Valve device and gas water heater

Abstract

This utility model discloses a valve device and a gas water heater, relating to the field of water heater technology. The valve device includes a valve body and a valve core assembly. The valve body has a valve cavity and inlet channels, a first outlet channel, and a second outlet channel communicating with the valve cavity. The first outlet channel has a first water inlet communicating with the valve cavity, and the second outlet channel has a second water inlet communicating with the valve cavity. The first water inlet is located on the peripheral wall of the valve cavity. The valve core assembly is rotatably disposed in the valve cavity. The valve core assembly includes a first valve core and a second valve core spaced axially apart. The first valve core rotates with the peripheral wall of the valve cavity to block or open the first water inlet, thereby adjusting the conduction area between the valve cavity and the first outlet channel. The second valve core blocks or opens the second water inlet to adjust the conduction area between the valve cavity and the second outlet channel. This utility model's technical solution can reduce the fluctuation range of the gas water heater's outlet water temperature and improve its constant temperature performance.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, and in particular to a valve device and a gas water heater. Background Technology

[0002] As people's living standards continue to improve, their pursuit of bathing comfort is increasing. Gas water heaters, with their fast heating speed and large water volume, have become the preferred type of water heater for many users.

[0003] However, gas water heaters in related technologies have problems such as fluctuating water temperature when the water volume fluctuates, and large fluctuations in outlet water temperature when the water is turned off and then turned on again during use, such as the water being hot at first and then cold. Utility Model Content

[0004] The main purpose of this invention is to propose a valve device and a gas water heater, which aims to reduce the fluctuation range of the outlet water temperature of the gas water heater and improve the constant temperature performance.

[0005] To achieve the above objectives, the valve device proposed in this utility model includes:

[0006] The valve body includes a valve cavity and an inlet channel, a first outlet channel, and a second outlet channel communicating with the valve cavity. The first outlet channel has a first water inlet communicating with the valve cavity, and the second outlet channel has a second water inlet communicating with the valve cavity. The first water inlet is located on the peripheral wall of the valve cavity.

[0007] A valve core assembly is rotatably disposed in the valve cavity; the valve core assembly includes a first valve core and a second valve core spaced axially apart, the first valve core being rotatably engaged with the peripheral wall of the valve cavity to block or open the first water inlet, thereby adjusting the conduction area between the valve cavity and the first water outlet channel, and the second valve core being used to block or open the second water inlet to adjust the conduction area between the valve cavity and the second water outlet channel.

[0008] In one embodiment of this application, when the conductive area between the valve cavity and the first water outlet channel increases, the conductive area between the valve cavity and the second water outlet channel decreases.

[0009] When the conductive area between the valve cavity and the first water outlet channel decreases, the conductive area between the valve cavity and the second water outlet channel increases.

[0010] In one embodiment of this application, the outer peripheral surface of the first valve core rotates and engages with the peripheral wall surface of the valve cavity to block or open the first water inlet.

[0011] In one embodiment of this application, the first valve core is a cylinder; the end of the first valve core near the second valve core is open, and the end away from the second valve core is closed, and a flow cavity communicating with the valve cavity is formed inside the first valve core;

[0012] The first valve core has a flow hole on its peripheral wall that connects to the flow cavity. When the first valve core rotates, it can drive the flow hole to move relative to the first water inlet, so as to adjust the overlap area between the flow hole and the first water inlet.

[0013] In one embodiment of this application, the flow passage extends circumferentially along the first valve core.

[0014] In one embodiment of this application, the flow hole has a first end and a second end along the circumferential direction, and the opening area at the first end is larger than the opening area at the second end.

[0015] The opening area of ​​the flow passage gradually decreases from the first end to the second end.

[0016] In one embodiment of this application, the first valve core further includes a support rod and a plurality of reinforcing ribs. One end of the support rod is connected to the closed end of the first valve core, and the other end extends axially into the flow cavity. The plurality of reinforcing ribs are spaced apart on the outer periphery of the support rod and connected to the inner wall of the first valve core.

[0017] In one embodiment of this application, the first valve core is a stop block, and the outer peripheral surface of the first valve core is an arc surface or a spherical surface.

[0018] In one embodiment of this application, the outer peripheral surface of the first valve core is an arc surface; the central angle A1 corresponding to the outer peripheral surface of the first valve core satisfies: 80°≤A1≤180°.

[0019] In one embodiment of this application, the second water inlet extends axially along the valve cavity, and the second valve core rotates within the valve cavity to block or open the second water inlet.

[0020] In one embodiment of this application, a baffle plate is provided inside the valve body, and the baffle plate is located at one axial end of the valve cavity to separate the second water outlet channel from the valve cavity;

[0021] The periphery of the baffle plate is connected to the peripheral wall of the valve cavity, and the second water inlet is formed by an opening in the baffle plate; or, the baffle plate has a notch, and the notch and the peripheral wall of the valve cavity enclose the second water inlet.

[0022] The axial end face of the second valve core rotates with the baffle plate to block or open the second water inlet.

[0023] In one embodiment of this application, the second valve core is a baffle; the second valve core is provided with a flow port, and when the second valve core rotates, it can drive the flow port to move relative to the second water inlet, so as to adjust the overlap area between the flow port and the second water inlet.

[0024] In one embodiment of this application, the outer peripheral surface of the second valve core is an arc surface, and the central angle A2 corresponding to the outer peripheral surface of the second valve core satisfies 180°≤A2≤280°.

[0025] In one embodiment of this application, the shield plate is provided with a mounting hole, and the axial end face of the second valve core is provided with a protruding shaft, which is rotatably fitted into the mounting hole.

[0026] In one embodiment of this application, the baffle plate and the valve body are integrally formed.

[0027] In one embodiment of this application, the valve core assembly further includes a connection structure connecting the first valve core and the second valve core;

[0028] The connection structure is a rotating shaft located at the rotation center of the valve core assembly; or, the connection structure includes a plurality of connecting rods connecting the first valve core and the second valve core, with the plurality of connecting rods arranged at intervals around the rotation center.

[0029] In one embodiment of this application, the first valve core, the second valve core, and the connecting structure are integrally formed.

[0030] In one embodiment of this application, the valve body is further provided with an installation port communicating with the valve cavity, and the valve device further includes a fixing sleeve that is sealed and installed in the installation port, the fixing sleeve being provided with an assembly hole;

[0031] The valve core assembly further includes a drive shaft connected to the first valve core. The drive shaft of the valve core assembly is sealed to the mounting hole and extends out of the fixing sleeve.

[0032] The valve device further includes a drive assembly mounted on the fixed sleeve, the drive assembly being drivenly connected to the transmission shaft of the valve core assembly to drive the valve core assembly to rotate.

[0033] In one embodiment of this application, the assembly hole is provided with a first limiting part, and the transmission shaft is provided with a second limiting part; the second limiting part is used to limit the rotation angle of the transmission shaft by engaging with the first limiting part.

[0034] To achieve the above objectives, this application also provides a gas water heater, including an inlet pipe, an outlet pipe, a heat exchanger, and the aforementioned valve device. The inlet channel is connected to the inlet pipe, and one of the first outlet channel and the second outlet channel is connected to the inlet end of the heat exchanger, while the other is connected to the outlet pipe.

[0035] In this utility model's valve device, the valve body has a valve cavity and an inlet channel, a first outlet channel, and a second outlet channel communicating with the valve cavity. The first outlet channel communicates with the valve cavity through a first inlet, and the second outlet channel communicates with the valve cavity through a second inlet. A rotatable valve core assembly is provided within the valve cavity. This valve core assembly has a first valve core and a second valve core axially spaced apart. By placing the first inlet on the peripheral wall of the valve cavity, the first valve core rotates to block or open the first inlet, adjusting the conduction area between the valve cavity and the first outlet channel. The second valve core blocks or opens the second inlet, thus adjusting the conduction area between the valve cavity and the second outlet channel, thereby achieving the water distribution function of the first and second outlet channels. When this valve device is applied to a gas water heater, it can adjust the water flow of the first and second outlet channels according to different operating conditions of the gas water heater, improving water temperature fluctuations and enhancing temperature stability. Furthermore, by placing the first water inlet on the peripheral wall of the valve cavity, this embodiment can reduce water flow resistance and ensure water flow rate. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 structures shown in these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of an embodiment of the valve device of this utility model;

[0038] Figure 2 This is a cross-sectional view of an embodiment of the valve device of this utility model;

[0039] Figure 3 This is an exploded view of an embodiment of the valve device of this utility model;

[0040] Figure 4 This is a schematic diagram of the structure of one embodiment of the valve core assembly in this utility model;

[0041] Figure 5 for Figure 4 Another perspective on the embodiments;

[0042] Figure 6 This is a cross-sectional view of another embodiment of the valve device of this utility model;

[0043] Figure 7 This is a schematic diagram of another embodiment of the valve core assembly in this utility model.

[0044] Figure 8 for Figure 7 Another perspective on the embodiments;

[0045] Figure 9 This is a schematic diagram of the valve body from another perspective in an embodiment of this utility model;

[0046] Figure 10 This is a schematic diagram of the assembly of the drive shaft and the fixed assembly in an embodiment of this utility model;

[0047] Figure 11 This is a schematic diagram of an embodiment of the gas water heater of this utility model.

[0048] Explanation of icon numbers:

[0049]

[0050]

[0051] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0052] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0053] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0054] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0055] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0056] Gas water heaters in related technologies often experience significant fluctuations in outlet water temperature during use, mainly due to the following reasons: 1. Temperature rise during water outage: When the water is turned off, the heat stored in the heat exchanger heats the water to a very high temperature, leading to excessively high outlet water temperature when the water is turned back on; 2. Fluctuations during restart: When the water is turned off and then turned back on during use, the aforementioned temperature rise during water outage may occur, resulting in excessively high outlet water temperature. Additionally, the equipment requires a certain amount of time to start up, and the cold water cannot be heated to the required temperature instantly. Therefore, the outlet water temperature will first rise, then fall, and finally remain constant, resulting in fluctuating water temperature; 3. Fluctuations in water volume leading to fluctuating outlet water temperature.

[0057] Based on this, this application provides a valve device 100, which is applied in a gas water heater, such as... Figure 11 The gas water heater includes an inlet pipe 200, an outlet pipe 300, and a heat exchanger 400. A valve device 100 is connected between the inlet pipe 200, the inlet end of the heat exchanger 400, and the outlet pipe 300. By adjusting the amount of water entering the inlet end of the heat exchanger 400 and the outlet pipe 300, the fluctuation of the outlet water temperature is improved, and the constant temperature performance is enhanced. The structure of this valve device 100 will be described below by way of an embodiment.

[0058] like Figures 1 to 3 As shown, the valve device 100 includes a valve body 1 and a valve core assembly 2.

[0059] The valve body 1 is provided with a valve cavity 101 and an inlet channel 11, a first outlet channel 12 and a second outlet channel 13 communicating with the valve cavity 101. The first outlet channel 12 has a first water inlet 121 communicating with the valve cavity 101, and the second outlet channel 13 has a second water inlet 131 communicating with the valve cavity 101. The first water inlet 121 is located on the peripheral wall surface 101a of the valve cavity 101. The valve core assembly 2 is rotatably disposed in the valve cavity 101. The valve core assembly 2 includes a first valve core 21 and a second valve core 22 spaced axially. The first valve core 21 is rotatably engaged with the peripheral wall surface 101a of the valve cavity 101 to block or open the first water inlet 121 to adjust the conduction area between the valve cavity 101 and the first outlet channel 12. The second valve core 22 is used to block or open the second water inlet 131 to adjust the conduction area between the valve cavity 101 and the second outlet channel 13.

[0060] In this embodiment, the valve body 1 serves as the outer shell of the valve device 100. The valve body 1 is provided with a valve cavity 101, an inlet channel 11, a first outlet channel 12, and a second outlet channel 13. It can be understood that water flowing into the valve cavity 101 from the inlet channel 11 can flow out through the first outlet channel 12 and / or the second outlet channel 13. Specifically, the first outlet channel 12 is connected to the valve cavity 101 through the first water inlet 121, and the second outlet channel 13 is connected to the valve cavity 101 through the second water inlet 131. The flow area of ​​the first water inlet 121 and the flow area of ​​the second water inlet 131 can be adjusted by the valve core assembly 2 provided in the valve cavity 101, so as to adjust the conduction area between the valve cavity 101 and the first outlet channel 12, and the conduction area between the valve cavity 101 and the second outlet channel 13, thereby adjusting the water output of the first outlet channel 12 and the second outlet channel 13. In practical applications, the inlet channel 11 can be selected as an inlet pipe, and the first outlet channel 12 and the second outlet channel 13 can be selected as outlet pipes to facilitate pipe installation.

[0061] It should be noted that in this embodiment, the valve cavity 101, the inlet channel 11, the first outlet channel 12, and the second outlet channel 13 are all formed in the valve body 1. The inlet channel 11, the first outlet channel 12, and the second outlet channel 13 are independent of the valve cavity 101 and are connected to the valve cavity 101 through corresponding water inlets. Specifically, the first water inlet 121 is located at the connection between the first outlet channel 121 and the valve cavity 101, the second water inlet 131 is located at the connection between the second outlet channel 131 and the valve cavity 101, and the inlet water inlet 111 is located at the connection between the inlet channel 11 and the valve cavity 101. That is, the valve cavity 101 and the first outlet channel 121 are located on both sides of the first water inlet 121, the valve cavity 101 and the second outlet channel 131 are located on both sides of the second water inlet 131, and the valve cavity 101 and the inlet channel 11 are located on both sides of the inlet water inlet 111.

[0062] Understandably, the relative positions of the inlet channel 11, the first outlet channel 12, and the second outlet channel 13 with the valve chamber 101 can be determined according to actual conditions. For example, one or two of the inlet channel 11, the first outlet channel 12, and the second outlet channel 13 may be located along the axial direction of the valve chamber 101, and the remaining ones may be located at an angle to the axial direction of the valve chamber 101; alternatively, the inlet channel 11, the first outlet channel 12, and the second outlet channel 13 may all be located along the axial direction of the valve chamber 101 or all may be located at an angle to the axial direction of the valve chamber 101. As an example, such as... Figure 2 As shown, valve cavity 101 is a cavity whose axial direction is parallel to the plane of the paper and extends laterally. Water inlet channel 11 is a channel that extends approximately radially along valve cavity 101 (i.e., water inlet channel 11 extends radially along valve cavity 101 or is slightly inclined), and communicates with valve cavity 101 through water inlet port 111. In some embodiments, water inlet port 111 is located on the peripheral wall of valve cavity 101. First water outlet channel 12 is a channel that extends approximately radially along valve cavity 101 (i.e., first water outlet channel 12 extends radially along valve cavity 101 or is slightly inclined), and communicates with valve cavity 101 through first water inlet port 121. In some embodiments... The first water inlet 121 is located on the peripheral wall of the valve cavity 101; the second water outlet channel 13 is a channel that extends approximately radially along the valve cavity 101 (i.e., the second water outlet channel 13 extends radially along the valve cavity 101 or is slightly inclined), and communicates with the valve cavity 101 through the second water inlet 131. In some embodiments, the second water inlet 131 may be located on the peripheral wall of the valve cavity 101 or at one axial end. It should be noted that when the second water inlet 131 is located at one axial end of the valve cavity 101, the second water outlet channel 13 is located on one axial side of the valve cavity 101, and the second water inlet 131 is located on the side wall of the second water outlet channel 13.

[0063] The valve core assembly 2 is rotatably disposed in the valve cavity 101. The valve core assembly 2 includes a first valve core 21 and a second valve core 22 spaced axially. Both the first valve core 21 and the second valve core 22 can rotate within the valve cavity 101. The first valve core 21 cooperates with the first water inlet 121 to regulate the flow rate of the first water outlet channel 12, and the second valve core 22 cooperates with the second water inlet 131 to regulate the flow rate of the second water outlet channel 13. It can be understood that this valve device 100 achieves the function of distributing the water flow rate through the rotational movement of the valve core assembly 2. To facilitate the rotational movement of the valve core assembly 2, the valve cavity 101 can be configured as a cylindrical cavity, with the valve core assembly 2 rotating around the central axis of the valve cavity 101. The first valve core 21 and the second valve core 22 are spaced apart axially in the valve cavity 101, and both the first valve core 21 and the second valve core 22 can rotate around the central axis of the valve cavity 101. Optionally, the first valve core 21 and the second valve core 22 can rotate synchronously or asynchronously.

[0064] In practical applications, the way the first valve core 21 and the first water inlet 121 are matched can be determined according to the actual situation. For example, the first water inlet 121 can be located on the peripheral wall surface 101a of the valve cavity 101. In this case, the outer peripheral surface of the first valve core 21 can be rotated and matched with the peripheral wall surface 101a of the valve cavity 101 to block or open the first water inlet 121. Alternatively, the first water inlet 121 can be located on the end wall surface of the valve cavity 101. In this case, the end face of the first valve core 21 can be rotated and matched with the end wall surface of the valve cavity 101 to block or open the first water inlet 121. Or there can be some other matching methods. Correspondingly, the cooperation method between the second valve core 22 and the second water inlet 131 can also be determined according to the actual situation. For example, the second water inlet 131 can be located on the peripheral wall surface 101a of the valve cavity 101. In this case, the outer peripheral surface of the second valve core 22 can be rotatably cooperated with the peripheral wall surface 101a of the valve cavity 101 to block or open the second water inlet 131. Alternatively, the second water inlet 131 can be located on the end wall surface of the valve cavity 101. In this case, the end face of the second valve core 22 can be rotatably cooperated with the end wall surface of the valve cavity 101 to block or open the second water inlet 131.

[0065] It should be noted that the first water inlet 121 in this embodiment is provided on the peripheral wall surface 101a of the valve cavity 101. This does not mean that a specific water inlet is provided on the peripheral wall surface 101a of the valve cavity 101. Rather, for ease of explanation, the two water inlets are named the first water inlet 121 and the second water inlet 131, respectively. Therefore, in practical applications, at least one of the first water inlet 121 and the second water inlet 131 can be provided on the peripheral wall surface 101a of the valve cavity 101. In this case, the corresponding first valve core 21 and / or second valve core 22 rotate and engage with the peripheral wall surface 101a of the valve cavity 101. This design ensures that at least one water inlet has a water-blocking direction that is radial to the valve cavity 101, and the corresponding water flow direction is also radial. Therefore, when the water flowing into the valve cavity 101 from the inlet channel flows axially, it will not directly impact the valve core. Compared to two valve cores having axial water blocking, where the water flow is more likely to impact the valve core axially and cause eddies, this embodiment can avoid the generation of eddies, reduce water flow resistance, and ensure flow rate.

[0066] In practical applications, the shape and structure of the first water inlet 121 can be determined according to the actual situation, such as being circular, fan-shaped, square, strip-shaped, or other shapes. The shape and structure of the second water inlet 131 can also be determined according to the actual situation, such as being circular, fan-shaped, square, strip-shaped, or other shapes.

[0067] When this valve device 100 is applied to a water heater, the inlet channel 11 is connected to the inlet pipe 200, and one of the first outlet channel 12 and the second outlet channel 13 is connected to the inlet end of the heat exchanger 400, while the other is connected to the outlet pipe 300. The following explanation uses the example of the first outlet channel 12 being connected to the inlet end of the heat exchanger 400 and the second outlet channel 13 being connected to the outlet pipe 300 as an example:

[0068] Regarding the temperature rise during water outages, when the water heater is turned on again after being turned off, the valve core assembly 2 rotates. The first valve core 21 rotates to block the first water inlet 121, reducing the conduction area between the valve chamber 101 and the first water outlet channel 12. The second valve core 22 rotates to open the second water inlet 131, increasing the conduction area between the valve chamber 101 and the second water outlet channel 13. This allows more cold water to flow out from the second water outlet and into the water outlet pipe 300, thereby reducing the overall water outlet temperature, solving the problem of temperature rise during water outages, and preventing users from being scalded by hot water.

[0069] Regarding fluctuations during secondary startup, when the water heater is turned off and then turned on again, the valve core assembly 2 rotates, reducing the flow area of ​​the first water inlet 121 and increasing the flow area of ​​the second water inlet 131. This lowers the outlet water temperature to the required temperature, mitigating the issue of temperature rise during water outages. Then, after the device starts up, the valve core assembly 2 continues to rotate, increasing the flow area of ​​the first water inlet 121 and decreasing the flow area of ​​the second water inlet 131. This reduces the amount of cold water mixed into the outlet pipe 300, preventing excessive drops in the overall outlet water temperature. Therefore, the water temperature at the user's end is kept stable during secondary startup, avoiding sudden temperature changes.

[0070] Regarding water flow fluctuations, when the water flow suddenly increases, the water temperature will decrease. At this time, the valve core assembly 2 rotates, reducing the flow area of ​​the second water inlet 131 and decreasing the amount of cold water mixed into the outlet pipe 300, thus preventing the outlet water temperature from dropping too much. Conversely, when the water flow suddenly decreases, the water temperature will rise. At this time, the valve core assembly 2 rotates, increasing the flow area of ​​the second water inlet 131 and increasing the amount of cold water mixed into the outlet pipe 300, thus preventing the outlet water temperature from rising too much. This ensures a stable water temperature at the user's end when the water flow fluctuates.

[0071] In summary, in the valve device 100 of this utility model, the valve body 1 is provided with a valve cavity 101 and an inlet channel 11, a first outlet channel 12, and a second outlet channel 13 communicating with the valve cavity 101. The first outlet channel 12 communicates with the valve cavity 101 through a first water inlet 121, and the second outlet channel 13 communicates with the valve cavity 101 through a second water inlet 131. A rotatable valve core assembly 2 is provided inside the valve cavity 101. The valve core assembly 2 has an axially spaced first valve core 21 and a second valve core 22. The valve core 22, by placing the first water inlet 121 on the peripheral wall surface 101a of the valve cavity 101, rotates with the peripheral wall surface 101a of the valve cavity 101 to block or open the first water inlet 121, adjusting the conduction area between the valve cavity 101 and the first water outlet channel 12. The second valve core 22 blocks or opens the second water inlet 131 to adjust the conduction area between the valve cavity 101 and the second water outlet channel 13, thereby realizing the water distribution function of the first water outlet channel 12 and the second water outlet channel 13. When the valve device 100 of this embodiment is applied to a gas water heater, it can adjust the water flow of the first water outlet channel 12 and the second water outlet channel 13 according to different operating conditions of the gas water heater, which can improve the water temperature fluctuation and enhance the constant temperature performance. In addition, by placing at least one water inlet on the peripheral wall surface 101a of the valve cavity 101, this embodiment can reduce water flow resistance and ensure water flow rate.

[0072] In one embodiment of this application, when the conductive area between the valve cavity 101 and the first water outlet channel 12 increases, the conductive area between the valve cavity 101 and the second water outlet channel 13 decreases; when the conductive area between the valve cavity 101 and the first water outlet channel 12 decreases, the conductive area between the valve cavity 101 and the second water outlet channel 13 increases.

[0073] In this embodiment, the relationship between the conduction area of ​​valve cavity 101 and the first water outlet channel 12 and the conduction area of ​​valve cavity 101 and the second water outlet channel 13 can be linearly inversely correlated or nonlinearly inversely correlated.

[0074] With this configuration, the total flow rate entering the valve chamber 101 from the inlet channel 11 can be equal to the sum of the flow rates of the water flowing out from the two outlet channels.

[0075] In practical applications, the inverse correlation between the two conduction areas can be achieved by setting the positions of the first water inlet 121 and the second water inlet 131, as well as the positions of the first valve core 21 and the second valve core 22. For example, when the first water inlet 121 and the second water inlet 131 are both located on the peripheral wall 101a of the valve cavity 101, and the first water inlet 121 and the second water inlet 131 are located on the same side of the peripheral wall 101a of the valve cavity 101, the first valve core 21 and the second valve core 22 can be respectively located on both sides of the central axis of the valve cavity 101, so that when the valve core assembly 2 rotates, the blocking areas of the first valve core 21 and the second valve core 22 on the first water inlet 121 and the second water inlet 131 are inversely related; or, the first water inlet 121 and the second water inlet 131 are located on opposite sides of the peripheral wall 101a of the valve cavity 101, the first valve core 21 and the second valve core 22 can be respectively located on the same side of the central axis of the valve cavity 101, so that when the valve core assembly 2 rotates, the blocking areas of the first valve core 21 and the second valve core 22 on the first water inlet 121 and the second water inlet 131 are inversely related. For example, when the first water inlet 121 is located on the peripheral wall 101a of the valve cavity 101 and the second water inlet 131 is arranged along the axial direction of the valve cavity 101, the first water inlet 121 and the second water inlet 131 are located on the same side of the central axis of the valve cavity 101. In this case, the first valve core 21 and the second valve core 22 can be arranged on both sides of the central axis of the valve cavity 101, so that when the valve core assembly 2 rotates, the blocking areas of the first valve core 21 and the second valve core 22 on the first water inlet 121 and the second water inlet 131 are inversely related. Alternatively, when the first water inlet 121 and the second water inlet 131 are located on both sides of the central axis of the valve cavity 101, the first valve core 21 and the second valve core 22 can be arranged on the same side of the central axis of the valve cavity 101, so that when the valve core assembly 2 rotates, the blocking areas of the first valve core 21 and the second valve core 22 on the first water inlet 121 and the second water inlet 131 are inversely related.

[0076] As an example, such as Figure 2 and Figure 6 The first water inlet 121 is located on the peripheral wall surface 101a of the valve cavity 101. The outer peripheral surface of the first valve core 21 rotates with the peripheral wall surface 101a of the valve cavity 101 to block or open the first water inlet 121. The second water inlet 131 extends along the axial direction of the valve cavity 101. The second valve core 22 rotates in the valve cavity 101 to block or open the second water inlet 131.

[0077] In this embodiment, the first water inlet 121 is located on the peripheral wall surface 101a of the valve cavity 101. The outer peripheral surface of the first valve core 21 cooperates with the peripheral wall surface 101a of the valve cavity 101. When the first valve core 21 rotates, its outer peripheral surface can block or open the first water inlet 121, thereby adjusting the opening degree of the first water inlet 121. It is understood that the first water inlet 121 is a radial water passage, which can reduce the generation of eddies within the valve cavity 101 and lower resistance. The second water inlet 131 extends axially along the valve cavity 101. The axial end face of the second valve core 22 can block or open the second water inlet 131, thereby adjusting the opening degree of the second water inlet 131. It is understood that the second valve core 22 can be located upstream of the second water inlet 131, allowing water pressure to increase the sealing force of the second valve core 22 on the second water inlet 131.

[0078] Understandably, the specific structure of the first valve core 21 and the second valve core 22 can be determined according to the actual situation. The first valve core 21 and the second valve core 22 can be connected by a connecting structure 23 so that the first valve core 21 and the second valve core 22 can rotate together.

[0079] In one embodiment, such as Figures 2 to 5 The first valve core 21 is a cylinder 212; the end of the first valve core 21 near the second valve core 22 is open, and the end away from the second valve core 22 is closed, so that a flow cavity 213 communicating with the valve cavity 101 is formed inside the first valve core 21; a flow hole 214 connected to the flow cavity 213 is provided on the peripheral wall of the first valve core 21; when the first valve core 21 rotates, it can drive the flow hole 214 to move relative to the first water inlet 121, so as to adjust the overlap area between the flow hole 214 and the first water inlet 121.

[0080] In this embodiment, the outer peripheral surface of the first valve core 21 mates with the peripheral wall surface 101a of the valve cavity 101. The end of the first valve core 21 facing the second valve core 22 is open, and the end away from the second valve core 22 is closed. A flow-through hole 214 is provided on the peripheral wall of the first valve core 21. Water flowing in from the inlet channel 11 passes sequentially through the valve cavity 101, the flow-through cavity 213, the flow-through hole 214, and the first water inlet 121 before flowing out through the first outlet channel 12. It can be understood that when the first valve core 21 rotates, it can adjust the overlapping area of ​​the flow-through hole 214 and the first water inlet 121, thereby adjusting the conduction area between the valve cavity 101 and the first outlet channel 12. In this embodiment, by setting the first valve core 21 as a cylindrical structure 212, the axial impact of the water flow can be further reduced, the generation of eddies can be avoided, and the resistance can be reduced.

[0081] Furthermore, the flow passage 214 extends circumferentially along the first valve core 21. It can be understood that by extending the flow passage 214 circumferentially along the first valve core 21, the flow passage 214 can rotate along the peripheral wall 101a of the valve cavity 101 when it rotates, ensuring the smoothness of the adjustment of the conduction area between the valve cavity 101 and the first water outlet channel 12.

[0082] Furthermore, the flow passage 214 has a first end and a second end along the circumferential direction, with the opening area at the first end being larger than the opening area at the second end; the opening area of ​​the flow passage 214 gradually decreases from the first end to the second end. This configuration can improve the adjustment accuracy of the conduction area between the valve chamber 101 and the first water outlet channel 12, achieving a wider adjustment range.

[0083] Furthermore, the first valve core 21 also includes a support rod 215 and a number of reinforcing ribs 216. One end of the support rod 215 is connected to the end of the first valve core 21, and the other end extends axially into the flow cavity 213. The number of reinforcing ribs 216 are distributed at intervals on the outer periphery of the support rod 215 and connected to the inner wall of the first valve core 21.

[0084] In this embodiment, the support rod 215 serves to support several reinforcing ribs 216. The several reinforcing ribs 216 connect the support rod 215 and the inner wall of the cylinder 212, which can further improve the overall structural strength of the first valve core 21, ensure the structural stability during rotation, and prevent the part where the flow hole 214 is set from cracking due to insufficient material and reduced strength.

[0085] In another embodiment, such as Figures 6 to 8 The first valve core 21 is a stop block 211 structure. The outer circumferential surface of the first valve core 21 can be an arc surface or a spherical surface. Understandably, the first valve core 21 can be an arc block, a spherical block, a butterfly block, or some other shape structure.

[0086] Preferably, the outer peripheral surface of the first valve core 21 is an arc surface, so that the shape of the outer peripheral surface of the first valve core 21 matches the shape of the peripheral wall surface 101a of the valve cavity 101, ensuring better sealing force and reducing resistance. Optionally, the radial cross-section of the first valve core 21 is fan-shaped.

[0087] Furthermore, the central angle A1 corresponding to the outer circumference of the first valve core 21 satisfies: 80°≤A1≤180°. It is understandable that the central angle corresponding to the outer circumference of the first valve core 21 should not be too small or too large. If it is too small, it may not completely block the first water inlet 121, affecting the regulation of the water flow rate in the first water outlet channel 12; if it is too large, it may cause the first valve core 21 to rotate a relatively long angle before opening the first water inlet 121, affecting the regulation efficiency of the first water inlet 121. Based on this, in this embodiment, the central angle A1 corresponding to the outer circumference of the first valve core 21 is set to 80°≤A1≤180°. On the one hand, this ensures that the first valve core 21 can completely block the first water inlet 121; on the other hand, it ensures the regulation efficiency of the first water inlet 121 and prevents the situation where the first valve core 21 rotates for too long without being able to open the first water inlet 121. In practical applications, in order to ensure better adjustment effect, the central angle A1 corresponding to the outer peripheral surface of the first valve core 21 can be 120°≤A1≤165°, preferably, the central angle A1 is 160°.

[0088] Furthermore, in this embodiment, the first valve core 21 has a smaller mating area with the peripheral wall 101a of the valve cavity 101 compared to the cylindrical structure, which can reduce the motion resistance.

[0089] In one embodiment of this application, as Figure 2 , Figure 6 as well as Figure 9 A baffle plate 14 is provided inside the valve body 1. The baffle plate 14 is located at one axial end of the valve cavity 101 to separate the second water outlet channel 13 from the valve cavity 101. The periphery of the baffle plate 14 is connected to the peripheral wall surface 101a of the valve cavity 101. The second water inlet 131 is formed by an opening in the baffle plate 14. Alternatively, the baffle plate 14 is provided with a notch, which is surrounded by the peripheral wall surface 101a of the valve cavity 101 to form the second water inlet 131. The axial end face of the second valve core 22 is rotatably engaged with the baffle plate 14 to block or open the second water inlet 131.

[0090] A baffle plate 14 is provided inside the valve cavity 101. The baffle plate 14 separates the second water outlet channel 13 from the valve cavity 101. The second water inlet 131 is located on the baffle plate 14 or between the baffle plate 14 and the peripheral wall surface 101a of the valve cavity 101. It can be understood that the second water inlet 131 axially penetrates the baffle plate 14.

[0091] Optionally, when the periphery of the baffle plate 14 is connected to the peripheral wall surface 101a of the valve cavity 101, the second water inlet 131 is directly formed by an opening in the baffle plate 14. In this manner, when the second valve core 22 blocks the second water inlet 131, the second valve core 22 can cooperate with the plate surface around the second water inlet 131 to achieve a better water-blocking effect.

[0092] Optionally, the side of the baffle plate 14 is provided with a notch, which is used to form a second water inlet 131 by surrounding the peripheral wall surface 101a of the valve cavity 101. This design makes it easier to mold and manufacture.

[0093] Furthermore, to facilitate manufacturing, the baffle plate 14 and the valve body 1 are integrally formed, improving assembly efficiency. Optionally, the baffle plate 14 and the valve body 1 can be integrally formed by 3D printing or by molding.

[0094] In one embodiment of this application, as Figures 2 to 9 The second valve core 22 is a baffle plate, and the axial end face of the baffle plate is rotatably engaged with the axial end face of the baffle plate 14. It can be understood that the axial end face of the second valve core 22 is basically fitted with the axial end face of the baffle plate 14, so that there is no flow gap or a very small flow gap between the axial end face of the second valve core 22 and the axial end face of the baffle plate 14, so as to ensure the sealing effect of the second valve core 22 on the second water inlet 131.

[0095] Specifically, the second valve core 22 is provided with a flow port 22a. Optionally, the flow port 22a can be a through hole or notch on the second valve core 22. When the second valve core 22 rotates, it can drive the flow port 22a to move relative to the second water inlet 131 to adjust the overlap area between the flow port 22a and the second water inlet 131. It can be understood that when the second valve core 22 rotates and causes the flow port 22a to overlap with the second water inlet 131, the valve cavity 101 and the second water outlet channel 13 are in a conductive state. The conductive area between the valve cavity 101 and the second water outlet channel 13 is adjusted by adjusting the overlap area. When the disc of the second valve core 22 completely blocks the second water inlet 131, the second water outlet channel 13 and the valve cavity 101 are in a disconnected state.

[0096] Specifically, the baffle plate 14 is provided with a mounting hole 141, and the axial end face of the second valve core 22 is provided with a protruding shaft 221, which is rotatably installed in the mounting hole 141. It can be understood that the central axis of the protruding shaft 221 is aligned with the central axis of the valve cavity 101. During assembly, the mounting hole 141 and the protruding shaft 221 serve to position and install the valve core assembly 2.

[0097] In practical applications, the radial cross-sectional shape of the second valve core 22 can be determined according to the actual situation, such as being fan-shaped, square, circular, or other shapes. In this embodiment, the radial cross-section of the second valve core 22 is preferably fan-shaped, so that the outer peripheral surface of the second valve core 22 is an arc surface that matches the peripheral wall surface 101a of the valve cavity 101. Specifically, the outer peripheral surface of the second valve core 22 is basically tangent to the peripheral wall surface 101a of the valve cavity 101. Here, "basically tangent" or "tangential" means that the outer peripheral surface of the second valve core 22 is in contact or basically in contact with the peripheral wall surface 101a of the valve cavity 101, so that there is no flow gap or a very small flow gap between the outer peripheral surface of the second valve core 22 and the peripheral wall surface 101a of the valve cavity 101, thereby further improving the sealing effect of the second valve core 22 on the second water inlet 131.

[0098] Understandably, the central angle of the second valve core 22 should not be too small or too large. If it is too small, it may not completely block the second water inlet 131; if it is too large, the second valve core 22 may need to rotate a long angle before it can open the second water inlet 131, affecting the adjustment efficiency of the second water inlet 131, and may also result in both the first water inlet 121 and the second water inlet 131 being blocked. Based on this, in this embodiment, the central angle A2 of the second valve core 22 is set to satisfy 180°≤A2≤280°. On the one hand, this ensures that the second valve core 22 can completely block the second water inlet 131, and on the other hand, it ensures the adjustment efficiency of the second water inlet 131, preventing the situation where both the first water inlet 121 and the second water inlet 131 are blocked. In practical applications, to ensure better adjustment effect, the central angle of the second valve core 22 can be 180°≤A2≤240°.

[0099] Understandably, the connection structure 23 between the first valve core 21 and the second valve core 22 can be determined according to the actual situation.

[0100] In one embodiment, such as Figures 2 to 5 The connecting structure 23 includes multiple connecting rods 232 connecting the first valve core 21 and the second valve core 22, with the multiple connecting rods 232 spaced apart around the rotation center. This arrangement can prevent the rotating shaft 231 from stirring and causing turbulence in the valve cavity 101, thus reducing water flow resistance. In practical applications, the multiple connecting rods 232 are preferably used in structures where the first valve core 21 is a cylinder 212, with the multiple connecting rods 232 spaced apart around the periphery of the cylinder 212. In this case, the multiple connecting rods 232 are closer to the peripheral wall 101a of the valve cavity 101, which can further reduce disturbance to the water flow and reduce water flow resistance compared to the solution of setting the connecting rods 232 in the middle of the valve cavity 101.

[0101] To facilitate manufacturing, the first valve core 21, the second valve core 22, and the connecting structure 23 are integrally molded. Optionally, 3D printing or mold-based integral molding can be used to improve production efficiency.

[0102] In another embodiment, such as Figures 6 to 8 The connecting structure 23 is a rotating shaft 231 located at the center of rotation of the valve core assembly 2. This configuration can further improve the structural reliability of the valve core assembly 2 during rotation and ensure the rotational synchronization of the first valve core 21 and the second valve core 22.

[0103] In one embodiment of this application, as Figure 1 , Figure 2 , Figure 6 as well as Figure 10 The valve core assembly 2 also includes a drive shaft 24 connected to the first valve core 21. The valve device 100 also includes a drive assembly 3 installed on the valve body 1. The valve body 1 is also provided with an installation port 15 communicating with the valve cavity 101. The valve device 100 also includes a fixing sleeve 4 sealed and installed in the installation port 15. The fixing sleeve 4 is provided with an assembly hole 41. The drive shaft 24 of the valve core assembly 2 is sealed and fitted in the assembly hole 41 and extends out of the fixing sleeve 4 at one end away from the valve cavity 101. The drive assembly 3 is fixedly installed in the fixing sleeve 4 and drivenly connected to the drive shaft 24 to drive the valve core assembly 2 to rotate.

[0104] Specifically, the fixed sleeve 4 and the mounting port 15 can be sealed together using a sealing ring. The drive shaft 24 of the valve core assembly 2 passes through the mounting hole 41 from inside the valve cavity 101 and extends to the outside of the fixed sleeve 4. The drive shaft 24 and the mounting hole 41 can also be sealed together using a sealing ring. Optionally, the drive assembly 3 is a stepper motor, and the portion of the drive shaft 24 extending outside the fixed sleeve 4 can be a gear shaft for connection with the stepper motor. Optionally, the drive assembly 3 and the fixed sleeve 4 can be fixed together using screws.

[0105] Furthermore, such as Figure 10 The assembly hole 41 is provided with a first limiting part 411, and the drive shaft 24 is provided with a second limiting part 241. The second limiting part 241 is used to cooperate with the first limiting part 411 to limit the rotation angle of the drive shaft 24. This arrangement can prevent the drive shaft 24 from rotating too far and affecting the distribution of the water flow.

[0106] Optionally, the first limiting part 411 can be an arc-shaped rib provided on the wall of the assembly hole 41, so that the first limiting part 411 has two limiting surfaces along the circumferential direction. When the drive shaft 24 rotates in the assembly hole 41, the two limiting surfaces can respectively abut against the second limiting part 241 on the drive shaft 24 to limit the rotation angle of the drive shaft 24.

[0107] This utility model also proposes a gas water heater, such as Figure 2 andFigure 11 The gas water heater includes an inlet pipe 200, an outlet pipe 300, a heat exchanger 400, and a valve device 100. The specific structure of the valve device 100 is as described in the above embodiments. Since this gas water heater adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. Among them, the inlet channel 11 is connected to the inlet pipe 200, and one of the first outlet channel 12 and the second outlet channel 13 is connected to the inlet end of the heat exchanger 400, and the other is connected to the outlet pipe 300.

[0108] The following explanation is based on the example of the first water outlet channel 12 being connected to the inlet end of the heat exchanger 400, and the second water outlet channel 13 being connected to the outlet pipe 300:

[0109] Regarding the temperature rise during water outages, when the water heater is turned on again after being turned off, the valve core assembly 2 rotates. The first valve core 21 rotates to block the first water inlet 121, reducing the conduction area between the valve chamber 101 and the first water outlet channel 12. The second valve core 22 rotates to open the second water inlet 131, increasing the conduction area between the valve chamber 101 and the second water outlet channel 13. This allows more cold water to flow out from the second water outlet and into the water outlet pipe 300, thereby reducing the overall water outlet temperature, solving the problem of temperature rise during water outages, and preventing users from being scalded by hot water.

[0110] Regarding fluctuations during secondary startup, when the water heater is turned off and then turned on again, the valve core assembly 2 rotates, reducing the flow area of ​​the first water inlet 121 and increasing the flow area of ​​the second water inlet 131. This lowers the outlet water temperature to the required temperature, mitigating the issue of temperature rise during water outages. Then, after the device starts up, the valve core assembly 2 continues to rotate, increasing the flow area of ​​the first water inlet 121 and decreasing the flow area of ​​the second water inlet 131. This reduces the amount of cold water mixed into the outlet pipe 300, preventing excessive drops in the overall outlet water temperature. Therefore, the water temperature at the user's end is kept stable during secondary startup, avoiding sudden temperature changes.

[0111] Regarding water flow fluctuations, when the water flow suddenly increases, the water temperature will decrease. At this time, the valve core assembly 2 rotates, reducing the flow area of ​​the second water inlet 131 and decreasing the amount of cold water mixed into the outlet pipe 300, thus preventing the outlet water temperature from dropping too much. Conversely, when the water flow suddenly decreases, the water temperature will rise. At this time, the valve core assembly 2 rotates, increasing the flow area of ​​the second water inlet 131 and increasing the amount of cold water mixed into the outlet pipe 300, thus preventing the outlet water temperature from rising too much. This ensures a stable water temperature at the user's end when the water flow fluctuates.

[0112] Therefore, it can be seen that the gas water heater provided in this application can improve the fluctuation of water temperature and enhance the constant temperature performance.

[0113] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A valve device, characterized in that, include: The valve body is provided with a valve cavity and an inlet channel, a first outlet channel and a second outlet channel communicating with the valve cavity. The first outlet channel has a first water inlet communicating with the valve cavity, and the second outlet channel has a second water inlet communicating with the valve cavity. The first water inlet is located on the peripheral wall of the valve cavity. and A valve core assembly is rotatably disposed in the valve cavity; the valve core assembly includes a first valve core and a second valve core spaced axially apart, the first valve core being rotatably engaged with the peripheral wall of the valve cavity to block or open the first water inlet, thereby adjusting the conduction area between the valve cavity and the first water outlet channel, and the second valve core being used to block or open the second water inlet to adjust the conduction area between the valve cavity and the second water outlet channel.

2. The valve device as claimed in claim 1, characterized in that, When the conductive area between the valve cavity and the first water outlet channel increases, the conductive area between the valve cavity and the second water outlet channel decreases. When the conductive area between the valve cavity and the first water outlet channel decreases, the conductive area between the valve cavity and the second water outlet channel increases.

3. The valve device as claimed in claim 2, characterized in that, The outer peripheral surface of the first valve core rotates and engages with the peripheral wall of the valve cavity to block or open the first water inlet.

4. The valve device as claimed in claim 3, characterized in that, The first valve core is a cylinder; the end of the first valve core near the second valve core is open, and the end away from the second valve core is closed, and a flow cavity communicating with the valve cavity is formed inside the first valve core; The first valve core has a flow hole on its peripheral wall that connects to the flow cavity. When the first valve core rotates, it can drive the flow hole to move relative to the first water inlet, so as to adjust the overlap area between the flow hole and the first water inlet.

5. The valve device as claimed in claim 4, characterized in that, The flow passage extends circumferentially along the first valve core.

6. The valve device as claimed in claim 5, characterized in that, The flow passage has a first end and a second end along the circumferential direction, and the opening area at the first end is larger than the opening area at the second end. The opening area of ​​the flow passage gradually decreases from the first end to the second end.

7. The valve device as claimed in claim 4, characterized in that, The first valve core further includes a support rod and several reinforcing ribs. One end of the support rod is connected to the closed end of the first valve core, and the other end extends axially into the flow cavity. Several reinforcing ribs are distributed at intervals on the outer periphery of the support rod and are connected to the inner wall of the first valve core.

8. The valve device as claimed in claim 3, characterized in that, The first valve core is a stop block, and the outer peripheral surface of the first valve core is a circular arc surface or a spherical surface.

9. The valve device as claimed in claim 8, characterized in that, The outer circumferential surface of the first valve core is an arc surface; the central angle A1 corresponding to the outer circumferential surface of the first valve core satisfies: 80°≤A1≤180°.

10. The valve device according to any one of claims 1 to 9, characterized in that, The second water inlet extends axially along the valve cavity, and the second valve core rotates within the valve cavity to block or open the second water inlet.

11. The valve device as claimed in claim 10, characterized in that, The valve body is provided with a baffle plate, which is located at one axial end of the valve cavity to separate the second water outlet channel from the valve cavity; The periphery of the baffle plate is connected to the peripheral wall of the valve cavity, and the second water inlet is formed by an opening in the baffle plate; or, the baffle plate has a notch to enclose the second water inlet with the peripheral wall of the valve cavity. The axial end face of the second valve core rotates with the baffle plate to block or open the second water inlet.

12. The valve device as claimed in claim 11, characterized in that, The second valve core is a baffle. ， The axial end face of the second valve core is rotatably engaged with the axial end face of the baffle plate; The second valve core is provided with a flow port. When the second valve core rotates, it can drive the flow port to move relative to the second water inlet, so as to adjust the overlap area between the flow port and the second water inlet.

13. The valve device as claimed in claim 12, characterized in that, The outer circumferential surface of the second valve core is an arc surface, and the central angle A2 corresponding to the outer circumferential surface of the second valve core satisfies 180°≤A2≤280°.

14. The valve device as claimed in claim 11, characterized in that, The shield plate is provided with a mounting hole, and the axial end face of the second valve core is provided with a protruding shaft, which is rotatably fitted into the mounting hole.

15. The valve device as claimed in claim 11, characterized in that, The baffle plate and the valve body are integrally formed.

16. The valve device according to any one of claims 1 to 9, characterized in that, The valve core assembly also includes a connection structure that connects the first valve core and the second valve core; The connection structure is a rotating shaft located at the rotation center of the valve core assembly; or, the connection structure includes a plurality of connecting rods connecting the first valve core and the second valve core, with the plurality of connecting rods arranged at intervals around the rotation center.

17. The valve device as claimed in claim 16, characterized in that, The first valve core, the second valve core, and the connecting structure are integrally formed.

18. The valve device according to any one of claims 1 to 9, characterized in that, The valve body is further provided with an installation port communicating with the valve cavity, and the valve device further includes a fixing sleeve that is sealed and installed in the installation port, the fixing sleeve being provided with an assembly hole; The valve core assembly further includes a drive shaft connected to the first valve core, the drive shaft of the valve core assembly being sealed to the mounting hole and extending out of the fixing sleeve; The valve device further includes a drive assembly mounted on the fixed sleeve, the drive assembly being drivenly connected to the transmission shaft of the valve core assembly to drive the valve core assembly to rotate.

19. The valve device as claimed in claim 18, characterized in that, The assembly hole is provided with a first limiting part, and the drive shaft is provided with a second limiting part; the second limiting part is used to cooperate with the first limiting part to limit the rotation angle of the drive shaft.

20. A gas-fired water heater, characterized in that, It includes an inlet pipe, an outlet pipe, a heat exchanger, and a valve device as described in any one of claims 1 to 19, wherein the inlet channel is connected to the inlet pipe, and one of the first outlet channel and the second outlet channel is connected to the inlet end of the heat exchanger, and the other is connected to the outlet pipe.

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