Valve device and gas water heater

Abstract

The utility model discloses a valve device and gas water heater relates to water heater technical field. Valve device includes valve body, first barrier piece and valve core subassembly, and valve body is equipped with valve cavity and with valve cavity communication's water inlet flow channel, first water outlet flow channel and second water outlet flow channel, and first water outlet flow channel has with valve cavity communication's first water pass -through, and second water outlet flow channel has with valve cavity communication's second water pass -through, first barrier piece is fixed in the valve cavity, and first barrier piece is equipped with the water pass -through, and first water pass -through is communicated with valve cavity through the water pass -through, valve core subassembly includes the first valve core and second valve core of axial interval, and first valve core is rotated with first barrier piece cooperation to shield or open the water pass -through, is used for adjusting the conduction area of valve cavity and first water outlet flow channel, and second valve core rotates in the valve cavity to shield or open second water pass -through, is used for adjusting the conduction area of valve cavity and second water outlet flow channel. The utility model technical scheme can improve the water temperature fluctuation, and promote the 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 that aims to reduce the fluctuation range of the outlet water temperature of a gas water heater and improve its constant temperature performance.

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

[0006] 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.

[0007] A first blocking member is fixedly installed inside the valve cavity. The first blocking member has a water inlet, and the first water inlet communicates with the valve cavity through the water inlet; and

[0008] 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 rotatably cooperating with the first blocking member to block or open the water inlet, for adjusting the conduction area between the valve cavity and the first water outlet channel, and the second valve core rotating within the valve cavity to block or open the second water inlet, for adjusting the conduction area between the valve cavity and the second water outlet channel.

[0009] 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.

[0010] 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.

[0011] In one embodiment of this application, the first water inlet is disposed on the peripheral wall surface of the valve cavity; the first shielding member cooperates with the peripheral wall surface of the valve cavity, and the water outlet is aligned and connected with the first water inlet.

[0012] In one embodiment of this application, the first shielding member is a cylindrical body; the outer peripheral surface of the first shielding member is tightly fitted with the peripheral wall surface of the valve cavity, and the water inlet penetrates through the inner and outer peripheral surfaces of the first shielding member;

[0013] The first valve core is located inside the first shielding member, and the outer peripheral surface of the first valve core rotates with the inner peripheral surface of the first shielding member to block or open the water inlet.

[0014] In one embodiment of this application, the water outlet extends circumferentially along the first shielding member;

[0015] The first valve core is a stop block.

[0016] In one embodiment of this application, the outer peripheral surface of the stop is an arc surface, and the central angle A1 corresponding to the outer peripheral surface of the stop satisfies: 80°≤A1≤180°.

[0017] In one embodiment of this application, the valve body is provided with a second shielding member that separates the second water outlet channel from the valve cavity, and the second shielding member is provided with the second water inlet;

[0018] The second valve core rotates in conjunction with the second shielding member to block or open the second water inlet.

[0019] In one embodiment of this application, the second shielding member is a shielding plate; the shielding plate is located at one axial end of the valve cavity, the second water inlet extends along the axial direction of the valve cavity, and the axial end face of the second valve core is rotatably engaged with the second shielding member.

[0020] In one embodiment of this application, 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;

[0021] Alternatively, the baffle plate may have a notch to enclose the peripheral wall of the valve cavity to form the second water inlet.

[0022] 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.

[0023] In one embodiment of this application, the valve core assembly further includes a rotating shaft connecting the first valve core and the second valve core, wherein the first valve core and the second valve core are respectively located on radial sides of the rotating shaft.

[0024] In one embodiment of this application, the valve body is further provided with an installation port communicating with the valve cavity;

[0025] The valve device further includes a fixing sleeve and a drive assembly installed on the fixing sleeve. The fixing sleeve is sealed and installed at the mounting port, and the fixing sleeve is provided with an assembly hole.

[0026] The end of the rotating shaft opposite to the second valve core is sealed and fitted into the mounting hole, and extends out of the mounting hole to be driven and connected to the drive assembly.

[0027] In one embodiment of this application, the first shielding member is fixedly connected to the fixed sleeve.

[0028] In one embodiment of this application, the first shielding member and the fixing sleeve are integrally formed.

[0029] In one embodiment of this application, the assembly hole is provided with a first limiting part, and the rotating shaft is provided with a second limiting part; the second limiting part is used to limit the rotation angle of the rotating shaft by engaging with the first limiting part.

[0030] 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.

[0031] In the valve device of this utility model, 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, and the second outlet channel has a second water inlet. A first blocking member is fixedly provided in the valve cavity, and the first blocking member has a water passage. The first water inlet communicates with the valve cavity through the water passage, and the second outlet channel communicates with the valve cavity through the second water inlet. A rotatable valve core assembly is provided in the valve cavity. The valve core assembly has a first valve core and a second valve core that are axially spaced apart. The first valve core rotates and engages with the first blocking component to block or open the water inlet, adjusting the conduction area between the valve chamber and the first water outlet channel. The second valve core rotates to block or open the second water inlet, adjusting the conduction area between the valve chamber and the second water outlet channel, thereby realizing the water distribution function of the first and second water outlet channels. When the valve device of this embodiment is applied to a gas water heater, it can adjust the water flow of the first and second water outlet channels according to different operating conditions of the gas water heater, which can improve the fluctuation of water temperature and enhance the constant temperature performance.

[0032] In addition, this embodiment sets up an independent first shielding component, and sets a water outlet on the first shielding component, which is independent of the valve body, to cooperate with the first valve core to discharge water. On the one hand, it can reduce the manufacturing difficulty of the valve body structure, and on the other hand, it can simplify the structural design of the first valve core, thereby improving the overall production efficiency of the valve device. Attached Figure Description

[0033] 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.

[0034] Figure 1 This is a schematic diagram of the structure of an embodiment of the valve device of this utility model;

[0035] Figure 2 This is an exploded view of an embodiment of the valve device of this utility model;

[0036] Figure 3 This is a cross-sectional view of an embodiment of the valve device of this utility model;

[0037] Figure 4 This is a schematic diagram of the cooperative structure of the valve core assembly, the first shielding member, and the fixing sleeve in the valve device of this utility model;

[0038] Figure 5 This is a schematic diagram of the structure of one embodiment of the valve core assembly in this utility model;

[0039] Figure 6 for Figure 5 Another perspective on the embodiments;

[0040] Figure 7 This is a schematic diagram of the structure of the first shielding member and the fixing sleeve in the embodiment of this utility model;

[0041] Figure 8 This is an assembly diagram of the valve body, valve core assembly, and fixing sleeve in an embodiment of this utility model;

[0042] Figure 9 This is a schematic diagram of the valve body from another perspective in an embodiment of this utility model;

[0043] Figure 10 This is a schematic diagram of an embodiment of the gas water heater of this utility model.

[0044] Explanation of icon numbers:

[0045]

[0046]

[0047] 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

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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 technical features indicated. Therefore, a feature 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. When 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.

[0052] 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 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.

[0053] Based on this, this application proposes a valve device 100 for use in a gas water heater, such as... Figure 10The 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.

[0054] like Figures 1 to 3 As shown, the valve device 100 includes a valve body 1, a first blocking member 5, and a valve core assembly 2. The valve body 1 has 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 blocking member 5 is fixedly installed inside the valve cavity 101 and has a water passage 501. The first water inlet 121 communicates with the valve cavity 101 through the water passage 501. 01 Connected; Valve core assembly 2 is rotatably disposed in valve cavity 101; Valve core assembly 2 includes a first valve core 21 and a second valve core 22 spaced axially apart. The first valve core 21 is rotatably engaged with the first blocking member 5 to block or open the water outlet 501, which is used to adjust the conduction area between valve cavity 101 and the first water outlet channel 12. The second valve core 22 rotates in valve cavity 101 to block or open the second water outlet 131, which is used to adjust the conduction area between valve cavity 101 and the second water outlet channel 13.

[0055] 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, a first blocking member 5 is fixedly provided in the valve cavity 101. The first blocking member 5 is provided with a water inlet 501. The first outlet channel 12 has a first water outlet 121, which is connected to the valve cavity 101 through the water inlet 501. The second outlet channel 13 is connected to the valve cavity 101 through the second water outlet 131. Therefore, the flow rate of the water inlet 501 and the second water outlet 131 can be adjusted by the valve core assembly 2 provided in the valve cavity 101, 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.

[0056] 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.

[0057] 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 3 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.

[0058] 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 can rotate relative to the first blocking member 5 to adjust the opening of the water inlet 501 to adjust the flow rate of the first water outlet 12. The second valve core 22 is used to adjust the opening of the second water outlet 131 to adjust the flow rate of the second water outlet 13. It can be understood that this valve device 100 realizes 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 set as a cylindrical cavity. The valve core assembly 2 rotates 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.

[0059] It should be noted that in this embodiment, a first blocking member 5 with a water outlet 501 is provided in the valve cavity 101. The water flow rate is adjusted by the rotational cooperation between the first valve core 21 and the first blocking member 5. In other words, in this embodiment, the opening degree of the water outlet 501 can be adjusted simply by rotating the first valve core 21 to block or open the water outlet 501. Compared to the related technologies where a notch is provided on the first valve core 21 and the opening of the notch is adjusted by rotating the first valve core 21, this embodiment does not require specific limitations on the structure of the first valve core 21 itself. Compared to the related technologies where the first valve core 21 is directly engaged with the valve body 1 to adjust the opening of the first water inlet 121, this embodiment does not require limitations on the shape and structure of the first water inlet 121 at the junction of the first water outlet channel 12 and the valve cavity 101. By providing the water inlet 501 on the first shielding member 5 independent of the valve body 1, the manufacturing difficulty of the valve body 1 structure can be reduced, and the structural design of the first valve core 21 can be simplified, thereby improving the overall production efficiency of the valve device 100.

[0060] It should be noted that in practical applications, the first blocking member 5 can be set only at the position of the first water inlet 121, or the blocking members can be set at the positions of both the second water inlet 131 and the first water inlet 121. When the blocking members are set at the positions of both water inlets, the first valve core 21 and the second valve core 22 cooperate with the corresponding blocking members.

[0061] Understandably, the specific structure of the first shielding component 5 can be determined according to the actual situation, such as a plate-shaped structure, a block-shaped structure, a cylindrical structure, or some other structure. Understandably, the first shielding component 5 can be an integral structure with the valve body 1 or a separate structure.

[0062] 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 water outlet 501 can also 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.

[0063] In practical applications, the valve device 100 also includes a flow sensor, which is located in the water inlet channel 11.

[0064] When this valve device 100 is applied to a gas 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:

[0065] Regarding the temperature rise during water outages, when the water heater is turned off and then turned on again, the valve core assembly 2 rotates. The first valve core 21 rotates to reduce or close the opening of the water inlet 501, while the second valve core 22 rotates to increase the opening of the second water outlet 131. This allows more cold water to flow out from the second outlet and into the outlet pipe 300, thereby reducing the overall water temperature and resolving the temperature rise issue during water outages, preventing users from being scalded by hot water.

[0066] 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 opening of the inlet 501 and increasing the opening of the second inlet 131, thus lowering the outlet water temperature to the required temperature and 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 opening of the inlet 501 and decreasing the opening of the second inlet 131, reducing the amount of cold water mixed into the outlet pipe 300 and preventing excessive drop in the overall outlet water temperature. This ensures stable water temperature at the user's end during secondary startup, avoiding sudden temperature changes.

[0067] 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 opening of the second water inlet 131 and decreasing the amount of cold water mixed into the outlet pipe 300, 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 opening of the second water inlet 131 and increasing the amount of cold water mixed into the outlet pipe 300, 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.

[0068] 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 has a first water inlet 121, and the second outlet channel 13 has a second water inlet 131. A first blocking member 5 is fixedly provided in the valve cavity 101, and the first blocking member 5 has a water outlet 501. The first water inlet 121 communicates with the valve cavity 101 through the water outlet 501, and the second outlet channel 13 communicates with the valve cavity 101 through the second water inlet 131. A rotatable valve core assembly 2 is provided in the valve cavity 101, and the valve core assembly 2 has an axial spacing. The first valve core 21 and the second valve core 22 are separated. The first valve core 21 rotates with the first blocking member 5 to block or open the water outlet 501, adjusting the conduction area between the valve cavity 101 and the first water outlet channel 12. The second valve core 22 rotates to block or open the second water outlet 131, adjusting 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 output 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.

[0069] In addition, this embodiment sets up an independent first shielding member 5, and sets a water outlet 501 on the first shielding member 5, which is independent of the valve body 1, to cooperate with the first valve core 21 to discharge water. On the one hand, it can reduce the manufacturing difficulty of the valve body 1 structure, and on the other hand, it can simplify the structural design of the first valve core 21, thereby improving the overall production efficiency of the valve device 100.

[0070] In one embodiment of this application, as Figure 2 and Figure 3 When the conductive area between valve cavity 101 and the first water outlet channel 12 increases, the conductive area between valve cavity 101 and the second water outlet channel 13 decreases; when the conductive area between valve cavity 101 and the first water outlet channel 12 decreases, the conductive area between valve cavity 101 and the second water outlet channel 13 increases.

[0071] 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. When the water inlet 501 is blocked, the second water outlet 131 is fully open; when the second water outlet 131 is blocked, the water inlet 501 is fully open.

[0072] 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.

[0073] In practical applications, the inverse correlation between the two conduction areas can be achieved by setting the positions of the water inlet 501 and the second water outlet 131, as well as the positions of the first valve core 21 and the second valve core 22. For example, when the water inlet 501 and the second water outlet 131 are both opened radially along the valve cavity 101: the water inlet 501 and the second water outlet 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 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 water inlet 501 and the second water outlet 131 are inversely related; or, the water inlet 501 and the second water outlet 131 are located on opposite sides 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 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 water inlet 501 and the second water outlet 131 are inversely related. For example, when the water inlet 501 is radially opened along the valve cavity 101 and the second water outlet 131 is axially arranged along the valve cavity 101: the water inlet 501 and the second water outlet 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 water inlet 501 and the second water outlet 131 are inversely related; or, the water inlet 501 and the second water outlet 131 are located on both sides 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 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 water inlet 501 and the second water outlet 131 are inversely related.

[0074] In one embodiment of this application, as Figure 2 and Figure 3 The first water inlet 121 is located on the peripheral wall surface 101a of the valve cavity 101; the first shielding member 5 cooperates with the peripheral wall surface 101a of the valve cavity 101, and the water outlet 501 is aligned and connected with the first water inlet 121.

[0075] In this embodiment, the first water inlet 121 is located on the peripheral wall surface 101a of the valve cavity 101. By engaging the first blocking member 5 with the peripheral wall surface 101a of the valve cavity 101, the water outlet 501 is aligned and connected with the first water inlet 121. When the first valve core 21 rotates relative to the first blocking member 5, the outer peripheral surface of the first valve core 21 can block or open the water outlet 501, thereby adjusting the opening degree of the water outlet 501. It can be understood that the water outlet 501 is for radial water flow, which can reduce the generation of eddies in the valve cavity 101 and reduce resistance.

[0076] In practical applications, the first shielding member 5 can be an arc structure or a cylindrical structure that mates with the peripheral wall 101a of the valve cavity 101.

[0077] As an example, such as Figures 2 to 4 The first shielding member 5 is a cylindrical body; the outer peripheral surface of the first shielding member 5 is tightly fitted with the peripheral wall surface 101a of the valve cavity 101, and the water inlet 501 penetrates the inner and outer peripheral surfaces of the first shielding member 5; the first valve core 21 is located inside the first shielding member 5, and the outer peripheral surface of the first valve core 21 is rotatably engaged with the inner peripheral surface of the first shielding member 5 to block or open the water inlet 501.

[0078] By setting the first shielding member 5 as a cylindrical structure, the outer peripheral surface of the first shielding member 5 is tightly fitted with the peripheral wall surface 101a of the valve cavity 101, which can prevent water from leaking out between the first shielding member 5 and the peripheral wall surface 101a of the valve cavity 101, thus ensuring the accuracy of flow control. The water inlet 501 penetrates the inner and outer peripheral surfaces of the first shielding member 5. At this time, the inner cavity of the first shielding member 5 is connected to the valve cavity 101, and the water inlet 501 is a radial water passage. By placing the first valve core 21 inside the first shielding member 5, the first valve core 21 is located on the upstream side of the water inlet 501. Thus, when the first valve core 21 rotates to block the water inlet 501, the water pressure can be used to increase the blocking force of the first valve core 21 on the water inlet 501.

[0079] Furthermore, such as Figures 2 to 4 The water outlet 501 is provided to extend circumferentially along the first shield 5.

[0080] Understandably, the first valve core 21 rotates within the first shielding member 5. In this embodiment, by extending the water outlet 501 along the circumference of the first shielding member 5, the outer circumferential surface of the first valve core 21 can move along the extension direction of the water outlet 501 when the first valve core 21 rotates, thereby adjusting the opening of the water outlet 501. This design is more conducive to the linear adjustment of the opening of the water outlet 501 by the first valve core 21, making it easier to control the water flow.

[0081] Optionally, the water inlet 501 can extend along the same opening width dimension. In this embodiment, the water inlet 501 increases or decreases in a consistent manner when the first valve core 21 rotates by a unit angle, thereby allowing for linear adjustment of the flow rate.

[0082] Alternatively, in some other embodiments, the opening width of the water inlet 501 can vary gradually. This design can improve the accuracy of the water inlet 501 opening adjustment process and achieve a wider adjustment range.

[0083] Furthermore, such as Figures 2 to 6The first valve core 21 is a stop block 211. The outer peripheral surface of the stop block 211 is rotatably engaged with the inner peripheral surface of the first blocking member 5 to block or open the water outlet 501; the outer peripheral surface of the stop block 211 is an arc surface or a spherical surface.

[0084] Understandably, the first valve core 21 can be an arc-shaped block, a spherical block, a butterfly-shaped block, or some other shape or structure.

[0085] 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 inner peripheral surface of the first blocking member 5, ensuring better sealing force and reducing resistance. Optionally, the radial cross-section of the first valve core 21 is fan-shaped.

[0086] 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 seal the water outlet 501, affecting the flow rate regulation of 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 water outlet 501, affecting the regulation efficiency of the water outlet 501. 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 seal the water outlet 501; on the other hand, it ensures the regulation efficiency of the water outlet 501 and prevents the situation where the first valve core 21 rotates for too long without being able to open the water outlet 501. 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°.

[0087] 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.

[0088] In one embodiment of this application, as Figure 3 and Figure 9 The valve body 1 is provided with a second shielding member 14 that separates the second water outlet channel 13 from the valve cavity 101. The second shielding member 14 is provided with a second water inlet 131. The second valve core 22 is rotatably engaged with the second shielding member 14 to block or open the second water inlet 131.

[0089] In this embodiment, a second shielding member 14 is provided inside the valve body 1, and a second water inlet 131 is provided on the second shielding member 14. The second valve core 22 adjusts the opening degree of the second water inlet 131 by rotating with the second shielding member 14.

[0090] Understandably, the specific structure of the second shielding member 14 can be determined according to the actual situation. For example, it can be a plate-shaped structure, a block-shaped structure, a cylindrical structure, or some other structures.

[0091] In practical applications, the second shielding member 14 can be an integral or separate structure from the valve body 1. In this embodiment, considering assembly efficiency, it is preferable that the second shielding member 14 is integrally formed with the valve body 1 for ease of manufacturing. It is understood that the method of integral forming of the second shielding member 14 with the valve body 1 can also be determined according to the actual situation. For example, when the valve body 1 is a metal part, the second shielding member 14 and the valve body 1 can be integrally formed by casting; when the valve body 1 is a plastic part, the second shielding member 14 and the valve body 1 can be integrally formed by molding or 3D printing.

[0092] Specifically, such as Figure 3 and Figure 9 The second shielding member 14 is a shielding plate; the second shielding member 14 is located at one axial end of the valve cavity 101, the second water inlet 131 extends along the axial direction of the valve cavity 101, and the axial end face of the second valve core 22 is rotatably engaged with the second shielding member 14. It can be understood that the axial end face of the second valve core 22 and the axial end face of the second shielding member 14 are basically fitted together, so that there is no or very little flow gap between the axial end face of the second valve core 22 and the axial end face of the second shielding member 14, to ensure the sealing effect of the second valve core 22 on the second water inlet 131.

[0093] In this embodiment, the second shielding member 14 is set as a shielding plate. Compared with other structures such as cylindrical or block structures, the shielding plate has a simpler structural shape and is easier to integrally mold inside the valve body 1, with a lower molding process difficulty. The shielding plate separates the second water outlet channel 13 from the valve cavity 101. The second water inlet 131 is formed between the shielding plate and the inner wall of the valve body 1, so that when the second valve core 22 rotates in the valve cavity 101, it can rotate relative to the shielding plate to block or open the second water inlet 131, thereby regulating the flow rate at the second water inlet 131.

[0094] The baffle plate is located at one axial end of the valve cavity 101, and the second water inlet 131 axially penetrates the baffle plate. The second water inlet 131 is located on the baffle plate or between the baffle plate and the peripheral wall surface 101a of the valve cavity 101.

[0095] Optionally, when the periphery of the baffle plate 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. 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.

[0096] Optionally, the side of the baffle plate is provided with a notch, which is used to form a second water inlet 131 by surrounding the peripheral wall 101a of the valve cavity 101. This design makes it easier to mold and manufacture.

[0097] Understandably, the shape of the second water inlet 131 can be, for example, circular, fan-shaped, square, strip-shaped, or other shapes. The radial cross-sectional shape of the second valve core 22 can also be determined according to the actual situation, for example, it can be fan-shaped, square, circular, or other shapes. Considering that the second valve core 22 rotates within the valve cavity 101, in order to better block and allow water to pass through, in this embodiment, the second water inlet 131 is set as a fan-shaped hole with the central axis of the valve cavity 101 as the center. Correspondingly, the radial cross-section of the second valve core 22 is fan-shaped, so the outer peripheral surface of the second valve core 22 is an arc surface adapted to 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" 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. The central angle of the second valve core 22 is larger than the central angle of the second water inlet 131. This setting allows the second valve core 22 to completely seal the second water inlet 131 during rotation, while the second valve core 22 can adjust the opening size of the second water inlet 131.

[0098] Understandable, such as Figure 6 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. Therefore, in this embodiment, the central angle A2 of the second valve core 22 is set to satisfy 180°≤A2≤280°. This ensures that the second valve core 22 can completely block the second water inlet 131 while maintaining the adjustment efficiency of the second water inlet 131 and preventing both the first water inlet 121 and the second water inlet 131 from being blocked. In practical applications, to ensure better adjustment results, the central angle A2 of the second valve core 22 can be 180°≤A2≤240°.

[0099] Furthermore, 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. 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.

[0100] Specifically, the baffle plate 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.

[0101] In one embodiment of this application, as Figures 2 to 6 The valve core assembly 2 also includes a rotating shaft 23 connecting the first valve core 21 and the second valve core 22, with the first valve core 21 and the second valve core 22 located on the radial sides of the rotating shaft 23 respectively.

[0102] In this embodiment, by connecting both the first valve core 21 and the second valve core 22 to the rotating shaft 23, the rotation of the rotating shaft 23 can drive the first valve core 21 and the second valve core 22 to rotate simultaneously. Therefore, flow rate regulation of the first outlet channel 12 and the second outlet channel 13 can be achieved simply by driving the rotating shaft 23 to rotate. Optionally, the rotation axis of the rotating shaft 23 is aligned with the central axis of the valve cavity 101, and the first valve core 21 and the second valve core 22 rotate around the central axis of the valve cavity 101. Connecting the first valve core 21 and the second valve core 22 via the rotating shaft 23 further improves the structural reliability of the valve core assembly 2 during rotation and ensures the synchronous rotation of the first valve core 21 and the second valve core 22.

[0103] Furthermore, the first valve core 21 and the second valve core 22 are located on the radial sides of the rotating shaft 23, respectively. This arrangement makes the rotational movement of the entire valve core assembly 2 more stable and prevents the two valve cores from being misaligned when they are both located on the same side of the rotating shaft 23. On the other hand, it can smoothly achieve the inverse correlation between the opening degree of the water inlet 501 and the opening degree of the second water outlet 131.

[0104] In one embodiment of this application, as Figures 2 to 4 as well as Figure 8The valve body 1 is also provided with an installation port 15 communicating with the valve cavity 101; the valve device 100 also includes a fixed sleeve 4 and a drive assembly 3 installed on the fixed sleeve 4. The fixed sleeve 4 is sealed and installed on the installation port 15, and the fixed sleeve 4 is provided with an assembly hole 41; the end of the rotating shaft 23 away from the second valve core 22 is sealed and fitted with the assembly hole 41, and extends out of the assembly hole 41 to drive and connect with the drive assembly 3.

[0105] Specifically, the fixing sleeve 4 and the mounting port 15 can be sealed together using a sealing ring. The rotating shaft 23 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 fixing sleeve 4. The rotating shaft 23 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 rotating shaft 23 extending outside the fixing sleeve 4 can be a gear shaft for connection with the stepper motor. Optionally, the drive assembly 3 and the fixing sleeve 4 can be fixed together using screws.

[0106] Optionally, the mounting port 15 and the second shielding member 14 can be respectively set at both ends of the valve cavity 101. The mounting port 15 is coaxial with the valve cavity 101, and the mounting hole 141 on the second shielding member 14 is coaxial with the valve cavity 101. Thus, during assembly, the valve core assembly 2 can be inserted from the mounting port 15 along the axial direction of the valve cavity 101, so that the protruding shaft 221 of the second valve core 22 can be assembled into the mounting hole 141 of the second shielding member 14. This design eliminates the need for installation operations in multiple directions for the valve core assembly 2, further simplifying the installation operation and improving installation convenience.

[0107] Furthermore, such as Figures 2 to 4 as well as Figure 7 The first blocking component 5 is fixedly connected to the fixing sleeve 4. With this configuration, during assembly, the first blocking component 5 can be installed on the outside of the valve body 1 and the fixing sleeve 4 first, and then the fixing sleeve 4 can be installed into the mounting port 15 of the valve body 1. At the same time, the first blocking component 5 can be installed into the valve cavity 101. That is, during the installation process into the valve body 1, the operator only needs to take the fixing sleeve 4 for assembly operations, without having to manually limit the first blocking component 5, thereby reducing the installation difficulty and improving the assembly efficiency.

[0108] To further improve assembly convenience, in one embodiment, the first shielding member 5 and the fixing sleeve 4 are integrally formed. This arrangement allows the first shielding member 5 and the fixing sleeve 4 to be manufactured simultaneously, eliminating the need for separate assembly steps and further improving assembly efficiency.

[0109] As an example, during assembly, the rotating shaft 23 of the valve core assembly 2 can be installed into the assembly hole 41 of the fixed sleeve 4 first, so that the first valve core 21 is aligned with the water outlet 501 on the first shield 5. At this time, the valve core assembly 2, the first shield 5 and the fixed sleeve 4 are assembled into a whole component. Then, this whole component is inserted into the valve cavity 101 through the mounting port 15, so that the protruding shaft 221 of the second valve core 22 is installed into the mounting hole 141 on the shield plate. At the same time, the first shield 5 is assembled with the inner peripheral wall of the valve cavity 101, and the fixed sleeve 4 is sealed and assembled with the mounting port 15. Then, the drive assembly 3 is installed on the fixed sleeve 4, so that the drive assembly 3 is driven and connected to the rotating shaft 23, thereby realizing the assembly of the valve body 1, the valve core assembly 2, the first shield 5, the fixed sleeve 4 and the drive assembly 3.

[0110] Furthermore, such as Figure 7 and Figure 8 The assembly hole 41 is provided with a first limiting part 411, and the rotating shaft 23 is provided with a second limiting part 231. The second limiting part 231 is used to cooperate with the first limiting part 411 to limit the rotation angle of the rotating shaft 23. This arrangement can prevent the rotating shaft 23 from rotating too far and affecting the distribution of the water flow.

[0111] 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 rotating shaft 23 rotates in the assembly hole 41, the two limiting surfaces can respectively abut against the second limiting part 231 on the rotating shaft 23 to limit the rotation angle of the rotating shaft 23.

[0112] This utility model also proposes a gas water heater, such as Figure 10 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.

[0113] 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:

[0114] Regarding the temperature rise during water outages, when the water heater is turned off and then turned on again, the valve core assembly 2 rotates. The first valve core 21 rotates to reduce or close the opening of the water inlet 501, while the second valve core 22 rotates to increase the opening of the second water outlet 131. This allows more cold water to flow out from the second outlet and into the outlet pipe 300, thereby reducing the overall water temperature and resolving the temperature rise issue during water outages, preventing users from being scalded by hot water.

[0115] 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 opening of the inlet 501 and increasing the opening of the second inlet 131, thus lowering the outlet water temperature to the required temperature and 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 opening of the inlet 501 and decreasing the opening of the second inlet 131, reducing the amount of cold water mixed into the outlet pipe 300 and preventing excessive drop in the overall outlet water temperature. This ensures stable water temperature at the user's end during secondary startup, avoiding sudden temperature changes.

[0116] 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 opening of the second water inlet 131 and decreasing the amount of cold water mixed into the outlet pipe 300, 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 opening of the second water inlet 131 and increasing the amount of cold water mixed into the outlet pipe 300, 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.

[0117] 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.

[0118] 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. A first blocking member is fixedly installed inside the valve cavity. The first blocking member has a water inlet, and the first water inlet communicates with the valve cavity through the water inlet; 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 rotatably cooperating with the first blocking member to block or open the water inlet, for adjusting the conduction area between the valve cavity and the first water outlet channel, and the second valve core rotating within the valve cavity to block or open the second water inlet, for adjusting 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 first water inlet is located on the peripheral wall of the valve cavity; the first shielding member cooperates with the peripheral wall of the valve cavity, and the water outlet is aligned and connected with the first water inlet.

4. The valve device as claimed in claim 3, characterized in that, The first shielding member is a cylindrical body; the outer peripheral surface of the first shielding member is tightly fitted with the peripheral wall surface of the valve cavity, and the water inlet penetrates through the inner and outer peripheral surfaces of the first shielding member; The first valve core is located inside the first shielding member and rotates with the inner circumferential surface of the first shielding member to block or open the water inlet.

5. The valve device as claimed in claim 4, characterized in that, The water outlet extends circumferentially along the first shielding member; The first valve core is a stop block.

6. The valve device as claimed in claim 5, characterized in that, The outer circumferential surface of the stop block is an arc surface, and the central angle A1 corresponding to the outer circumferential surface of the stop block satisfies: 80°≤A1≤180°.

7. The valve device according to any one of claims 1 to 6, characterized in that, The valve body is provided with a second shielding member that separates the second water outlet channel from the valve cavity, and the second shielding member is provided with the second water inlet; The second valve core rotates in conjunction with the second shielding member to block or open the second water inlet.

8. The valve device as claimed in claim 7, characterized in that, The second shielding member is a shielding plate; the shielding plate is located at one axial end of the valve cavity, the second water inlet extends along the axial direction of the valve cavity, and the axial end face of the second valve core is rotatably engaged with the second shielding member.

9. The valve device as claimed in claim 8, characterized in that, 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; Alternatively, the baffle plate may have a notch to enclose the peripheral wall of the valve cavity to form the second water inlet.

10. The valve device as claimed in claim 8, characterized in that, 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.

11. The valve device according to any one of claims 1 to 6, characterized in that, The valve core assembly further includes a rotating shaft connecting the first valve core and the second valve core, with the first valve core and the second valve core located on opposite radial sides of the rotating shaft.

12. The valve device as claimed in claim 11, characterized in that, The valve body is also provided with an installation port that communicates with the valve cavity; The valve device further includes a fixing sleeve and a drive assembly installed on the fixing sleeve. The fixing sleeve is sealed and installed at the mounting port, and the fixing sleeve is provided with an assembly hole. The end of the rotating shaft opposite to the second valve core is sealed and fitted into the mounting hole, and extends out of the mounting hole to be driven and connected to the drive assembly.

13. The valve device as claimed in claim 12, characterized in that, The first shielding member is fixedly connected to the fixed sleeve.

14. The valve device as claimed in claim 13, characterized in that, The first shielding member and the fixing sleeve are integrally formed.

15. The valve device as claimed in claim 12, characterized in that, The assembly hole is provided with a first limiting part, and the rotating 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 rotating shaft.

16. 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 15, 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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