Three-way valve and gas water heater

Abstract

The utility model belongs to the technical field of heat supply, and particularly discloses a three-way valve and a gas water heater, the three-way valve comprises a main valve body, a bypass valve and a one-way valve, the main valve body is provided with a main valve cavity, a first port, a second port and a third port, and the first port and the second port are communicated through the main valve cavity; the bypass valve comprises a bypass valve element and a driving part, the bypass valve element is located in the main valve body and provided with a first station and a second station, the driving part is configured to drive the bypass valve element to be switched between the first station and the second station, when the bypass valve element is located at the first station, the third port communicates with the main valve cavity, and when the bypass valve element is located at the second station, the second port communicates with the main valve cavity. The third port is disconnected with the main valve cavity; the one-way valve is arranged in the third through opening and only allows fluid to flow in the third through opening in a one-way mode. According to the three-way valve and the gas water heater, the water cut-off temperature rise can be effectively reduced, the assembly efficiency is high, and the occupied space is small.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, in particular to a three-way valve and a gas water heater. Background Art

[0002] Gas water heaters are commonly used household hot water equipment and are widely loved by users because of their fast heating speed. However, if the gas water heater is briefly turned off and then turned on during use, the residual heat in its heat exchanger will continue to heat the water in the pipe, causing the instantaneous water outlet temperature to be higher than the set temperature when it is turned on again, which means that the water supply will stop and the temperature will rise, affecting the user experience. For this reason, gas water heaters often use bypass pipe technology, that is, a thin copper tube is connected between the water inlet pipe and the water outlet pipe connected to the heat exchanger through a tee. The thin copper tube connects the water inlet pipe and the water outlet pipe to achieve heat exchange between cold and hot water, reducing the water supply stop and temperature rise. In order to prevent cold water from entering the water outlet pipe through the thin copper tube during normal bathing, a stop valve is usually provided on the thin copper tube.

[0003] However, the stop valves and tees are arranged in scattered positions, which not only occupies a large space but also increases the assembly nodes, affecting the assembly efficiency. Utility Model Content

[0004] One of the technical problems solved by the utility model is to provide a three-way valve, which can effectively solve the problems of large occupied space and low assembly efficiency caused by the separate arrangement of the existing three-way and stop valves.

[0005] The second technical problem solved by the utility model is to provide a gas water heater which can effectively solve the problem of temperature rise when water is cut off.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] A three-way valve comprises a main valve body, a bypass valve and a one-way valve, wherein the main valve body has a main valve cavity, a first port, a second port and a third port, the first port and the second port being connected through the main valve cavity; the bypass valve comprises a bypass valve core and a driving member, the bypass valve core is located within the main valve body and has a first position and a second position, the driving member is configured to drive the bypass valve core to switch between the first position and the second position, when the bypass valve core is in the first position, the third port is connected to the main valve cavity, and when the bypass valve core is in the second position, the third port is disconnected from the main valve cavity; the one-way valve is arranged in the third port, and the one-way valve only allows the fluid to flow in one direction in the third port.

[0008] Compared with the background technology, the three-way valve of the utility model has the following beneficial effects:

[0009] The three-way valve provided by the utility model integrates the bypass valve on a main valve body having a first port, a second port and a third port, occupies a small space, and during installation, it is only necessary to connect the third port to the bypass pipe of the gas water heater, and connect the first port and the second port in series with the water outlet pipe or the water inlet pipe of the gas water heater, thereby achieving high assembly efficiency.

[0010] In one embodiment, the main valve body also includes a separation tube arranged in the main valve cavity, one end of the separation tube is connected to the third port, when the bypass valve core is in the second position, it abuts against the end surface of the separation tube away from the third port, when the bypass valve core is in the first position, it is separated from the end surface of the separation tube away from the third port, and the main valve cavity is disconnected from or connected to the third port through the separation tube.

[0011] In one embodiment, the bypass valve is a solenoid valve.

[0012] In one embodiment, the third port and the bypass valve are respectively arranged on opposite sides of the main valve body, and the separation tube is arranged in a straight line; or, the movement direction of the third port and the bypass valve core is perpendicular, and the separation tube is arranged in an L shape.

[0013] In one embodiment, one end of the main valve body is open, the bypass valve is detachably arranged at the open end of the main valve body, and the bypass valve core enters into the main valve cavity from the open end.

[0014] In one embodiment, the three-way valve also includes a first external connector, and at least one of the first port, the second port and the third port forms a plug-in port, the plug-in port is sealed with the first external connector, and one end of the second external connector extends out of the main valve body.

[0015] In one embodiment, a first limiting step is provided in the third opening, and the third opening is the plug-in opening, and the one-way valve is sandwiched between the first limiting step and the first external connector.

[0016] In one embodiment, the three-way valve also includes a U-shaped limit member, both ends of which pass through the main valve body from the outside to the inside and are inserted into the plug-in port, a second limit step is provided in the plug-in port, and one end of the first external connector inserted in the plug-in port is clamped between the limit member and the second limit step.

[0017] In one embodiment, a claw is provided on the outer side wall of the main valve body, and the claw is engaged with the limit member.

[0018] The above second technical problem is solved by the following technical solution:

[0019] A gas water heater comprises a heat exchanger, a water inlet pipe, a water outlet pipe and a bypass pipe, wherein the water inlet pipe and the water outlet pipe are both connected to the heat exchanger, and also comprises the three-way valve as described above, wherein the first port and the second port are connected in series to the water outlet pipe, the bypass pipe is connected between the third port and the water inlet pipe, and the one-way valve only allows fluid to flow from the main valve chamber to the third port; or, the first port and the second port are connected in series to the water inlet pipe, the bypass pipe is connected between the third port and the water outlet pipe, and the one-way valve only allows fluid to flow from the third port to the main valve chamber.

[0020] Compared with the background technology, the gas water heater described in the utility model has the following beneficial effects: the gas water heater in the utility model can connect or disconnect the water inlet pipe and the water outlet pipe by switching the bypass valve core between the first position and the second position, thereby effectively solving the problem of temperature rise when water is stopped, and the setting of the one-way valve can reduce the possibility of cold water in the water inlet pipe entering the water outlet pipe when the user turns on the water for the second time, thereby avoiding a decrease in the heat absorption efficiency of the heat exchanger of the gas water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional structural schematic diagram of a three-way valve provided in Embodiment 1 of the present utility model;

[0022] Figure 2 A top view of a three-way valve provided in Embodiment 1 of the present utility model;

[0023] Figure 3 A schematic diagram of the explosion structure of the three-way valve provided in the first embodiment of the utility model;

[0024] Figure 4 A cross-sectional view of a bypass valve of a three-way valve provided in Embodiment 1 of the utility model when the bypass valve is in the first working position;

[0025] Figure 5 A cross-sectional view of the bypass valve of the three-way valve provided in the first embodiment of the utility model when it is in the second working position;

[0026] Figure 6 A cross-sectional view of a second external connector provided in Embodiment 1 of the present utility model;

[0027] Figure 7 A schematic diagram of the three-way structure of the second embodiment of the present utility model;

[0028] Figure 8 A cross-sectional view of a three-way valve provided in Embodiment 2 of the present utility model;

[0029] Fig. 9 A schematic diagram of the three-way valve provided in the third embodiment of the present invention;

[0030] Fig.10 This is a cross-sectional view of the three-way valve provided in Example 3 of the utility model.

[0031] Description of labels:

[0032] 1. Main valve body; 11. First opening; 12. Second opening; 13. Third opening; 14. Separating tube; 15. Second limiting step; 16. First limiting step; 17. Clamping claw; 1a. Main valve chamber; 1b. Mounting hole; 2. Bypass valve; 21. Driving member; 21a. Connecting hole; 22. Bypass valve core; 3. One-way valve; 31. One-way valve body; 311. Valve seat; 312. Guide sleeve; 32. One-way valve core; 33. Elastic member; 4. First external connector; 5. Second external connector; 6. Limiting member. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] Embodiment 1

[0038] refer to Figure 1-Figure 6 As shown, in this embodiment, a three-way valve is provided for installation on the water outlet pipe of a gas water heater. The three-way valve comprises a main valve body 1, a bypass valve 2 and a one-way valve 3. The main valve body 1 comprises a first port 11, a second port 12 and a third port 13. The first port 11, the second port 12 and the third port 13 are all provided with flow channels inside and intersect with a main valve cavity 1a provided in the main valve body 1. The first port 11 and the second port 12 are always connected through the main valve cavity 1a. The bypass valve 2 comprises a first port 11, a second port 12 and a third port 13. The bypass valve core 22 includes a bypass valve core 22 and a driving member. The bypass valve core 22 is located in the main valve body 1 and has a first position and a second position. The driving member is configured to drive the bypass valve core 22 to move between the first position and the second position. When the bypass valve core 22 is in the first position, the third port 13 is connected to the main valve cavity 1a. When the bypass valve core 22 is in the second position, the third port 13 is disconnected from the main valve cavity 1a. The one-way valve 3 is arranged in the third port 13, and only allows the fluid to flow from the main valve cavity 1a into the third port 13.

[0039] When installing the three-way valve, connect the first port 11 and the second port 12 in series to the water outlet pipe, and connect the third port 13 to the bypass pipe. The other end of the bypass pipe is connected to the water inlet pipe through a three-way connection. Since the bypass valve 2 is integrated in the main valve body 1, the time for installing the stop valve is saved, and the installation efficiency is high. Figure 4 and Figure 5As shown, when the user uses water for normal bathing, the bypass valve core 22 is in the second position, the third port 13 is disconnected from the main valve chamber 1a, the bypass pipe connected to the third port 13 is not connected to the water outlet pipe connected to the first port 11, and water flows through the first port 11 and the second port 12 and flows out of the water outlet pipe to be used by the user for bathing; when the user stops using water, the bypass valve core 22 switches to the first position, the third port 13 is connected to the main valve chamber 1a, and the first port 11 and the second port 12 are connected. The bypass pipe connected to the third port 13 is connected to the water outlet pipe connected to the first port 11 through the main valve cavity 1a. When the water pump of the gas water heater is running, the water in the water inlet pipe enters the heat exchanger of the gas water heater to absorb heat, and the high-temperature water in the water outlet pipe enters the water inlet pipe after passing through the first port 11 of the three-way valve, the main valve cavity 1a, the third port 13, and the bypass pipe to fully mix with the cold water, so that the user can effectively reduce the water stop temperature rise after turning on the water again to prevent scalding. Similarly, when the user turns on the water again, it takes a certain amount of time for the heat exchanger to heat the cold water to the target temperature. Since the high-temperature water in the water outlet pipe mixes with the cold water in the water inlet pipe, the outflowing water temperature can be prevented from being too low, which can effectively reduce the water stop temperature drop. Moreover, after the bypass valve core 22 switches to the first position, the one-way valve 3 arranged in the third port 13 only allows the fluid to flow from the main valve chamber 1a to the third port 13, which can prevent the water in the water inlet pipe from directly flowing back from the bypass pipe to the main valve chamber 1a without being heated when the user turns on the water for the second time, and then flowing from the second port 12 to the outlet of the water outlet pipe, thereby avoiding a reduction in the heat absorption efficiency of the heat exchanger.

[0040] Optionally, the third port 13 and the bypass valve 22 are respectively arranged on opposite sides of the main valve body 1, the first port 11 and the third port 13 are located on the same side of the main valve body 1 and are arranged in parallel, and the second port 12 is perpendicular to the movement direction of the third port 13 and the bypass valve core 22. The bypass valve core 22 can reciprocate along the axial direction of the third port 13 under the action of the driving member 21 to achieve the connection or disconnection of the third port 13 and the main valve chamber 1a.

[0041] refer to Figure 4 and Figure 5 As shown, the main valve body 1 also has a separation tube 14 arranged in the main valve cavity 1a, and the separation tube 14 is arranged to be linear, with a first end thereof connected to the third port 13, and a second end facing the bypass valve core 22. The bypass valve core 22 can disconnect the main valve cavity 1a and the third port 13 by blocking the separation tube 14, or can connect the main valve cavity 1a and the third port 13 by opening the separation tube 14. That is to say, when the bypass valve core 22 is in the second position, it abuts against the second end face of the separation tube 14, and when the bypass valve core 22 is in the first position, it is separated from the second end face of the separation tube 14.

[0042] In this embodiment, since the bypass valve core 22 can be switched between the first position and the second position by a slight movement, the bypass valve 2 adopts a solenoid valve, and its switching between the first position and the second position is achieved by turning on and off the power, with fast switching speed and low cost.

[0043] refer to Figure 3 and Figure 4 As shown, one end of the main valve body 1 is open, and the bypass valve 2 is detachably arranged at the open end of the main valve body 1, and the bypass valve core 22 enters the main valve cavity 1a from the open end. Specifically, a plurality of mounting holes 1b are arranged at the open end of the main valve body 1, and the bypass valve 2 is provided with a housing, and the housing has connecting holes 21a corresponding to the mounting holes 1b one by one, and at least one of the mounting holes 1b and the connecting holes 21a is a threaded hole, and the bypass valve 2 and the main valve body 1 are connected by screws penetrating the connecting holes 21a and the mounting holes 1b. The driving member 21 is arranged in the housing, and the driving member 21 includes an electromagnetic coil and a spring, and the electromagnetic coil is arranged around the bypass valve core 22, and the spring is arranged between one end of the bypass valve core 22 and the housing, and the electromagnetic coil is energized to drive the bypass valve core 22 to move downward, and the electromagnetic coil is de-energized, and the bypass valve core 22 moves upward and resets under the action of the spring, so that the bypass valve core 22 can realize the conversion between the first position and the second position.

[0044] More specifically, the bypass valve 2 adopts a normally closed electromagnetic valve. When the user uses water for normal bathing, the bypass valve 2 is not opened and is in the second position. When the user stops using water, the bypass valve 2 is opened and is in the first position. The electromagnetic valve belongs to the prior art and will not be described in detail in this embodiment. In other embodiments, the bypass valve 2 can also adopt an electric valve, with a stepping motor as the driving member 21 to drive the bypass valve core 22 to move.

[0045] In this embodiment, the one-way valve 3 includes a one-way valve body 31, a one-way valve core 32 and an elastic member 33. The one-way valve body 31 is inserted in the third port 13 and is sealed with the main valve body 1 via a sealing ring. A through one-way valve cavity is provided in the one-way valve body 31. The elastic member 33 is located in the one-way valve cavity and is preferably a spring, one end of which is connected to the one-way valve body 31 and the other end is connected to or abuts against the one-way valve core 32, so that the one-way valve core 32 maintains a tendency to move toward the main valve cavity 1a to block the one-way valve cavity.

[0046] refer to Figure 4 and Figure 5As shown, a valve seat 311 is provided at one end of the one-way valve body 31 close to the main valve cavity 1a, a one-way valve core 32 is provided in the one-way valve body 31, and an elastic member 33 is provided between the valve seat 311 and the one-way valve core 32, so that the one-way valve core 32 maintains a tendency to abut against the valve seat 311. When and only when the fluid flows from the one-way valve cavity close to the main valve cavity 1a to the one-way valve cavity away from the main valve cavity 1a, the resistance of the elastic member 33 can be overcome, so that the one-way valve core 32 is separated from the valve seat 311, thereby realizing the communication of the one-way valve cavity. Specifically, a guide sleeve 312 extending along the direction of the third opening 13 is provided inside the one-way valve body 31 away from the main valve cavity 1a. The guide sleeve 312 is connected to the inner wall of the one-way valve body 31 through a connection portion arranged at intervals around the guide sleeve 312, and one end of the one-way valve core 32 penetrates into the guide sleeve 312 and is slidably connected to the guide sleeve 312. More specifically, the axial cross-section of the one-way valve core 32 along the third opening 13 is T-shaped, one end of the elastic member 33 is abutted or connected to the one-way valve core 32, and the other end is connected to the guide sleeve 312, and the connecting part is a connecting rod, the first end of the connecting rod is connected to the guide sleeve 312, and the second end of the connecting rod is connected to the inner wall of the one-way valve body 31.

[0047] In other embodiments, the one-way valve core 32 is at least partially disposed outside the one-way valve body 31 and located at one end of the one-way valve body 31 away from the main valve cavity 1a, one end of the elastic member 33 is connected to the one-way valve body 31, and the other end is connected to the one-way valve core 32, and the elastic member 33 keeps the part of the one-way valve core 32 located outside the one-way valve body 31 in a tendency to abut against the end surface of the one-way valve body 31. When and only when the fluid flows from one end of the one-way valve cavity close to the main valve cavity 1a to the end away from the main valve cavity 1a, the resistance of the elastic member 33 can be overcome, and the one-way valve core 32 is separated from the end surface of the one-way valve body 31, thereby realizing the communication of the one-way valve cavity.

[0048] In this embodiment, at least one of the first port 11 , the second port 12 and the third port 13 of the three-way valve forms a plug-in port, in which the first external connector 4 is sealed and inserted, and one end of the first external connector 4 extends out of the main valve body 1 .

[0049] Optionally, the first port 11 and the third port 13 are both formed with plug-in ports, and the two first external connectors 4 are respectively sealed and inserted into the first port 11 and the third port 13 . At the same time, the three-way valve also includes a second external connector 5 , which is sleeved on the second port 12 .

[0050] Specifically, refer to Figure 2-Figure 4As shown, the first external joint 4 includes an axially connected plug-in portion and a connecting portion, the plug-in portions of the two first external joints 4 are respectively used to be inserted into the first opening 11 and the third opening 13 and to be sealed and connected to the first opening 11 and the third opening 13, the connecting portions of the two first external joints 4 are respectively used to connect the water outlet pipe and the bypass pipe, and the outer diameter of the plug-in portion is larger than the outer diameter of the connecting portion, thereby forming a connecting step at the connecting position of the plug-in portion and the connecting portion. In order to limit the first external connector 4, the three-way valve also includes a U-shaped limiting member 6, the two ends of the two limiting members 6 respectively pass through the main valve body 1 from the outside to the inside and are inserted into the first port 11 and the third port 13, the limiting member 6 abuts against the connecting step to limit the first external connector 4 from being separated from the main valve body 1. At the same time, the first port 11 and the third port 13 are both provided with a second limiting step 15, and the first external connector 4 abuts against the corresponding second limiting step 15 to limit the first external connector 4 from excessively penetrating into the first port 11 and the third port 13, that is, one end of the first external connector 4 inserted into the first port 11 and the third port 13 is clamped between the second limiting step 15 and the limiting member 6.

[0051] Based on the setting of the second limiting step 15, the end face of the one-way valve body 31 away from the main valve cavity 1a is flush with the step surface of the second limiting step 15 and abuts against the plug-in portion, so the plug-in portion also plays a role in limiting the one-way valve body 31. On this basis, in order to prevent the one-way valve body 31 from moving in the direction of the main valve cavity 1a, a first limiting step 16 is further provided in the third opening 13. The end face of the one-way valve body 31 close to the main valve cavity 1a abuts against the step surface of the first limiting step 16, that is, the one-way valve body 31 is sandwiched between the first limiting step 16 and the first external connector 4. Specifically, the first limiting step 16 is formed at the connection between the third opening 13 and the separation tube 14, that is, the effective water flow area of ​​the separation tube 14 is smaller than the effective water flow area of ​​the third opening 13.

[0052] refer to Figure 2 As shown, claws 17 are provided on the outer walls of the first opening 11 and the third opening 13 , and the limit member 6 is engaged with the claws 17 , thereby limiting the limit member 6 on the main valve body 1 and limiting the limit member 6 from being separated from the first opening 11 and the third opening 13 .

[0053] refer to Figure 1-Figure 3 As shown, the outer wall of the second external connector 5 is provided with a G1 / 2 national standard external thread to facilitate threaded connection with the water outlet pipe. In order to increase the contact area with the second opening 12 and achieve a limiting effect, the second external connector 5 is provided with vertical and horizontal protrusions inside, which can not only increase the friction resistance, but also improve the structural strength of the second external connector 5, so that it is not easy to fall off the second opening 12.

[0054] In this embodiment, the main valve body 1 is injection molded, and the second external connector 5 is placed in a mold before the main valve body 1 is injection molded, so that it is inseparable from the main valve body 1 and is integrally molded.

[0055] Embodiment 2

[0056] Different from the first embodiment, the elastic member 33 keeps the one-way valve core 32 moving away from the main valve chamber 1a to block the one-way valve chamber. The one-way valve 3 only allows the fluid to flow into the main valve chamber 1a from the third port 13. At this time, the three-way valve is used to be installed on the water inlet pipe of the gas water heater.

[0057] When installing the three-way valve, the third port 13 is connected to the bypass pipe, and the first port 11 and the second port 12 are connected in series with the water inlet pipe. When the user uses water for normal bathing, the bypass valve 2 is in the second position, the third port 13 is disconnected from the main valve chamber 1a, and the bypass pipe connected to the third port 13 is not connected to the water inlet pipe connected to the first port 11. Water flows into the main valve chamber 1a through the second port 12 and then re-flows into the water inlet pipe through the first port 11, and then is normally heated in the heat exchanger and supplied to the user through the water outlet pipe; when the user stops using water, the bypass valve 2 is switched to the first position, the third port 13 is connected to the main valve chamber 1a, and the bypass pipe connected to the third port 13 is connected to the water inlet pipe connected to the first port 11. Under the operation of the water pump of the gas water heater, the water in the water inlet pipe enters the heat exchanger of the gas water heater to absorb heat, and the high-temperature water in the water outlet pipe enters the water inlet pipe through the bypass pipe, the third port 13 of the three-way valve, the main valve chamber 1a, and the first port 11 to be fully mixed with the cold water, so that the temperature rise can be effectively reduced after the user turns on the water again to prevent scalding. At this time, the one-way valve 3 arranged in the third port 13 only allows the fluid to flow from the third port 13 to the main valve chamber 1a, which can prevent the water in the water inlet pipe from flowing back to the main valve chamber 1a from the water inlet pipe without being heated when the user turns on the water for the second time, and then flowing from the third port 13 to the bypass pipe and finally to the water outlet pipe.

[0058] Embodiment 3

[0059] refer to Figure 7-Figure 8 As shown, different from the first or second embodiment, the first port 11 and the third port 13 are coaxially arranged at opposite ends of the main valve body 1 and perpendicular to the movement direction of the bypass valve core 22, and the second port 12 is perpendicular to the movement direction of the first port 11 and the bypass valve core 22. On this basis, the partition tube 14 is set to be L-shaped.

[0060] Embodiment 4

[0061] refer to Figure 9-10 As shown, different from the first or second embodiment, the third port 13 is perpendicular to the first port 11 and the movement direction of the bypass valve core 22. On this basis, the partition tube 14 is also set to be L-shaped.

[0062] Embodiment 5

[0063] In this embodiment, a gas water heater is proposed, including a heat exchanger, a water inlet pipe, a water outlet pipe, a bypass pipe and any three-way valve in Embodiment 1, Embodiment 3 based on Embodiment 1, or Embodiment 4 based on Embodiment 1. The water inlet pipe and the water outlet pipe are both connected to the heat exchanger, the first port 11 and the second port 12 of the three-way valve are connected in series to the water outlet pipe, and the bypass pipe is connected between the third port and the water inlet pipe.

[0064] In order to make the three-way valve respond in time when the user stops using water, the gas water heater also includes a controller and a monitoring component electrically connected to the controller. The three-way valve is connected to the controller for communication. The monitoring component is used to monitor whether the user stops using water. The monitoring component includes but is not limited to a flow sensor or a pressure sensor. When the user stops using water, the controller of the gas water heater receives the monitoring component signal and outputs a signal to the three-way valve. The bypass valve core 22 in the three-way valve switches from the second position to the first position, thereby achieving a bypass effect of connecting the water inlet pipe and the water outlet pipe.

[0065] Embodiment 6

[0066] A gas water heater is proposed in this embodiment. Different from the fifth embodiment, the gas water heater includes any three-way valve in the second embodiment or the third embodiment based on the second embodiment or the fourth embodiment based on the second embodiment. The first port 11 and the second port 12 of the three-way valve are connected in series to the water inlet pipe, and the bypass pipe is connected between the third port 13 and the water outlet pipe.

[0067] The gas water heaters in Examples 5 and 6 can reduce the temperature rise and the temperature drop when the water is stopped when the user turns on the water twice in a short time, which improves the user experience and comfort. In addition, all water flows in the normal working station can flow out from the water outlet pipe after absorbing heat from the heat exchanger through the water inlet pipe, thereby improving the heat exchange efficiency of the heat exchanger. In addition, the structure is simple, the cost is low, and it is easy to install and disassemble.

[0068] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The specific contents of the above specific implementations only express several implementations of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. Three-way valve, characterized in that, include: A main valve body (1), the main valve body (1) having a first opening (11), a second opening (12) and a third opening (13), the first opening (11) and the second opening (12) being connected via a main valve chamber (1a) provided in the main valve body (1); A bypass valve (2), the bypass valve (2) comprising a bypass valve core (22) and a driving member (21), the bypass valve core (22) being located in the main valve body (1) and having a first position and a second position, the driving member (21) being configured to drive the bypass valve core (22) to switch between the first position and the second position, when the bypass valve core (22) is in the first position, the third port (13) is connected to the main valve chamber (1a), and when the bypass valve core (22) is in the second position, the third port (13) is disconnected from the main valve chamber (1a); A one-way valve (3), wherein the one-way valve (3) is arranged in the third port (13), and the one-way valve (3) only allows the fluid to flow in one direction in the third port (13).

2. The three-way valve according to claim 1, characterized in that: The main valve body (1) also has a separation tube (14) arranged in the main valve chamber (1a), and the first end of the separation tube (14) is connected to the third port (13). When the bypass valve core (22) is in the second position, the bypass valve core (22) abuts against the second end of the separation tube (14). When the bypass valve core (22) is in the first position, the bypass valve core (22) is separated from the second end face of the separation tube (14), and the main valve chamber (1a) is disconnected from the third port through the separation tube (14).

3. The three-way valve according to claim 2, characterized in that: The bypass valve (2) is a solenoid valve.

4. The three-way valve according to claim 2, characterized in that: The third port (13) and the bypass valve (2) are respectively arranged on opposite sides of the main valve body (1), and the partition pipe (14) is arranged in a straight line; Alternatively, the third port (13) and the bypass valve core (22) are moved in a direction perpendicular to each other, and the partition tube (14) is configured to be L-shaped.

5. The three-way valve according to claim 1, characterized in that: One end of the main valve body (1) is open, the bypass valve (2) is detachably arranged at the open end of the main valve body (1), and the bypass valve core (22) enters the main valve chamber (1a) from the open end.

6. The three-way valve according to any one of claims 1 to 5, characterized in that: The three-way valve further comprises a first external connector (4), wherein at least one of the first port (11), the second port (12) and the third port (13) forms a plug-in port, wherein the first external connector (4) is sealably inserted into the plug-in port, and one end of the first external connector (4) extends out of the main valve body (1).

7. The three-way valve according to claim 6, characterized in that: A first limiting step (16) is arranged in the third opening (13), and the third opening (13) is the plug-in opening. The one-way valve (3) is sandwiched between the first limiting step (16) and the first external connector (4).

8. The three-way valve according to claim 6, characterized in that: The three-way valve further comprises a U-shaped limiting member (6), both ends of which pass through the main valve body (1) from outside to inside and are inserted into the plug-in port, a second limiting step (15) is arranged in the plug-in port, and one end of the first external connector (4) inserted in the plug-in port is clamped between the limiting member (6) and the second limiting step (15).

9. The three-way valve according to claim 8, characterized in that: The outer side wall of the main valve body (1) is provided with a clamping claw (17), and the clamping claw (17) is clamped with the limiting member (6).

10. A gas water heater, comprising a heat exchanger, a water inlet pipe, a water outlet pipe and a bypass pipe, wherein the water inlet pipe and the water outlet pipe are both connected to the heat exchanger, characterized in that: It also includes a three-way valve as described in any one of claims 1 to 9, wherein the first port (11) and the second port (12) are connected in series to the water outlet pipe, the bypass pipe is connected between the third port (13) and the water inlet pipe, and the one-way valve (3) only allows fluid to flow from the main valve chamber (1a) to the third port (13); or, the first port (11) and the second port (12) are connected in series to the water inlet pipe, the bypass pipe is connected between the third port (13) and the water outlet pipe, and the one-way valve (3) only allows fluid to flow from the third port (13) to the main valve chamber (1a).

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