Converter for heat recovery, heat recovery device comprising same and dish-washing machine

Abstract

The heat recovery converter is used for being matched with an overflow pipe of a dish washing machine, the overflow pipe is sleeved with the converter, an annular flow channel which is continuous in the axial direction is formed between the converter and the overflow pipe, the top of the converter is open, the top of the converter is higher than an overflow opening in the upper portion of the overflow pipe, and at least one fluid inlet is formed in the lower portion of the converter. And the fluid inlet is used for guiding low-temperature waste hot water to enter the converter and rise to the overflow port of the overflow pipe along the annular runner channel to be discharged. By arranging the converter to wrap the overflow pipe, high-temperature waste hot water on the upper layer is prevented from being directly discharged from the overflow port and forced to sink and mix, low-temperature waste hot water after heat exchange enters the annular flow channel through the fluid inlet in the bottom of the converter, rises along the outer wall of the overflow pipe and is discharged from the overflow port, temperature stratification is broken through forced convection, and the water temperature in the heat recovery water tank is more uniform; the overflow pipe maintains the height of the liquid level of the water tank, and the converter ensures that only water subjected to sufficient heat exchange is discharged preferentially, so that waste of heat energy is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of dishwashers, and in particular to a converter for heat recovery. Background Art

[0002] Dishwashers clean tableware in an automated manner, which not only saves manual labor but also provides a more hygienic cleaning effect. The working process of a dishwasher mainly includes two stages: main washing and rinsing. In the main washing stage, high-pressure circulating water is used to effectively remove food residues and oil stains on the tableware, while in the rinsing stage, high-temperature purified water is used to perform the final cleaning and disinfection of the tableware.

[0003] During the rinsing process of the dishwasher, after tap water enters the rinsing water tank, it is heated by a heater, and the water temperature is quickly raised to above 82°C. The rinsing pump then extracts the high-temperature waste hot water above 82°C and sprays it on the surface of the tableware through a spray arm. The high-temperature rinsing water falls back into the main washing water tank after cleaning the tableware, increasing the volume of the circulating water in the main washing water tank. The water in the main washing water tank is pumped out by a large-flow high-lift main washing pump and sprayed on the surface of the tableware again through the main washing spray arm to wash away the residues and oil stains on the tableware. The washed water flows back into the main washing water tank again to achieve recycling.

[0004] However, traditional dishwashers generate a large amount of high-temperature waste hot water during the cleaning process, and these waste hot waters are usually directly discharged, resulting in energy waste. In the prior art, some dishwashers use a heat recovery water tank to collect the waste hot water generated during the cleaning process, and let the purified water for rinsing entering the rinsing water tank first flow through a heat exchange coil placed in the heat recovery water tank for heat exchange, absorbing the heat of the waste hot water in the heat recovery water tank, so as to increase the temperature of the tap water in the heat exchange coil, reduce the temperature difference of temperature rise, and reduce the heating energy consumption of the rinsing water tank. However, since the waste hot water is prone to form temperature stratification in the heat recovery water tank (high-temperature waste hot water is on the upper layer and low-temperature waste hot water is on the lower layer), and it is easy to overflow and be discharged from the high-level overflow port, resulting in low heat exchange efficiency and insufficient heat energy recovery. Therefore, there is an urgent need for a dishwasher structure that can effectively break the temperature stratification and prevent the high-temperature waste heat in the upper layer of the heat recovery water tank from being directly discharged from the high-level overflow port to improve the heat recovery efficiency. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a heat recovery converter.

[0006] The present invention provides a technical solution. The converter is sleeved outside the overflow pipe and a continuous annular flow channel is formed between the converter and the overflow pipe along the axis. The top of the converter is open and the top of the converter is higher than the overflow port at the upper part of the overflow pipe, effectively blocking the direct discharge of the high-temperature waste hot water in the upper layer of the heat recovery water tank from the overflow port. Instead, it gradually settles to the lower layer of the heat recovery water tank, completing the heat transfer from the upper hot water to the low-temperature waste hot water layer at the bottom layer of the heat recovery water tank, raising the water temperature at the bottom layer. At least one fluid inlet is provided at the lower part of the converter. The fluid inlet is used to guide the low-temperature waste hot water into the converter and rise along the annular flow channel to the overflow port of the overflow pipe for discharge, realizing the balance and temperature maintenance of the heat in the upper, middle and lower layers inside the heat recovery water tank.

[0007] Further, the fluid inlet is any one of a plurality of equally spaced water inlet holes, a spiral guiding channel, a grid-like porous structure, a continuous annular opening, a combination form of an intermittent annular opening and a fixed support structure, or a corrugated annular guiding groove structure.

[0008] Further, a first limiting member is provided on the outer periphery of the converter, and the first limiting member is used for cooperative installation with the heat recovery water tank.

[0009] Further, the converter includes a conversion pipe and a base connected to the bottom of the conversion pipe. Both the conversion pipe and the base are cylindrical, and the radius of the base is greater than the radius of the conversion pipe.

[0010] Further, the lower half of the base is in a cylindrical extension structure, and the extension structure is used to extend into the waste hot water drainage seat at the bottom of the heat recovery water tank for sealed connection.

[0011] Further, a plurality of reinforcing ribs are provided inside the base, and the reinforcing ribs are evenly distributed in a spiral shape on the inner wall of the base.

[0012] The present invention also provides a technical solution, including an overflow pipe and the above-mentioned converter. An overflow port is provided at the upper part of the overflow pipe, and the inside of the overflow pipe is a hollow guiding channel; the converter is coaxially sleeved outside the overflow pipe and a continuous annular flow channel is formed between the converter and the overflow pipe along the axis; the top end of the converter extends to a position higher than the overflow port.

[0013] Further, the converter and the overflow pipe are of an integrally formed structure or a detachable connection structure.

[0014] Further, a second limiting member is provided on the outer periphery of the overflow pipe, and the second limiting member is used for cooperative installation with the waste hot water drainage seat at the bottom of the heat recovery water tank.

[0015] The present invention also provides a technical solution, including: a main washing water tank and a heat recovery water tank; the above-mentioned heat recovery device, which is arranged in the heat recovery water tank; a heat exchange coil, which is arranged in the heat recovery water tank and is used for heat exchange with waste hot water to raise the temperature of the purified water for rinsing flowing into the rinsing water tank in the heat exchange coil; a horizontal overflow pipe, which communicates the main washing water tank and the heat recovery water tank and is used for overflowing the waste hot water from the main washing water tank to the heat recovery water tank; the heat recovery device is used to guide the low-temperature waste hot water to enter from the bottom of the converter and rise along the annular flow path to the overflow port for discharge.

[0016] Further, a slag separation and drainage seat is arranged at the bottom of the main washing water tank, and the slag separation and drainage seat includes a slag separation net and a first water collection tank for collecting waste hot water; a waste hot water drainage seat is arranged at the bottom of the heat recovery water tank for discharging waste hot water.

[0017] Further, the slag separation and drainage seat is communicated with the waste hot water drainage seat through a connecting pipe for discharging waste hot water when the dishwasher finishes working.

[0018] Further, the height of the horizontal overflow pipe is greater than or equal to the height of the overflow port.

[0019] Further, a detachable sealing cover is arranged at the top of the heat recovery water tank to prevent the circulating water in the main washing water tank sprayed on the tableware during the operation of the main washing water pump from directly entering the heat recovery water tank, resulting in water shortage in the main washing water tank and blocking the heat dissipation in the heat recovery water tank.

[0020] After adopting the above technical solution, the following beneficial effects are obtained:

[0021] In the present invention, by arranging a converter to wrap the overflow pipe, the upper-layer high-temperature waste hot water is prevented from directly discharging from the overflow port, forcing it to sink and mix. The relatively high-temperature waste hot water that has just overflowed from the main washing water tank sinks to the bottom layer of the heat recovery water tank to complete the heat transfer between the high-temperature waste hot water and the lower-temperature waste hot water at the lower layer. The heat-exchanged low-temperature waste hot water enters the annular flow path through the fluid inlet at the bottom of the converter, rises along the outer wall of the overflow pipe and discharges from the overflow port, breaking the temperature stratification by forced convection, making the water temperature and heat in the heat recovery water tank more uniform, improving the heat absorption efficiency of the heat exchange coil, the overflow pipe maintaining the liquid level of the water tank, and the converter ensuring that only the fully heat-exchanged water is preferentially discharged to avoid waste of heat energy. Description of the Drawings

[0022] Referring to the drawings, the disclosure of the present invention will become more easily understood. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the protection scope of the present invention. In the drawings:

[0023] Figure 1It is a schematic structural diagram of a dishwasher with a heat recovery device in an embodiment of the present invention;

[0024] Figure 2 It is a schematic structural diagram of the heat recovery device in an embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of a current converter in an embodiment of the present invention;

[0026] Figure 4 It is a schematic structural diagram of the interior of a dishwasher sink in an embodiment of the present invention;

[0027] Figure 5 It is a sectional view of a dishwasher with a heat recovery device at an angle in an embodiment of the present invention;

[0028] Figure 6 It is a sectional view of a dishwasher with a heat recovery device at another angle in an embodiment of the present invention;

[0029] Figure 7 It is a front view of the heat recovery device in an embodiment of the present invention.

[0030] Corresponding Table of Reference Numerals:

[0031] 1, main washing water tank; 2, heat recovery water tank; 3, heat exchange coil; 4, horizontal overflow pipe; 5, overflow pipe; 501 overflow port; 502, second limiting member; 6, current converter; 601, current conversion pipe; 602, base; 6021, fluid inlet; 603, annular flow channel; 604, reinforcing rib; 605, first limiting member; 606, extending structure; 7, waste hot water drainage seat; 701, second water collection tank; 7011, waste hot water inlet; 702, second sealing pipe; 7021, waste hot water outlet; 8, vertical drain pipe; 9, slag separation drainage seat; 901, first water collection tank; 902, first sealing pipe; 9021, drain port; 903, slag separation net; 10, dishwasher sink; 11, connecting pipe. Detailed Embodiments

[0032] The following further illustrates the detailed embodiments of the present invention with reference to the accompanying drawings.

[0033] It is easily understood that according to the technical solution of the present invention, without changing the essence of the present invention, there are various structural ways and implementation ways that can be mutually replaced by those of ordinary skill in the art. Therefore, the following detailed embodiments and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction on the technical solution of the invention.

[0034] In this specification, the orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc., which are mentioned or may be mentioned, are defined relative to the structures shown in the respective drawings. They are relative concepts and may therefore change accordingly depending on their different positions and usage states. Therefore, these or other orientation terms should not be construed as restrictive terms. In addition, the terms "first", "second", "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In some embodiments of the present invention, the heat recovery converter 6 is used to cooperate with the overflow pipe 5 of the dishwasher. The converter 6 is sleeved outside the overflow pipe 5 and forms an axially continuous annular flow channel 603 between the converter 6 and the overflow pipe 5. The top of the converter 6 is open and its top is higher than the overflow port at the upper part of the overflow pipe 5. At least one fluid inlet 6021 is provided at the lower part of the converter 6. The fluid inlet 6021 is used to guide the low-temperature waste hot water into the converter 6 and rise along the annular flow channel 603 to be discharged from the overflow port of the overflow pipe 5.

[0037] Specifically, the overflow pipe 5 is vertically installed in the heat recovery water tank 2 and is provided with an overflow port at the upper part for controlling the water level in the tank. When the water level exceeds the height of the overflow port, the excess water is automatically discharged to maintain a constant liquid level in the tank.

[0038] The overflow port is usually located in the upper layer of the water tank (the high-temperature hot water accumulation area). However, due to the wrapping of the converter 6, the high-temperature waste hot water cannot directly enter the overflow port but is forced to flow downward, breaking the natural temperature stratification. The converter 6 is sleeved outside the overflow pipe 5, and an axially continuous narrow annular space is formed between the two as the rising channel for the low-temperature waste hot water. The bottom fluid inlet 6021 is located on the side of the base 602 of the converter 6, guiding the low-temperature waste hot water that has completed heat exchange into the annular flow channel 603. The high-temperature waste hot water in the main washing water tank 1 enters the upper layer of the heat recovery water tank 2 through the horizontal overflow pipe 4 and will naturally float due to its lower density. The presence of the converter 6 blocks its direct overflow, and the high-temperature waste hot water is forced to sink and mix with the low-temperature waste hot water in the lower layer, eliminating the vertical temperature difference and improving the overall heat exchange efficiency. After the cold water in the heat exchange coil 3 absorbs the heat of the water tank, the low-temperature waste hot water enters the annular flow channel 603 through the fluid inlet 6021 and rises along the narrow channel to be discharged from the overflow port. This design ensures that only the low-temperature waste hot water that has been fully heat-exchanged can be preferentially discharged, avoiding the short-circuit escape of the high-temperature waste hot water.

[0039] Working process: (1) Injection of high-temperature waste hot water: The waste hot water in the main washing water tank 1 enters the top of the heat recovery water tank 2 and is blocked by the converter 6. (2) Forced mixing: The high-temperature waste hot water dives and mixes with the low-temperature waste hot water around the coil, strengthening the heat transfer to the coil. (3) Discharge of low-temperature waste hot water: The heat-exchanged low-temperature waste hot water enters the annular flow channel 603 through the fluid inlet 6021, rises to the overflow port and is discharged, forming a one-way cycle.

[0040] Technical effects: By forced convection, the temperature stratification is eliminated, and the coil can continuously contact the uniformly high-temperature waste hot water, improving the heat exchange rate. The structures of the annular flow channel 603 and the fluid inlet 6021 ensure that the water flow path is controllable, avoiding the direct overflow of the high-temperature waste hot water without heat exchange. The sleeve design saves space, and the narrow structure of the annular flow channel 603 enhances the water flow velocity, further promoting mixing. In the dishwasher, this device enables the heat recovery water tank 2 to always maintain a high-temperature and uniform state. The cold water in the heat exchange coil 3 can be quickly heated up, reducing the external heating energy consumption and achieving the purpose of energy saving. At the same time, the stable drainage of the overflow pipe 5 ensures the system water balance, and the guiding function of the converter 6 significantly improves the heat recovery rate (expected to reach more than 90%). Through physical isolation and directional diversion, the converter 6 and the overflow pipe 5 reconstruct the thermodynamic distribution in the water tank, transforming the passive overflow into active heat exchange, which is the key innovation to improve energy efficiency.

[0041] In some embodiments of the present invention, a tap water inlet pipe is provided at one end of the heat exchange coil 3, and a tap water outlet pipe is provided at the other end. This design not only facilitates the introduction of tap water but also ensures a stable water supply. Tap water continuously flows in through this inlet, providing a continuous and stable water source for the normal operation of the device. At the same time, the tap water inlet pipe is provided on the side wall of the heat recovery water tank 2. Such a layout not only saves space but also facilitates installation and maintenance. At the same time, it avoids direct contact with the waste hot water, ensuring the purity of the tap water. Correspondingly, the tap water outlet pipe, this outlet, is also provided on the side wall of the heat recovery water tank 2. Such a design enables the tap water that has undergone heat exchange in the device to be discharged smoothly and enter the rinsing water tank for subsequent rinsing procedures.

[0042] In some embodiments of the present invention, a slag separation and drainage seat 9 for draining water and separating slag is provided at the bottom of the main washing water tank 1, and a waste water drainage seat is provided at the bottom of the heat recovery water tank 2. The slag separation and drainage seat 9 and the waste water drainage seat are external devices of the main washing water tank 1 and the heat recovery water tank 2 respectively, and the two drainage seats are connected through a connecting pipe 11. When the dishwasher finishes working, it is necessary to drain all the waste hot water in the main washing water tank 1 and the waste hot water in the heat recovery water tank 2. At this time, the vertical drain pipe 8 in the main washing water tank 1 and the vertical overflow pipe in the heat recovery water tank 2 need to be pulled up, and the waste hot water in the main washing water tank 1 will flow through the connecting pipe 11 to the waste water drainage seat at the bottom of the heat recovery water tank 2, and then be discharged to the sewer through the waste hot water outlet 7021 on the waste water drainage seat. When the dishwasher is working, the main washing water tank 1 transports the waste hot water to the heat recovery water tank 2 through the horizontal overflow pipe 4 for heat exchange with the heat exchange coil 3. Since the last step of each dishwashing operation requires washing with clean water, that is, the water in the rinsing arm will enter the main washing water tank 1, which will cause the water level in the main washing water tank 1 to rise until the liquid level exceeds the opening of the horizontal overflow pipe 4 in the main washing water tank 1, and the waste hot water overflows to the heat recovery water tank 2 through the horizontal overflow pipe 4. The water level in the heat recovery water tank 2 also rises accordingly. When the liquid level in the heat recovery water tank 2 exceeds the overflow opening of the vertical overflow pipe, these low-temperature waste hot waters whose waste heat has been absorbed by the heat exchange coil 3 will overflow to the sewer through the overflow opening of the vertical overflow pipe.

[0043] Specifically, during the main washing stage: When the dishwasher is working, the main washing water tank 1 generates waste hot water. The circulation water pump transports the water in the main washing water tank 1 to the main washing spray arm through the circulation water pipe to wash the tableware. The water after washing flows back to the main washing water tank 1 after filtering impurities through the slag separator 903. As the rinsing process progresses, the high-temperature purified water for rinsing from the rinsing water tank flows into the main washing water tank 1 and the water level rises. When the liquid level exceeds the opening of the horizontal overflow pipe 4 in the main washing water tank 1, the waste hot water overflows to the heat recovery water tank 2 through the horizontal overflow pipe 4. Heat recovery stage: In the heat recovery water tank 2, the tap water flowing in the heat exchange coil 3 to the rinsing water tank exchanges heat with the waste hot water outside the coil, and after the water temperature is increased, it flows into the rinsing water tank for use by the rinsing arm. The high-temperature waste hot water in the main washing water tank 1 enters the upper layer of the heat recovery water tank 2 through the horizontal overflow pipe 4 and will naturally float due to its lower density. The presence of the converter 6 blocks its direct discharge from the overflow port at a higher position, and the high-temperature waste hot water is forced to sink, mix with the low-temperature waste hot water in the lower layer, exchange heat, eliminate the vertical temperature difference, and improve the overall heat exchange efficiency. After the cold water in the heat exchange coil 3 absorbs the heat of the waste hot water in the heat recovery water tank 2, the low-temperature waste hot water enters the annular flow channel 603 through the fluid inlet 6021, rises along the narrow channel to the overflow port and is discharged, and is discharged to the sewer through the waste hot water outlet 7021 on the side wall of the second sealing pipe 702 at the lower end of the overflow pipe 5. When the dishwasher finishes working, the vertical drain pipe 8 in the main washing water tank 1 and the overflow pipe 5 in the heat recovery water tank 2 are pulled up. The waste hot water in the main washing water tank 1 flows to the waste hot water drainage seat 7 at the bottom of the heat recovery water tank 2 through the connecting pipe 11 and is then discharged to the sewer through the waste hot water outlet 7021.

[0044] An upper part of a side wall of the main washing water tank 1 is provided with a first opening, a corresponding position of the heat recovery water tank 2 is provided with a second opening, a horizontal overflow water pipe 4 horizontally penetrates and connects the first opening and the second opening, a lower edge height of its water inlet is H1, a lower edge height of an overflow port of the overflow pipe 5 is H2, and H1≥H2; the overflow pipe 5 is a vertically arranged circular pipe, and a distance from its upper overflow port to the top wall of the heat recovery water tank 2 is 1 / 10 to 1 / 5 of the total height of the water tank; the converter 6 includes a conversion pipe 601 and a base 602 connected to the bottom of the conversion pipe 601, both are cylindrical, and a radius of the base 602 is larger than a radius of the conversion pipe 601, and the two are integrally formed. An inner diameter D1 of the conversion pipe 601 is 3 to 5 mm larger than an outer diameter D2 of the overflow pipe 5, forming an annular flow channel 603, and an axial length L of the annular flow channel 603 is L≥55D2; a lower end of the base 602 and a drain port 9021 of the heat recovery water tank 2 and a waste hot water drain base 7 are hermetically connected by interference fit to form a water collection chamber; a fluid inlet 6021 is opened at a lower part of a side surface of the base 602, and the number is 2 to 4. High-temperature waste hot water in the main washing water tank 1 enters the upper layer of the heat recovery water tank 2 through the horizontal overflow water pipe 4 and will naturally float up due to its small density. The presence of the converter 6 blocks its direct overflow, and the high-temperature waste hot water is forced to sink, mixing with the lower-temperature waste hot water at the lower layer, eliminating the vertical temperature difference, and improving the overall heat exchange efficiency. After the cold water in the heat exchange coil 3 absorbs the heat of the water tank, the low-temperature waste hot water enters the annular flow channel 603 through the fluid inlet 6021 and rises along the narrow channel to be discharged from the overflow port. This design ensures that only the low-temperature waste hot water after sufficient heat exchange can be preferentially discharged, avoiding the short-circuit escape of the high-temperature waste hot water.

[0045] During the operation of the dishwasher, the waste hot water in the main washing water tank 1 is first effectively drained into the heat recovery water tank 2 through the horizontal overflow pipe 5. At the same time, the waste hot water is also introduced into the main washing spray arm through the circulating water pipe in the working process of the dishwasher, realizing the recycling of water resources. Specifically, under the push of the circulating water pump, the waste hot water first passes through a slag separation net 903 installed at the upper end of the slag separation and drainage base 9 for fine filtration to ensure the purity of the water quality. Subsequently, the filtered waste hot water flows into the circulating water pipe at the lower end of the slag separation and drainage base 9 and then enters the main washing spray arm. In this process, the main washing spray arm uses this water to wash the tableware again. After the washing is completed, the water passes through the filter net again and enters the main washing water tank 1 to prepare for the next cycle. This cycle process aims to improve the water resource utilization efficiency and ensure the cleanliness of the tableware.

[0046] In some embodiments of the present invention, the fluid inlet 6021 is any one of a plurality of equally spaced water inlet holes, a spiral diversion channel, a grid-like porous structure, a continuous annular opening, a combination form of an intermittent annular opening and a fixed support structure, or a corrugated annular diversion groove structure.

[0047] Specifically, there are multiple equally spaced water inlet holes: circular through-holes with a diameter of 3-8 mm are evenly opened in the circumferential direction of the base 602 to ensure the flow rate, and the hole spacing is 1.5-3 times the aperture to ensure the structural strength, forming uniform water inlet and avoiding local eddy currents; spiral flow guide channels: continuous spiral grooves are machined on the inner wall of the base 602 to generate swirl and enhance the mixing effect; grid-like porous structure: grids are formed by stamping or casting processes to equalize the water flow and intercept large particle impurities at the same time; continuous annular opening: a complete annular gap design with a width of 8-15 mm to ensure sufficient flow area and provide the maximum flow capacity; intermittent annular opening combined structure: the opening sections and the support sections are arranged alternately to achieve flow guiding on the premise of ensuring the structural rigidity; corrugated flow guide grooves: periodic corrugated structures to enhance fluid disturbance and improve the heat exchange efficiency.

[0048] In some embodiments of the present invention, a first limiting member 605 is provided on the outer periphery of the current converter 6, and the first limiting member 605 is used for cooperative installation with the heat recovery water tank 2. The limiting member is used to cooperate with the corresponding structure of the heat recovery water tank 2 or other related components to limit the displacement of the current converter 6 during the installation process, ensure the accuracy of the installation position of the current converter 6, and at the same time enhance the stability of the current converter 6 during the working process to prevent it from shaking or rotating. Specifically, a limiting member is provided on the outer periphery of the current converter 6. The limiting member is a convex structure distributed around the outer periphery of the current conversion tube 601. There is a hole at the bottom of the heat recovery water tank 2, and the first limiting member 605 cooperates with the edge of this hole, and the first limiting member 605 overlaps on the edge of the hole. During installation, the current converter 6 is placed into the heat recovery water tank 2, and the convex part overlaps on the edge of the hole, thereby realizing the limitation of the current converter 6. This limiting method is not only easy to operate, but also can effectively limit the displacement of the current converter 6 in the horizontal and vertical directions, ensuring the normal operation of the heat recovery device. In addition, the limiting member can also be designed in other forms, such as arranging a plurality of spaced limiting blocks on the outer periphery of the current converter 6, which can also achieve the limiting effect.

[0049] In some embodiments of the present invention, the current converter 6 includes a current conversion tube 601 and a base 602 connected to the bottom of the current conversion tube 601. Both the current conversion tube 601 and the base 602 are cylindrical, and the radius of the base 602 is greater than the radius of the current conversion tube 601.

[0050] Specifically, the converter 6 is composed of a cylindrical converter tube 601 and a cylindrical base 602, which are connected by an integral molding process (such as casting or welding) to ensure structural sealing. The radius (R1) of the base 602 is larger than the radius (R2) of the converter tube 601, forming a radially expanding structure. The base 602 is flange-sealed and connected to the waste hot water drain seat 7 of the heat recovery water tank 2 and fixed by bolts. The converter tube 601 (narrow upper cylinder) is sleeved outside the overflow pipe 5 to form an annular flow channel 603, guiding the low-temperature water to rise to the overflow port. The radius of the base 602 (wide lower cylinder) is larger than that of the converter tube 601, and it is sealed and connected to the drain seat of the heat recovery water tank 2. A fluid inlet 6021 is provided on its side as the inlet of the low-temperature water. After the high-temperature waste hot water enters the heat recovery water tank 2 from the main washing water tank 1, it is blocked from flowing directly to the overflow port because it is wrapped outside the converter 6 and is forced to sink downward and mix with the low-temperature zone. The low-temperature water that has completed heat exchange enters through the fluid inlet 6021 of the base 602, rises along the narrow annular flow channel 603 between the converter tube 601 and the overflow pipe 5, and finally discharges from the overflow port. The enlarged design of the base 602 extends the downward path of the high-temperature water, promotes forced convection with the low-temperature water at the bottom of the water tank, and significantly reduces temperature stratification. The combination of the narrow converter tube 601 and the wide base 602 forms a "flare" structure, which not only ensures the smooth rise of the low-temperature water but also avoids the short circuit of the high-temperature water, preferentially discharging the low-temperature water to increase the heat exchange duration. The base 602 is sealed and connected to the water tank drain seat to prevent the leakage of unexchanged hot water, while maintaining the system water balance and pressure stability. The cylindrical structure is compact, and the annular flow channel 603 is designed to achieve efficient flow guidance in a limited space, which is suitable for miniaturized devices such as dishwashers.

[0051] In addition, the main purpose of the wide base 602 is to achieve a sealed connection with the waste water drain seat of the heat recovery water tank 2 (usually the dimensions need to be matched with the drain seat to avoid leakage), rather than directly participating in fluid guidance. The larger radius facilitates the arrangement of multiple fluid inlets 6021 on the side of the base 602, expanding the cross-sectional area of the low-temperature water inlet and reducing the flow resistance. The constant narrow annular flow channel 603 (non-tapering) between the narrow converter tube 601 and the overflow pipe 5 maintains the stability of the rising flow velocity of the low-temperature water by restricting the cross-sectional area of the flow and avoiding turbulent flow.

[0052] In some embodiments of the present invention, the lower half of the base 602 has a cylindrical extension structure 606, and the extension structure 606 is used to extend into the waste hot water drain seat 7 at the bottom of the heat recovery water tank 2 for sealed connection. Specifically, the outer diameter of the lower half of the base 602 is adapted to the inner diameter of the waste hot water drain seat 7 of the heat recovery water tank 2, and the length of the extension part structure is determined according to the depth of the waste hot water drain seat 7 of the heat recovery water tank 2. During installation, the lower half of the base 602 is slowly inserted into the waste hot water drain seat 7, and fixed and limited by the first limiting member 605 on the converter 6.

[0053] In some embodiments of the present invention, the top end of the converter 6 is higher than the overflow port of the overflow pipe 5.

[0054] Specifically, since the top of the converter 6 is higher than the overflow port, the high-temperature waste hot water cannot directly cross over the top of the converter 6 and enter the overflow pipe 5. It must detour downward to the bottom of the converter 6 before it can enter the annular flow channel 603. This structure strengthens the forced downward path of the high-temperature water, enabling it to fully mix with the low-temperature water in the lower layer of the water tank and avoiding thermal short-circuit (the high-temperature water overflows without sufficient heat exchange). The low-temperature water after heat exchange enters the annular flow channel 603 through the fluid inlet 6021 of the base 602 and rises along the channel between the flow conversion pipe 601 and the overflow pipe 5. Since the top of the converter 6 is higher than the overflow port, only the low-temperature water that rises to the height of the overflow port can overflow, ensuring that the discharged low-temperature water has completed heat exchange. The height of the overflow port determines the water level in the water tank, and the design that the top of the converter 6 is higher than the overflow port can prevent accidental overflow of high-temperature water caused by water surface fluctuations and maintain the stability of the system.

[0055] In some embodiments of the present invention, a plurality of reinforcing ribs 604 are provided inside the base 602, and the reinforcing ribs 604 are uniformly distributed in a spiral shape on the inner wall of the base 602. A plurality of reinforcing ribs 604 (usually 4 - 6) are uniformly distributed in a spiral shape on the inner wall of the base 602. The inclination angle (α) of the reinforcing ribs 604 is 30° - 45° (preferably 35°), the height (h) of the reinforcing ribs 604 is 1 / 3 - 1 / 2 of the inner cavity height of the base 602, and the reinforcing ribs 604 and the base 602 are integrally cast. The reinforcing ribs 604 are mainly used to enhance the structural strength of the base 602 and improve the overall stability of the converter 6 to adapt to the water flow pressure and mechanical vibration inside the dishwasher.

[0056] In some embodiments of the present invention, a vertical drain pipe 8 is provided in the main washing water tank 1. The bottom of the main washing water tank 1 is connected to a slag separation and drainage seat 9. The slag separation and drainage seat 9 includes a first water collection tank 901 and a first sealing pipe 902 provided at the bottom of the first water collection tank 901. A drain port 9021 is provided on the side wall of the first sealing pipe 902. The lower end of the vertical drain pipe 8 is inserted into the first sealing pipe 902 to seal the first sealing pipe 902. A circulating water pipe is provided on the side wall of the first water collection tank 901, and the other end of the circulating water pipe is provided with a circulating water pump. When the main washing water tank 1 is working, the circulating water pump transports the water in the main washing water tank 1 through the circulating water pipe to the main washing spray arm for recycling. The slag separation and drainage seat 9 further includes a slag separation net 903, and the slag separation net 903 is connected to the top of the first water collection tank 901. When the main washing water tank 1 is working, the water in the main washing water tank 1 passes through the slag separation net 903, through the first water collection tank 901, and then enters the circulating water pipe under the action of the circulating water pump.

[0057] Specifically, the design of the slag separation and drainage seat 9 includes three main components: a slag separation net 903, a first water collection tank 901, and a first sealing pipe 902, which are tightly connected from top to bottom. A slag separation net 903 is cleverly arranged between the cavity of the main washing water tank 1 and the first water collection tank 901 to ensure that the waste hot water can be effectively filtered when flowing through and then smoothly enter the first water collection tank 901. The cavities of the main washing water tank 1, the first water collection tank 901, and the first sealing pipe 902 are interconnected to form a smooth liquid channel.

[0058] The vertical drain pipe 8 first passes through the slag separation net 903, then passes through the cavity of the first water collection tank 901, and finally accurately inserts into the first sealing pipe 902 to ensure a shape fit with the first sealing pipe 902 and achieve a tight connection through an interference fit. This design aims to prevent water from leaking through the gap between the first sealing pipe 902 and the vertical drain pipe 8 when the dishwasher is working, ensuring that water can only flow out from the drain port 9021 on the side wall of the first sealing pipe 902 to maintain the normal operation of the dishwasher.

[0059] When the dishwasher finishes working, the vertical drain pipe 8 can be easily removed from the first sealing pipe 902. At this time, water can pass through the first water collection tank 901, the first sealing pipe 902 in sequence, and finally drain out from the drain port 9021 on the side wall of the first sealing pipe 902 to achieve a convenient drainage function. When the dishwasher is in the working state, the waste hot water in the first water collection tank 901 only flows out through the circulating water pipe on the side wall of the first water collection tank 901 under the action of the circulating water pump and participates in the water circulation process of the dishwasher. At this time, since the vertical drain pipe 8 has been inserted into the first sealing pipe 902, the first sealing pipe 902 at the bottom of the first water collection tank 901 is effectively blocked, ensuring that water can only flow out from the circulating water pipe according to the designed path to maintain the stable operation of the dishwasher.

[0060] In some embodiments of the present invention, a waste water drainage seat is connected to the bottom of the heat recovery water tank 2. The waste hot water drainage seat 7 includes a second water collection tank 701 and a second sealing pipe 702 provided at the bottom of the second water collection tank 701. A waste hot water inlet 7011 is provided on the side wall of the second water collection tank 701, and a waste hot water outlet 7021 is provided on the side wall of the second sealing pipe 702. The upper end of the vertical overflow pipe is provided with an overflow port, and the lower end is inserted into the second sealing pipe 702 for sealing the second sealing pipe 702. The drain port 9021 on the slag separation and drainage seat 9 is connected to the waste hot water inlet 7011 through a connecting pipe 11.

[0061] Specifically, the vertical overflow pipe is a pipe, usually used to discharge or guide liquids. The overflow opening is an opening on the vertical overflow pipe. When the liquid exceeds its designed capacity, the excess liquid can flow out through the overflow opening. The function of this overflow opening is to monitor the liquid level of the waste hot water. When the liquid level of the waste hot water gradually rises and reaches or even exceeds the height of the overflow opening, the system will automatically start the discharge program. This design effectively avoids the overflow risk caused by the too high liquid level of the waste hot water, thus ensuring the normal operation of the system.

[0062] In addition, the waste hot water drain seat 7 includes two major components, namely the second water collection tank 701 and the second sealing pipe 702, which are closely connected to form a smooth channel. Among them, the cavities of the heat recovery water tank 2, the second water collection tank 701, and the second sealing pipe 702 are all connected to each other in sequence from top to bottom. The vertical overflow pipe is designed such that its upper part is located inside the cavity of the heat recovery water tank 2, while its lower part passes through the cavity of the second water collection tank 701 and finally inserts into the second sealing pipe 702.

[0063] During the normal operation of the dishwasher, the second sealing pipe 702 and the vertical overflow pipe form a tight interference fit to ensure that the vertical overflow pipe effectively seals the second sealing pipe 702, thereby preventing the water in the second water collection tank 701 from flowing out through the tiny gap between the two. At this time, the waste hot water can only be discharged through the overflow opening. Specifically, when the dishwasher is in operation, the excess water will flow into the cavity of the overflow pipe through the overflow opening, then through the pipe orifice of the overflow pipe, and finally be smoothly discharged through the waste hot water outlet 7021 on the side wall of the second sealing pipe 702.

[0064] When the dishwasher finishes working, the vertical overflow pipe will be pulled out from the second sealing pipe 702. At this time, the vertical overflow pipe no longer seals the second sealing pipe 702. At this time, the water will flow through the second water collection tank 701 and the second sealing pipe 702 in sequence and finally be discharged through the waste hot water outlet 7021 on the side wall of the second sealing pipe 702. At the same time, a dedicated connecting pipe 11 is used to connect the drain port 9021 on the first sealing pipe 902 and the waste hot water inlet 7011 on the second water collection tank 701. When the dishwasher finishes working, the vertical drain pipe 8 will be taken out from the first sealing pipe 902, and at the same time, the vertical overflow pipe will also be taken out from the second sealing pipe 702. At this time, the water in the main washing tank 1 will flow through the first water collection tank 901, the first sealing pipe 902, the drain port 9021, the waste hot water inlet 7011, the second water collection tank 701, the second sealing pipe 702 in sequence and finally be discharged from the waste hot water outlet 7021 on the side wall of the second sealing pipe 702.

[0065] In some embodiments of the present invention, a second limiting member 501 is provided on the outer periphery of the overflow pipe 5; the overflow port 502, and the second limiting member 501; the overflow port 502 is used for mating installation with the waste hot water drainage seat 7 at the bottom of the heat recovery water tank 2.

[0066] Specifically, the second limiting member 501; the overflow port 502 is an annular protrusion surrounding the outer periphery of the overflow pipe 5 or a plurality of spaced limiting blocks. A hole is provided at the bottom of the waste hot water drainage seat 7, and the second limiting member 501; the overflow port 502 is lapped on the edge of the hole to prevent the displacement of the overflow pipe 5. Such a design can not only limit the radial displacement of the overflow pipe 5, but also limit its axial displacement to a certain extent, ensuring that the overflow pipe 5 does not shake or shift during operation, thereby maintaining the stability of the annular flow channel 603 between the overflow pipe 5 and the converter 6, and enabling the normal operation of the heat exchange and drainage functions of the heat recovery device.

[0067] When installing the overflow pipe 5, the overflow pipe 5 is slowly inserted into the heat recovery water tank 2. Due to the lap between the annular protrusion and the edge of the hole, the displacement of the overflow pipe 5 in the radial direction is effectively prevented. This enables the overflow pipe 5 to always be in the central position of the heat recovery water tank 2, ensuring the uniformity of the annular flow channel 603 between the overflow pipe 5 and the converter 6, and avoiding local blockage or poor water flow of the annular flow channel 603 caused by the offset of the overflow pipe 5, thereby ensuring the efficient and stable operation of the heat recovery device.

[0068] In some embodiments of the present invention, the height of the horizontal overflow pipe 4 is greater than or equal to the height of the overflow port.

[0069] Specifically, a first opening is provided on one side wall of the main washing water tank 1, and a second opening is provided at the corresponding position of the heat recovery water tank 2. These two openings are correspondingly arranged and located on the same horizontal plane, aiming to ensure that the liquid can accurately overflow from the main washing water tank 1 to the heat recovery water tank 2 through the horizontal overflow pipe 4. The positions of these two openings are both set at a position higher than or the same as the overflow port, so as to ensure that the highest liquid level in the heat recovery water tank 2 does not exceed the opening, and prevent the liquid in the heat recovery water tank 2 from flowing back into the main washing water tank 1. The floating oil impurities on the liquid surface in the main washing water tank 1 directly enter the heat recovery water tank 2 and flow out, avoiding these floating oil impurities from participating in the water circulation of the main washing water tank 1. This way makes the circulating water in the main washing water tank 1 cleaner, is beneficial to the recycling of water in the main washing water tank 1, and improves the washing effect and the practicality of the equipment.

[0070] In some embodiments of the present invention, the position of the waste hot water outlet 7021 is lower than the position of the waste hot water inlet 7011.

[0071] Specifically, the position of the waste hot water outlet 7021 being lower than the position of the waste hot water inlet 7011 can ensure that the waste hot water can flow out of the collection water tank smoothly and avoid water accumulation.

[0072] In some embodiments of the present invention, the openings at the tops of the main washing water tank 1 and the heat recovery water tank 2 are both connected to the bottom wall of the dishwasher sink 10. A filter screen is provided at the top of the opening of the main washing water tank 1. The water in the dishwasher sink 10 enters the main washing water tank 1 through the filter screen, and the opening of the heat recovery water tank 2 is in a sealed state.

[0073] Specifically, the openings at the tops of the main washing water tank 1 and the heat recovery water tank are both connected to the bottom wall of the dishwasher sink 10. This allows the water in the dishwasher sink 10 to directly enter the main washing water tank 1 through the filter screen, reducing intermediate links and improving work efficiency. A filter screen is provided at the top of the opening of the main washing water tank 1, which can filter out impurities in the water and ensure the quality of the water entering the main washing water tank 1. The opening of the heat recovery water tank 2 is in a sealed state, which can prevent the water in the dishwasher sink 10 from entering the heat recovery water tank 2 through the opening at the top of the heat recovery water tank 2, and also prevent the heat in the heat recovery water tank 2 from dissipating, improving the heat exchange efficiency.

[0074] In some embodiments of the present invention, the opening of the heat recovery water tank 2 is provided with a cover body for sealing the opening.

[0075] Specifically, this facilitates the cleaning of the heat recovery water tank 2 by the staff and the removal of the heat exchange coil 3 for cleaning. At the same time, the cover body can also prevent the water in the dishwasher sink 10 from entering the heat recovery water tank 2 through the opening at the top of the heat recovery water tank 2, affecting the normal operation of the heat recovery water tank 2.

[0076] In some embodiments of the present invention, the top end of the vertical drain pipe 8 is higher than the horizontal overflow pipe 4.

[0077] Specifically, for the convenience of the staff to more easily remove the vertical drain pipe 8, an appropriate height setting is adopted in this design. In this layout, the liquid level in the main washing water tank 1 always remains below the height of the horizontal overflow pipe 4, so that the top end of the vertical drain pipe 8 is higher than the liquid level in the main washing water tank 1. This not only facilitates the staff's handling operation but also effectively prevents the staff from being scalded by contacting high-temperature liquid during the operation and avoids the contamination of the arm by the liquid.

[0078] The design of the converter 6 of the present invention enables the upper-layer high-temperature waste hot water in the heat recovery water tank 2 to enter the annular flow channel 603 of the converter 6 and the overflow pipe 5 through the top opening of the converter 6, then descend to the water collection chamber, and finally flow out from the fluid inlet 6021 on the side of the base 602, mixing with the waste hot water at the bottom of the heat recovery water tank 2, uniformly raising the water temperature in the heat recovery water tank 2 and enhancing the heat exchange effect of the heat exchange coil 3.

[0079] The above are only the principles and preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, based on the principles of the present invention, several other variations can also be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A heat recovery inverter for use with an overflow pipe of a dishwasher, characterized in that: The inverter is sleeved outside the overflow pipe and forms an axially continuous annular flow channel between the inverter and the overflow pipe. The top of the inverter is open and its top is higher than the overflow port at the upper part of the overflow pipe. The lower part of the inverter is provided with at least one fluid inlet, and the fluid inlet is used to guide low-temperature waste hot water into the inverter and rise along the annular flow channel to the overflow port of the overflow pipe for discharge.

2. A heat recovery inverter according to claim 1, characterized in that: The fluid inlet is any one of a plurality of equally spaced water inlet holes, a spiral guide channel, a grid-like porous structure, a continuous annular opening, a combination of an intermittent annular opening and a fixed support structure, or a corrugated annular guide groove structure.

3. The heat recovery inverter according to claim 1, characterized in that: A first stopper is provided on the outer periphery of the inverter, and the first stopper is used for installation in cooperation with the heat recovery water tank.

4. The heat recovery inverter according to claim 1, characterized in that: The converter comprises a converter tube and the base connected to the bottom of the converter tube. Both the converter tube and the base are cylindrical, and the radius of the base is greater than the radius of the converter tube.

5. A heat recovery inverter according to claim 4, characterized in that: The lower half of the base is a cylindrical extension structure, and the extension structure is used to extend into the waste hot water drain seat at the bottom of the heat recovery water tank for sealing connection.

6. A heat recovery inverter according to claim 4, characterized in that: A plurality of reinforcing ribs are arranged in the base, and the reinforcing ribs are evenly distributed on the inner wall of the base in a spiral shape.

7. A heat recovery device, characterized in that: It comprises an overflow pipe and the converter according to any one of claims 1 to 6, wherein an overflow port is provided at the upper portion of the overflow pipe, and the interior of the overflow pipe is a hollow flow guide channel; the converter is coaxially sleeved outside the overflow pipe and forms an axially continuous annular flow channel between the converter and the overflow pipe; the top end of the converter extends to a position higher than the overflow port.

8. The heat recovery device according to claim 7, characterized in that: The inverter and the overflow pipe are an integrally formed structure or a detachable connection structure.

9. The heat recovery device according to claim 7, characterized in that: A second stopper is disposed on the outer periphery of the overflow pipe, and the second stopper is used to be installed in cooperation with the waste hot water drain seat at the bottom of the heat recovery water tank.

10. A dishwasher with a heat recovery device, characterized in that: include: Main wash water tank and heat recovery tank; The heat recovery device according to claim 7, wherein the heat recovery device is arranged in the heat recovery water tank; A heat exchange coil, disposed in the heat recovery water tank, for exchanging heat with the waste hot water; a horizontal overflow pipe, connected to the main wash water tank and the heat recovery water tank, and used for overflowing the waste hot water from the main wash water tank to the heat recovery water tank; The heat recovery device is used to guide the low-temperature waste hot water to enter from the bottom of the inverter, and to rise along the annular flow channel to the overflow port for discharge.

11. The dishwasher with a heat recovery device according to claim 10, characterized in that: A slag drain seat is provided at the bottom of the main wash water tank, and the slag drain seat includes a slag net and a first water collecting tank, which is used to filter and collect waste hot water; a waste hot water drain seat is provided at the bottom of the heat recovery water tank, which is used to discharge waste hot water.

12. The dishwasher according to claim 11, characterized in that The slag separation drain seat is connected with the waste hot water drain seat through a connecting pipe, and is used to discharge the waste hot water when the dishwasher finishes working.

13. The dishwasher according to claim 10, characterized in that The height of the horizontal overflow pipe is greater than or equal to the height of the overflow port.

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