Hot water heat recovery energy-saving device for dish washing machine

Abstract

The invention relates to the field of heat recovery devices for dishwashers, and discloses a hot water heat recovery energy-saving device for a dishwasher, which comprises a bottom plate, the bottom plate is arranged on one side of the dishwasher, a shell is fixedly mounted on the bottom plate, an electric box is fixedly mounted at the top of the shell, and a wastewater inlet pipe and a purified water outlet pipe are arranged in the bottom plate; the front and back pressure difference of the filtering assembly is detected in real time through the pressure difference sensor, and when the filtering assembly is blocked and the waste water flow is reduced, on one hand, the first three-way valve is triggered to open the water supplementing pipe, and high-temperature purified water in the purified water outlet pipe is supplemented to the water conveying pipe; on the other hand, the one-way valve is matched to prevent reverse backflow of fluid, it is ensured that make-up water completely enters the evaporator, sufficient heat is provided for a liquid working medium to enable the liquid working medium to be completely evaporated, and the problem that the working medium with liquid enters a compressor due to the fact that the waste water flow is too small and the temperature is too low is solved.

Description

Technical Field

[0001] This invention relates to the field of heat recovery devices for dishwashers, and more specifically to an energy-saving device for hot water heat recovery in dishwashers. Background Technology

[0002] Generally speaking, a dishwasher hot water heat recovery energy-saving device is an energy-saving device used to recover the waste heat of high-temperature wastewater discharged by the dishwasher and prepare high-temperature hot water. In the operation of the dishwasher's circulating water, it is necessary to achieve efficient absorption of waste heat from high-temperature wastewater, use heat pump working fluid as heat carrier to complete the heat grade improvement, and then transfer the high-grade heat to the purified water to prepare high-temperature hot water that meets the needs of the dishwasher. This reduces the energy consumption of the dishwasher in heating purified water and also reduces the heat waste caused by the direct discharge of high-temperature wastewater.

[0003] In practice, the high-temperature wastewater discharged by dishwashers often carries food residue, grease flocculents, and other impurities. These impurities can easily clog the front-end filter, resulting in insufficient wastewater flow and a drop in temperature into the evaporator. At this time, the low-temperature, low-pressure liquid working fluid in the evaporator cannot fully absorb the waste heat and is difficult to completely vaporize into a gaseous state. The unvaporized liquid working fluid will mix with the gaseous working fluid and enter the compressor together. However, the compressor only works with gaseous working fluid, and liquid working fluid is almost incompressible. After entering the compression chamber, it will impact the tooth surface of the scroll plate and the bearing, causing wear and deformation of the components. This will not only damage the equipment but also cause the waste heat recovery system to shut down, making it impossible to continuously supply high-temperature hot water to the dishwasher. Based on this, the present invention purposefully provides an energy-saving device for hot water heat recovery in dishwashers that can ensure a stable supply of waste heat from the evaporator, prevent liquid working fluid from entering the compressor, and avoid liquid slugging. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an energy-saving device for hot water heat recovery in dishwashers, thereby solving the technical problems in the prior art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] An energy-saving device for hot water heat recovery in a dishwasher includes:

[0007] A base plate is located on one side of the dishwasher. A housing is fixedly mounted on the base plate, and an electrical box is fixedly mounted on the top of the housing. A wastewater inlet pipe and a clean water outlet pipe are installed inside the base plate. The wastewater inlet pipe is connected to the dishwasher's outlet, and the clean water outlet pipe is connected to the dishwasher's inlet. An evaporator, compressor, condenser, and expansion valve are fixedly mounted on the base plate. The condenser has a cold medium flow channel and a hot medium flow channel. A clean water inlet pipe and a clean water outlet pipe are connected to the condenser. The clean water inlet pipe is connected to the clean water outlet pipe through the cold medium flow channel. The purified water outlet pipe is connected to the dishwasher inlet, and the purified water inlet pipe is connected to the external water supply assembly. The evaporator is provided with a working fluid channel and a wastewater channel. The outlet of the working fluid channel of the evaporator is connected to the working fluid channel inlet of the evaporator in sequence through a first gas supply pipe, a compressor, a second gas supply pipe, a condenser heat medium channel, a first return pipe, a throttle valve, and a second return pipe. The throttle valve is used to reduce the pressure of the high-pressure gaseous working fluid in the first return pipe. The outlet of the wastewater inlet pipe is connected in sequence to a filter assembly, a water supply pipe, the wastewater channel of the evaporator, and a drain pipe.

[0008] A water replenishment component is disposed inside the housing. The water replenishment component is connected to the purified water outlet pipe and the water supply pipe. When the filter component is blocked, the water replenishment component delivers a portion of the high-temperature purified water in the purified water outlet pipe to the water supply pipe.

[0009] As a further embodiment of the present invention: the water replenishment component includes a first three-way valve and a water replenishment pipe, the purified water outlet pipe is connected to the dishwasher water inlet through the first three-way valve, the water replenishment pipe is connected to the first three-way valve, and the other end of the water replenishment pipe is connected to the water supply pipe.

[0010] As a further aspect of the present invention: a one-way valve is fixedly installed on the water supply pipe, and the one-way valve is located between the connection between the water supply pipe and the water supply pipe and the connection between the water supply pipe and the filter cylinder.

[0011] As a further embodiment of the present invention: the filtration assembly includes a filter cylinder, a filter screen and a differential pressure sensor. The filter cylinder is fixedly installed on the base plate, the filter screen is fixedly installed inside the filter cylinder, the wastewater inlet pipe is connected to the bottom of the filter cylinder, the water supply pipe is connected to the top of the filter cylinder, and the two differential pressure sensors are respectively fixedly installed on the wastewater inlet pipe and the water supply pipe.

[0012] As a further embodiment of the present invention: the filtration assembly further includes a second three-way valve and a third three-way valve, the number of filter cylinders is two, the wastewater inlet pipe is connected to the bottom of the two filter cylinders through the second three-way valve, the water supply pipe is connected to the top of the two filter cylinders through the third three-way valve, each filter cylinder is provided with a cleaning assembly, and the differential pressure sensor is connected to the cleaning assembly.

[0013] As a further aspect of the present invention: each of the cleaning components includes a backwash water pipe and a waste discharge pipe, the backwash water pipe being connected to the top of the filter cylinder, the waste discharge pipe being connected to the bottom of the filter cylinder, and the backwash water pipe penetrating the outer shell and being connected to an external high-pressure flushing component.

[0014] As a further aspect of the present invention: the base plate is provided with a plurality of circular holes, and the waste discharge pipe and the drain pipe are both located above one of the circular holes.

[0015] As a further aspect of the present invention: a heat dissipation component is fixedly installed on the top of the outer casing, and the heat dissipation component is used to dissipate heat from the electrical box and the interior of the outer casing.

[0016] The beneficial effects of this invention are:

[0017] 1. In this invention, the pressure difference before and after the filter component is detected in real time by a differential pressure sensor. When the filter component is blocked and the wastewater flow rate decreases, on the one hand, the first three-way valve is triggered to open the water supply pipe, and the high-temperature clean water in the clean water outlet pipe is supplied to the water supply pipe to maintain the flow rate and temperature of the evaporator wastewater channel. On the other hand, the one-way valve is used to prevent the fluid from flowing back in reverse, ensuring that all the supplemented water enters the evaporator, providing sufficient heat for the liquid working fluid to evaporate completely, and avoiding the problem of the working fluid entering the compressor due to the wastewater flow rate being too small and the temperature being too low.

[0018] 2. In this invention, the filter assembly adopts a dual filter cartridge with a switching structure of a second three-way valve and a third three-way valve. When one of the filter cartridges is blocked, the differential pressure sensor synchronously controls the three-way valve to switch to the standby filter cartridge, ensuring that wastewater filtration and transportation are uninterrupted. At the same time, the backwash cleaning assembly for the blocked filter cartridge is started. High-pressure water is injected through the backwash water pipe to flush the filter screen impurities and discharge them through the waste discharge pipe. After cleaning, the filter cartridge returns to standby status, avoiding the problem of waste heat recovery interruption caused by the need to stop the single filter cartridge system for cleaning. This enables the filter assembly to work continuously and improves the waste heat recovery efficiency of the system.

[0019] 3. In this invention, the heat dissipation component on the top of the outer shell continuously dissipates heat to the electrical box and the interior of the outer shell, preventing the temperature inside the shell from becoming too high due to the heat generated by the compressor and the heat generated by the electrical components in the electrical box. At the same time, the round hole on the bottom plate guides the wastewater from the waste discharge pipe and the drain pipe to be discharged in a concentrated manner, preventing the wastewater from accumulating and damaging the electrical components. This ensures that all components of the device are in a normal working environment for a long time, extends the service life of the equipment, and ensures the stable operation of the heat pump cycle to continuously achieve energy-saving effects. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2This is a schematic diagram of the structure on the base plate in this invention;

[0023] Figure 3 In this invention Figure 2 A schematic diagram of the structure from head-up view;

[0024] Figure 4 This is a cross-sectional structural schematic diagram of the filter cartridge in this invention.

[0025] In the diagram: 1. Base plate; 2. Outer shell; 3. Heat dissipation assembly; 4. Electrical box; 5. Evaporator; 6. Compressor; 7. Condenser; 8. Throttling valve; 9. First gas supply pipe; 10. Second gas supply pipe; 11. First return pipe; 12. Second return pipe; 13. Clean water inlet pipe; 14. Clean water outlet pipe; 15. Filter cartridge; 16. Filter screen; 17. Wastewater inlet pipe; 18. Water supply pipe; 19. Drain pipe; 20. Differential pressure sensor; 21. First three-way valve; 22. Water supply pipe; 23. Second three-way valve; 24. Third three-way valve; 25. Backflush pipe; 26. Waste discharge pipe; 27. Round hole; 28. Check valve. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1-4 As shown, the present invention is an energy-saving device for hot water heat recovery in a dishwasher, comprising:

[0028] A base plate 1 is disposed on one side of the dishwasher. A housing 2 is fixedly installed on the base plate 1, and an electrical box 4 is fixedly installed on the top of the housing 2. A wastewater inlet pipe 17 and a clean water outlet pipe 14 are disposed inside the base plate 1. The wastewater inlet pipe 17 is connected to the dishwasher's water outlet, and the clean water outlet pipe 14 is connected to the dishwasher's water inlet. An evaporator 5, a compressor 6, a condenser 7, and a throttle valve 8 are fixedly installed on the base plate 1. A cold medium flow channel and a hot medium flow channel are disposed inside the condenser 7. A clean water inlet pipe 13 and a clean water outlet pipe 14 are connected to the condenser 7. The clean water inlet pipe 13 is connected to the clean water outlet pipe 14 through the cold medium flow channel. The purified water outlet pipe 14 is connected to the dishwasher water inlet, and the purified water inlet pipe 13 is connected to the external water supply component. The evaporator 5 is provided with a working fluid flow channel and a wastewater flow channel. The outlet of the working fluid flow channel of the evaporator 5 is connected to the working fluid flow channel inlet of the evaporator 5 in sequence through the first gas supply pipe 9, the compressor 6, the second gas supply pipe 10, the heat medium flow channel of the condenser 7, the first return pipe 11, the throttle valve 8, and the second return pipe 12. The throttle valve 8 is used to reduce the pressure of the high-pressure gaseous working fluid in the first return pipe 11. The outlet of the wastewater inlet pipe 17 is connected in sequence to the filter component, the water supply pipe 18, the wastewater flow channel of the evaporator 5, and the drain pipe 19.

[0029] A water replenishment component is disposed inside the outer casing 2. The water replenishment component is connected to the purified water outlet pipe 14 and the water supply pipe 18. When the filter component is blocked, the water replenishment component delivers a portion of the high-temperature purified water in the purified water outlet pipe 14 to the water supply pipe 18.

[0030] The working principle of this invention is as follows: First, the high-temperature wastewater discharged from the dishwasher enters the filter assembly through the wastewater inlet pipe 17. After impurities are removed by the filter assembly, it is transported to the wastewater channel of the evaporator 5 through the water supply pipe 18. The high-temperature wastewater exchanges heat with the low-temperature, low-pressure liquid working fluid in the working fluid channel within the evaporator 5. After releasing heat, the wastewater is discharged through the drain pipe 19. Simultaneously, the liquid working fluid in the evaporator 5 absorbs heat from the wastewater and vaporizes into a gaseous working fluid. The gaseous working fluid enters the compressor 6 through the first gas supply pipe 9. After being compressed by the compressor 6, it becomes a high-temperature, high-pressure gaseous working fluid. The high-temperature, high-pressure gaseous working fluid then passes through the second gas supply pipe 9. Gas pipe 10 enters the heat medium flow channel of condenser 7; cold water supplied by external water supply component enters the cold medium flow channel of condenser 7 through purified water inlet pipe 13, and exchanges heat with the high temperature and high pressure gaseous working fluid in the heat medium flow channel. After being heated into high temperature purified water, the cold water is delivered to dishwasher through purified water outlet pipe 14. The gaseous working fluid in the heat medium flow channel of condenser 7 releases heat and condenses into liquid working fluid. The liquid working fluid enters the throttling valve 8 through the first return pipe 11. After being depressurized by the throttling valve 8, it becomes a low temperature and low pressure liquid working fluid, and then returns to the working fluid flow channel of evaporator 5 through the second return pipe 12, completing one heat pump cycle.

[0031] When the filter assembly becomes clogged, the water replenishment assembly is activated, delivering a portion of the high-temperature purified water from the purified water outlet pipe 14 to the water supply pipe 18. This replenishes the fluid flow in the water supply pipe 18, ensuring a stable total fluid volume and temperature entering the wastewater channel of the evaporator 5. This prevents the liquid working fluid in the evaporator 5 from failing to evaporate completely due to insufficient wastewater flow or low temperature, thereby preventing unvaporized liquid working fluid from entering the compressor 6 and causing liquid slugging.

[0032] It should be noted that: Evaporator 5 is the core component for realizing the waste heat recovery of high-temperature wastewater from the dishwasher. It has parallel working fluid channels and wastewater channels inside. The high-temperature wastewater discharged from the dishwasher at 60 to 80 degrees Celsius enters the wastewater channel of evaporator 5 through wastewater inlet pipe 17, filter components, and water supply pipe 18. At the same time, the low-temperature, low-pressure liquid working fluid, after being depressurized by throttling valve 8, enters the working fluid channel of evaporator 5. Since the wastewater temperature is higher than the liquid working fluid temperature, heat is transferred from the wastewater to the liquid working fluid through the heat exchange tube wall of evaporator 5. After absorbing heat, the liquid working fluid reaches its boiling point and gradually vaporizes into gaseous working fluid. In this process, the phase change of the working fluid is the result of heat absorption, and the purpose is to allow the working fluid to carry the waste heat into the next cycle. The wastewater, as a heat source, drops to 40 to 50 degrees Celsius after the heat is transferred and is discharged through drain pipe 19 and round hole 27 of bottom plate 1, and does not participate in the subsequent heat pump cycle.

[0033] The condenser 7 is the core component for achieving high-grade heat transfer and producing high-temperature purified water. Internally, it has parallel hot and cold medium channels. The gaseous working fluid flowing from the working fluid channel of the evaporator 5 enters the compressor 6 via the first gas supply pipe 9. The compressor 6 consumes electrical energy to compress the gaseous working fluid, causing its temperature to soar to 100-110 degrees Celsius and its pressure to increase significantly, forming a high-temperature, high-pressure gaseous working fluid. This gaseous working fluid enters the hot medium channel of the condenser 7 via the second gas supply pipe 10. Simultaneously, cold water supplied by the external water supply assembly enters the cold medium channel of the condenser 7 via the purified water inlet pipe 13. Due to the gaseous nature of the working fluid... The working fluid temperature is much higher than the cold water temperature. Heat is transferred from the gaseous working fluid to the cold water through the heat exchange tube wall of the condenser 7. After absorbing heat, the cold water temperature rises to 70 to 90 degrees Celsius and is delivered to the dishwasher through the purified water outlet pipe 14. The gaseous working fluid releases heat and cannot maintain its gaseous state, so it condenses into a liquid working fluid. In this process, the phase change of the working fluid is an exothermic result. The purpose is to transfer the upgraded high-grade heat to the purified water. The purified water, as the heat receiver, does not participate in the subsequent heat pump cycle after meeting the water demand of the dishwasher. The condensed liquid working fluid enters the throttling valve 8 through the first return pipe 11 to start the next cycle.

[0034] like Figures 1-3As shown, in a preferred embodiment of the present invention, the water replenishment component includes a first three-way valve 21 and a water replenishment pipe 22. The purified water outlet pipe 14 is connected to the dishwasher water inlet through the first three-way valve 21, the water replenishment pipe 22 is connected to the first three-way valve 21, and the other end of the water replenishment pipe 22 is connected to the water supply pipe 18.

[0035] In one embodiment, when the filter assembly is unobstructed, the water supply pipe 22 is closed; when the filter assembly is clogged, the water supply pipe 22 is opened.

[0036] In practical application, when the filter assembly is unobstructed, the wastewater in the wastewater inlet pipe 17 can stably enter the evaporator 5 through the water supply pipe 18 after filtration. At this time, the first three-way valve 21 controls the water supply pipe 22 to close, and all the high-temperature purified water in the purified water outlet pipe 14 is delivered to the dishwasher. When the filter assembly is blocked, the flow rate in the water supply pipe 18 decreases, and the first three-way valve 21 switches to open the water supply pipe 22. Some of the high-temperature purified water in the purified water outlet pipe 14 flows into the water supply pipe 18 through the water supply pipe 22, mixes with the filtered wastewater, and enters the evaporator 5 to replenish the flow rate and heat in the water supply pipe 18, maintain the heat exchange stability in the evaporator 5, and avoid incomplete evaporation of the liquid working fluid.

[0037] like Figures 1-3 As shown, in a preferred embodiment of the present invention, a one-way valve 28 is fixedly installed on the water supply pipe 18. The one-way valve 28 is located between the connection between the water supply pipe 22 and the water supply pipe 18 and the connection between the water supply pipe 18 and the filter cylinder 15.

[0038] In practical application, when the water supply pipe 22 delivers high-temperature purified water to the water supply pipe 18, the one-way valve 28 only allows the fluid to flow from the side of the water supply pipe 22 and the filter cartridge 15 to the side of the evaporator 5. This prevents the fluid in the water supply pipe 18 from flowing back to the filter cartridge 15, thus avoiding filtered impurities from being flushed back to the wastewater inlet pipe 17 or clogging the water supply pipe 22. At the same time, it ensures that all the replenished high-temperature purified water can enter the evaporator 5, ensuring the heat exchange effect and further reducing the risk of liquid working fluid entering the compressor 6.

[0039] like Figures 1-3 As shown, in a preferred embodiment of the present invention, the filtration assembly includes a filter cylinder 15, a filter screen 16, and a differential pressure sensor 20. The filter cylinder 15 is fixedly installed on the base plate 1, the filter screen 16 is fixedly installed inside the filter cylinder 15, the wastewater inlet pipe 17 is connected to the bottom of the filter cylinder 15, the water supply pipe 18 is connected to the top of the filter cylinder 15, and the two differential pressure sensors 20 are respectively fixedly installed on the wastewater inlet pipe 17 and the water supply pipe 18.

[0040] In one embodiment, the differential pressure sensor 20 is connected to the first three-way valve 21.

[0041] In practical application, the wastewater discharged from the dishwasher enters the bottom of the filter cylinder 15 through the wastewater inlet pipe 17, and after being filtered by the filter screen 16 to remove impurities, it flows from the top of the filter cylinder 15 into the water supply pipe 18. The differential pressure sensor 20 detects the pressure difference between the wastewater inlet pipe 17 and the water supply pipe 18 in real time. When the filter screen 16 is blocked, the resistance inside the filter cylinder 15 increases, and the pressure difference between the two exceeds the set threshold, the differential pressure sensor 20 sends a signal to the first three-way valve 21 to control the first three-way valve 21 to open the water supply pipe 22, so as to replenish the flow in time and avoid a sudden drop in wastewater flow due to the blockage of the filter screen 16. This ensures that the working fluid in the evaporator 5 can fully absorb heat and evaporate, and prevents liquid hammer.

[0042] like Figures 1-3 As shown, in a preferred embodiment of the present invention, the filter assembly further includes a second three-way valve 23 and a third three-way valve 24. There are two filter cylinders 15. The wastewater inlet pipe 17 is connected to the bottom of the two filter cylinders 15 through the second three-way valve 23. The water supply pipe 18 is connected to the top of the two filter cylinders 15 through the third three-way valve 24. Each filter cylinder 15 is provided with a cleaning assembly. The differential pressure sensor 20 is connected to the cleaning assembly.

[0043] In practical application, during normal operation, the second three-way valve 23 and the third three-way valve 24 control one of the filter cartridges 15 to be connected to the pipeline. Wastewater enters the water supply pipe 18 after being filtered by the filter cartridge 15. When the filter screen 16 of the filter cartridge 15 becomes clogged, the differential pressure sensor 20 detects that the pressure difference exceeds the standard. On the one hand, it sends a signal to the first three-way valve 21 to open the water supply pipe 22 for temporary replenishment. On the other hand, it controls the second three-way valve 23 and the third three-way valve 24 to switch, cutting off the clogged filter cartridge 15 from the pipeline. At the same time, another spare filter cartridge 15 is connected to the pipeline to ensure that wastewater filtration and transportation are not interrupted. Subsequently, the differential pressure sensor 20 sends a signal to the cleaning assembly of the clogged filter cartridge 15 to start the cleaning process. After the cleaning is completed, the filter cartridge 15 is used as a spare to realize the continuous operation of the filtration assembly and avoid system shutdown or insufficient flow due to the clogging of a single filter cartridge 15.

[0044] like Figures 1-3 As shown, in a preferred embodiment of the present invention, each of the cleaning components includes a backwash water pipe 25 and a waste discharge pipe 26. The backwash water pipe 25 is connected to the top of the filter cylinder 15, and the waste discharge pipe 26 is connected to the bottom of the filter cylinder 15. The backwash water pipe 25 penetrates the outer shell 2 and is connected to the external high-pressure flushing component.

[0045] In practical application, when a filter cartridge 15 is determined to be clogged and the pipeline is cut off, the external high-pressure flushing component injects high-pressure water into the top of the filter cartridge 15 through the backwash water pipe 25. The high-pressure water flows down from the top of the filter cartridge 15 to flush the filter screen 16, washing away the impurities trapped on the filter screen 16 to the bottom of the filter cartridge 15. Subsequently, the impurities are discharged through the waste discharge pipe 26. During the cleaning process, the pressure and duration of the backwash water flow can be adjusted according to the degree of clogging detected by the differential pressure sensor 20 to ensure that the filter screen 16 is thoroughly cleaned. After cleaning, the filter cartridge 15 is restored to the standby state, ensuring the long-term stable operation of the filter component, reducing flow problems caused by the clogging of the filter screen 16, and indirectly avoiding the risk of liquid hammer.

[0046] like Figures 1-3 As shown, in a preferred embodiment of the present invention, the base plate 1 has a plurality of circular holes 27, and the waste discharge pipe 26 and the drain pipe 19 are both located above one of the circular holes 27.

[0047] In practical application, the cleaning wastewater and impurities discharged from the waste pipe 26, as well as the low-temperature wastewater discharged from the drain pipe 19 after heat exchange in the evaporator 5, are all discharged downward through the corresponding round holes 27 on the bottom plate 1 to prevent wastewater from accumulating on the bottom plate 1.

[0048] like Figures 1-3 As shown, in a preferred embodiment of the present invention, a heat dissipation component 3 is fixedly installed on the top of the outer casing 2, and the heat dissipation component 3 is used to dissipate heat from the electrical box 4 and the interior of the outer casing 2.

[0049] In practical application, during the operation of the device, the compressor 6 generates heat, and the electrical components inside the electrical box 4 also generate heat, causing the temperature inside the outer casing 2 to rise. After the heat dissipation component 3 is activated, it exhausts the hot air inside the outer casing 2 through structures such as fans or heat sinks, while cooling the electrical box 4, ensuring that the temperature inside the outer casing 2 is maintained within the normal operating range of the equipment.

[0050] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. An energy-saving device for hot water heat recovery in a dishwasher, characterized in that, include: A base plate (1) is located on one side of the dishwasher. A housing (2) is fixedly installed on the base plate (1). An electrical box (4) is fixedly installed on the top of the housing (2). A wastewater inlet pipe (17) and a clean water outlet pipe (14) are provided inside the base plate (1). The wastewater inlet pipe (17) is connected to the dishwasher outlet, and the clean water outlet pipe (14) is connected to the dishwasher inlet. An evaporator (5), a compressor (6), a condenser (7), and a throttle valve (8) are fixedly installed on the base plate (1). A cold medium flow channel and a hot medium flow channel are provided inside the condenser (7). A clean water inlet pipe (13) and a clean water outlet pipe (14) are connected to the condenser (7). The clean water inlet pipe (13) is connected to the clean water outlet pipe (8) through the cold medium flow channel. 14) Connected, the purified water outlet pipe (14) is connected to the dishwasher water inlet, the purified water inlet pipe (13) is connected to the external water supply component, the evaporator (5) is provided with a working fluid flow channel and a wastewater flow channel, the outlet of the working fluid flow channel of the evaporator (5) is connected to the working fluid flow channel inlet of the evaporator (5) in sequence through the first gas supply pipe (9), the compressor (6), the second gas supply pipe (10), the heat medium flow channel of the condenser (7), the first return pipe (11), the throttle valve (8) and the second return pipe (12), the throttle valve (8) is used to reduce the pressure of the high-pressure gaseous working fluid in the first return pipe (11), the outlet of the wastewater inlet pipe (17) is connected to the filter component, the water supply pipe (18), the wastewater flow channel of the evaporator (5) and the drain pipe (19) in sequence. The water replenishment component is located inside the outer shell (2). The water replenishment component is connected to the purified water outlet pipe (14) and the water supply pipe (18). When the filter component is blocked, the water replenishment component will transport part of the high-temperature purified water in the purified water outlet pipe (14) to the water supply pipe (18).

2. The energy-saving device for hot water heat recovery in a dishwasher according to claim 1, characterized in that, The water replenishment component includes a first three-way valve (21) and a water replenishment pipe (22). The purified water outlet pipe (14) is connected to the dishwasher water inlet through the first three-way valve (21). The water replenishment pipe (22) is connected to the first three-way valve (21). The other end of the water replenishment pipe (22) is connected to the water supply pipe (18).

3. The energy-saving device for hot water heat recovery in a dishwasher according to claim 1, characterized in that, A one-way valve (28) is fixedly installed on the water supply pipe (18). The one-way valve (28) is located between the connection between the water supply pipe (22) and the water supply pipe (18) and the connection between the water supply pipe (18) and the filter cylinder (15).

4. The energy-saving device for hot water heat recovery in a dishwasher according to claim 1, characterized in that, The filter assembly includes a filter cylinder (15), a filter screen (16), and a differential pressure sensor (20). The filter cylinder (15) is fixedly installed on the base plate (1), the filter screen (16) is fixedly installed inside the filter cylinder (15), the wastewater inlet pipe (17) is connected to the bottom of the filter cylinder (15), the water supply pipe (18) is connected to the top of the filter cylinder (15), and the two differential pressure sensors (20) are fixedly installed on the wastewater inlet pipe (17) and the water supply pipe (18), respectively.

5. The energy-saving device for hot water heat recovery in a dishwasher according to claim 4, characterized in that, The filter assembly also includes a second three-way valve (23) and a third three-way valve (24). There are two filter cylinders (15). The wastewater inlet pipe (17) is connected to the bottom of the two filter cylinders (15) through the second three-way valve (23). The water supply pipe (18) is connected to the top of the two filter cylinders (15) through the third three-way valve (24). Each filter cylinder (15) is equipped with a cleaning assembly. The differential pressure sensor (20) is connected to the cleaning assembly.

6. The energy-saving device for hot water heat recovery in a dishwasher according to claim 5, characterized in that, Each of the cleaning components includes a backwash pipe (25) and a waste pipe (26), the backwash pipe (25) being connected to the top of the filter cartridge (15) and the waste pipe (26) being connected to the bottom of the filter cartridge (15), the backwash pipe (25) penetrating the outer casing (2) and being connected to an external high-pressure flushing component.

7. The energy-saving device for hot water heat recovery in a dishwasher according to claim 6, characterized in that, The base plate (1) has multiple round holes (27), and the waste discharge pipe (26) and the drain pipe (19) are both located above one of the round holes (27).

8. The energy-saving device for hot water heat recovery in a dishwasher according to claim 1, characterized in that, A heat dissipation assembly (3) is fixedly installed on the top of the outer casing (2), and the heat dissipation assembly (3) is used to dissipate heat from the electrical box (4) and the interior of the outer casing (2).

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