Combustion heater for commercial dish-washing machine and dish-washing machine

Abstract

The combustion heater comprises a heating box, a combustor, a smoke collecting box, a heating pipe and a smoke exhaust pipe, a heating cavity is formed in the heating box, the heating box is provided with a cold water inlet and a hot water outlet, the cold water inlet and the hot water outlet are both communicated with the heating cavity, and the combustor is fixedly arranged outside the heating box; the smoke collecting box is fixedly arranged on the heating box, and a smoke collecting cavity is formed in the smoke collecting box; the heating pipe is installed in the heating box, the heating pipe comprises one or more pipe body parts, a combustion cavity is formed in each pipe body part, a combustion opening is formed in one end of each pipe body part, each combustion opening is communicated with the combustor, a smoke exhaust opening is formed in the other end of each pipe body part, and each smoke exhaust opening is communicated with the smoke collecting cavity; all the pipe body parts are rectangular and are distributed at intervals, and the smoke exhaust pipe is installed outside the heating box and communicates with the smoke collecting cavity. The heating effect of the combustion heater is improved, and the heating time of the combustion heater for cold water is shortened.

Description

Technical Field

[0001] The present application relates to the field of dishwashers, and in particular to a combustion heater for commercial dishwashers. Background Art

[0002] Commercial dishwashers are equipment that automatically wash tableware such as bowls, chopsticks, plates, dishes, knives, forks, etc. Commercial dishwashers can be divided into pull-out dishwashers, tunnel dishwashers, and chain dishwashers. They are suitable for large, medium and small restaurants, hotels, government school canteens, industrial and mining enterprises, central kitchens, etc., and are now widely used; currently commercial dishwashers on the market generally include a cover, a dishwashing frame placement rack, a washing sink, and a heating module, wherein the heating module is used to heat the water temperature, and then spray the tableware to remove oil. The heating modules commonly used in dishwashers on the market generally use electric heaters or combustion heaters; traditional electric heaters have low thermal energy conversion efficiency, long heating time, and high energy consumption costs compared to gas and liquefied gas costs; at the same time, in many places, due to the limitation of capacitors, high-power commercial dishwashers cannot be used at all, so that the tableware can only be cleaned by hand washing, and modern cleaning equipment and tools cannot be used to reduce the workload of dishwashers and improve the cleanliness of tableware; this product can effectively solve the above problems.

[0003] The combustion heater used for dishwashers generally includes a heating box, a burner, a heating tube, a smoke collecting chamber and a smoke exhaust pipe. The heating tube and the smoke collecting chamber are placed in the heating box, and the burner and the smoke exhaust pipe are arranged outside the heating box. There are at least two heating tubes, each of which is provided with a combustion chamber. One end of the combustion chamber is opposite to the burner group, and the other end is connected with the smoke collecting chamber and the smoke exhaust pipe in sequence through the smoke exhaust hole. The burner is ignited and its open flame enters the combustion chamber of the heating tube for combustion and heating, thereby heating the cold water injected into the heating box and immersed in the heating tube.

[0004] With regard to the above-mentioned related technologies, the contact area between the heating tube and the cold water injected into the heating box and immersed in the heating tube is small, resulting in a small heat exchange area between the heating tube and the cold water, which in turn leads to low heating efficiency and long heating time of the combustion heater of the dishwasher. Summary of the invention

[0005] In order to increase the heating effect of the combustion heater and reduce the heating time of the combustion heater for cold water, the present application provides a combustion heater for a commercial dishwasher and a dishwasher.

[0006] The present application provides a combustion heater for a commercial dishwasher and a dishwasher using the following technical solutions:

[0007] A combustion heater for a commercial dishwasher comprises a heating box, a burner, a smoke collecting box, a heating pipe and a smoke exhaust pipe, wherein a heating cavity is provided inside the heating box, a cold water inlet and a hot water outlet are provided in the heating box, and the cold water inlet and the hot water outlet are both connected to the heating cavity, the burner is fixedly arranged outside the heating box, the smoke collecting box is fixedly arranged on the heating box, and the smoke collecting box is provided with a smoke collecting cavity;

[0008] The heating tube is installed inside the heating box, and the heating tube includes one or more tube bodies, each of which has a combustion chamber inside, one end of each of which has a combustion port, each of which is connected to the burner, and the other end of each of which has a smoke exhaust port, each of which is connected to the smoke collecting chamber;

[0009] Each of the tube bodies is rectangular, and each of the tube bodies is distributed at intervals. The smoke exhaust pipe is installed outside the heating box and is connected to the smoke collecting chamber.

[0010] By adopting the above technical scheme, when the combustion heater is working, cold water enters the heating chamber from the cold water inlet, the burner is ignited, and the open flame of the burner enters the combustion chamber of each tube body part respectively, and burns and heats respectively inside each combustion chamber, so that the tube wall of each tube body part is heated up to transfer heat to the water flowing around each tube body part and between each tube body part, so that the temperature of the cold water is increased. Each tube body part has a rectangular structural shape and is spaced apart, so that the contact area between the heating tube and the cold water contained in the heating chamber is larger, thereby making the heat exchange area between the heating tube and the cold water larger, so that the combustion heater has high heating efficiency for cold water and makes more effective use of the heat energy generated by gas combustion, thereby improving the problem that the contact area between the heating tube and the cold water injected into the heating box and immersed in the heating tube is small, resulting in a small heat exchange area between the heating tube and the cold water, which in turn leads to low heating efficiency and long heating time of the dishwasher's combustion heater.

[0011] Optionally, the size of the combustion port is larger than that of the smoke exhaust port, and the cross-sections of the combustion port and the smoke exhaust port are both rectangular.

[0012] By adopting the above technical solution, the size of the combustion port is larger than the size of the smoke exhaust port, so that when the open flame enters the combustion chamber, it is easier to cover the combustion chamber, so that the temperature of each tube body part rises more quickly and evenly, thereby improving the heating effect of the heating tube on cold water and making it more usable.

[0013] Optionally, the heating box includes a heating part and a water inlet, the water inlet is located on one side of the heating part, the heating part and the water inlet are connected, the cold water inlet is connected to the water inlet, the hot water outlet is connected to the heating part and is located at the bottom of the heating part, and the heating pipe is located in the heating part.

[0014] Optionally, an exhaust fan is further installed outside the smoke collecting box, the inlet end of the exhaust fan is connected to the smoke collecting chamber, the outlet end of the exhaust fan is connected to the exhaust pipe, and the exhaust fan is located at the bottom of the water inlet.

[0015] By adopting the above technical solution and setting up the exhaust fan, the smoke in the smoke collecting box can be quickly discharged, thereby increasing the air flow inside the combustion chamber, making the gas burn more completely in the combustion chamber, and at the same time helping to more evenly distribute the open flame generated by the burner in the combustion chamber, thereby achieving a better heating effect on the tube wall of each tube body part.

[0016] Optionally, the heating box is provided with a plurality of connecting grooves, each of the connecting grooves is connected to each combustion port respectively, and when the burner is installed in the heating box, each of the fire outlets of the burner is respectively penetrated through each of the connecting grooves.

[0017] Optionally, the heating box is fixedly provided with a plurality of positioning rods, and when the burner is installed in the heating box, each of the positioning rods is respectively passed through the burner.

[0018] Optionally, the thickness of the heating box is the same as the length of the burner.

[0019] Optionally, one or more connecting racks are fixedly connected to the bottom of the heating box.

[0020] Optionally, the heating box is provided with a steam port, and the steam port is communicated with the heating chamber.

[0021] By adopting the above technical solution and setting the steam port, when the combustion heater heats the cold water in the heating chamber, the water vapor generated by the heating of the cold water in the heating chamber flows out through the steam port, thereby keeping the internal pressure of the heating chamber always within a safe range, making it more usable.

[0022] Optionally, it further comprises a control circuit board, wherein the control circuit board comprises a power supply circuit (61), a control circuit (62), an ignition circuit (63), a temperature control circuit (64), a solenoid valve drive circuit (65) and a feedback circuit (66);

[0023] The power supply circuit (61) is respectively connected to the control circuit (62), the ignition circuit (63), the temperature control circuit (64), the solenoid valve drive circuit (65) and the feedback circuit (66); the control circuit (62) is respectively connected to the ignition circuit (63), the temperature control circuit (64), the solenoid valve drive circuit (65) and the feedback circuit (66); and the ignition circuit (63) is connected to the burner (3).

[0024] A commercial dishwasher comprises a housing and a combustion heater, wherein the combustion heater is arranged in the housing and is used to heat cold water;

[0025] The box is equipped with a steam pipe, one end of which is connected to the steam port of the combustion heater, and the other end of which is connected to the inside of the box, so as to heat and remove oil from the tableware inside the box.

[0026] By adopting the above technical solution and setting the steam pipe, the water vapor discharged from the steam port flows into the box through the steam pipe to heat and remove oil from the tableware, so that the water vapor discharged from the steam port can be reused by the dishwasher, thereby improving the usability.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. When the combustion heater is working, cold water enters the heating chamber from the cold water inlet, the burner is ignited, and the open flame of the burner enters the combustion chamber of each tube body part respectively, and burns and heats inside each combustion chamber respectively, so that the tube wall of each tube body part is heated up to transfer heat to the water flowing around each tube body part and between each tube body part, so that the temperature of the cold water is increased. Each tube body part has a rectangular structural shape and is spaced apart, so that the contact area between the heating tube and the cold water contained in the heating chamber is larger, thereby making the heat exchange area between the heating tube and the cold water larger, so that the combustion heater has high heating efficiency for cold water and makes more effective use of the heat energy generated by gas combustion, improving the contact area between the heating tube and the cold water injected into the heating box and immersed in the heating tube, resulting in a small heat exchange area between the heating tube and the cold water, which in turn leads to the problem of low heating efficiency and long heating time of the dishwasher's combustion heater.

[0029] 2. The size of the combustion port is larger than that of the smoke exhaust port, so that when the open flame enters the combustion chamber, it is easier to fill the combustion chamber, so that the temperature of each tube body rises more quickly and evenly, thereby improving the heating effect of the heating tube on the cold water and making it more usable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application;

[0031] Figure 2 This is a schematic diagram of the heating box structure of an embodiment of the present application;

[0032] Figure 3 This is a schematic diagram of the internal structure of the heating box in the embodiment of the present application. Figure 1 ;

[0033] Figure 4 This is a schematic diagram of the internal structure of the heating box in the embodiment of the present application. Figure 2 ;

[0034] Figure 5 This is a schematic diagram of the heating tube structure of an embodiment of the present application;

[0035] Figure 6 This is a schematic diagram of the structure of the tube body of an embodiment of the present application;

[0036] Figure 7 This is a schematic diagram of the structure of the connecting frame of an embodiment of the present application;

[0037] Figure 8 is a circuit schematic diagram of a power supply circuit according to an embodiment of the present application;

[0038] Fig. 9 is a circuit schematic diagram of a control circuit according to an embodiment of the present application;

[0039] Fig.10 is a circuit schematic diagram of an ignition circuit according to an embodiment of the present application;

[0040] Fig.11 is a circuit schematic diagram of a temperature control circuit according to an embodiment of the present application;

[0041] Fig.12 is a circuit schematic diagram of the solenoid valve drive circuit of the embodiment of the present application;

[0042] Fig.13 is a circuit schematic diagram of a feedback circuit in an embodiment of the present application;

[0043] Fig.14 is a circuit schematic diagram of the second control circuit of the embodiment of the present application;

[0044] Fig.15 This is a circuit diagram of the wind pressure detection circuit of the embodiment of the present application.

[0045] Fig.16 is a circuit schematic diagram of a buzzer circuit according to an embodiment of the present application;

[0046] Fig.17 This is a schematic diagram of the structure of a dishwasher.

[0047] Explanation of the reference numerals: 1. Heating box; 11. Heating part; 111. Heating chamber; 112. Hot water outlet; 113. Connecting groove; 114. Positioning rod; 115. Connecting frame; 116. Steam outlet; 117. Temperature probe port; 118. Water level port; 12. Water inlet; 121. Water inlet chamber; 122. Cold water inlet; 2. Heating pipe; 21. Pipe body; 211. Combustion port; 212. Smoke exhaust port; 3. Burner; 4. Smoke collecting box; 41. Exhaust fan; 5. Smoke exhaust pipe; 10. Box body; 101. Steam pipe; 20. Combustion heater; 61. Power supply circuit; 62. Control circuit; 63. Ignition circuit; 64. Temperature control circuit; 65. Solenoid valve drive circuit; 66. Feedback circuit; 67. Second control circuit; 68. Wind pressure detection circuit; 69. Buzzer circuit. DETAILED DESCRIPTION

[0048] The following is combined with Figure 1-17 This application is described in further detail.

[0049] The embodiment of the present application discloses a combustion heater for a commercial dishwasher and a dishwasher. Figure 1 A combustion heater for a commercial dishwasher comprises a heating box 1, a heating tube 2, a burner 3, a smoke collecting box 4 and a smoke exhaust pipe 5.

[0050] Reference Figure 2 , Figure 3 as well as Figure 4 The heating box 1 includes a heating part 11 and a water inlet part 12. The water inlet part 12 is located on one side of the heating part 11. A heating chamber 111 is opened inside the heating part 11, and a water inlet chamber 121 is opened inside the water inlet part 12. The water inlet chamber 121 is connected with the heating chamber 111. The heating part 11 and the water inlet part 12 are both rectangular. The heating part 11 and the water inlet part 12 have the same thickness direction dimensions. The length direction dimension of the heating part 11 is greater than the length direction dimension of the water inlet part 12. The width direction dimension of the heating part 11 is greater than the width direction dimension of the water inlet part 12. The top surface of the heating part 11 and the top surface of the water inlet part 12 are horizontally arranged. In the embodiment of the present application, the length direction of the heating part 11 is set as the X-axis direction, and the thickness direction of the heating part 11 is set as the Z-axis direction.

[0051] Reference Figure 2 , Figure 5 as well as Figure 6 The heating tube 2 is installed in the heating chamber 111. The heating tube 2 includes a plurality of tube bodies 21. A combustion chamber is opened inside each tube body 21. A combustion port 211 is opened at one end of each tube body 21. A smoke exhaust port 212 is opened at the other end of each tube body 21. Each tube body 21 is rectangular. The length direction of each tube body 21 is arranged along the X-axis direction. Each tube body 21 is spaced apart along the Z-axis direction. The size of the combustion port 211 is larger than the size of the smoke exhaust port 212. The cross-sections of the combustion port 211 and the smoke exhaust port 212 are both rectangular, so that when an open flame enters the combustion chamber, it is easier to fill the combustion chamber, so that the temperature of the tube body of each tube body 21 rises faster and more evenly, thereby improving the heating effect of the heating tube 2 on cold water.

[0052] Reference Figure 3 and Figure 4Two cold water inlets 122 are arranged through the top of the water inlet part 12, and the two cold water inlets 122 are distributed along the Z-axis direction. The two cold water inlets 122 are connected with the water inlet cavity 121, so that when the water to be heated enters the heating box 1, it first enters the water inlet cavity 121 and then enters the heating cavity 111, so that the impact force of the water flowing into the heating cavity 111 is eliminated by the water inlet cavity 121, and a hot water outlet 112 is arranged through the bottom of the heating part 11, and the hot water outlet 112 is connected with the heating cavity 111 and is used to connect with the rinsing pump of the dishwasher, so that the water to be heated needs to pass through the heating tube 2 during the process from the cold water inlet 122 flowing into the heating box 1 to flowing out from the hot water outlet 112, so that the combustion heater has the ability to simultaneously take in and out water and heat the water entering the heating box 1.

[0053] Reference Figure 1 and Figure 7 The burner 3 is installed at the bottom of the heating part 11. In the embodiment of the present application, the burner 3 is a standard part. The heating part 11 is provided with a plurality of connecting grooves 113, each connecting groove 113 is connected to each combustion port 211 respectively. When the burner 3 is installed in the heating box 1, each fire outlet of the burner 3 is respectively penetrated through each connecting groove 113, so that when the burner 3 is ignited and burned, the connection position between each fire outlet of the burner 3 and each combustion port 211 is respectively sealed by the groove body of each connecting groove 113, so that when the burner 3 is ignited, the flame of the burner 3 is not easy to spray out from the connection position between each fire outlet and each combustion port 211. The heating box 1 is fixedly provided with a plurality of positioning rods 114. When the burner 3 is installed in the heating box 1, each positioning rod 114 is respectively penetrated through the burner 3, and the thickness dimension of the heating box 1 is the same as the length dimension of the burner 3.

[0054] Reference Figure 1 and Figure 7 The smoke collecting box 4 is installed at the bottom of the heating part 11, and a smoke collecting cavity is opened inside the smoke collecting box 4, which is connected with each smoke exhaust port 212. An exhaust fan 41 is installed outside the smoke collecting box 4, and the exhaust fan 41 is located at the bottom of the water inlet part 12, so that the exhaust fan 41 is protected by the water inlet part 12, and the inlet end of the exhaust fan 41 is connected with the smoke collecting cavity, and the outlet end of the exhaust fan 41 is connected with the exhaust pipe, so that the smoke in the smoke collecting box 4 is quickly discharged, thereby increasing the circulation of the air inside the combustion chamber, making the gas burn more fully in the combustion chamber, and at the same time helping to more easily and evenly distribute the open flame generated by the burner 3 in the combustion chamber, so that the temperature rise effect of the tube wall of each tube body part 21 is better.

[0055] Reference Figure 1 and Figure 7 Two connecting frames 115 are fixedly connected to the bottom of the heating box 1. The two connecting frames 115 are located between the burner 3 and the smoke collecting box 4, so as to support the combustion heater.

[0056] Reference Figure 3 Two steam ports 116 are provided on the top of the heating portion 11 and are distributed along the Z-axis direction. Both steam ports 116 are connected to the heating chamber 111, so that when the combustion heater heats the cold water in the heating chamber 111, the water vapor generated by the heating of the cold water in the heating chamber 111 flows out through the steam ports 116, thereby keeping the internal pressure of the heating chamber 111 always within a safe range.

[0057] In the embodiment of the present application, the two steam ports 116 and the two cold water inlets 122 are both provided with internal threads. The purpose of providing two steam ports 116 and two cold water inlets 122 is that different dishwashers have different internal structures. According to their structural requirements, one of the steam ports 116 or the cold water inlets 122 is selected for connection and use. The other steam port 116 or the cold water inlet 122 is sealed by a sealing joint, which is convenient for adding a descaling agent when the interior of the combustion heater is subsequently cleaned. The setting of the internal threads of the steam port 116 and the cold water inlet 122 makes the connection more airtight and is more convenient and quick to connect to the dishwasher.

[0058] Reference Figure 2 One side of the heating portion 11 is provided with three through-set temperature detection ports 117, each of which is used to install a temperature detector. One temperature detection port 117 is used to detect the temperature of the combustion heater itself, and the other two temperature detection ports 117 are used for temperature detection of the dishwasher. One side of the heating portion 11 is provided with a through-set water level port 118, which is used to install a water level detector for detecting the water level height in the heating chamber 111, thereby preventing the water level in the heating chamber 111 from being too low, causing the heating tube 2 to dry burn.

[0059] The implementation principle of a combustion heater for a commercial dishwasher in the embodiment of the present application is as follows: when the combustion heater is working, cold water enters the heating chamber 111 from the cold water inlet 122, the burner 3 is ignited, and the open flame of the burner 3 enters the combustion chamber of each tube body 21 respectively, and burns and heats inside each combustion chamber respectively, so that the wall of each tube body 21 is heated up to conduct heat to the water flowing around each tube body 21 and between each tube body 21, so that the temperature of the cold water is increased. Each tube body 21 has a rectangular structural shape and The tube bodies 21 are distributed at intervals, so that the contact area between the heating tube 2 and the cold water contained in the heating chamber 111 is larger, thereby making the heat exchange area between the heating tube 2 and the cold water larger, so that the combustion heater has high heating efficiency for the cold water and more effective use of the heat energy generated by the gas combustion, thereby improving the contact area between the heating tube 2 and the cold water injected into the heating box 1 and immersed in the heating tube 2, resulting in a small heat exchange area between the heating tube 2 and the cold water, which in turn leads to the problem of low heating efficiency and long heating time of the combustion heater of the dishwasher.

[0060] The temperature detector is used to detect the temperature of the combustion heater itself and detect the change of water temperature. When the water temperature in the heater is lower than the preset threshold temperature, the heater is controlled to work. After heating to the threshold temperature, the heating is stopped, and the change of water temperature is monitored in real time. Once it is lower than the preset threshold temperature, the heating is started. That is, the combustion heater device is also provided with a control circuit board, which is used for the combustion heater to control the water temperature itself and determine whether it needs to be heated to the threshold.

[0061] The control circuit board is also used to control the water temperature of the dishwasher and to control whether water needs to be drawn. If the temperature detector detects that the water temperature in the combustion heater has not reached the threshold, the dishwasher is not allowed to draw water, and instructions are continued to be issued to allow the combustion heater to continue heating. That is, dual control boards are used for independent control to ensure accurate and orderly control.

[0062] More specifically, if Figure 8-Figure 13 The combustion heater of the embodiment of the present application also includes a control circuit board, which includes a power supply circuit 61, a control circuit 62, an ignition circuit 63, a temperature control circuit 64, a solenoid valve drive circuit 65 and a feedback circuit 66.

[0063] The power supply circuit 61 is respectively connected to the control circuit 62, the ignition circuit 63, the temperature control circuit 64, the solenoid valve drive circuit 65, the feedback circuit 66 and the connector 67 to provide the voltage required by each circuit. The control circuit 62 is respectively connected to the ignition circuit 63, the temperature control circuit 64, the solenoid valve drive circuit 65 and the feedback circuit 66, and the ignition circuit 63 is connected to the burner 3.

[0064] Figure 8 The schematic diagram of the power supply circuit 61 is shown in FIG. 1 . The connection relationship of each component in the circuit can be referred to as Figure 8 We will not go into detail here. Figure 8 As shown, the power supply circuit 61 has a socket JP6, which is connected to an external power supply such as the mains through the socket JP6, so as to input a 220V AC voltage. The 220V AC voltage is transmitted to the rectifier ZL1 through the inductor L4, and is rectified by the rectifier ZL1 to become a DC voltage, and then outputs a working voltage +24V through the action of the transformer T2, and outputs a working voltage +12V through the chip U2 and the optocoupler chip U7. The working voltage +12V is stepped down by the chip IC1 to output the working voltage VCC.

[0065] like Fig. 9 As shown, the control circuit 62 includes a chip U1, a resistor R40, a diode D3, a capacitor C21, a capacitor C22, a capacitor C16 and a capacitor C34. The connection relationship of each component can be referred to Fig. 9, the chip U1 can be a single chip microcomputer. The chip U1 is connected to other circuits through various pins, wherein the 3rd pin of the chip U1 is connected to the working voltage VCC output by the power supply circuit 61, so as to obtain the voltage required for the work. The resistor R40, the diode D3 and the capacitor C34 constitute a reset circuit, which is connected to the 29th pin of the chip U1 and is used to receive the reset signal RST of the chip U1. The capacitors C21, C22 and C16 constitute a filter circuit, which is used to filter the working voltage VCC.

[0066] like Fig.10 As shown, the resistor R37 in the ignition circuit 63 is connected to the 30 pin of the chip U1, and the 30 pin of the chip U1 outputs the DIANHUO signal. The DH1 terminal and the DH2 terminal of the ignition circuit 63 are respectively connected to the positive and negative electrodes of the ignition pin of the burner 3, so that under the control of the DIANHUO signal, the burner 3 is controlled to emit a flame through the ignition circuit 63. The connection terminal GY of the ignition circuit 63 is connected to the flame sensing line, so as to connect the flame detector through the flame sensing line. The flame detector is used to detect whether the burner 3 generates a flame, that is, to sense a flame signal, so as to transmit the detection result to the ignition circuit 63 through the flame sensing line. The output terminal of the comparator U8B of the ignition circuit 63 is connected to the 31 pin of the chip U1, and is used to output a flame signal FIERY to the chip U1 according to the detection result of the flame detector.

[0067] like Fig.11 As shown, the temperature control circuit 64 includes three sub-circuits, and the three sub-circuits are respectively connected to three temperature detectors. The three temperature detectors respectively output three temperature signals, which are temperature signal NTC21, temperature signal NTC31 and temperature signal NTC41. The three temperature signals NTC21, NTC31 and NTC41 are processed by the three sub-circuits to obtain temperature signal NTC2, temperature signal NTC3 and temperature signal NTC4. The three temperature signals NTC2, temperature signal NTC3 and temperature signal NTC4 are respectively transmitted to pin 21, pin 20 and pin 22 of the chip U1, so that the chip U1 controls the operation of the burner 3 according to these temperature signals.

[0068] like Fig.12As shown, the solenoid valve driving circuit 65 is connected to the solenoid valve through the connection socket JP1. The solenoid valve is used to control the flow of gas, and the solenoid valve is driven by the solenoid valve driving circuit 65. The solenoid valve driving circuit 65 is a two-way input and two-way output circuit, wherein the resistor R65 is connected to the 7-pin of the chip U1, receives the BILICNC4 signal from the chip U1, under the action of the BILICNC4 signal, the solenoid valve driving circuit 65 outputs the BILICNC4OUT signal through the collector of the transistor Q4, and the BILICNC4OUT signal is transmitted to the solenoid valve through the connection socket JP1; the resistor R62 is connected to the 5-pin of the chip U1, receives the BILICNC3 signal from the chip U1, under the action of the BILICNC3 signal, the solenoid valve driving circuit 65 outputs the 95IN_GND signal through the collector of the transistor Q3, and the 95IN_GND signal is output to the solenoid valve through the connection socket JP1.

[0069] like Fig.13 As shown, the resistor R21 of the feedback circuit 66 is connected to the 8-pin of the chip U1 for receiving the BILIPWM signal from the chip U1, and the resistor R16 is connected to the solenoid valve for receiving the BILIFANGKUI feedback signal. Under the control of the BILIPWM signal, the comparator U8A, the transistor Q1, and the transistor Q8 process the BILIFANGKUI feedback signal to obtain the signal BILI, and output the signal BILI to the solenoid valve to control the opening of the solenoid valve, thereby controlling the flow of the gas.

[0070] like Fig.14The control circuit board also includes a second control circuit 67 for controlling the exhaust fan 41 and the water pump. In the second control circuit 67, the 1st and 4th pins of the connector JP4 are connected to the switch of the exhaust fan 41, the 2nd and 3rd pins of the connector JP4 are connected to the switch of the water pump, and the connector JP5 is connected to the switch of the dishwasher. The 1st and 2nd pins of the chip U3 are respectively connected to the 17th and 18th pins of the chip U1, so as to respectively receive the FENJICNC signal and the SHUIBENCNC signal from the chip U1, and the chip U3 outputs the FENJ signal and the SHUIB signal through the 8th and 7th pins, respectively. Among them, the FENJ signal is transmitted to the input end of the relay K1 to control the closing or disconnection of the relay K1. When the relay K1 is closed, an output end of the relay K1 outputs a 220VFENG signal to the 1st pin of the connector JP4, thereby controlling the closing of the switch of the exhaust fan 41, thereby controlling the operation of the exhaust fan 41; when the FENJ signal controls the relay K1 to disconnect, the exhaust fan 41 can be stopped accordingly. Similarly, the SHUIB signal is transmitted to the input end of relay K4 to control the closing or opening of relay K4. When relay K4 is closed, an output end of relay K4 outputs a PUMP signal to pin 2 of connector JP4, thereby controlling the closing of the water pump switch to make the water pump work; when the PIMP signal controls relay K4 to open, the water pump stops working accordingly.

[0071] like Fig.15 As shown, the control circuit board also includes a wind pressure detection circuit 68, wherein the connection node of the resistor R3 and the capacitor C2 is connected to the fan pressure sensor, and the fan pressure sensor is used to detect the wind pressure of the exhaust fan 41 and transmit the detected signal to the wind pressure detection circuit 68, so that the wind pressure detection circuit 68 outputs a WINDPRESSURE wind pressure signal to the 15th pin of the chip U1.

[0072] like Fig.16 As shown, the control circuit board also includes a buzzer circuit 69, which is connected to the 10th pin of the chip U1 through a resistor R43, and is used to receive a buzzer control signal BUZZER from the chip U1 to control the operation of the buzzer BZ1. When the combustion heater fails, the chip U1 is used to control the buzzer BZ1 to sound an alarm. Different fault alarm sounds may be different. For example, the buzzer BZ1 may sound three times for an over-temperature fault, and once for an ignition failure fault. The specific settings may be made according to actual needs.

[0073] During each startup of the combustion heater, the control circuit board will detect the flame signal, wind pressure signal and overheat protection signal. If there is no fault, the solenoid valve drive circuit 65 will control the solenoid valve to open to pass the gas, and at the same time control the ignition circuit 63 to work so that the ignition needle of the burner 3 will ignite. In order to better detect the flame signal, the output of the ignition circuit 63 is stopped within the last 2 seconds of the safety time, and the solenoid valve still maintains the output, that is, the solenoid valve is in the open state. If the flame signal is detected for 2 consecutive seconds, it will switch to the combustion state, otherwise the control circuit board will remain in the standby state.

[0074] If no flame signal is detected at the end of the safe ignition time, the re-ignition procedure is entered to wait for the next ignition. If three consecutive ignitions are unsuccessful, the combustion heater enters the shutdown lock state, and the exhaust fan 41 circulates for 20S after the shutdown lock state and then stops working.

[0075] When the flame is detected by the flame detector, the electromagnetic valve is kept open. The exhaust fan 41 is controlled to rotate normally by the second control circuit 67. When no flame is detected, no water flow signal or a fault is detected, the electromagnetic valve is closed.

[0076] During combustion operation, if the flame is detected to be extinguished, that is, no flame signal is detected, the solenoid valve is controlled to close within 1 second, and an attempt is made to control the ignition circuit 63 to ignite again. If the ignition fails 5 times (that is, no flame signal is detected), an ignition failure fault is reported.

[0077] If a flame signal is detected when the combustion heater is in standby mode or during ignition startup, the next step will not be performed (i.e., the burner 3 will not be ignited and the solenoid valve will not be opened), and a false fire fault will be reported. The detection time of the false fire fault is 6 seconds.

[0078] After the burner 3 finishes combustion, the exhaust fan 41 is controlled to operate in a post-cycle for 5S after the combustion is finished, and then stops operating.

[0079] In addition, when any of the three temperature detectors reaches the upper operating temperature limit of 104°C, the control circuit board enters a safety shutdown state until the temperature drops below the safe temperature.

[0080] Reference Fig.17The embodiment of the present application also provides a commercial dishwasher including a cabinet 10, a cleaning mechanism and a combustion heater 20. The cleaning mechanism is arranged in the cabinet 10 and is used to clean tableware. The combustion heater 20 is arranged in the cabinet 10 and is used to heat cold water. The cabinet 10 is equipped with a steam pipe 101. One end of the steam pipe 101 is connected to the steam port 116 of the combustion heater 20, and the other end of the steam pipe 101 is connected to the inside of the cabinet 10 to heat and degrease the tableware inside the cabinet 10, so that the water vapor discharged from the steam port 116 flows into the cabinet 10 through the steam pipe 101 to heat and degrease the tableware, so that the water vapor discharged from the steam port 116 is reused by the dishwasher.

[0081] In addition, gas heats up quickly and can reach the required high temperature in a short time. Compared with electricity consumption, the cost of using gas is usually lower. Especially when used on a large scale, it is more suitable for work needs during peak hours and can quickly process large quantities of tableware.

[0082] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A combustion heater for commercial dishwasher, characterized in that: The invention comprises a heating box (1), a burner (3), a smoke collecting box (4), a heating pipe (2) and a smoke exhaust pipe (5); a heating chamber (111) is provided inside the heating box (1); a cold water inlet (122) and a hot water outlet (112) are provided on the heating box (1); the cold water inlet (122) and the hot water outlet (112) are both connected to the heating chamber (111); the burner (3) is fixedly arranged outside the heating box (1); the smoke collecting box (4) is fixedly arranged on the heating box (1); and the smoke collecting box (4) is provided with a smoke collecting chamber; The heating tube (2) is installed inside the heating box (1), and the heating tube (2) comprises one or more tube bodies (21), each of which has a combustion chamber inside, and each of which has a combustion port (211) at one end, each of which is connected to the burner (3), and each of which has a smoke exhaust port (212) at the other end, each of which is connected to the smoke collecting chamber; Each of the tube bodies (21) is rectangular, and each of the tube bodies (21) is spaced apart. The smoke exhaust pipe (5) is installed outside the heating box (1) and is in communication with the smoke collecting chamber.

2. A combustion heater for commercial dishwasher according to claim 1, characterized in that: The size of the combustion port (211) is larger than the size of the smoke exhaust port (212), and the cross-sections of the combustion port (211) and the smoke exhaust port (212) are both rectangular.

3. A combustion heater for commercial dishwasher according to claim 1, characterized in that: The heating box (1) comprises a heating part (11) and a water inlet part (12), wherein the water inlet part (12) is located on one side of the heating part (11), the heating part (11) and the water inlet part (12) are connected, the cold water inlet (122) is connected to the water inlet part (12), the hot water outlet (112) is connected to the heating part (11) and is located at the bottom of the heating part (11), and the heating pipe (2) is located in the heating part (11).

4. A combustion heater for commercial dishwasher according to claim 3, characterized in that: An exhaust fan (41) is also installed outside the smoke collection box (4), the inlet end of the exhaust fan (41) is connected to the smoke collection chamber, the outlet end of the exhaust fan (41) is connected to the exhaust pipe, and the exhaust fan (41) is located at the bottom of the water inlet part (12).

5. The combustion heater for commercial dishwasher according to claim 1, characterized in that: The heating box (1) is provided with a plurality of connection grooves (113), each of the connection grooves (113) being connected to each of the combustion ports (211). When the burner (3) is installed in the heating box (1), each of the fire outlets of the burner (3) is respectively penetrated through each of the connection grooves (113).

6. A combustion heater for commercial dishwasher according to claim 4, characterized in that: The heating box (1) is fixedly provided with a plurality of positioning rods (114); when the burner (3) is installed on the heating box (1), each of the positioning rods (114) is respectively penetrated through the burner (3).

7. The combustion heater for commercial dishwasher according to claim 1, characterized in that: The thickness of the heating box (1) is the same as the length of the burner (3); One or more connecting frames (115) are fixedly connected to the bottom of the heating box (1).

8. The combustion heater for commercial dishwasher according to claim 1, characterized in that: The heating box (1) is provided with a steam port (116), and the steam port (116) is in communication with the heating chamber (111).

9. The combustion heater for commercial dishwasher according to claim 1, characterized in that: It also includes a control circuit board, which includes a power supply circuit (61), a control circuit (62), an ignition circuit (63), a temperature control circuit (64), a solenoid valve drive circuit (65) and a feedback circuit (66); The power supply circuit (61) is respectively connected to the control circuit (62), the ignition circuit (63), the temperature control circuit (64), the solenoid valve drive circuit (65) and the feedback circuit (66); the control circuit (62) is respectively connected to the ignition circuit (63), the temperature control circuit (64), the solenoid valve drive circuit (65) and the feedback circuit (66); and the ignition circuit (63) is connected to the burner (3).

10. A commercial dishwasher according to any one of claims 1 to 9, characterized in that It comprises a box (10) and a combustion heater (20), wherein the combustion heater (20) is arranged in the box (10) and is used to heat cold water; The box (10) is equipped with a steam pipe (101), one end of the steam pipe (101) is connected to the steam port (116) of the combustion heater (20), and the other end of the steam pipe (101) is connected to the inside of the box (10), so as to heat and remove oil from the tableware inside the box (10).

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