Hot gas recycling and preheating device

Abstract

The utility model discloses a hot gas recycling and preheating device, and belongs to the technical field of waste heat and gas, the hot gas recycling and preheating device comprises a preheating assembly and a hot gas collecting cover which are installed on a dish washing machine, the preheating assembly comprises a preheating box, and a preheating coil pipe is installed in the preheating box; the two ends of the preheating coil pipe are connected with the liquid storage tank and the cleaning box respectively, and the preheating box is installed on the top of the cleaning box. A draught fan is installed on the side wall of the preheating box and communicates with the interior of the preheating box, and the other end of the draught fan is connected with a hot air collecting cover through a pipeline. The cold water can be preheated, the heating time of the cold water is shortened, the energy consumption is reduced, the working efficiency is improved, and the cost is saved.

Description

Technical Field

[0001] This application relates to a heat recovery and preheating device, belonging to the field of waste heat and waste gas technology. Background Technology

[0002] In the traditional operation of commercial dishwashers, the washing process consumes a lot of hot water, which consumes a lot of energy during the heating process. After the washing is finished, the used hot water and the generated heat are often directly discharged, resulting in a lot of heat energy wastage.

[0003] With the escalating global energy crisis and heightened environmental awareness, energy conservation and emission reduction have become crucial issues across all industries. In the catering industry, commercial dishwashers, as one of the most energy-intensive appliances, have seen widespread attention focused on improving their energy efficiency. Therefore, developing devices that can effectively recover and utilize the waste heat generated during the dishwashing process has become an urgent need within the industry.

[0004] The emergence of heat recovery preheating devices was precisely to solve this problem. With this device, commercial dishwashers can transfer the heat generated during the washing process to cold water via heat exchange, preheating the water. In this way, the cold water, which previously required a large amount of energy to heat, can now be preheated using the residual heat generated during the washing process, thus significantly reducing energy consumption. Utility Model Content

[0005] The technical problem to be solved by this application is to overcome the shortcomings of the prior art and provide a heat recovery preheating device that can preheat cold water, reduce the heating time of cold water and reduce energy consumption, improve working efficiency and save costs.

[0006] The technical solution adopted by this application to solve its existing problems is:

[0007] A heat recovery preheating device includes a preheating component installed on a dishwasher and a heat collection hood. The preheating component includes a preheating box, in which a preheating coil is installed. The two ends of the preheating coil are respectively connected to a liquid storage tank and a cleaning tank. The preheating box is installed on top of the cleaning tank.

[0008] A fan is installed on the side wall of the preheating box. The fan is connected to the inside of the preheating box, and the other end of the fan is connected to the hot gas collection hood through a pipe.

[0009] Preferably, the lower end of the preheating coil is provided with a first switch port, and the first switch port is provided with a first stepped surface and a second stepped surface;

[0010] A first switch is installed on the first switch port. The first switch includes a first switch blocking plate and a first switch spring. One end of the first switch spring is fixedly connected to the first switch blocking plate, and the other end is fixedly connected to the second stepped surface.

[0011] Preferably, the cleaning tank includes a cover plate with a central through hole. A power valve is radially installed on the cover plate. The power valve has a power valve stem inside. The lower end of the power valve stem is connected to a pressure plug. The pressure plug is installed inside the cleaning tank and is slidably connected to the inner wall of the cleaning tank.

[0012] Preferably, the pressure plug is provided with a second switch port, and the second switch port is provided with a third stepped surface;

[0013] A second switch is installed at the second switch port. The second switch includes a second switch blocking plate, a second switch spring, and a switch top rod. One end of the second switch spring is fixedly connected to the second switch blocking plate, and the other end is fixedly connected to the third step surface.

[0014] Preferably, a switch top rod is fixedly installed in the middle of the second switch blocking plate, and the second switch spring is sleeved on the switch top rod; the middle through hole connects the first switch port and the second switch port.

[0015] Preferably, the cleaning tank includes a heat insulation layer, a heat preservation layer, a heating tube, and a heating layer. The heating tube is located inside the heat preservation layer and is used to heat the cleaning solution inside the cleaning tank.

[0016] Preferably, the lower end of the cleaning tank is provided with a butterfly valve switch port, which is connected to the spray device inside the dishwasher. The lower end of the cleaning tank is also equipped with a butterfly valve, which is used to control the opening or closing of the butterfly valve switch port.

[0017] Preferably, the preheating box is also equipped with a drain valve, which is used to drain the gas or liquid in the preheating box. The drain valve can be connected to a pipeline for draining.

[0018] Compared with the prior art, the beneficial effects of this application are as follows:

[0019] This application enables the preheating of cold water, reducing the heating time and energy consumption, improving work efficiency, and saving costs.

[0020] The design of the cleaning nozzle reduces the accumulation of dirt inside the preheating chamber, improving the preheating chamber's performance and lifespan. Attached Figure Description

[0021] Figure 1 This is a structural diagram showing the connection between a heat recovery preheating device and a dishwasher according to this application;

[0022] Figure 2 This is a structural diagram of a heat recovery preheating device according to this application;

[0023] Figure 3 This is a partial sectional front view of a heat recovery preheating device according to this application;

[0024] Figure 4 This is a partial enlarged view of section A in the main cross-sectional view of a heat recovery preheating device according to this application;

[0025] Figure 5 This is a partial enlarged view of section B in the main cross-sectional view of a heat recovery preheating device according to this application.

[0026] In the picture:

[0027] 1. Preheating Components; 101. Cleaning Box; 1011. Insulation Layer; 1012. Thermal Insulation Layer; 1013. Heating Element; 1014. Heating Layer; 1015. Butterfly Valve Switch Port; 1016. Cover Plate; 1017. Central Through Hole; 1018. Third Switch Port; 1019. Fourth Step Surface; 102. Preheating Box; 103. Power Valve; 1031. Lower Pressure Plug; 1032. Power Valve Stem; 1033. Second Switch Port; 1034. Third Step Surface; 1035. Sensor; 104. Fan; 105. Preheating Coil; 105 1. Upper inlet; 1052. First switch port; 1053. First step surface; 1054. Second step surface; 106. Cleaning nozzle; 107. Cleaning pipe; 108. Butterfly valve; 2. Hot air collection hood; 3. Liquid storage tank; 301. Water pump; 4. First switch; 401. First switch blocking plate; 402. First switch spring; 5. Second switch; 501. Second switch blocking plate; 502. Second switch spring; 503. Switch top rod; 6. Third switch; 601. Third switch blocking plate; 602. Third switch spring; 7. Drain valve. Detailed Implementation

[0028] The specification and claims use certain terms to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0029] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "horizontal", etc., 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 element 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.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] like Figures 1-5 The illustrated heat recovery preheating device includes a preheating component 1 and a heat collection hood 2 installed on a dishwasher. The preheating component 1 includes a cleaning tank 101 and a preheating tank 102, with the preheating tank 102 mounted on top of the cleaning tank 101. A preheating coil 105 is installed inside the preheating tank 102, with its upper end extending out of the preheating tank 102 and connected to a storage tank 3 via a pipe. The lower end of the preheating coil 105 is connected to the cleaning tank 101. A water pump 301 is provided at the upper outlet of the storage tank 3 for injecting cleaning fluid into the cleaning tank 101 through the preheating coil 105.

[0032] A fan 104 is installed on the side wall of the preheating box 102. One end of the fan 104 is connected to the inside of the preheating box 102, and the other end of the fan 104 is connected to the hot air collection hood 2 through a pipe. When the dishwasher is cleaning the dishes, the hot air generated by the high temperature cleaning liquid is collected by the hot air collection hood 2. Under the action of the fan 104, the hot air is blown into the preheating box 102. The hot air directly acts on the preheating coil 105 to preheat the cleaning liquid in the preheating coil 105. The preheating coil 105 is made of copper, which has good heat exchange and thermal conductivity.

[0033] The lower end of the preheating coil 105 is provided with a first switch port 1052, which is a stepped hole with a first stepped surface 1053 and a second stepped surface 1054 inside. A first switch 4 is installed on the first switch port 1052. The first switch 4 includes a first switch blocking plate 401 and a first switch spring 402. One end of the first switch spring 402 is fixedly connected to the first switch blocking plate 401, and the other end is fixedly connected to the second stepped surface 1054.

[0034] The cleaning tank 101 includes a cover plate 1016 with a central through hole 1017. A power valve 103 is radially mounted on the cover plate 1016. The power valve 103 has a power valve stem 1032, which is slidably connected to the cover plate 1016. A lower pressure plug 1031 is connected to the lower end of the power valve stem 1032. The lower pressure plug 1031 is installed inside the cleaning tank 101 and slidably connected to the inner wall of the cleaning tank 101. The power valve 103 drives the power valve stem 1032 to move up and down, thereby driving the lower pressure plug 1031 to move up and down. The power valve 103 can be a hydraulic valve, a solenoid valve, a pneumatic valve, etc.

[0035] The lower pressure plug 1031 is provided with a second switch port 1033, which is a stepped hole, and a third stepped surface 1034 is provided inside the second switch port 1033. A second switch 5 is installed at the second switch port 1033. The second switch 5 includes a second switch blocking plate 501, a second switch spring 502, and a switch push rod 503. One end of the second switch spring 502 is fixedly connected to the second switch blocking plate 501, and the other end is fixedly connected to the third stepped surface 1034.

[0036] A switch top rod 503 is fixedly installed in the middle of the second switch blocking plate 501, and the second switch spring 502 is sleeved on the switch top rod 503. The middle through hole 1017 connects the first switch port 1052 and the second switch port 1033.

[0037] The lower end of the cleaning tank 101 is provided with a third switch port 1018. The third switch port 1018 is a stepped hole with a fourth step surface 1019 inside. A third switch 6 is installed at the third switch port 1018. The third switch 6 includes a third switch blocking plate 601 and a third switch spring 602. One end of the third switch spring 602 is fixedly connected to the fourth step surface 1019, and the other end is fixedly connected to the third switch blocking plate 601.

[0038] The preheating component 1 is also equipped with a cleaning pipe 107. The lower end of the cleaning pipe 107 is connected to the third switch port 1018, and the upper end is connected to the preheating box 102 and extends into the preheating box 102.

[0039] The hot air generated by the dishwasher during operation contains certain impurities, such as grease vapor. These impurities will adhere to the inner wall of the preheating chamber 102 and the preheating coil 105 during the heat recovery process. In addition, during the heat exchange process, scale may form on the inner wall of the preheating chamber 102 due to temperature changes and humidity. Over time, these dirt will gradually accumulate and eventually affect the heat exchange efficiency, resulting in a decrease in the preheating effect. Therefore, the preheating chamber 102 needs to be cleaned. A cleaning nozzle 106 is installed at one end of the cleaning pipe 107 located inside the preheating chamber 102. The cleaning nozzle 106 is used to clean the preheating chamber 102.

[0040] The preheating box 102 is also equipped with a drain valve 7, which is used to drain the gas or liquid in the preheating box 102. The drain valve 7 can be connected to a pipeline for drainage.

[0041] The cleaning tank 101 includes a heat insulation layer 1011, a heat preservation layer 1012, a heating element 1013, and a heating layer 1014. The heating element 1013 is located inside the heat preservation layer 1012 and is used to heat the cleaning liquid inside the cleaning tank 101. A butterfly valve switch port 1015 is provided at the lower end of the cleaning tank 101. The butterfly valve switch port 1015 is connected to the spray device inside the dishwasher. A butterfly valve 108 is also installed at the lower end of the cleaning tank 101, and the butterfly valve 108 is used to control the opening or closing of the butterfly valve switch port 1015.

[0042] When not in operation, the first switch spring 402 is in a retracted state, and the first switch blocking plate 401 abuts against the first stepped surface 1053, blocking the first switch opening 1052. The power valve 103 drives the lower pressure plug 1031 to separate from the cover plate 1016, the second switch spring 502 is in a retracted state, and the second switch blocking plate 501 abuts against the bottom surface of the lower pressure plug 1031, blocking the second switch opening 1033. The third switch spring 602 is in a retracted state, and the third switch blocking plate 601 abuts against the bottom surface of the cleaning tank 101, blocking the third switch opening 1018.

[0043] Combination Figure 3 As shown, the working process of the heat recovery preheating device is as follows:

[0044] The power valve 103 drives the power valve rod 1032 to move upward, which in turn drives the lower pressure plug 1031 to move upward until it abuts against the bottom surface of the cover plate 1016. At this time, the switch push rod 503 on the second switch block plate 501 passes through the first switch spring 402 and abuts against the first switch block plate 401, pushing the first switch block plate 401 to separate from the first step surface 1053, thereby opening the first switch port 1052. Due to the interaction force, during the process of the switch push rod 503 pushing open the first switch block plate 401, the second switch block plate 501, which is fixedly connected to the switch push rod 503, will move downward under the interaction force, causing the second switch block plate 501 to separate from the bottom surface of the lower pressure plug 1031, thereby opening the second switch port 1033. The water pump 301 pumps the cleaning liquid in the storage tank 3 to the preheating coil 105. The cleaning liquid in the preheating coil 105 enters the cleaning tank 101 through the first switch port 1052, the middle through hole 1017 and the second switch port 1033. A sensor 1035 is provided on the lower pressure plug 1031. When the cleaning liquid reaches the bottom surface of the lower pressure plug 1031, the water pump 301 stops pumping the cleaning liquid. The heating tube 1013 heats the cleaning liquid in the cleaning tank 101. After heating is completed, the butterfly valve 108 opens the butterfly valve switch port 1015, and the cleaning liquid enters the spray device in the dishwasher to clean the tableware. When the sensor 1035 does not detect the cleaning fluid, the water pump 301 continues to pump the cleaning fluid. The heat generated during the cleaning process is collected by the heat collection hood 2. Under the action of the fan 104, the heat is blown into the preheating box 102. The heat acts directly on the preheating coil 105 to preheat the cleaning fluid in the preheating coil 105, reducing the drop in water temperature in the cleaning box 101, reducing the heating time of the cleaning fluid and reducing energy consumption, improving work efficiency and saving costs.

[0045] After the tableware is cleaned, the butterfly valve 108 closes the butterfly valve switch port 1015. At this time, there is still a lot of cleaning liquid left in the cleaning tank 101. Then, the power valve 103 drives the power valve rod 1032 to move downward, which in turn drives the lower pressure plug 1031 to move downward. After the lower pressure plug 1031 moves downward, the switch top rod 503 separates from the first switch blocking plate 401, and the interaction force disappears. Under the reset action of the first switch spring 402 and the second switch spring 502, the first switch port 1052 and the second switch port 1033 are closed. The pressure plug 1031 moves downward, applying pressure to the remaining cleaning fluid. This pressure acts on the third switch plate 601. When the pressure reaches the corresponding value, the third switch port 1018 opens, and the cleaning fluid enters the cleaning nozzle 106 through the cleaning pipe 107. Under pressure, the cleaning fluid is sprayed out from the cleaning nozzle 106 to clean the preheating tank 102. The drain valve 7 opens, and the cleaned liquid flows out through the drain valve 7 until the pressure plug 1031 moves to the bottom of the cleaning tank 101, completing the cleaning process. The pressure on the third switch plate 601 disappears, and the third switch spring 602 drives the third switch plate 601 to reset, closing the third switch port 1018. The power valve stem 1032 drives the pressure plug 1031 to reset upward, ready for the next operation.

[0046] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A heat recovery and preheating device, characterized in that: The device includes a preheating assembly (1) installed on a dishwasher and a hot air collection hood (2). The preheating assembly (1) includes a preheating box (102), in which a preheating coil (105) is installed. The two ends of the preheating coil (105) are respectively connected to a liquid storage tank (3) and a cleaning tank (101). The preheating box (102) is installed on top of the cleaning tank (101). A fan (104) is installed on the side wall of the preheating box (102). The fan (104) is connected to the inside of the preheating box (102). The other end of the fan (104) is connected to the hot gas collection hood (2) through a pipe.

2. The heat recovery preheating device according to claim 1, characterized in that: The lower end of the preheating coil (105) is provided with a first switch port (1052), and the first switch port (1052) is provided with a first step surface (1053) and a second step surface (1054). A first switch (4) is installed on the first switch port (1052). The first switch (4) includes a first switch blocking plate (401) and a first switch spring (402). One end of the first switch spring (402) is fixedly connected to the first switch blocking plate (401), and the other end is fixedly connected to the second step surface (1054).

3. The heat recovery preheating device according to claim 2, characterized in that: The cleaning tank (101) includes a cover plate (1016) with a central through hole (1017). A power valve (103) is radially mounted on the cover plate (1016). The power valve (103) has a power valve stem (1032) that is slidably connected to the cover plate (1016). A lower pressure plug (1031) is connected to the lower end of the power valve stem (1032). The lower pressure plug (1031) is installed inside the cleaning tank (101) and is slidably connected to the inner wall of the cleaning tank (101).

4. The heat recovery preheating device according to claim 3, characterized in that: The lower pressure plug (1031) is provided with a second switch port (1033), and the second switch port (1033) is provided with a third stepped surface (1034); A second switch (5) is installed at the second switch port (1033). The second switch (5) includes a second switch blocking plate (501), a second switch spring (502), and a switch top rod (503). One end of the second switch spring (502) is fixedly connected to the second switch blocking plate (501), and the other end is fixedly connected to the third step surface (1034).

5. A heat recovery preheating device according to claim 4, characterized in that: A switch top rod (503) is fixedly installed in the middle of the second switch block plate (501), and the second switch spring (502) is sleeved on the switch top rod (503); the middle through hole (1017) connects the first switch port (1052) and the second switch port (1033).

6. The heat recovery preheating device according to claim 1, characterized in that: The cleaning tank (101) includes a heat insulation layer (1011), a heat preservation layer (1012), a heating tube (1013), and a heating layer (1014). The heating tube (1013) is located inside the heat preservation layer (1012) and is used to heat the cleaning liquid in the cleaning tank (101).

7. A heat recovery preheating device according to claim 6, characterized in that: The cleaning tank (101) is provided with a butterfly valve switch port (1015) at the lower end. The butterfly valve switch port (1015) is connected to the spray device in the dishwasher. The cleaning tank (101) is also equipped with a butterfly valve (108) at the lower end. The butterfly valve (108) is used to control the opening or closing of the butterfly valve switch port (1015).

8. The heat recovery preheating device according to claim 1, characterized in that: The preheating box (102) is also equipped with a drain valve (7), which is used to drain the gas or liquid in the preheating box (102). The drain valve (7) can be connected to a pipeline for drainage.

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