a longer service life.

[0006] Furthermore, the surrounding edge portion includes a bent portion formed by bending at its outer edge for the outer shell portion to be inserted into.

[0007] Furthermore, the surrounding edge portion further includes an annular inner recess formed by recessing the axial end surface thereof on the side facing away from the stator assembly.

[0008] Furthermore, a plurality of through holes are provided in the circumferential direction of the side wall of the inner recess, which are connected to the bent portion and the inner recess, and the inner recess is filled with injection-molded plastic to form a fixing portion of the pump housing.

[0009] Furthermore, the fixing portion includes an annular protrusion protruding axially from the end surface of the peripheral portion.

[0010] Furthermore, the wall surface of the inner recessed portion is provided with concave and convex embossings.

[0011] Furthermore, an annular mounting portion protrudes from the center of the cylindrical inner cavity of the water-blocking sleeve.

[0012] Furthermore, the main body includes a first main body part and a second main body part with different outer diameters, and a connecting part connecting the two. The iron core is sleeved on the radial outside of the first main body part, and the connecting part is used for the iron core and / or coil frame of the stator assembly to abut and position.

[0013] Furthermore, the wall thickness L1 of the main body is 0.1 mm-0.4 mm.

[0014] A centrifugal pump comprises a pump cover and a rotor with an impeller, characterized in that it also comprises any of the above-mentioned pump bodies, the rotor is rotatably mounted in the cylindrical inner cavity of the water-blocking sleeve of the pump body, and the pump cover is arranged on the pump body.

[0015] The centrifugal pump of the utility model has improved production process and working stability by optimizing the design of the pump body.

[0016] Furthermore, the centrifugal pump also includes a sealing ring arranged between the pump body and the pump cover, the sealing ring includes an annular outer ring portion located radially outside, an annular inner ring portion located radially inside the outer ring portion, and a connecting bridge connecting the two, the axial thickness of the outer ring portion and the inner ring portion are equal, and greater than the axial thickness of the connecting bridge.

[0017] The more specific design and technical effects of the present invention are further explained in the specific implementation manner in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the pump body of the utility model;

[0019] Figure 2 This is an axial cross-sectional view of the pump body of the utility model;

[0020] Figure 3 This is a schematic diagram of the three-dimensional structure of the stator assembly of the utility model with a water-blocking sleeve installed;

[0021] Figure 4 This is a schematic diagram of the three-dimensional structure of the water-blocking sleeve of the utility model;

[0022] Figure 5 It is a top view of the water-blocking sleeve of the utility model;

[0023] Figure 6 This is an axial cross-sectional view of the water blocking sleeve of the present invention;

[0024] Figure 7 This is a schematic diagram of the three-dimensional structure of the centrifugal pump of the present utility model;

[0025] Figure 8 This is a schematic diagram of the three-dimensional structure of the sealing ring of the utility model;

[0026] in:

[0027] 1- stator cavity, 2- impeller cavity, 10- pump body, 20- pump cover, 30- rotor, 31- impeller, 40- sealing ring, 41- outer ring, 42- inner ring, 43- connecting bridge, 100- pump casing, 110- outer casing, 120- end cover, 130- fixed part, 131- raised part, 200- stator assembly, 210- iron core, 220- winding, 230- coil frame, 300- waterproof sleeve, 310- main body, 311- mounting part, 312- first main body, 313- second main body, 314- connecting part, 320- surrounding edge, 321- bending part, 322- inner concave part, 323- through hole, 324- embossing 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 only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See Figures 1 to 3 The utility model discloses a pump body 10, including a pump casing 100, a stator assembly 200 and a metal water-blocking sleeve 300 inserted and installed on the inner circumference of the stator assembly 200, wherein the stator assembly 200 includes an iron core 210, a coil frame 230 fixed on the iron core 210 and a winding 220 wound on the coil frame 230, and the water-blocking sleeve 300 includes a cylindrical main body 310 and an annular surrounding edge 320 extending radially outward from one side of the opening of the main body 310. The pump housing 100 of the present invention is a plastic casing, which is injection-molded with the stator assembly 200 and watertight sleeve 300 as inserts and affixed to the stator assembly 200 and watertight sleeve 300. The pump housing 100 includes an annular outer shell 110 that surrounds the stator assembly 200 and end caps 120 that extend radially inward from either axial side of the outer shell 110 to the outer periphery of the watertight sleeve 300. The outer shell 110, end caps 120, and watertight sleeve 300 define a stator cavity 1, within which the core 210 and windings 220 of the stator assembly 200 are hermetically contained. The sealing of the present invention complies with IP54, the IP protection rating.

[0030] The pump body of this utility model is fixed to the watertight sleeve and stator assembly through mold injection molding, thus sealing and protecting the core and windings. The production process is simple, and the optimized watertight sleeve improves the pump body's internal and external heat dissipation and crack resistance. This improved pump body simplifies the production process while ensuring a longer service life.

[0031] Preferably, see Figure 2 、 Figure 4 and Figure 6 The edge portion 320 of the water-blocking sleeve 300 of the present invention includes a bent portion 321 formed at its outer edge for the outer shell portion 110 to be inserted into. After the pump housing 100 is injection molded, the pump housing 100 wraps the bent portion 321. The pump housing 100 designed in this way can reduce the probability of cracking at the junction of the pump housing 100 and the water-blocking sleeve 300 after injection molding, thereby improving the production qualification rate of the pump body. Preferably, the bent portion 321 of the present invention is an annular body with an axial cross-section of "L" formed by bending at the outer edge of the edge portion 320. Of course, as other embodiments, the bent portion can also be designed to be bent at the outer edge of the edge portion to form an axial cross-section of "W" or "V", or other structures that can allow the outer shell portion 110 to extend into to limit the axial movement of the pump housing and the water-blocking sleeve can also achieve the above-mentioned technical effects. Furthermore, the edge portion 320 also includes an annular inner recess 322 formed on the axial end surface of the side facing away from the stator assembly 200. The design of the inner recess 322 can facilitate the subsequent insertion and installation of the sealing ring, thereby facilitating the subsequent automated installation of the pump body. Figure 5 The wall surface of the inner recess 322 of the present invention is provided with a concave and convex embossing 324. This design can improve the connection strength between the plastic flowing into the inner recess and the waterproof sleeve during injection molding of the pump casing, thereby reducing the problem of cracks between the pump casing and the waterproof sleeve affecting the waterproof performance of the pump body.

[0032] Further, see Figure 2 and Figure 4 The side wall of the inner recess 322 is provided with several through holes 323 that connect the bent portion 321 and the inner recess 322. When the pump housing 100 is injection molded, the molten plastic can pass through the through holes 323 from the side of the bent portion 321 to fill the inner recess 322 with plastic to form the fixing portion 130 of the pump housing 100. This design further improves the connection strength between the pump housing 100 and the water-blocking sleeve 300, reduces the risk of cracking at the connection between the pump housing 100 and the water-blocking sleeve 300 during use, and improves the working stability of the pump body. Figure 2 The fixing portion 130 of the pump housing 100 of the present invention includes an annular protrusion 131 that is axially protruding higher than the end face of the surrounding edge portion 320. This design can be used to position the sealing ring when the pump body and the sealing ring are assembled, thereby improving the working stability of the pump body while taking into account subsequent assembly.

[0033] Preferably, see Figure 2 and Figure 6The bottom center of the cavity of the water-blocking sleeve 300 of the present invention is raised with an annular mounting portion 311. This design can provide positioning support for the assembly of the pump body and subsequent parts (such as the rotor), making it easier to install the pump body and subsequent parts. Furthermore, the main body 310 of the water-blocking sleeve 300 includes a first main body 312, a second main body 313, and a connecting portion 314 connecting the first main body 312 and the second main body 313, which are annular and have different outer diameters. During assembly, the iron core 210 is sleeved on the radially outer side of the first main body 312. At this time, the connecting portion 314 is provided for the axial end face of the coil frame 230 of the stator assembly 200 to abut. The pump body of this design can solve the problem of deformation caused by axial movement of the stator assembly during the injection molding process of the pump casing and collision with the water-blocking sleeve. Preferably, in order to improve the electromagnetic performance of the centrifugal pump using this pump body, the wall thickness L1 of the main body 310 of the present invention is 0.1-0.4mm.

[0034] See Figure 7 The present invention further discloses a centrifugal pump comprising the aforementioned pump body 10, a pump cover 20 disposed on the pump body 10, and a rotor 30 rotatably mounted on the pump body 10. An impeller 31 is provided at one axial end of the rotor 30, and the impeller 31 is housed within an impeller chamber 2 defined by the pump body 10 and the pump cover 20. The centrifugal pump of the present invention improves its production process and operating stability through an optimized design of the pump body.

[0035] See Figure 7 and Figure 8 The centrifugal pump of the present invention is provided with a sealing ring 40 in the axial direction between the pump body 10 and the pump cover 20. Preferably, the sealing ring 40 includes an annular outer ring portion 41 located radially outside, an annular inner ring portion 42 located radially inside the outer ring portion, and a connecting bridge 43 connecting the outer ring portion 41 and the inner ring portion 42, wherein the axial thickness of the outer ring portion 41 and the inner ring portion 42 are equal, and both are greater than the axial thickness of the connecting bridge 43. Preferably, the raised portion 131 of the pump body 10 is clamped between the outer ring portion 41 and the inner ring portion 42 of the sealing ring 40. The sealing ring of this design can be stably installed on the pump body and is not easily deformed, thereby reducing the leakage of the centrifugal pump due to leakage and improving the safety of the centrifugal pump.

Claims

1. A pump body, comprising a pump housing (100), a stator assembly (200) and a metal watertight sleeve (300) mounted on the inner periphery of the stator assembly, wherein the watertight sleeve (300) comprises a cylindrical main body (310) and an annular peripheral edge (320) extending radially outward from an opening side of the main body, characterized in that: The pump housing (100) is formed by injection molding with the stator assembly (200) and the watertight sleeve (300) as inserts, and comprises an annular outer shell portion (110) surrounding the stator assembly (200) and an end cover portion (120) extending radially inward from both axial sides of the outer shell portion; the iron core (210) and the winding (220) of the stator assembly (200) are sealed and accommodated in a stator cavity (1) surrounded by the outer shell portion (110), the end cover portion (120) and the watertight sleeve (300).

2. The pump body according to claim 1, characterized in that: The surrounding edge portion (320) includes a bent portion (321) bent at its outer edge to form a bent portion for the outer shell portion (110) to be inserted into.

3. The pump body according to claim 2, characterized in that: The surrounding edge portion (320) further includes an annular inner recess (322) formed by a depression on the axial end surface of the side facing away from the stator assembly (200).

4. The pump body according to claim 3, characterized in that: The side wall of the inner recess (322) is circumferentially provided with a plurality of through holes (323) connecting the bent portion (321) and the inner recess (322); the inner recess (322) is filled with injection-molded plastic to form a fixing portion (130) of the pump housing (100).

5. The pump body according to claim 4, characterized in that: The fixing portion (130) comprises an annular protrusion (131) protruding axially from the end surface of the peripheral edge portion (320).

6. The pump body according to claim 3, characterized in that: The wall surface of the inner recess (322) is provided with concave and convex embossing (324).

7. The pump body according to claim 1, characterized in that: An annular mounting portion (311) protrudes from the center of the cylindrical inner cavity of the water-blocking sleeve (300).

8. The pump body according to claim 1 or 7, characterized in that: The main body (310) includes a first annular main body (312) with different outer diameters, a second main body (313) and a connecting portion (314) connecting the two. The iron core (210) is sleeved on the radial outer side of the first main body (312), and the connecting portion (314) is used for abutting and positioning the iron core and / or coil frame (230) of the stator assembly.

9. The pump body according to claim 1, characterized in that: The wall thickness L1 of the main body (310) is 0.1 mm-0.4 mm.

10. A centrifugal pump comprising a pump cover (20) and a rotor (30) with an impeller (31), characterized in that: It also comprises the pump body of any one of claims 1 to 9, wherein the rotor (30) is rotatably mounted on the cylindrical inner cavity of the water-blocking jacket (300) of the pump body, and the pump cover (20) is disposed on the pump body.

11. The centrifugal pump according to claim 10, characterized in that: The pump also includes a sealing ring (40) disposed between the pump body and the pump cover (20), wherein the sealing ring (40) includes an annular outer ring portion (41) located radially outward, an annular inner ring portion (42) located radially inward of the outer ring portion, and a connecting bridge (43) connecting the two, wherein the axial thickness of the outer ring portion (41) is equal to that of the inner ring portion (42), and is greater than the axial thickness of the connecting bridge (43).

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