Double-temperature-control heating integrated dishwashing pump

Abstract

A double-temperature-control heating integrated dishwashing pump comprises a pump body and a pump shell which are in butt joint with each other, a pump cavity is defined between the pump body and the pump shell, a water inlet and a water outlet are formed in the pump shell, an impeller is arranged in the pump cavity, a motor is connected to one side of the pump body, a main shaft of the motor penetrates through the pump body to be connected with the impeller, and a heating pipe is arranged in the pump shell. The heating pipe is integrally cast and formed in the pump shell, and part of the heating pipe extends into the pump cavity to synchronously heat the pump shell and the pump cavity; a first temperature controller and a second temperature controller are arranged on the pump shell, a first electrode of the heating pipe is connected with a power source after being connected with the first temperature controller in series, and a second electrode of the heating pipe is connected with the power source after being connected with the second temperature controller in series. The water pump has the advantages that the heating pipe is directly arranged in the pump shell in an integrated casting forming mode, and the water pump function and the heating function are combined into a whole.

Description

Technical Field

[0001] This utility model relates to the field of washing appliance technology, specifically a dual-temperature-controlled heating integrated dishwasher pump. Background Technology

[0002] Dishwashers are widely used appliances in modern kitchens. They clean dishes using high-pressure water jets and detergent, and then rinse and sanitize them with hot water to achieve efficient and hygienic cleaning. Water temperature control is crucial during the dishwasher's operation, directly affecting washing and sanitizing performance. Therefore, dishwashers typically require a heating system to maintain the water temperature.

[0003] In existing technology, the heating function of dishwashers is usually achieved through a separate heater. That is, the dishwasher has an independent heating device, typically located at the bottom of the dishwasher's inner tub or in a specific section of the circulating water pipe. The circulating water pump is responsible for drawing water from the bottom of the inner tub, pressurizing it, and sending it to the spray arms. The water is heated by passing through the independent heating device during the circulation process.

[0004] Disadvantage 1: Large space occupation. Independent water pumps and independent heaters each require a certain amount of installation space, which increases the difficulty of layout design for increasingly compact dishwashers and is not conducive to product miniaturization.

[0005] Disadvantage 2: Complex water system connections pose a risk of leakage. Additional piping is required to connect the water pump, heater, and sprinkler system, increasing connection points. This not only increases assembly complexity and cost but also raises potential leakage risks, impacting the product's long-term reliability.

[0006] Disadvantage 3: Relatively low heating efficiency. Water needs to flow from the pump body, through a pipeline to reach the heater, and then flow to the spray arm, resulting in some heat loss. Additionally, the contact area and method between the heater and the water flow may be limited, affecting heating efficiency. Furthermore, current dishwashers typically use a single thermostat or a simple thermal fuse for temperature monitoring and protection. If the single thermostat malfunctions, or if its sensing point fails to accurately reflect the actual maximum temperature, it may lead to uncontrolled water temperature, potentially causing overheating, dry burning, and other dangerous situations, threatening user safety and the product itself. Especially for systems with high heating power, the reliability of a single temperature control protection is insufficient, therefore further improvements are necessary. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a dishwasher heating solution with a more compact structure, simpler connection, higher heating efficiency, and safer temperature control, thereby overcoming the aforementioned defects in the prior art with a dual-temperature control heating integrated dishwasher pump.

[0008] The purpose of this utility model is achieved in the following way: a dual-temperature-controlled heating integrated dishwasher pump, which includes a pump body and a pump casing that are connected to each other. The pump body and the pump casing together form a pump cavity. The pump casing is provided with an inlet and an outlet. An impeller is provided in the pump cavity. A motor is connected to one side of the pump body. The main shaft of the motor passes through the pump body and is connected to the impeller. A heating tube is provided in the pump casing. The heating tube is integrally cast in the pump casing. The heating tube extends into the pump cavity to heat the pump casing and the pump cavity simultaneously.

[0009] The pump casing is equipped with a first temperature controller and a second temperature controller. The first electrode of the heating tube is connected in series with the first temperature controller and then connected to the power supply. The second electrode of the heating tube is connected in series with the second temperature controller and then connected to the power supply.

[0010] Furthermore: the water inlet is located on the end face of the pump casing, and the water outlet is located on the cylindrical surface of the pump casing; the first electrode and the second electrode of the heating tube are located on the end face of the pump casing and outside the water inlet.

[0011] Furthermore, the pump casing is also provided with a temperature control seat, which is distributed at intervals of more than °, and the first temperature controller and the second temperature controller are fixedly installed in the temperature control seat.

[0012] Furthermore: the temperature control base is a boss set on the end face of the pump casing, and the first temperature controller and the second temperature controller are fitted with a pressure plate to install the first temperature controller and the second temperature controller tightly against the end face of the boss.

[0013] Furthermore, the heating tube is arranged in a multi-turn spiral shape, and the first electrode and the second electrode of the heating tube are positioned near the water outlet.

[0014] The beneficial effects of this utility model are: 1. The heating element is directly installed inside the pump housing by integral casting, combining the water pump function and the heating function into one. This highly integrated design greatly reduces the overall installation space required for the heating system, making the internal layout of the dishwasher more compact and flexible, which is conducive to achieving the miniaturization and lightweight design of the whole machine and meeting the development trend of modern home appliances towards compactness.

[0015] 2. Because the heating function is integrated inside the pump housing, the water is directly heated as it circulates within the pump chamber. Unlike existing technologies, there is no need for additional inlet and outlet water pipes to connect to a separate heater. This significantly simplifies the dishwasher's internal water system, reducing the number of pipes, fittings, and other connections. This not only reduces the complexity and cost of production and assembly but, more importantly, greatly reduces potential leakage risks, improving the long-term reliability and safety of the dishwasher.

[0016] 3. The heating element is integrally cast within the pump casing, with a portion extending directly into or exposed within the pump cavity, directly contacting the washing water circulated by the impeller. Heat can be directly and efficiently transferred to the core water flow within the pump cavity, resulting in a short heat conduction path and minimal heat loss. Compared to independent heaters or external heating elements that require indirect heating, this invention offers higher heating efficiency, faster water temperature response, helps shorten dishwashing cycle time, and may reduce energy consumption.

[0017] 4. In this invention, a first thermostat and a second thermostat are connected in series on the power supply paths of the two electrode live wires and the neutral wire of the heating element, respectively. This dual, independent series temperature control protection mechanism provides extremely high safety redundancy. When either thermostat reaches the set temperature or detects an abnormally high temperature and disconnects, the heating circuit can be cut off, effectively preventing dangerous situations such as continuous heating, uncontrolled water temperature, or even dry burning caused by the failure of a single thermostat. Attached Figure Description

[0018] Figure 1 , 2 This is a rendering of the final assembly of this utility model.

[0019] Figure 3 , 4 This is a schematic diagram of the pump casing structure in this utility model.

[0020] Figure 5 This is a cross-sectional view of the pump casing structure in this utility model. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings. A dual-temperature-controlled heating integrated dishwasher pump includes a pump body 1 and a pump housing 2 connected to each other. The pump body 1 and the pump housing 2 together form a pump cavity 3. The pump housing 2 is provided with an inlet 4 and an outlet 5. An impeller is provided inside the pump cavity 3. A motor 6 is connected to one side of the pump body 1. The main shaft of the motor 6 passes through the pump body 1 and is connected to the impeller. A heating tube 7 is provided inside the pump housing 2. The heating tube 7 is integrally cast inside the pump housing 2, and part of the heating tube 7 extends into the pump cavity 3 to simultaneously heat the pump housing 2 and the pump cavity 3. A first thermostat 8 and a second thermostat 9 are provided on the pump housing 2. The first electrode 71 of the heating tube 7 is connected in series with the first thermostat 8 and then connected to a power source. The second electrode 72 of the heating tube 7 is connected in series with the second thermostat 9 and then connected to a power source.

[0022] After the motor 6 starts, it drives the impeller in the pump chamber 3 to rotate through the main shaft. The high-speed rotation of the impeller does work on the water in the pump chamber, generating centrifugal force, which draws the water in from the inlet 4 on the end face of the pump casing 2, pressurizes it, and discharges it through the outlet 5 on the cylindrical surface of the pump casing 2, forming the circulating water flow required by the dishwasher.

[0023] The heating element 7 is pre-placed in the mold of the pump housing 2 and integrated with the material of the pump housing 2 through a casting process. Since part of the heating element 7 extends into the pump cavity 3, meaning part of its surface is directly exposed to the water, when the heating element 7 is energized and heats up, the heat is transferred through two pathways: part of the heat is directly transferred to the water flowing through the pump cavity 3; the other part of the heat is transferred to the pump housing 2 body, and the pump housing 2 then transfers the heat to the water inside the pump cavity 3. This achieves "synchronous heating" of the pump housing and the water inside the cavity.

[0024] In this circuit, the live wire L and neutral wire N are not directly connected to the two electrodes of the heating element 7. Instead, the live wire L first passes through the first thermostat 8 and then connects to the first electrode 71; the neutral wire N first passes through the second thermostat 9 and then connects to the second electrode 72. The first thermostat 8 and the second thermostat 9 are typically mounted on the pump housing 2 to sense the temperature of the pump body or the water. The heating element 7 can only operate when both thermostats are in the open state, usually when the temperature is below the set value. If either thermostat disconnects due to reaching the set temperature or detecting overheating, the entire heating circuit is cut off, and heating stops.

[0025] Compared to traditional technologies, this design integrates the water pump and heating function into a single pump casing, significantly reducing the number of components and overall space required. Furthermore, since there is no need for an additional water pipe connecting to a separate heater, connection points are reduced, improving system reliability and minimizing the risk of leakage. Additionally, the heating element directly contacts the water inside the pump chamber or transfers heat through the highly efficient heat-conducting pump casing, resulting in direct heat transfer and minimal heat loss.

[0026] Furthermore, thermostats are installed on both the live and neutral wires of the power supply, providing redundant protection. Even if one thermostat fails, the other thermostat can still cut off the circuit, greatly improving the safety of the heating system and effectively preventing overheating.

[0027] In one embodiment, the water inlet 4 is disposed on the end face of the pump housing 2, and the water outlet 5 is disposed on the cylindrical surface of the pump housing 2; the first electrode 71 and the second electrode 72 of the heating tube 7 are disposed on the end face of the pump housing 2 and located outside the water inlet 4.

[0028] During use, water enters axially from the inlet 4 in the center area of ​​one end face of the pump casing 2. After being pressurized by the impeller, it flows radially out from the cylindrical outlet 5 on the side of the pump casing 2. The two electrodes of the heating tube are also arranged on the end face of the pump casing 2, but they do not occupy the inlet area. Instead, they are located on the outside of the inlet area to facilitate external wiring.

[0029] Placing the electrodes on the end face and away from the water inlet makes electrical connection operations convenient, while reducing the impact of water flow on the electrode connection points and improving electrical safety and sealing.

[0030] In one embodiment, the end face of the pump housing 2 is further provided with a temperature control seat 21, the temperature control seats 21 are distributed at intervals of more than 45°, and the first temperature controller 8 and the second temperature controller 9 are fixedly installed in the temperature control seat 21.

[0031] In this case, to reliably install the thermostat and ensure good temperature sensing, two thermostat mounts 21 were specially designed on the end face of the pump casing 2. The thermostat is fixedly installed in these thermostat mounts. The thermostat mounts are directly connected to the pump casing body and can transfer the temperature of the pump casing to the thermostat. The two thermostat mounts are maintained at a certain angular interval of 45 degrees or more to ensure that they are physically separated, can be installed and sense temperature independently, and effectively transfer heat, so that the thermostat can accurately reflect the pump body temperature.

[0032] At the same time, the appropriate spacing facilitates installation and operation, and may allow the two thermostats to monitor slightly different areas of temperature on the pump casing, thereby expanding the temperature sensing range and preventing local blockages from causing excessive temperature rise and damage.

[0033] In one embodiment, the temperature control base 21 is a boss located on the end face of the pump housing 2. A pressure plate 22 is fitted around the first temperature controller 8 and the second temperature controller 9, securing them tightly against the boss's end face. During installation, the temperature controller is placed on the boss's end face, and then pressure is applied from the outside using a pressure plate to press the temperature-sensing surface of the temperature controller firmly against the boss's end face. Applying pressure with the pressure plate eliminates the minute gaps between the temperature-sensing surface of the temperature controller and the boss, ensuring close contact and significantly reducing contact thermal resistance. This allows heat to be transferred quickly and accurately from the pump housing to the temperature controller, improving the response speed and accuracy of temperature control.

[0034] In addition, the pressure plate provides strong mechanical fixing force, which can effectively resist vibration and impact, ensuring that the thermostat always maintains good installation condition and thermal contact during long-term operation.

[0035] In one embodiment, the heating tube 7 is arranged in a multi-turn spiral shape, with the first electrode 71 and the second electrode 72 of the heating tube 7 positioned near the water outlet 5. In this case, the heating tube 7 is no longer a simple straight tube or U-shaped tube, but is designed in a multi-turn spiral shape, coiled inside the pump housing 2. Simultaneously, the positions of its two electrode leads are close to the pump outlet 5. This spiral design allows for a longer heating tube within the limited pump housing space, thereby greatly increasing the contact area between the heating tube and the pump housing material, as well as the water flowing through the pump chamber, improving the heating power and heat exchange efficiency per unit volume. Furthermore, the larger heat exchange area helps to transfer heat to the water flow more quickly and evenly. At the same time, positioning the electrodes near the water outlet facilitates electrical wiring and optimizes the heat field distribution within the pump.

[0036] In summary, in this case, the motor drives the impeller to rotate, drawing water in through the axial inlet, pressurizing it, and then discharging it through the radial outlet, forming a circulating water flow. Simultaneously, a spiral heating tube, integrally cast inside the pump casing and partially extending into the pump cavity, is energized and generates heat. Heat is efficiently heated through both direct contact and conduction through the pump casing, effectively warming the water flowing through the pump cavity.

[0037] To achieve precise and safe temperature control, a thermostat is connected in series with each of the live and neutral wires of the power supply before being connected to the electrodes of the heating element. These two thermostats are reliably mounted on a dedicated boss-type thermostat mount on the pump housing end face and are tightly pressed together by a pressure plate to ensure accurate and rapid sensing of the pump body temperature. If either thermostat reaches its set limit and disconnects, the heating circuit will be completely cut off, and heating will cease.

[0038] This utility model achieves a comprehensive effect of compact structure, simplified connection, high heating efficiency, and safety and reliability through its integrated design that highly integrates pumping, heating, and dual temperature control, combined with an optimized structural layout. It effectively overcomes many shortcomings of the existing technology and can therefore be widely promoted and used.

[0039] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this utility model.

Claims

1. A dual-temperature-controlled heating integrated dishwasher pump, comprising a pump body (1) and a pump housing (2) connected to each other, the pump body (1) and the pump housing (2) forming a pump cavity (3), the pump housing (2) being provided with an inlet (4) and an outlet (5), an impeller being provided inside the pump cavity (3), a motor (6) being connected to one side of the pump body (1), the main shaft of the motor (6) passing through the pump body (1) and connected to the impeller, characterized in that: The pump shell (2) is provided with a heating pipe (7) which is integrally cast in the pump shell (2), and the heating pipe (7) extends into the pump cavity (3) to heat the pump shell (2) and the pump cavity (3) synchronously. The first electrode (71) of the heating pipe (7) is connected with the power supply in series with the first temperature controller (8), and the second electrode (72) of the heating pipe (7) is connected with the power supply in series with the second temperature controller (9).

2. A dual temperature controlled heating integrated warewashing pump as claimed in claim 1, wherein: The water inlet (4) is arranged on the end face of the pump shell (2), and the water outlet (5) is arranged on the cylindrical surface of the pump shell (2); the first electrode (71) and the second electrode (72) of the heating pipe (7) are arranged on the end face of the pump shell (2) and located outside the water inlet (4).

3. A dual temperature controlled heating integrated warewashing pump as claimed in claim 2, wherein: The end face of the pump shell (2) is further provided with a temperature control seat (21), and the temperature control seat (21) is distributed at intervals of more than 45°; the first temperature controller (8) and the second temperature controller (9) are fixedly installed in the temperature control seat (21).

4. A dual temperature controlled heating integrated warewashing pump as claimed in claim 3, wherein: The temperature control seat (21) is a boss arranged on the end face of the pump shell (2), the first temperature controller (8) and the second temperature controller (9) are sleeved with a pressing plate (22), and the first temperature controller (8) and the second temperature controller (9) are installed tightly against the end face of the boss.

5. A dual temperature controlled heating integrated warewashing pump as claimed in claim 1, wherein: The heating pipe (7) is arranged in a multi-turn spiral shape, and the first electrode (71) and the second electrode (72) of the heating pipe (7) are arranged close to the position of the water outlet (5).

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