Centrifugal pump for draining residual water of washing equipment, drainage system and washing equipment
By setting up a small-diameter residual water pipe and siphon structure in the centrifugal pump of the washing equipment, the problem of insufficient water volume in the later stage of drainage is solved, and efficient emptying of residual water is achieved, improving user experience and saving space.
Patent Information
- Application Number
- CN202420140813.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-19
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-01-19
AI Technical Summary
When the water content of the centrifugal pump of the existing washing equipment is too low in the later stage of drainage, the residual water is difficult to discharge, resulting in bacterial growth and odor problems. The existing drain pump is arranged scattered, occupying a lot of space and not tidy, and the user experience is not good.
A centrifugal pump is designed, including an impeller, a motor-driven pump body and a pump cover. A cylindrical water inlet cavity and water inlet pipe are arranged on the outer periphery of the pump cover. A small diameter residual water pipe is arranged at the bottom of the impeller cavity to connect to a siphon hose. Ensure that water can immerse the residual water pipes, form a siphon structure, realize the function of emptying residual water in the pump, and save space, clean and beautiful by optimizing the layout of the drainage pipes and the design of the siphon hose.
It effectively reduces the amount of residual water, prevents bacteria from growing, realizes the function of emptying residual water in the pump, saves takeover space, and improves the user experience.
Smart Images
Figure CN222296502U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a centrifugal pump, a drainage system and a washing device for draining residual water of a washing device, in particular to a washing machine or a dishwasher, and the IPC classification belongs to D06F 39 / 08 and A47L 15 / 42. Background Art
[0002] Generally, washing devices such as washing machines and dishwashers need to be provided with a centrifugal pump to drain the sewage after washing. Among them, some washing devices with upward drainage have a certain height difference between the setting position of the drain pipe orifice and the impeller cavity of the centrifugal pump. Therefore, when the water volume is too small in the later stage of drainage, it is very difficult for this part of the water to be continuously drained by the rotation of the impeller, so it will accumulate inside the impeller cavity of the centrifugal pump. The residual water volume of some upward drainage washing devices can reach 600 milliliters, and a large number of bacteria will breed and generate peculiar smell after long-term use by users. There is a proposed drainage structure for a drum washing machine in the prior art, including a drainage pump, the drainage pump is provided with a first drainage port for initially draining washing water; a second drainage port for draining the residual washing water after draining through the first drainage port; a third drainage port for draining the residual washing water after draining through the first drainage port or the first drainage port and the second drainage port, which can effectively reduce the residual water volume and enable users to drain or empty the residual water more conveniently. However, the drainage ports of this drainage pump are arranged dispersedly, the接管 takes up more equipment space and is not tidy, and manual emptying of the last residual water is required, resulting in a poor user experience.
[0003] Common knowledge and terms can be referred to the "Mechanical Engineering Handbook" and "Electrical Engineering Handbook", the second edition published by China Machine Press in 1997, the national standard GB / T 7021 "Nomenclature for Centrifugal Pumps", and the Chinese patent announcement texts CN104005205B "Drainage Structure and Method for Drum Washing Machine" and CN105673521B "A Drainage Pump Capable of Reducing Air Entrapment in the Initial Stage of Drainage". Summary of the Invention
[0004] In view of the problems and requirements mentioned above, the utility model provides a centrifugal pump for draining residual water of a washing device. The centrifugal pump includes an impeller, a pump body provided with a motor, and a pump cover connected to one end of the pump body to form an impeller cavity for accommodating the impeller. One end of the rotating shaft of the motor is connected to the impeller and drives the impeller to rotate. The pump cover is provided with a cylindrical water inlet cavity, a water inlet pipe protruding radially outward from the outer peripheral diameter of the water inlet cavity away from the pump body, and a first drainage pipe protruding radially outward from the outer peripheral diameter of the impeller cavity adjacent to the pump body. The pump cover also protrudes outward from the bottom end of the outer periphery of the impeller cavity to form a residual water drainage pipe communicating with the impeller cavity. Assuming the inner diameter of the residual water drainage pipe is d, the inner diameter of the first drainage pipe cavity is D, and the distance from the bottom end of the inner wall of the residual water drainage pipe to the outer diameter of the impeller is L, then: d < L and d < D / 2.
[0005] Experiments show that when the centrifugal pump of this design is used in a washing device and connected to its siphon hose to drain residual water, since the residual water discharge pipe is arranged at the bottom end of the outer periphery of the impeller cavity, and the inner diameter d of the residual water discharge pipe is smaller than the distance L from the bottom end of the inner wall of the residual water discharge pipe to the outer diameter of the impeller, the radial cross-sectional area of the inner cavity of the residual water discharge pipe is much smaller than the radial cross-sectional area of the inner cavity of the first drainage pipe. When the water volume decreases in the later stage of drainage, the water stored in the impeller cavity can ensure that the residual water discharge pipe is immersed, and the siphon hose is not easily entered by air. Therefore, by connecting the residual water discharge pipe to the siphon hose of the washing device, the function of draining the residual water in the pump can be achieved.
[0006] In the first embodiment, the residual water pipe is parallel to the placement plane of the washing device. This design is conducive to tangential arrangement of the residual water pipe, which is conducive to residual water drainage and saving pipe connection space.
[0007] In the second embodiment, the bottom end of the inner wall of the residual water discharge pipe is recessed into the inner wall of the impeller cavity, that is, the bottom end of the inner wall of the residual water discharge pipe is lower than the bottom end of the inner wall of the impeller cavity. This design is conducive to ensuring that the water in the impeller cavity submerges the residual water discharge pipe.
[0008] In the third embodiment, the inner diameter d of the residual water discharge pipe is 1 / 3-1 / 5 of the inner diameter D of the first drainage pipe. This parameter design enables the siphon hose connected to the residual water discharge pipe to reliably form a siphon structure, thereby achieving the function of emptying the residual water in the pump.
[0009] In the fourth embodiment, the centrifugal pump is provided with an L-shaped hollow second drainage pipe formed by integral injection molding on the peripheral wall of the first drainage pipe, and the second drainage pipe includes a straight pipe portion and a bent portion, the tail end of the straight pipe portion axially protrudes from the pipe opening plane of the first drainage pipe, the head end of the bent portion radially protrudes from the outer peripheral surface of the first drainage pipe, and the bent portion is connected to the residual water discharge pipe through a connecting pipe. This design can limit the connecting pipe connected to the residual water discharge pipe to the periphery of the centrifugal pump impeller cavity, which is convenient for pre-connecting the pipe and saving the connecting pipe space.
[0010] In the fifth embodiment, the straight pipe portion is parallel to the first drainage pipe and its axial projection is located within the axial projection range of the peripheral wall of the first drainage pipe. This design can place the siphon hose connected to the second drainage pipe inside the drainage hose of the prior art, which is neat and beautiful, saves the space required for the pipe connection, and can protect the siphon hose.
[0011] The utility model provides a drainage system for draining residual water from a washing device, comprising the centrifugal pumps described in the above-mentioned embodiments 1, 2, and 3, and also comprising a siphon hose and a drainage hose, wherein the siphon hose is sleeved and connected to the residual water drainage pipe of the centrifugal pump, and the drainage hose is sleeved and connected to the first drainage pipe, and the distance between the tail end of the siphon hose and the placement plane of the washing device is smaller than the distance between the bottom wall of the inner cavity of the residual water drainage pipe and the placement plane of the washing device. The residual water in the impeller cavity and the water inlet cavity can be drained by forming a siphon structure through the residual water drainage pipe of the above-mentioned centrifugal pump and the siphon hose.
[0012] Another drainage system for draining residual water from washing equipment provided by the utility model includes the centrifugal pump described in the fourth and fifth embodiments above, and also includes a siphon hose and a drainage hose, wherein the siphon hose is inserted into the straight pipe portion connected to the second drainage pipe of the centrifugal pump, the drainage hose is inserted into the first drainage pipe, the siphon hose is placed inside the drainage hose, and the distance between the tail end of the siphon hose and the placement plane of the washing equipment is smaller than the distance between the bottom wall of the inner cavity of the residual water drainage pipe and the placement plane of the washing equipment. The residual water in the impeller cavity and the water inlet cavity can be drained by forming a siphon structure through the residual water drainage pipe of the centrifugal pump, the second drainage pipe, the connecting pipe connected to the residual water drainage pipe, and the siphon hose.
[0013] The utility model also provides a washing device, including a washing machine, a dishwasher and a washer-dryer, which is equipped with any of the above-mentioned drainage systems for draining residual water in a centrifugal pump.
[0014] The technical solution and effects of the utility model will be further explained in the specific implementation manner in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the centrifugal pump of the utility model.
[0016] Figure 2 This is an axial cross-sectional view of the centrifugal pump of the utility model.
[0017] Figure 3 This is a position setting diagram of the first drainage pipeline of the centrifugal pump of the utility model.
[0018] Figure 4 This is another position setting diagram of the first drainage pipe of the centrifugal pump of the utility model.
[0019] Figure 5 It is a structural schematic diagram of the drainage system of the utility model (after the centrifugal pump is installed with a siphon hose and a drainage hose).
[0020] Figure 6 It is a structural schematic diagram of an embodiment of the washing equipment of the utility model.
[0021] Reference numerals
[0022] Centrifugal pump 100, impeller 101, impeller chamber 102, motor 110, rotating shaft 111, pump cover 120, water inlet chamber 121, water inlet pipe 122, residual water discharge pipe 123, first drainage pipe 124, second drainage pipe 125, straight pipe portion 1251, bending portion 1252, connecting pipe 130;
[0023] Washing device 10 , housing 11 , outer tub 12 , drain hose 13 , siphon hose 14 . DETAILED DESCRIPTION
[0024] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0025] As shown in the accompanying drawings, the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. When describing the device, system, equipment, and structure of the utility model, the rotation center of the centrifugal pump motor is the inner side, and the opposite side is the outer side; the side where the washing equipment is placed is the lower side or the lower side, and the opposite side is the upper side or the upper side. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and should not be understood as limiting the utility model.
[0026] A specific embodiment of the centrifugal pump 100 for removing residual water from a washing device according to the utility model is as follows: Figures 1 to 3 As shown, it is improved on the basis of the drainage pump disclosed in the prior art CN105673521B "A drainage pump capable of reducing trapped air in the initial stage of drainage". The centrifugal pump 100 also includes: a pump body containing a motor 110, an impeller 101 connected to one end of a motor shaft 111 and driven by the motor 110, and a pump cover 120 connected to the pump body to form an impeller chamber 102 (accommodating the impeller). The main body of the pump cover 120 is cylindrical, and the inner cavity of the cylindrical shape forms a water inlet chamber 121. A water inlet pipe 122 protrudes radially outward from the outer peripheral area of the water inlet chamber 121 leaving the pump body. A plane M parallel to the placement plane of the washing device is made through the center line of the water inlet chamber 121, and a first drainage pipe 124 protrudes radially outward from the outer peripheral area of the impeller chamber 102 on the upper side of the plane M. The main improvements are as follows:
[0027] At the bottom of the outer peripheral region of the impeller chamber 102 below the plane M, a residual water discharge pipe 123 communicating with the impeller chamber protrudes outward. The residual water discharge pipe 123 can protrude radially from the outer periphery of the impeller chamber, but preferably extends and protrudes parallel to the plane M, so as to form a tangential residual water discharge pipe 123 with the impeller chamber, which is beneficial to discharging residual water and saving the connection pipe space. Assuming that the inner diameter of the residual water discharge pipe 123 is d and the distance from the bottom end of the inner wall of the residual water discharge pipe 123 to the outer diameter of the impeller is L, then d < L. This design can ensure that the water stored in the impeller chamber submerges the residual water discharge pipe, providing a necessary condition for forming a siphon structure subsequently. To be more conducive to the water stored in the impeller chamber submerging the residual water discharge pipe, the bottom end of the inner wall of the residual water discharge pipe can be recessed from the inner wall of the impeller chamber, that is, the bottom end of the inner wall of the residual water discharge pipe is lower than the bottom end of the inner wall of the impeller chamber.
[0028] Further, on the peripheral wall of the first drain pipe 124, a second drain pipe 125 which is L-shaped and hollow and integrally injection-molded with it can be provided. The second drain pipe 125 includes a straight pipe portion 1251 and a bent portion 1252. The inner cavity diameters of the straight pipe portion 1251 and the bent portion 1252 are the same as the inner cavity diameter d of the residual water discharge pipe. The straight pipe portion 1251 is preferably parallel to the first drain pipe 124 and located within the axial projection range of the first drain pipe 124. The tail end of the straight pipe portion 1251 axially protrudes from the pipe orifice plane of the first drain pipe 124, and the head end of the bent portion 1252 radially protrudes from the outer peripheral surface of the first drain pipe 124. The head end of the bent portion 1252 is communicated with the residual water discharge pipe 123 by a connecting pipe 130.
[0029] The installation position of the first drain pipe of the centrifugal pump of the present utility model can be as Figure 3 shown, with its center line vertically placed, or as Figure 4 shown, with its center line inclined at an angle K with the plane M. In short, the center line of the first drain pipe 124 is not lower than the plane M, and it is okay to be located on the plane M or above it.
[0030] Figure 5 As shown in the figure is a specific implementation manner of the drainage system formed after installing the siphon hose and the drain hose for the centrifugal pump of the present utility model, including a centrifugal pump 100, a drain hose 13 and a siphon hose 14. The head end of the siphon hose 14 is connected to the tail end of the straight pipe portion 1251 of the second drain pipe 125 of the centrifugal pump. The head end of the drain hose 13 is sleeved into the first drain pipe 124. The siphon hose 14 is arranged in an inverted U shape. According to Figure 5As shown in the orientation, the left vertical water inlet section of the inverted U-shaped siphon hose 14 is now called the upstream section, the middle arc section is called the midstream section, and the right vertical water outlet section is called the downstream section. The upstream section of the siphon hose 14 extends upward in the shell of the washing device following the arrangement of the drain hose 13, the midstream section of the siphon hose 14 bends downward and extends along the arc, the downstream section of the siphon hose 14 is connected to the water outlet side of the midstream section and extends downward until the distance between the tail end of the siphon hose 14 and the placement plane of the washing device is less than the distance between the bottom wall of the inner cavity of the residual water discharge pipe 123 and the placement plane of the washing device, that is, the tail end of the siphon hose 14 is lower than the bottom wall of the inner cavity of the residual water discharge pipe 123, as shown in FIG. Figure 5 As shown, the distance H>0mm. Preferably, the tail end of the drain hose 13 is not higher than the tail end of the siphon hose 14, so that the drain hose 13 can completely surround the siphon hose 14, which is neat and beautiful.
[0031] In other modified embodiments, the centrifugal pump is not provided with a second drainage pipe 125. In this case, the head end of the siphon hose 14 is directly connected to the residual water drainage pipe 123 (not shown). Similarly, the siphon hose 14 is arranged in the shell of the washing device and extends upward following the arrangement of the drainage hose 13. The midstream section of the siphon hose 14 is bent downward and extended along an arc. The downstream section of the siphon hose 14 is connected to the water outlet side of the midstream section and extends downward to the tail end of the siphon hose 14 below the bottom wall of the inner cavity of the residual water drainage pipe 123.
[0032] Figure 6 The present invention is a schematic diagram of the structure of a drum washing machine in which the drainage system of the present invention is applied to a washing machine, which shows the connection between the centrifugal pump and various pipelines. The drum washing machine 10 includes a shell 11, an outer drum 12 is suspended and fixed in the shell 11, an inner drum (not shown) is rotatably arranged in the outer drum 12, and a centrifugal pump of the present invention is installed at the lower part of the outer drum 12 (or the base of the washing device). The first drainage pipe 124 of the centrifugal pump is connected to the drainage hose 13 of the washing machine, and the washing waste water is discharged from the outer drum 102 through the drainage hose 13 and the siphon hose 14 (not shown) built in the drainage hose 13. The head end of the siphon hose 14 is connected to the second drainage pipe 125 of the centrifugal pump, and the height of the end of the siphon hose 14 is lower than the bottom end of the inner cavity of the residual water discharge pipe 123 of the centrifugal pump.
[0033] Since the washing equipment has a certain amount of water storage, in order to save drainage time, the inner cavity diameter D of the first drainage pipe 124 of the centrifugal pump is generally designed to be larger (about 16mm-30mm). In this way, in the later stage of drainage, due to water vapor mixing and other reasons, the rotation of the impeller cannot continue to discharge the washing water from the first drainage pipe 124. In order to empty the residual water in the impeller chamber, the inner cavity radial cross-sectional area of the residual water drainage pipe 123 is generally designed to be much smaller than the inner cavity radial cross-sectional area of the first drainage pipe 124. Experiments show that when the inner diameter d of the residual water drainage pipe 123 is less than D / 2, in the later stage of drainage, the washing water can continue to be discharged from the washing equipment from the residual water drainage pipe 123 via the siphon hose 14. When the inner diameter d of the residual water drainage pipe 123 is 1 / 3-1 / 5 of the inner cavity diameter D of the first drainage pipe 124, the residual water drainage pipe 123 and the siphon hose 14 can reliably form a siphon structure with a siphon function, thereby emptying the residual water in the centrifugal pump.
[0034] The centrifugal pump and drainage system of the utility model are also applicable to other washing equipment, such as pulsator washing machines, dishwashers, integrated washing and drying machines, etc. Such changes in the application objects do not deviate from the principle and scope of the utility model.
[0035] The above-mentioned embodiments and design examples only express several implementation methods of the utility model, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.
Claims
1. A centrifugal pump for draining residual water from a washing device, the centrifugal pump (100) comprising an impeller (101), a pump body provided with a motor (110), a pump cover (120) connected to one end of the pump body to form an impeller chamber (102) for accommodating the impeller (101), one end of a rotating shaft (111) of the motor being connected to the impeller (101) and driving the impeller to rotate, the pump cover (120) being provided with a cylindrical water inlet chamber (121), a water inlet pipe (122) protruding radially outward from the outer periphery of the water inlet chamber (121) away from the pump body, and a first drainage pipe (124) protruding radially outward from the outer periphery of the impeller chamber (102) adjacent to the pump body, characterized in that , the pump cover (120) further protrudes outward at the bottom end of the outer periphery of the impeller chamber (102) to form a residual water discharge pipe (123) communicating with the impeller chamber (102). Let the inner diameter of the residual water discharge pipe (123) be d, the inner cavity diameter of the first drainage pipe (124) be D, and the distance from the bottom end of the inner wall of the residual water discharge pipe (123) to the outer diameter of the impeller be L. Then: d < L and d < D / 2.
2. The centrifugal pump for draining residual water from a washing device according to claim 1, characterized in that: The center line of the residual water discharge pipe (123) is parallel to the placement plane of the washing device.
3. The centrifugal pump for draining residual water from a washing device according to claim 1, characterized in that: The bottom end of the inner wall of the residual water discharge pipe (123) is recessed into the inner wall of the impeller chamber, that is, the bottom end of the inner wall of the residual water discharge pipe (123) is lower than the bottom end of the inner wall of the impeller chamber (102).
4. The centrifugal pump for draining residual water from a washing device according to claim 1, characterized in that: The inner diameter d of the residual water discharge pipe (123) is 1 / 3 - 1 / 5 of the inner cavity diameter D of the first drainage pipe (124).
5. The centrifugal pump for draining residual water from a washing device according to claim 1, characterized in that: An L-shaped hollow second drainage pipe (125) integrally injection-molded with the first drainage pipe (124) is provided on the peripheral wall of the first drainage pipe (124). The second drainage pipe (125) includes a straight pipe portion (1251) and a bent pipe portion (1252). The inner cavity diameters of the straight pipe portion (1251) and the bent pipe portion (1252) are both d. The tail end of the straight pipe portion (1251) axially protrudes from the pipe orifice plane of the first drainage pipe (124). The head end of the bent pipe portion (1252) radially protrudes from the outer peripheral surface of the first drainage pipe (124). The bent pipe portion (1252) communicates with the residual water discharge pipe (123) through a connecting pipe (130).
6. The centrifugal pump for draining residual water from a washing device according to claim 5, characterized in that: The straight pipe portion (1251) is parallel to the first drainage pipe (124) and its axial projection is within the axial projection range of the first drainage pipe (124).
7. A drainage system for draining residual water from a washing device, characterized in that: Including the centrifugal pump (100), siphon hose (14) and drainage hose (13) according to any one of claims 1 - 4, the siphon hose (14) is connected to the residual water discharge pipe (123) of the centrifugal pump, the drainage hose (13) is connected to the first drainage pipe (124), and the distance from the tail end of the siphon hose (14) to the placement plane of the washing device is less than the distance from the inner cavity bottom wall of the residual water discharge pipe (123) to the placement plane of the washing device.
8. A drainage system for draining residual water from a washing device, characterized in that: Including the centrifugal pump (100), siphon hose (14) and drainage hose (13) according to claim 5 or 6, the siphon hose (14) is connected to the straight pipe portion (1251) of the second drainage pipe (125) of the centrifugal pump, the drainage hose (13) is connected to the first drainage pipe (124), the siphon hose (14) is placed inside the drainage hose (13), and the distance from the tail end of the siphon hose (14) to the placement plane of the washing device is less than the distance from the inner cavity bottom wall of the residual water discharge pipe (123) to the placement plane of the washing device.
9. A washing device, characterized in that: Configured with the drainage system for discharging residual water of the washing device according to claim 7 or 8.