Gas water heater
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG VANWARD NEW ELECTRIC CO LTD
- Filing Date
- 2025-06-23
- Publication Date
- 2026-06-23
Smart Images
Figure CN224398007U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas water heater technology, and in particular to a gas water heater. Background Technology
[0002] When a gas water heater is working, the burner burns gas in the combustion chamber to heat the water flowing through the heat exchanger, thus providing hot water to the user.
[0003] When the water supply to a gas water heater is interrupted, the gas in the combustion chamber stops burning, but the hot water in the heat exchanger continues to absorb residual heat, causing the hot water temperature to rise sharply and increasing the temperature rise after the water supply is interrupted. When the water supply is restarted, the gas water heater needs to reignite. Since combustion and heating take time, some cold water will flow out first, causing the water temperature to fluctuate and affecting the user experience. Current technology connects a storage tank in parallel to the outlet pipe of the gas water heater to neutralize the hot water after the temperature rise due to the water supply interruption and the cold water after restarting. However, the neutralized water temperature cannot achieve the desired effect and still cannot maintain a constant temperature. Utility Model Content
[0004] The technical problem solved by this utility model is to provide a gas water heater that can effectively solve the problem of inconsistent hot water temperature provided to users by existing gas water heaters; and achieve the goal of providing stable, constant-temperature hot water.
[0005] The above-mentioned technical problems are solved by the following technical solutions:
[0006] A gas water heater includes a self-mixing valve, which includes an inlet, an outlet, and a first flow channel and a second flow channel connected in parallel between the inlet and the outlet. The time difference t between the water flowing from the inlet into the first flow channel and the second flow channel and reaching the outlet satisfies the following relationship: t = V2 / Q2 - V1 / Q1 = t1, where the volume of the first flow channel is V1, the volume of the second flow channel is V2, the water flow rate of the first flow channel is Q1, the water flow rate of the second flow channel is Q2, and t1 is the interval between the highest temperature rise during water outage and the lowest temperature drop during secondary start-up of the gas water heater.
[0007] The gas water heater described in this utility model has the following advantages compared with the prior art:
[0008] The gas water heater provided by this utility model features a self-mixing valve with a first flow channel and a second flow channel connected in parallel between the inlet and outlet. By designing the volumes of the first and second flow channels and controlling the water flow rates entering them, the time difference between the water flowing from the inlet to the outlet is precisely equal to the time interval t1 between the highest temperature rise during water outage and the lowest temperature drop during restart. This allows for more precise control of the mixing of the higher-temperature water generated during water outage and the lower-temperature water generated during restart, ensuring that the hot water provided to the user by the gas water heater remains at a constant temperature.
[0009] In one embodiment, the water flow rate Q1 of the first flow channel and the water flow rate Q2 of the second flow channel are the same, and the volume V1 of the first flow channel is smaller than the volume V2 of the second flow channel.
[0010] In one embodiment, the cross-sectional area of the first flow channel is the same as that of the second flow channel, and the length of the first flow channel is less than the length of the second flow channel.
[0011] In one embodiment, the first flow channel includes a first inlet communicating with the inlet and a first outlet communicating with the outlet, and the second flow channel includes a second inlet communicating with the inlet and a second outlet communicating with the outlet;
[0012] The flow area of the first inlet is smaller than that of the second inlet, and the flow area of the first outlet is smaller than that of the second outlet.
[0013] In one embodiment, the first inlet is directly opposite the water inlet, and the first outlet is directly opposite the water outlet.
[0014] In one embodiment, the cross-sections of both the first flow channel and the second flow channel are set to be circular or square.
[0015] In one embodiment, the first flow channel is configured as a straight flow channel, and the second flow channel is configured as a curved flow channel or a bent flow channel.
[0016] In one embodiment, the self-mixing valve has a plastic valve body.
[0017] In one embodiment, the gas water heater further includes a heat exchanger, the hot water outlet of which is connected to a water outlet pipe, and the self-mixing valve is disposed on the water outlet pipe.
[0018] In one embodiment, the outlet pipe is further provided with an outlet temperature sensor for detecting the outlet water temperature, and the self-mixing valve is located before the outlet temperature sensor. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the working principle of a gas water heater provided in a specific embodiment of this utility model;
[0021] Figure 2 This is a schematic diagram of the structure of the self-mixing valve provided in a specific embodiment of this utility model;
[0022] Figure 3 This is a schematic diagram of the flow path of water inside the self-mixing valve provided in a specific embodiment of this utility model;
[0023] Figure 4 This is a schematic diagram of the inlet temperature fluctuation curve of the self-mixing valve of the gas water heater provided in a specific embodiment of the present invention.
[0024] Figure 5 This is a schematic diagram comparing the temperature fluctuation curves of the first and second outlets of the self-mixing valve provided in a specific embodiment of this utility model.
[0025] Figure 6 This is a schematic diagram comparing the temperature fluctuation curves of the first outlet, the second outlet, and the outlet of the self-mixing valve provided in a specific embodiment of this utility model.
[0026] In the picture:
[0027] 100. Water supply unit; 200. Gas water heater;
[0028] 1. Self-mixing valve; 11. Inlet; 12. Outlet; 13. First flow channel; 131. First inlet; 132. First outlet; 14. Second flow channel; 141. Second inlet; 142. Second outlet;
[0029] 2. Heat exchanger; 21. Inlet pipe; 22. Outlet pipe;
[0030] 3. Main controller;
[0031] 4. Water flow sensor;
[0032] 5. Inlet water temperature sensor;
[0033] 6. Outlet water temperature sensor. Detailed Implementation
[0034] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0036] like Figures 1-3 The present embodiment provides a gas water heater 200, including a burner and a heat exchanger 2. The burner produces high-temperature flue gas through fuel combustion. The cold water inlet of the heat exchanger 2 is connected to the inlet pipe 21, and the hot water outlet is connected to the outlet pipe 22. Cold water enters the heat exchanger 2 through the inlet pipe 21. The high-temperature flue gas exchanges heat with the cold water in the heat exchanger 2, and the generated hot water is supplied to the water user 100 (shower head, etc.) through the outlet pipe 22.
[0037] The gas water heater 200 also includes a main controller 3, a water flow sensor 4, an inlet water temperature sensor 5, and an outlet water temperature sensor 6. All three sensors are communicatively connected to the main controller 3. The water flow sensor 4 and inlet water temperature sensor 5 are both located on the inlet pipe 21. The water flow sensor 4 detects the flow rate of cold water entering the heat exchanger 2 and sends the detected flow rate value to the main controller 3 in real time. The inlet water temperature sensor 5 detects the temperature of the cold water entering the heat exchanger 2 and sends the detected temperature value to the main controller 3 in real time. The outlet water temperature sensor 6 is located on the outlet pipe 22 and detects the temperature of the hot water flowing out of the heat exchanger 2, sending the detected temperature value to the main controller 3 in real time. The main controller 3 calculates and judges based on the received cold water flow rate, cold water temperature, and hot water temperature to perform further control based on the judgment results. The specific control principle of the main controller 3 of the gas water heater 200 is existing technology and will not be elaborated here.
[0038] When the water supply to the gas water heater 200 is interrupted, the residual heat in the heat exchanger 2 causes a temperature rise. During restart, the heating process after secondary ignition takes time, resulting in a temperature drop and uneven water temperature at the user end 100. To address the technical problem of uneven hot water temperature supplied to the user by the outlet pipe 22 due to the temperature rise during water outages and the temperature drop during restart, which affects the user experience, the gas water heater 200 provided in this embodiment also includes a self-mixing valve 1. The self-mixing valve 1 is installed on the outlet pipe 22 to mix the higher-temperature water flow from the hot water outlet of the heat exchanger 2 during the temperature rise during water outages and the lower-temperature water flow during the temperature drop during restart, thereby ensuring a constant hot water temperature at the user end 100 and improving the user experience.
[0039] Specifically, the self-mixing valve 1 includes an inlet 11, an outlet 12, and a first flow channel 13 and a second flow channel 14 connected in parallel between the inlet 11 and the outlet 12. The time difference t between the water flowing from the inlet 11 into the first flow channel 13 and the second flow channel 14 and reaching the outlet 12 satisfies the following relationship: t = V2 / Q2 - V1 / Q1 = t1, where the volume of the first flow channel 13 is V1, the volume of the second flow channel 14 is V2, the water flow rate of the first flow channel 13 is Q1, the water flow rate of the second flow channel 14 is Q2, and t1 is the interval between the highest temperature rise during water outage and the lowest temperature drop during secondary start-up of the gas water heater 200. By designing the volume of the first flow channel 13 and the volume of the second flow channel 14, and controlling the water flow rate into the first flow channel 13 and the second flow channel 14, the time difference between the water flowing from the inlet 11 into the first flow channel 13 and the second flow channel 14 and reaching the outlet 12 is exactly equal to the time interval t1 between the highest temperature of the gas water heater 200 during water outage and the lowest temperature of the temperature drop during secondary startup. This allows for more precise control of the mixing of the higher temperature water generated during water outage and the lower temperature water generated during secondary startup, ensuring that the hot water provided by the gas water heater 200 to the user remains at a constant temperature.
[0040] like Figures 3-6 As shown, through experimental testing, the total water flow rate in the gas water heater 200 is Q, the temperature rise during water outage is T1, the temperature drop during secondary start-up is T2, and the time interval t1 between the highest temperature during water outage and the lowest temperature during secondary start-up is determined by the characteristics of the gas water heater 200. For gas water heaters 200 with the same parameters, T1, T2, and t1 are generally fixed. The specific values of T1, T2, and t1 can be obtained through testing.
[0041] After the water supply is interrupted, the higher-temperature water flowing from the hot water outlet of heat exchanger 2 enters the outlet pipe 22 and then enters the inlet 11 of the self-mixing valve 1, where it is split into the first flow channel 13 and the second flow channel 14. The water entering the first flow channel 13 reaches the outlet 12 first, while the water in the second flow channel 14 reaches the outlet 12 after a time t. In order to utilize the temperature rise during the water outage to neutralize the temperature drop during the second start-up, and to make t as close as possible to t1, i.e., t = V2 / Q2 - V1 / Q1 = t1, where t1 is a fixed value obtained after testing, the volume of the first flow channel 13 and the volume of the second flow channel 14 are designed using the above relationship, and / or the water flow rates entering the first flow channel 13 and the second flow channel 14 through the inlet 11 are adjusted. This allows the lower-temperature water in the first flow channel 13 after the second start-up temperature drop and the higher-temperature water in the second flow channel 14 after the water outage temperature rise to mix at the outlet 12, resulting in constant-temperature hot water for use.
[0042] In one embodiment, the water flow rate Q1 of the first flow channel 13 and the water flow rate Q2 of the second flow channel 14 are the same, and the volume V1 of the first flow channel 13 is smaller than the volume V2 of the second flow channel 14. When Q1 = Q2, the ratio of V2 to V1 is adjusted to satisfy the following relationship: V2 - V1 = t1Q1 = t1Q2. By increasing the water capacity in the second flow channel 14, the residence time of the higher-temperature water after the water supply interruption and temperature rise in the second flow channel 14 is extended, thereby enabling the higher-temperature water generated by the water supply interruption and temperature rise entering the second flow channel 14 to mix with the lower-temperature water generated by the secondary start-up temperature drop in the first flow channel 13 at the outlet 12 of the self-mixing valve 1. After the two are neutralized, the water flowing to the water-using end 100 has a suitable temperature.
[0043] In one embodiment, the cross-sectional area of the first flow channel 13 is the same as that of the second flow channel 14, and the length of the first flow channel 13 is less than the length of the second flow channel 14. Since the volume of the flow channel is equal to the product of the cross-sectional area and the length of the flow channel, the cross-sectional area is designed to be the same, and the length of the first flow channel 13 is designed to be less than the length of the second flow channel 14, thereby increasing the volume of the second flow channel 14.
[0044] Of course, in other embodiments, the length of the first flow channel 13 and the length of the second flow channel 14 can be designed to be the same, and the cross-sectional area of the first flow channel 13 can be designed to be smaller than the cross-sectional area of the second flow channel 14, so as to increase the volume of the second flow channel 14, increase the water capacity in the second flow channel 14, and thus prolong the residence time of the higher temperature water in the second flow channel 14 after the water is stopped and the temperature rises.
[0045] In one embodiment, the first flow channel 13 includes a first inlet 131 communicating with the inlet 11 and a first outlet 132 communicating with the outlet 12, and the second flow channel 14 includes a second inlet 141 communicating with the inlet 11 and a second outlet 142 communicating with the outlet 12. The flow area of the first inlet 131 is smaller than the flow area of the second inlet 141, and the flow area of the first outlet 132 is smaller than the flow area of the second outlet 142.
[0046] When the total flow rate of the gas water heater 200 is Q, the flow rates entering the first flow channel 13 and the second flow channel 14 are both Q / 2, i.e., Q1 = Q2 = Q / 2. Then, substituting into the formula V2 - V1 = t1Q1 = t1Q2 = t1Q / 2, we obtain the relationship between V2 and V1. The flow rate is related to the flow area of the inlet and outlet of the flow channel and the length of the flow channel. The longer the flow channel, the greater the flow resistance and the smaller the flow rate. To ensure that the flow rates of the first flow channel 13 and the second flow channel 14 are consistent, the flow area of the first inlet 131 of the first flow channel 13 is designed to be smaller than the flow area of the second inlet 141, and the flow area of the first outlet 132 is designed to be smaller than the flow area of the second outlet 142.
[0047] In one embodiment, the cross-sections of the first flow channel 13 and the second flow channel 14 are both circular or square. For ease of processing, the cross-sections of the first flow channel 13 and the second flow channel 14 are set to the same shape. Flow channels with circular cross-sections have less resistance than flow channels with square cross-sections. Alternatively, the cross-section of the first flow channel 13 can be designed to be square, and the cross-section of the second flow channel 14 can be designed to be circular.
[0048] In one embodiment, the first flow channel 13 is configured as a straight flow channel, and the second flow channel 14 is configured as a curved or bendable flow channel. The length of the straight flow channel is shorter than that of the curved or bendable flow channel, and the resistance is lower. When the water flow rate of the first flow channel 13 and the water flow rate of the second flow channel 14 are the same, the volume of the second flow channel 14 is designed to be larger to prolong the residence time of the higher-temperature water generated by the water temperature rise during water outage in the self-mixing valve 1, so as to mix with the lower-temperature water generated by the secondary start-up temperature drop in the first flow channel 13 at the outlet 12 of the self-mixing valve 1, so as to keep the water temperature constant at the user end. Specifically, a curved flow channel refers to a flow channel with an arc-shaped bend, which can be further configured as an "S"-shaped or three-dimensional spiral channel. In order to make the structure of the self-mixing valve 1 more compact, the spiral channel can also be configured as a spiral flow channel that coils around the first flow channel 13; a bendable flow channel refers to a flow channel with a certain bend angle, such as Figure 2 In the middle section, the flow channel is a right-angle bend with a 90° bend, which is easier to process and helps reduce the production cost of the self-mixing valve 1. Of course, the bend in the flow channel is not limited to a right-angle bend; it may also be an acute angle, an obtuse angle, or a combination of various angles, which will not be elaborated here.
[0049] In one embodiment, the first inlet 131 is directly opposite to the inlet 11, and the first outlet 132 is directly opposite to the outlet 12. This arrangement avoids the simultaneous increase in the length of the first flow channel 13 and the volume of the self-mixing valve 1 due to the first flow channel 13 extending in a direction perpendicular to the line connecting the inlet 11 and the outlet 12. This arrangement can reduce the volume of the self-mixing valve 1.
[0050] In one embodiment, the self-mixing valve 1 has a plastic valve body. By designing the self-mixing valve 1 as a plastic component, its internal structure neutralizes the temperature rise during water outages and the temperature drop during secondary startup of the gas water heater 200, achieving better constant temperature performance. The structure is simple, easy to process, requires no other parts, and reduces costs.
[0051] In one embodiment, the self-mixing valve 1 is located before the outlet water temperature sensor 6. The outlet water temperature sensor 6 detects the water temperature flowing out of the outlet 12 of the self-mixing valve 1 to ensure that the temperature rise during water interruption in the second flow channel 14 is neutralized by the temperature drop during secondary startup, thus ensuring a constant water temperature at the water consumption end 100 and improving the user experience.
[0052] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of this utility model. The content of this specification should not be construed as a limitation of this utility model.
Claims
1. A gas water heater, characterized in that, The system includes a self-mixing valve (1), which includes an inlet (11), an outlet (12), and a first flow channel (13) and a second flow channel (14) connected in parallel between the inlet (11) and the outlet (12). The time difference t between the water flow entering the first flow channel (13) and the second flow channel (14) from the inlet (11) and reaching the outlet (12) satisfies the following relationship: t = V2 / Q2 - V1 / Q1 = t1, where the volume of the first flow channel (13) is V1, the volume of the second flow channel (14) is V2, the water flow rate of the first flow channel (13) is Q1, the water flow rate of the second flow channel (14) is Q2, and t1 is the interval between the highest temperature rise during water outage and the lowest temperature drop during secondary start-up of the gas water heater.
2. The gas water heater according to claim 1, characterized in that, The water flow rate Q1 of the first flow channel (13) and the water flow rate Q2 of the second flow channel (14) are the same, and the volume V1 of the first flow channel (13) is smaller than the volume V2 of the second flow channel (14).
3. The gas water heater according to claim 2, characterized in that, The cross-sectional area of the first flow channel (13) is the same as that of the second flow channel (14), and the length of the first flow channel (13) is less than the length of the second flow channel (14).
4. The gas water heater according to claim 3, characterized in that, The first flow channel (13) includes a first inlet (131) connected to the inlet (11) and a first outlet (132) connected to the outlet (12), and the second flow channel (14) includes a second inlet (141) connected to the inlet (11) and a second outlet (142) connected to the outlet (12); The flow area of the first inlet (131) is smaller than that of the second inlet (141), and the flow area of the first outlet (132) is smaller than that of the second outlet (142).
5. The gas water heater according to claim 4, characterized in that, The first inlet (131) is directly opposite the inlet (11), and the first outlet (132) is directly opposite the outlet (12).
6. The gas water heater according to claim 3, characterized in that, The cross-sections of the first flow channel (13) and the second flow channel (14) are both set to be circular or square.
7. The gas water heater according to claim 3, characterized in that, The first flow channel (13) is configured as a straight flow channel, and the second flow channel (14) is configured as a curved flow channel or a bent flow channel.
8. The gas water heater according to any one of claims 1-7, characterized in that, The self-mixing valve (1) has a plastic valve body.
9. The gas water heater according to any one of claims 1-7, characterized in that, The gas water heater also includes a heat exchanger (2), the hot water outlet of the heat exchanger (2) is connected to a water outlet pipe (22), and the self-mixing valve (1) is located on the water outlet pipe (22).
10. The gas water heater according to claim 9, characterized in that, The outlet pipe (22) is also equipped with an outlet temperature sensor (6) for detecting the outlet water temperature, and the self-mixing valve (1) is located before the outlet temperature sensor (6).