Waste water heat recovery device easy to clean

Abstract

The utility model relates to the technical field of dish-washing machines, in particular to a waste water heat recovery device easy to clean, which comprises a hot waste water recovery box, a hot waste water inlet pipeline of the hot waste water recovery box is communicated with an overflow port of the dish-washing machine, and a hot waste water outlet pipeline of the hot waste water recovery box is communicated to a sewer drain pipe. A heat exchange coil pipe communicated with a tap water pipe is mounted in the hot wastewater recycling tank; at least one spraying pipe communicated with a tap water pipe is arranged on the upper portion of the heat exchange coil pipe, and a plurality of spraying heads used for spraying and cleaning and a control valve used for controlling the spraying heads to spray are arranged on the spraying pipe. Due to the fact that impurities such as greasy dirt exist in the waste hot water, the impurities can be adhered to corners or break angles during circulation, a spraying pipe and a spraying head are arranged, the spraying head sprays and cleans the interior of the hot waste water recycling box, the impurities can be flushed out of the hot waste water recycling box in the water flow direction, the cleanliness in the waste water recycling box is guaranteed, and the service life of the hot waste water recycling box is prolonged. The circulation smoothness of the hot waste water and the operation efficiency of the device are ensured.

Description

Technical Field

[0001] This utility model relates to the field of dishwasher technology, specifically to an easy-to-clean wastewater heat recovery device. Background Technology

[0002] In existing dishwashers, hot water is typically used to rinse the dishes, which can better remove the grease and grime. Therefore, it is necessary to heat the cold tap water first.

[0003] In existing technologies, the heat energy of flushed hot wastewater is used to preheat cold tap water. This method can make full use of heat energy and reduce heat loss. However, since hot wastewater usually contains oil, debris, etc., it will stick to the inner wall of the hot wastewater recovery tank or get tangled on other components inside the tank, which will affect the smooth flow of wastewater and reduce the efficiency of operation. Moreover, the wastewater recovery box needs to be disassembled for cleaning, which is too cumbersome. Repeated disassembly will reduce the service life of the device. Utility Model Content

[0004] In view of the problems in existing technologies where impurities in hot wastewater remain in the hot wastewater recovery tank, making it difficult to clean and affecting the smooth flow of hot wastewater, thus reducing operational efficiency, this utility model provides an easy-to-clean wastewater heat recovery device.

[0005] This utility model provides an easy-to-clean wastewater heat recovery device, including a wastewater recovery tank. The wastewater inlet pipe of the wastewater recovery tank is connected to the overflow outlet of a dishwasher, and the wastewater outlet pipe of the wastewater recovery tank is connected to a sewer drain pipe. A heat exchange coil connected to a tap water pipe is installed inside the wastewater recovery tank. At least one spray pipe connected to a tap water pipe is provided on the upper part of the heat exchange coil. The spray pipe is provided with a plurality of spray heads for spray cleaning and a control valve for controlling the spray of the spray heads.

[0006] Furthermore, the control valve is a ball valve, a foot-operated water valve, or a foot solenoid valve.

[0007] Furthermore, the hot wastewater recovery tank is divided into n chambers by multiple parallel partitions. One end of each partition is sealed to one side wall of the hot wastewater recovery tank, and the other end has a notch between it and the other side wall of the hot wastewater recovery tank for hot wastewater to flow through. The notches formed by two adjacent partitions and the side walls of the hot wastewater recovery tank are in opposite directions. Hot wastewater can flow in a serpentine manner through the notch in the hot wastewater recovery tank, and the heat exchange coil passes through the notch.

[0008] The hot wastewater inlet is connected to the first chamber, and the heat exchange coil extends from the nth chamber to the first chamber. The end of the heat exchange coil in the nth chamber is connected to a tap water pipe, where n is an integer greater than or equal to 1.

[0009] Furthermore, the spray pipe is arranged perpendicular to the partition, and at least one spray head is provided in each chamber.

[0010] Furthermore, the spray head is inclined in the direction of hot wastewater flow.

[0011] Furthermore, the inlet of the control valve is connected to a tap water pipe or a heat exchange coil, and the outlet is connected to a spray pipe.

[0012] Furthermore, where n = 4.

[0013] Furthermore, the number of spray pipes is 3.

[0014] Furthermore, the multiple spray pipes are connected by connecting pipes, and the control valve controls the flow of tap water into the multiple spray pipes.

[0015] Furthermore, the control valve is installed on the outer side of the hot wastewater recovery tank.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This utility model patent involves installing a heat exchange coil inside a hot wastewater recovery tank. This allows the heat of the hot wastewater flowing into the tank to preheat the cold tap water within the coil. Since wastewater typically contains oil and debris, these substances tend to adhere to the corners of the heat exchange coil or other bends in the tank. Therefore, a spray pipe connected to the heat exchange coil is installed at the top of the coil. Spraying water from nozzles on the spray pipe cleans the inside of the wastewater recovery tank, allowing debris to be flushed out with the water flow. This ensures the cleanliness of the wastewater recovery tank, further guaranteeing smooth wastewater flow and improving the device's operational efficiency.

[0018] It should be understood that the description in this utility model description section is not intended to limit the key or essential features of the embodiments of this utility model, nor is it intended to restrict the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a diagram of the internal structure of the wastewater heat recovery device in Example 1.

[0021] Figure 2 This is a structural diagram of some parts of the wastewater heat recovery device in Example 1.

[0022] Figure 3 This is a structural diagram of the wastewater heat recovery device in Example 2.

[0023] Figure 4 This is a structural diagram of the wastewater heat recovery device in Example 3.

[0024] Numbered in the diagram: 1. Hot wastewater recovery tank; 2. Hot wastewater inlet; 3. Hot wastewater outlet; 4. Heat exchange coil; 5. Spray pipe; 51. Spray head; 521. Ball valve; 522. Foot pedal water valve; 523. Foot solenoid valve; 53. Connecting pipe; 6. Partition; 7. Chamber; 71. First chamber; 72. Second chamber; 73. Third chamber; 74. Fourth chamber; 8. Notch; 9. Cold water inlet; 10. Cold water outlet. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0026] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0027] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] Example 1:

[0029] The wastewater heat recovery device of this patent can be installed as an external device on an existing dishwasher, or it can be integrated into the dishwasher for recycling and reusing the dishwasher's hot wastewater.

[0030] Please refer to Figures 1-2This utility model provides an easy-to-clean wastewater heat recovery device, including a wastewater recovery tank 1, a wastewater inlet 2 pipe connected to the overflow outlet of a dishwasher, and a wastewater outlet 3 pipe connected to a sewer drain pipe; a heat exchange coil 4 connected to a tap water pipe is installed inside the wastewater recovery tank 1; at least one spray pipe 5 connected to a tap water pipe is provided on the upper part of the heat exchange coil 4, and a plurality of spray heads 51 for spray cleaning and a control valve for controlling the spray of the spray heads 51 are provided on the spray pipe 5.

[0031] Furthermore, the control valve is located on the outer side of the hot wastewater recovery tank 1, and in this embodiment, the control valve is a ball valve 521. By turning the ball valve 521, tap water enters the spray pipe 5, thereby controlling the spray head 51 to spray tap water to clean the hot wastewater recovery tank 1.

[0032] In this embodiment, a heat exchange coil 4 is installed inside the hot wastewater recovery tank 1. The heat of the hot wastewater flowing into the hot wastewater recovery tank 1 can be used to preheat the cold tap water in the heat exchange coil 4. Since the wastewater usually contains oil and debris, when the wastewater flows in the wastewater recovery tank, the oil and debris will stick to the corners of the heat exchange coil 4 or the bends of the hot wastewater recovery tank 1. Therefore, a spray pipe 5 connected to the heat exchange coil 4 is installed on the upper part of the heat exchange coil 4. Water is sprayed from the spray head 51 on the spray pipe 5 to clean the inside of the hot wastewater recovery tank 1, so that the debris can be flushed out of the hot wastewater recovery tank 1 with the water flow, ensuring the cleanliness of the wastewater recovery tank, and further ensuring the smooth flow of hot wastewater and the operating efficiency of the device.

[0033] In this embodiment, hot wastewater flows from the dishwasher overflow pipe into the hot wastewater recovery tank 1 through the hot wastewater inlet 2, and preheats the cold tap water in the heat exchange coil 4 installed in the hot wastewater recovery tank 1. Since the wastewater in the dishwasher still has a temperature of about 60 degrees Celsius after washing, the heat of the wastewater is used to preheat the tap water. Then, the preheated tap water is reheated in subsequent steps, which speeds up the heating process and further saves heating energy. Using the heat in the wastewater to heat the tap water makes full use of the heat energy without causing energy loss, and further achieves the purpose of energy saving and emission reduction.

[0034] Furthermore, since there may be some debris and oil in the hot wastewater in the hot wastewater recovery tank 1, which may stick to the inner wall of the hot wastewater recovery tank 1 or the corner of the heat exchange coil 4, it is necessary to control the control valve to make the spray head 51 spray tap water to clean the hot wastewater recovery tank 1 in a timely manner, so as to ensure the cleanliness of the wastewater recovery tank, and further ensure the smooth flow of hot wastewater and the operating efficiency of the device.

[0035] Furthermore, the flow rate and volume of the water sprayed from the spray head 51 can be controlled by adjusting the opening and closing degree of the control valve; in this embodiment, the flow rate and volume of the water sprayed from the spray head 51 can be controlled by turning the angle of the control valve ball valve 521.

[0036] Furthermore, the control valve can be set at any position on the outer side of the hot wastewater recovery tank 1. The inlet end of the control valve is connected to the tap water pipe or the heat exchange coil 4, and the outlet end is connected to the spray pipe 5. In this embodiment, a spray pipe 5 is set. Turning the ball valve 521 allows tap water to flow from the tap water pipe to the spray pipe 5 and spray out through the spray head 51 to spray and clean the inner wall of the hot wastewater recovery tank 1.

[0037] like Figure 1 and Figure 2 As shown, the hot wastewater recovery tank 1 is divided into n chambers 7 by multiple parallel partitions 6. One end of the partition 6 is sealed to one side wall of the hot wastewater recovery tank 1, and the other end has a gap 8 between it and the other side wall of the hot wastewater recovery tank 1 for hot wastewater to flow through. The gaps 8 formed by two adjacent partitions 6 and the side wall of the hot wastewater recovery tank 1 are in opposite directions. Hot wastewater can flow in a serpentine manner through the gaps 8 in the hot wastewater recovery tank 1. The heat exchange coil 4 passes through the gaps 8.

[0038] To further explain, the hot wastewater inlet 2 is connected to the first chamber 71, the heat exchange coil 4 extends from the nth chamber 7 to the first chamber 71, and the end of the heat exchange coil 4 in the nth chamber 7 is connected to the tap water pipe, where n is an integer greater than or equal to 1.

[0039] In this embodiment, hot wastewater flows into the first chamber 71 from the hot wastewater inlet 2, and is separated by the partition 6 so that the wastewater flows in a serpentine manner into the second chamber 72, the third chamber 73, the fourth chamber 74 and the nth chamber 7, and is finally discharged from the hot wastewater outlet 3; cold tap water flows into the heat exchange coil 4 in the nth chamber 7 from the cold water inlet 9, and then flows along the disc-shaped structure of the heat exchange coil 4 to the fourth chamber 74, the third chamber 73, the second chamber 72 and the first chamber 71, and finally flows out from the cold water outlet 10 provided on the side wall of the first chamber 71.

[0040] Furthermore, since the temperature of the hot wastewater gradually decreases as it flows, the water temperature is higher closer to the hot wastewater inlet 2 and lower closer to the hot wastewater outlet 3. By placing the cold water inlet 9 next to the hot wastewater outlet 3 and the cold water outlet 10 next to the hot wastewater inlet 2, the cold water in the heat exchange coil 4 flows against the direction of the hot wastewater flow. This ensures that the tap water flowing out of the cold water outlet 10 is at its highest temperature, further guaranteeing the heating effect of the hot wastewater on the cold water and enhancing the efficiency of heat reuse.

[0041] Furthermore, the disc-shaped pipe structure of the heat exchange coil 4 can increase the length of the heat exchange coil 4, thereby increasing the length of the cold water flowing in the heat wastewater recovery tank 1, which can further ensure that the cold water in the heat exchange coil 4 can be fully heated.

[0042] like Figure 1 As shown, the spray head 51 is inclined in the direction of hot wastewater flow.

[0043] In this embodiment, since the debris in the hot wastewater will stick to the corners of the heat exchange tubes, the corners of the partition 6, or the corners of the hot wastewater recovery tank 1 as the water flows, setting the spray angle of the spray head 51 to be in the direction of the flow of the waste hot water is more conducive to washing off the debris, which can effectively improve the efficiency of spray cleaning.

[0044] like Figure 1 As shown, the spray pipe 5 is set perpendicularly to the partition 6, and at least one spray head 51 is installed in each chamber 7.

[0045] In this embodiment, at least one spray head 51 is provided in each chamber 7, which can be used to spray and clean the outer wall of the heat exchange tube in the chamber 7, and can also clean the wall of the partition 6 in the chamber 7, so as to ensure the cleanliness of each chamber 7 and further improve the efficiency of the operation.

[0046] Example 2:

[0047] like Figure 3 As shown, there are multiple spray pipes 5, which are connected by a connecting pipe 53. The control valve controls the flow of tap water into the multiple spray pipes 5. The difference between Example 2 and Example 1 is that the control valve is a solenoid valve 523. The solenoid valve 523 controls the flow of tap water into the spray pipes 5, and then controls the spray head 51 to spray tap water to clean the hot wastewater recovery tank 11.

[0048] In this embodiment, the spray pipes 5 are set as three parallel pipes, and adjacent spray pipes 5 are connected by a connecting pipe 53. The solenoid valve 523 controls the tap water to enter the three spray pipes 5. The three spray pipes 5 are evenly distributed in the hot wastewater recovery tank 1 and are directly opposite the heat exchange coil 4, which can be used to clean the heat exchange coil 4 in a targeted manner and can achieve the purpose of thoroughly cleaning the inside of the hot wastewater recovery tank 1.

[0049] Example 3:

[0050] like Figure 4 As shown, the difference between Example 3 and Example 2 is that the control valve adopts a foot-operated water valve 522. By pressing the control switch of the foot-operated water valve 522, tap water is controlled to enter the spray pipe 5, thereby causing the spray head 51 to spray tap water to clean the hot wastewater recovery tank 1.

[0051] It should be understood that the specific embodiments described above are only for explaining the present invention and are not intended to limit the present invention. Obvious variations or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. An easy-to-clean wastewater heat recovery device, characterized in that, The device includes a hot wastewater recovery tank (1), the hot wastewater inlet (2) of which is connected to the overflow outlet of the dishwasher, and the hot wastewater outlet (3) of which is connected to the sewer drain pipe; a heat exchange coil (4) connected to a tap water pipe is installed inside the hot wastewater recovery tank (1); at least one spray pipe (5) connected to a tap water pipe is provided on the upper part of the heat exchange coil (4), and a plurality of spray heads (51) for spray cleaning and a control valve for controlling the spray head (51) spray are provided on the spray pipe (5).

2. The easy-to-clean wastewater heat recovery device according to claim 1, characterized in that, The control valve is a ball valve (521), a foot-operated water valve (522), or a foot solenoid valve (523).

3. The easy-to-clean wastewater heat recovery device according to claim 1, characterized in that, The hot wastewater recovery tank (1) is divided into n chambers (7) by multiple parallel partitions (6). One end of each partition (6) is sealed to one side wall of the hot wastewater recovery tank (1), and the other end has a notch (8) between it and the other side wall of the hot wastewater recovery tank (1) for hot wastewater to flow. The direction of the notch (8) formed by two adjacent partitions (6) and the side wall of the hot wastewater recovery tank (1) is opposite. Hot wastewater can flow in a serpentine manner through the notch (8) in the hot wastewater recovery tank (1). The heat exchange coil (4) passes through the notch (8). The hot wastewater inlet (2) is connected to the first chamber (71), the heat exchange coil (4) extends from the nth chamber to the first chamber (71), and the end of the heat exchange coil (4) in the nth chamber is connected to the tap water pipe, where n is an integer greater than or equal to 1.

4. The easy-to-clean wastewater heat recovery device according to claim 3, characterized in that, The spray pipe (5) is arranged perpendicularly to the partition (6), and at least one spray head (51) is provided in each chamber (7).

5. The easy-to-clean wastewater heat recovery device according to claim 1, characterized in that, The spray head (51) is inclined in the direction of hot wastewater flow.

6. The easy-to-clean wastewater heat recovery device according to claim 1, characterized in that, The inlet of the control valve is connected to a tap water pipe or a heat exchange coil (4), and the outlet is connected to a spray pipe (5).

7. The easy-to-clean wastewater heat recovery device according to claim 3, characterized in that, Where n=4.

8. The easy-to-clean wastewater heat recovery device according to claim 1, characterized in that, The number of spray pipes (5) is 3.

9. The easy-to-clean wastewater heat recovery device according to claim 1, characterized in that, The multiple spray pipes (5) are connected by a connecting pipe (53), and the control valve controls the flow of tap water into the multiple spray pipes (5).

10. The easy-to-clean wastewater heat recovery device according to claim 1, characterized in that, The control valve is installed on the outer side of the hot wastewater recovery tank (1).

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