Energy-saving water supply system for motor home and control method

Abstract

The invention relates to the technical field of motor homes, and discloses an energy-saving water supply system for a motor home and a control method, the energy-saving water supply system comprises a heat exchanger, a closed type heat preservation hot water tank and an open type clear water tank which are connected with a secondary water outlet of the heat exchanger, and a water mixing valve which is communicated with the closed type heat preservation hot water tank and the open type clear water tank and is used for a water consumption unit; a primary water outlet of the closed heat preservation hot water tank is connected with a secondary water inlet of the heat exchanger through a heating pump, and a secondary water outlet of the heat exchanger is connected with a primary water return port of the closed heat preservation hot water tank and a water inlet of the open type clear water tank through valves. A water outlet of the open clear water tank is connected with a secondary water inlet of the closed heat-preservation hot water tank through a cold water pump; the flow direction of hot water at the secondary water outlet of the heat exchanger is controlled through the valve, then through the arrangement of the closed heat preservation hot water tank and the open clear water tank, heat of water passing through the engine is utilized to the maximum extent, the use requirements in different environments are met, meanwhile, the number of water pumps is reduced, and the use cost is effectively reduced.

Description

Technical Field

[0001] The present application relates to the field of recreational vehicle technology, and in particular to an energy-saving water supply system and control method for recreational vehicles. Background Art

[0002] Under the existing technology, when a motorhome is driving, most of the excess heat generated by the engine is dissipated through the radiator, resulting in a huge waste of heat. Although some heat exchange systems can recover and reuse the heat generated by the engine's excess heat, the system settings are extremely complicated and the number of water pumps is large. Not only is the operation complicated and the cost of use high, it is also difficult to effectively meet the use conditions under different working conditions in winter and summer, and therefore it is difficult to achieve the goal of high efficiency and energy saving. Summary of the Invention

[0003] In order to overcome the above technical problems, the present application provides an energy-saving water supply system and control method for RVs.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] An energy-saving water supply system for a recreational vehicle, comprising:

[0006] A heat exchanger connected to the engine superheater, a closed insulated hot water tank and an open clean water tank connected to the secondary water outlet of the heat exchanger, and a mixing valve for a water unit connected to the closed insulated hot water tank and the open clean water tank;

[0007] The primary water outlet of the closed thermal insulation hot water tank is connected to the secondary water inlet of the heat exchanger through a heating pump, and the secondary water outlet of the heat exchanger is connected to the primary return water inlet of the closed thermal insulation hot water tank and the water inlet of the open clean water tank through valves respectively; the water outlet of the open clean water tank is connected to the secondary water inlet of the closed thermal insulation hot water tank through a cold water pump.

[0008] Among them, the valve includes a first one-way valve arranged on the pipeline between the secondary water outlet of the heat exchanger and the primary water inlet of the closed insulated hot water tank, and a first switch valve arranged on the pipeline between the secondary water outlet of the heat exchanger and the water inlet of the open clean water tank.

[0009] Among them, a first temperature sensor and a water level sensor are provided in the closed insulated hot water tank, the first temperature sensor is electrically connected to the heating pump through an electronic control device, and the water level sensor is electrically connected to the cold water pump through an electronic control device; a second temperature sensor electrically connected to the electronic control device is provided in the open clean water tank.

[0010] Among them, it also includes a diesel water heater connected to the engine superheater through a three-way valve and a third one-way valve; the water inlet of the diesel water heater is connected to the water outlet of the third one-way valve and the third water outlet of the three-way valve through a water heating pump; the water outlet of the diesel water heater is connected to the primary water inlet of the heat exchanger, the primary water outlet of the heat exchanger is connected to the first water inlet of the three-way valve, and the second water outlet of the three-way valve is connected to the water inlet of the engine superheater.

[0011] Wherein, a heating heat exchanger is connected in parallel on the pipeline between the water outlet of the diesel water heater and the first water inlet of the three-way valve, and a second switch valve is connected to the circuit of the heating heat exchanger.

[0012] A control method for the energy-saving water supply system includes the following steps:

[0013] 1) When using water in summer, the hot water in the heat exchanger is closed by closing the first switch valve to heat the water in the closed thermal insulation hot water tank, and the water is supplied to the mixing valve of the water unit through the cold water pump for mixing;

[0014] 2) When using water in winter, the first switch valve is opened to allow all the hot water in the heat exchanger to flow into the open clean water tank and the closed insulated hot water tank. The cold water pump circulates to heat all the water in the open clean water tank and the closed insulated hot water tank to a preset temperature. At the same time, according to the water levels of the open clean water tank and the closed insulated hot water tank, the hot water pump and the cold water pump work together to supply water to the mixing valve of the water unit for use.

[0015] Beneficial effects of the present invention: The present invention provides an energy-saving water supply system for a recreational vehicle, comprising a heat exchanger connected to an engine overheating system, a closed insulated hot water tank and an open clean water tank connected to a secondary water outlet of the heat exchanger, and a mixing valve for a water unit connected to the closed insulated hot water tank and the open clean water tank; the primary water outlet of the closed insulated hot water tank is connected to the secondary water inlet of the heat exchanger via a heating pump, and the secondary water outlet of the heat exchanger is connected to the primary return water outlet of the closed insulated hot water tank and the water inlet of the open clean water tank via valves; the water outlet of the open clean water tank is connected to the secondary water inlet of the closed insulated hot water tank via a cold water pump. The energy-saving water supply system with this structural design can conveniently and flexibly control the flow direction of hot water from the secondary water outlet of the heat exchanger through the setting of the valve, and then, through the setting of the closed insulated hot water tank and the open clean water tank, maximize the utilization of the heat from the engine overheating system, thereby meeting the use requirements in different environments, while also reducing the number of water pumps and effectively reducing the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a connection diagram of an energy-saving water supply system for a recreational vehicle in the present application.

[0017] Description of reference numerals:

[0018] 1. Engine overheating; 2. Heat exchanger; 3. Closed insulated hot water tank; 31. First temperature sensor; 32. Water level sensor; 4. Open clean water tank; 41. Second temperature sensor; 42. Water inlet; 5. Mixing valve; 51. Hot water pipe; 52. Cold water pipe; 61. Heating pump; 62. Hot water pump; 7. Cold water pump; 81. First non-return valve; 82. First on-off valve; 83. Second non-return valve; 91. Three-way valve; 92. Diesel water heater; 93. Water heating pump; 94. Third non-return valve; 95. Heating heat exchanger; 96. Second on-off valve. DETAILED DESCRIPTION

[0019] The present application is further described in detail below with reference to the accompanying drawings.

[0020] Reference Figure 1 As shown, this embodiment takes a recreational vehicle as an example and provides an energy-saving water supply system for a recreational vehicle, which includes a heat exchanger 2 connected to an engine superheater 1, a closed insulated hot water tank 3 and an open clean water tank 4 connected to the secondary water outlet of the heat exchanger 2, and a mixing valve 5 for a water use unit connected to the closed insulated hot water tank 3 and the open clean water tank 4; wherein, the primary water outlet of the closed insulated hot water tank 3 is connected to the secondary water inlet of the heat exchanger 2 through a heating pump 61, and the secondary water outlet of the heat exchanger 2 is connected to the primary return water port of the closed insulated hot water tank 3 and the water inlet of the open clean water tank 4 through valves respectively; the water outlet of the open clean water tank 4 is connected to the secondary water inlet of the closed insulated hot water tank 3 through a cold water pump 7.

[0021] Specifically, the above-mentioned valves include a first one-way valve 81 arranged on the pipeline between the secondary water outlet of the heat exchanger 2 and the primary water inlet of the closed insulated hot water tank 3, and a first switch valve 82 arranged on the pipeline between the secondary water outlet of the heat exchanger 2 and the water inlet of the open clean water tank 4.

[0022] When water is used in summer, whether the engine is working to utilize superheated water or the diesel water heater is working alone to provide heat to the heat exchanger 2, the first switch valve 82 can be closed, and the heating pump 61 connected to the primary water outlet of the closed thermal insulation hot water tank 3 is used to make the hot water flowing out of the secondary water outlet of the heat exchanger 2 flow into the closed thermal insulation hot water tank 3 through the first one-way valve 81, thereby realizing the heat exchange between the secondary of the heat exchanger 2 and the closed thermal insulation hot water tank 3; at the same time, water is used to relieve pressure according to the mixing valve 5 of the water use unit, and the cold water in the open clean water tank 4 is automatically replenished to the closed thermal insulation hot water tank 3 through the cold water pump 7; in this state, the hot water pump 62 does not need to work, and the water demand of the mixing valve 5 in the water use unit can be met by the water pressure of the cold water pump 7, while also making the hot water in the closed thermal insulation hot water tank 3 fully utilized.

[0023] In order to further adjust the water temperature of the closed insulated hot water tank 3, a first temperature sensor 31 is provided in the closed insulated hot water tank 3, wherein the first temperature sensor 31 is electrically connected to the heating pump 61 through an electronic control device, so that when the water temperature in the closed insulated hot water tank 3 is too low or too high, the water in the closed insulated hot water tank 3 can be heated by starting the primary heat source of the heat exchanger 2 and the heating pump 61.

[0024] As another usage environment, when used in winter, the first on-off valve 82 can be opened, allowing the hot water in the heat exchanger 2 to flow into the open clean water tank 4 and the closed insulated hot water tank 3, and the hot water in the open clean water tank 4 and the closed insulated hot water tank 3 is circulated and heated to a preset temperature by the cold water pump 7. Since the open clean water tank 4 is also provided with a second temperature sensor 41 electrically connected to the electronic control device, and the first temperature sensor 31 and the water level sensor 32 are provided in the closed insulated hot water tank 3 and are electrically connected to the electronic control device, the cold water pump 7 can be activated in a timely manner based on the water temperature signal in the closed insulated hot water tank 3 and the preset water temperatures in the open clean water tank 4 and the closed insulated hot water tank, thereby circulating the water in the open clean water tank 4, the closed insulated hot water tank 3, and the heat exchanger 2. The heat generated by the engine superheater 1 or the diesel water heater 92 is then used to heat the water in the closed insulated hot water tank 3 and the open clean water tank 4 to a suitable temperature through the heat exchanger 2.

[0025] When the water temperature in the open clean water tank 4 and the closed insulated hot water tank 3 reaches the preset temperature, the cold water pump 7 and the diesel water heater 92 can stop and enter the standby state. When the water level in the closed insulated hot water tank 3 is low, the cold water pump 7 can be started to replenish water to the closed insulated hot water tank 3. At this time, if the engine is working and does not need to heat hot water, the three-way valve 91 can be placed in a state of connecting to the diesel water heater 92. At the same time, water is supplied to the mixing valve 5 in the water unit through the hot water pump 62 connected to the closed insulated hot water tank 3. At this time, the heating pump 61 does not need to work and the cold water pipe 52 does not need to supply water. In order to prevent the water entering the closed insulated hot water tank 3 from flowing into the open clean water tank 4, a first one-way valve 81 is added between the secondary water outlet of the heat exchanger 2 and the return water outlet of the closed insulated hot water tank 3, and all cold water is sent to the heat exchanger 2 for heat exchange through the cold water valve 7. At the same time, in order to prevent the mixing valve 5 in the water unit from returning the hot water through the cold water pipe 52 to relieve pressure, a second one-way valve 83 is installed on the cold water pipe 52.

[0026] To be more specific, the above-mentioned energy-saving water supply system also includes a diesel water heater 92 connected to the engine superheater 1 through a three-way valve 91 and a third one-way valve 94; wherein, the water inlet of the diesel water heater 92 is connected to the water outlet of the third one-way valve 94 and the third water outlet of the three-way valve 91 through a water heating pump 93; the water outlet of the diesel water heater 92 is connected to the primary water inlet of the heat exchanger 2, the primary water outlet of the heat exchanger 2 is connected to the first water inlet of the three-way valve 91, and the second water outlet of the three-way valve 91 is connected to the water inlet of the engine superheater 1. This structural arrangement, through the setting of the three-way valve 91, when the diesel water heater 92 works alone, the primary water outlet of the heat exchanger 2 is connected to the water inlet of the diesel water heater 92 through the three-way valve 91, and at the same time, under the action of the third one-way valve 94, it can effectively prevent heat from flowing into the engine and causing heat loss; when the RV engine works alone, the primary water outlet of the heat exchanger 2 is connected to the return water outlet of the engine superheated water through the three-way valve 91, and at the same time, the diesel water heater 92 and the water heating pump 93 are closed, and the engine superheated water can realize heat exchange with the heat exchanger 2, so that the heat supply conversion between the RV engine and the diesel water heater 92 can be conveniently and flexibly met.

[0027] In addition, in order to further meet the various usage needs of the RV, a heating heat exchanger 95 is connected in parallel on the pipeline between the water outlet of the diesel water heater 92 and the first water inlet of the three-way valve 91, and a second switch valve is connected to the circuit of the heating heat exchanger 95; this setting can completely shut down the heating heat exchanger 95 in summer, effectively preventing the engine from overheating and bringing heat into the car through the heating heat exchanger 95.

[0028] In addition, this embodiment also provides a control method for the above energy-saving water supply system, comprising the following steps:

[0029] 1) During summer water use, the first on-off valve 82 is closed, allowing the hot water in the heat exchanger 2 to heat the water in the closed thermal insulation hot water tank 3, which is then pressure-fed by the cold water pump 7 and supplied to the mixing valve 5 in the water unit. At this time, the hot water pump 62 does not need to operate, and all water pressure can be achieved by the cold water pump 7. This not only reduces the number of water pumps operating, but also fully utilizes the water in the closed thermal insulation hot water tank 3.

[0030] 2) When using water in winter, by opening the first switch valve 82, all the hot water in the heat exchanger 2 flows into the open clean water tank 4 and the closed insulated hot water tank 3, and the cold water pump 7 circulates so that all the water in the open clean water tank 4 and the closed insulated hot water tank 3 is heated to a preset temperature; thereafter, the cold water pump 7 can be stopped and enter a standby state. When the water level in the closed insulated hot water tank 33 is low, the cold water pump 7 is started again to replenish water to the closed insulated hot water tank 33, and at the same time, water is supplied to the mixing valve 5 in the water use unit through the closed insulated hot water tank 33. At this time, the heating pump 61 does not need to work, and the cold water pipe 52 does not need to supply water. The water demand of the mixing valve 5 in the water use unit can be met only by the hot water pump 62 and the cold water pump 7.

[0031] In the above two modes, the setting of the first switch valve 82 can not only effectively reduce the number of water pump starts, thus achieving the real purpose of energy saving, but also make full use of the excess water heat generated by the engine.

[0032] In this application, since the heating pump 61, the hot water pump 62, and the water heating pump 93 need to stop working under one of the working conditions, a centrifugal water pump with a connecting function must be preferably selected; if a diaphragm pump with a isolating function is selected, a same-direction one-way valve needs to be connected in parallel. The specific settings in this regard are relatively commonly used in related technologies and will not be described in detail here.

[0033] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the present invention.

Claims

1. An energy-saving water supply system for a recreational vehicle, characterized in that: include: A heat exchanger connected to the engine superheater, a closed insulated hot water tank and an open clean water tank connected to the secondary water outlet of the heat exchanger, and a mixing valve for a water unit connected to the closed insulated hot water tank and the open clean water tank; The primary water outlet of the closed thermal insulation hot water tank is connected to the secondary water inlet of the heat exchanger through a heating pump, and the secondary water outlet of the heat exchanger is connected to the primary return water inlet of the closed thermal insulation hot water tank and the water inlet of the open clean water tank through valves respectively; the water outlet of the open clean water tank is connected to the secondary water inlet of the closed thermal insulation hot water tank through a cold water pump.

2. The energy-saving water supply system for a recreational vehicle according to claim 1, characterized in that: The valve includes a first one-way valve arranged on the pipeline between the secondary water outlet of the heat exchanger and the primary water inlet of the closed insulated hot water tank, and a first switch valve arranged on the pipeline between the secondary water outlet of the heat exchanger and the water inlet of the open clean water tank.

3. The energy-saving water supply system for a recreational vehicle according to claim 1, characterized in that: A first temperature sensor and a water level sensor are provided in the closed insulated hot water tank. The first temperature sensor is electrically connected to the heating pump through an electronic control device, and the water level sensor is electrically connected to the cold water pump through an electronic control device. A second temperature sensor electrically connected to the electronic control device is provided in the open clean water tank.

4. The energy-saving water supply system for a recreational vehicle according to claim 1, characterized in that: It also includes a diesel water heater connected to the engine superheater through a three-way valve and a third one-way valve; the water inlet of the diesel water heater is connected to the water outlet of the third one-way valve and the third water outlet of the three-way valve through a water heating pump; the water outlet of the diesel water heater is connected to the primary water inlet of the heat exchanger, the primary water outlet of the heat exchanger is connected to the first water inlet of the three-way valve, and the second water outlet of the three-way valve is connected to the water inlet of the engine superheater.

5. The energy-saving water supply system for a recreational vehicle according to claim 4, characterized in that: A heating heat exchanger is connected in parallel on the pipeline between the water outlet of the diesel water heater and the first water inlet of the three-way valve, and a second switch valve is connected to the circuit of the heating heat exchanger.

6. A control method for the energy-saving water supply system according to any one of claims 1 to 5, characterized in that: The steps include: 1) When using water in summer, the hot water in the heat exchanger is closed by closing the first switch valve to heat the water in the closed thermal insulation hot water tank, and the water is supplied to the mixing valve of the water unit through the cold water pump; 2) When using water in winter, the first switch valve is opened to allow all the hot water in the heat exchanger to flow into the open clean water tank and the closed insulated hot water tank. The cold water pump circulates the water in the open clean water tank and the closed insulated hot water tank to heat all the water to the preset temperature. At the same time, according to the water levels of the open clean water tank and the closed insulated hot water tank, the hot water pump and the cold water pump work together to supply the water to the mixing valve of the water use unit.

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