Heat exchanger, water heater and gas heating water heater
By setting up a venturi pipe and a return pipe in the heat exchanger, the liquid is returned to the water inlet pipe, the problem of insufficient smoke exhaust temperature under low load is solved, the smoke exhaust temperature of the heat exchanger is increased, the generation of condensate is avoided, and the generation of condensate is extended. The service life of the equipment.
Patent Information
- Application Number
- CN202420103864.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-16
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-01-16
AI Technical Summary
The smoke exhaust temperature of existing water heaters and gas heating hot water furnaces is difficult to reach 110℃ under low load conditions, resulting in the production of condensation water, which may cause metal corrosion and safety hazards, especially in winter.
Set a venturi pipe on the water inlet pipe of the heat exchanger and connect its negative pressure port to the return pipe to make the heated liquid return to the water inlet pipe, increase the water inlet temperature, reduce the heat exchange of smoke, thereby improving smoke exhaust Temperature to avoid or reduce the production of condensate.
By increasing the inlet temperature of the heat exchanger and increasing the smoke exhaust temperature, the generation of condensate is avoided, the service life of the equipment is extended and the risk of corrosion is reduced.
Smart Images
Figure CN222143345U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a heat exchanger, a water heater and a gas heating water heater. Background Art
[0002] The national standard stipulates that the exhaust temperature of water heaters and gas-fired hot water boilers under rated load shall not be lower than 110°C. If the exhaust temperature is too low, water vapor will liquefy inside the machine to produce condensed water. Condensed water is weakly acidic water, and contact with the gas hood, heat exchanger and combustion chamber box may cause metal corrosion, shorten the life of the machine, and seriously cause safety hazards. When the machine is working at small and medium loads, the smoke temperature is difficult to reach above 110°C, especially in the cold winter season, which is very unfavorable for the operation of the machine.
[0003] In addition, for non-condensing models, even if the smoke duct is installed in accordance with the downward tilt specification, it is impossible to ensure that the condensed water generated before the smoke duct is discharged normally. Utility Model Content
[0004] The technical problem to be solved by the utility model is to overcome the defect in the prior art that condensed water is easily generated due to the low smoke temperature, and to provide a heat exchanger, a water heater and a gas heating water heater.
[0005] The utility model solves the above technical problems through the following technical solutions:
[0006] A heat exchanger, comprising a water inlet pipe, a water outlet pipe and a return pipe, wherein both ends of the return pipe are respectively connected to the water inlet pipe and the water outlet pipe;
[0007] The heat exchanger also includes a venturi tube, which is arranged on the water inlet pipe, and the negative pressure port of the venturi tube is connected to the return pipe, so that part of the liquid at the water outlet pipe flows to the return pipe and enters the water inlet pipe from the negative pressure port.
[0008] In this solution, a venturi tube is provided on the water inlet pipe, and the negative pressure port of the venturi tube is connected to the return pipe. When liquid flows in the heat exchanger, part of the liquid in the outlet pipe that has been heated can enter the water inlet pipe through the negative pressure port, thereby increasing the water inlet temperature of the heat exchanger. Compared with low-temperature water, when the water inlet temperature increases, less heat is exchanged by the flue gas through the heat exchanger, so the exhaust temperature of the heat exchanger is higher, thereby avoiding or reducing the generation of condensed water.
[0009] Preferably, the venturi tube comprises an inlet, an outlet and a throat, wherein the inlet, the throat and the outlet are connected in sequence; the negative pressure port is connected to the throat, and the inlet and the outlet are both connected to the water inlet pipe;
[0010] The liquid enters from the water inlet pipe, enters the Venturi tube from the inlet, and flows to the water outlet pipe through the outlet; part of the liquid at the water outlet pipe flows to the negative pressure port through the return pipe, and flows to the outlet.
[0011] In this solution, by adopting the above structural form, it is beneficial to improve the reflux effect of the Venturi tube, so that the liquid can smoothly flow back into the water inlet pipe through the Venturi tube.
[0012] Preferably, the inlet portion includes an inlet cylindrical section and a contraction section, and the outlet portion includes a diffusion section; the inlet cylindrical section, the contraction section, the throat and the diffusion section are connected in sequence along the axial direction of the Venturi tube; and the negative pressure port is connected to the throat along a direction perpendicular to the axial direction of the Venturi tube.
[0013] In this solution, by adopting the above structural form, the reflux effect of the Venturi tube can be further improved.
[0014] Preferably, the heat exchanger further comprises a temperature control valve, which is arranged at the connection between the return pipe and the outlet pipe, and is used to reduce or close the circulation of the return pipe when the inlet water temperature is higher than a preset value.
[0015] In this solution, when the inlet water temperature continues to rise, causing the outlet water temperature to be too high, the temperature control valve can reduce or close the passage at the return pipe according to the set temperature, so that the inlet water temperature is reduced and the outlet water temperature remains stable.
[0016] Preferably, the temperature control valve is a water solenoid valve or a memory alloy valve.
[0017] Preferably, the length of the return pipe is shorter than the length from the water outlet pipe to the water use end.
[0018] In this solution, the backflow effect at the negative pressure port can be improved.
[0019] A water heater comprises the heat exchanger as described above.
[0020] In this solution, by adopting the above-mentioned heat exchanger, the generation of condensed water can be avoided or reduced, thereby increasing the service life of the machine.
[0021] Preferably, the water heater further comprises a burner and a smoke collecting hood, wherein the smoke collecting hood is arranged above the heat exchanger, and the burner is arranged below the heat exchanger; and the return pipe is located at the position where the burner is located.
[0022] A gas heating water heater comprises the heat exchanger as described above.
[0023] In this solution, by adopting the above-mentioned heat exchanger, the generation of condensed water can be avoided or reduced, thereby increasing the service life of the machine.
[0024] Preferably, the heat exchanger is the combustion heat exchange system of the gas heating water heater, and an exhaust passage is provided on the top of the combustion heat exchange system; the water inlet pipe is the heating water inlet pipe of the gas heating water heater, and the water outlet pipe is the heating return pipe of the gas heating water heater.
[0025] The positive and progressive effect of the utility model is that a venturi tube is arranged on the water inlet pipe, and the negative pressure port of the venturi tube is connected to the return pipe. When liquid flows in the heat exchanger, part of the liquid in the outlet pipe that has been heated can enter the water inlet pipe through the negative pressure port, so that the water inlet temperature of the heat exchanger is increased. Compared with low-temperature water, when the water inlet temperature is increased, the heat exchanged by the flue gas through the heat exchanger is less, so the exhaust temperature of the heat exchanger is higher, thereby avoiding or reducing the generation of condensed water. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 A schematic diagram of the structure of a heat exchanger provided in an embodiment of the utility model applied to a water heater;
[0027] Figure 2 A schematic diagram of the structure of a heat exchanger provided in an embodiment of the utility model applied to a gas-fired heating water heater;
[0028] Figure 3 A schematic structural diagram of a venturi tube provided in an embodiment of the utility model.
[0029] Description of reference numerals:
[0030] Water heater 1, gas heating water heater 2, heat exchanger 10, burner 20, smoke hood 30, exhaust channel 40, combustion heat exchange system 50, plate heat exchanger 60, water inlet pipe 100, water outlet pipe 200, return pipe 300, venturi tube 400, inlet 410, cylindrical section 411, contraction section 412, outlet 420, diffusion section 421, throat 430, negative pressure port 440, temperature control valve 500. DETAILED DESCRIPTION
[0031] The present invention is further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.
[0032] The present utility model embodiment provides a heat exchanger 10, such as Figure 1 and Figure 2As shown, the heat exchanger 10 includes an inlet pipe 100, an outlet pipe 200 and a return pipe 300, and both ends of the return pipe 300 are connected to the inlet pipe 100 and the outlet pipe 200 respectively. Figure 1 and Figure 2 As shown, the liquid enters from the water inlet pipe 100, flows through the heat exchange area of the heat exchanger 10, and then flows out from the water outlet pipe 200; when the liquid flows through the heat exchange area, it will be heated and the outlet water temperature at the water outlet pipe 200 is higher than the inlet water temperature of the water inlet pipe 100.
[0033] like Figure 1 and Figure 2 As shown, the heat exchanger 10 also includes a venturi tube 400, which is arranged on the water inlet pipe 100, and the negative pressure port 440 of the venturi tube 400 is connected to the return pipe 300, so that part of the liquid at the outlet pipe 200 flows to the return pipe 300 and enters the water inlet pipe 100 from the negative pressure port 440.
[0034] A venturi tube 400 is provided on the water inlet pipe 100, and a negative pressure port 440 of the venturi tube 400 is connected to the return pipe 300. When liquid flows in the heat exchanger 10, part of the liquid heated in the water outlet pipe 200 can enter the water inlet pipe 100 through the negative pressure port 440, thereby increasing the water inlet temperature of the heat exchanger 10. Compared with low-temperature water, when the water inlet temperature increases, less heat is exchanged by the flue gas through the heat exchanger 10, so the exhaust temperature of the heat exchanger 10 is higher, thereby avoiding or reducing the generation of condensed water.
[0035] In specific implementation, when there is a demand for domestic water, the water flows through the venturi tube 400. Due to the structural characteristics of the venturi tube 400, a negative pressure state appears at the throat 430. Since the length of the return pipe 300 is much shorter than the length from the equipment to the water point, part of the water on the outlet side will be sucked back to the water inlet side by the negative pressure, and then the inlet water temperature will slowly increase. When the inlet water temperature increases, the heat exchanged by the flue gas through the heat exchanger 10 is less than that of low-temperature water, so the exhaust temperature will be higher, thereby avoiding or reducing the generation of condensed water.
[0036] like Figure 3 As shown, the venturi tube 400 includes an inlet 410, an outlet 420 and a throat 430, and the inlet 410, the throat 430 and the outlet 420 are connected in sequence; the negative pressure port 440 is connected to the throat 430, and the inlet 410 and the outlet 420 are both connected to the water inlet pipe 100; the liquid enters from the water inlet pipe 100, and enters the venturi tube 400 from the inlet 410, and flows to the outlet pipe 200 through the outlet 420; part of the liquid at the outlet pipe 200 flows to the negative pressure port 440 through the reflux pipe 300, and flows to the outlet 420. It is beneficial to improve the reflux effect of the venturi tube 400, so that the liquid can smoothly flow back to the water inlet pipe 100 through the venturi tube 400.
[0037] like Figure 3 As shown, the inlet portion 410 includes an inlet cylindrical section 411 and a contraction section 412, and the outlet portion 420 includes a diffusion section 421; the inlet cylindrical section 411, the contraction section 412, the throat 430 and the diffusion section 421 are sequentially connected along the axis direction of the venturi tube 400; the negative pressure port 440 is connected to the throat 430 along a direction perpendicular to the axis direction of the venturi tube 400. Thus, the reflux effect of the venturi tube 400 can be further improved.
[0038] like Figure 1 and Figure 2 As shown, the heat exchanger 10 further includes a temperature control valve 500, which is disposed at the connection between the return pipe 300 and the outlet pipe 200. The temperature control valve 500 is used to reduce or close the circulation of the return pipe 300 when the inlet water temperature is higher than a preset value. When the inlet water temperature continues to rise, resulting in an excessively high outlet water temperature, the temperature control valve 500 can reduce or close the passage at the return pipe 300 according to the set temperature, so that the inlet water temperature is reduced and the outlet water temperature remains stable. Specifically, the temperature control valve 500 is a water solenoid valve or a memory alloy valve.
[0039] In a specific implementation, the length of the return pipe 300 is shorter than the length from the water outlet pipe 200 to the water use end, so as to improve the return effect at the negative pressure port 440 .
[0040] The utility model embodiment provides a water heater 1, such as Figure 1 As shown, the water heater 1 includes the above-mentioned heat exchanger 10. By adopting the above-mentioned heat exchanger 10, the generation of condensed water can be avoided or reduced, thereby increasing the service life of the machine.
[0041] like Figure 1 As shown, the water heater 1 further includes a burner 20 and a smoke hood 30. The smoke hood 30 is arranged above the heat exchanger 10, and the burner 20 is arranged below the heat exchanger 10. When the water heater 1 is in use, smoke burns in the combustion chamber, enters the heat exchanger 10 to exchange heat with the water flow, and is then discharged through the smoke hood 30 above. In addition, the return pipe 300 is located at the position where the burner 20 is located. When the liquid in the water outlet pipe 200 flows through the burner 20, the liquid temperature can be maintained or increased at a higher temperature of the burner 20, so that the temperature of the liquid flowing back to the water inlet pipe 100 is higher.
[0042] The utility model embodiment also provides a gas heating water heater 12, such as Figure 2As shown, the gas heating water heater 12 includes the above-mentioned heat exchanger 10. Therefore, in actual use, the gas heating water heater 12 is in a long-term small and medium load combustion during the heating season, and condensed water is very likely to be generated. By adopting the above heat exchanger 10, the generation of condensed water can be avoided or reduced, thereby avoiding the risk of water leakage caused by the corrosion of the heat exchanger 10 by the condensed water, and improving the service life of the machine.
[0043] like Figure 2 As shown, the heat exchanger 10 is a combustion heat exchange system 50 of a gas-fired heating water heater 12 , and an exhaust passage 40 is provided on the top of the combustion heat exchange system 50 ; the water inlet pipe 100 is a heating water inlet pipe 100 of the gas-fired heating water heater 12 , and the water outlet pipe 200 is a heating return water pipe of the gas-fired heating water heater 12 .
[0044] In other embodiments, a return pipe 300 , a venturi tube 400 and a temperature control valve 500 may also be provided on the plate heat exchanger 60 of the gas-fired heating water boiler 12 to increase the water inlet temperature of the plate heat exchanger 60 .
[0045] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.
Claims
1. A heat exchanger, comprising a water inlet pipe, a water outlet pipe and a return pipe, wherein both ends of the return pipe are connected to the water inlet pipe and the water outlet pipe respectively; characterized in that: The heat exchanger also includes a venturi tube, which is arranged on the water inlet pipe, and the negative pressure port of the venturi tube is connected to the return pipe, so that part of the liquid at the water outlet pipe flows to the return pipe and enters the water inlet pipe from the negative pressure port.
2. The heat exchanger according to claim 1, characterized in that The venturi tube comprises an inlet, an outlet and a throat, wherein the inlet, the throat and the outlet are connected in sequence; the negative pressure port is connected to the throat, and the inlet and the outlet are both connected to the water inlet pipe; The liquid enters from the water inlet pipe, enters the Venturi tube from the inlet, and flows to the water outlet pipe through the outlet; part of the liquid at the water outlet pipe flows to the negative pressure port through the return pipe, and flows to the outlet.
3. The heat exchanger according to claim 2, characterized in that The inlet portion includes an inlet cylindrical section and a contraction section, and the outlet portion includes a diffusion section; the inlet cylindrical section, the contraction section, the throat and the diffusion section are connected in sequence along the axial direction of the Venturi tube; the negative pressure port is connected to the throat along a direction perpendicular to the axial direction of the Venturi tube.
4. The heat exchanger according to claim 1, characterized in that The heat exchanger further comprises a temperature control valve, which is arranged at the connection between the return pipe and the water outlet pipe, and is used to reduce or close the circulation of the return pipe when the inlet water temperature is higher than a preset value.
5. The heat exchanger according to claim 4, characterized in that The temperature control valve is a water solenoid valve or a memory alloy valve.
6. The heat exchanger according to claim 1, characterized in that The length of the return pipe is shorter than the length from the water outlet pipe to the water use end.
7. A water heater, characterized in that: The water heater comprises a heat exchanger as claimed in any one of claims 1 to 6.
8. The water heater according to claim 7, characterized in that The water heater further comprises a burner and a smoke collecting hood, wherein the smoke collecting hood is arranged above the heat exchanger, and the burner is arranged below the heat exchanger; the return pipe is located at the position where the burner is located.
9. A gas-fired hot water boiler, characterized in that: The gas heating water heater comprises a heat exchanger as claimed in any one of claims 1 to 6.
10. The gas heating water heater according to claim 9, characterized in that: The heat exchanger is the combustion heat exchange system of the gas heating water heater, and an exhaust channel is provided on the top of the combustion heat exchange system; the water inlet pipe is the heating water inlet pipe of the gas heating water heater, and the water outlet pipe is the heating return pipe of the gas heating water heater.