Pump for washing device

Abstract

The present invention discloses a pump for a washing device, comprising a pump body; the pump body forms a pump cavity for containing liquid by means of a first pump shell and a second pump shell that are fastened together; the pump body is provided with a liquid inlet and a liquid outlet that are connected to the pump cavity; the pump cavity is provided with an impeller that is connected to a motor; it also includes a second pressure switch that is provided at the liquid outlet of the pump body and senses the liquid flowing through the liquid outlet; a heating component that extends from the outside of the pump body into the pump cavity and heats the liquid in the pump cavity; the impeller divides the pump cavity into a first chamber close to the liquid inlet and a second chamber away from the liquid inlet; the heating component is provided in the second chamber; and a circulation hole that is provided on the impeller body and allows the liquid in the second chamber to flow back to the impeller and flow out from the liquid outlet. The present invention provides a pump for a washing device, which reduces the volume of the pump body, improves the structure of the impeller, improves the flow field in the pump cavity, and changes the structure of the heating component so that the thermal field in the pump cavity becomes more uniform.

Description

Technical Field

[0001] The invention belongs to the technical field of household appliances, and in particular relates to a pump for a washing device. Background Art

[0002] With the improvement of living standards, consumers have higher and higher requirements for the quality of life, and thus higher and higher requirements for product quality, performance, humanization of use, intelligent operation and other aspects. As an excellent product, dishwashers have gradually entered people's lives. At present, dishwasher technology generally uses a heating pump that integrates washing and heating functions. The pump body with heating function usually includes upper and lower pump shells, an impeller installed in the pump shell, a motor for driving the impeller to rotate, and a heating body for heating the fluid. Several existing heating pumps, in a type of household appliance application scenario used for liquid drive and continuous circulation heating, require a compact liquid drive and heating component. The heating body is installed inside the pump shell or is a separate part of the pump shell (such as the upper pump shell or the lower pump shell). The heating body installed inside the pump shell, such as the annular heating tube, needs to be wound between the outer side of the impeller and the pump shell, which increases the pump shell area and reduces the pump efficiency. At the same time, the safety protection device measures of the heating tube itself are missing, and it cannot pass the test under abnormal conditions, such as the dry burning experiment of the heating tube. In addition, for a heating pump in which the heating element is a part of the pump casing, the pump casing needs to have good sealing and heat resistance, and the sealing structure of the pump casing and the heating tube is generally more complicated, and the comprehensive cost of parts manufacturing and assembly is higher.

[0003] A Chinese patent with application number CN201810240903.5 discloses a heating pump for a dishwasher and a dishwasher having the heating pump for a dishwasher, wherein the heating pump for a dishwasher comprises: a pump casing having a heating pump cavity therein, the heating pump cavity having an inlet and an outlet; a motor having a rotating shaft and connected to the pump casing, the rotating shaft extending into the heating pump cavity; an impeller, the impeller being in the heating pump cavity and mounted on the rotating shaft, the impeller comprising a main body and an extension portion, the diameter of the extension portion being smaller than the diameter of the main body portion; a heating assembly, the heating assembly comprising a heating tube, a fuse and a heating wire arranged in the heating tube; the heating assembly is placed between the inlet and the impeller, the inner diameter of the arc segment is larger than the outer diameter of the impeller extension portion, and the inner diameter of the arc segment is smaller than the outer diameter of the main body portion.

[0004] A Chinese patent with application number CN201810143548.X discloses a heat collector pump and a dishwasher, wherein the heat collector pump includes: a pump housing having a pump cavity, and the upper end of the pump housing has a water inlet and a water outlet; a partition, which is arranged in the pump cavity and divides the pump cavity into a primary pump cavity and a secondary pump cavity, the secondary pump cavity is located above the primary pump cavity, and a first spiral diffuser flow channel located in the primary pump cavity is formed on the partition, and a flow channel outlet connected to the secondary pump cavity is provided at the end of the first spiral diffuser flow channel, and the top wall of the first spiral diffuser flow channel is at least partially connected to the secondary pump cavity; the secondary pump cavity is connected to the water outlet; a heating element is arranged in the secondary pump cavity; an impeller is arranged in the primary pump cavity; and a connecting element, which is used to connect the water inlet with the primary pump cavity.

[0005] Although the above-mentioned prior art has proposed technical solutions to the problems of preventing dry burning of the heating pump and the large volume and efficiency of the pump body, there are still problems such as low efficiency and poor flow uniformity when the liquid circulates in the pump body; the heating component occupies too much space in the pump body; there are technical defects in the setting of the heating tube part of the heating component, which leads to uneven heating or excessive local stress caused by thermal coupling, affecting the life of the heating tube.

[0006] Therefore, it is necessary to improve the shortcomings and defects of the prior art and provide a pump for a washing device that can reduce the volume of the pump body and increase the washing accommodation space of the washing device while ensuring the function of the pump body. At the same time, by improving the structure of the impeller, the flow condition in the pump chamber is improved to make the flow more uniform, reduce the impact on the chamber wall, and extend the service life of the pump body. By changing the structure of the heating component, the thermal field in the pump chamber becomes more uniform, avoiding the problems caused by thermal coupling.

[0007] In view of this, the present invention is proposed. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a pump for a washing device that can overcome the above problems or at least partially solve the above problems.

[0009] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a pump for a washing device, comprising

[0010] Pump body;

[0011] The pump body forms a pump chamber for containing liquid by means of the first pump shell and the second pump shell that are fastened together;

[0012] The pump body is provided with a liquid inlet and a liquid outlet which are connected with the pump chamber;

[0013] An impeller connected to the motor is arranged in the pump chamber;

[0014] Also includes

[0015] A second pressure switch disposed at the liquid outlet of the pump body and sensing the liquid flowing through the liquid outlet;

[0016] A heating component extending from the outside of the pump body into the pump cavity to heat the liquid in the pump cavity;

[0017] The impeller divides the pump chamber into a first chamber close to the liquid inlet and a second chamber far from the liquid inlet;

[0018] The heating component is disposed in the second chamber;

[0019] A circulation hole is arranged on the impeller body to allow the liquid in the second chamber to flow back to the impeller and out of the liquid outlet.

[0020] Among them, the

[0021] The liquid flows into the pump chamber through the liquid inlet, flows through the impeller and the heating component in sequence, and then flows out from the liquid outlet;

[0022] In one embodiment, the projection of the liquid outlet in the pump chamber at least covers the impeller and part of the heating component. By covering the impeller and the heating component, the deposited liquid in the second chamber is effectively circulated, avoiding excessive deposition of liquid in the second chamber causing poor circulation in the flow basin, thereby affecting the use of the pump body.

[0023] In addition, the

[0024] The impeller comprises a first wheel body which is adapted to the shape of the first pump casing and a second wheel body on which blades are installed;

[0025] The first wheel body is provided with a water inlet corresponding to the liquid inlet;

[0026] On the second wheel body, at least one circulation hole is provided between the two blades;

[0027] A liquid outlet cavity is formed between the first wheel body and the second wheel body;

[0028] By redefining the impeller structure, the liquid flow area in the pump chamber has been replanned, the liquid flow in the pump chamber is more uniform, and the impact on the chamber wall caused by too many corners is avoided.

[0029] Furthermore, the liquid flows into the impeller through the liquid inlet, forming a drainage along the blades.

[0030] A first water path flowing through the liquid outlet cavity and out of the liquid outlet;

[0031] The liquid flows through the liquid outlet cavity, enters the second cavity, and flows back to the liquid outlet cavity from the circulation hole provided on the second wheel body, and finally converges to the second waterway where the first waterway flows out from the liquid outlet;

[0032] At the same time, by setting a second water path from the circulation hole at the bottom of the impeller to the inside of the impeller, the heating component can heat the liquid while making the flow field in the pump chamber more reasonable, realizing the integration of suction and discharge. At the same time, the space occupied by the impeller and the heating component in the pump chamber is reduced, so that the volume of the pump body is reduced.

[0033] In one embodiment, the diameter of the circulation hole is greater than or equal to 5% of the impeller diameter.

[0034] Furthermore, the

[0035] The liquid inlet includes a drainage wall extending into the pump cavity;

[0036] The drainage arm extends into the water inlet provided on the first wheel body to guide the liquid flowing through the liquid inlet into the liquid outlet cavity of the impeller;

[0037] By setting a drainage arm structure between the impeller and the liquid inlet of the pump body, the liquid can flow directly into the impeller, avoiding the need to set a drainage structure that is too high, too large or too complicated on the impeller. At the same time, the shape between the impeller and the pump body is structurally suitable, which greatly reduces the gap between the impeller and the pump body, thereby further reducing the volume of the pump body.

[0038] Furthermore, the

[0039] At least one protrusion is arranged at intervals on one side of the blade facing the first wheel body;

[0040] Corresponding to the protrusions arranged on the blades, corresponding small holes are arranged on the first wheel body

[0041] When the first wheel body and the second wheel body are buckled, the protrusion passes through the small hole, and after melting treatment, the first wheel body and the second wheel body form an integrated structure;

[0042] The connection relationship between the first wheel body and the second wheel body of the impeller is redefined so that the first wheel body and the second wheel body are positioned by protrusions and small holes and then heat-fused into one.

[0043] In one embodiment, the blade is a vortex blade disposed on the second wheel body and extending from the rotation center of the impeller to the edge of the impeller;

[0044] As the blades extend toward the edge of the impeller, the width of the blades gradually decreases;

[0045] In one embodiment, the number of blades is a prime number;

[0046] The outlet angle formed by the extension line of the blade and the tangent line of the blade rotation is between 30° and 50°. The use of curved blades and specific outlet angles improves the performance of the overall impeller structure and its function in drainage of the watershed.

[0047] Moreover, the

[0048] The inner wall of the pump body adopts an involute design. A water retaining rib is formed by extending the involute near the outlet of the inner wall of the pump cavity.

[0049] In one embodiment, the ratio of the area of ​​the liquid outlet blocked by the water retaining rib to the area of ​​the liquid outlet is less than or equal to 0.67;

[0050] In one embodiment, the involute angle is between 3° and 7°;

[0051] In one embodiment, the ratio of the impeller diameter to the pump body diameter is between 0.75 and 0.85, and the interior of the pump body adopts an involute design, which improves the rationality of the liquid flow field inside the pump body and also improves the performance and life of the pump body structure.

[0052] Furthermore, the

[0053] A liquid outlet pipe is provided at the liquid outlet;

[0054] The liquid outlet pipe is provided with a first mounting seat for fixing the second pressure switch;

[0055] In one embodiment, the second pressure switch senses the liquid level in the pump chamber to form a sensing plane, and a pressure switch is provided at the liquid outlet pipe of the pump body to detect the liquid flowing through the liquid outlet, thereby further ensuring the heating function of the pump body. At the same time, the pressure switch is directly connected to the liquid outlet pipe to avoid the influence of hot liquid on the pressure switch.

[0056] Furthermore, the

[0057] The heating component extends into the pump cavity from the radial direction of the pump body. This avoids the formation of a plane angle between the heating component and the impeller, which causes noise when the liquid circulates in the pump cavity. At the same time, under the action of the angle, trickle flow is generated, causing impact on the pump cavity wall, which affects the service life of the pump body after long-term use.

[0058] In addition, the heating components include

[0059] A heating tube and a fuse and a heating wire arranged inside the heating tube;

[0060] The first heating unit, the second heating unit and the third heating unit are sequentially arranged and matched with the passing bolts and nuts to realize the connection between the heating pipe and the pump body, redefining the connection mode between the heating component and the pump body, so that the heating component is subjected to clamping force both inside and outside the pump body, improving the sealing performance of the device, and also improving the disassembly, repair, maintenance and maintenance of the heating component and the replacement of the pressure switch, thereby improving the user experience;

[0061] In one embodiment, the heating tube includes an arc segment, a first straight segment, and a second straight segment;

[0062] The first straight line segment is connected to one end of the arc segment, and the second straight line segment is connected to the other end of the arc segment;

[0063] The fuse is arranged in at least one of the first straight segment and the second straight segment and away from the arc segment;

[0064] The heating pipe extends from the side of the pump body into the second chamber in the pump cavity;

[0065] The arc portion surrounds the impeller and is spaced apart from the impeller;

[0066] In one embodiment, the arc segment, the first straight segment and the second straight segment of the heating tube are in the same plane, forming a heating plane that heats the liquid flowing through. On the heating tube, the thermal stress coupling is more uniform and the structure of the heating tube is more compact, avoiding the situation where the life of the heating component is shortened or safety accidents occur due to local stress concentration.

[0067] Furthermore, the

[0068] The first heating unit forms a cover or a housing or a gland, which is extended outward from the pump cavity to achieve the sealing of the second heating unit in the pump cavity;

[0069] The first heating unit prevents the second heating unit from being heated and deformed in the bolt installation direction;

[0070] In one embodiment, the second heating unit cooperates with the mounting groove on the pump body and the third heating unit, and extends from the outside of the pump body to the inside of the pump cavity, and under the action of the first heating unit, the pump cavity is sealed;

[0071] In one embodiment, the third heating unit cooperates with the mounting groove on the pump body, and from the outside of the pump body to the inside, the second heating unit is pressed against the mounting groove of the pump body, thereby achieving sealing of the second heating unit;

[0072] In one embodiment, the first heating unit, the second heating unit and the third heating unit cooperate with the mounting grooves provided on the pump body to form a mounting plane.

[0073] Furthermore, the

[0074] The sensing plane for sensing the liquid level in the pump cavity by the second pressure switch is not lower than the heating plane for heating the liquid in the pump cavity by the heating component, and / or the installation plane formed by the heating component and the installation groove, which effectively avoids the occurrence of dry burning of the heating component. The pressure switch in the same sensing plane is more sensitive to the liquid in the pump cavity, which improves the working efficiency of the pump body and avoids energy waste.

[0075] In one embodiment, the heating plane and the mounting plane are coplanar.

[0076] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0077] 1. The present invention sets the installation plane of the heating component and the heating plane in the same plane, thereby ensuring that during the heating process, the thermal stress coupling on the heating tube is more uniform, the structure of the heating tube is more compact, and the shortening of the heating component life or the occurrence of safety accidents caused by local stress concentration is avoided;

[0078] 2. Furthermore, the sensing plane of the pressure switch and the heating plane, and / or the mounting plane are arranged in the same plane, which effectively avoids the occurrence of dry burning of the heating component. The pressure switch in the same sensing plane is more sensitive to the liquid in the pump cavity, which improves the working efficiency of the pump body and avoids energy waste;

[0079] 3. Furthermore, the positional relationship between the impeller and the heating component is set to improve the flow situation in the pump cavity, making the flow more uniform and the heating efficiency higher. The heating component is set at the lower part of the impeller, which ensures the heating efficiency while reducing the additional space occupied by the heating component in the pump body, and also avoids the impact of the liquid entering the pump cavity on the heating component, thereby improving the safety performance of the heating component;

[0080] 4. Furthermore, the structure of the heating component is improved, and the pressure switch is combined with it, so that the heating plane, the mounting plane and the sensing plane are on the same side. At the same time, through the improvement of the heating component structure, the connection method between the heating component and the pump body is redefined, so that the heating component is clamped inside and outside the pump body, which improves the sealing performance of the device, and also improves the disassembly, repair, maintenance and maintenance of the heating component and the replacement of the pressure switch, thereby improving the user experience;

[0081] 5. Furthermore, by redefining the impeller structure, the liquid flow area in the pump cavity is replanned, the flow of liquid in the pump cavity is more uniform, and the impact on the cavity wall caused by too many corners is avoided. At the same time, by setting a second water path from the circulation hole at the bottom of the impeller to the inside of the impeller, the heating function of the heating component on the liquid is ensured, and the flow area in the pump cavity is more reasonable, realizing the integration of suction and discharge, and reducing the space occupied by the impeller and the heating component in the pump cavity, so that the volume of the pump body is reduced;

[0082] 6. Furthermore, by providing a drainage arm structure between the impeller and the liquid inlet of the pump body, the liquid can flow directly into the impeller, avoiding the need to provide an overly high, overly large or overly complex drainage structure on the impeller. At the same time, the shape between the impeller and the pump body is structurally suitable, which greatly reduces the gap between the impeller and the pump body, thereby further reducing the volume of the pump body.

[0083] 7. Furthermore, the connection relationship between the first wheel body and the second wheel body of the impeller is redefined, so that the first wheel body and the second wheel body are positioned by protrusions and small holes and then melted into one body by heat, and arc-shaped blades and specific outlet angles are used to improve the performance of the overall structure of the impeller and the function of drainage in the watershed;

[0084] 8. Furthermore, the involute design is adopted inside the pump body, which improves the rationality of the liquid flow inside the pump body and also improves the performance and life of the pump body structure;

[0085] 9. Furthermore, a pressure switch is provided at the outlet pipe of the pump body to detect the liquid flowing through the outlet, thereby further ensuring the heating function of the pump body. At the same time, the pressure switch is directly connected to the outlet pipe to avoid the influence of the hot liquid on the pressure switch;

[0086] 10. Furthermore, adding a water retaining rib formed by the extension line of the involute at the outlet pipe of the inner wall of the pump chamber can effectively increase the force of the impeller on the liquid, increase the action time, and increase the water pressure;

[0087] 11. Furthermore, the heating component is extended into the pump cavity from the radial direction of the pump body, so as to avoid the formation of a plane angle between the heating component and the impeller, so that the liquid generates noise when circulating in the pump cavity. At the same time, under the action of the angle, trickling is generated, causing impact on the pump cavity wall, and long-term use affects the service life of the pump body.

[0088] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0090] In the attached picture:

[0091] Figure 1 It is an exploded schematic diagram of the pump body structure of the washing device of the present invention, used to show the matching relationship of various components in the pump body;

[0092] Figure 2 It is a first schematic diagram of a cross-sectional view of the pump body structure of the washing device of the present invention, which is used to show the arrangement of the heating component, the impeller, etc. inside the pump body;

[0093] Figure 3 is a second schematic diagram of a cross-sectional view of the pump body structure of the washing device of the present invention, Figure 2 The pump body is rotated 90° to show the internal chamber of the pump structure from another angle.

[0094] Figure 4 This is the first schematic diagram of the explosion of the heating component of the pump body structure of the present invention, and the explosion of various parts of the heating component is displayed along the installation direction of the heating component;

[0095] Figure 5 The second schematic diagram of the explosion of the heating component of the pump structure of the present invention is shown in FIG. Figure 4 Another angle of view, showing the various parts of the heating assembly in an exploded view;

[0096] Figure 6 It is a cross-sectional schematic diagram of the heating component of the pump body structure of the present invention, and the heating component is cross-sectionally displayed based on the main view;

[0097] Figure 7 It is a schematic diagram of an exploded view of an impeller of a pump body structure of the present invention;

[0098] Figure 8 It is a schematic diagram of the impeller flow area of ​​the pump body structure of the present invention, showing the flow area formed by the flow of liquid in the impeller;

[0099] Fig. 9 is a schematic top view of the second wheel body in the impeller of the present invention, in which the outlet angle is shown;

[0100] Fig.10 It is a schematic diagram of the involute of the pump body structure of the present invention, mainly showing the involute angle in the involute design in the pump cavity;

[0101] Fig.11 It is the first schematic diagram of the pump body structure of the present invention, mainly showing the technical solution of setting a second pressure switch at the liquid outlet;

[0102] Fig.12 It is the second schematic diagram of the pump body structure of the present invention, which mainly shows the technical solution of setting a temperature switch on the outside of the pump body;

[0103] Fig.13 This is the third schematic diagram of the pump body structure of the present invention, mainly showing the water retaining ribs arranged on the inner wall of the pump chamber near the liquid outlet.

[0104] In the figure: 1, pump body; 1.1, first pump shell; 1.2, second pump shell; 1.3, involute angle; 2, pump cavity; 2.1, first chamber; 2.2, second chamber; 3, liquid inlet; 4, liquid outlet; 5, impeller; 5.1, circulation hole; 5.2, first wheel body; 5.3, second wheel body; 5.4, water inlet; 5.5, liquid outlet cavity; 5.6, first water path; 5.7, second water path; 5.8, blade; 5.9, protrusion; 5.10, small hole; 5.11, outlet angle; 6, motor; 7, heating component; 7.1, heating tube; 7.1.1, arc segment; 7.1.2, first straight segment; 7.1.3, second straight segment; 7.2, bolt; 7.3, nut; 7.4, first Heating unit; 7.5, second heating unit; 7.6, third heating unit; 7.7, first through hole group; 7.8, sensing hole; 7.9, second through hole group; 7.10, fixing seat; 7.11, third through hole group; 7.12, first clamping claw; 7.13, first slot; 7.14, pressing plate groove; 7.15, fixing hole; 8, pressure sensing part; 8.1, first pressure switch; 8.2, second pressure switch; 9, drainage wall; 10, liquid outlet pipe; 11, first mounting seat; 12, temperature switch; 13, second mounting seat; 14, positioning pin; 15, positioning seat; 16, sealing ring; 17, second clamping claw; 18, second slot; 19, positioning rib; 20, mounting groove; 21, water retaining rib.

[0105] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0106] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0107] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0108] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0109] With the improvement of living standards, consumers have higher and higher requirements for the quality of life, and thus higher and higher requirements for product quality, performance, humanization of use, intelligent operation and other aspects. As an excellent product, dishwashers have gradually entered people's lives. At present, dishwasher technology generally uses a heating pump that integrates washing and heating functions. The pump body 1 with heating function usually includes upper and lower pump shells, an impeller 5 installed in the pump shell, a motor 6 for driving the impeller 5 to rotate, and a heating body for heating the fluid. Several existing heating pumps, in a type of household appliance application scenario used for liquid drive and continuous circulation heating, require a compact liquid drive and heating component. The heating body is installed inside the pump shell or is a separate part of the pump shell (such as the upper pump shell or the lower pump shell). The heating body installed inside the pump shell, such as the annular heating tube 7.1, needs to be wound between the outer side of the impeller 5 and the pump shell, which increases the pump shell area and reduces the pump efficiency. At the same time, the safety protection device measures of the heating tube 7.1 itself are missing, and it cannot pass the test under abnormal conditions, such as the dry burning experiment of the heating tube 7.1. In addition, for a heating pump in which the heating element is a part of the pump casing, since the pump casing requires good sealing and heat resistance, the sealing structure of the pump casing and the heating tube 7.1 is generally more complicated, and the comprehensive cost of parts manufacturing and assembly is higher.

[0110] Therefore, in response to the above-mentioned technical problems existing in use, the present invention provides a pump body 1 structure of a washing device, which can reduce the volume of the pump body 1 and increase the washing accommodation space of the washing device while ensuring the function of the pump body 1. At the same time, by changing the structure of the impeller 5, the flow condition in the pump chamber 2 is improved, so that the flow rate is more uniform, the impact on the chamber wall is reduced, and the service life of the pump body 1 is extended. Moreover, by changing the structure of the heating component 7, the thermal field in the pump chamber 2 becomes more uniform, thereby avoiding the problems caused by thermal coupling, as described below.

[0111] Figure 1 The exploded schematic diagram of the pump body 1 of the washing device of the present invention is used to show the matching relationship of various components in the pump body 1. Figure 1It can be seen that the pump body 1 structure of the washing device is divided into two parts: the pump body 1 and the heating component 7, wherein the heating plane and the installation plane of the heating component 7 are in the same plane, ensuring that during the heating process, the thermal stress coupling on the heating tube 7.1 is more uniform, the structure of the heating tube 7.1 is more compact, and the shortening of the life of the heating component 7 or the occurrence of safety accidents caused by local stress concentration is avoided. In addition, the pump body 1 is provided with a first pump casing 1.1, a second pump casing 1.2, a positioning pin 14, a positioning seat 15, a sealing ring 16, a second pump casing 1.2 and a motor 6 in the rotation direction of the impeller 5 in the installation order. The first pump casing 1.1 and the second pump casing 1.2 in the pump body 1 are connected by a second claw 17 and a second groove 18. Figure 1 It can also be seen that the first pressure switch 8.1 is connected to the heating component 7. The purpose of this arrangement is to set the sensing plane of the pressure switch and the heating plane, and / or the mounting plane in the same plane, which effectively avoids the occurrence of dry burning of the heating component 7. The pressure switch in the same sensing plane is more sensitive to the liquid in the pump chamber 2, thereby improving the working efficiency of the pump body 1 and avoiding energy waste.

[0112] Figure 2 The first schematic diagram of the cross-sectional view of the pump body 1 of the washing device of the present invention is used to show the arrangement of the heating component 7, the impeller 5, etc. inside the pump body 1. Figure 2 A cross-sectional schematic diagram of the pump body 1 structure including the heating component 7 can be seen in the figure. It can be clearly seen that the heating component 7 is arranged at the lower part of the impeller 5. Specifically, the lower part of the impeller 5 refers to the position when the liquid inlet 3 of the pump body 1 structure faces upward and the motor 6 faces downward. This position is also the position when the pump body 1 structure is installed on the washing device. It can be seen that the projection of the liquid outlet 4 in the pump chamber 2 at least covers the impeller 5 and part of the heating component 7. By covering the impeller 5 and the heating component 7, the deposited liquid in the second chamber 2.2 is effectively circulated, and excessive deposition of liquid in the second chamber 2.2 is avoided to cause poor circulation of the flow basin, thereby affecting the use of the pump body 1. In addition, through the positional relationship between the impeller 5 and the heating component 7, the flow basin in the pump chamber 2 is improved, so that the flow rate is more uniform and the heating efficiency is higher. The heating component 7 is arranged at the lower part of the impeller 5. While ensuring the heating efficiency, it reduces the additional occupation of the pump body 1 space by the heating component 7, and also avoids the heating component 7 from being impacted by the liquid entering the pump chamber 2, thereby improving the safety performance of the heating component 7.

[0113] Figure 3 This is a second schematic diagram of the cross-sectional view of the pump body 1 of the washing device of the present invention. Figure 2 The internal chamber of the pump body 1 is rotated 90° to show it from another angle. Specifically, Figure 3 for Figure 2The left view is mainly for the purpose of clearly showing the pump chamber 2 in the pump body 1 structure. Figure 3 It can be seen that the impeller 5 divides the pump chamber 2 into a first chamber 2.1 close to the liquid inlet 3 and a second chamber 2.2 away from the liquid inlet 3. The heating component 7 is arranged in the second chamber 2.2. The positional relationship between the impeller 5 and the heating component 7 is set to improve the flow condition in the pump chamber 2, so that the flow rate is more uniform and the heating efficiency is higher. The heating component 7 is arranged at the lower part of the impeller 5. While ensuring the heating efficiency, it reduces the additional space occupied by the heating component 7 on the pump body 1, and also avoids the heating component 7 from being impacted by the liquid entering the pump chamber 2, thereby improving the safety performance of the heating component 7.

[0114] Figure 4 This is the first exploded schematic diagram of the heating assembly 7 of the pump body 1 structure of the present invention. Along the installation direction of the heating assembly 7, the various parts of the heating assembly 7 are exploded and displayed, and the internal structure of the heating assembly 7 is decomposed one by one. It can be seen that the heating plane formed by the heating tube 7.1 of the heating assembly 7 and the installation plane formed by the installation component of the heating assembly 7 are in the same plane, which ensures that during the heating process, the thermal stress coupling on the heating tube 7.1 is more uniform, the structure of the heating tube 7.1 is more compact, and the situation of shortening the life of the heating assembly 7 or safety accidents caused by local stress concentration is avoided;

[0115] Figure 5 The second schematic diagram of the explosion of the heating assembly 7 of the pump body 1 structure of the present invention is shown in FIG. Figure 4 From another perspective, the various parts of the heating assembly 7 are exploded to show the other side structures of the first heating unit 7.4, the second heating unit 7.5 and the third heating unit 7.6. Figure 5 It can be seen that the third heating unit 7.6 is provided with a sink groove, the second heating unit 7.5 is embedded in the sink groove of the third heating unit 7.6, the first heating unit 7.4 cooperates with the second heating unit 7.5 and the third heating unit 7.6 outside the pump chamber 2 from the inside of the pump chamber 2, and the second heating unit 7.5 is clamped by the action of the bolt 7.2 and the nut 7.3, thereby achieving the sealing of the heating assembly 7 and the pump body 1;

[0116] Figure 6 The schematic cross-sectional view of the heating component 7 of the pump body 1 structure of the present invention is shown in cross-section on the basis of the main view. Figure 5 The technical solution described is demonstrated;

[0117] Figure 7It is a schematic diagram of an exploded view of the impeller 5 of the pump body 1 structure of the present invention, wherein the first wheel body 5.2 and the second wheel body 5.3 of the impeller 5 are separated, so that those skilled in the art can have a further understanding of the impeller 5 described in the present application, and the connection relationship between the first wheel body 5.2 and the second wheel body 5.3 of the impeller 5 is redefined, so that the first wheel body 5.2 and the second wheel body 5.3 are positioned by the protrusion 5.9 and the small hole 5.10, and then are thermally melted into one, and arc-shaped blades 5.8 and a specific outlet angle 5.11 are used, so as to improve the performance of the overall structure of the impeller 5 and the function of drainage in the watershed;

[0118] Figure 8 The schematic diagram of the impeller 5 flow area of ​​the pump body 1 structure of the present invention shows the flow area formed by the flow of liquid in the impeller 5. Figure 8 It can be seen that the liquid flows into the impeller 5 through the liquid inlet 3, forms a drainage with the blades 5.8, flows through the liquid outlet cavity 5.5, and flows out of the first water path 5.6 from the liquid outlet 4; flows through the liquid outlet cavity 5.5, enters the second chamber 2.2, and flows back to the liquid outlet cavity 5.5 from the circulation hole 5.1 set on the second wheel body 5.3, and finally converges to the second water path 5.7 that flows out of the first water path 5.6 from the liquid outlet 4; at the same time, by setting the second water path 5.7 that flows back from the circulation hole 5.1 at the bottom of the impeller 5 to the inside of the impeller 5 in the impeller 5 structure, the heating component 7 is guaranteed to heat the liquid, and the flow field in the pump cavity 2 is more reasonable, realizing the integration of suction and discharge, and at the same time reducing the space occupied by the impeller 5 and the heating component 7 in the pump cavity 2, so that the volume of the pump body 1 is reduced;

[0119] Fig. 9 1 is a schematic top view of the second wheel body 5.3 of the impeller 5 of the present invention. In the top view, the outlet angle 5.11 is shown, so that those skilled in the art can understand the outlet angle 5.11 of the blade 5.8.

[0120] Fig.10 This is a schematic diagram of the involute of the pump body 1 structure of the present invention, which mainly shows the involute angle 1.3 in the involute design in the pump chamber 2, so that those skilled in the art can have a further understanding of the use of the involute on the pump body 1. It should be noted that: Fig.10 It is just a schematic diagram. A water retaining rib 21 is provided on the inner wall of the pump chamber 2 near the liquid outlet 4. Fig.10 It is not expressed in the text, but it does not mean that the specific structure inside the pump chamber 2 is the same as Fig.10 As shown;

[0121] Fig.11 This is the first schematic diagram of the structure of the pump body 1 of the present invention, which mainly shows the technical solution of setting a second pressure switch at the liquid outlet 4. It should be noted that: Fig.11The first pressure switch 8.1 and the second pressure switch 8.2 are arranged on the same side. Fig.11 However, it does not mean that when the first pressure switch 8.1 or the second pressure switch 8.2 is set, the second pressure switch 8.2 or the first pressure switch 8.1 must be required at the same time. When one of the pressure switches is removed, this solution is still feasible, and it is only necessary to block the installation port with a plug or other measures to prevent liquid leakage;

[0122] Fig.12 This is the second schematic diagram of the pump body 1 structure of the present invention, which mainly shows the technical solution of setting a temperature switch 12 on the outside of the pump body 1. It should be noted that: Fig.12 The technical solution of the temperature switch 12 may also include the technical solution of providing a first pressure switch 8.1 and / or a second pressure switch 8.2. When the temperature switch 12 is removed, the installation port may be blocked by a plug or other measures to drain liquid;

[0123] Fig.13 This is the third schematic diagram of the structure of the pump body 1 of the present invention, which mainly shows the water retaining rib 21 arranged on the inner wall of the pump chamber 2 near the liquid outlet 4. Inside the pump chamber 2, near the liquid outlet 4, that is, the position of the liquid outlet pipe 10, there is an additional water retaining rib 21 inside the pump chamber 2. The water retaining rib 21 formed by adding the extension line of the involute at the liquid outlet pipe 10 on the inner wall of the pump chamber 2 can effectively increase the force of the impeller 5 on the liquid, increase the action time, and increase the water pressure.

[0124] When the above-mentioned technical solution is applied to a specific embodiment, it is described as follows.

[0125] Embodiment 1

[0126] like Figures 1 to 13 As shown, a pump for a washing device described in this embodiment includes a pump body 1; a pump chamber 2 for accommodating liquid is provided in the pump body 1; a liquid inlet 3 and a liquid outlet 4 connected to the pump chamber 2 are provided on the pump body 1; an impeller 5 connected to the motor 6 through a rotating shaft is provided in the pump chamber 2; and the pump also includes a heating component 7 extending from the outside of the pump body 1 to the pump chamber 2 to heat the liquid in the pump chamber 2; a first pressure switch 8.1 is provided on the pump body 1 and connected to the heating component 7; the impeller 5 divides the pump chamber 2 into a first chamber 2.1 close to the liquid inlet 3 and a second chamber 2.2 away from the liquid inlet 3; the heating component 7 is provided in the second chamber 2.2, and when the liquid flows into the pump chamber 2 through the liquid inlet 3, it flows through the impeller 5 and the heating component 7 in sequence and then flows out from the liquid outlet 4.

[0127] Embodiment 2

[0128] like Figures 1 to 13As shown, this embodiment is a further limitation of the above-mentioned embodiment 1. In the pump of a washing device described in this embodiment, the projection of the liquid outlet 4 in the pump chamber 2 at least covers the impeller 5 and a part of the heating component 7. By covering the impeller 5 and the heating component 7, the deposited liquid in the second chamber 2.2 is effectively circulated, avoiding excessive deposition of liquid in the second chamber 2.2 to cause poor circulation in the flow basin, thereby affecting the use of the pump body 1.

[0129] Embodiment 3

[0130] like Figure 4 and Figure 5 As shown, this embodiment is a further limitation of the above-mentioned embodiment 1 or embodiment 2. The pump of a washing device described in this embodiment, wherein the heating component 7 includes a heating tube 7.1 and a fuse and a heating wire arranged inside the heating tube 7.1; the first heating unit 7.4, the second heating unit 7.5 and the third heating unit 7.6 are arranged in sequence and cooperated with the nut 7.3 through the passing bolts 7.2 to realize the connection between the heating tube 7.1 and the pump body 1, and the connection method between the heating component 7 and the pump body 1 is redefined, so that the heating component 7 is subjected to clamping force both inside and outside the pump body 1, thereby improving the sealing performance of the device, and also improving the disassembly, repair, maintenance and maintenance of the heating component 7 and the replacement of the pressure switch, thereby improving the user experience.

[0131] Furthermore, the heating tube 7.1 comprises an arc segment 7.1.1, a first straight segment 7.1.2 and a second straight segment 7.1.3; the first straight segment 7.1.2 is connected to one end of the arc segment 7.1.1, and the second straight segment 7.1.3 is connected to the other end of the arc segment; the fuse is arranged in at least one of the first straight segment 7.1.2 and the second straight segment 7.1.3 and away from the arc segment 7.1.1; the heating tube 7.1 extends from the side of the pump body 1 into the second chamber 2.2 in the pump cavity 2; the arc portion surrounds the impeller 5 and is spaced apart from the impeller 5.

[0132] Embodiment 4

[0133] like Figure 4 and Figure 5 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 3 above. In the pump of a washing device described in this embodiment, the arc segment 7.1.1, the first straight segment 7.1.2 and the second straight segment 7.1.3 of the heating tube 7.1 are located in the same plane to form a heating plane for heating the liquid flowing therethrough. On the heating tube 7.1, the thermal stress coupling is more uniform, and the structure of the heating tube 7.1 is more compact, thereby avoiding the situation in which the life of the heating component 7 is shortened or a safety accident occurs due to local stress concentration.

[0134] Embodiment 5

[0135] like Figure 4 and Figure 5 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 4 above. In the pump of a washing device described in this embodiment, the first heating unit 7.4 is arranged in the pump chamber 2; the first straight line segment 7.1.2, the second straight line segment 7.1.3 and the bolt 7.2 pass through the first through hole group 7.7 provided on the first heating unit 7.4 from the inside of the pump chamber 2 to the outside. The first through hole group 7.7 is a through hole for positioning the first straight line segment 7.1.2, the second straight line segment 7.1.3 and the bolt 7.2 of the heating tube 7.1, and can be of the same size or of different sizes. In order to facilitate the distinction from other heating units, it is referred to as the first through hole group 7.7 in the first heating unit 7.4. In addition, the first heating unit 7.4 is also provided with a sensing hole 7.8 for sensing the liquid level in the pump chamber 2 for the first pressure switch 8.1. The liquid in the pump chamber 2 passes through the sensing hole 7.8 to transmit the height of the liquid level to the first pressure switch 8.1, from Figure 4 and Figure 5 It can be seen from the figure that the first through hole group 7.7 and the sensing hole 7.8 provided on the first heating unit 7.4 are in the same plane.

[0136] Embodiment 6

[0137] like Figure 4 and Figure 5 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 5 above. In the pump of a washing device described in this embodiment, the first heating unit 7.4 forms a cover or a shell or a pressure cover to achieve the sealing of the second heating unit 7.5 in the pump chamber 2. The first heating unit 7.4 prevents the second heating unit 7.5 from being heated and deformed in the installation direction of the bolt 7.2. Furthermore, the hardness of the first heating unit 7.4 is greater than that of the second heating unit 7.5.

[0138] Embodiment 7

[0139] like Figure 4 and Figure 5As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 6 above. In a pump for a washing device described in this embodiment, the second heating unit 7.5 cooperates with the mounting groove 20 and the third heating unit 7.6 on the pump body 1, and extends from the outside of the pump body 1 to the inside of the pump chamber 2. Under the action of the first heating unit 7.4, the pump chamber 2 is sealed. After the first straight line segment 7.1.2, the second straight line segment 7.1.3 and the bolt 7.2 pass through the first heating unit 7.4, they pass through the second through hole group 7.9 provided on the second heating unit 7.5 and corresponding to the first through hole group 7.7. The second heating unit 7.5 is also provided with a fixing seat 7.10 that cooperates with the first pressure switch 8.1. The fixing seat 7.10 corresponds to the sensing hole 7.8. The first pressure switch 8.1 is fixed to the heating assembly 7 through the fixing seat 7.10. Figure 4 and Figure 5 As shown, the fixing seat 7.10 is a hollow structure, and the first pressure switch 8.1 passes through the hollow fixing seat 7.10 through the protrusion 5.9 provided at the front end to achieve fixation.

[0140] Embodiment 8

[0141] like Figure 4 and Figure 5 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 7 above. In this embodiment, a pump for a washing device is described, wherein the fixing seat 7.10 is a columnar structure with elasticity or internal threads or buckles.

[0142] Embodiment 9

[0143] like Figure 4 and Figure 5 As shown, this embodiment is a further limitation of any of the embodiments described in embodiments 1 to 8 above. In a pump for a washing device described in this embodiment, the third heating unit 7.6 cooperates with the mounting groove 20 on the pump body 1, and presses the second heating unit 7.5 and the mounting groove 20 of the pump body 1 from the outside of the pump body 1 to the inside, thereby achieving the sealing of the second heating unit 7.5. The first straight section 7.1.2, the second straight section 7.1.3 and the bolt 7.2 pass through the third through hole group 7.11 provided on the third heating unit 7.6 and corresponding to the first through hole group 7.7 and the second through hole group 7.9. The third heating unit 7.6 is also provided with a fixing hole 7.15 that cooperates with the fixing seat 7.10 of the second heating unit 7.5. The fixing hole 7.15 is mainly provided for the first pressure switch 8.1 to pass through the third heating unit 7.6.

[0144] Embodiment 10

[0145] like Figure 4 and Figure 5As shown, this embodiment is a further limitation of any of the embodiments described in embodiments 1 to 9 above. In this embodiment, a pump for a washing device is described, wherein the first heating unit 7.4, the second heating unit 7.5 and the third heating unit 7.6 cooperate with the mounting groove 20 provided on the pump body 1 to form a mounting plane.

[0146] Furthermore, after the first pressure switch 8.1 is connected to the heating assembly 7, a sensing plane is formed from the inside of the pump chamber 2, passing through the sensing hole 7.8, the fixing seat 7.10 and the fixing hole 7.15 in sequence, to sense the liquid level in the pump chamber 2.

[0147] Embodiment 11

[0148] like Figure 4 and Figure 5 As shown, this embodiment is a further limitation of any of the embodiments described in embodiments 1 to 10 above. In a pump for a washing device described in this embodiment, the sensing plane of the first pressure switch 8.1 for sensing the liquid level in the pump chamber 2 is not lower than the heating plane of the heating component 7 for heating the liquid in the pump chamber 2, and\or the mounting plane formed by the heating component 7 and the mounting groove 20. The sensing plane of the pressure switch and the heating plane, and\or the mounting plane are arranged in the same plane, which effectively avoids the occurrence of dry burning of the heating component 7. The pressure switch in the same sensing plane is more sensitive to the liquid in the pump chamber 2, thereby improving the working efficiency of the pump body 1 and avoiding energy waste.

[0149] Embodiment 12

[0150] like Figure 4 and Figure 5 As shown, this embodiment is a further limitation of any one of the embodiments one to eleven described above. In this embodiment, a pump for a washing device is described, wherein the sensing plane is coplanar with the heating plane and the mounting plane.

[0151] Embodiment 13

[0152] like Figures 1 to 13As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 12 above. A pump for a washing device described in this embodiment comprises a pump body 1; the pump body 1 forms a pump chamber 2 for containing liquid through a first pump shell 1.1 and a second pump shell 1.2 that are fastened together; the pump body 1 is provided with a liquid inlet 3 and a liquid outlet 4 that are connected to the pump chamber 2; an impeller 5 connected to a motor 6 is provided in the pump chamber 2; and the pump chamber 2 also comprises a heating component 7 that extends from the outside of the pump body 1 into the pump chamber 2 and heats the liquid in the pump chamber 2; the impeller 5 divides the pump chamber 2 into a first chamber 2.1 close to the liquid inlet 3 and a second chamber 2.2 away from the liquid inlet 3; the heating component 7 is arranged in the second chamber 2.2; and a circulation hole 5.1 is arranged on the main body of the impeller 5 so that the liquid in the second chamber 2.2 flows back to the impeller 5 and flows out from the liquid outlet 4.

[0153] Embodiment 14

[0154] like Figures 7 to 10 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 13 above. The pump of a washing device described in this embodiment, wherein the impeller 5 comprises a first wheel body 5.2 which is adapted to the shape of the first pump housing 1.1 and a second wheel body 5.3 which is equipped with blades 5.8; the first wheel body 5.2 is provided with a water inlet 5.4 corresponding to the liquid inlet 3; on the second wheel body 5.3, at least one circulation hole 5.1 is provided between two blades 5.8; a liquid outlet cavity 5.5 is formed between the first wheel body 5.2 and the second wheel body 5.3; by redefining the structure of the impeller 5, the liquid flow domain in the pump cavity 2 is replanned, the flow rate of the liquid in the pump cavity 2 is more uniform, and the impact on the cavity wall due to too many corners is avoided.

[0155] Embodiment 15

[0156] like Figures 7 to 10 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 14 above. In a pump for a washing device described in this embodiment, the liquid flows into the impeller 5 through the liquid inlet 3, forms a drainage with the blades 5.8, flows through the liquid outlet chamber 5.5, and flows out of the first water path 5.6 from the liquid outlet 4; flows through the liquid outlet chamber 5.5, enters the second chamber 2.2, and flows back to the liquid outlet chamber 5.5 from the circulation hole 5.1 provided on the second wheel body 5.3, and finally converges to the second water path 5.7 flowing out of the liquid outlet 4 from the first water path 5.6; at the same time, by providing a second water path 5.7 that flows back from the circulation hole 5.1 at the bottom of the impeller 5 to the inside of the impeller 5 in the impeller 5 structure, the heating component 7 is ensured to heat the liquid, while making the flow field in the pump chamber 2 more reasonable, realizing the integration of suction and discharge, and at the same time reducing the space occupied by the impeller 5 and the heating component 7 in the pump chamber 2, so that the volume of the pump body 1 is reduced.

[0157] Embodiment 16

[0158] like Figures 7 to 10 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 15 above. In the pump of a washing device described in this embodiment, the diameter of the circulation hole 5.1 is greater than or equal to 5% of the diameter of the impeller 5.

[0159] Embodiment 17

[0160] like Figures 7 to 10 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 16 above. In the pump of a washing device described in this embodiment, the liquid inlet 3 includes a drainage wall 9 extending into the pump chamber 2; the drainage arm extends into the water inlet 5.4 provided on the first wheel body 5.2, and introduces the liquid flowing through the liquid inlet 3 into the liquid outlet chamber 5.5 of the impeller 5. Specifically, the gap between the first wheel body 5.2 and the first pump housing 1.1 forms the first chamber 2.1, and because the drainage arm extends into the water inlet 5.4 on the first wheel body 5.2, when the liquid flows into the impeller 5, there is no first chamber 2.1. After the liquid flows in, due to the rotation of the impeller 5, a certain amount of liquid will enter the first chamber 2.1. Therefore, the first chamber 2.1 has a very small effect on the working position of the pump body 1. Therefore, the present application minimizes the size of the first chamber 2.1 as much as possible, and sets a drainage arm structure between the impeller 5 and the liquid inlet 3 of the pump body 1, so that the liquid can directly flow into the impeller 5, avoiding the setting of a drainage structure that is too high, too large or too complicated on the impeller 5. At the same time, the shape between the impeller 5 and the pump body 1 is structurally suitable, which greatly reduces the gap between the impeller 5 and the pump body 1, so that the volume of the pump body 1 is further reduced.

[0161] Embodiment 18

[0162] like Figures 7 to 10 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 17 above. In a pump for a washing device described in this embodiment, at least one protrusion 5.9 is arranged at intervals on one side of the blade 5.8 facing the first wheel body 5.2; corresponding small holes 5.10 are arranged on the first wheel body 5.2 corresponding to the protrusions 5.9 arranged on the blade 5.8; when the first wheel body 5.2 and the second wheel body 5.3 are buckled, the protrusions 5.9 pass through the small holes 5.10, and after melting treatment, the first wheel body 5.2 and the second wheel body 5.3 form an integral structure; the connection relationship between the first wheel body 5.2 and the second wheel body 5.3 of the impeller 5 is redefined, so that the first wheel body 5.2 and the second wheel body 5.3 are positioned by the protrusions 5.9 and the small holes 5.10 and then are melted into one.

[0163] Embodiment 19

[0164] like Figures 7 to 10As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 18 above. In the pump of a washing device described in this embodiment, the blades 5.8 are vortex blades arranged on the second wheel body 5.3 and extending from the rotation center of the impeller 5 to the edge of the impeller 5; as the blades 5.8 are extended toward the edge of the impeller 5, the width of the blades 5.8 gradually decreases.

[0165] Embodiment 20

[0166] like Figures 7 to 10 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 19 above. In the pump of a washing device described in this embodiment, the number of blades 5.8 is a prime number; the outlet angle 5.11 formed by the extension line of the blade 5.8 and the tangent line of the rotation of the blade 5.8 is between 30° and 50°; the use of arc-shaped blades 5.8 and a specific outlet angle 5.11 improves the performance of the overall structure of the impeller 5 and the effect on the drainage of the watershed.

[0167] Embodiment 21

[0168] like Figures 7 to 10 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments one to twenty above. The pump of a washing device described in this embodiment has an inner wall of a pump body 1 that adopts an involute design. A water retaining rib 21 is formed by extending the involute at the inner wall of the pump chamber 2 near the liquid outlet 4. The water retaining rib 21 formed by the extension of the involute is added at the liquid outlet pipe 10 of the inner wall of the pump chamber 2, which can effectively increase the force of the impeller 5 on the liquid, increase the action time, and increase the water pressure.

[0169] Embodiment 22

[0170] like Figures 7 to 10 As shown, this embodiment is a further limitation of any one of the embodiments one to twenty-one described above. In the pump of a washing device described in this embodiment, the ratio of the area of ​​the liquid outlet 4 blocked by the water retaining rib 21 to the area of ​​the liquid outlet 4 is less than or equal to 0.67.

[0171] Embodiment 23

[0172] like Figures 7 to 10 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 22 above. In this embodiment, a pump for a washing device, the involute angle 1.3 is between 3° and 7°.

[0173] Embodiment 24

[0174] like Figures 7 to 10As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 23 above. In the pump for a washing device described in this embodiment, the ratio of the diameter of the impeller 5 to the diameter of the pump body 1 is between 0.75 and 0.85, and the interior of the pump body 1 adopts an involute design, which improves the rationality of the liquid flow field inside the pump body 1 and also improves the performance and life of the structure of the pump body 1.

[0175] Embodiment 25

[0176] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 24 above. A pump for a washing device described in this embodiment includes a pump body 1; a pump chamber 2 for accommodating liquid is provided in the pump body 1; a liquid inlet 3 and a liquid outlet 4 connected to the pump chamber 2 are provided on the pump body 1; an impeller 5 connected to a motor 6 is provided in the pump chamber 2; a heating component 7 extending from the outside of the pump body 1 to the pump chamber 2 for heating the liquid in the pump chamber 2; a pressure sensing part 8 provided on the pump body 1 for sensing the liquid level in the pump chamber 2; the impeller 5 divides the pump chamber 2 into a first chamber 2.1 close to the liquid inlet 3 and a second chamber 2.2 away from the liquid inlet 3; the heating component 7 is provided in the second chamber 2.2.

[0177] Embodiment 26

[0178] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 25 above. The pump of a washing device described in this embodiment, the pressure sensing part 8 includes a first pressure switch 8.1 arranged on the pump body 1 and connected to the heating component 7; a second pressure switch 8.2 arranged at the liquid outlet 4 of the pump body 1 and connected to the liquid outlet pipe 10; a pressure switch is arranged at the liquid outlet pipe 10 of the pump body 1 to detect the liquid flowing through the liquid outlet 4, thereby further ensuring the heating function of the pump body 1. At the same time, the pressure switch is directly connected to the liquid outlet pipe 10 to avoid the influence of hot liquid on the pressure switch. A first mounting seat 11 for fixing the second pressure switch 8.2 is arranged on the liquid outlet pipe 10; the pressure sensing part 8 forms a sensing plane for sensing the liquid level in the pump chamber 2.

[0179] Embodiment 27

[0180] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments one to twenty-six above. In the pump of a washing device described in this embodiment, the sensing plane of the pressure sensing part 8 for sensing the liquid level in the pump chamber 2 is not lower than the heating plane of the heating component 7 for heating the liquid in the pump chamber 2, and\or the installation plane formed by the heating component 7 and the installation groove 20, which effectively avoids the occurrence of dry burning of the heating component 7.

[0181] Embodiment 28

[0182] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 27 above. In a pump for a washing device described in this embodiment, the sensing plane of the first pressure switch 8.1 for sensing the liquid level in the pump chamber 2 is coplanar with the heating plane, and / or the mounting plane. The pressure switches in the same sensing plane are more sensitive to the liquid in the pump chamber 2, thereby improving the working efficiency of the pump body 1 and avoiding energy waste.

[0183] Embodiment 29

[0184] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 28 above. A pump for a washing device described in this embodiment comprises a pump body 1; a pump chamber 2 for accommodating liquid is provided in the pump body 1; a liquid inlet 3 and a liquid outlet 4 connected to the pump chamber 2 are provided on the pump body 1; an impeller 5 connected to a motor 6 is provided in the pump chamber 2; a heating component 7 extending from the outside of the pump body 1 into the pump chamber 2 for heating the liquid in the pump chamber 2; a second pressure switch 8.2 is provided at the liquid outlet 4 of the pump body 1 for sensing the liquid flowing through the liquid outlet 4; the impeller 5 divides the pump chamber 2 into a first chamber 2.1 close to the liquid inlet 3 and a second chamber 2.2 away from the liquid inlet 3; the heating component 7 is provided in the second chamber 2.2.

[0185] Embodiment 30

[0186] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 29 above. A pump for a washing device described in this embodiment is provided with a liquid outlet pipe 10 at the liquid outlet 4; a first mounting seat 11 for fixing the second pressure switch 8.2 is provided on the liquid outlet pipe 10; the first mounting seat 11 fixes the second pressure switch 8.2 by extrusion, threading or clamping, and a pressure switch is provided at the liquid outlet pipe 10 of the pump body 1 to detect the liquid flowing through the liquid outlet 4, thereby further ensuring the heating function of the pump body 1. At the same time, the pressure switch is directly connected to the liquid outlet pipe 10 to avoid the influence of the hot liquid on the pressure switch.

[0187] Embodiment 31

[0188] like Figures 1 to 13As shown, this embodiment is a further limitation of any one of the embodiments one to thirty described above. In the pump of a washing device described in this embodiment, the sensing plane of the second pressure switch 8.2 sensing the liquid level in the pump chamber 2 is not lower than the heating plane of the heating component 7 heating the liquid in the pump chamber 2, and\or the installation plane formed by the heating component 7 and the installation groove 20, which effectively avoids the dry burning of the heating component 7. The pressure switch in the same sensing plane is more sensitive to the liquid in the pump chamber 2, thereby improving the working efficiency of the pump body 1 and avoiding energy waste.

[0189] Embodiment 32

[0190] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments one to thirty-one described above, and the pump of a washing device described in this embodiment has a heating plane and a mounting plane that are coplanar.

[0191] Embodiment 33

[0192] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 32 above. A pump for a washing device described in this embodiment includes a pump body 1; a pump chamber 2 for accommodating liquid is provided in the pump body 1; a liquid inlet 3 and a liquid outlet 4 connected to the pump chamber 2 are provided on the pump body 1; an impeller 5 connected to a motor 6 is provided in the pump chamber 2; a heating component 7 extending from the outside of the pump body 1 to the pump chamber 2 for heating the liquid in the pump chamber 2; a temperature switch 12 is provided on the pump body 1 for monitoring the temperature of the liquid in the pump chamber 2; the impeller 5 divides the pump chamber 2 into a first chamber 2.1 close to the liquid inlet 3 and a second chamber 2.2 away from the liquid inlet 3; the heating component 7 is provided in the second chamber 2.2.

[0193] Embodiment 34

[0194] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments one to thirty-three above. A pump for a washing device described in this embodiment, wherein the pump body 1 is provided with a second mounting seat 13 for fixing a temperature switch 12, the temperature switch 12 extends from the second mounting seat 13 into the pump chamber 2, and the mounting plane of the second mounting seat 13 is parallel to the heating plane of the heating component 7.

[0195] Embodiment 35

[0196] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 34 above. In this embodiment, a pump for a washing device is described, wherein the mounting plane of the second mounting seat 13 is coplanar with the heating plane of the heating component 7.

[0197] Embodiment 36

[0198] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 35 above. In the pump of a washing device described in this embodiment, the second mounting seat 13 fixes the temperature switch 12 by extrusion, threading or clamping, and the temperature switch 12 is arranged on the outside of the pump body 1, so that the actual control of the heating in the pump cavity 2 becomes multidimensional and diversified, and the temperature monitoring further avoids the occurrence of dry burning problem.

[0199] Embodiment 37

[0200] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments one to thirty-six above. A heating device for a washing pump described in this embodiment includes a heating component 7 extending from the outside of a pump body 1 into a pump chamber 2 to heat the liquid in the pump chamber 2; the heating component 7 is connected to the pump body 1 via a mounting groove 20 provided on the pump body 1; the mounting plane formed by the connection between the heating component 7 and the pump body 1 via the mounting groove 20 is parallel to the heating plane formed by the heating component 7 heating the liquid in the pump chamber 2 of the pump body 1.

[0201] Embodiment 38

[0202] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments one to thirty-seven above. This embodiment describes a heating device for a washing pump, wherein the heating component 7 comprises a heating tube 7.1 and a fuse and a heating wire arranged inside the heating tube 7.1; a first heating unit 7.4, a second heating unit 7.5 and a third heating unit 7.6 are sequentially arranged and cooperated with the passing bolt 7.2 and the nut 7.3 to realize the connection between the heating tube 7.1 and the pump body 1, redefines the connection method between the heating component 7 and the pump body 1, so that the heating component 7 is subjected to clamping force both inside and outside the pump body 1, thereby improving the sealing performance of the device, and also improving the disassembly, repair, maintenance and care of the heating component 7 and the replacement of the pressure switch, thereby improving the user experience.

[0203] Embodiment 39

[0204] like Figures 1 to 13As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 38 above. This embodiment describes a heating device for a washing pump, wherein the heating tube 7.1 comprises an arc segment 7.1.1, a first straight segment 7.1.2 and a second straight segment 7.1.3; the first straight segment 7.1.2 is connected to one end of the arc segment 7.1.1, and the second straight segment 7.1.3 is connected to the other end of the arc segment; a fuse is arranged in at least one of the first straight segment 7.1.2 and the second straight segment 7.1.3 and away from the arc segment 7.1.1; the arc segment 7.1.1, the first straight segment 7.1.2 and the second straight segment 7.1.3 of the heating tube 7.1 are located in the same plane, forming a heating plane for heating the liquid flowing through; on the heating tube 7.1, the thermal stress coupling is more uniform, and the structure of the heating tube 7.1 is more compact, thereby avoiding the situation where the life of the heating component 7 is shortened or a safety accident occurs due to local stress concentration.

[0205] Embodiment 40

[0206] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments one to thirty-nine above. This embodiment describes a heating device for a washing pump, wherein the heating tube 7.1 extends from the outside of the pump body 1 into the pump chamber 2; the heating tube 7.1 is inside the pump body 1, located on the other side of the impeller 5 relative to the liquid inlet 3, and the arc portion surrounds the impeller 5 and is separated from the impeller 5. The positional relationship between the impeller 5 and the heating component 7 is set to improve the flow condition in the pump chamber 2, so that the flow rate is more uniform and the heating efficiency is higher. The heating component 7 is set at the lower part of the impeller 5, which ensures the heating efficiency while reducing the additional space occupied by the heating component 7 in the pump body 1, and also avoids the heating component 7 from being impacted by the liquid entering the pump chamber 2, thereby improving the safety performance of the heating component 7.

[0207] Embodiment 41

[0208] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 40 above. The heating device of a washing pump described in this embodiment, wherein the first heating unit 7.4 is arranged in the pump chamber 2; the first straight line segment 7.1.2, the second straight line segment 7.1.3 and the bolt 7.2 pass through the first through hole group 7.7 provided on the first heating unit 7.4 from the inside of the pump chamber 2 to the outside; the first heating unit 7.4 is also provided with a sensing hole 7.8, and the sensing hole 7.8 is used to pass liquid to sense the liquid level in the pump chamber 2. The first heating unit 7.4 forms a cover or a shell or a pressure cover to achieve the sealing of the second heating unit 7.5 in the pump chamber 2. The first heating unit 7.4 prevents the second heating unit 7.5 from being heated and deformed in the installation direction of the bolt 7.2. The hardness of the first heating unit 7.4 is greater than that of the second heating unit 7.5.

[0209] Embodiment 42

[0210] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 41 above. In this embodiment, a heating device for a washing pump is described, wherein the second heating unit 7.5 cooperates with the mounting groove 20 and the third heating unit 7.6 on the pump body 1, and extends from the outside of the pump body 1 to the inside of the pump chamber 2. Under the action of the first heating unit 7.4, the sealing of the pump chamber 2 is achieved. After the first straight line segment 7.1.2, the second straight line segment 7.1.3 and the bolt 7.2 pass through the first heating unit 7.4, they pass through the second through hole group 7.9 provided on the second heating unit 7.5 and corresponding to the first through hole group 7.7. The second heating unit 7.5 is also provided with a fixing seat 7.10 corresponding to the sensing hole 7.8. The fixing seat 7.10 is used to fix the first pressure switch 8.1 for sensing the liquid level in the pump chamber 2. The fixing seat 7.10 is a columnar structure with elasticity or an internal thread or buckle.

[0211] Embodiment 43

[0212] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 42 above. In this embodiment, a heating device for a washing pump is described, wherein the third heating unit 7.6 cooperates with the mounting groove 20 on the pump body 1, and presses the second heating unit 7.5 and the mounting groove 20 of the pump body 1 from the outside of the pump body 1 to the inside, thereby achieving the sealing of the second heating unit 7.5. The first straight line segment 7.1.2, the second straight line segment 7.1.3 and the bolt 7.2 pass through the third through hole group 7.11 provided on the third heating unit 7.6, which corresponds to the first through hole group 7.7 and the second through hole group 7.9. The third heating unit 7.6 is also provided with a fixing hole 7.15 that cooperates with the fixing seat 7.10 of the second heating unit 7.5.

[0213] Furthermore, the first heating unit 7.4, the second heating unit 7.5 and the third heating unit 7.6 cooperate with the mounting groove 20 provided on the pump body 1 to form a mounting plane.

[0214] Embodiment 44

[0215] like Figures 1 to 13As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 43 above. In the heating device of a washing pump described in this embodiment, the heating component 7 is positioned by docking the pressing groove 7.14 arranged on the third heating unit 7.6 with the positioning rib 19 arranged on the first pump housing 1.1; the heating component 7 is fixed by docking the first clamping claw 7.12 arranged on the first pump housing 1.1 with the first clamping groove 7.13 arranged on both sides of the third heating unit 7.6. Specifically, the heating component 7 The heating component 7 is aligned with the mounting groove 20 through the positioning rib 19 and the pressing plate groove 7.14, and then the heating component 7 is inserted into the mounting groove 20 of the pump body 1, and then clamped by the first claw 7.12 and the first clamping groove 7.13. Through the improvement of the structure of the heating component 7, the connection method of the heating component 7 and the pump body 1 is redefined, so that the heating component 7 is subjected to clamping force both inside and outside the pump body 1, thereby improving the sealing performance of the device, and also improving the disassembly, repair, maintenance, and replacement of the heating component 7 and the pressure switch, thereby improving the user experience.

[0216] Embodiment 45

[0217] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 44 above. In this embodiment, a heating device for a washing pump is described, wherein the installation plane formed by the heating component 7 connected to the pump body 1 through the installation groove 20 and the heating plane formed by the heating component 7 heating the liquid in the pump chamber 2 of the pump body 1 are coplanar, which effectively avoids the dry burning of the heating component 7. The pressure switch in the same sensing plane is more sensitive to the liquid in the pump chamber 2, thereby improving the working efficiency of the pump body 1 and avoiding energy waste.

[0218] Embodiment 46

[0219] like Figures 1 to 13 As shown, this embodiment is a further limitation of any one of the embodiments described in embodiments 1 to 45 above. This embodiment describes a heating device for a washing pump, in which the heating component 7 extends into the pump chamber 2 from the radial direction of the pump body 1. Extending the heating component into the pump chamber from the radial direction of the pump body avoids forming a plane angle between the heating component and the impeller, which causes noise to be generated when the liquid circulates in the pump chamber. At the same time, under the action of the angle, trickling is generated, which impacts the pump chamber wall, and long-term use affects the service life of the pump body.

[0220] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0221] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0222] All features disclosed in this specification (including accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification (including accompanying claims, abstracts and drawings) may be combined in any combination, except that at least some of such features and / or processes or units are mutually exclusive. Unless otherwise expressly stated, each feature disclosed in this specification (including accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0223] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims below, any one of the claimed embodiments may be used in any combination.

[0224] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of multiple such elements. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

[0225] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A pump for a washing device, comprising Pump body (1); The pump body (1) forms a pump chamber (2) for containing liquid by means of a first pump shell (1.1) and a second pump shell (1.2) that are fastened together; The pump body (1) is provided with a liquid inlet (3) and a liquid outlet (4) which are communicated with the pump chamber (2); An impeller (5) connected to a motor (6) is disposed in the pump chamber (2); Features: Also includes A second pressure switch (8.2) disposed at the liquid outlet (4) of the pump body (1) and sensing the liquid flowing through the liquid outlet (4); A heating component (7) extending from the outside of the pump body (1) into the pump chamber (2) and heating the liquid in the pump chamber (2); The impeller (5) divides the pump chamber (2) into a first chamber (2.1) close to the liquid inlet (3) and a second chamber (2.2) far from the liquid inlet (3); The heating component (7) is arranged in the second chamber (2.2), and the projection of the liquid outlet (4) in the pump chamber (2) at least covers the impeller (5) and a part of the heating component (7); A circulation hole (5.1) disposed on the impeller (5) body, allowing the liquid in the second chamber (2.2) to flow back to the impeller (5) and out of the liquid outlet (4); The impeller (5) comprises a first wheel body (5.2) having a shape that matches that of the first pump casing (1.1) and a second wheel body (5.3) on which blades (5.8) are mounted; The first wheel body (5.2) is provided with a water inlet (5.4) corresponding to the liquid inlet (3); On the second wheel body (5.3), at least one circulation hole (5.1) is provided between the two blades (5.8); A liquid outlet cavity (5.5) is formed between the first wheel body (5.2) and the second wheel body (5.3).

2. A pump for a washing device according to claim 1, characterized in that: The liquid flows into the pump chamber (2) through the liquid inlet (3), flows through the impeller (5) and the heating component (7) in sequence, and then flows out from the liquid outlet (4).

3. A pump for a washing device according to claim 1, characterized in that: The liquid flows into the impeller (5) through the liquid inlet (3), forming a drainage along the blades (5.8). A first water path (5.6) that flows through the liquid outlet cavity (5.5) and out of the liquid outlet (4); The liquid flows through the liquid outlet cavity (5.5), enters the second chamber (2.2), and flows back to the liquid outlet cavity (5.5) from the circulation hole (5.1) provided on the second wheel body (5.3), and finally converges into the second water path (5.7) where the first water path (5.6) flows out from the liquid outlet (4).

4. A pump for a washing device according to claim 3, characterized in that: The diameter of the circulation hole (5.1) is greater than or equal to 5% of the diameter of the impeller (5).

5. The pump for a washing device according to claim 1, characterized in that: The liquid inlet (3) comprises a drainage wall (9) extending into the pump chamber (2); The drainage wall (9) extends into a water inlet (5.4) provided on the first wheel body (5.2) to guide the liquid flowing through the liquid inlet (3) into the liquid outlet cavity (5.5) of the impeller (5).

6. A pump for a washing device according to claim 1, characterized in that: At least one protrusion (5.9) is arranged at intervals on a side of the blade (5.8) facing the first wheel body (5.2); Corresponding to the protrusions (5.9) provided on the blades (5.8), corresponding small holes (5.10) are provided on the first wheel body (5.2); When the first wheel body (5.2) and the second wheel body (5.3) are buckled together, the protrusion (5.9) passes through the small hole (5.10), and after melting treatment, the first wheel body (5.2) and the second wheel body (5.3) form an integral structure.

7. A pump for a washing device according to claim 6, characterized in that: The blade (5.8) is a vortex-shaped fan blade arranged on the second wheel body (5.3) and extending from the rotation center of the impeller (5) to the edge of the impeller (5); As the blades (5.8) extend toward the edge of the impeller (5), the width of the blades (5.8) gradually decreases.

8. A pump for a washing device according to claim 7, characterized in that: The number of blades (5.8) is a prime number; The outlet angle (5.11) formed by the extension line of the blade (5.8) and the tangent line of the rotation of the blade (5.8) is between 30° and 50°.

9. A pump for a washing device according to any one of claims 6 to 8, characterized in that: The inner wall of the pump body (1) is designed with an involute, and a water retaining rib (21) is formed by extending the involute at the inner wall of the pump chamber (2) near the liquid outlet.

10. A pump for a washing device according to claim 9, characterized in that: The ratio of the area of ​​the liquid outlet (4) blocked by the water retaining rib (21) to the area of ​​the liquid outlet (4) is less than or equal to 0.

67.

11. A pump for a washing device according to claim 9, characterized in that: The inner wall of the pump body (1) adopts an involute design, and the involute angle (1.3) is between 3° and 7°.

12. A pump for a washing device according to claim 11, characterized in that: The ratio of the diameter of the impeller (5) to the diameter of the pump body (1) is between 0.75 and 0.

85.

13. The pump of a washing device according to claim 1, characterized in that: The liquid outlet (4) is provided with a liquid outlet pipe (10); The liquid outlet pipe (10) is provided with a first mounting seat (11) for fixing the second pressure switch (8.2).

14. A pump for a washing device according to claim 13, characterized in that: The second pressure switch (8.2) senses the liquid level in the pump chamber (2) to form a sensing plane.

15. A pump for a washing device according to claim 13, characterized in that: The heating component (7) extends into the pump cavity (2) from the radial direction of the pump body (1).

16. A pump for a washing device according to claim 15, characterized in that: The heating component (7) comprises A heating tube (7.1) and a fuse and a heating wire arranged inside the heating tube (7.1); A first heating unit (7.4), a second heating unit (7.5) and a third heating unit (7.6) are sequentially arranged and connected to the heating pipe (7.1) and the pump body (1) by means of the bolts (7.2) passing through and cooperating with the nuts (7.3).

17. A pump for a washing device according to claim 16, characterized in that: The heating tube (7.1) comprises an arc segment (7.1.1), a first straight segment (7.1.2) and a second straight segment (7.1.3); The first straight line segment (7.1.2) is connected to one end of the arc segment (7.1.1), and the second straight line segment (7.1.3) is connected to the other end of the arc segment (7.1.1); The fuse is arranged in at least one of the first straight segment (7.1.2) and the second straight segment (7.1.3) and is away from the arc segment (7.1.1); The heating tube (7.1) extends from the side of the pump body (1) into the second chamber (2.2) in the pump chamber (2); The arc segment (7.1.1) surrounds the impeller (5) and is spaced apart from the impeller (5).

18. A pump for a washing device according to claim 17, characterized in that: The arc segment (7.1.1), the first straight segment (7.1.2) and the second straight segment (7.1.3) of the heating tube (7.1) are located in the same plane, forming a heating plane for heating the liquid flowing through.

19. A pump for a washing device according to claim 16, characterized in that: The first heating unit (7.4) forms a cover or a shell or a gland, and is arranged to extend outward from the pump chamber (2) to achieve sealing of the second heating unit (7.5) in the pump chamber (2); The first heating unit (7.4) prevents the second heating unit (7.5) from being heated and deformed in the installation direction of the bolt (7.2).

20. A pump for a washing device according to claim 19, characterized in that: The second heating unit (7.5) cooperates with the mounting groove (20) on the pump body (1) and the third heating unit (7.6), and extends from the outside of the pump body (1) to the inside into the pump chamber (2), and under the action of the first heating unit (7.4), achieves sealing in the pump chamber (2).

21. A pump for a washing device according to claim 20, characterized in that: The third heating unit (7.6) cooperates with the mounting groove (20) on the pump body (1) to press the second heating unit (7.5) and the mounting groove (20) of the pump body (1) from the outside of the pump body (1) to the inside, thereby achieving sealing of the second heating unit (7.5).

22. A pump for a washing device according to claim 21, characterized in that: The first heating unit (7.4), the second heating unit (7.5) and the third heating unit (7.6) cooperate with the mounting groove (20) provided on the pump body (1) to form a mounting plane.

23. A pump for a washing device according to any one of claims 19 to 22, characterized in that: The sensing plane for sensing the liquid level in the pump chamber (2) by the second pressure switch (8.2) is not lower than the heating plane for heating the liquid in the pump chamber (2) by the heating component (7), and / or the mounting plane formed by the heating component (7) and the mounting groove (20) provided on the pump body (1).

24. A pump for a washing device according to claim 23, characterized in that: The heating plane and the mounting plane are coplanar.

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