Fuel gas system and household dishwasher using fuel gas as single energy

Abstract

The invention discloses a fuel gas system and a household dishwasher with fuel gas as single energy, and relates to the technical field of household appliances, the fuel gas system comprises a fuel gas generator, a heat exchanger, a storage battery and a control unit, the fuel gas generator comprises an engine and a generator in power connection with the engine, and a waste gas outlet of the engine communicates with the heat exchanger; the heat exchanger comprises a box body and a plurality of heat exchange pipes, an inner cavity of the box body communicates with a waste gas pipe of the engine, the heat exchange pipes communicate with a water storage tank, water in the water storage tank flows in the heat exchange pipes, waste gas flows in the inner cavity of the box body when the engine runs, water in the water storage tank is heated, and the water heating efficiency can be effectively improved; the electric generator is electrically connected to the storage battery, the control unit can supply electric energy of the storage battery to all electric equipment, an external power source is not needed, the dishwasher can be flexibly used outdoors, and use convenience is improved.

Description

Technical Field

[0001] The invention relates to the technical field of household appliances, and in particular to a gas system and a household dishwasher using gas as a single energy source. Background Art

[0002] Outdoor camping or barbecue is becoming an outdoor activity that more and more people like. After eating, the dishes need to be washed. However, it is difficult to wash dishes outdoors or even in the wild. Most of the current household dishwashers use electricity, which is difficult to connect to the power supply when used outdoors, resulting in limited usage scenarios of dishwashers and unable to solve the need for outdoor dishwashing. On the other hand, the water heating efficiency of electric-heated dishwashers is insufficient, and the washing time is long, resulting in a poor user experience. Summary of the invention The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a gas system and a household dishwasher using gas as a single energy source, which can improve the convenience of use and work efficiency.

[0003] A gas system according to an embodiment of the first aspect of the present invention comprises: A gas generator, a heat exchanger, a battery and a control unit. The gas generator includes an engine and a generator connected to the engine. The exhaust gas outlet of the engine is connected to a heat exchanger. The heat exchanger includes a box and a plurality of heat exchange pipes. The inner cavity of the box is connected to the exhaust gas pipe of the engine. The heat exchange pipes are connected to a water tank. The water in the water tank flows through the heat exchange pipes. When the engine is running, the exhaust gas flows through the inner cavity of the box to heat the water in the water tank. The generator is electrically connected to the battery. The control unit can supply the power of the battery to various electrical devices.

[0004] The gas system according to the embodiment of the first aspect of the present invention has at least the following beneficial effects: the present embodiment is provided with a gas generator, a heat exchanger, a battery and a control unit, the gas generator includes an engine and a generator connected to the power thereof, the exhaust gas outlet of the engine is connected to the heat exchanger, the heat exchanger includes a box body and a plurality of heat exchange pipes, the inner cavity of the box body is connected to the exhaust gas pipe of the engine, the heat exchange pipes are connected to a water tank, the water in the water tank flows through the heat exchange pipes, the exhaust gas when the engine is running flows through the inner cavity of the box body, so as to heat the water in the water tank, which can effectively improve the efficiency of water heating, thereby improving the working efficiency of the dishwasher, the generator is electrically connected to the battery, the control unit can supply the electric energy of the battery to various electrical devices, no external power supply is required, it can be flexibly used outdoors, and the convenience of use is improved.

[0005] According to an embodiment of the first aspect of the present invention, a water inlet pipe and a water outlet pipe connected to the heat exchange tube are provided on both sides of the box body along the length direction, and an air inlet pipe and an air outlet pipe connected to the inner cavity are provided on both sides of the box body along the width direction, and the flow direction of the exhaust gas in the box body is perpendicular to the direction of the water flow in the heat exchange tube.

[0006] According to an embodiment of the first aspect of the present invention, the heat exchange tube is provided with a plurality of fins extending in its radial direction, and a channel allowing airflow to pass therethrough is provided between two adjacent fins, wherein the channel is perpendicular to the direction of water flow in the heat exchange tube.

[0007] According to an embodiment of the first aspect of the present invention, the fin includes a windward portion and an extended portion, the extended portion is located on a side of the heat exchange tube facing away from the air inlet pipe, and the extended portion extends outward in a direction perpendicular to the axis of the heat exchange tube.

[0008] According to an embodiment of the first aspect of the present invention, connecting parts are provided on both sides of the box body, and the connecting parts connect two adjacent heat exchange tubes at the same time.

[0009] According to an embodiment of the first aspect of the present invention, a plurality of heat exchange tubes are arranged at intervals along the height direction of the box body, and the water flow directions between two adjacent heat exchange tubes are opposite.

[0010] According to an embodiment of the first aspect of the present invention, the heat exchange tube has an elliptical cross-sectional shape, and an extending direction of a major axis in the cross-section of the heat exchange tube is parallel to an extending direction of the extended portion.

[0011] According to an embodiment of the first aspect of the present invention, the fin has a plurality of connection holes arranged at intervals, the heat exchange tube is passed through the connection holes, and the inner wall of the connection hole abuts against the outer wall of the heat exchange tube.

[0012] According to an embodiment of the first aspect of the present invention, the box body includes a bracket and a guide cover, the bracket is used to install the heat exchange tube, the guide cover is located on both sides of the bracket, and the guide cover on both sides of the bracket is respectively provided with an air inlet pipe and an air outlet pipe.

[0013] According to an embodiment of the second aspect of the present invention, there is provided a household dishwasher using gas as a single energy source, comprising the above-mentioned gas system.

[0014] The household dishwasher using gas as the sole energy source according to the second aspect of the present invention has at least the following beneficial effects: Compared with the prior art, a household dishwasher that uses gas as the sole energy source has a gas system, which includes a gas generator, a heat exchanger, a battery and a control unit. The exhaust gas outlet of the gas generator is connected to the heat exchanger, which includes a box body and a plurality of heat exchange pipes. The inner cavity of the box body is connected to the exhaust gas pipe of the engine. The heat exchange pipes are connected to a water tank. The water in the water tank flows through the heat exchange pipes. When the engine is running, the exhaust gas flows through the inner cavity of the box body to heat the water in the water tank. This can effectively improve the efficiency of water heating, thereby improving the working efficiency of the dishwasher. The generator is electrically connected to the battery, and the control unit can supply the power of the battery to various electrical devices. No external power supply is required, and it can be flexibly used outdoors, thereby improving convenience.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 A block diagram of a gas system in an embodiment of the first aspect of the present invention; Figure 2 It is an axonometric view of a heat exchanger in an embodiment of the first aspect of the present invention; Figure 3 A top view of a heat exchanger in an embodiment of the first aspect of the present invention; Figure 4 It is a schematic diagram of the fin in the embodiment of the first aspect of the present invention.

[0017] Reference numerals: Gas system 100; gas generator 101; battery 102; power converter 103; controller unit 104; power equipment 105; water tank 106; Heat exchanger 110; housing 111; bracket 112; air deflector 113; air inlet pipe 114; air outlet pipe 115; heat exchange pipe 116; connecting portion 117; inner cavity 118; water inlet pipe 119; water outlet pipe 120; fin 121; windward portion 122; extension portion 123; connecting hole 124; first recess 125; second recess 126. DETAILED DESCRIPTION

[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0019] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0021] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0022] Reference Figure 1 In the first aspect of the present invention, a gas system includes a gas generator 101, a heat exchanger 110, a battery 102 and a control unit. The gas generator 101 includes an engine and a generator connected to the engine. It is understood that the engine can use natural gas or liquefied petroleum gas as fuel. The exhaust gas outlet of the engine is connected to the heat exchanger 110. The heat exchanger 110 includes a box 111 and a plurality of heat exchange pipes 116. The inner cavity 118 of the box 111 is connected to the exhaust gas pipe of the engine. The heat exchange pipe 116 is connected to the water storage tank 106. The water in the water storage tank 106 flows through the heat exchange pipe 116. The exhaust gas when the engine is running flows through the inner cavity 118 of the box 111 to heat the water in the water storage tank 106, which can effectively improve the efficiency of water heating, thereby improving the working efficiency of the dishwasher. It is understood that the engine has a starter electrically connected to the battery 102. When power generation or heating is required, the control unit can control the starter to start the engine, thereby realizing the function of self-generating electricity or heating water, or both at the same time. It can be understood that the control unit is connected to the battery 102, so that electrical energy can be transmitted to various electrical devices 105, including water temperature sensors, dishwashing devices, circulating water pumps, water valves, door lock devices, drain valves, drain pumps, fans and garbage disposals.

[0023] It is understandable that the exhaust gas temperature when the engine is working can reach hundreds of degrees Celsius, which is higher than the heating efficiency of traditional electric heating devices. Therefore, the use of a heat exchanger 110 connected to the exhaust gas can significantly improve the water heating efficiency, thereby shortening the dishwashing time. The dishwashers currently on the market that use gas combustion for direct heating cannot generate electricity through gas, and require additional batteries or external power supplies. The batteries also need to be charged regularly. In contrast, the gas generator 101 used in the embodiment of the present application can both heat water through exhaust gas and generate electricity automatically. No external power supply is required when used outdoors, and the flexibility of use is good.

[0024] Reference Figure 2 and Figure 3It can be understood that the box body 111 includes a bracket 112 and a fairing 113. A heat exchange tube 116 is installed inside the bracket 112. The heat exchange tube 116 extends along the length direction of the box body 111. The fairing 113 is located on both sides of the bracket 112, and an air inlet pipe 114 and an air outlet pipe 115 are respectively provided on the fairing 113 on both sides of the bracket 112. A water inlet pipe 119 and a water outlet pipe 120 connected to the heat exchange tube 116 are provided on both sides of the box body 111 along the length direction. An air inlet pipe 114 and an air outlet pipe 115 connected to the inner cavity 118 are respectively provided on both sides of the box body 111 along the width direction. The flow direction of the exhaust gas in the box body 111 is perpendicular to the direction of the water flow in the heat exchange tube 116. The water flows along the length direction of the heat exchange tube 116, which can increase the contact area between the exhaust gas discharged from the engine and the heat exchange tube 116, thereby achieving a good heat exchange effect to improve the heating efficiency. It is understandable that since the transfer of heat requires a certain contact time, if the flow direction of the exhaust gas and the axial direction of the heat exchange tube 116 have an angle less than 90°, the side exhaust gas will flow quickly through the outer wall of the heat exchange tube 116, resulting in the heat of the exhaust gas not being well transferred to the heat exchange tube 116, thereby resulting in insufficient heat exchange efficiency. Therefore, in the embodiment of the present application, the flow direction of the exhaust gas is specified to be perpendicular to the axial direction of the heat exchange tube 116, that is, the direction of the water flow in the heat exchange tube 116.

[0025] Further, both sides of the box body 111 are provided with connecting parts 117, which are arranged on both sides of the bracket 112, and the connecting parts 117 simultaneously connect two adjacent heat exchange tubes 116. It can be understood that a plurality of heat exchange tubes 116 are arranged along the height direction on the bracket 112, and the first and second heat exchange tubes 116 along the height direction can be connected through the connecting parts 117 on either side of the bracket 112; the connecting parts 117 on the other side of the bracket 112 can connect the second heat exchange tube 116 with the third heat exchange tube 116, and so on, so that the plurality of heat exchange tubes 116 are connected in an S-shaped manner, so that the water flows along the S-shaped line in the box body 111, and the water flow directions between the two adjacent heat exchange tubes 116 are opposite, so that the water flow can enter the heat exchanger 110 from the water inlet pipe 119, and be discharged from the water outlet pipe 120 to the water storage tank 106, so that the water fully contacts the heat exchange tubes 116 in the heat exchanger 110 to achieve effective heating. It is understandable that the water inlet pipe 119 and the water outlet pipe 120 are located at both ends of the box body 111 along the length direction, the water inlet pipe 119 is located at the upper part of the box body 111 along the height direction, and the water outlet pipe 120 is located at the bottom of the box body 111.

[0026] Furthermore, the heat exchange tube 116 is provided with a plurality of fins 121 extending in the radial direction thereof, and a channel for allowing airflow to pass is provided between two adjacent fins 121, and the channel is perpendicular to the direction of the water flow in the heat exchange tube 116, thereby guiding the exhaust gas to flow in a direction perpendicular to the water flow in the heat exchange tube 116, and the contact area between the exhaust gas and the heat exchange tube 116 can be increased through the fins 121, so as to increase the heat exchange efficiency between the exhaust gas and the heat exchange tube 116. It can be understood that the fin 121 includes a windward portion 122 and an extension portion 123, and the extension portion 123 is located on the side of the heat exchange tube 116 that is away from the air inlet pipe 114, and the extension portion 123 extends outward in a direction perpendicular to the axis of the heat exchange tube 116, which can effectively increase the contact area between the fin 121 and the exhaust gas, thereby improving the heat exchange efficiency.

[0027] It can be understood that the heat exchange tube 116 has an elliptical cross-sectional shape, and the major axis extension direction in the cross-sectional shape of the heat exchange tube 116 is parallel to the extension direction of the extension portion 123, that is, the major axis direction of the cross-sectional ellipse of the heat exchange tube 116 is parallel to the flow direction of the exhaust gas, which helps to increase the contact area between the exhaust gas and the outer wall of the heat exchange tube 116 to improve the heat exchange efficiency, and can correspondingly reduce the windward area of ​​the heat exchange tube 116 to reduce the flow resistance of the exhaust gas and improve the exhaust efficiency. Further, referring to Figure 4 The fin 121 has a plurality of connection holes 124 arranged at intervals, and the connection holes 124 have the same shape as the cross section of the heat exchange tube 116. The heat exchange tube 116 is passed through the connection holes 124, and the inner wall of the connection holes 124 abuts against the outer wall of the heat exchange tube 116, so that the fin 121 is in full contact with the heat exchange tube 116. It can be understood that the fin 121 is provided with a plurality of first recesses 125 at the windward portion 122, and the first recesses 125 are located between two adjacent connection holes 124, so that the windward portion 122 has a plurality of arc-shaped outer walls. When the exhaust gas flows from the intake pipe 114 to the inner cavity 118, it can flow along the axial direction of the heat exchange tube 116 through the first recesses 125, so that the exhaust gas is quickly diffused and contacts with a larger range of fins 121, which can effectively improve the heat exchange efficiency. Furthermore, a plurality of second recesses 126 are provided on the extension portion 123, which are staggered with the first recesses 125 and correspond to the connecting holes 124, so that the exhaust gas can flow along the axial direction of the heat exchange tube 116 after passing through the fins 121, thereby reducing air resistance and improving exhaust efficiency.

[0028] In an embodiment of the second aspect of the present invention, a household dishwasher using gas as a single energy source is provided, comprising the above-mentioned gas system. Since the household dishwasher using gas as a single energy source includes all the technical features of the gas system, the household dishwasher using gas as a single energy source also has all the beneficial effects of the gas system.

[0029] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A gas system, characterized in that: include: A gas generator, a heat exchanger, a battery and a control unit, wherein the gas generator comprises an engine and a generator connected to the engine, the exhaust gas outlet of the engine is connected to a heat exchanger, the heat exchanger comprises a box body and a plurality of heat exchange tubes, the inner cavity of the box body is connected to the exhaust gas pipe of the engine, the heat exchange tubes are connected to a water tank, the water in the water tank flows through the heat exchange tubes, and the exhaust gas when the engine is running flows through the inner cavity to heat the water in the water tank, the generator is electrically connected to the battery, and the control unit can supply the electric energy of the battery to various electrical devices.

2. The gas system according to claim 1, characterized in that: The box body is provided with a water inlet pipe and a water outlet pipe connected to the heat exchange tube on both sides along the length direction, and an air inlet pipe and an air outlet pipe connected to the inner cavity are respectively provided on both sides along the width direction. The flow direction of the exhaust gas in the box body is perpendicular to the direction of the water flow in the heat exchange tube.

3. The gas system according to claim 2, characterized in that: The heat exchange tube is provided with a plurality of fins extending in the radial direction thereof, and a channel allowing airflow to pass therethrough is provided between two adjacent fins, and the channel is perpendicular to the direction of water flow in the heat exchange tube.

4. The gas system according to claim 3, characterized in that: The fin comprises a windward portion and an extended portion, wherein the extended portion is located on a side of the heat exchange tube facing away from the air inlet pipe, and the extended portion extends outward in a direction perpendicular to the axis of the heat exchange tube.

5. The gas system according to claim 4, characterized in that: Both sides of the box body are provided with connecting parts, and the connecting parts connect two adjacent heat exchange tubes at the same time.

6. The gas system according to claim 1, characterized in that: A plurality of the heat exchange tubes are arranged at intervals along the height direction of the box body, and the water flow directions between two adjacent heat exchange tubes are opposite.

7. The gas system according to claim 4, characterized in that: The heat exchange tube has an elliptical cross-sectional shape, and an extending direction of a major axis in the cross-sectional shape of the heat exchange tube is parallel to an extending direction of the extension portion.

8. The gas system according to claim 3, characterized in that: The fin has a plurality of connection holes arranged at intervals, the heat exchange tube is passed through the connection holes, and the inner wall of the connection hole abuts against the outer wall of the heat exchange tube.

9. The gas system according to claim 2, characterized in that: The box body includes a bracket and a guide cover, the bracket is used to install the heat exchange tube, the guide cover is located on both sides of the bracket and forms the inner cavity, and the air inlet pipe and the air outlet pipe are respectively arranged on the guide covers on both sides of the bracket.

10. A household dishwasher using gas as the sole energy source, characterized in that: A gas system comprising any one of claims 1 to 9.

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