CN217558572U - Centrifugal pump with double water outlet pipelines and washing equipment applying centrifugal pump - Google Patents

Abstract

The utility model provides a centrifugal pump with two outlet conduit, including the pump cover, have the open-ended inner chamber of one end, the inner chamber is equipped with the pressurized-water chamber that plays the water guide effect around the impeller, the pressurized-water chamber including be located between first exhaling mouth and the second exhaling mouth to the convex tongue portion that separates in inner chamber center, separate the both sides wall terminal point of tongue with the line at inner chamber center with the horizontal central line of inner chamber forms acute angle Q1 and acute angle Q2 respectively, and Q1's angle value is greater than Q2's angle value. Also provides a washing device applying the centrifugal pump. The design of the tongue partition enables most of liquid to be discharged along the discharge pipe 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, and the other discharge pipe cannot discharge water under the set lift, so that the normal drainage of the discharge pipe facing the rotation direction of the impeller is not interfered, the phenomenon of water mixing is avoided, and the drainage efficiency is high.

Description

Centrifugal pump with double water outlet pipelines and washing equipment applying 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 used water of recycling of washing equipment, especially washing machine or dish washer, and the IPC is categorised belongs to D06F 39/08.

Background

In general, washing equipment such as a washing machine and a dishwasher 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 degree of washing of the laundry, a water circulation system is often provided in the washing machine to pump out and spray the washing water in the water drum of the washing machine onto the laundry, and therefore, another drain pump dedicated to achieving water circulation is often provided in the washing machine. The prior art of the drainage pump is shown in the Chinese patent application with the publication numbers of CN202954990U, CN202954989U, CN202602396U, CN202550703U, CN102182711A, CN102223011A and CN102094832A of the applicant.

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. When a certain pipeline is drained, how to avoid the phenomenon of water cross caused by a small amount of water entering another pipeline for drainage needs to be further provided.

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

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 with one open end, the upper section of the inner cavity is provided with a water pressing chamber surrounding the impeller and playing a role in guiding water, the bottom wall of the upper end of the inner cavity is provided with a suction inlet axially communicated with the water pressing chamber, the peripheral wall of the inner cavity is provided with a first discharge port and a second discharge port communicated with the water pressing chamber, a pipeline 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 pressing chamber comprises: the tongue separating part is positioned between the first discharge port and the second discharge port and protrudes towards the center of the inner cavity, the peripheral wall of the tongue separating part is an arc-shaped surface, the circle center of the arc-shaped surface is superposed with the center of the inner cavity, the tongue separating part is also 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 is intersected with the arc-shaped surface to form a first tongue tip part, and the second side wall is intersected with the arc-shaped surface to form a second tongue tip part;

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

The design of the tongue partition ensures that most of liquid is discharged along the discharge pipeline facing to 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 enters the pipeline between the tongue partition and the impeller, the liquid has high flow speed and low pressure when flowing out of the tongue partition, and the main component flow direction deviates from the water discharge direction of the other discharge pipeline, so that large water discharge pressure cannot be formed for the other discharge pipeline. The angle value of the included angle Q1 is designed to be larger than the angle value of the included angle Q2, so that the pipeline drainage efficiency and the drainage lift of the first discharge port can be improved as much as possible under the condition that the pipeline water outlet lift of the second discharge port is met, and the use requirements of customers on shortening of drainage time or high-position water outlet are met.

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 the liquid portion is more than half of the flow direction and the direction of the water outlet of the first outlet 61 pipe are deviated, so that a large water outlet pressure is not formed in the first outlet 61 pipe, and the water outlet pipe does not discharge water because the set head of the water outlet pipe communicating with the first outlet 61 is high.

Preferably, the Q2 angle value satisfies the defining condition: 0 DEG ≦ Q2 ≦ 30 deg. Because cos30 ° =0.866, the main component flow direction of the part of liquid more than 80% deviates from the water outlet direction of the second spout 62 pipeline, so that larger water outlet pressure cannot be formed on the second spout 62 pipeline, namely the circulating pipeline, cannot discharge water under lower lift, normal water discharge of a water discharge pipeline is not disturbed, and the normal water discharge efficiency of the water discharge pipeline is higher.

Furthermore, the pressurized-water chamber still includes the convex pressurized-water portion of setting in the corresponding one side of tongue portion that separates to the inner chamber center, the height of pressurized-water portion and the high parallel and level of tongue portion that separate, in the view along inner chamber axial centerline projection, the internal perisporium of pressurized-water portion and the inner wall of first exhalant canal and second exhalant canal are all tangent.

Preferably, the inner peripheral 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 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 is set as R ₁ Then R is ₁ The radius of the spiral curved surface is larger than that of the arc-shaped surface, 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, 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, and the two sections are tangent at the starting point.

In the pipeline formed by the spiral curved surfaces and the impeller, kinetic energy is continuously converted into pressure energy, larger drainage pressure is gradually formed, the drainage efficiency can be improved, and the drainage efficiency of drainage and circulating water can be simultaneously considered by a water pressing part consisting of two sections of spiral curved surfaces with opposite increasing directions of curvature radius.

Preferably, the curved surface comprises a section of spiral curved surface with a curvature radius which is continuously increased and a section of arc curved surface with a constant curvature radius, the starting point of the arc curved surface is tangent with the inner wall of the second discharge port, the starting point of the spiral curved surface is connected with the end point of the arc curved surface and is tangent on a plane which passes through the axial center line of the inner cavity 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 end point of the spiral curved surface is tangent with the inner wall of the first discharge port.

Preferably, the curved surface is a single spiral curved surface with a continuously increasing curvature radius, a starting point with the smallest curvature radius is formed at the tangent position of the spiral curved surface and the inner wall of the second discharge opening, and an end point with the largest curvature radius is formed at the tangent position of the spiral curved surface and the inner wall of the first discharge opening.

The design of the pressurized-water part with the one-way curvature radius continuously-increased circumferential curved surface can improve the drainage efficiency of the side of the drainage pipeline and the drainage lift of the drainage pipeline as much as possible under the condition of meeting a certain circulating water outlet lift, and meets the use requirement of customers on shortening the drainage time or high drainage lift.

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 integrated machine, it disposes the centrifugal pump that has two outlet conduit that possesses arbitrary above-mentioned technical characteristics. 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 port, 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 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. The drainage phenomenon that drainage pipeline and circulating line go out water simultaneously can not take place for this design, does not produce the phenomenon of crossing water promptly, consequently all is higher from drainage pipeline and circulating line's drainage efficiency.

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 a front view of pump cover embodiment 3 of the centrifugal pump of the present invention.

Fig. 9 is an axial sectional view of pump cover embodiment 4 of the centrifugal pump of the present invention.

Fig. 10 is a cross-sectional view taken along line D-D of fig. 9.

Figure 11 is a radial cross-sectional view of centrifugal pump embodiment 2 of the present invention.

Fig. 12 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 isolation 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 circulation 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; a pipeline connected with the first discharge port is used as a first discharge port pipeline and a drainage pipeline; the pipeline connected with the second discharge port is used as a second discharge port pipeline and also used as 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 drawings are exemplary only for the purpose of 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 term "water" appears in the names of some components in the present invention, such as "pumping chamber", "drainage pipe", etc., it does not mean that the working fluid in the present invention is necessarily water, and may be used to introduce or discharge other working fluids besides water.

Fig. 1 is an axial sectional view ofbase:Sub>A centrifugal pump embodiment 1 of the present invention through an 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 fig. 2, the centrifugal pump includes:

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 be 3, 5 or 6, and the adoption of odd-numbered blades is more beneficial to reducing vibration noise);

the pump cover 6 is provided with an inner cavity with an open end, the opening of the inner cavity is an inner cavity 60, 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 discharge port 61 and a second discharge port 62 which are communicated with the water pumping chamber 64;

a pump body 7 that supports and/or encloses 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, referring to fig. 2 by way of example only, the pipe connecting the first discharge port 61 and the pipe connecting the second discharge port 62 are disposed in the same direction, i.e., both extend outward in the same direction from the peripheral wall of the pump cover 6 cylindrical rotation body, and the pipe center lines (not shown) 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, the interior of the pump cover 6 is hollow to form an inner cavity with an opening at one end, the opening of the inner cavity is an inner cavity 60, a suction port 63 is disposed at 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 upwards along the periphery of the suction port 63; a first discharge port 61 and a second discharge port 62 which are communicated with the inner cavity 60 are respectively arranged on the peripheral wall of the inner 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 to the outside of the peripheral wall along the periphery of the first discharge port; 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 baffle 65 projecting toward the center of the inner chamber 60 on the side adjacent to the discharge opening, the baffle 65 is the same as the bottom wall of the inner chamber 60, the top end of the baffle 65 is approximately flush with the duct wall of the first discharge opening 61 with a larger cross-sectional area, and the distance between the baffle 65 and the duct wall is preferably not more than 2mm. The tongue 65 of the present 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 the anti-interference gap t is 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: 0.015D2 ≤ t ≤ 0.04D2, where D2 is the outer diameter of the impeller, the diameter of the circle where the arc face 653 is located is equal to the diameter D3 of the base circle, and D3= (1.03-1.08) D2.

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 intersects the arcuate face 653 to form a first toe portion 654, the second sidewall 652 intersects the arcuate face 653 to form a second toe portion 655, and both the first toe portion 654 and the second toe portion 655 are chamfered, preferably radiused. 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 of the inner cavity corresponding to the tongue portion 65, the pressurized water portion 66 is also the same as the bottom wall of the inner cavity 60, and the height thereof is 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 first discharge port 61 and the inner wall of the second discharge port 62, and in the embodiment shown in fig. 4, the inner circumferential wall 661 is composed of two helical curved surfaces with increasing radii of curvature in opposite directions, the two helical 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 first discharge port 61 and/or the center line 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 end point of the spiral curved surface at one side of the first discharge port 61 is tangent to the inner wall of the pipeline of the first discharge port 61, the end point of the spiral curved surface at one side of the second discharge port 62 is tangent to the inner wall of the pipeline of the second discharge port 62, and the two sections of spiral curved surfaces are tangent at the starting points. The press section 66 of the present embodiment is separately formed and fixed to the inner chamber 60. 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. In other embodiments, water press 66 may be integrally injection molded with pump cap 6.

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 inner 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 formed in an arc shape.

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 discharging the centrifugal pump of the present invention will be described by taking the pressurized-water portion 66 of the inner peripheral wall 661 formed of 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 views in fig. 4 and 6 (in the direction opposite to the suction port water intake direction), the working fluid (particularly, 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 cross the first tongue tip portion 654 and join the liquid which is continuously supplemented from the suction inlet 63, under the rotation action of the impeller, the liquid enters the pipe with the gap t formed by the tongue separating portion 65 and the impeller, when the part of the liquid leaves the second tongue tip portion 655 of the tongue separating portion 65, the liquid flow rate is high, the pressure is small, the intersection angle formed by the intersection of the liquid outflow direction and the back line of the water outlet direction of the pipe of the second outlet 62 is an acute angle, and the value of the acute angle 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 rotated 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, because the left section of the inner peripheral wall 661 connected with the first water-introducing part 67 is composed of the spiral curved surface with the curvature radius increasing continuously, the increasing direction of the curvature radius of the spiral curved surface is consistent with the rotating 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, so that a larger drainage pressure is formed step by step, the drainage efficiency can be improved, and the drainage lift can be further improved under the condition of setting a certain flow requirement.

Based on the same principle, when the impeller 5 rotates in the counterclockwise direction (seen from the water inlet direction of the suction port), the working fluid leaves the pumping 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 supplemented from the suction port 63 and enter the duct with the gap t formed between the tongue 65 and the impeller under the rotation action of the impeller, and when the part of 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 with the backward line of the water outlet direction of the duct of the first outlet 61, and the formed intersection angle is an acute angle, and the acute angle value is equal to the included angle Q ₁ The angle values, i.e., 15 ° or more and 60 ° or less, are set to be equal to or greater than the angle values, i.e., 60 ° or less, and cos60 ° =0.5, so that the main component flow of the liquid portion, which is half or more, deviates from the discharge direction of the first discharge port 61 pipe, and thus a large discharge pressure is not generated in the first discharge port 61 pipe, and the discharge water is discharged because the set lift of the discharge pipe communicating with the first discharge port 61 is highThe pipeline can not discharge water. Taking a drum washing machine as an example, the included angle Q can be set ₁ The angle values, the pipe cross-sectional dimensions of the discharge pipes, the circulation pipes, etc. are such that when the impeller rotates to circulate water out of the second discharge opening 61, the discharge pipes communicating with the first discharge opening 62 of the centrifugal pump are free from liquid outflow at a set discharge head height.

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 with an end point of the arc curved surface and is tangent to a plane passing through the 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 scene 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.

In still another pump cover embodiment, as shown in fig. 8, the inner circumferential wall 661 of the water-pressing portion 66 may be formed of a single-stage spiral curved surface whose radius of curvature gradually increases in the direction of rotation of the impeller during water discharge, and the point of contact with the inner wall of the second discharge port 62 may be a starting point where the radius of curvature is smallest, and the point of contact with the inner wall of the first discharge port 61 may be an ending point where the radius of curvature is largest. This design can form great drainage pressure, further promotes drainage efficiency, improves the drainage lift, considers promotion drainage efficiency and improvement drainage lift as far as possible satisfying under certain circulation play water lift circumstances, can better satisfy the customer and experience the use that shortens drainage time or high drainage lift.

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. 9 and 10, 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 fig. 11, 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 of higher lift during water drainage and lower lift during water circulation can be met.

Fig. 12 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, washing and drying all-in-one etc. and the change of this kind of applied object is not skew the utility model discloses a principle and scope.

The above embodiments and design examples only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not 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 (9)

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 is provided with a water pressing chamber (64) which surrounds the impeller (5) and plays a role in guiding water, the bottom wall of the inner cavity is provided with a suction inlet (63) which is axially communicated with the water pressing chamber (64), the peripheral wall of the inner cavity is provided with a first discharge port (61) and a second discharge port (62) which are communicated with the water pressing 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 pressing chamber (64) comprises: the tongue partition part (65) is positioned between the first discharge opening (61) and the second discharge opening (62) and protrudes towards the center of the inner cavity (60), the inner peripheral wall of the tongue partition part (65) is an arc-shaped surface (653), the center of the arc-shaped surface (653) is coincident with the center of the inner cavity (60), the tongue partition part (65) is also provided with 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) is intersected with the arc-shaped surface (653) to form a first tongue tip part (654), and the second side wall (652) is intersected with the arc-shaped surface (653) to form a second tongue tip part (655);

in a plane sectional view of the pipeline central line of the first discharge port (61) and perpendicular to the axial central line of the inner cavity (60), the first side wall (651) passes through an intersection point I1 of the pipeline inner wall of the first discharge port (61) and the wall of the inner cavity (60) and intersects with the arc-shaped surface (653) at an intersection point I2, and a connecting line L1 of the intersection point I2 and the center of the inner cavity (60) forms an acute angle Q1 with the transverse central line of the inner cavity (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 with the arc-shaped surface (653) at an intersection point I4, 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), and the acute angle Q1 is larger than the acute angle Q2.

2. Centrifugal pump with double outlet conduits according to claim 1, characterized in that the value of the Q1 angle satisfies the defining condition: 15 DEG ≦ Q1 ≦ 60 deg.

3. Centrifugal pump with double outlet conduits according to claim 1, characterized in that the value of Q2 angle satisfies the defining condition: 0 DEG ≦ Q2 ≦ 30 deg.

4. The centrifugal pump with the double water outlet pipes as claimed in claim 1, wherein the pumping chamber (64) further comprises a pumping part (66) which is arranged on one symmetrical side of the tongue partition (65) and protrudes towards the center of the inner cavity (60), the axial height of the pumping part (66) is flush with that of the tongue partition (65), and the inner circumferential wall (661) of the pumping part (66) is tangential to both the inner pipe wall of the first outlet port (61) and the inner pipe wall of the second outlet port (62) in a view projected axially along the center line of the inner cavity (60).

5. Centrifugal pump with double outlet ducts according to claim 4, characterized in that said inner peripheral wall (661) is formed by two helical curved surfaces with increasing radius of curvature in opposite directions, the starting points of which are located on a plane passing through the axial centre line of said inner chamber (60) and parallel to the centre lines of the ducts of the first outlet (61) and the second outlet (62), at a distance R from the centre of said inner chamber (60) ₁ Then R is ₁ The radius of the arc-shaped surface (653) is larger, the terminal point of the spiral curved surface at 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 at 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.

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

7. A centrifugal pump with double outlet pipes according to claim 4, characterized in that the inner peripheral wall (661) is a single helical surface with increasing radius of curvature, the point where the helical surface is tangent to the inner wall of the second outlet (62) is the starting point with the smallest radius of curvature, and the point where the helical surface is tangent to the inner wall of the first outlet (61) is the ending point with the largest radius of curvature.

8. Centrifugal pump with double outlet conduits according to any of claims 1-7, characterized in that the impeller (5) is a forward-vane impeller.

9. Washing installation, characterized in that it is equipped with a centrifugal pump with double outlet conduits according to any of claims 1-8.

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