Pipeline system and control method of gas water heater

Abstract

The present invention discloses a pipeline system and control method for a gas water heater. The system comprises a gas water heater body, a return water pump, a temperature sensor, a return water branch pipe and a one-way valve arranged on the return water branch pipe. The return water pump and the temperature sensor are both arranged on the water inlet pipe of the gas water heater body. The return water branch pipe is used to connect the external hot water pipe and the cold water pipe of the gas water heater body to form a return water pipeline. The system also comprises: a water flow sensor, which is arranged on the cold water end of an external water use point, and the water flow sensor is used to detect the water flow at the cold water end of the external water use point; a pipeline control component, which is arranged on the return water branch pipe, and the pipeline control component is used to prevent the water flow in the return water branch pipe from reaching the starting flow of the gas water heater body due to water use at the cold water end of the external water use point; and a controller, which is electrically connected to the water flow sensor and the pipeline control component respectively.

Description

Technical Field

[0001] The present invention relates to the technical field of gas water heaters, and in particular to a pipeline system and a control method of a gas water heater. Background Art

[0002] Existing zero cold water gas water heaters are usually divided into three-pipe solutions (hot water pipe, cold water pipe, return pipe) and two-pipe solutions (hot water pipe, cold water pipe). The existing two-pipe zero cold water water heaters connect the cold and hot water pipes through branch pipes and one-way valves. When the cold water faucet of the wash basin is turned on, the toilet is flushed, the cold water of the shower or the washing machine is turned on, there is usually a problem of the gas water heater starting up automatically, especially when flushing the toilet. The water heater will start up automatically for a short time when flushing the toilet. After the toilet is flushed, no water flows through the gas water heater, and the gas water heater will automatically shut down. In addition to generating noise (there will be ignition noise and fan front cleaning noise when the water heater starts, and there will be fan rear cleaning noise after shutting down), such frequent self-starting will also affect the service life of the gas water heater on-off valve. The main reasons for the water heater starting up automatically are as follows:

[0003] 1. For example, when the external water end is a flush toilet, the water volume of the flush toilet is relatively large. The existing toilet flushing volume is generally 20L~25L / min, and even at the moment of flushing the toilet, the water volume may exceed 25L / min to 30L / min. Such a large amount of water mainly enters the toilet through the cold water pipeline, and the secondary part will enter the hot water pipeline through the gas water heater and then return to the cold water end through the one-way valve to reach the toilet. The amount of water entering the hot water pipe through the gas water heater generally reaches the starting water flow of the gas water heater. Therefore, flushing with a flush toilet will cause the gas water heater to start automatically. Through actual testing, taking a 15m pipe length as an example (the cold and hot pipes laid in households are generally 5~15m), when the toilet flushes at 25L / min, the water volume passing through the hot water pipeline is about 7L / min (the resistance of gas water heaters and one-way valves from different manufacturers will be different).

[0004] 2. The small resistance of the one-way valve and water heater is also one of the reasons for water diversion. If the resistance is large enough, the water volume passing through the gas water heater can be guaranteed to be less than 2L / min. However, too much resistance will affect the delivery of hot water (hot water may not reach the far end or high-rise), and the internal circulation of the gas water heater will affect the heating time of the hot water in the pipeline (the greater the resistance, the longer the heating time, that is, the longer the circulation time). In other words, increasing the resistance of the gas water heater and the one-way valve will put forward higher requirements for the selection of the one-way valve. Summary of the invention

[0005] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention provides a piping system and a control method for a gas water heater, which can achieve the goal that the gas water heater will not start automatically due to water use at an external water point without changing the original system resistance, and at the same time solve the noise problem caused by the false start of the gas water heater and the problem that the frequent false start of the gas water heater affects its own life.

[0006] A piping system for a gas water heater, comprising a gas water heater body, a return water pump, a temperature sensor, a return water branch pipe, and a one-way valve arranged on the return water branch pipe, wherein the return water pump and the temperature sensor are both arranged on the water inlet pipe of the gas water heater body, the return water branch pipe is used to connect an external hot water pipe and a cold water pipe of the gas water heater body to form a return water pipe, and further comprising:

[0007] A water flow sensor is arranged on the cold water end of the external water point, and is used to detect the water flow at the cold water end of the external water point;

[0008] A pipeline control assembly, which is arranged on the water return branch pipe, and is used to prevent the water flow in the water return branch pipe from reaching the start-up flow of the gas water heater body due to water use at the cold water end of the external water point;

[0009] A controller is electrically connected to the water flow sensor and the pipeline control component respectively, and the controller is used to control the pipeline control component according to the water flow information detected by the water flow sensor.

[0010] In some embodiments, the pipeline control component includes an electric three-way water valve arranged on the return branch pipe, two of the passages of the electric three-way water valve are connected to the return branch pipe, a parallel branch pipe is provided between the other passage of the electric three-way water valve and the return branch pipe, and a constant pressure valve is provided on the parallel branch pipe.

[0011] Furthermore, the controller is respectively connected to the water flow sensor and the electric three-way water valve by radio or wired connection.

[0012] In some embodiments, the pipeline control assembly includes an electric water valve disposed on the return branch pipe.

[0013] Furthermore, the controller is respectively connected to the water flow sensor and the electric water valve by radio or wired connection.

[0014] Furthermore, the external water point is a flush toilet.

[0015] A pipeline control method for a gas water heater, which uses the pipeline system of the gas water heater, comprises the following steps:

[0016] S1: The controller receives water flow information detected by the water flow sensor;

[0017] S2: Determine whether the water flow information is greater than or equal to a preset water flow value. If so, control the electric three-way water valve to connect the return branch pipe with the parallel branch pipe; if not, control the electric three-way water valve to keep the return branch pipe connected and disconnect the parallel branch pipe.

[0018] Furthermore, the preset water flow value is a critical value of the water flow in the return branch pipe reaching the start-up flow of the gas water heater body due to water use at the cold water end of the external water use point.

[0019] A pipeline control method for a gas water heater, which uses the pipeline system of the gas water heater, comprises the following steps:

[0020] S100: The controller receives water flow information detected by the water flow sensor;

[0021] S101: Determine whether the water flow information is greater than or equal to a preset water flow value. If so, control the electric water valve to disconnect the water return branch pipe; if not, control the electric water valve to keep the water return branch pipe connected.

[0022] Furthermore, the preset water flow value is a critical value of the water flow in the return branch pipe reaching the start-up flow of the gas water heater body due to water use at the cold water end of the external water use point.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] The controller of the present invention controls the pipeline control component by detecting the water flow at the cold water end of the external water use point through a water flow sensor, effectively preventing the water flow in the return water branch pipe from reaching the starting flow of the gas water heater body due to water use at the cold water end of the external water use point, thereby preventing the gas water heater body from starting up incorrectly, and at the same time solves the noise problem caused by the false start of the gas water heater body and the problem that the frequent false start of the gas water heater body affects its own life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a first embodiment of a pipeline control assembly of a pipeline system of a gas water heater according to the present invention;

[0026] Figure 2 It is a schematic diagram of a second embodiment of a pipeline control component of a pipeline system of a gas water heater of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the constant pressure valve of the present invention;

[0028] Figure 4 This is one of the flow charts of a pipeline control method for a gas water heater of the present invention;

[0029] Figure 5 This is the second flow chart of a pipeline control method for a gas water heater of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of the technical solution for which protection is requested by the present invention.

[0031] like Figure 1-3 As shown, a piping system of a gas water heater includes a gas water heater body 1, a return pump 2, a temperature sensor 3, a return branch pipe 4, and a one-way valve 5 arranged on the return branch pipe 4, wherein the return pump 2 and the temperature sensor 3 are both arranged on the water inlet pipe of the gas water heater body 1, and the return branch pipe 4 is used to connect the external hot water pipe and cold water pipe of the gas water heater body 1 to form a return pipe, and further includes:

[0032] A water flow sensor 6, which is arranged on the cold water end of the external water point, and the water flow sensor 6 is used to detect the water flow at the cold water end of the external water point;

[0033] A pipeline control component 7, which is arranged on the water return branch pipe 4, and is used to prevent the water flow in the water return branch pipe 4 from reaching the starting flow of the gas water heater body 1 due to water use at the cold water end of the external water point;

[0034] The controller is electrically connected to the water flow sensor 6 and the pipeline control component 7 respectively, and the controller is used to control the pipeline control component 7 according to the water flow information detected by the water flow sensor 6.

[0035] The water flow rate at the cold water end of the external water use point is detected by the water flow sensor 6 to control the pipeline control component 7, which effectively prevents the water flow in the return branch pipe 4 from reaching the starting flow of the gas water heater body 1 due to the water use at the cold water end of the external water use point, thereby preventing the gas water heater body 1 from starting up incorrectly, and at the same time solves the noise problem caused by the false start of the gas water heater body 1 and the problem that the frequent false start of the gas water heater body 1 affects its own life.

[0036] Embodiment 1 of the pipeline control assembly 7 of the present invention comprises an electric three-way water valve 70 arranged on the water return branch 4, two passages of the electric three-way water valve 70 are connected to the water return branch 4, a parallel branch 71 is arranged between the other passage of the electric three-way water valve 70 and the water return branch 4, a constant pressure valve 72 is arranged on the parallel branch 71, when the water flow sensor 6 detects that the water flow is greater than or equal to the preset water flow value, the information is fed back to the controller, and the controller controls the electric three-way water valve 70 to connect the water return branch 4 with the parallel branch 71, so that After the water flows from the electric three-way water valve 70 into the parallel branch pipe 71 and flows through the constant pressure valve 72, it flows into the return branch pipe 4. The constant pressure valve 72 can ensure that the water flow rate through the return branch pipe 4 is less than the starting flow rate of the gas water heater body 1, thereby preventing the gas water heater body 1 from being started incorrectly due to water use at the cold water end of the external water point; when the water flow sensor 6 detects that the water flow rate is less than the preset water flow rate value, the electric three-way water valve 70 keeps the return branch pipe 4 connected and disconnects the parallel branch pipe 71. At this time, it can be ensured that the gas water heater body 1 is not affected by the current limiting of the constant pressure valve 72 when circulating in the water circuit.

[0037] The working principle of the constant pressure valve 72 is as follows:

[0038] When the water inlet flow rate increases (pressure increases), the first inner core 721 compresses the spring 722 under the action of water pressure, thereby tightening the valve port 720. At this time, the internal pressure of the constant pressure valve 72 increases, and the second inner core 723 tightens the valve port at the water inlet end under the influence of the internal pressure, and the first inner core 721 is reset by the spring 722, ultimately ensuring that the output water pressure is constant (the flow rate is basically constant) and the output flow rate is ≤ the starting flow rate of the gas water heater body 1.

[0039] The controller of the present invention is respectively connected to the water flow sensor 6 and the electric three-way water valve 70 by wireless or wired connection.

[0040] Embodiment 2 of the pipeline control component 7 of the present invention includes an electric water valve 73 arranged on the return branch pipe 4. When the water flow sensor 6 detects that the water flow is greater than or equal to a preset water flow value, the information is fed back to the controller, and the controller controls the electric water valve 73 to disconnect the return branch pipe 4 to prevent the gas water heater body 1 from being mistakenly started due to water use at the cold water end of the external water point. When the water flow sensor 6 detects that the water flow is less than the preset water flow value, the electric water valve 73 keeps the return branch pipe 4 connected, and the circulating water circuit in the gas water heater body 1 can be guaranteed to be connected.

[0041] The controller of the present invention is respectively connected to the water flow sensor 6 and the electric water valve 73 by radio or wired connection.

[0042] The external water point described in the present invention is a flush toilet. Since the water volume of a flush toilet is relatively large, the instantaneous water volume during flushing may exceed 25L / min to reach 30L / min. Therefore, the water flow sensor 6 mainly detects the water flow at the cold water end of the flush toilet. Similarly, if there are other water points with large water consumption, a water flow sensor must also be installed at the cold water end to detect the water flow there.

[0043] like Figure 4 As shown, a pipeline control method for a gas water heater is applied to the pipeline system of the gas water heater, and the control method comprises the following steps:

[0044] S1: The controller receives the water flow information detected by the water flow sensor 6;

[0045] S2: Determine whether the water flow information is greater than or equal to a preset water flow value. If so, control the electric three-way water valve 70 to connect the return branch pipe 4 with the parallel branch pipe 71; if not, control the electric three-way water valve 70 to keep the return branch pipe 4 connected and disconnect the parallel branch pipe 71. When the water flow sensor 6 detects that the water flow is greater than or equal to the preset water flow value, the information is fed back to the controller, and the controller controls the electric three-way water valve 70 to connect the return branch pipe 4 with the parallel branch pipe 71, so that the water flows from the electric three-way water valve 70. After entering the parallel branch pipe 71 and flowing through the constant pressure valve 72, it flows into the return branch pipe 4. The constant pressure valve 72 can ensure that the water flow rate passing through the return branch pipe 4 is less than the starting flow rate of the gas water heater body 1, thereby preventing the gas water heater body 1 from being started incorrectly due to water use at the cold water end of the external water point; when the water flow sensor 6 detects that the water flow rate is less than the preset water flow rate value, the electric three-way water valve 70 keeps the return branch pipe 4 connected and disconnects the parallel branch pipe 71. At this time, it can be ensured that the gas water heater body 1 is not affected by the current limiting of the constant pressure valve 72 when circulating in the water circuit.

[0046] The preset water flow value of the present invention is the critical value of the water flow in the return branch pipe 4 reaching the starting flow of the gas water heater body 1 due to the water use at the cold water end of the external water point. For example, through actual calculation and measurement, it can be known that under a pipe length of 15 meters, when the total flow through the flush toilet is ≤8L / min, the gas water heater basically does not start. When the total flow is ≥8L / min, the water heater will reach the starting flow of the gas water heater, and the water heater will start automatically. Therefore, under a pipe length of 15 meters, 8L / min is the preset water flow value, and the preset water flow value can be adjusted according to the actual size.

[0047] like Figure 5 As shown, a pipeline control method for a gas water heater is applied to the pipeline system of the gas water heater, and the control method comprises the following steps:

[0048] S100: The controller receives water flow information detected by the water flow sensor 6;

[0049] S101: Determine whether the water flow information is greater than or equal to a preset water flow value. If so, control the electric water valve 73 to disconnect the return branch pipe 4; if not, control the electric water valve 73 to keep the return branch pipe 4 connected. When the water flow sensor 6 detects that the water flow is greater than or equal to the preset water flow value, the information is fed back to the controller, and the controller controls the electric water valve 73 to disconnect the return branch pipe 4 to prevent the gas water heater body 1 from being started accidentally due to water use at the cold water end of the external water point. When the water flow sensor 6 detects that the water flow is less than the preset water flow value, the electric water valve 73 keeps the return branch pipe 4 connected, and the circulation water circuit in the gas water heater body 1 can be guaranteed to be connected.

[0050] The preset water flow value of the present invention is the critical value of the water flow in the return branch pipe 4 reaching the starting flow of the gas water heater body 1 due to the water use at the cold water end of the external water point. For example, through actual calculation and measurement, it can be known that under a pipe length of 15 meters, when the total flow through the flush toilet is ≤8L / min, the gas water heater basically does not start. When the total flow is ≥8L / min, the water heater will reach the starting flow of the gas water heater, and the water heater will start automatically. Therefore, under a pipe length of 15 meters, 8L / min is the preset water flow value, and the preset water flow value can be adjusted according to the actual size.

[0051] The specific implementation methods described above provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above is only the most preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, supplements and equivalent substitutions made within the scope of the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pipeline control method for a gas water heater, characterized in that: The invention comprises a pipeline system of a gas water heater, the pipeline system comprising a gas water heater body (1), a return pump (2), a temperature sensor (3), a return branch pipe (4), and a one-way valve (5) arranged on the return branch pipe (4), the return pump (2) and the temperature sensor (3) are both arranged on the water inlet pipe of the gas water heater body (1), the return branch pipe (4) is used to connect the external hot water pipe and cold water pipe of the gas water heater body (1) to form a return pipe, and the pipeline system also comprises: A water flow sensor (6), which is arranged on the cold water end of the external water point and is used to detect the water flow at the cold water end of the external water point; A pipeline control assembly (7) is arranged on the water return branch pipe (4) and is used to prevent the water flow in the water return branch pipe (4) from reaching the start-up flow of the gas water heater body (1) due to water use at the cold water end of an external water point, wherein the pipeline control assembly (7) comprises an electric three-way water valve (70) arranged on the water return branch pipe (4), two passages of the electric three-way water valve (70) are connected to the water return branch pipe (4), a parallel branch pipe (71) is arranged between the other passage of the electric three-way water valve (70) and the water return branch pipe (4), and a constant pressure valve (72) is arranged on the parallel branch pipe (71); a controller, which is electrically connected to the water flow sensor (6) and the pipeline control component (7), respectively, and is used to control the pipeline control component (7) according to water flow information detected by the water flow sensor (6); The control method comprises the following steps: S1: The controller receives water flow information detected by the water flow sensor (6); S2: Determine whether the water flow information is greater than or equal to a preset water flow value; if so, control the electric three-way water valve (70) to connect the return branch pipe (4) with the parallel branch pipe (71); if not, control the electric three-way water valve (70) to keep the return branch pipe (4) connected and disconnect the parallel branch pipe (71).

2. The pipeline control method of the gas water heater according to claim 1, characterized in that: The preset water flow value is a critical value of the start-up flow of the gas water heater body (1) caused by water use at the cold water end of the external water use point, which causes the water flow in the return branch pipe (4) to reach the start-up flow of the gas water heater body (1).

3. The pipeline control method of the gas water heater according to claim 1 or 2, characterized in that: The controller is respectively connected to the water flow sensor (6) and the electric three-way water valve (70) by wireless or wired connection.

4. The pipeline control method of the gas water heater according to claim 1 or 2, characterized in that: The external water point is a flush toilet.

5. A pipeline control method for a gas water heater, characterized in that: The invention comprises a pipeline system of a gas water heater, the pipeline system comprising a gas water heater body (1), a return pump (2), a temperature sensor (3), a return branch pipe (4), and a one-way valve (5) arranged on the return branch pipe (4), the return pump (2) and the temperature sensor (3) are both arranged on the water inlet pipe of the gas water heater body (1), the return branch pipe (4) is used to connect the external hot water pipe and cold water pipe of the gas water heater body (1) to form a return pipe, and the pipeline system also comprises: A water flow sensor (6), which is arranged on the cold water end of the external water point and is used to detect the water flow at the cold water end of the external water point; a pipeline control assembly (7) arranged on the water return branch pipe (4) and used to prevent the water flow in the water return branch pipe (4) from reaching the start-up flow of the gas water heater body (1) due to water use at the cold water end of an external water point, wherein the pipeline control assembly (7) comprises an electric water valve (73) arranged on the water return branch pipe (4); a controller, which is electrically connected to the water flow sensor (6) and the pipeline control component (7), respectively, and is used to control the pipeline control component (7) according to water flow information detected by the water flow sensor (6); The control method comprises the following steps: S100: The controller receives water flow information detected by the water flow sensor (6); S101: Determine whether the water flow information is greater than or equal to a preset water flow value; if so, control the electric water valve (73) to disconnect the water return branch pipe (4); if not, control the electric water valve (73) to keep the water return branch pipe (4) connected.

6. The pipeline control method of the gas water heater according to claim 5, characterized in that: The preset water flow value is a critical value of the start-up flow of the gas water heater body (1) caused by water use at the cold water end of the external water use point, which causes the water flow in the return branch pipe (4) to reach the start-up flow of the gas water heater body (1).

7. The pipeline control method for a gas water heater according to claim 5 or 6, characterized in that: The controller is respectively connected to the water flow sensor (6) and the electric water valve (73) by radio or wire.

8. The pipeline control method of a gas water heater according to claim 5 or 6, characterized in that: The external water point is a flush toilet.

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