Heat Exchange System, Water Heater and Method for Controlling Water Heater

Abstract

The present application provides a heat exchange system, a water heater, and a method for controlling the water heater. The heat exchange system includes a heat exchanger and a flow valve. The heat exchanger includes an inlet tube section and an outlet tube section. The flow valve is provided at a side of the heat exchanger and includes a valve body and a controller provided at the valve body. The valve body includes a first tube connected to the inlet tube section, a second tube connected to the outlet tube section, and a bypass tube connecting the first tube and the second tube. The controller is configured to control the water flow rate of the bypass tube.

What is claimed is: 
     
         1 . A heat exchange system, comprising:
 a heat exchanger provided with a water inlet tube section and a water outlet tube section; and   a flow valve provided at a side of the heat exchanger,   wherein the flow valve comprises a valve body and a controller provided at the valve body, the valve body comprising a first tube communicated with the water inlet tube section, a second tube communicated with the water outlet tube section, and a bypass tube communicating the first tube and the second tube, and wherein the controller is configured to control a water flow rate of the bypass tube.   
     
     
         2 . The heat exchange system according to  claim 1 , wherein a bypass ratio of the flow valve ranges from 40% to 70%, and the bypass ratio being a ratio of a water flow entering the bypass tube through the first tube to a water flow entering the water inlet tube section through the first tube. 
     
     
         3 . The heat exchange system according to  claim 2 , wherein the controller is provided at the bypass tube and configured to control the water flow rate of the bypass tube according to a preset bypass time and the bypass ratio, and the preset bypass time ranging from 2 seconds to 4 seconds. 
     
     
         4 . The heat exchange system according to  claim 1 , wherein the heat exchanger further comprises:
 heat exchange tubes; and   heat exchange plates configured to exchange heat with the heat exchange tubes, the heat exchange plates being sleeved outside the heat exchange tubes,   wherein on an axial projection surface of the heat exchange tubes, a minimum distance between any point on the heat exchange plate and an outer wall of the heat exchange tubes is less than or equal to 3 mm.   
     
     
         5 . The heat exchange system according to  claim 1 , wherein the heat exchanger further comprises two end plates spaced apart and a plurality of heat exchange tubes provided between the two end plates and spaced apart along a first direction,
 wherein each of the end plates is provided with a plurality of communication parts and a plurality of through holes, an outer periphery of each through hole of the end plates provided with an annular protrusion extending toward another one of the end plates, an end part of each heat exchange tube being inserted into one of the annular protrusions and sealedly connected to the annular protrusion, and   wherein the communication parts are provided with communication ports communicating with the through holes, each two of the heat exchange tubes being communicated through the communication port of the communication part, and the plurality of heat exchange tubes being communicated through the plurality of communication parts to form a heat exchange channel.   
     
     
         6 . The heat exchange system according to  claim 5 , wherein the communication part communicating two heat exchange tubes is a first communication part, a maximum opening width of the communication port of the first communication part along the first direction being W1, a maximum width of two annular protrusions on outer sides of the two heat exchange tubes communicated with the first communication part along the first direction being W2, and W1 is less than or equal to W2. 
     
     
         7 . The heat exchange system according to  claim 1 , wherein the water inlet tube section, the water outlet tube section, the first tube, the second tube, and the bypass tube are all provided at a same side of the heat exchanger; and/or,
 wherein a length of the bypass tube is less than or equal to 100 mm; and/or,   wherein the heat exchanger comprises a heat exchanger body provided with a water inlet tube section and a water outlet tube section, the water inlet tube section communicating with a water outlet tube section, and wherein a distance between the flow valve and the heat exchanger body is greater than or equal to 60 mm.   
     
     
         8 . The heat exchange system according to  claim 1 , wherein the heat exchanger further comprises a plurality of heat exchange tubes provided in sequence and spaced apart along a first direction, at least one of the heat exchange tubes provided with a baffle to disturb water flow, the baffle comprising a baffle body and two support parts, top ends of the two support parts connected to the baffle body, and bottom ends of the two support parts spaced apart and respectively supported on an inner wall of the heat exchange tube. 
     
     
         9 . The heat exchange system according to  claim 8 , wherein the baffle body is provided with a plurality of baffle holes spaced apart along a length direction of the heat exchange tube, the baffle provided with a water-facing end, an edge of each baffle hole distant from the water-facing end provided with baffle sheets inclined outward, and two adjacent baffle sheets provided at two sides of the baffle body; and/or
 wherein a hole wall of at least one baffle hole is provided with a baffle spur extending toward the water-facing end.   
     
     
         10 . A water heater, comprising:
 a heat exchange system comprising:   a heat exchanger provided with a water inlet tube section and a water outlet tube section; and   a flow valve provided at a side of the heat exchanger,   wherein the flow valve comprises a valve body and a controller provided at the valve body, the valve body comprising a first tube communicated with the water inlet tube section, a second tube communicated with the water outlet tube section, and a bypass tube communicating with the first tube and the second tube, and wherein the controller is configured to control a water flow rate of the bypass tube.   
     
     
         11 . The water heater according to  claim 10 , wherein a bypass ratio of the flow valve ranges from 40% to 70%, and the bypass ratio being a ratio of a water flow entering the bypass tube through the first tube to a water flow entering the water inlet tube section through the first tube. 
     
     
         12 . The water heater according to  claim 11 , wherein the controller is provided at the bypass tube and configured to control the water flow rate of the bypass tube according to a preset bypass time and the bypass ratio, and the bypass time ranging from 2 seconds to 4 seconds. 
     
     
         13 . The water heater according to  claim 10 , wherein the heat exchanger further comprises:
 heat exchange tubes; and   heat exchange plates configured to exchange heat with the heat exchange tubes, the heat exchange plates being sleeved outside the heat exchange tubes,   wherein on an axial projection surface of the heat exchange tubes, a minimum distance between any point on the heat exchange plate and an outer wall of the heat exchange tubes is less than or equal to 3 mm.   
     
     
         14 . The water heater according to  claim 10 , wherein the heat exchanger further comprises two end plates spaced apart and a plurality of heat exchange tubes provided between the two end plates and spaced apart along a first direction,
 wherein each of the end plates is provided with a plurality of communication parts and a plurality of through holes, an outer periphery of each through hole of the end plates provided with an annular protrusion extending toward another one of the end plates, an end part of each heat exchange tube being inserted into one of the annular protrusions and sealedly connected to the annular protrusion, and   wherein the communication parts are provided with communication ports communicating with the through holes, each two of the heat exchange tubes being communicated through the communication port of the communication part, and the plurality of heat exchange tubes being communicated through the plurality of communication parts to form a heat exchange channel.   
     
     
         15 . The water heater according to  claim 14 , wherein the communication part communicating two heat exchange tubes is a first communication part, a maximum opening width of the communication port of the first communication part along the first direction being W1, a maximum width of two annular protrusions on outer sides of the two heat exchange tubes communicated with the first communication part along the first direction being W2, and W1 is less than or equal to W2. 
     
     
         16 . The water heater according to  claim 10 , wherein the water inlet tube section, the water outlet tube section, the first tube, the second tube, and the bypass tube are all provided at a same side of the heat exchanger; and/or,
 wherein a length of the bypass tube is less than or equal to 100 mm; and/or,   wherein the heat exchanger comprises a heat exchanger body provided with a water inlet tube section and a water outlet tube section, the water inlet tube section communicating with a water outlet tube section, and wherein a distance between the flow valve and the heat exchanger body is greater than or equal to 60 mm.   
     
     
         17 . The water heater according to  claim 10 , wherein the heat exchanger further comprises a plurality of heat exchange tubes provided in sequence and spaced apart along a first direction, at least one of the heat exchange tubes provided with a baffle to disturb water flow, the baffle comprising a baffle body and two support parts, top ends of the two support parts connected to the baffle body, and bottom ends of the two support parts spaced apart and respectively supported on an inner wall of the heat exchange tube. 
     
     
         18 . The water heater according to  claim 17 , wherein the baffle body is provided with a plurality of baffle holes spaced apart along a length direction of the heat exchange tube, the baffle provided with a water-facing end, an edge of each baffle hole distant from the water-facing end provided with baffle sheets inclined outward, and two adjacent baffle sheets provided at two sides of the baffle body; and/or
 wherein a hole wall of at least one baffle hole is provided with a baffle spur extending toward the water-facing end.   
     
     
         19 . A method for controlling a water heater, applied to the water heater according to  claim 10 , comprising:
 obtaining a water usage state of the water heater; and   in response to determining that the water heater is in a subsequent water usage state within a first preset time, controlling a bypass tube to open according to a preset bypass ratio and close after a preset bypass time, wherein the preset bypass time ranges from 2 seconds to 4 seconds, the preset bypass ratio ranging from 40% to 70%, and the bypass ratio being a ratio of a water flow entering the bypass tube through a first tube to a water flow entering the water inlet tube section through the first tube.   
     
     
         20 . The method according to  claim 19 , further comprising:
 obtaining a water inlet flow of the water heater;   in response to determining that the water heater is in a water-off state where the water inlet flow is less than or equal to a first preset flow, controlling the bypass tube to open; and   in response to determining that the water heater is in the water-off state and a water-off time exceeds a second preset time, controlling the bypass tube to close, wherein the second preset time ranges from 5 minutes to 10 minutes.