Heating pump and dish washing machine

Abstract

The utility model discloses a heating pump and dish-washing machine relates to dish-washing machine technical field, wherein the heating pump includes pump body, heating pipe, motor, impeller, elastic pad and waterless protection switch, the pump body has water inlet, water outlet, forms the pump cavity inside, the outer wall of pump body has the installation cavity that communicates pump cavity and outside; the heating pipe is located in the pump cavity and used for heating water in the pump cavity. The motor is mounted on the pump body; the impeller is positioned in the pump body and is in transmission connection with the motor; the elastic cushion is mounted in the mounting cavity; the water-free protection switch is installed on the outer side of the elastic cushion and used for controlling starting and closing of the heating pipe. The elastic cushion is ejected outwards under the action of pressure in the pump cavity so as to trigger the no-water protection switch; when the stress of the elastic cushion is more than 1N, the elastic cushion is ejected outwards, the water-free protection switch is triggered, and the heating pipe is started. According to the technical scheme, production can be facilitated, and the manufacturing cost can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of dishwasher technology, and in particular to a heat pump and a dishwasher using the heat pump. Background Technology

[0002] With the rapid development of technology, automated home appliances are offering more functions to better serve people's lives. For example, automatic dishwashers can heat the water within a pump body while driving it, making it easier to wash dishes and providing convenience. Traditional dishwashers on the market use heat pumps with protective devices such as fuses and circuit breakers, mounted on a metal heat-conducting plate, which is difficult to manufacture and costly. Therefore, there is a need to design a heat pump that is easy to manufacture and has a lower cost. Utility Model Content

[0003] The main objective of this invention is to propose a heating pump and an automatic dishwasher, which aims to reduce production costs and facilitate manufacturing.

[0004] To achieve the above objectives, the present invention provides a heating pump for use in a dishwasher, comprising:

[0005] The pump body has an inlet and an outlet, and a pump cavity is formed inside the pump body. The outer wall of the pump body has an installation cavity that connects the pump cavity to the outside.

[0006] A heating element, located inside the pump chamber, is used to heat the water inside the pump chamber;

[0007] An electric motor is mounted on the pump body;

[0008] An impeller is located within the pump body and is connected to the motor via a drive.

[0009] An elastic pad is installed at the mounting cavity location;

[0010] A waterless protection switch is installed on the outside of the elastic pad and is used to control the start and stop of the heating tube;

[0011] The elastic pad is pushed outward under the pressure inside the pump chamber to trigger the waterless protection switch; when the force on the elastic pad is greater than 1N, it is pushed outward, triggering the waterless protection switch and starting the heating tube.

[0012] In one embodiment, the pump body includes an upper pump housing and a lower pump housing, the lower pump housing protruding away from the upper pump housing to form a protruding post, and forming a receiving cavity communicating with the pump chamber within the protruding post; the mounting cavity is located on the protruding post and outside the receiving cavity, and the elastic pad and the lower pump housing form a cavity communicating with the receiving cavity.

[0013] In one embodiment, the pump body further includes a fixing plate located within the pump body and connected to the lower pump housing; the fixing plate and the upper pump housing form the pump cavity; the fixing plate has a communication port for connecting the pump cavity and the receiving cavity.

[0014] In one embodiment, the heating pump further includes a housing mounted on the motor, a waterless protection switch mounted on the housing, and the waterless protection switch being correspondingly disposed with the elastic pad.

[0015] In one embodiment, the periphery of the mounting cavity is recessed inward to form a positioning groove; the elastic pad includes a pressing edge ring, a connecting ring, and a triggering part connected sequentially from the outside to the inside, the pressing edge ring is located in the positioning groove, and the connecting ring and the triggering part are located in the mounting cavity; the outer shell has a clamping part for pressing the elastic pad.

[0016] In one embodiment, the motor includes a stator sleeved outside the protruding post and a rotor located within the receiving cavity; the rotor includes a rotating shaft, a mounting sleeve, a magnetic component, and two bearings; the mounting sleeve is sleeved on the rotating shaft, the magnetic component is mounted on the mounting sleeve, and both bearings are sleeved on the rotating shaft and located on both sides of the mounting sleeve.

[0017] In one embodiment, the bottom wall of the mounting cavity is provided with a connecting hole for connecting the mounting cavity and the receiving cavity, one of the bearings is located in the connecting hole, and the other bearing is mounted on the fixing plate; the inner wall of the connecting hole has a through groove for connecting the receiving cavity and the mounting cavity.

[0018] In one embodiment, the diameter of the connecting hole is smaller than the diameter of the trigger portion.

[0019] In one embodiment, the diameter of the clamping part at the end near the waterless protection switch is smaller than the diameter of the end of the clamping part away from the waterless protection switch.

[0020] In one embodiment, the pump body is further provided with a flow guide shell, which covers the impeller and extends from the inlet side to the impeller side.

[0021] In one embodiment, the outer casing is fastened to the lower pump housing.

[0022] This invention also proposes a dishwasher that includes the aforementioned heating pump.

[0023] Compared to the traditional, complex method of installing fuses onto heating elements, this invention features a simpler installation structure for each component. The pump body's mounting cavity provides a convenient and precise installation position for the waterless protection switch, and the elastic pad only needs to be tightly fitted into the mounting cavity, requiring no complex processes or specialized tools. The entire installation process is simple to operate, significantly shortening production and installation time, substantially improving production efficiency, and reducing labor costs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of an embodiment of the heating pump provided by this utility model;

[0026] Figure 2 A schematic diagram of the internal structure of an embodiment of the heating pump provided by this utility model;

[0027] Figure 3 for Figure 2 Enlarged view of a partial structure in the embodiment;

[0028] Figure 4 A schematic diagram of the assembly of the upper and lower pump housings in an embodiment of the heating pump provided by this utility model;

[0029] Figure 5 A schematic diagram of another embodiment of the heating pump provided by this utility model;

[0030] Figure 6 A schematic diagram of the heating tube structure of an embodiment of the heating pump provided by this utility model.

[0031] Explanation of icon numbers:

[0032] 10. Pump body; 11. Inlet; 12. Outlet; 13. Pump chamber; 14. Mounting chamber; 141. Positioning groove; 142. Connecting hole; 143. Through groove; 15. Upper pump casing; 16. Lower pump casing; 161. Protruding column; 162. Receiving cavity; 163. Cavity; 17. Fixing plate; 171. Connecting port; 20. Heating tube; 21. Fuse; 30. Motor; 31. Stator; 32. Rotor; 321. Shaft; 322. Mounting sleeve; 323. Magnetic component; 324. Bearing; 40. Impeller; 50. Elastic pad; 51. Pressing ring; 52. Connecting ring; 53. Trigger; 60. Waterless protection switch; 70. Housing; 80. Flow guide shell.

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] Heat pumps on the market are difficult to manufacture and have high costs. Therefore, this utility model proposes a heat pump that is simple to manufacture.

[0038] Please see Figures 1 to 4 In one embodiment of this utility model, the heating pump is used in a dishwasher and includes a pump body 10, a heating element 20, a motor 30, and an impeller 40. The pump body 10 has an inlet 11 and an outlet 12. A pump chamber 13 is formed inside the pump body 10, and an installation cavity 14 for connecting the pump chamber 13 to the outside is formed on the outer wall of the pump body 10. Most of the heating element 20 is located inside the pump chamber 13 and is used to heat the water inside the pump chamber 13. The motor 30 is mounted on the pump body 10, and the impeller 40 is located inside the pump body 10 and is drivenly connected to the motor 30. An elastic pad 50 is installed at the installation cavity 14 to close the installation cavity 14 and protrudes outward under the pressure inside the pump chamber 13. A waterless protection switch 60 is installed on the outside of the elastic pad 50 and is used to control the start and stop of the heating element 20. The elastic pad 50 is pushed outward under the action inside the pump chamber 13 to trigger the waterless protection switch 60. When the elastic pad 50 is subjected to a force of more than 1N, it pushes outward. At this time, the waterless protection switch 60 is triggered, and the heating tube 20 is started.

[0039] Specifically, the pump body 10 serves as the fundamental support structure of the entire heating pump system, providing a stable mounting platform for the heating element 20, motor 30, impeller 40, elastic pad 50, and waterless protection switch 60. The inlet 11 and outlet 12 ensure normal water circulation within the pump chamber 13, while the mounting cavity 14, while ensuring the stable installation of the elastic pad 50, provides a mounting position for the waterless protection switch 60 and establishes a pressure transmission channel between the pump chamber 13 and the waterless protection switch 60. The heating element 20 directly heats the water within the pump chamber 13, and its operating state is controlled by the waterless protection switch 60. The motor 30 drives the impeller 40 to rotate, and the rotation of the impeller 40 causes a strong water flow circulation within the pump chamber 13. This circulation accelerates heat transfer in the water, making the water temperature more uniform; furthermore, when water enters the pump chamber 13, the rotation of the impeller 40 generates pressure. When the pump chamber 13 is full of water, the pressure is transmitted through the pump chamber 13 to the mounting chamber 14, and then to the elastic pad 50. When subjected to a force of 1N or more, the elastic pad 50 will bulge outward to apply a pressure of 1N or more to the waterless protection switch 60, triggering the waterless protection switch 60 and activating the heating element 20. However, when the pump chamber 13 is not full or is empty, the pressure generated by the rotation of the impeller 40 is less than 1N, and the elastic pad 50 cannot bulge outward due to a force of less than 1N, thus failing to trigger the waterless protection switch 60, and the heating element 20 remains closed. Therefore, the water circulation generated by the rotation of the impeller 40 not only helps to distribute heat evenly but also creates conditions for the waterless protection switch 60 to sense pressure changes within the pump chamber 13, maintaining a stable pressure environment within the pump chamber 13.

[0040] The elastic pad 50 fits tightly against the mounting cavity 14, achieving a sealing function to prevent water leakage. Simultaneously, it transmits the pressure within the pump cavity 13 to the waterless protection switch 60. When there is water in the pump cavity 13 and the pressure reaches a certain level, the elastic pad 50 is pushed outward by the pressure generated by the rotation of the impeller 40, contacting the contacts on the waterless protection switch 60 and applying pressure to it. When the elastic pad 50 is pushed up by the water pressure and comes into contact with the contacts, and the pressure exerted on the contacts exceeds 1N, the waterless protection switch 60 is triggered, and the heating element 20 starts heating water. When there is no water in the pump cavity 13 or the water pressure is insufficient, the pressure generated by the rotation of the impeller 40 cannot push up the elastic pad 50, the waterless protection switch 60 is not subjected to contact pressure, and the heating element 20 remains closed, effectively preventing the heating element 20 from dry-burning in the absence of water or when the water level is too low, ensuring safe system operation.

[0041] It should be noted that when the pressure inside pump chamber 13 exceeds 1N, the elastic pad 50 pushes outward and transmits the force to the waterless protection switch 60. Tests have shown that when there is sufficient water inside pump chamber 13, such as... Figure 5 As shown, when the pump chamber 13 is full of water, the flow rate is 3 m3 / h. The force on the valve increases with the speed of the impeller 40. When the speed is 2000 rpm, the force on the valve is 1.73 N, and when the speed is 3400 rpm, the force on the valve is 6.52 N. That is, the elastic pad 50 can be pushed out by the force between 1.73 N and 6.52 N, and the waterless protection switch 60 will be triggered.

[0042] Compared to the traditional, complex method of installing the fuse 21 onto the heating element 20, this solution features a simpler installation structure for each component. The mounting cavity 14 of the pump body 10 provides a convenient and precise installation position for the waterless protection switch 60. The elastic pad 50 only needs to be tightly fitted into the mounting cavity 14, requiring no complex processes or specialized tools. The entire installation process is simple to operate, significantly shortening production and installation time, greatly improving production efficiency, and reducing labor costs. The waterless protection switch 60 and the elastic pad 50 work in tandem based on the pressure generated by the rotation of the impeller 40, allowing the starting and stopping of the heating element 20 to be controlled according to the water pressure in the pump cavity 13. When there is no water or the water level in the pump cavity 13 is too low, the pressure generated by the rotation of the impeller 40 cannot push up the elastic pad 50, the waterless protection switch 60 cannot be triggered, and the heating element 20 shuts off in time. This fundamentally eliminates safety hazards such as fires and equipment damage caused by the dry burning of the heating element 20, providing reliable protection for the safe and stable operation of the dishwasher, and improving product safety and user experience.

[0043] Furthermore, the pump body 10 includes an upper pump housing 15 and a lower pump housing 16. The lower pump housing 16 protrudes away from the upper pump housing 15 to form a protruding post 161, and a receiving cavity 162 is formed in the protruding post 161. The receiving cavity 162 communicates with the pump cavity 13. The mounting cavity 14 is located on the protruding post 161 and is located outside the receiving cavity 162. The elastic pad 50 and the lower pump housing 16 form a cavity 163 that communicates with the receiving cavity 162.

[0044] Specifically, in this embodiment, the pump body 10 is composed of a pump housing and a lower pump housing 16, which together form the basic structure of the heating pump. The lower pump housing 16 protrudes away from the upper pump housing 15, forming a protruding post 161. A receiving cavity 162 is formed inside the protruding post 161, which communicates with the pump chamber 13. A mounting cavity 14 located on the protruding post 161 is used to install an elastic pad 50. The elastic pad 50 and the lower pump housing 16 enclose each other to form a cavity 163 that communicates with the receiving cavity 162. The receiving cavity 162 communicates with the pump chamber 13, and together with the cavity 163 formed by the elastic pad 50 and the lower pump housing 16, a stable and efficient pressure transmission path is constructed. When the impeller 40 rotates and generates pressure inside the pump chamber 13, the pressure is precisely transmitted to the elastic pad 50 through the cavity 163 formed by the pump chamber 13, the receiving cavity 162, the elastic pad 50, and the lower pump housing 16, thereby controlling the waterless protection switch 60 and ensuring accurate control of the working status of the heating element 20. The upper pump housing 15 and the lower pump housing 16 can be made of high-strength polypropylene (PP) material. This material has good mechanical strength, can withstand the impact of internal water flow and external mechanical stress, and also has excellent chemical corrosion resistance, resisting the corrosion of chemicals such as detergents in dishwashers.

[0045] Furthermore, the pump body 10 also includes a fixing plate 17, which is located inside the pump body 10 and connected to the lower pump housing 16; a pump cavity 13 is formed between the fixing plate 17 and the upper pump housing 15; the fixing plate 17 has a communication port 171 for connecting the pump cavity 13 and the receiving cavity 162.

[0046] Specifically, the pump body 10 is composed of an upper pump housing 15, a lower pump housing 16, and a fixing plate 17. The fixing plate 17 is located inside the pump body 10 and connected to the lower pump housing 16. The space between the fixing plate 17 and the upper pump housing 15 together forms the pump cavity 13. The fixing plate 17 also has a connecting port 171, which cleverly connects the pump cavity 13 to the receiving cavity 162. The fixing plate 17 is firmly connected to the lower pump housing 16 and, together with the upper pump housing 15, forms the pump cavity 13. The receiving cavity 162 seamlessly connects to the pump cavity 13 through a specific channel, and the connecting port 171 on the fixing plate 17 becomes a key node for pressure transmission between the pump cavity 13 and the receiving cavity 162. The mounting cavity 14 provides a mounting position for the elastic pad 50. The elastic pad 50 fits tightly against the edge of the mounting cavity 14 to achieve a seal, and it is connected to the cavity 163 and the receiving cavity 162 formed by the elastic pad 50 and the lower pump housing 16. This allows the pressure generated by the rotation of the impeller 40 in the pump cavity 13 to be transmitted sequentially through the pump cavity 13, the connecting port 171 of the fixing plate 17, and the receiving cavity 162 to the cavity 163 formed by the elastic pad 50 and the lower pump housing 16, and finally act on the elastic pad 50. The fixing plate 17 can be fixed to the lower pump housing 16 with screws.

[0047] Furthermore, the heating pump also includes a housing 70 mounted on the motor 30, a waterless protection switch 60 mounted on the housing 70, and the waterless protection switch 60 is correspondingly arranged with the elastic pad 50.

[0048] Specifically, in this embodiment, the heating pump is also equipped with a housing 70, which is connected to the motor 30 to fix the position of the motor 30. A waterless protection switch 60 is mounted on the housing 70 of the motor 30 and is correspondingly positioned to correspond with the elastic pad 50. The housing 70 of the motor 30 provides a new mounting position for the waterless protection switch 60. This design is compatible with the overall pump body 10 structure, making the installation process more convenient. Compared to traditional installation methods, mounting the waterless protection switch 60 on the housing 70 of the motor 30 avoids installation operations in other complex locations, reducing installation difficulty. At the same time, this layout makes the connection relationships between components clearer and more reasonable, facilitating production assembly and subsequent maintenance, and improving production assembly efficiency.

[0049] When the impeller 40 rotates in the pump chamber 13, it generates pressure. The pressure acts on the elastic pad 50 through the internal transmission path of the pump body 10. The elastic pad 50 undergoes a displacement change, which is transmitted to the contact of the corresponding waterless protection switch 60, thereby controlling the start and stop of the heating tube 20.

[0050] The housing 70 of the motor 30 is made of an insulating, corrosion-resistant, and relatively strong plastic material, such as engineering plastic ABS. ABS plastic not only effectively protects the motor 30 from external environmental corrosion, such as moisture and detergent in a dishwasher, but also has good insulation properties to prevent electrical leakage and safety issues caused by the motor 30. At the same time, its strength can withstand a certain amount of external impact, protecting the internal structure of the motor 30.

[0051] Furthermore, the outer casing 70 is fastened to the lower pump casing 16.

[0052] Specifically, the lower pump housing 16 is provided with a protruding post 161, and a buckle is provided on the protruding post 161. The outer housing 70 is provided with a corresponding slot at the buckle position. The buckle usually has a certain elasticity and tilt angle to facilitate engagement with the slot. The shape and size of the slot match the buckle to ensure that the two can be tightly engaged. This engagement structure is reasonably designed, making the connection between the lower pump housing 16 and the outer housing 70 both stable and easy to operate.

[0053] Furthermore, the periphery of the mounting cavity 14 is recessed inward to form a positioning groove 141; the elastic pad 50 includes a pressing ring portion 51, a connecting ring portion 52 and a trigger portion 53 connected sequentially from the outside to the inside, the pressing ring portion 51 is located in the positioning groove 141, and the connecting ring portion 52 and the trigger portion 53 are located in the mounting cavity 14; the housing 70 has a clamping portion for pressing the elastic pad 50.

[0054] Specifically, in this embodiment, the mounting cavity 14 is located on the protruding post 161 of the pump body 10, and its periphery is recessed inward to form a positioning groove 141, which is used to accurately position the elastic pad 50. The elastic pad 50 is formed by connecting the pressing ring 51, the connecting ring 52 and the triggering part 53 from the outside to the inside. The pressing ring 51 can be embedded in the positioning groove 141 around the mounting cavity 14, which plays a role in fixing and initial sealing; the connecting ring 52 and the triggering part 53 are located in the mounting cavity 14, and the triggering part 53 is used to sense pressure changes and transmit signals. The motor 30 housing 70 is provided with a clamping part for pressing the elastic pad 50, which can further stabilize the installation of the elastic pad 50. At the same time, the waterless protection switch 60 is installed on the motor 30 housing 70 and is correspondingly arranged with the triggering part 53 of the elastic pad 50.

[0055] This application achieves precise positioning of the elastic pad 50 by tightly engaging the positioning groove 141 of the mounting cavity 14 with the pressing ring 51 of the elastic pad 50. The pressing part of the motor housing 70 presses down on the elastic pad 50, ensuring that the elastic pad 50 is securely installed. The trigger part 53 of the elastic pad 50 corresponds to the position of the waterless protection switch 60 installed on the motor housing 70. When the trigger part 53 is displaced due to pressure changes in the pump cavity 13, it can promptly transmit the change to the waterless protection switch 60.

[0056] Furthermore, the motor 30 includes a stator 31 sleeved outside the protruding post 161 and a rotor 32 located in the receiving cavity 162; the rotor 32 includes a rotating shaft 321, a mounting sleeve 322, a magnetic element 323, and two bearings 324. The mounting sleeve 322 is sleeved on the rotating shaft 321, the magnetic element 323 is mounted on the mounting sleeve 322, and the two bearings 324 are both sleeved on the rotating shaft 321 and located on both sides of the mounting sleeve 322.

[0057] Specifically, the motor 30 consists of a stator 31 and a rotor 32. The stator 31 is fitted onto the outside of the protruding column 161 of the pump body 10, providing the magnetic field foundation for the operation of the motor 30. The rotor 32 is located in the receiving cavity 162 within the protruding column 161 of the pump body 10, and specifically includes a rotating shaft 321, a mounting sleeve 322, a magnetic component 323, and two bearings 324. The rotating shaft 321 is the core rotating component, and the mounting sleeve 322 is tightly fitted onto the rotating shaft 321. The magnetic component 323 is mounted on the mounting sleeve 322, achieving synchronous rotation with the rotating shaft 321 through the mounting sleeve 322. The two bearings 324 are respectively fitted onto the rotating shaft 321 and are located on both sides of the mounting sleeve 322, providing support for the stable rotation of the rotating shaft 321. The rotating shaft 321 is a one-piece slender structure with a smooth surface, ensuring that the mounting sleeve 322 and bearings 324 can be smoothly fitted in. The mounting sleeve 322 is cylindrical, with an internal bore that precisely matches the outer diameter of the rotating shaft 321. Its outer surface has specific grooves or threads to facilitate the secure installation of the magnetic component 323. The magnetic component 323 is manufactured to a suitable shape (such as a tile or ring) according to the design requirements of the motor 30, and is fixed to the outer surface of the mounting sleeve 322 by adhesive bonding, snap-fit ​​connections, or other methods. The bearing 324 is a standard ball or roller bearing 324. Its inner ring fits tightly with the rotating shaft 321, while its outer ring has a certain clearance from the inner wall of the receiving cavity 162, ensuring both flexible rotation of the rotating shaft 321 and tolerance to vibrations during operation.

[0058] The stator 31 is fitted outside the protruding post 161 and interacts with the rotor 32 located in the receiving cavity 162 through the principle of electromagnetic induction. When the winding of the stator 31 is energized to generate a rotating magnetic field, the magnetic component 323 on the rotor 32 is subjected to the magnetic force, which drives the rotating shaft 321 and the mounting sleeve 322 to rotate together.

[0059] This application cleverly utilizes the existing structural space of the pump body 10 by placing the stator 31 and rotor 32 of the motor 30 outside the protruding column 161 and inside the receiving cavity 162, respectively, thus achieving a compact layout of the motor 30 and the pump body 10. This layout not only saves overall space.

[0060] Furthermore, the bottom wall of the mounting cavity 14 is provided with a connecting hole 142 for connecting the mounting cavity 14 and the receiving cavity 162, one bearing 324 is located in the connecting hole 142, and the other bearing 324 is mounted on the fixing plate 17; the side of the connecting hole 142 has a through groove 143 for connecting the receiving cavity 162 and the mounting cavity 14.

[0061] Specifically, in this embodiment, a connecting hole 142 is provided on the bottom wall of the mounting cavity 14, which serves to connect the mounting cavity 14 and the receiving cavity 162, and is an important channel for the transmission of pressure and media between the two cavities. One of the two bearings 324 of the motor 30 rotor 32 is placed inside the connecting hole 142, and the other is mounted on the fixing plate 17. This layout ensures the stable operation of the motor 30 rotor 32 and cleverly utilizes the structural space to achieve a reasonable distribution of mechanical support. The through groove 143 on the side of the connecting hole 142 further enhances the connectivity between the receiving cavity 162 and the mounting cavity 14, making the exchange of materials and pressure transmission between the two cavities smoother and more efficient. The existence of the connecting hole 142 and the through groove 143 allows for a more direct and effective connection between the mounting cavity 14 and the receiving cavity 162. The two originally relatively independent cavities can achieve better pressure balance and media flow through these structures.

[0062] Furthermore, the diameter of the connecting hole 142 is smaller than the diameter of the trigger part 53.

[0063] Specifically, the connecting hole 142, as a key structure connecting the mounting cavity 14 and the receiving cavity 162 on the bottom wall of the mounting cavity 14, is intentionally designed with a diameter smaller than that of the trigger part 53. The trigger part 53, as an important part of the elastic pad 50 that senses pressure changes, has a larger diameter, allowing it to maintain a more stable position within the mounting cavity 14. The smaller diameter of the connecting hole 142, combined with the design of the through groove 143 located on the side wall, ensures that water can directly and evenly apply pressure to the trigger part 53 after entering. Under this stable and uniform pressure, the trigger part 53 can more accurately sense pressure changes transmitted through the mounting cavity 14 within the pump cavity 13. When the pressure reaches a certain level, the trigger part 53 displaces, thereby controlling the waterless protection switch 60, achieving precise control of the heating element 20's operating state, effectively preventing the heating element 20 from dry-burning under abnormal water pressure, and greatly improving the safety and stability of the heating pump system.

[0064] Furthermore, the diameter of the clamping part at the end near the waterless protection switch 60 is smaller than the diameter of the end of the clamping part away from the waterless protection switch 60.

[0065] Specifically, the diameter of the clamping part at the end near the waterless protection switch 60 is smaller than the diameter at the end away from the waterless protection switch 60. This unique shape design gives the clamping part special functional advantages during installation and use. The smaller diameter at the end near the waterless protection switch 60 facilitates better adaptation to the surrounding structure of the waterless protection switch 60, reducing the space occupied during installation. It also facilitates precise positioning and installation. At the same time, with constant pressure, the smaller contact area increases the pressure, enabling more effective triggering of the waterless protection switch 60 and improving its response sensitivity. The larger diameter at the end away from the waterless protection switch 60 provides a wider contact area, enhancing the clamping effect on the elastic pad 50.

[0066] Furthermore, a guide shell 80 is also provided inside the pump body 10. The guide shell 80 covers the impeller 40 and extends from the inlet 11 side to the impeller 40 side.

[0067] Specifically, a key structure, the guide shell 80, is installed inside the pump body 10. The guide shell 80 has a specific streamlined design, tightly covering the outside of the impeller 40, and extends from the inlet 11 side towards the impeller 40 side. Its shape and position are highly adapted to the water flow path inside the pump body 10. The guide shell 80 effectively solves the energy loss problem caused by the large distance between the inlet 11 and the impeller 40. Through its carefully designed streamlined structure, it guides the water flow to the impeller 40 in an orderly and efficient manner, reducing turbulence and energy loss, and significantly improving fluid efficiency. This means that with the same motor 30 power, more water can be delivered, or when delivering the same amount of water, the energy consumption of the motor 30 is reduced, achieving energy-saving effects and improving the overall operating efficiency of the heating pump.

[0068] Please see Figure 6 As shown, a fuse 21 is also installed within the straight section of the heating element 20. When the temperature of the heating element 20 exceeds the safety threshold due to temperature control failure or abnormal operation, the fuse 21 cuts off the power supply by melting, preventing the equipment from continuing to heat up and causing a fire. As a one-time protection component, the fuse 21 provides a last line of defense independent of the temperature control system. Even if the main control system fails, it can still force a power outage through physical melting, ensuring the safe shutdown of the equipment.

[0069] This utility model also proposes a dishwasher, the heating pump of which is described above. The specific structure of the heating pump is as described in the above embodiments. Since this dishwasher adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0070] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A heating pump for a dishwasher, characterized in that, include: The pump body has an inlet and an outlet, and a pump cavity is formed inside the pump body. The outer wall of the pump body has an installation cavity that connects the pump cavity to the outside. A heating element, located inside the pump chamber, is used to heat the water inside the pump chamber; An electric motor is mounted on the pump body; An impeller is located within the pump body and is connected to the motor via a drive. An elastic pad is installed at the mounting cavity location; A waterless protection switch is installed on the outside of the elastic pad and is used to control the start and stop of the heating tube; The elastic pad is pushed outward under the pressure inside the pump chamber to trigger the waterless protection switch; when the force on the elastic pad is greater than 1N, it is pushed outward, triggering the waterless protection switch and starting the heating tube.

2. The heating pump as described in claim 1, characterized in that, The pump body includes an upper pump housing and a lower pump housing. The lower pump housing protrudes away from the upper pump housing to form a protruding post, and a receiving cavity communicating with the pump chamber is formed in the protruding post. The mounting cavity is located on the protruding post and outside the receiving cavity. The elastic pad and the lower pump housing form a cavity communicating with the receiving cavity.

3. The heating pump as described in claim 2, characterized in that, The pump body further includes a fixing plate located inside the pump body and connected to the lower pump housing; the fixing plate and the upper pump housing form the pump cavity; the fixing plate has a communication port for connecting the pump cavity and the receiving cavity.

4. The heating pump as described in claim 3, characterized in that, The heating pump also includes a housing mounted on the motor, a waterless protection switch mounted on the housing, and the waterless protection switch is correspondingly arranged with the elastic pad.

5. The heating pump as described in claim 4, characterized in that, The periphery of the mounting cavity is recessed inward to form a positioning groove; the elastic pad includes a pressing edge ring, a connecting ring, and a triggering part connected sequentially from the outside to the inside, the pressing edge ring is located in the positioning groove, and the connecting ring and the triggering part are located in the mounting cavity; the outer shell has a pressing part for pressing the elastic pad.

6. The heating pump as described in claim 5, characterized in that, The motor includes a stator sleeved outside the protruding post and a rotor located inside the receiving cavity; the rotor includes a rotating shaft, a mounting sleeve, a magnetic component, and two bearings; the mounting sleeve is sleeved on the rotating shaft, the magnetic component is mounted on the mounting sleeve, and both bearings are sleeved on the rotating shaft and located on both sides of the mounting sleeve.

7. The heating pump as described in claim 6, characterized in that, The bottom wall of the mounting cavity is provided with a connecting hole for connecting the mounting cavity and the receiving cavity, one of the bearings is located in the connecting hole, and the other bearing is mounted on the fixing plate; the inner wall of the connecting hole has a through groove for connecting the receiving cavity and the mounting cavity.

8. The heating pump as described in claim 7, characterized in that, The diameter of the connecting hole is smaller than the diameter of the trigger part.

9. The heating pump as described in claim 8, characterized in that, The diameter of the clamping part at the end near the waterless protection switch is smaller than the diameter of the end of the clamping part away from the waterless protection switch.

10. The heating pump as claimed in claim 4, characterized in that, The pump body is also provided with a flow guide shell, which covers the impeller and extends from the water inlet side to the impeller side.

11. The heating pump as claimed in claim 4, characterized in that, The outer casing is fastened to the lower pump housing.

12. A dishwasher, characterized in that, Including the heating pump as described in any one of claims 1 to 11.

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