Residual water removal system, device, method of heat exchanger and gas water heater

Abstract

The present invention provides a residual water removal system, device, method and gas water heater for a heat exchanger. The residual water removal system of the heat exchanger includes: a drain valve provided at the water inlet and / or the water outlet of the heat exchanger; a blowing system connected to the water inlet or the water outlet of the heat exchanger; a combustion system provided with an exhaust pipe, and the exhaust pipe is connected to the blowing system; a controller communicatively connected to the blowing system and the drain valve respectively. The controller is adapted to obtain the opening time of the drain valve, so that the controller starts the blowing system to blow air into the inner water pipe of the heat exchanger after the first time the drain valve is opened. The residual water removal system, device, method and gas water heater of the heat exchanger can accelerate the discharge of moisture in the heat exchanger by starting the blowing system to blow hot air into the heat exchanger after the first time the drain valve is opened, so that there is no residual water inside the heat exchanger, thereby achieving the anti-freezing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly to a residual water removal system, device, method for a heat exchanger and a gas water heater. Background Art

[0002] A gas water heater is a relatively common household appliance.

[0003] When using a gas water heater in winter or cold regions, since there is still water remaining in the heat exchanger after closing the valve, in order to prevent the heat exchanger from cracking due to freezing, anti-freezing measures need to be taken for the heat exchanger.

[0004] Currently, there are two anti-freezing methods for heat exchangers: one is to add electric heating rods at the inlet pipe, outlet pipe and coil of the exchanger. When it is detected that the water temperature in the heat exchanger is close to 0°C, the electric heating rods are started to heat, so that the water remaining in the inner water pipe of the heat exchanger is always in a liquid state above 0°C. The other is when the water in the pipeline is close to 0°C, the water in the pipeline is circulated by a water pump and the water heater is ignited and heated, which can also keep the water in the inner water pipe in a liquid state above 0°C.

[0005] In the above anti-freezing methods, there is always water in the inner water pipe of the heat exchanger and the water is heated to achieve the anti-freezing effect. However, if the electric heating or the water pump fails, it is inevitable that the heat exchanger of the water heater will be frozen and cracked. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the technical defect that the heat exchanger is prone to cracking at low temperatures in the prior art, so as to provide a residual water removal system for a heat exchanger that can prevent cracking.

[0007] To solve the above technical problem, a residual water removal system for a heat exchanger provided by the present invention includes: a drain valve provided at the inlet and / or outlet of the heat exchanger; a blowing system connected to the inlet or outlet of the heat exchanger; a controller communicatively connected to the blowing system and the drain valve respectively, and the controller is adapted to obtain the opening time of the drain valve, so that the controller starts the blowing system to blow air into the inner water pipe of the heat exchanger after the drain valve is opened for a first time.

[0008] Optionally, the blowing system includes: a blower including a motor, the blower is provided with a blowing port and an air inlet, and the air inlet is connected to the exhaust pipe of the combustion system; a blowing pipe connected to the blowing port of the blower and the inlet or outlet of the heat exchanger; wherein, the combustion system is adapted to heat the heat exchanger, and the controller is communicatively connected to the motor.

[0009] Optionally, the blowing system further includes: a one-way valve disposed on the blowing pipe; wherein, the air outlet of the blower blows air through the one-way valve to the water inlet or the water outlet of the heat exchanger.

[0010] Optionally, the residual water removal system of the heat exchanger further includes: a first temperature sensor adapted to detect the temperature of the water inlet of the heat exchanger and send a first temperature signal; a second temperature sensor adapted to detect the temperature of the water outlet of the heat exchanger and send a second temperature signal; wherein, the first temperature sensor and the second temperature sensor are respectively communicatively connected to the controller, and the controller controls the power of the blower according to the lowest temperature among the first temperature signal and the second temperature signal.

[0011] Optionally, the residual water removal system of the heat exchanger further includes: a water flow sensor adapted to detect the water flow rate entering the heat exchanger and send a water flow rate signal; wherein, the controller is also communicatively connected to the water flow sensor, and the controller controls the opening of the drain valve according to the water flow rate signal sent by the water flow sensor to remove the residual water from the heat exchanger.

[0012] Optionally, the drain valve includes: a first drain valve, the water inlet of the first drain valve is communicated with the water inlet of the heat exchanger; a second drain valve, the water inlet of the second drain valve is communicated with the water outlet of the heat exchanger.

[0013] Therefore, the technical problem to be solved by the present invention is to overcome the technical defect that the heat exchanger is prone to freeze and crack at low temperatures in the prior art, so as to provide a residual water control device for a heat exchanger that can prevent freeze and crack.

[0014] To solve the above technical problem, a residual water control device for a heat exchanger provided by the present invention includes: an acquisition module adapted to acquire the opening time of the drain valve; a judgment module communicatively connected to the acquisition module, the judgment module is adapted to judge whether the opening time of the drain valve reaches a first time; a control module communicatively connected to the judgment module, the control module is adapted to start the blowing system to blow air into the inner water pipe of the heat exchanger after the opening time of the drain valve reaches the first time.

[0015] Therefore, the technical problem to be solved by the present invention is to overcome the technical defect that the heat exchanger is prone to freeze and crack at low temperatures in the prior art, so as to provide a gas water heater that can prevent the heat exchanger from freezing and cracking.

[0016] To solve the above technical problem, a gas water heater provided by the present invention includes: a heat exchanger; the residual water removal system of the heat exchanger according to any one of the above, and the residual water removal system of the heat exchanger is adapted to remove the residual water in the inner water pipe of the heat exchanger.

[0017] Optionally, the gas water heater further includes: a combustion system provided with an exhaust pipe, and the combustion system is adapted to heat the heat exchanger; wherein, the exhaust pipe is connected to the blowing system of the water removal system of the heat exchanger.

[0018] Therefore, the technical problem to be solved by the present invention is to overcome the technical defect that the heat exchanger is prone to freeze and crack at low temperatures in the prior art, so as to provide a method for removing residual water from the heat exchanger.

[0019] To solve the above technical problem, a method for removing residual water from a heat exchanger provided by the present invention includes:

[0020] Obtain the opening time of the drain valve; when the time for opening the drain valve reaches the first time, start the blowing system to blow air into the inner water pipe of the heat exchanger.

[0021] Optionally, the method for removing residual water from the heat exchanger further includes: closing the drain valve after starting the blowing system to blow air into the inner water pipe of the heat exchanger; when the closing of the drain valve reaches the third time, start the drain valve again.

[0022] Optionally, the method for removing residual water from the heat exchanger further includes: obtaining a first temperature signal at the water inlet of the heat exchanger and a second temperature signal at the water outlet of the heat exchanger; controlling the power of the fan of the blowing system according to the lowest temperature of the first temperature signal and the second temperature signal.

[0023] Optionally, before obtaining the opening time of the drain valve, it further includes: obtaining a water flow signal entering the heat exchanger; controlling the opening of the drain valve according to the water flow signal to remove residual water from the heat exchanger.

[0024] Therefore, the technical problem to be solved by the present invention is to overcome the technical defect that the heat exchanger is prone to freeze and crack at low temperatures in the prior art, so as to provide a computer-readable storage medium.

[0025] To solve the above technical problem, a computer-readable storage medium provided by the present invention stores a computer program, and when the computer program is executed by a processor, it implements the method for controlling the removal of residual water from the heat exchanger as described in any one of the above.

[0026] The technical solution of the present invention has the following advantages:

[0027] 1. The residual water removal system of the heat exchanger provided by the present invention can obtain the opening time of the drain valve through the controller, and then start the blowing system to blow air into the heat exchanger immediately after the drain valve is opened, so as to accelerate the discharge of the water in the heat exchanger, so that there is no residual water inside the heat exchanger, and thus the antifreeze effect can be achieved.

[0028] 2. In the residual water removal system of the heat exchanger provided by the present invention, the fan of the blowing system is connected to the smoke exhaust pipeline, so that the blowing system can blow high-temperature hot air into the heat exchanger, which can further accelerate the discharge of the residual water in the heat exchanger.

[0029] 3. In the residual water removal system of the heat exchanger provided by the present invention, a drain valve is respectively provided on the water supply pipe and the water outlet pipe, so that drainage can be realized at both the water inlet and the water outlet of the heat exchanger, and thus the residual water in the heat exchanger can be fully removed.

[0030] 4. In the residual water removal system of the heat exchanger provided by the present invention, the lower water temperature detected by the first temperature sensor and the second temperature sensor is sent to the controller, and the controller adjusts the power of the fan through the relationship table of the fan power and the water temperature information stored inside, so that the residual water in the water pipe can be blown out faster.

[0031] 5. In the residual water removal system of the heat exchanger provided by the present invention, when the second time is reached after the drain valve is opened, the blowing system is closed.

[0032] 6. In the residual water removal method of the heat exchanger provided by the present invention, after starting the blowing system, the drain valve is closed, and the drain valve is opened again after the third time when the drain valve is closed, so that the pressure in the inner water pipe of the heat exchanger gradually increases, and the residual water can be blown out faster.

[0033] 7. In the gas water heater provided by the present invention, drainage is carried out through the drain valve, and blowing is carried out through the blowing system immediately after the drain valve is opened, which can ensure that there is no residual water in the heat exchanger and ensure the service life of the gas water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 It is a schematic structural diagram of the residual water removal system of the heat exchanger provided by an embodiment of the present invention when the heat exchanger is in the working state;

[0036] Figure 2 Schematic diagram of the residual water removal system of the heat exchanger provided by an embodiment of the present invention when the heat exchanger stops working;

[0037] Figure 3 Composition schematic diagram of the residual water removal device of the heat exchanger provided by an embodiment of the present invention;

[0038] Figure 4 Flowchart of the residual water removal method of the heat exchanger provided by an embodiment of the present invention;

[0039] Figure 5 Flowchart of the residual water removal method of the heat exchanger provided by another embodiment of the present invention;

[0040] Figure 6 Flowchart of the residual water removal method of the heat exchanger provided by still another embodiment of the present invention;

[0041] Figure 7 Flowchart of the residual water removal method of the heat exchanger provided by yet another embodiment of the present invention.

[0042] Explanation of reference numerals:

[0043] 1 - inlet valve; 2 - outlet valve; 31 - first drain valve; 32 - second drain valve; 41 - first temperature sensor; 42 - second temperature sensor; 5 - heat exchanger; 6 - water flow sensor; 7 - controller; 8 - fan; 9 - check valve; A is the water flow direction; B and C are the water flow directions under the action of the fan respectively; a, b, and c are the connection nodes of each water path. Detailed embodiments

[0044] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "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 be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] Embodiment 1

[0049] As Figure 1 and Figure 2 shown, a system for removing residual water from a heat exchanger includes a drain valve, a blowing system, and a controller 7. The drain valve is provided at the water inlet and / or outlet of the heat exchanger 5. The blowing system is connected to the water inlet or outlet of the heat exchanger 5. The controller 7 is respectively communicatively connected to the blowing system and the drain valve. The controller 7 is adapted to obtain the opening time of the drain valve, so that the controller 7 starts the blowing system to blow air into the inner water pipe of the heat exchanger 5 after the drain valve is opened for the first time.

[0050] The inner water pipe of the above-mentioned heat exchanger 5 is the heat exchange water pipe inside the heat exchanger 5. After the combustion system is closed, the controller 7 can obtain the closing time of the combustion system. Since the heat exchanger 5 is still in a high-temperature state when the combustion system stops working, this hot water pipe can evaporate and dry the residual water in the pipe and discharge the residual water through the drain valve. Therefore, after the combustion system is closed, the drain valve is started, and after the drain valve is opened for the first time, there is still undrained water in the water pipe. At this time, the blowing system is started to blow air into the water inlet or outlet of the heat exchanger 5. Under the action of the blowing system, the residual water in the inner water pipe of the heat exchanger 5 can be blown away.

[0051] Take Figure 2 shown as an example where the blowing system is arranged in the pipeline between the water inlet and outlet of the heat exchanger 5. When the blowing system blows air, the water flow is divided into two directions C and B and flows out of the pipeline at point a.

[0052] The first time reached after the above-mentioned pressure relief valve is activated is the time for the first drainage of the remaining water through the pressure relief valve. After the first time for the first drainage of the remaining water through the pressure relief valve, for example, 15 seconds later, there is still remaining water in the water pipe. Then, start the blowing system to blow air at the water inlet or outlet of the heat exchanger 5. Under the action of the blowing system, the remaining water is discharged through the pressure relief valve again, so that there is no residual water in the heat exchanger 5. Of course, as an alternative embodiment, the first time can also be 0, that is, after the combustion system is turned off, the pressure relief valve is opened, and at the same time, the blowing system is started to blow air at the water inlet or outlet of the heat exchanger 5, so as to remove the remaining water in the water pipe. Among them, the working time of the blowing system is the second time, for example, 5 minutes. After the second time, the blowing system and the drain valve can be closed.

[0053] Furthermore, the blowing system includes: a blower 8 and a blowing pipe. The blower 8 includes a motor. The blower 8 is provided with a blowing port and an air inlet. The air inlet is connected to the smoke exhaust pipeline of the combustion system. The blowing pipe is connected to the blowing port of the blower 8 and the water inlet or outlet of the heat exchanger 5; among them, the combustion system is adapted to heat the heat exchanger 5, and the controller 7 is communicatively connected to the motor.

[0054] The above-mentioned blower 8 blows air into the heat exchanger 5 through the blowing pipe. Among them, the blowing pipe is connected to the water outlet pipe connected to the water outlet. The blowing system can be arranged downstream of the smoke flow direction in the smoke exhaust pipeline, that is, the blowing system can utilize the high-temperature flue gas in the smoke exhaust pipeline to blow high-temperature hot air at the water inlet or outlet of the heat exchanger 5; it can also be arranged upstream of the smoke flow direction in the smoke exhaust pipeline, that is, the blowing system utilizes the air at the air inlet of the blower to blow room-temperature air at the water inlet or outlet of the heat exchanger 5.

[0055] When the blower 8 is arranged downstream of the smoke flow direction in the smoke exhaust pipeline, after the combustion system is turned off, the blower 8 is still under the action of the high-temperature flue gas. The blower 8 can blow high-temperature hot air at the water inlet or outlet of the heat exchanger 5. The hot air can not only blow the water flow in the inner water pipe of the heat exchanger 5 out of the heat exchanger 5, but also has the effect of drying the residual moisture in the inner water pipe of the heat exchanger 5, accelerating the discharge of the moisture.

[0056] Furthermore, the blowing system further includes: a check valve 9. The check valve 9 is arranged on the blowing pipe. The check valve 9 is communicated with the water inlet or outlet of the heat exchanger 5; among them, the blowing port of the blower 8 blows air at the water inlet or outlet of the heat exchanger 5 through the check valve 9.

[0057] The above-mentioned check valve 9 is in a closed state when the heat exchanger 5 is in a heating state, which can prevent water from entering the blower.

[0058] Further, the residual water removal system of the heat exchanger further includes: a first temperature sensor 41 and a second temperature sensor 42. The first temperature sensor 41 is adapted to detect the temperature of the water inlet of the heat exchanger 5 and send a first temperature signal. The second temperature sensor 42 is adapted to detect the temperature of the water outlet of the heat exchanger 5 and send a second temperature signal. Wherein, the first temperature sensor 41 and the second temperature sensor 42 are respectively communicatively connected to the controller 7, and the controller 7 controls the power of the blower 8 according to the lowest temperature in the first temperature signal and the second temperature signal.

[0059] When the water heater stops working, as the temperature of the heat exchanger 5 decreases, if there is residual water in the pipe, the temperature will also decrease accordingly. According to the relationship between water temperature and specific gravity, the lower the temperature, the higher the density, that is, the heavier the water. If there is residual water in the heat exchanger 5 that needs to be blown out by the blower, the power of the blower needs to be increased. At this time, the first temperature sensor 41 and the second temperature sensor 42 respectively feedback the water temperature signal to the controller 7 of the main control board. The controller 7 controls the power of the blower 8 according to the lowest temperature data among them, so that there is a relationship between the water temperature and the power of the blower 8. As the temperature of the heat exchanger 5 decreases, the water temperature also decreases, and the power of the blower 8 continues to increase until the residual water in the heat exchanger 5 is blown out.

[0060] The following is the comparison of the relationship between water temperature and specific gravity within the temperature range covered by the water heater:

[0061] 0°C...........0.9998 (coexistence state of water and ice)

[0062] 5°C...........0.9999

[0063] 10°C...........0.9994

[0064] 15°C...........0.9988

[0065] 20°C...........0.9980

[0066] 25°C...........0.9968

[0067] 30°C...........0.9955

[0068] 35°C...........0.9939

[0069] 40°C...........0.9922

[0070] 45°C...........0.9902

[0071] 50°C...........0.9880

[0072] 55°C...........0.9857

[0073] 60°C...........0.9833

[0074] 65 °C............ 0.9806

[0075] 70 °C............ 0.9779

[0076] 75 °C............ 0.9749

[0077] 80 °C............ 0.9719

[0078] 85 °C............ 0.9687

[0079] 90 °C............ 0.9654

[0080] 95 °C............ 0.9620

[0081] 100 °C.......... 0.9584

[0082] Thus, the lower the temperature, the greater the density and the viscosity. Therefore, the resistance of the remaining water flowing out of the pipeline is also greater. By sending the lower water temperature detected by the first temperature sensor 41 and the second temperature sensor 42 to the controller 7, the controller 7 adjusts the power of the blower 8 according to the relationship table of the blower 8 power and the water temperature information stored internally, so that the remaining water in the water pipe can be blown out faster.

[0083] The main control board of the controller 7 controls the drain valve to close, and the boiled water can be used directly next time. This fundamentally eliminates the existence of the remaining water in the pipe and essentially solves the possibility of the heat exchanger 5 being frozen and cracked in winter.

[0084] Furthermore, the remaining water removal system of the heat exchanger further includes: a water flow sensor 6, which is adapted to detect the water flow rate entering the heat exchanger 5 and send a water flow rate signal. Among them, the controller 7 is communicatively connected to the water flow sensor 6, and the controller 7 controls the drain valve to open to remove the remaining water from the heat exchanger 5 according to the water flow rate signal sent by the water flow sensor 6.

[0085] The opening of the above-mentioned drain valve is synchronized with the closing of the combustion system. Therefore, the closing time of the combustion system is the opening time of the drain valve. The controller 7 can obtain the water flow rate signal entering the heat exchanger 5. The controller 7 judges the water flow rate signal. When the water flow rate signal indicates no water flow, it means that the water supply to the heat exchanger 5 has stopped. At this time, the controller 7 can control the heat exchanger 5 to stop heating, control the water heater to close, and then control the drain valve to open to remove the remaining water from the heat exchanger 5, so that there is no residual water inside the heat exchanger 5, thus achieving the anti-freezing effect. The opening time of the drain valve can be obtained through the main control board of the controller 7. When the first time is reached after the drain valve is opened, the blowing system is started to blow air into the inner water pipe of the heat exchanger. When the second time is reached after the drain valve is opened, the blowing system is closed.

[0086] Further, the drain valve includes a first drain valve 31 and a second drain valve 32. The water inlet of the first drain valve 31 is communicated with the water inlet of the heat exchanger 5, and the water inlet of the second drain valve 32 is communicated with the water outlet of the heat exchanger 5.

[0087] The water inlet of the first drain valve 31 is connected to the water supply pipe, such as Figure 2 at the node b shown, and the water inlet of the second drain valve 32 is connected to the water outlet pipe, such as Figure 2 at the node C shown. One end of the water supply pipe is connected to the water inlet of the heat exchanger 5, and one end of the water outlet pipe is connected to the water outlet of the heat exchanger 5. The water flow sensor 6 is arranged on the water supply pipeline to detect the water flow rate flowing out of the water inlet valve 1.

[0088] The above-mentioned residual water removal system further includes: a water supply pipe, a water outlet pipe, a water inlet valve 1 and a water outlet valve 2. One end of the water supply pipe is connected to the water inlet of the heat exchanger 5, and the other end of the water supply pipe is the water inlet end. One end of the water outlet pipe is connected to the water outlet of the heat exchanger 5, and the other end of the water outlet pipe is the water outlet pipe. The water inlet valve 1 is arranged at the water inlet end, and the water outlet valve 2 is arranged at the water outlet end. Among them, the water flow sensor 6 is arranged on the water supply pipeline to detect the water flow rate flowing out of the water inlet valve 1. The water inlet valve 1 is used for water inlet, and the water outlet valve 2 is used for water outlet. When the heat exchanger is in the working state, the pressure relief valve is closed, the water inlet valve 1 is opened, the water flow sensor 6 at the water inlet end senses the water flow signal, and then transmits this signal to the controller 7. The controller 7 starts the igniter to ignite, the heat exchanger 5 is heated, the cold water reaches the heat exchanger 5 through the water inlet pipe and then flows out through the water outlet valve 2, and the water flows in the direction A, as Figure 1 shown.

[0089] When the heat exchanger 5 stops heating and the water heater stops working, domestic hot water is no longer used in this state. After the water outlet valve 2 is closed and the water inlet valve 1 is also closed, then, there is still some residual water remaining between the water inlet valve 1 and the water outlet valve 2 in the water circuit, and the water flow sensor 6 cannot sense the water flow signal. The controller 7 will open the drain valve, and the residual water will flow out from the drain valve in the arrow direction. By providing a drain valve on each of the water supply pipe and the water outlet pipe, drainage can be achieved at both the water inlet and the water outlet of the heat exchanger 5, so that the residual water in the heat exchanger 5 can be fully removed.

[0090] Furthermore, the water inlet of the first drain valve 31 is communicated with the water outlet of the water flow sensor 6.

[0091] The above-mentioned first drain valve 31 can be connected in parallel with the water flow sensor 6. The water inlet of the first drain valve 31 and the water outlet of the water flow sensor 6 are both connected to the connection point 13 on the water path, so that the water inlet of the first drain valve 31 is communicated with the water outlet of the water flow sensor 6. When the water inlet valve 1 is closed, water will flow to the water inlet of the first drain valve 31 and then flow out through the first drain valve 31.

[0092] Furthermore, the water inlet of the second drain valve 32 is communicated with the water inlet of the water outlet valve 2.

[0093] The above-mentioned second drain valve 32 can be connected in parallel with the water outlet valve 2. The water inlet of the second drain valve 32 and the water inlet of the water outlet valve 2 are both connected to the connection point 11 on the water path, so that the water inlet of the second drain valve 32 is communicated with the water inlet of the water outlet valve 2. When the water outlet valve 2 is closed, water will flow to the water inlet of the second drain valve 32 and then flow out through the second drain valve 32.

[0094] Furthermore, the heights of both the water inlet valve 1 and the water outlet valve 2 are lower than the height of the inner water pipe of the heat exchanger 5.

[0095] When the heights of both the water inlet valve 1 and the water outlet valve 2 are lower than the height of the inner water pipe of the heat exchanger 5, under the action of gravity, the residual water in the inner water pipe of the heat exchanger 5 will flow to the water inlet valve 1 and the water outlet valve 2 respectively, accelerating the water flow rate. Since the water inlet end and the water outlet end are closed, the residual water in the inner water pipe of the heat exchanger 5 will flow to the first drain valve 31 and the second drain valve 32 respectively more quickly, which can ensure that the water remaining in the heat exchanger 5 can be reduced more quickly within a certain period of time.

[0096] The controller 7 controls the drain valve to close, and when using it next time, just turn on the water to use.

[0097] Therefore, the existence of residual water in the pipe can be fundamentally eliminated, and the problem that the heat exchanger 5 is prone to freeze and crack when used in winter or cold regions is solved.

[0098] Embodiment 2

[0099] As Figure 3 shown, a device for controlling the removal of residual water of a heat exchanger includes: an acquisition module 101, a judgment module 102 and a control module 103. The acquisition module 101 is adapted to acquire the opening time of the drain valve. The judgment module 102 is communicatively connected with the acquisition module 101, and the judgment module 102 is adapted to judge whether the opening time of the drain valve reaches a first time. The control module 103 is communicatively connected with the judgment module 102, and the control module 103 is adapted to start the blowing system to blow air to the inner water pipe of the heat exchanger 5 after the opening time of the drain valve reaches the first time.

[0100] In addition, the acquisition module 101 is also adapted to acquire the water flow signal entering the heat exchanger 5. The judgment module 102 is communicatively connected to the acquisition module 101, and the judgment module 102 is also adapted to judge whether there is water flow. The control module 103 is communicatively connected to the judgment module 102. Wherein, when the judgment module 102 judges that there is no water flow, the control module 103 is adapted to control the water heater to shut down and control the drain valve to open to remove the remaining water from the heat exchanger 5.

[0101] Embodiment 3

[0102] A gas water heater includes: a heat exchanger 3 and a remaining water removal system for any one of the heat exchangers. The combustion system of the remaining water removal system of the heat exchanger is adapted to heat the water heater, and the remaining water removal system of the heat exchanger is adapted to remove the remaining water in the inner water pipe of the heat exchanger 3.

[0103] For the above-mentioned gas heat exchanger, the remaining water in the heat exchanger 3 is removed through the remaining water removal system, which can prevent the heat exchanger from cracking due to freezing, thereby improving the service life of the gas heat exchanger. Since the gas heat exchanger includes the remaining water removal system of the heat exchanger, the gas heat exchanger also has the beneficial effects of the remaining water removal system of the heat exchanger, which will not be elaborated here.

[0104] The above-mentioned gas water heater further includes a combustion system. The combustion system is provided with a smoke exhaust pipeline, and the combustion system is adapted to heat the heat exchanger. Wherein, the smoke exhaust pipeline is connected to the blowing system of the remaining water removal system of the heat exchanger. The combustion system is adapted to heat the water tank, and the flue gas generated by the combustion system heating the water tank enters the smoke exhaust pipeline through the smoke inlet of the heat exchanger 5. The smoke exhaust pipeline is arranged in the heat exchanger 5 to exchange heat with the water entering the heat exchanger 5. Under normal conditions of the gas water heater, the speed of smoke exhaust can be accelerated by the blower 8. When the gas water heater is turned off, the blower 8 no longer discharges smoke. At this time, during the process of discharging smoke, the blower 8 is at a relatively high temperature under the action of the high-temperature flue gas. The air outlet of the blower 8 is connected to a blowing pipe, and the blowing pipe is connected to the node a of the water outlet pipe. The node a can be set between the node b and the node c, so that the blower 8 can blow hot air into the water outlet pipe. At this time, if there is still remaining water in the water outlet pipe and the inner water pipe of the heat exchanger 5, under the action of the hot air, the remaining water will flow out in the B direction and the C direction.

[0105] Therefore, when the gas water heater is working, the high-temperature flue gas generated by combustion reaches the blower 8, causing the temperature of the blower 8 to rise, up to more than 150 °C. When the water heater stops working, the air blown by the blower 8 to the pipeline of the heat exchanger 5 is heated by the high temperature of the blower 8 itself, so that the hot air can quickly evaporate and dry the water in the heat exchanger 5.

[0106] When the gas water heater stops working, the heat exchanger 5 is still in a high-temperature state, with a temperature exceeding 200 °C. And due to being wrapped by the housing, the heat exchanger 5 has a slow heat dissipation rate. The heat exchanger 5 in this high-temperature state can evaporate and dry the remaining water in the pipe.

[0107] Embodiment 4

[0108] As Figure 4 shown, a method for removing remaining water from a heat exchanger includes:

[0109] Step S101: Obtain the opening time of the drain valve;

[0110] Step S103: When the opening time of the drain valve reaches the first time, start the blowing system to blow air into the inner water pipe of the heat exchanger 5.

[0111] The above-mentioned first drain is carried out after the drain valve is opened. After the first drain of the drain valve, start the blowing system to blow hot air into the heat exchanger 5, so that all the residual water in the pipeline can flow out. When the second time is reached after the drain valve is opened, turn off the blowing system.

[0112] Further, as Figure 5 shown, the method for removing remaining water from the heat exchanger further includes:

[0113] Step S201: Close the drain valve after starting the blowing system to blow air into the inner water pipe of the heat exchanger 5;

[0114] Step S203: Restart the drain valve after closing the drain valve for the third time.

[0115] The time for closing the drain valve and the time for starting the blowing system can be the same. When the first time is reached after the drain valve is first opened, start the blowing system to blow air into the inner water pipe of the heat exchanger and close the drain valve. Since the blowing system is started and the drain valve is closed after the first time, the blowing system can blow air into the inner water pipe of the heat exchanger 5. At this time, the pressure in the inner water pipe gradually increases. After the opening time of the blowing system reaches the third time, due to the pressure in the inner water pipe, the remaining water can be blown out faster. Among them, the third time can be from 1 second to 10 seconds, and this time value is related to the fan power and is not specifically limited here.

[0116] Further, as Figure 6 shown, before obtaining the opening time of the drain valve, it further includes:

[0117] Step S301: Obtain the water flow signal entering the heat exchanger 5;

[0118] Step S303: Control the opening of the drain valve according to the water flow signal to remove the remaining water from the heat exchanger 5.

[0119] By obtaining the water flow signal entering the heat exchanger 5 and judging the water flow signal, when the water flow signal indicates no water flow, it means that the water supply to the heat exchanger 5 has stopped. At this time, the heat exchanger can be controlled to stop heating, the water heater can be controlled to close, and then the drain valve can be controlled to open to drain the remaining water in the heat exchanger, so that there is no residual water inside the heat exchanger 5, thus achieving the anti-freezing effect.

[0120] Further, as Figure 7 shown, the method for draining the remaining water of the heat exchanger further includes:

[0121] Step S401: Obtain the first temperature signal at the water inlet of the heat exchanger 5 and the second temperature signal at the water outlet of the heat exchanger;

[0122] Step S403: Control the power of the fan of the blowing system according to the lowest temperature of the first temperature signal and the second temperature signal.

[0123] Embodiment 5

[0124] A computer-readable storage medium stores a computer program thereon. When the computer program is executed by a processor, it implements the method for controlling the draining of the remaining water of the heat exchanger according to any one of the above.

[0125] Those skilled in the art can understand that to implement all or part of the processes in the above embodiment methods, it can be completed by instructing relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above embodiment methods of each method. Among them, the storage medium can be a magnetic disk, an optical disc, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (abbreviation: HDD), or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above types of memories.

[0126] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A residual water removal system for a heat exchanger, characterized in that, Including: A drain valve, provided at the water inlet and / or outlet of the heat exchanger (5); A blowing system, connected to the water inlet or outlet of the heat exchanger (5); A controller (7), respectively communicatively connected to the blowing system and the drain valve, the controller (7) being adapted to obtain the opening time of the drain valve, such that the controller (7) starts the blowing system to blow air into the inner water pipe of the heat exchanger (5) after the drain valve has been opened for a first period of time; The blowing system includes: A blower (8), including a motor, the blower (8) being provided with a blowing port and an air inlet, the air inlet being connected to the smoke exhaust pipeline of the combustion system; A blowing air pipe, connected to the blowing port of the blower (8) and the water inlet or outlet of the heat exchanger (5); Wherein, the combustion system is adapted to heat the heat exchanger (5), and the controller (7) is communicatively connected to the motor.

2. The residual water removal system of the heat exchanger according to claim 1, characterized in that, The blowing system further includes: A check valve (9), provided on the blowing air pipe; Wherein, the blowing port of the blower (8) blows air through the check valve to the water inlet or outlet of the heat exchanger (5).

3. The residual water removal system of the heat exchanger according to claim 1, characterized in that, It further includes: A first temperature sensor (41), adapted to detect the temperature of the water inlet of the heat exchanger (5) and send a first temperature signal; A second temperature sensor (42), adapted to detect the temperature of the water outlet of the heat exchanger (5) and send a second temperature signal; Wherein, the first temperature sensor (41) and the second temperature sensor (42) are respectively communicatively connected to the controller (7), and the controller (7) controls the power of the blower (8) according to the lowest temperature among the first temperature signal and the second temperature signal.

4. The residual water removal system of the heat exchanger according to any one of claims 1 to 3, characterized in that, It further includes: A water flow sensor (6), adapted to detect the water flow rate entering the heat exchanger (5) and send a water flow rate signal; Wherein, the controller (7) is further communicatively connected to the water flow sensor (6), and the controller (7) controls the opening of the drain valve to remove the residual water from the heat exchanger (5) according to the water flow rate signal sent by the water flow sensor (6).

5. The residual water removal system of the heat exchanger according to any one of claims 1 to 3, characterized in that, The drain valve includes: A first drain valve (31), the water inlet of the first drain valve (31) being communicated with the water inlet of the heat exchanger (5); A second drain valve (32), the water inlet of the second drain valve (32) being communicated with the water outlet of the heat exchanger (5).

6. A control device for removing residual water of a heat exchanger, characterized in that, Including: An acquisition module (101), adapted to acquire the opening time of the drain valve; A judgment module (102), communicatively connected to the acquisition module (101), the judgment module (102) being adapted to judge whether the opening time of the drain valve reaches a first period of time; A control module (103), communicatively connected to the judgment module (102), the control module (103) being adapted to start the blowing system to blow air into the inner water pipe of the heat exchanger (5) after the opening time of the drain valve reaches a first period of time; The blowing system includes: A blower (8), including a motor, the blower (8) being provided with a blowing port and an air inlet, the air inlet being connected to the smoke exhaust pipeline of the combustion system; The air blowing pipe is connected to the air outlet of the blower (8) and the water inlet or outlet of the heat exchanger (5); Wherein, the combustion system is adapted to heat the heat exchanger (5), and the controller (7) is communicatively connected to the motor.

7. A gas water heater, characterized in that, Comprising: A heat exchanger (5); The residual water removal system of the heat exchanger according to any one of claims 1 to 4, and the residual water removal system of the heat exchanger is adapted to remove the residual water in the inner water pipe of the heat exchanger (5).

8. The gas water heater according to claim 7, wherein Further comprising: A combustion system provided with a smoke exhaust pipeline, and the combustion system is adapted to heat the heat exchanger (5); Wherein, the smoke exhaust pipeline is connected to the air blowing system of the residual water removal system of the heat exchanger.

9. A method for removing residual water from a heat exchanger, characterized in that, Comprising: Obtain the opening time of the drain valve; When the time for opening the drain valve reaches the first time, start the air blowing system to blow air into the inner water pipe of the heat exchanger (5); The air blowing system includes: A blower (8) including a motor, the blower (8) is provided with an air outlet and an air inlet, and the air inlet is connected to the smoke exhaust pipeline of the combustion system; The air blowing pipe is connected to the air outlet of the blower (8) and the water inlet or outlet of the heat exchanger (5); Wherein, the combustion system is adapted to heat the heat exchanger (5), and the controller (7) is communicatively connected to the motor.

10. The method for removing residual water from the heat exchanger according to claim 9, characterized in that, Further comprising: Close the drain valve after starting the air blowing system to blow air into the inner water pipe of the heat exchanger; When the closing of the drain valve reaches the third time, start the drain valve again.

11. The method for removing residual water from the heat exchanger according to claim 9 or 10, characterized in that, Further comprising: Obtain the first temperature signal at the water inlet of the heat exchanger (5) and the second temperature signal at the water outlet of the heat exchanger; Control the power of the blower of the air blowing system according to the lowest temperature of the first temperature signal and the second temperature signal.

12. The method for removing residual water from the heat exchanger according to claim 9 or 10, characterized in that, Before obtaining the opening time of the drain valve, further comprising: Obtain the water flow signal entering the heat exchanger (5); Control the opening of the drain valve according to the water flow signal to remove the residual water in the heat exchanger (5).

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