CN217558573U - Centrifugal pump with double water outlet pipelines and washing equipment using centrifugal pump - Google Patents

Abstract

The utility model provides a centrifugal pump with two outlet conduit, including the pump cover, its inner chamber is equipped with the pumping chamber that plays the water guide effect around the impeller, and this inner chamber diapire central authorities are equipped with the sunction inlet of axial intercommunication pumping chamber, and this inner chamber perisporium is equipped with the first exhalant canal and the second exhalant canal of intercommunication pumping chamber, connect the pipeline of this two exhalant canals in perisporium syntropy protrusion and roughly parallel, the pumping chamber is equipped with the pressurized-water portion, in axial view, the internal perisporium of pressurized-water portion is formed by the tangent connection of the different curved surface of two sections curvature radius change trends, moreover the pipeline inner wall of internal perisporium and first exhalant canal and the pipeline inner wall of second exhalant canal are all tangent. Also provides a washing device applying the centrifugal pump. The design of the centrifugal pump can simultaneously take into account the efficiency of water drainage along the first discharge port pipeline and the second discharge port pipeline.

Description

Centrifugal pump with double water outlet pipelines and washing equipment using centrifugal pump

Technical Field

The utility model relates to a centrifugal pump with two outlet conduit, the centrifugal pump is applicable to the drainage and the recycling water of washing equipment, especially washing machine or dish washer, and IPC is categorised belongs to D06F 39/08.

Background

General washing equipment such as a washing machine, a dish washer and the like needs to be provided with a drainage pump to raise the drainage height, so that the drainage process is not limited by the position of an indoor floor drain. Meanwhile, in order to improve the washing degree of the laundry, the washing machine is often provided with a water circulation system for circularly pumping out the washing water in the water drum of the washing machine and spraying the washing water onto the laundry, and therefore, the washing machine is often provided with another drain pump dedicated to realizing water circulation. The prior art of this type of drain pump is found in the applicant's chinese patent applications publication nos. CN202954990U, CN202954989U, CN202602396U, CN202550703U, CN102182711A, CN102223011A and CN 102094832A.

In order to simplify the structure and reduce the cost, the prior art discloses a pump device which can realize double-pipeline drainage by adopting a single motor, and simultaneously realizes the functions of drainage and circulating water. However, how to balance the drainage efficiency of the drainage pipeline and the water outlet efficiency of the circulating pipeline is not considered, especially the water outlet efficiency of the circulating pipeline which needs to be compatible with the longer service time of the washing equipment.

The general knowledge and terms can be found in the mechanical engineering handbook 2 nd edition of mechanical industry Press 1997 and the Motor engineering handbook, in the mechanical industry Press 2014 1 st edition of Pump theory and technology, and in the national Standard GB/T7021 term of centrifugal pumps.

Disclosure of Invention

To the problem and the demand mentioned above, the utility model provides a centrifugal pump with two outlet conduit, include:

-the impeller is a semi-open impeller formed by injection molding;

the pump cover is provided with an inner cavity 60 with one open end, the inner cavity 60 is provided with a water pumping chamber surrounding the impeller and playing a role in water guiding, the bottom wall of the inner cavity 60 is provided with a suction inlet axially communicated with the water pumping chamber, the peripheral wall of the inner cavity 60 is provided with a first outlet and a second outlet communicated with the water pumping chamber, a pipeline connected with the two outlets protrudes in the same direction of the peripheral wall and is approximately parallel to the peripheral wall, and the water pumping chamber comprises: a tongue partition portion which is positioned between the first discharge port and the second discharge port and protrudes toward the center of the inner cavity 60, and a water-pressing portion which protrudes toward the center of the inner cavity 60 is arranged on one side corresponding to the tongue partition portion;

in an axial view, the inner peripheral wall of the water pressing part is formed by tangentially connecting two curved surfaces with different curvature radius change trends, and the inner peripheral wall is tangent to the inner wall of the pipeline connected with the first discharge port and the inner wall of the pipeline connected with the second discharge port.

The impeller of the centrifugal pump can tangentially discharge water along the pipeline of the first discharge port when rotating along the first direction and tangentially discharge water along the pipeline of the second discharge port when rotating along the second direction.

Preferably, the inner circumferential wall is composed of two sections of spiral curved surfaces with opposite increasing directions of curvature radius, the two sections of spiral curved surfaces have the same starting point and are arranged on a plane which passes through the axial center line of the inner cavity 60 and is parallel to the center line of the first discharge port pipeline and/or the center line of the second discharge port pipeline, and the distance from the starting point to the center of the inner cavity 60 is set as R ₁ Then R is ₁ The radius of the inner wall of the tongue partition is larger, the end point of the spiral curved surface at one side of the first discharge port is tangent with the inner wall of the first discharge port pipeline, the end point of the spiral curved surface at one side of the second discharge port is tangent with the inner wall of the second discharge port pipeline, and the two sections are tangent at the starting point.

In the pipeline formed by the spiral curved surface and the impeller, kinetic energy can be continuously converted into pressure energy, larger drainage pressure is gradually formed, and drainage efficiency can be improved, so that the efficiency of drainage from the first discharge port pipeline and the efficiency of water circulation from the second discharge port pipeline can be simultaneously considered by the water pressing part formed by the two sections of spiral curved surfaces with the opposite increasing directions of the curvature radius.

Preferably, the inner circumferential wall is composed of a section of spiral curved surface with a continuously increasing curvature radius and a section of arc curved surface with a constant curvature radius, the starting point of the arc curved surface is tangent to the inner wall of the second discharge pipe, the starting point of the spiral curved surface is connected with the end point of the arc curved surface and is tangent to a plane passing through the axial center line of the inner cavity 60 and being parallel to the center line of the first discharge pipe and/or the center line of the second discharge pipe, and the end point of the spiral curved surface is tangent to the inner wall of the first discharge pipe.

The design of the water pressing part of the arc-shaped curved surface with the unchanged curvature radius can meet the requirements of certain efficiency of circulating water from the second outlet pipeline and lower water outlet lift, and the design of the water pressing part of the other side with the circumferential curved surface with the constantly increased unidirectional curvature radius can improve the water discharging efficiency from the first outlet pipeline and improve the water discharging lift as much as possible, and meets the use requirements of customers on shortening the water discharging time of equipment or improving the height of a water discharging outlet.

Further, the inner peripheral wall of the tongue partition is an arc-shaped surface, the center of the arc-shaped surface coincides with the center of the inner cavity 60 and the center of the impeller, the tongue partition is further provided with two side walls, namely a first side wall adjacent to the first discharge port and a second side wall adjacent to the second discharge port, the first side wall and the arc-shaped surface are intersected to form a first tongue tip portion, the second side wall and the arc-shaped surface are intersected to form a second tongue tip portion, and the first tongue tip portion and the second tongue tip portion are subjected to chamfering treatment.

Furthermore, in a plane sectional view of the central line of the first outlet pipe and perpendicular to the axial central line of the inner cavity 60, the first side wall passes through an intersection point I1 of the inner wall of the first outlet pipe and the wall of the inner cavity 60 and intersects the arc-shaped surface at an intersection point I2, the intersection point I2 and the center of the inner cavity 60 form a line L1, the line L1 and the transverse central line of the inner cavity 60 form an included angle Q1, and the included angle Q1 is an acute angle; in a plane cross-sectional view passing through the center line of the second discharge port pipe and perpendicular to the axial center line of the inner cavity 60, the second side wall passes through an intersection point I3 of the inner wall of the second discharge port pipe and the wall of the inner cavity 60 and intersects with the arc-shaped surface at an intersection point I4, the intersection point I4 and the center of the inner cavity 60 form a line L2, the line L2 and the transverse center line of the inner cavity 60 form an included angle Q2, and the included angle Q2 is an acute angle.

The design of the tongue partition enables most of liquid to be discharged along the discharge outlet pipeline facing the rotation direction of the impeller under the combined action of the rotation centrifugal force of the impeller and the pressure resistance of the tongue partition, even if part of liquid entering the gap pipeline between the tongue partition and the impeller flows out of the tongue partition, the flow speed is high, the pressure is low, and the main component flow direction deviates from the water discharge direction of the other discharge outlet pipeline, so that the other discharge outlet pipeline cannot generate large water discharge pressure, the discharge outlet pipeline cannot discharge water under the set lift, the normal water discharge of the discharge outlet pipeline facing the rotation direction of the impeller is not interfered, and the water discharge efficiency is high.

Preferably, the value of the Q1 angle satisfies the defining condition: 15 DEG ≦ Q1 ≦ 60 deg. Since cos60 ° =0.5, the main component flow of more than half of the liquid is deviated from the water outlet direction of the first outlet pipe, so that the first outlet pipe cannot generate large water outlet pressure, and the water outlet pipe communicating with the first outlet pipe, namely the water outlet pipe, has high set lift, so that the water outlet pipe cannot discharge water.

Preferably, the Q2 angle value satisfies the defining condition: 0 DEG ≦ Q2 ≦ 30 deg. Because cos is 30 degrees and is not larger than 0.866, the main component flow direction of the part of liquid which is more than 80 percent deviates from the water outlet direction of the second outlet pipeline, so that larger water outlet pressure cannot be formed on the second outlet pipeline, namely the circulating pipeline, cannot discharge water under lower lift, the normal water discharge of the first outlet pipeline, namely the water discharge pipeline, cannot be interfered, and the normal water discharge efficiency of the water discharge pipeline is higher.

Preferably, the angle value of included angle Q1 is greater than the angle value of included angle Q2. Therefore, the drainage efficiency of the drainage pipeline can be improved as much as possible and the drainage lift can be improved under the condition of meeting a certain circulating water outlet lift, and the use experience of customers on shortening the drainage time or high drainage lift can be better met.

Further, the impeller is a forward vane impeller. The design can meet the water requirement of higher lift during drainage and lower lift during recycling water.

The utility model also provides a washing equipment, including washing machine, dish washer and washing-drying all-in-one, its configuration possesses the centrifugal pump of arbitrary above-mentioned technical characteristic. When the impeller of the centrifugal pump rotates along a first direction, water is led to the drainage hose of the washing machine from the first discharge outlet pipeline, washing wastewater is discharged out of the outer barrel through the drainage hose, and the drainage lift is high; when the impeller of the centrifugal pump rotates along the second direction, water flows from the second outlet pipeline to the washing machine circulation hose, and the circulation hose is connected to the annular cavity, so that the circulation water conveyed by the circulation hose can be sprayed to clothes in the inner barrel through the annular cavity circulation water nozzle, and the circulation water lift is lower than the drainage lift and is generally 2/3 of the drainage lift. This washing equipment compromises the efficiency of drainage and circulating water simultaneously, can not take place drainage pipe and circulating line simultaneously and go out the water phenomenon moreover, does not produce the phenomenon of crossing water promptly, and drainage pipe and circulating line's drainage efficiency is all higher.

The technical solution and effects of the present invention will be further described in the detailed description with reference to the accompanying drawings.

Drawings

Fig. 1 is an axial sectional view of embodiment 1 of the centrifugal pump of the present invention.

Fig. 2 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 1.

Fig. 3 is a schematic structural diagram of pump cover embodiment 1 of the centrifugal pump of the present invention.

Fig. 4 is a front view of pump cover embodiment 1 of the centrifugal pump of the present invention.

Fig. 5 is a sectional view B-B of fig. 4.

Fig. 6 is a cross-sectional view C-C of fig. 5.

Fig. 7 is a front view of pump cover embodiment 2 of the centrifugal pump of the present invention.

Fig. 8 is an axial sectional view of pump cover embodiment 3 of the centrifugal pump of the present invention.

Fig. 9 is a cross-sectional view taken along line D-D of fig. 8.

Fig. 10 is a radial cross-sectional view of centrifugal pump embodiment 2 of the present invention.

Fig. 11 is a schematic structural diagram of an embodiment of the washing apparatus of the present invention.

Reference numerals

The permanent magnet washing machine comprises a permanent magnet rotor 1, an iron core 2, an impeller 5, a blade inner side 51, a blade outer side 52, a pump cover 6, an inner cavity 60, a first discharge port 61, a second discharge port 62, a suction port 63, a water pressing chamber 64, a tongue isolating part 65, a first side wall 651, a second side wall 652, an arc-shaped surface 653, a first tongue tip part 654, a second tongue tip part 655, a water pressing part 66, an inner circumferential wall 661, a first water introducing part 67, a second water introducing part 68, a pump body 7, a rotor cylinder 71, an impeller cavity 101, a drum washing machine 10, a shell 11, an outer cylinder 12, an observation window 13, a circulating hose 14 and a drainage hose 15.

Detailed Description

The utility model discloses an improve on prior art centrifugal pump's basis and form, it has inherited the basic structure of prior art centrifugal pump. Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. For simplicity of description, the present specification defines the following orientations and parts: the side of the suction inlet of the pump cover is taken as the upper side or the upper side, and the side of the motor is taken as the lower side or the lower side; the pipeline connected with the first discharge port is a first discharge port pipeline and is also a drainage pipeline; the pipeline connected with the second discharge port is a second discharge port pipeline and is also a circulating pipeline; the center of the impeller is taken as the center of the inner cavity of the pump cover, the axis of the impeller is taken as the axial center line of the inner cavity of the pump cover, and the circumferential wall of the inner cavity refers to the wall surface of the inner cavity surrounding the center line and comprises a cylindrical surface parallel to the center line. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

In the embodiment of the present invention, the working fluid pumped by the centrifugal pump may be water, but may also be other types of working fluids or solutions. In particular, although the names of some components in the present invention refer to the words "water", such as "pumping chamber", "drain pipe", etc., it does not mean that the working fluid in the present invention is necessarily water, and may be used to introduce or drain other working fluids besides water.

Fig. 1 is an axial sectional view ofbase:Sub>A centrifugal pump embodiment 1 with double water outlet pipes through the axis ofbase:Sub>A rotating shaft of an electric motor, and fig. 2 is anbase:Sub>A-base:Sub>A sectional view of fig. 1, and as shown in fig. 1 and 2, the centrifugal pump comprises:

an electric motor (fig. 1 shows a permanent magnet rotor 1, a stator core 2 of the electric motor) and an impeller 5 driven by the electric motor and coaxially driven with the permanent magnet rotor 1. The impeller 5 is a semi-open impeller formed by injection molding, and generally has 4 radial blades (the number of the blades can also be 3, 5 or 6, and the adoption of odd-numbered blades is more favorable for reducing vibration noise);

the pump cover 6 is provided with an inner cavity 60 with one open end, the inner cavity 60 is provided with a water pumping chamber 64 which surrounds the impeller 5 and plays a role in water guiding, the center of the bottom wall of the inner cavity 60 is provided with a suction port 63 which is axially communicated with the water pumping chamber 64, and the peripheral wall of the inner cavity 60 is provided with a first outlet 61 and a second outlet 62 which are communicated with the water pumping chamber 64;

a pump body 7 that supports and/or closes the motor, the impeller 5 and the pump cover 6;

the rotor tube 71 formed by injection molding with the pump body 7 is inserted between the stator and the rotor of the permanent magnet synchronous motor to play a water-stop role.

The pump body 7 and the pump cover 6 face and are fixed to form an impeller cavity 101 for containing the impeller 5, the center of the impeller cavity 101 is overlapped with the center of the impeller 5, the impeller cavity 101 comprises a pumping chamber 64 of the pump cover, and the suction port 63 is used for introducing water or other working liquid into the pumping chamber 64.

In the present embodiment, by way of example only, referring to fig. 2, the pipe connecting the first discharge port 61 and the pipe connecting the second discharge port 62 are arranged in the same direction, i.e., both extend outward in the same direction from the peripheral wall of the pump cover 6, and the pipe center lines of both are substantially parallel. The conduits of the first discharge opening 61 and the second discharge opening 62 may have different cross-sectional areas, for example, as shown in fig. 2, the cross-sectional area of the conduit of the first discharge opening 61 is larger than the cross-sectional area of the conduit of the second discharge opening 62, which is advantageous for setting different head heights for discharging liquid from different discharge openings.

When the motor drives the impeller 5 to rotate in the counterclockwise direction as viewed from the projection direction of the view of fig. 2 (i.e., the suction port water intake direction), the working fluid (in particular, the waste working fluid) exits the pumping chamber 64 from the first discharge port 61; conversely, when the motor drives the impeller 5 to rotate in the clockwise direction, the working fluid exits the pumping chamber 64 from the second discharge port 62.

As shown in fig. 3-6, in pump cover embodiment 1 of the centrifugal pump of the present invention, an inner cavity 60 with one open end is formed in the interior of the pump cover 6, a suction port 63 is formed in the center of the bottom wall at the upper end of the inner cavity 60, and a pipe, i.e., a water inlet pipe, which is communicated with the suction port 63 is formed by axially extending and protruding the periphery of the suction port 63 upward; a first discharge port 61 and a second discharge port 62 which are communicated with the cavity 60 are respectively arranged on the peripheral wall of the cavity 60, and a pipeline, namely a drainage pipeline, which is connected with the first discharge port 61 is formed by extending the first discharge port 61 along the periphery of the first discharge port to protrude outwards of the peripheral wall; a pipe, i.e., a circulation pipe, which is in communication with the second discharge port 62 is formed to protrude outward of the peripheral wall in a direction substantially parallel to the discharge pipe.

The inner chamber wall between the first discharge opening 61 and the second discharge opening 62 is provided with a tongue-like partition 65 projecting toward the center of the inner chamber 60 on the side adjacent to the discharge opening, the tongue-like partition 65 is flush with the bottom wall of the inner chamber 60, and the top end of the tongue-like partition 65 is substantially flush with the duct wall of the first discharge opening 61 having a larger cross-sectional area, and the distance between them is preferably not more than 2mm. The tongue 65 of this embodiment is separately formed and secured to the cavity 60. In other embodiments, the tongue 65 may be integrally injection molded with the pump cover 6.

The inner peripheral wall of the tongue-separating portion 65 is arc-shaped to form an arc-shaped surface 653, and the center of the arc-shaped surface 653 preferably coincides with the center of the inner cavity 60 and the center of the impeller 5. An anti-interference gap t is formed between the arc-shaped surface 653 and the impeller 5, and can be selected according to the design gap between the base circle diameter of the volute body and the impeller in pump theory and technology, namely, the following limiting conditions are met: t is more than or equal to 0.015D2 and less than or equal to 0.04D2, wherein D2 is the outer diameter of the impeller, the diameter of the circle where the arc-shaped surface 653 is located is equal to the diameter D3 of the base circle, and D3= (1.03-1.08) D2 exists.

The tongue-separating portion 65 also has two side walls, namely a first side wall 651 adjoining the first discharge opening 61 and a second side wall 652 adjoining the second discharge opening 62. The first sidewall 651 meets the arcuate face 653 to form a first lingual tip 654, the second sidewall 652 meets the arcuate face 653 to form a second lingual tip 655, and both the first lingual tip 654 and the second lingual tip 655 are chamfered, preferably filleted. Fig. 6 is a cross-sectional view of the C-C plane perpendicular to the axial centerline of the inner cavity 60 and passing through the centerline of the first discharge port 61, in fig. 6, the first side wall 651 passes through an intersection point I1 of the inner wall of the first discharge port 61 and the inner wall of the inner cavity 60 and intersects with the arc surface 653 at an intersection point I2, the intersection point I2 forms a line L1 with the center of the inner cavity 60, the line L1 forms an included angle Q1 with the transverse centerline of the inner cavity 60, the included angle Q1 is an acute angle, and the value of the angle preferably satisfies the following defined condition: q1 ≦ 15 ° or less is 60 °, specifically, 60 °, 50 °, 40 °, 30 °, 20 °, 15 °, or the like can be selected. Similarly, in a cross-sectional view of a plane perpendicular to the axial centerline of the inner cavity 60 and passing through the centerline of the second discharge port 62, the second side wall 652 passes through an intersection point I3 of the inner wall of the second discharge port 62 and the inner wall of the inner cavity 60 and intersects the arc-shaped surface 653 at an intersection point I4, the intersection point I4 forms a line L2 with the center of the inner cavity 60, the line L2 forms an included angle Q2 with the transverse centerline of the inner cavity 60, the included angle Q2 is an acute angle, and the value of the angle preferably satisfies the defined condition: q2 is 0 ° or more and 30 ° or less, and specifically, 30 °, 25 °, 20 °, 15 °, 10 °, 5 °, 0 °, or the like can be selected. In the present embodiment, the first discharge port 61 and the second discharge port 62 are on the same horizontal plane.

As shown in fig. 3-5, a pressurized water portion 66 protruding toward the center of the inner cavity 60 is provided on the other side corresponding to the tongue portion 65, the pressurized water portion 66 is also on the same bottom wall as the inner cavity 60 and has a height flush with the tongue portion 65, and in a view projected along the axial center line of the inner cavity 60, the inner circumferential wall 661 of the pressurized water portion 66 is tangent to both the inner wall of the pipe of the first discharge port 61 and the inner wall of the pipe of the second discharge port 62. In the embodiment shown in fig. 4, the inner circumferential wall 661 is composed of two sections of spiral curved surfaces with opposite increasing directions of curvature radius, the two sections of spiral curved surfaces have the same starting point, the starting point is provided on a plane passing through the axial center line of the inner cavity 60 and parallel to the center line of the pipe of the first discharge port 61 and/or the center line of the pipe of the second discharge port 62, and the starting point is at a distance R from the center of the inner cavity 60 ₁ Then R is ₁ The radius of the arc-shaped surface 653 is larger, the spiral curve end point on one side of the first discharge port 61 is tangent to the inner wall of the first discharge port 61, the spiral curve end point on one side of the second discharge port 62 is tangent to the inner wall of the second discharge port 62, and the two sections of spiral curves are tangent at the starting point. The curvature radius of each curved surface is based on the radius of a tangent circle of a cylindrical surface part parallel to the central line of the inner cavity, and the radius is the same as the radius. The press section 66 of the present embodiment is separately formed and fixed to the inner chamber 60. In other embodiments, water pressing portion 66 may be formed integrally with pump cover 6 by injection molding.

A first water introducing part 67 is formed in the cavity 60 between the end point of the inner peripheral wall 661 and the first side wall 651 on the side of the first discharge port 61, and the first water introducing part 67 is preferably circular arc-shaped; on the second discharge port 62 side, a second water introducing portion 68 is formed in the portion of the cavity 60 between the end point of the inner peripheral wall 661 and the second side wall 652, and the second water introducing portion 68 is preferably circular arc-shaped.

As shown in fig. 3, the first water introducing part 67, the second water introducing part 68, the arc-shaped surface 652 of the tongue partition 65, the first side wall 653 and the second side wall 654, and the inner peripheral wall 661 of the water pressing part 66 together form the water pressing chamber 64, and the axial height of the water pressing chamber 64 is the axial height of the tongue partition 65 and the water pressing part 66, that is, the height from the top end of the tongue partition 65 or the top end of the water pressing part 66 to the bottom wall of the inner cavity 60 along the axial direction.

Hereinafter, the process of circulating and draining the centrifugal pump of the present invention will be described by taking the pressurized-water portion 66 of the inner peripheral wall 661 formed by two spiral curved surfaces as shown in fig. 4 as an example. Wherein the inner and outer sides of the impeller blades are defined with reference to the direction of rotation of the impeller: when the impeller rotates, the impeller blade side that is forward in the impeller rotation direction is defined as a blade inner side 51, and the other side is defined as a blade outer side 52.

When the impeller 5 rotates clockwise as viewed in the direction of the view of fig. 6 (back to the suction port water intake direction), the working fluid (in particular, the waste working fluid) exits the pumping chamber 64 from the first discharge port 61. Specifically, when the impeller 5 rotates clockwise, the inner side 51 of the impeller blade is a high-pressure region and the outer side 52 of the blade is a low-pressure region by the centrifugal force. The inner side 51 firstly approaches the tongue partition 65, and because the gap between the arc-shaped surface 653 of the tongue partition 65 and the blade of the impeller 5 is small, the pressure loss is low, a large positive pressure area is formed at the gap between the two, particularly the pressure is large in the extending direction of the first tongue tip portion 654 of the tongue partition 65, and most of the liquid is discharged along the pipeline direction of the first discharge port 61 under the combined action of the rotating centrifugal force of the impeller and the pressure resistance formed by the tongue partition 65; little liquid will pass the first tongue portion 654 and join the liquid which is continuously replenished from the suction inlet 63, and under the action of the rotation of the impeller, the liquid enters the duct with the gap t between the tongue separating portion 65 and the impeller, and when the liquid leaves the second tongue portion 655 of the tongue separating portion 65, the liquid flow rate is high,the pressure is low, and the intersection angle formed by the intersection of the liquid outflow direction and the back line of the water outflow direction of the second discharge port 62 pipeline is an acute angle which is equal to the included angle Q ₂ The angle values, namely greater than or equal to 0 degree and less than or equal to 30 degrees, are larger than or equal to 0 degree and less than or equal to 30 degrees, because cos30 degrees is not less than 0.866, the main component flow direction of the part of liquid which is more than 80 percent deviates from the water outlet direction of the second outlet 62 pipeline, so that large water outlet pressure cannot be formed on the second outlet 62 pipeline, namely the circulating pipeline, cannot discharge water at a low lift, and normal water discharge of a water discharge pipeline is not disturbed. For example, for a drum washing machine, the angle Q can be set ₂ The angle value, the discharge pipeline, the pipeline cross-sectional dimensions of the circulation pipeline, etc. are such that when the centrifugal pump is rotating to discharge water from the discharge pipeline communicating with the first discharge port 61, the circulation pipeline communicating with the second discharge port 62 will have no liquid flow out at the set circulating water nozzle height. Meanwhile, since the left section of the inner peripheral wall 661 connected to the first water introducing part 67 is composed of the spiral curved surface whose curvature radius is continuously increased, the increasing direction of the curvature radius of the spiral curved surface is consistent with the rotation direction of the impeller, in the drainage pipeline formed by the spiral curved surface and the impeller, the kinetic energy of the liquid is continuously converted into pressure energy, and a large drainage pressure is gradually formed, so that the drainage efficiency can be improved, and the drainage lift can be improved under a set flow rate.

Based on the same principle, when the impeller 5 rotates in the counterclockwise direction (seen from the water inlet direction of the suction inlet), the working fluid leaves the water pressing chamber 64 from the second outlet 62 for recirculation, and also little fluid will pass through the second tongue tip 655 to join the fluid continuously replenished from the suction inlet 63 and enter the duct with the gap t between the tongue 65 and the impeller under the rotation of the impeller, and when the fluid leaves the first tongue tip 654 of the tongue 65, the fluid flow rate is high, the pressure is low, and the fluid outflow direction intersects the backward line of the water outlet direction of the duct of the first outlet 61, and the intersection angle formed is an acute angle, and the value of the acute angle is equal to the included angle Q ₁ The angle values, i.e. 15 ° or more and 60 ° or less, are such that the main component flow of the liquid portion is separated from the outlet flow of the first outlet 61 by more than half of the main component flow as cos60 ° =0.5, and thusA large discharge pressure is not generated in the first discharge port 61, and the discharge line connected to the first discharge port 61 does not discharge water because the discharge line has a high head. Taking a drum washing machine as an example, the included angle Q can be set ₁ The angle values, the cross-sectional pipe diameters of the drainage pipes, the circulation pipes, etc. are such that when the impeller rotates to circulate water out of the second outlet 61, the drainage pipes communicating with the first outlet 62 of the centrifugal pump will not flow out at the set height of the drainage head.

The inner circumferential wall 661 of the water compressing portion 66 of another pump cover embodiment is designed as shown in fig. 7, the inner circumferential wall 661 is composed of a section of a spiral curved surface with a curvature radius increasing continuously and a section of an arc curved surface with a curvature radius not changing, a starting point of the arc curved surface is tangent to the inner wall of the second discharge port 62, the starting point of the spiral curved surface is connected to an end point of the arc curved surface and is tangent to a plane passing through the axial center line of the inner cavity 60 and being parallel to the center line of the first discharge port 61 pipe and/or the center line of the second discharge port 62 pipe, and the end point of the spiral curved surface is tangent to the inner wall of the first discharge port 61.

As shown in the pump cover embodiments of fig. 4 and 7, the right side curved surface of the inner peripheral wall 661 of the pressurized water section 66 connected to the second water introducing section 68 has different designs according to different application requirements: 1. the spiral curved surface can be formed by a spiral curved surface with the curvature radius increasing continuously, the increasing direction of the curvature radius of the section of the spiral curved surface is consistent with the rotating direction of the impeller when water is discharged circularly, kinetic energy is converted into pressure energy continuously in a pipeline formed by the section of the spiral curved surface and the impeller, larger pressure is formed step by step, the circulating drainage efficiency can be improved, and the circulating water discharge lift can be improved under the requirement of setting a certain circulating flow rate; 2. the water-saving device is composed of arc-shaped curved surfaces with fixed radiuses, and the design is prone to further improving the drainage efficiency and the drainage lift under the condition of meeting certain circulating water outlet efficiency.

During specific design, the angle value of the included angle Q1 is preferably designed to be larger than the angle value of the included angle Q2, such as Q1=45 degrees, Q2=15 degrees and the like, so that the drainage efficiency of the drainage pipeline and the drainage lift of the drainage pipeline can be considered as much as possible under the condition of meeting a certain circulating pipeline water outlet lift, and the use requirement of a customer on shortening the drainage time of equipment using a centrifugal pump or improving the drainage lift can be better met.

In the pump cover embodiment in which the diaphragm portion 65, the water pressing portion 66 and the pump cover 6 are integrally injection-molded, as shown in fig. 8 and 9, the wall thickness of the water pressing portion at the upper section of the inner cavity 60 needs to be removed due to the requirement of uniformity of the injection wall thickness, so that the outer peripheral profile of the water pressing chamber 64 is adapted to the inner cavity profile of the water pressing chamber 64. The design has simple production process and firm and reliable structure.

The utility model discloses centrifugal pump's impeller can further be designed into as shown preceding formula blade impeller of figure 10, and it includes rim plate and a plurality of blade, is 6 blades in this embodiment, and a plurality of blades set up in one side of rim plate, and the crooked direction of blade is unanimous with impeller drainage direction of rotation F1. Therefore, when the impeller rotates towards the direction F1, the impeller can obtain a larger energy head, and the lift (within a certain designed flow range) during drainage is favorably improved; on the contrary, when the impeller rotates towards the F2 direction, the impeller can obtain a smaller energy head and can also meet the requirement of smaller lift when circulating water. Thus, the requirement of water use with higher lift during water drainage and lower lift during water circulation can be met as much as possible.

Fig. 11 is a schematic structural diagram of the centrifugal pump of the present invention applied to a drum washing machine, wherein the centrifugal pump is connected to each pipeline, the drum washing machine 10 includes a casing 11, an observation window 13 is provided in front of the casing 11 for observing the inner environment of the inner barrel, an annular cavity (not shown) is provided in the circumferential direction of the observation window 13, a plurality of circulating water nozzles are provided in the inner circumference of the annular cavity, the outer barrel 12 is suspended and fixed in the casing 11, the inner barrel (not shown) is rotatably provided in the outer barrel 12, the lower part of the outer barrel 12 is connected with the centrifugal pump of the present invention, a first outlet 61 of the centrifugal pump leads to a washing machine drainage hose 15, washing wastewater is discharged out of the outer barrel 12 through the drainage hose 15, and the drainage lift is high; the second outlet 62 of the centrifugal pump leads to the circulation hose 14 of the washing machine, and the circulation hose 14 is connected to the annular cavity, so that the circulation water conveyed by the circulation hose 14 can be sprayed onto the clothes in the inner barrel through the annular cavity circulation water nozzle, and the circulation water lift is lower than the drainage lift and is generally 2/3 of the drainage lift.

The utility model discloses the centrifugal pump is applicable to other washing equipment equally, for example rotary drum washing machine, dish washer, all-in-one washer dryer etc. and the change of this kind of applied object does not deviate the utility model discloses a principle and scope.

The above embodiments and design examples only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims (10)

1. A centrifugal pump having dual outlet conduits, comprising:

-the impeller (5) is an injection molded semi-open impeller;

the pump cover (6) is provided with an inner cavity (60) with one open end, the inner cavity (60) is provided with a water pumping chamber (64) which surrounds the impeller (5) and plays a role in water guiding, the bottom wall of the inner cavity (60) is provided with a suction inlet (63) which is axially communicated with the water pumping chamber (64), the peripheral wall of the inner cavity (60) is provided with a first discharge port (61) and a second discharge port (62) which are communicated with the water pumping chamber (64), a pipeline which is connected with the two discharge ports protrudes in the same direction of the peripheral wall and is approximately parallel to the peripheral wall, and the water pumping chamber (64) comprises: a baffle tongue part (65) which is positioned between the first discharge port (61) and the second discharge port (62) and protrudes towards the center of the inner cavity (60), and a water pressing part (66) which protrudes towards the center of the inner cavity (60) is arranged on one side corresponding to the baffle tongue part (65);

the novel water-pressing head is characterized in that in a view projected along the central axial direction of the inner cavity (60), the inner circumferential wall (661) of the water-pressing part (66) is formed by tangentially connecting two curved surfaces with different curvature radius change trends, and the inner circumferential wall (661) is tangent to both the inner wall of a pipeline connected with the first discharge port (61) and the inner wall of a pipeline connected with the second discharge port (62).

2. A centrifugal pump with double outlet pipes according to claim 1, wherein the inner peripheral wall of the tongue partition (65) is an arc surface (653), and the center of the arc surface (653) coincides with the center of the inner cavity (60); the tongue-separating portion (65) further comprises two side walls, namely a first side wall (651) adjacent to the first discharge opening (61) and a second side wall (652) adjacent to the second discharge opening (62), the first side wall (651) intersects with the arc-shaped surface (653) to form a first tongue tip portion (654), the second side wall (652) intersects with the arc-shaped surface (653) to form a second tongue tip portion (655), and the first tongue tip portion (654) and the second tongue tip portion (655) are provided with chamfers.

3. Centrifugal pump with double outlet pipes according to claim 2, characterized in that the inner peripheral wall (661) consists of two helical curves with increasing radii of curvature in opposite directions, the two helical curves having their origin in a plane passing through the axial centre line of the chamber (60) and parallel to the centre lines of the first outlet (61) and the second outlet (62) and at a distance R from the centre of the chamber (60) ₁ Then R is ₁ The radius of the arc-shaped surface (653) is larger than that of the arc-shaped surface, the terminal point of the spiral curved surface on one side of the first discharge port (61) is tangent to the inner wall of the pipeline connected with the first discharge port (61), the terminal point of the spiral curved surface on one side of the second discharge port (62) is tangent to the inner wall of the pipeline connected with the second discharge port (62), and the two sections of spiral curved surfaces are tangent at the starting point.

4. Centrifugal pump with double outlet pipes according to claim 2, characterized in that the inner circumferential wall (661) consists of a helical curved surface with increasing radius of curvature and an arc-shaped curved surface with constant radius of curvature, the beginning of the arc-shaped curved surface being tangent to the inner wall of the pipe connecting the second outlet (62), the beginning of the helical curved surface being connected to the end of the arc-shaped curved surface and being tangent to a plane passing through the axial centre line of the chamber (60) and being parallel to the pipe centre line of the first outlet (61) and/or the pipe centre line of the second outlet (62), and the end of the helical curved surface being tangent to the inner wall of the pipe connecting the first outlet (61).

5. The centrifugal pump with double outlet pipes according to claim 2, wherein in a sectional plan view of the first outlet port (61) pipe center line perpendicular to the axial center line of the inner chamber (60), the first side wall (651) passes through an intersection point I1 of the first outlet port (61) pipe inner wall and the inner chamber (60) wall, and intersects the arc-shaped face (653) at an intersection point I2, and a line L1 connecting the intersection point I2 and the center of the inner chamber (60) forms an acute angle Q1 with the transverse center line of the inner chamber (60); in a plane sectional view passing through the pipeline center line of the second discharge port (62) and perpendicular to the axial center line of the inner cavity (60), the second side wall (652) passes through an intersection point I3 of the pipeline inner wall of the second discharge port (62) and the wall of the inner cavity (60) and intersects the arc-shaped surface (653) at an intersection point I4, and a connecting line L2 of the intersection point I4 and the center of the inner cavity (60) forms an acute angle Q2 with the transverse center line of the inner cavity (60).

6. Centrifugal pump with double outlet conduits according to claim 5, characterized in that the value of the Q1 angle satisfies the defining condition: 15 DEG ≦ Q1 ≦ 60 deg.

7. Centrifugal pump with double outlet conduits according to claim 5, characterized in that the value of the Q2 angle satisfies the defining condition: 0 DEG ≦ Q2 ≦ 30 deg.

8. Centrifugal pump with double outlet conduits according to claim 5, characterized in that the angle of the angle Q1 is greater than the angle of the angle Q2.

9. Centrifugal pump with double outlet conduits according to any of claims 1-8, characterized in that the impeller (5) is a forward-vane impeller.

10. A washing apparatus, characterized in that it is equipped with a centrifugal pump with double outlet conduits according to any of claims 1-9.

Images