Multi-machine parallel hot water system

Abstract

The utility model discloses a multi-machine parallel water heating system which is characterized in that the multi-machine parallel water heating system comprises more than two gas water heaters, a central controller and connecting wires, the central controller is connected with the gas water heaters through the connecting wires, and each gas water heater is provided with a communication boosting plate which is used for enhancing communication signals and improving transmission distance; a water proportional valve with a cut-off function is arranged on a water inlet pipe of the gas water heater, the central controller is connected with and controls the water proportional valve, and starting and stopping of the whole machine are controlled by opening and closing the valve. The system is good in stability, easy to install and low in use and after-sales maintenance cost.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, and more specifically to a multi-machine parallel hot water system. Background Art

[0002] At present, the hot water output rate (temperature rise 25k) of gas water heaters on the market is mostly 12-16kg / min, which can only meet the bathing needs of two water points at most. In the cold winter, the water inlet temperature is low, and it can even only meet the bathing needs of one water point, causing great inconvenience to users. For families with multiple bathrooms (small villas), it is impossible to meet the bathing needs at the same time; in addition, small commercial scenarios, such as small hotels, private swimming pools, public dormitories, etc., also need to meet the bathing needs of multiple water points at the same time. To solve the above problems, there are often the following solutions:

[0003] (1) Choose a volumetric water heater or a compound hot water system. However, such equipment is large in size, occupies a large area, has many auxiliary equipment, is complex to install, and has high operating and maintenance costs.

[0004] (2) Developing high-power gas water heaters is costly for manufacturers. In addition, high-power appliances exceeding 70 kW fall into the category of commercial boilers, which are difficult to develop and require high technical requirements.

[0005] (3) Use multi-machine parallel technology. For example, patent application documents CN 109059252 A, CN 108954841 B, CN 104197502 A, and CN201037690Y disclose a gas water heater online device. Although this patent can effectively provide a large amount of hot water, it requires the addition of an additional control system and a water solenoid valve and other devices for each slave water heater. The structure is complex, the control is inconvenient, and the maintenance and installation costs are high.

[0006] Therefore, it is necessary to further improve the prior art. Summary of the invention

[0007] The purpose of the utility model is to provide a stable and reliable multi-machine parallel hot water system to address the deficiencies of the prior art, with a simple system, no need for an external water circuit electromagnetic shut-off valve, simple wiring, simple system installation, low cost of use and after-sales maintenance, and networking machines that can be selected as needed. It has a high cost-effectiveness and can meet the needs of various water use scenarios.

[0008] The utility model adopts the following technical solutions to achieve the above-mentioned purpose: a multi-machine parallel hot water system, characterized in that it includes more than two gas water heaters, a central controller, and connecting lines. The central controller is connected to the gas water heaters through connecting lines. Each gas water heater is respectively provided with a communication booster board, which functions to enhance the communication signal and increase the transmission distance; a water proportional valve with a cut-off function is provided on the water inlet pipe of the gas water heater, and the central controller is connected to control the water proportional valve, and the start and stop of the whole machine are controlled by opening and closing the valve.

[0009] As a further illustration of the above solution, the central controller is configured with a number of buttons and status indicator lights and display screens that match each gas water heater.

[0010] Furthermore, the water inlet pipes of more than two gas water heaters are connected in parallel, the water outlet pipes of more than two gas water heaters are connected in parallel, the parallel connected water inlet pipes are externally connected to a main cold water inlet pipe, and the main cold water inlet pipe is provided with a manual stop valve.

[0011] Preferably, the number of gas water heaters arranged in parallel is five, which are networked with a central control system to achieve functions such as unified control and fault handling.

[0012] Furthermore, in the standby state, the water proportional valve of one gas water heater is in a fully open state, and the water proportional valves of the other gas water heaters are in a closed state.

[0013] Furthermore, after the gas water heater is working, the current working gear and proportional valve current are determined. When the gear is at the highest gear and the proportional valve current is greater than (PL+PH) / 2 and lasts for 10s, it is determined that the second gas water heater needs to be turned on. When one of the two gas water heaters also meets the previous condition, it is determined that the third gas water heater needs to be turned on, and so on. When multiple gas water heaters are working at the same time, if the current load of a gas water heater is at the minimum gear and lasts for 10s, the central control terminal will close the water proportional valve of one gas water heater until only one gas water heater is working.

[0014] Furthermore, the water proportional valve is provided with an anti-stuck function module. When the water proportional valve of the gas water heater in a non-working state does not operate for more than 24 hours, the system will perform an open-close action.

[0015] The beneficial effects that can be achieved by the utility model using the above technical solution are:

[0016] 1. The utility model adopts a multi-machine parallel hot water system mainly composed of more than two gas water heaters, a central controller, and connecting wires. It is easy to install and maintain: it can be installed indoors or outdoors, and the water heater only needs regular maintenance. During maintenance, only a single water heater is performed, which does not affect the operation and use of the entire system;

[0017] 2. Intelligent, comfortable and energy-saving: The system automatically starts the corresponding number of machines according to the required hot water load. It is not necessary to start all machines at the same time, and it can start and stop intelligently.

[0018] 3. Fault handling: The system automatically identifies the number of online machines. When the cumulative failure of each online machine exceeds 3 times and exceeds 50%, the central controller will sound an alarm and the system will automatically enter the protection state;

[0019] 4. Safe, reliable and durable: The system automatically counts the cumulative usage time of each machine, determines whether it is currently started, and reduces the usage time of a single machine; the system has a water valve anti-stuck function, that is, when the machine is in a non-working state for more than 24 hours, the water valve is switched on and off. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the hot water system structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the gas water heater of the utility model;

[0022] Figure 3 It is a schematic diagram of the structure of the central controller;

[0023] Figure 4 Design a schematic for a hot water system.

[0024] Explanation of the reference numerals: 1. gas water heater 2. central controller 2-1. button 2-2. status indicator light 2-3. display screen 3. connecting line 4. communication booster board 5. water proportional valve 6. water inlet pipe 7. water outlet pipe 8. main cold water inlet pipe 9. manual stop valve. DETAILED DESCRIPTION

[0025] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present invention.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, "at least" means one or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise specified and limited, the terms "assembly", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the utility model, unless otherwise specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "below" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the height of the second feature. A first feature being "above", "below" and "below" a second feature includes that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the second feature.

[0029] The following is a further description of the specific implementation of the utility model in conjunction with the drawings of the specification, so that the technical solution and its beneficial effects of the utility model are clearer and more explicit. The following description of the embodiments with reference to the drawings is exemplary and intended to explain the utility model, and cannot be understood as limiting the utility model.

[0030] like Figure 1-Figure 4 As shown, the utility model is a multi-machine parallel hot water system, including five gas water heaters 1, a central controller 2, and a connecting line 3. The central controller is connected to the gas water heater through the connecting line. The central controller 2 is equipped with 4 buttons 2-1, 5 status indicator lights 2-2, and 1 "88" display screen 2-3. The five water heaters are networked with one central control to achieve functions such as unified control and fault handling. Each gas water heater 1 is respectively provided with a communication booster board 4, which is used to enhance the communication signal and increase the transmission distance; the water inlet pipe of the gas water heater 1 is provided with a water proportional valve 5 with a cut-off function, and the central controller is connected to control the water proportional valve, and the start and stop of the whole machine are controlled by opening and closing the valve.

[0031] The water inlet pipes 6 of the five gas water heaters 1 are connected in parallel, the water outlet pipes 7 of the five gas water heaters are connected in parallel, the water inlet pipes connected in parallel are externally connected to a main cold water inlet pipe 8, and the main cold water inlet pipe is provided with a manual stop valve 9.

[0032] Operation principle: When the system has no water demand, the central controller will keep the water proportional valve of one water heater fully open, and the water proportional valves of other water heaters will be closed. When the system has water demand, the water heater will select the conditions for determining the number of water heaters to start by the current gear and the current of the proportional valve. When the water consumption gradually decreases until the end, the central controller will retain the water heater with the shortest usage time according to the accumulated time, and the water proportional valves of other water heaters will be closed. The system also has functions such as automatic fault handling. The details are as follows:

[0033] (1) Increase or decrease in the number of water heaters

[0034] The number of gas water heaters to be started is determined by the gear position of the water heater and the current of the proportional valve. The specific plan is as follows:

[0035] To ensure normal use, in standby mode, the water proportional valve of one water heater will be fully open, and the water proportional valves of other water heaters will be closed. After the water heater is working, the current working gear and proportional valve current are determined. When the gear is at the highest and the proportional valve current is greater than (PL+PH) / 2 and lasts for 10s, it is determined that the second water heater needs to be turned on. When one of the two water heaters also meets the previous condition, it is determined that the third water heater needs to be turned on, and so on. When multiple water heaters are working at the same time, if the current load of a water heater is at the minimum gear and lasts for 10s, the central control terminal will close the water proportional valve of one water heater until only one water heater is working.

[0036] (2) Water heater life protection

[0037] The central control terminal records the cumulative working time of each normal water heater and determines the order of opening or closing the water proportional valve according to the time and load flag:

[0038] ① Initial power-on - open the water proportional valve of the water heater with the shortest working time;

[0039] ②When working, the second water heater needs to be turned on - open the water proportional valve of the water heater with the shortest working time;

[0040] ③When working, the water heater needs to be turned off - turn off the water proportional valve of the water heater with the longest working time;

[0041] ④ If the machine needs to be switched due to a fault during operation, open the proportional valve of the water heater with the shortest working time;

[0042] The cumulative working time is accumulated after the water heater stops working to prevent the water heater from being switched frequently.

[0043] (3) Fault determination and handling

[0044] The central control terminal is equipped with an independent fault flag (to prevent the water heater from reporting a fault and the fault will be automatically cleared after the water proportional valve is closed). The fault flag is updated according to the water heater data mark. When more than 50% of the online products fail, the central control terminal will issue an alarm and the fault flag will be cleared by short pressing the setting button.

[0045] (4) Water proportional valve anti-stuck function

[0046] When the water proportional valve of a gas water heater in a non-working state does not move for more than 24 hours, the system will perform an open-close action.

[0047] Compared with the prior art, the utility model has the following advantages: 1. Easy installation and maintenance: it can be installed indoors or outdoors, and the water heater only needs regular maintenance. During maintenance, only a single water heater is required, which does not affect the operation and use of the entire system;

[0048] 2. Intelligent, comfortable and energy-saving: The system automatically starts the corresponding number of machines according to the required hot water load. It is not necessary to start all machines at the same time, and it can start and stop intelligently.

[0049] 3. Fault handling: The system automatically identifies the number of online machines. When the cumulative failure of each online machine exceeds 3 times and exceeds 50%, the central controller will sound an alarm and the system will automatically enter the protection state;

[0050] 4. Safe, reliable and durable: The system automatically counts the cumulative usage time of each machine, determines whether it is currently started, and reduces the usage time of a single machine; the system has a water valve anti-stuck function, that is, when the machine is in a non-working state for more than 24 hours, the water valve is switched on and off.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A multi-machine parallel hot water system, characterized in that: It includes more than two gas water heaters, a central controller, and connecting lines. The central controller is connected to the gas water heaters through connecting lines. Each gas water heater is provided with a communication booster board, which is used to enhance the communication signal and increase the transmission distance. A water proportional valve with a cut-off function is provided on the water inlet pipe of the gas water heater. The central controller is connected to control the water proportional valve and controls the start and stop of the whole machine by opening and closing the valve.

2. A multi-machine parallel hot water system according to claim 1, characterized in that: The central controller is equipped with a plurality of buttons and status indicator lights and a display screen that match the respective gas water heaters.

3. A multi-machine parallel hot water system according to claim 1, characterized in that: The water inlet pipes of more than two gas water heaters are connected in parallel, the water outlet pipes of more than two gas water heaters are connected in parallel, the parallel connected water inlet pipes are externally connected to a main cold water inlet pipe, and the main cold water inlet pipe is provided with a manual stop valve.

4. A multi-machine parallel hot water system according to claim 1, characterized in that: The number of gas water heaters set up in parallel is five, which are networked with a central control system to achieve unified control and fault handling functions.

5. The multi-machine parallel hot water system according to claim 1, characterized in that: The water proportional valve is equipped with an anti-stuck function module. When the water proportional valve of the gas water heater in a non-working state does not move for more than 24 hours, the system will perform an open-close action.

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