A gas water heater with anti-mixing function and an anti-mixing control method

Abstract

The present invention discloses a gas water heater with a function of preventing water mixing, which includes a gas water heater body, a circulation pump arranged in the gas water heater body, a hot water pipeline, a cold water pipeline, a water mixing prevention unit, a connecting pipeline and a water using end. One end of the hot water pipeline is connected to the gas water heater body, and the other end is connected to the water using end. One end of the cold water pipeline is connected to the circulation pump through the gas water heater body, and the other end is connected to the water using end. The connecting pipeline is arranged between the hot water pipeline and the cold water pipeline at the water using end, and the water mixing prevention unit is arranged on the connecting pipeline. The present invention also discloses a control method for preventing water mixing in a gas water heater. When the user opens the switch of the cold water pipeline at the water using end, at this time, the water mixing prevention unit detects whether there is water flow in the connecting pipeline. If so, the resistance on the connecting pipeline is increased through the water mixing prevention unit until there is no water flow in the connecting pipeline. If not, it continues to detect until the user closes the cold water pipeline, realizing that there will be no water mixing phenomenon when the cold water is separately opened at the water using point.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas water heaters, and particularly relates to a gas water heater with a water mixing prevention function and a water mixing prevention control method. Background Art

[0002] With the improvement of consumers' requirements for the quality of life, "zero cold water" gas water heaters are becoming more and more common.

[0003] When installing a "zero cold water" gas water heater, there are two actual situations: with a return water pipe and without a return water pipe.

[0004] For the case without a return water pipe, water mixing may occur, that is, part of the hot water is mixed when using cold water; specifically, since there is no return water pipe, but in order to achieve "zero cold water", a one-way valve is provided between the hot water pipe and the cold water pipe, so there is a situation where the one-way valve will open and hot water will flow in when using cold water. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a gas water heater with a water mixing prevention function, which solves the pain point of "water mixing" of the zero cold water gas water heater through a water mixing prevention unit and saves unnecessary consumption of gas.

[0006] Another object of the present invention is to provide a water mixing prevention control method for a gas water heater.

[0007] The technical solution adopted by the present invention is as follows.

[0008] A gas water heater with a water mixing prevention function,

[0009] which includes a gas water heater body, a circulation pump, a hot water pipeline, a cold water pipeline, a water mixing prevention unit, a connecting pipeline and a water using end. The circulation pump is arranged in the gas water heater body. One end of the hot water pipeline is connected to the gas water heater body, and the other end is connected to the water using end. One end of the cold water pipeline is connected to the circulation pump through the gas water heater body, and the other end is connected to the water using end. The connecting pipeline is arranged between the hot water pipeline and the cold water pipeline at the water using end to connect the two. The water mixing prevention unit is arranged on the connecting pipeline.

[0010] Preferably, at least one water using end is provided, and when two or more water using ends are provided, the connecting pipeline is arranged between the hot water pipeline and the cold water pipeline at the most distal water using end to connect the two.

[0011] Preferably, a first flowmeter is arranged on the cold water pipeline at the most distal water using end.

[0012] Preferably, the water mixing prevention unit includes a second flowmeter and a resistance regulating valve, and both the second flowmeter and the resistance regulating valve are arranged on the connecting pipeline.

[0013] Preferably, the second flowmeter is disposed close to the hot water pipeline.

[0014] Preferably, the anti-mixing water unit further includes a check valve, which is disposed on the connecting pipeline to restrict the water flow from the hot water pipeline to the cold water pipeline.

[0015] Preferably, the resistance of the resistance regulating valve is adjusted by a stepper motor.

[0016] A method for controlling anti-mixing water of a gas water heater is specifically as follows: When the user opens the switch corresponding to the cold water pipeline at the water-using end, the anti-mixing water unit detects in real time whether there is water flow in the connecting pipeline. If so, the resistance in the connecting pipeline is increased by the anti-mixing water unit until there is no water flow in the connecting pipeline; if not, the detection continues until the user closes the switch corresponding to the cold water pipeline.

[0017] Preferably, when the anti-mixing water unit detects in real time whether there is water flow in the connecting pipeline, and if so, increases the resistance in the connecting pipeline by the anti-mixing water unit until there is no water flow in the connecting pipeline, it is specifically as follows:

[0018] The second flowmeter detects in real time whether there is water flow in the connecting pipeline. If so, the resistance regulating valve is adjusted by a stepper motor to increase the resistance in the connecting pipeline until the second flowmeter detects that there is no water flow in the connecting pipeline.

[0019] Preferably, the opening and closing of the switch corresponding to the cold water pipeline are specifically as follows: It is judged whether the user opens or closes the switch corresponding to the cold water pipeline according to the detection result of the first flowmeter.

[0020] Compared with the prior art, when the present invention is in use, the user opens the switch corresponding to the cold water pipeline at the water-using end. At this time, the anti-mixing water unit detects in real time whether there is water flow in the connecting pipeline. If so, the resistance in the connecting pipeline is increased by the anti-mixing water unit until there is no water flow in the connecting pipeline; if not, the detection continues until the user closes the switch corresponding to the cold water pipeline. By this means, when the cold water is separately opened at the remote water-using point, the cold water pipeline and the hot water pipeline are separated, and water mixing will not occur. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of a gas water heater with an anti-mixing water function provided in Embodiment 1 of the present invention;

[0022] Figure 2 is a flowchart of a method for controlling anti-mixing water of a gas water heater provided in Embodiment 2 of the present invention;

[0023] Figure 3 is a flowchart of a method for controlling anti-mixing water of a gas water heater in the zero cold water mode provided in Embodiment 2 of the present invention.

[0024] The reference numerals are as follows:

[0025] 1 - Gas water heater body, 2 - Circulation pump, 3 - Hot water pipeline, 4 - Cold water pipeline, 5 - Anti - mixing water unit, 6 - Connecting pipeline, 7 - Water - using end, 41 - First flowmeter, 51 - Second flowmeter, 52 - Resistance regulating valve, 53 - Check valve. Specific embodiments

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Embodiment

[0027] Embodiment 1 of the present invention provides a gas water heater with an anti - mixing water function. As Figure 1 shown, it includes a gas water heater body 1, a circulation pump 2, a hot water pipeline 3, a cold water pipeline 4, an anti - mixing water unit 5, a connecting pipeline 6 and a water - using end 7. The circulation pump 2 is arranged inside the gas water heater body 1. One end of the hot water pipeline 3 is connected to the gas water heater body 1, and the other end is connected to the water - using end 7. One end of the cold water pipeline 4 is connected to the circulation pump 2 through the gas water heater body 1, and the other end is connected to the water - using end 7. The connecting pipeline 6 is arranged between the hot water pipeline 3 and the cold water pipeline 4 at the water - using end 7 for connecting the two. The anti - mixing water unit 5 is arranged on the connecting pipeline 6;

[0028] In this way, with the above - mentioned structure, when the user opens the switch corresponding to the cold water pipeline 4 at the water - using end 7, the anti - mixing water unit 5 detects in real time whether there is water flow on the connecting pipeline 6. If so, the resistance on the connecting pipeline 6 is increased through the anti - mixing water unit 5 until there is no water flow on the connecting pipeline 6. If not, the detection continues until the user closes the switch corresponding to the cold water pipeline 4. In this way, when the cold water is opened separately at the water - using point, the cold water pipeline and the hot water pipeline are separated, and there will be no water mixing.

[0029] At least one water - using end 7 is provided, and when two or more water - using ends 7 are provided, the connecting pipeline 6 is arranged between the hot water pipeline 3 and the cold water pipeline 4 at the most distal water - using end 7 for connecting the two.

[0030] A first flowmeter 41 is arranged on the cold water pipeline 4 at the most distal water - using end 7;

[0031] In this way, by setting the first flowmeter 41, it is possible to visually observe whether there is water flow on the cold water pipeline 4.

[0032] The anti - mixing water unit 5 includes a second flowmeter 51 and a resistance regulating valve 52. Both the second flowmeter 51 and the resistance regulating valve 52 are arranged on the connecting pipeline 6;

[0033] In this way, with this structure, the second flowmeter 51 detects in real time whether there is water flow on the connecting pipeline 6. If so, the resistance regulating valve 52 is adjusted by a stepper motor to increase the resistance on the connecting pipeline 6 until the second flowmeter 51 detects that there is no water flow on the connecting pipeline 6.

[0034] The second flowmeter 51 is arranged close to the hot water pipeline 3.

[0035] The anti - mixing water unit 5 further includes a check valve 53. The check valve 53 is arranged on the connecting pipeline 6 to limit the water flow from the hot water pipeline 3 to the cold water pipeline 4.

[0036] The resistance of the resistance regulating valve 52 is adjusted by a stepper motor. Embodiment

[0037] Embodiment 2 of the present invention provides a method for controlling anti - mixing water of a gas water heater, as Figure 2 shown, which specifically includes the following steps:

[0038] Step 1: Open the switch corresponding to the cold water pipeline 4 at the water - using end 7;

[0039] Step 2: The first flowmeter 41 detects that there is water flow on the cold water pipeline 4;

[0040] Step 3: The second flowmeter 51 detects in real time whether there is water flow on the connecting pipeline 6;

[0041] Step 4: If so, the resistance regulating valve 52 is adjusted by a stepper motor to increase the resistance on the connecting pipeline 6 until the second flowmeter 51 detects that there is no water flow on the connecting pipeline 6;

[0042] On the contrary, the first flowmeter 41 detects whether there is water flow on the cold water pipeline 4. If so, return to Step 3; otherwise, it proves that the user has closed the switch corresponding to the cold water pipeline 4 and the water use is completed.

[0043] In this way, when the user opens the switch corresponding to the cold water pipeline 4 at the water - using end, at this time, the second flowmeter 51 detects in real time whether there is water flow on the connecting pipeline 6. If so, the resistance on the connecting pipeline is increased through the resistance regulating valve 52 until there is no water flow on the connecting pipeline 6. If not, continue to detect until the user closes the switch corresponding to the cold water pipeline 4. By this method, when the cold water is separately opened at the remote water - using point, the cold water pipe and the hot water pipe are separated and there will be no water mixing.

[0044] In addition, the working process of the method of Embodiment 2 of the present invention in the zero - cold - water mode is as Figure 3 shown, which specifically includes the following steps:

[0045] Step 11, the circulation pump 2 operates;

[0046] Step 12, the second flowmeter 51 detects in real time whether there is water flow in the connecting pipeline 6;

[0047] If so, go to Step 13; otherwise, adjust the resistance regulating valve 52 through the stepper motor to reduce the resistance in the connecting pipeline 6 until the second flowmeter 51 detects water flow in the connecting pipeline 6;

[0048] Step 13, the first flowmeter 41 detects whether there is water flow in the cold water pipeline 4. If so, an alarm is given to prompt to close the valve corresponding to the cold water pipeline 4; otherwise, it proves that the user has closed the switch corresponding to the cold water pipeline 4 and the water use is completed.

[0049] As mentioned above, only the preferred specific embodiments of the present invention are described, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A gas water heater with a function of preventing water mixing, characterized in that, It includes a gas water heater body (1), a circulation pump (2), a hot water pipeline (3), a cold water pipeline (4), an anti-mixing water unit (5), a connecting pipeline (6) and a water using end (7). The circulation pump (2) is arranged inside the gas water heater body (1). One end of the hot water pipeline (3) is connected to the gas water heater body (1), and the other end is connected to the water using end (7). One end of the cold water pipeline (4) is connected to the circulation pump (2) through the gas water heater body (1), and the other end is connected to the water using end (7). The connecting pipeline (6) is arranged between the hot water pipeline (3) and the cold water pipeline (4) at the water using end (7) for connecting the two; The anti-mixing water unit (5) includes a second flowmeter (51) and a resistance regulating valve (52), and both the second flowmeter (51) and the resistance regulating valve (52) are arranged on the connecting pipeline (6); The second flowmeter (51) is arranged close to the hot water pipeline (3); When the user opens the switch corresponding to the cold water pipeline (4) at the water using end (7), the second flowmeter (51) detects in real time whether there is water flow on the connecting pipeline (6). If so, the resistance on the connecting pipeline (6) is increased through the resistance regulating valve (52) until there is no water flow on the connecting pipeline (6).

2. The gas water heater with the function of preventing water mixing according to claim 1, characterized in that, At least one water using end (7) is provided. When two or more water using ends are provided, the connecting pipeline (6) is arranged between the hot water pipeline (3) and the cold water pipeline (4) at the most distal water using end (7) for connecting the two; 3. The gas water heater with the function of preventing water mixing according to claim 2, characterized in that, A first flowmeter (41) is arranged on the cold water pipeline (4) at the most distal water using end (7); 4. A gas water heater with a function of preventing water mixing according to claim 1, characterized in that, The anti-mixing water unit (5) further includes a one-way valve (53), and the one-way valve (53) is arranged on the connecting pipeline (6) to restrict the water flow from flowing from the hot water pipeline (3) to the cold water pipeline (4); 5. The gas water heater with the function of preventing water mixing according to claim 4, characterized in that, The resistance of the resistance regulating valve (52) is adjusted by a stepping motor; 6. A method for controlling anti - mixing of hot water in a gas water heater, which is applied to the gas water heater with the anti - mixing function described in any one of claims 1 - 5, characterized in that, Specifically: when the user opens the switch corresponding to the cold water pipeline (4) at the water using end (7), the anti-mixing water unit (5) detects in real time whether there is water flow on the connecting pipeline (6). If so, the resistance on the connecting pipeline (6) is increased through the anti-mixing water unit (5) until there is no water flow on the connecting pipeline (6). If not, the detection continues until the user closes the switch corresponding to the cold water pipeline (4); 7. A method for controlling anti - mixing of a gas water heater according to claim 6, characterized in that, The anti-mixing water unit (5) detects in real time whether there is water flow on the connecting pipeline (6). If so, the resistance on the connecting pipeline (6) is increased through the anti-mixing water unit (5) until there is no water flow on the connecting pipeline (6). Specifically: The second flowmeter (51) detects in real time whether there is water flow on the connecting pipeline (6). If so, the resistance regulating valve (52) is adjusted by a stepping motor to increase the resistance on the connecting pipeline (6) until the second flowmeter (51) detects that there is no water flow on the connecting pipeline (6); 8. A method for controlling anti - mixing of a gas water heater according to claim 6 or 7, characterized in that, The opening and closing of the switch corresponding to the cold water pipeline (4) specifically are: judging whether the user opens or closes the switch corresponding to the cold water pipeline (4) according to the detection result of the first flowmeter (41).

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