A cleaning system with heat recovery

Abstract

The application provides a cleaning system with heat recovery, which comprises a cleaning box, a steam heat recovery device and a blowing and drying assembly. Steam in the cleaning box can enter a heat exchange box through a steam inlet, the steam heat recovery device can recover heat of the steam in the heat exchange box, and a steam outlet is connected to the blowing and drying assembly. The blowing and drying assembly is provided with a blowing port for blowing and cleaning cleaning objects in the cleaning box. The steam after heat recovery and the wet hot gas generated by drying can enter the cleaning box again, which not only has the effect of blowing and cleaning the cleaning objects, but also makes the steam pass through the steam heat recovery device again to recover heat in the steam again, thereby improving the recovery and utilization rate of heat in the steam. In addition, the steam heat recovery device further comprises a heat storage circuit, so that heat recovery can be realized when the cleaning objects are not in cleaning, that is, when the cleaning system is in a standby state, and the heat recovery rate is obviously improved.

Description

Technical Field

[0001] This invention relates to the field of cleaning systems, and more specifically to a cleaning system with heat recovery. Background Technology

[0002] An automatic dishwasher is a device that replaces manual labor to wash tableware or cooking utensils such as bowls, plates, dishes, cups, spoons, chopsticks, knives and forks, pots, and spatulas. It can reduce the intensity of manual labor, improve work efficiency, and enhance cleanliness and hygiene.

[0003] Dishwashers primarily clean dishes by spraying hot water through spray pipes, with the water temperature typically reaching around 80 degrees Celsius. Most current dishwashers heat cold water directly through a heating device before sending it to the spray pipes. However, the wastewater after cleaning also reaches temperatures of around 50-60 degrees Celsius, and the steam generated during spraying is also very hot. This heat energy should be recovered.

[0004] Existing technologies include systems that at least partially recover such thermal energy. For example, in US3598131A, steam is removed from the dishwasher by suction via a suction removal device and conveyed into a cavity, where it is then conducted via a heat exchanger. This heat exchanger is constructed of a porous material, which is sprayed with clean water. The condensed moisture is collected and fed back into the dishwasher.

[0005] However, the steam that has undergone heat recovery still has a certain level of humidity and temperature. When it is discharged into the working environment, it affects the temperature and humidity of the working environment, thereby affecting the comfort and hygiene of the working environment, and also causing a waste of heat energy.

[0006] Furthermore, automatic dishwashers typically have a standby state, meaning the cleaning equipment is ready to operate but does not actually perform the cleaning process. During this period, at least one fluid tank for storing the cleaning fluid usually preheats the cleaning fluid to prepare it for normal operation. The heating process of the cleaning fluid easily generates excess steam; in addition, after the high-temperature cleaning fluid spray ends, residual steam remains inside the cleaning chamber; all of these factors contribute to the generation of excess steam, and current technology cannot recover the heat energy from this steam during standby. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a cleaning system with heat recovery.

[0008] This invention is implemented using the following scheme:

[0009] This invention proposes a cleaning system with heat recovery, characterized by comprising a cleaning chamber, a steam heat recovery device, and a blowing and drying assembly. The items to be cleaned can be cleaned and dried within the cleaning chamber. The cleaning chamber is equipped with a circulating fluid spray head, a blower, a cleaning fluid spray head, and an annular air duct arranged sequentially according to the order in which the items pass. The steam heat recovery device includes a heat exchange chamber with a steam inlet and a steam outlet. Steam from the cleaning chamber enters the heat exchange chamber through the steam inlet. The steam heat recovery device recovers heat from the steam within the heat exchange chamber. The steam outlet is connected to the blowing and drying assembly, which includes a blowing duct and a drying duct. The blowing duct is equipped with the blower for blowing clean air onto the items in the cleaning chamber. The drying duct includes a dehumidifier, a heating device, and the annular air duct for blowing out hot dry gas to dry the items.

[0010] In one embodiment, a filter device is further included between the blowing and drying assembly and the steam outlet; the blowing duct also includes a first guide and a first fan, with the first guide, the first fan and the air outlet connected in sequence; the drying duct is also provided with a second guide and a second fan, with a dehumidification device, a heating device, the second guide, the second fan and the annular duct connected in sequence.

[0011] In one embodiment, the first fan and the second fan can be turned on or off respectively according to the system's operating mode.

[0012] In one embodiment, the annular air duct is arranged around the cleaning object inside the cleaning chamber, and an annular opening is provided in the annular air duct facing the center.

[0013] In one embodiment, the cleaning system further includes a cleaning fluid tank, and the steam heat recovery device further includes a first liquid inlet pipe. The cleaning fluid tank is connected to the first liquid inlet pipe, and the first liquid inlet pipe includes a steam heat exchange pipe. The steam heat exchange pipe passes through the heat exchange box and can exchange heat with the steam in the heat exchange box, thereby realizing heat recovery of the steam in the heat exchange box.

[0014] In one embodiment, the steam heat exchange tube is bent within the heat exchange chamber.

[0015] In one embodiment, the steam heat recovery device further includes a heat storage reflux pipe, and the first liquid inlet pipeline further includes a first ambient temperature liquid inlet pipe, a liquid inlet tank, a liquid inlet pump, a tee, and a first preheating liquid inlet pipe. The liquid inlet tank is provided with a replenishment inlet, a reflux inlet, and a supply outlet. The first ambient temperature liquid inlet pipe is connected to the replenishment inlet of the liquid inlet tank, the supply outlet of the liquid inlet tank is connected to the steam heat exchange pipe, the outlet end of the steam heat exchange pipe is connected to the liquid inlet pump, the outlet of the liquid inlet pump is connected to the first end of the tee, the second end of the tee is connected to the heat storage reflux pipe, the heat storage reflux pipe is connected to the reflux inlet of the liquid inlet tank, the third end of the tee is connected to the first preheating liquid inlet pipe, and the first preheating liquid inlet pipe is connected to the cleaning fluid tank. A valve is provided on the heat storage reflux pipe, and a valve is provided on the first preheating liquid inlet pipe.

[0016] In one embodiment, the blowing duct further includes a first fan, the drying duct further includes a second fan, and the heat exchange box is equipped with a temperature sensor and a humidity sensor. When the steam temperature and humidity detected by the temperature sensor and humidity sensor in the heat exchange box are higher than a threshold, at least one of the first fan and the second fan is turned on, and the valve on the heat storage return pipe and the liquid inlet pump are turned on in sequence.

[0017] In one embodiment, the cleaning system further includes a waste liquid tank, and the cleaning fluid tank is connected to a second inlet pipe. The second inlet pipe is equipped with a valve and includes a waste liquid heat exchange pipe that passes through the waste liquid tank. The waste liquid heat exchange pipe is capable of exchanging heat with the waste liquid in the waste liquid tank. The waste liquid heat exchange pipe is bent inside the waste liquid tank.

[0018] In one embodiment, both the first and second inlet pipes are equipped with temperature sensors to detect the fluid temperature in the first and second inlet pipes. When the fluid in the cleaning fluid tank is insufficient and the fluid temperature in the first inlet pipe is higher than that in the second inlet pipe, the valve on the first preheating inlet pipe in the first inlet pipe is opened first. When the fluid in the cleaning fluid tank is insufficient and the fluid temperature in the second inlet pipe is higher than that in the first inlet pipe, the valve on the second inlet pipe is opened first.

[0019] The technical solution provided by this invention has the following technical effects:

[0020] 1. This invention provides a heat recovery cleaning system that performs heat recovery treatment on steam. The steam, after heat recovery treatment, re-enters the cleaning chamber, effectively cleaning the items. The dried and heated gas can also be used to dry the items. Furthermore, the steam and the humid gas generated during drying can be further recovered through a steam heat recovery device, improving the recovery rate of heat energy from both the steam and the drying process. Heat recovery via the steam heat recovery device not only increases heat utilization but also reduces steam humidity, improving the durability of the blower components. Additionally, the heat-recovered steam and the humid gas generated during drying circulate only between the cleaning chamber and the heat exchange chamber and are not discharged into the working environment, avoiding impacts on the temperature and humidity, thus preventing compromises to working comfort and hygiene.

[0021] 2. The steam heat recovery device also includes a heat storage circuit, which can be operated even when the cleaning material is not being cleaned, i.e. when the cleaning system is in standby mode. The heat recovery system can still operate, thereby realizing heat recovery when the cleaning system is in standby mode, and the heat recovery rate is significantly improved.

[0022] 3. In this invention, both the first and second inlet pipelines are equipped with valves, and both are also equipped with temperature sensors to detect the fluid temperature within them. The opening sequence of the valves in the first and second inlet pipelines is controlled based on the fluid temperature. By controlling the valve opening sequence, the utilization of recovered heat energy can be maximized, thereby improving the utilization rate of recovered heat energy. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a cleaning system with heat recovery.

[0024] Figure 2 This is a schematic diagram of the steam heat recovery device;

[0025] Figure 3 This is a schematic diagram of the circulating fluid spray assembly;

[0026] Figure 4 This is a schematic diagram of the cleaning fluid spray assembly;

[0027] Figure 5 This is a schematic diagram of the blower and drying components;

[0028] Figure 6 This is a structural diagram of the waste liquid tank, the circulating fluid tank, and the cleaning fluid tank. Detailed Implementation

[0029] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0030] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0031] like Figure 1-6 As shown, this solution provides a cleaning system with heat recovery, including a conveying device 8, a cleaning chamber 7, a circulating fluid spray assembly 30, a cleaning fluid spray assembly 40, a blowing and drying assembly 50, a steam heat recovery device 20, and a waste liquid tank 11. The object to be cleaned 1 is cleaned in the cleaning chamber 7. The steam heat recovery device 20 recovers heat from the steam (a mixture of water vapor and water vapor condensate droplets) generated in the cleaning chamber 7. The cleaning chamber 7 is a box structure with openings at both ends. The conveying device 8 passes through the openings at both ends of the cleaning chamber 7 and extends beyond the openings at both ends. The conveying device 8 is used to transport the object to be cleaned 1 through the cleaning chamber 7, so that the relevant equipment in the cleaning chamber 7 can complete the cleaning of the object to be cleaned 1. Specifically, the cleaning chamber 7 is equipped with a circulating fluid spray head 32, an air outlet 523, a cleaning fluid spray head 43, and an annular air duct 533 arranged sequentially according to the order in which the cleaning item 1 passes. The circulating fluid spray head 32 sprays circulating fluid onto the cleaning item 1 in the cleaning chamber 7 for initial cleaning. The air outlet 523 blows away residual liquid from the surface of the cleaning item 1, especially since liquid tends to accumulate on surfaces with pits. Blowing the cleaning item 1 through the air outlet 523 improves the cleaning effect of subsequent cleaning fluids. The cleaning fluid spray head 43 sprays cleaning fluid onto the cleaning item 1 for a second cleaning. After the second cleaning, the cleaning item 1 passes through the annular air duct 533, where hot dry air blown out 533 dries it. The dried cleaning item 1 is then conveyed to the outside of the cleaning chamber 7 by the conveyor device 8, thus completing the cleaning process for the cleaning item 1.

[0032] Preferably, a water-blocking curtain 15 is also provided in the cleaning chamber 7 between the cleaning fluid spray head 43 and the annular air duct 533. The water-blocking curtain 15 can block liquid splashes through the water-blocking curtain 15, while allowing gas to pass through the water-blocking curtain 15. The water-blocking curtain 15 can prevent liquid generated in the previous cleaning process from splashing onto the cleaned item 1 which is being dried in the annular air duct 533, thereby preventing liquid splashing from contaminating the cleaned item 1 and improving the cleanliness of the cleaned item 1.

[0033] The circulating fluid spray assembly 30 includes a circulating fluid spray head 32, a circulating fluid tank 34, and a circulating fluid pump 31. The circulating fluid pump 31 is used to pump fluid from the circulating fluid tank 34 to the circulating fluid spray head 32 for spraying. The cleaning fluid spray assembly 40 includes a cleaning fluid spray head 43, a cleaning fluid tank 41, and a cleaning fluid pump 42. The cleaning fluid tank 41 can heat the cleaning fluid inside the cleaning fluid tank 41, thereby increasing the temperature of the cleaning fluid. The cleaning fluid pump 42 is used to pump the high-temperature cleaning fluid from the cleaning fluid tank 41 to the cleaning fluid spray head 43 for spraying. The bottom of the cleaning chamber 7 is provided with a chamber opening 12. The fluid sprayed from the circulating fluid spray head 32 and the cleaning fluid spray head 43 is collected at the bottom of the cleaning chamber 7 and discharged through the chamber opening 12. The chamber opening 12 is connected to a slag removal device 6, which is used to remove slag from the waste liquid discharged from the cleaning chamber 7. The outlet of the slag removal device 6 is connected to the liquid inlet 341 above the circulating fluid tank 34. The waste liquid removed by the slag removal device 6 enters the circulating fluid tank 34 for recycling.

[0034] In this embodiment, the cleaning fluid is liquid water or a mixture of water (e.g., a mixture of water and a drying agent, wherein the drying agent can accelerate the drying of the surface moisture of the object being cleaned 1). As those skilled in the art will appreciate, the cleaning fluid sprayed through the cleaning fluid spray head 43 after being heated to a high temperature can be liquid, or it can be gaseous water vapor, gas-liquid mixture steam, etc.

[0035] A drain pipe 33 is installed inside the circulating fluid tank 34. The lower end of the drain pipe 33 passes through and connects to the bottom plate of the circulating fluid tank 34, so that the drain pipe 33 is vertically positioned in the circulating fluid tank 34. The upper end of the drain pipe 33 is the drain inlet 331, and the lower end is the drain outlet 332. The position of the drain inlet 331 at the upper end of the drain pipe 33 is lower than the top of the circulating fluid tank 34. The circulating fluid in the circulating fluid tank 34 enters the drain pipe 33 through the drain inlet 331 and then exits through the drain outlet 332. Because the drain pipe 33 has a certain height, the liquid level of the fluid in the circulating fluid tank 34 can be maintained at a certain height, so that the fluid in the circulating fluid tank 34 maintains a certain volume without overflowing. The drain outlet 332 of the drain pipe 33 is connected to the waste liquid tank 11, which is provided with a waste liquid outlet 9 for discharging excess waste liquid in the waste liquid tank 11.

[0036] See Figure 1-2The steam heat recovery device 20 includes a heat exchange chamber 27, a first liquid inlet pipe 23, and a heat storage reflux pipe 24. The heat exchange chamber 27 includes a steam inlet 272 and a steam outlet 271. Preferably, the steam inlet 272 is located at the bottom of the heat exchange chamber 27, and the steam outlet 271 is located on the side of the heat exchange chamber 27. The steam inlet 272 is connected to the steam exhaust port provided at the top of the cleaning chamber 7. Steam in the cleaning chamber 7 enters the heat exchange chamber 27 through the steam exhaust port provided at the top of the cleaning chamber 7 and the steam inlet 272. Temperature and humidity sensors are installed inside the heat exchange chamber 27 to detect the steam temperature and humidity of the heat exchange chamber 27, thereby determining the steam filling status inside the heat exchange chamber 27.

[0037] The steam outlet 271 of the heat exchange chamber 27 is connected to a blower and drying assembly 50. Preferably, a filter device 14 is also provided between the blower and drying assembly 50 and the steam outlet 271 of the heat exchange chamber 27. The filter device 14 includes filter material and adsorbent material. The filter material of the filter device 14 can filter solid and liquid substances in the air, and the adsorbent material can absorb odors in the air. Since the steam heat recovery device 20 located before the filter device 14 can further condense most of the water vapor in the steam discharged into the heat exchange chamber 27 through the cleaning chamber 7 into the steam heat exchange tube 233, the workload of the filter device 14 is also reduced, so the filter device 14 does not need to be replaced frequently.

[0038] The blowing and drying assembly 50 includes a blowing duct 520 and a drying duct 530. The blowing duct 520 and the drying duct 530 share a common air inlet 510. The blowing duct 520 includes a first guide 521, a first fan 522, and an air outlet 523 connected in sequence. The first guide 521 allows gas to pass in one direction, preventing backflow. Gas that has been dehumidified and deodorized by the filter device 14 is pressurized by the first fan 522, blowing out relatively dry, clean gas, which is then discharged from the air outlet 523, thereby improving the cleaning effect on the cleaned item 1. Furthermore, the first fan 522 accelerates the rate at which steam enters the heat exchange chamber 27, thereby improving the efficiency of heat recovery. The steam, after heat recovery treatment, re-enters the cleaning chamber 7 via the first fan 522, not only effectively cleaning the cleaned item 1 but also allowing the steam to pass through the steam heat recovery device 20 again for further heat recovery, improving the utilization rate of heat energy in the steam. Furthermore, the steam that has undergone heat recovery is not discharged into the working environment, thus avoiding affecting the temperature and humidity of the working environment, and consequently avoiding affecting the comfort and hygiene of the working environment.

[0039] The drying duct 530 includes a dehumidifier 534, a heating device 535, a second guide 531, a second fan 532, and an annular duct 533 connected in sequence. The second guide 531 allows gas to pass through in one direction, preventing backflow. The dehumidifier 534 and the heating device 535 dehumidify and heat the flowing gas, respectively, to generate dry hot gas for drying the cleaned items 1. The heating device 535 is equipped with a temperature sensor to monitor the gas temperature flowing through it in real time, adjusting its operating status accordingly. The heating device 535 only activates when the second fan 532 is on, avoiding unnecessary energy waste from operating it alone. Preferably, the heating device 535 has a rapid heating function, quickly heating the flowing gas to reach the operating temperature. Once the operating temperature is reached, the heating device 535 can control its heating function based on the temperature information from the temperature sensor. An annular air duct 533 is arranged around the cleaning item 1 inside the cleaning chamber 7, and an annular opening is provided in the annular air duct 533 facing the center to blow out hot dry gas to dry the cleaning item 1. The arrangement of the drying air duct 530 can accelerate the drying speed of the cleaning item 1, improve the cleanliness of the cleaning item 1 and the working efficiency of the cleaning system. The hot and humid gas generated during drying can be returned to the chamber to participate in the heat recovery process, thereby increasing the amount of heat energy recovered, preventing the waste of heat energy generated during drying, and saving energy. The hot and humid gas generated during drying circulates between the cleaning chamber and the heat exchange chamber and is not discharged into the working environment, avoiding affecting the temperature and humidity of the working environment, and thus avoiding affecting the comfort and hygiene of the working environment.

[0040] The first fan 522 and the second fan 532 can be turned on or off respectively according to the system's operating mode. The cleaning system has different operating modes:

[0041] (1) Cleaning mode, i.e., the circulating fluid spray head 32 and the cleaning fluid spray head 43 are turned on, the first fan 522 is turned on, the second fan 532 is turned off, and the heating device 535 is turned off;

[0042] (2) Drying mode, i.e., the circulating fluid spray head 32 and the cleaning fluid spray head 43 are closed, the first fan 522 is closed, the second fan 532 is turned on, and the heating device 535 is turned off;

[0043] (3) Drying mode, i.e., the circulating fluid spray head 32 and the cleaning fluid spray head 43 are closed, the first fan 522 is closed, the second fan 532 is turned on, and the heating device 535 is turned on;

[0044] (4) Washing + drying mode, that is, both the circulating fluid spray head 32 and the cleaning fluid spray head 43 are turned on, both the first fan 522 and the second fan 532 are turned on, and the heating device 535 is turned off;

[0045] (5) Washing + Drying mode (this is the default working mode), that is, both the circulating fluid spray head 32 and the cleaning fluid spray head 43 are turned on, both the first fan 522 and the second fan 532 are turned on, and the heating device 535 is turned on.

[0046] The cleaning system is equipped with the above-mentioned different working modes, which enables the cleaning system to meet the different cleaning or quick-drying needs of users for the cleaning items, thereby making the cleaning system more versatile.

[0047] In addition, when the cleaning system is in standby mode, if the steam temperature and humidity detected by the temperature sensor and humidity sensor in the heat exchange box 27 are higher than a certain threshold, at least one of the first fan 522 and the second fan 532 will be turned on, thereby realizing heat recovery of the cleaning system in standby mode, as described below.

[0048] The cleaning fluid tank 41 is connected to a first inlet pipe 23, which is used to replenish the cleaning fluid in the cleaning fluid tank 41. The first inlet pipe 23 includes a first ambient temperature inlet pipe 231, an inlet tank 232, a steam heat exchange pipe 233, an inlet pump 234, a tee 235, and a first preheating inlet pipe 236 connected in sequence. The steam heat exchange pipe 233 passes through the heat exchange chamber 27. The steam heat exchange pipe 233 can exchange heat with the high-temperature steam in the heat exchange chamber 27, thereby preheating the cleaning fluid flowing through the first inlet pipe 23 using the high-temperature steam in the heat exchange chamber 27 and recovering the heat energy of the steam. Preferably, the steam heat exchange pipe 233 is bent inside the heat exchange chamber 27, thereby increasing the area of ​​heat exchange between the steam heat exchange pipe 233 and the steam and improving the heat recovery efficiency.

[0049] The bottom of the heat exchange box 27 is connected to a condensate drain pipe 28. The condensate drain outlet of the condensate drain pipe 28 is connected to the cleaning box 7. The condensate generated after recovering the heat energy of the steam can flow back to the circulating fluid box 34 through the box opening 12 of the cleaning box 7 for reuse.

[0050] The liquid inlet tank 232 is equipped with a replenishment inlet, a return inlet, and a supply outlet. A first ambient temperature liquid inlet pipe 231 is connected to the replenishment inlet of the liquid inlet tank 232. A first valve G1 is installed on the first ambient temperature liquid inlet pipe 231 to control its opening and closing. The first valve G1 is triggered to open the liquid inlet only when the fluid in the liquid inlet tank 232 is insufficient. The supply outlet of the liquid inlet tank 232 is connected to a steam heat exchange pipe 233. The outlet end of the steam heat exchange pipe 233 is connected to a liquid inlet pump 234. The outlet of the liquid inlet pump 234 is connected to the first end of a three-way valve 235, which divides the liquid into two liquid paths. The second end of the three-way valve 235 is connected to a heat storage return pipe 24. The heat storage return pipe 24 is connected to the return inlet of the liquid inlet tank 232, and a second valve G2 is installed on the heat storage return pipe 24. The second valve G2 is only opened when the liquid inlet tank 232 is not short of liquid. The third end of the tee 235 is connected to the first preheating inlet pipe 236, which is connected to the cleaning fluid tank 41. A third valve G3 is provided on the first preheating inlet pipe 236. The inlet pump 234 will only be turned on when at least one of the second valve G2 or the third valve G3 is open.

[0051] The inlet tank 232, steam heat exchange pipe 233, inlet pump 234, tee 235, and heat storage return pipe 24 constitute a heat storage circuit. When the cleaning system is in standby mode, when the steam temperature and humidity detected by the temperature and humidity sensors inside the heat exchange chamber 27 are higher than a certain threshold, at least one of the first fan 522 and the second fan 532 is turned on, and the second valve G2 and the inlet pump 234 are opened sequentially, and the heat storage circuit starts to operate. The fluid in the steam heat exchange pipe 233 begins to flow and exchanges heat with the high-temperature steam, causing the fluid to heat up. The heated fluid can flow back to the inlet tank 232. The fluid in the inlet tank 232 can continuously circulate and participate in heat exchange to heat up, so that the recovered heat can be stored in the inlet tank 232 and provided to the cleaning fluid tank 41 when needed. Even when the cleaning object 1 is not being cleaned, i.e. when the cleaning system is in standby mode, the heat storage circuit can still operate, and the heat recovery system can still operate. This enables heat recovery of the cleaning system in standby mode, and the heat recovery rate is significantly improved.

[0052] The cleaning fluid tank 41 is also connected to a second inlet pipe 13. The second inlet pipe 13 is also used to replenish the cleaning fluid in the cleaning fluid tank 41. A fourth valve G4 is installed on the second inlet pipe 13 to control the opening and closing of the second inlet pipe 13. The second inlet pipe 13 includes a second ambient temperature inlet pipe 132, a waste liquid heat exchange pipe 131, and a second preheating inlet pipe 133 connected in sequence. The second ambient temperature inlet pipe 132 is connected to an ambient temperature cleaning fluid source, and the second preheating inlet pipe 133 is connected to the cleaning fluid tank 41. The waste liquid heat exchange pipe 131 is installed inside the waste liquid tank 11. The waste liquid heat exchange pipe 131 can exchange heat with the waste liquid in the waste liquid tank 11, thereby utilizing the heat energy of the waste liquid in the waste liquid tank 11 to preheat the cleaning fluid flowing through the second inlet pipe 13 and recover the waste heat of the waste liquid in the waste liquid tank 11. Preferably, the waste liquid heat exchange tube 131 is bent inside the waste liquid tank 11, thereby increasing the area for heat exchange between the waste liquid heat exchange tube 131 and the waste liquid in the waste liquid tank 11, and improving the heat recovery efficiency.

[0053] When the cleaning fluid tank 41 is not lacking in cleaning fluid, both the third valve G3 and the fourth valve G4 are closed. Temperature sensors are installed on both the first inlet pipe 23 and the second inlet pipe 13 to detect the fluid temperature within them, respectively. When the fluid in the cleaning fluid tank 41 is insufficient, and the fluid temperature in the first inlet pipe 23 is higher, the third valve G3 is opened first; when the fluid in the cleaning fluid tank 41 is insufficient, and the fluid temperature in the second inlet pipe 13 is higher, the fourth valve G4 is opened first. By controlling the valve opening sequence, the utilization of recovered heat energy can be maximized, thereby improving the utilization rate of recovered heat energy. The temperature sensors can be connected in series in the pipes, attached to the pipe wall, or fixed to an assembly, which includes pipes and a fixing structure.

[0054] The steam entering the cleaning chamber 7 can have a temperature of 80-90°C. The cleaning fluid flowing into the first ambient temperature inlet pipe 231 can have a temperature of, for example, about 10°C. As the cleaning fluid flows through the steam heat exchange pipe 233 to the outlet and completes the heat exchange with the steam, the cleaning fluid can be heated to a temperature of, for example, about 50°C.

[0055] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A cleaning system with heat recovery, characterized in that, The system includes a cleaning chamber, a steam heat recovery device, and a blowing and drying assembly. The cleaning chamber allows for the cleaning and drying of items. Inside the cleaning chamber, in the order of item passage, are arranged a circulating fluid spray head, an air outlet, a cleaning fluid spray head, and an annular air duct. The steam heat recovery device includes a heat exchange chamber with a steam inlet and a steam outlet. Steam from the cleaning chamber enters the heat exchange chamber through the steam inlet. The steam heat recovery device recovers heat from the steam within the heat exchange chamber. The steam outlet is connected to the blowing and drying assembly, which includes a blowing duct and a drying duct. The blowing duct has the air outlet for blowing clean air onto the items in the cleaning chamber. The drying duct includes a dehumidifier, a heating device, and the annular air duct for blowing out hot, dry gas to dry the items. The cleaning system also includes a cleaning fluid tank, and the steam heat recovery device also includes a first liquid inlet pipe. The cleaning fluid tank is connected to the first liquid inlet pipe. The first liquid inlet pipe includes a steam heat exchange pipe. The steam heat exchange pipe passes through the heat exchange box and can exchange heat with the steam in the heat exchange box, thereby realizing heat recovery of the steam in the heat exchange box. The steam heat recovery device further includes a heat storage reflux pipe. The first liquid inlet pipeline further includes a first ambient temperature liquid inlet pipe, a liquid inlet tank, a liquid inlet pump, a tee, and a first preheating liquid inlet pipe. The liquid inlet tank is provided with a replenishment inlet, a reflux inlet, and a supply outlet. The first ambient temperature liquid inlet pipe is connected to the replenishment inlet of the liquid inlet tank. The supply outlet of the liquid inlet tank is connected to the steam heat exchange pipe. The outlet end of the steam heat exchange pipe is connected to the liquid inlet pump. The outlet of the liquid inlet pump is connected to the first end of the tee. The second end of the tee is connected to the heat storage reflux pipe. The heat storage reflux pipe is connected to the reflux inlet of the liquid inlet tank. The third end of the tee is connected to the first preheating liquid inlet pipe. The first preheating liquid inlet pipe is connected to the cleaning fluid tank. A valve is provided on the heat storage reflux pipe, and a valve is provided on the first preheating liquid inlet pipe.

2. The cleaning system with heat recovery according to claim 1, characterized in that: The blowing and drying components and the steam outlet also include a filter device. The blowing duct also includes a first guide and a first fan, with the first guide, the first fan and the blowing port connected in sequence. The drying duct is also provided with a second guide and a second fan, with the dehumidification device, the heating device, the second guide, the second fan and the annular duct connected in sequence.

3. The cleaning system with heat recovery according to claim 2, characterized in that: The first fan and the second fan can be turned on or off respectively according to the system's operating mode.

4. The cleaning system with heat recovery according to claim 1, characterized in that: The annular air duct is arranged around the cleaning object inside the cleaning machine box, and an annular opening is provided in the direction of the center of the annular air duct.

5. The cleaning system with heat recovery according to claim 1, characterized in that: The steam heat exchange tubes are bent and arranged inside the heat exchange box.

6. The cleaning system with heat recovery according to claim 1, characterized in that: The blowing duct also includes a first fan, and the drying duct also includes a second fan. The heat exchange box is equipped with a temperature sensor and a humidity sensor. When the steam temperature and humidity detected by the temperature sensor and humidity sensor in the heat exchange box are higher than a threshold, at least one of the first fan and the second fan is turned on, and the valve on the heat storage return pipe and the liquid inlet pump are turned on in sequence.

7. The cleaning system with heat recovery according to claim 1, characterized in that: The cleaning system also includes a waste liquid tank, and the cleaning fluid tank is connected to a second inlet pipe. A valve is installed on the second inlet pipe, and the second inlet pipe includes a waste liquid heat exchange pipe. The waste liquid heat exchange pipe passes through the waste liquid tank and can exchange heat with the waste liquid in the waste liquid tank. The waste liquid heat exchange pipe is bent inside the waste liquid tank.

8. The cleaning system with heat recovery according to claim 7, characterized in that: Both the first and second inlet pipes are equipped with temperature sensors to detect the fluid temperature in the first and second inlet pipes. When the fluid in the cleaning fluid tank is insufficient and the fluid temperature in the first inlet pipe is higher than that in the second inlet pipe, the valve on the first preheating inlet pipe in the first inlet pipe is opened first. When the fluid in the cleaning fluid tank is insufficient and the fluid temperature in the second inlet pipe is higher than that in the first inlet pipe, the valve on the second inlet pipe is opened first.

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