Valve device and gas water heater

Abstract

The utility model discloses a valve device and gas water heater, wherein, the valve device includes valve body, shelter piece and valve core subassembly, and the valve body is equipped with the valve cavity and with the water inlet channel, first water outlet channel and second water outlet channel of valve cavity communication, and the first water outlet channel is communicated with the valve cavity through the first water pass-through, and the shelter piece is integrally formed in the valve body, and the shelter piece is equipped with the second water pass-through that communicates second water outlet channel and valve cavity, and the valve core subassembly rotatably is located in the valve cavity, and the valve core subassembly includes the first valve core and the second valve core of axial interval, and the first valve core rotates in the valve cavity to shelter or open the first water pass-through, is used for adjusting the conduction area of valve cavity and first water outlet channel, and the second valve core is rotated with shelter piece cooperation, to shelter or open the second water pass-through, is used for adjusting the conduction area of valve cavity and second water outlet channel. The utility model technical scheme can improve the water temperature fluctuation, promote the constant temperature performance, can reduce the assembly difficulty of valve device simultaneously, promotes the production efficiency.

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. However, gas water heaters can experience significant temperature fluctuations when the water volume fluctuates, such as sudden changes in water temperature, and the water temperature fluctuating considerably when the water is turned off and then on again, resulting in the water being hot initially and then cold later.

[0003] In related technologies, valve devices are installed in hot water systems to solve the problem of large fluctuations in outlet water temperature. However, the valve body and valve core of the valve devices in these technologies are difficult to assemble. Utility Model Content

[0004] The main purpose of this utility model is to propose a valve device that aims to reduce the assembly difficulty of the valve device and improve production efficiency.

[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 is connected to the valve cavity through a first water inlet.

[0007] A shielding component, integrally formed within the valve body, is provided with a second water inlet connecting the second water outlet channel and the valve cavity; 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 rotating within the valve cavity to block or open the first water inlet, for adjusting the conduction area between the valve cavity and the first water outlet channel, and the second valve core rotating in cooperation with the blocking member 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, the shielding member is disposed at one axial end of the valve cavity to separate the second water outlet channel from the valve cavity;

[0010] The axial end face of the second valve core rotates with the shielding member to block or open the second water inlet.

[0011] In one embodiment of this application, the shielding member is a plate, and the second water inlet passes through the shielding member along the axial direction of the valve cavity;

[0012] The axial end face of the second valve core is substantially fitted to the axial end face of the shielding member.

[0013] In one embodiment of this application, the second valve core is a baffle; the second valve core is provided with a flow port communicating with the valve cavity, 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.

[0014] In one embodiment of this application, the second water inlet is a fan-shaped hole with the central axis of the valve cavity as its center;

[0015] The radial cross-section of the second valve core is fan-shaped, and the central angle of the second valve core is larger than the central angle of the second water inlet.

[0016] In one embodiment of this application, the central angle A3 of the second water inlet satisfies: 80°≤A3≤180°.

[0017] In one embodiment of this application, the periphery of the shielding member is connected to the peripheral wall of the valve cavity, and the second water inlet is formed by an opening in the shielding member;

[0018] Alternatively, the shielding member may have a notch to enclose the peripheral wall of the valve cavity to form the second water inlet.

[0019] In one embodiment of this application, the valve body has a mounting port at one end of the valve cavity that is axially opposite to the shielding member, and the mounting port is coaxially arranged with the valve cavity;

[0020] The valve core assembly is axially inserted into the valve cavity via the mounting port, and the axial end face of the second valve core is rotatably engaged with the shielding member.

[0021] In one embodiment of this application, the shielding member is provided with a mounting hole, and the mounting hole is coaxially arranged with the valve cavity;

[0022] The second valve core has a protruding shaft on its axial end face away from the first valve core. When the valve core assembly is inserted into the valve cavity through the mounting port, the protruding shaft rotates and engages with the mounting hole.

[0023] In one embodiment of this application, the valve device further includes a fixing sleeve sealed and installed in the mounting port and a drive assembly installed in the fixing sleeve, wherein the fixing sleeve is provided with an assembly hole;

[0024] 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 to drive the drive assembly.

[0025] 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;

[0026] 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.

[0027] In one embodiment of this application, the first water inlet is disposed on the peripheral wall surface of the valve cavity, and the outer peripheral surface of the first valve core is rotatably engaged with the peripheral wall surface of the valve cavity;

[0028] The first valve core has a cylindrical structure; 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; a flow hole communicating with the flow cavity is opened on the peripheral wall of the first valve core, and 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; or, 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.

[0029] 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.

[0030] In this utility model's valve device, 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 communicates with the valve cavity through a first water inlet, and the second outlet channel communicates with the valve cavity through a second water inlet. A rotatable valve core assembly is provided inside the valve cavity. The valve core assembly has a first valve core and a second valve core spaced axially apart. The first valve core and the second valve core respectively adjust the opening degree of the first water inlet and the second water inlet, thereby realizing the water volume distribution function of the first outlet channel and the second outlet channel. When the valve device of this embodiment is applied to a gas water heater, it can adjust the water volume of the first outlet channel and the second outlet channel according to different operating conditions of the gas water heater, which can improve water temperature fluctuation and enhance constant temperature performance.

[0031] Furthermore, by setting the shielding component that cooperates with the second valve core to be integrally formed with the valve body, this embodiment eliminates the assembly steps of the shielding component and the valve body. At the same time, it also eliminates the need to assemble the valve core and the shielding component outside the valve body. As a result, the assembly steps of the valve device as a whole can be simplified and the assembly efficiency can be improved. Attached Figure Description

[0032] 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.

[0033] Figure 1 This is a schematic diagram of the structure of an embodiment of the valve device of this utility model;

[0034] Figure 2 This is an exploded view of an embodiment of the valve device of this utility model;

[0035] Figure 3 This is a schematic diagram of the valve body from another perspective in an embodiment of this utility model;

[0036] Figure 4 This is a schematic diagram of the assembly of the drive shaft and the fixed assembly in an embodiment of this utility model;

[0037] Figure 5 This is a cross-sectional view of an embodiment of the valve device of this utility model;

[0038] Figure 6 This is a schematic diagram of the structure of one embodiment of the valve core assembly in this utility model;

[0039] Figure 7 for Figure 6 Another perspective on the embodiments;

[0040] Figure 8 This is a cross-sectional view of another embodiment of the valve device of this utility model;

[0041] Figure 9 This is a schematic diagram of another embodiment of the valve core assembly in this utility model.

[0042] Figure 10 This is a schematic diagram of an embodiment of the gas water heater of this utility model.

[0043] Explanation of icon numbers:

[0044]

[0045]

[0046] 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

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Gas water heaters often experience significant temperature fluctuations when water flow changes, such as sudden changes in water temperature, or the water temperature changing drastically after being turned off and on again. Related technologies address this by incorporating a valve into the hot water system. However, these valves typically involve a valve core and a blocking component working together to release water. Assembly requires multiple steps, including fitting the valve core to the blocking component and the blocking component to the inner wall of the valve body, leading to complex assembly processes and low efficiency.

[0052] Therefore, this utility model proposes a valve device to reduce the assembly difficulty of the valve device. It is understood that the valve device is applied in a gas water heater, which includes an inlet pipe 200, an outlet pipe 300, and a heat exchanger 400. The 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 can be improved, and the constant temperature performance can be enhanced. The structure of this valve device 100 will be described below by way of an embodiment.

[0053] like Figures 1 to 3 as well as Figure 5 As shown, the valve device 100 includes a valve body 1, a shielding member 14, and a valve core assembly 2. 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 is connected to the valve cavity 101 through a first water inlet 121. A shielding member 14 is integrally formed in the valve body 1. The shielding member 14 is provided with a second water inlet 131 communicating with the second outlet channel 13 and 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 rotates in the valve cavity 101 to shield 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 rotates with the shielding member 14 to shield or open the second water inlet 131 to adjust the conduction area between the valve cavity 101 and the second outlet channel 13.

[0054] 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.

[0055] 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.

[0056] 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 5 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, first water inlet port 121 is located within valve cavity 101. The peripheral wall surface; 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 on the shielding member 14. In some embodiments, the second water inlet 131 may be located on the peripheral wall surface or one axial end of the valve cavity 101. 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 separated from the valve cavity 101 by the shielding member 14, 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.

[0057] 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 is used to regulate the flow rate of the first outlet channel 12, and the second valve core 22 is used to regulate the flow rate of the second outlet channel 13. It is understood that this valve device 100 achieves the function of distributing the outlet 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.

[0058] In this embodiment, a shielding member 14 is integrally formed inside the valve body 1, and a second water inlet 131 is disposed on the shielding member 14. The second valve core 22 achieves the water flow rate through the second water inlet 131 by rotating and engaging with the shielding member 14 to shield or open the second water inlet 131. Compared with the method in related technologies where a separate shielding member 14 is used to cooperate with the valve core for water discharge, this embodiment can manufacture the valve body 1 and the shielding member 14 as an integral part, and the valve core assembly 2 can be directly assembled into the valve body 1 to cooperate with the shielding member 14, eliminating the assembly steps of the shielding member 14 and the valve body 1. At the same time, there is no need to assemble the valve core and the shielding member 14 outside the valve body 1. Thus, the overall assembly steps of the valve device 100 are simplified, and the assembly efficiency is improved.

[0059] It should be noted that in practical applications, the shielding part 14 can be integrally formed only at the position of the second water inlet 131, or the shielding part 14 can be integrally formed at the positions of both the second water inlet 131 and the first water inlet 121. When the shielding part 14 is integrally formed at the positions of both water inlets, the first valve core 21 and the second valve core 22 respectively cooperate with the corresponding shielding part 14.

[0060] Understandably, the specific structure of the shielding component 14 can be determined according to the actual situation. For example, it can be a plate-like structure, a block-like structure, a cylindrical structure, or some other structure. Understandably, the way the shielding component 14 is integrally formed 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 shielding component 14 and the valve body 1 can be integrally formed using a casting process; when the valve body 1 is a plastic part, the shielding component 14 and the valve body 1 can be integrally formed using a mold or 3D printing.

[0061] 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.

[0062] 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:

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 in the valve cavity 101. The valve core assembly 2 has a first valve core 21 and a second valve core 22 axially spaced apart. The first valve core 21 rotates to block or open the first... The water inlet 121 adjusts the conduction area between the valve chamber 101 and the first water outlet channel 12. The second valve core 22 rotates to block or open the second water inlet 131 to adjust the conduction area between the valve chamber 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 fluctuation of water temperature and enhance the constant temperature performance.

[0067] Furthermore, in this embodiment, by setting the shielding member 14 that cooperates with the second valve core 22 to discharge water as integrally formed with the valve body 1, the assembly steps of the shielding member 14 and the valve body 1 are eliminated. At the same time, it is not necessary to assemble the valve core and the shielding member 14 outside the valve body 1. Thus, the assembly steps of the valve device 100 as a whole can be simplified and the assembly efficiency can be improved.

[0068] In one embodiment of this application, as Figure 5 and Figure 8 The shielding member 14 is located at one axial end of the valve cavity 101, separating the second water outlet channel 13 from the valve cavity 101; the axial end face of the second valve core 22 is rotatably engaged with the shielding member 14 to block or open the second water inlet 121.

[0069] Understandably, the blocking member 14 can be disposed at the axial end of the valve cavity 101 or in the circumferential direction of the valve cavity 101. In this embodiment, the blocking member 14 is disposed at one axial end of the valve cavity 101, separating the second water outlet channel 13 from the valve cavity 101, so that the second water inlet 131 is located on the blocking member 14 or between the blocking member 14 and the peripheral wall surface 101a of the valve cavity 101, so that when the second valve core 22 rotates in the valve cavity 101, the axial end face of the second valve core 22 can rotate relative to the blocking member 14 to block or open the second water inlet 131, thereby regulating the flow rate at the second water inlet 131.

[0070] Optionally, when the periphery of the shield 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 shield 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.

[0071] Optionally, the side of the shield 14 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.

[0072] Furthermore, the shielding member 14 is a plate, and the second water inlet 121 passes through the shielding member 14 along the axial direction of the valve cavity 101; the axial end face of the second valve core 22 is basically fitted with the axial end face of the shielding member 14.

[0073] In this embodiment, by setting the shielding member 14 as a plate, compared with other structures such as cylindrical or block structures, the plate structure has a simpler shape and is easier to integrally mold inside the valve body 1, with a lower molding process difficulty. By having the axial end face of the second valve core 22 substantially fit against the axial end face of the shielding member 14, there is no or very little flow gap between them, ensuring the sealing effect of the second valve core 22 on the second water inlet 131.

[0074] Specifically, such as Figures 5 to 9 The second valve core 22 is a baffle; the second valve core 22 is provided with a flow port 22a that communicates with the valve cavity 101. When the second valve core 22 rotates, it can drive the flow port 22a to move relative to the second water inlet 131, so as to adjust the overlap area between the flow port 22a and the second water inlet 131.

[0075] Understandably, 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 can be adjusted by adjusting the overlapping 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. Optionally, the flow port 22a can be a through hole or notch on the second valve core 22.

[0076] 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, and 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 substantially tangent to the peripheral wall surface 101a of the valve cavity 101. "Substantially tangent" here means that the outer peripheral surface of the second valve core 22 is in contact or substantially in contact with the peripheral wall surface 101a of the valve cavity 101, so that there is no flow gap or only 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 improving the sealing effect of the second valve core 22 on the second water inlet 131. Furthermore, the central angle of the second valve core 22 is larger than the central angle of the second water inlet 131. This configuration allows the second valve core 22 to completely seal the second water inlet 131 during rotation.

[0077] 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 be able to 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 A3 of the second water inlet 131 is set to satisfy: 80°≤A3≤180°, and 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°.

[0078] In one embodiment of this application, as Figure 2 , Figure 3 , Figure 5 as well as Figure 8 The valve body 1 has an installation port 15 at one end of the valve cavity 101 that is axially away from the shielding member 14. The installation port 15 is coaxially arranged with the valve cavity 101. The valve core assembly 2 is axially inserted into the valve cavity 101 through the installation port 15. The axial end face of the second valve core 22 is rotatably engaged with the shielding member 14.

[0079] In this embodiment, the valve body 1 is provided with an installation port 15, so that the valve core assembly 2 can be installed into the valve cavity 101 through the installation port 15. By setting the installation port 15 and the valve cavity 101 coaxially, the valve core assembly 2 only needs to be inserted along the axial direction of the valve cavity 101, so that the valve core assembly 2 does not need to be installed in multiple directions, nor does it need to perform multiple positioning operations on the rotation center of the valve core assembly 2.

[0080] By placing the blocking member 14 at the end of the valve cavity 101 axially away from the mounting port 15, when the valve core assembly 2 is inserted into the valve cavity 101 from the mounting port 15, it can drive the second valve core 22 to move towards the blocking member 14 until the axial end face of the second valve core 22 engages with the blocking member 14. Thus, when the second valve core 22 rotates, it can block or open the second water inlet 131, thereby regulating the water flow through the second water inlet 131. Furthermore, this design can further simplify the installation steps of the valve core assembly 2.

[0081] Specifically, the shielding member 14 is provided with a mounting hole 1, which is coaxially arranged with the valve cavity 101; the second valve core 22 is provided with a protruding shaft 221 on the axial end face away from the first valve core 21. When the valve core assembly 2 is inserted into the valve cavity 101 through the mounting port 15, the protruding shaft 221 is rotatably engaged in the mounting hole 1.

[0082] Understandably, the central axis of the mounting hole 1 is consistent with the central axis of the valve cavity 101, and the central axis of the protruding shaft 221 is consistent with the central axis of the valve cavity 101. During assembly, the mounting hole 1 and the protruding shaft 221 can play a role in the installation and positioning of the valve core assembly 2. Thus, when the valve core assembly 2 is inserted into the valve cavity 101 through the mounting port 15, the protruding shaft 221 of the second valve core 22 can be directly rotated and fitted into the mounting hole 1, so that the axial end face of the second valve core 22 fits with the plate surface of the shield 14, without the need for additional positioning and limiting operations on the valve core assembly 2.

[0083] In one embodiment of this application, as Figures 1 to 5 The valve device 100 also includes a fixed sleeve 4 sealed and installed in the mounting port 15 and a drive assembly 3 installed in the fixed sleeve 4. The fixed sleeve 4 is provided with an assembly hole 41. The valve core assembly 2 also includes a drive shaft 24 connected to the first valve core 21. The drive shaft 24 of the valve core assembly 2 is sealed and fitted in the assembly hole 41 and extends out of the fixed sleeve 4 to drive the drive assembly 3. The drive assembly 3 is used to drive the valve core assembly 2 to rotate.

[0084] 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.

[0085] During assembly, the drive shaft 24 of the valve core assembly 2 can be installed into the mounting hole 41 of the fixed sleeve 4 first, so that the valve core assembly 2 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 1 on the shield 14. At the same time, 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 drive shaft 24, thereby realizing the assembly of the valve body 1, the valve core assembly 2, the fixed sleeve 4 and the drive assembly 3.

[0086] Furthermore, such as Figure 4 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.

[0087] 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.

[0088] In one embodiment of this application, as Figure 5 and Figure 8 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.

[0089] 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 first water inlet 121 is blocked, the second water inlet 131 is fully open; when the second water inlet 131 is blocked, the first water inlet 121 is fully open.

[0090] 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.

[0091] 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 circumferential surface 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 circumferential 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 circumferential 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.

[0092] As an example, the first water inlet 121 is provided on the peripheral wall surface 101a of the valve cavity 101, and the outer peripheral surface of 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; the second water inlet 131 extends along the axial direction of the valve cavity 101, and the second valve core 22 rotates in the valve cavity 101 to block or open the second water inlet 131.

[0093] 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, the outer peripheral surface of the first valve core 21 can block or open the first water inlet 121, thereby adjusting the opening degree of the first water inlet 121. It can be 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 reduce 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. Specifically, the second valve core 22 is located upstream of the blocking member 14, so that the second valve core 22 is positioned upstream of the second water inlet 131, allowing the water pressure to increase the blocking force of the second valve core 22 on the second water inlet 131.

[0094] 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.

[0095] In one embodiment, such as Figures 5 to 7 The first valve core 21 has a cylindrical structure; the end of the first valve core 21 close to the second valve core 22 is open, and the end away from the second valve core 22 is closed. A flow passage 213 communicating with the valve cavity 101 is formed inside the first valve core 21; a flow passage 2 connected to the flow passage 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 passage 2 to move relative to the first water inlet 121, so as to adjust the overlap area between the flow passage 2 and the first water inlet 121.

[0096] 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 2 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 2, 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 communication area between the flow-through hole 2 and the first water inlet 121, thereby adjusting the opening degree of the first water inlet 121. 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.

[0097] Furthermore, the flow passage 2 extends circumferentially along the first valve core 21. It can be understood that by extending the flow passage 2 circumferentially along the first valve core 21, the flow passage 2 can rotate along the peripheral wall 101a of the valve cavity 101 when rotating, ensuring the smoothness of the adjustment of the conduction area between the valve cavity 101 and the first water outlet channel 12.

[0098] Furthermore, the flow passage 2 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 2 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.

[0099] 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.

[0100] 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 2 is set from cracking due to insufficient material and low strength.

[0101] In another embodiment, such as Figure 8 and Figure 9 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.

[0102] 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.

[0103] Furthermore, in one embodiment, as Figure 6 and Figure 7 The connecting structure 23 includes multiple connecting rods 232 that connect the first valve core 21 and the second valve core 22, and the multiple connecting rods 232 are arranged at intervals around the rotation center. This arrangement can prevent the rotating shaft 231 from stirring in the valve cavity 101 and causing turbulence, thereby reducing water flow resistance.

[0104] In practical applications, the multiple connecting rods 232 are preferably used in structures where the first valve core 21 is a cylinder 212. The multiple connecting rods 232 are distributed at intervals 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. Compared with the solution of setting the connecting rods 232 in the middle of the valve cavity 101, it can further reduce the disturbance to the water flow and reduce the water flow resistance.

[0105] 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.

[0106] In another embodiment, such as Figure 8 and Figure 9 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.

[0107] This utility model also proposes a gas water heater, such as Figure 5 and 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.

[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 by 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 is connected to the valve cavity through a first water inlet. A shielding component, integrally formed within the valve body, is provided with a second water inlet connecting the second water outlet channel and 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 rotating within the valve cavity to block or open the first water inlet, for adjusting the conduction area between the valve cavity and the first water outlet channel, and the second valve core rotating in cooperation with the blocking member 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 of claim 1, wherein The shielding member is located at one axial end of the valve cavity, separating the second water outlet channel from the valve cavity; The axial end face of the second valve core rotates with the shielding member to block or open the second water inlet.

3. The valve device of claim 2, wherein The shielding member is a plate, and the second water inlet passes through the shielding member along the axial direction of the valve cavity; The axial end face of the second valve core is substantially fitted to the axial end face of the shielding member.

4. The valve device of claim 3, wherein The second valve core is a baffle; the second valve core is provided with a flow port communicating with the valve cavity. 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.

5. The valve device of claim 4, wherein The second water inlet is a fan-shaped hole with the central axis of the valve cavity as its center; The radial cross-section of the second valve core is fan-shaped, and the central angle of the second valve core is larger than the central angle of the second water inlet.

6. The valve device of claim 5, wherein The central angle A3 of the second water inlet satisfies: 80°≤A3≤180°.

7. Valve device according to any of claims 2 to 6, characterized in that The periphery of the shield is connected to the peripheral wall of the valve cavity, and the second water inlet is formed by an opening in the shield; Alternatively, the shielding member may have a notch to enclose the peripheral wall of the valve cavity to form the second water inlet.

8. Valve device according to any of claims 2 to 6, characterized in that The valve body has a mounting port at one end of the valve cavity that is axially opposite to the shielding member, and the mounting port is coaxially arranged with the valve cavity; The valve core assembly is axially inserted into the valve cavity via the mounting port, and the axial end face of the second valve core is rotatably engaged with the shielding member.

9. The valve apparatus of claim 8, wherein The shielding component is provided with a mounting hole, which is coaxially arranged with the valve cavity; The second valve core has a protruding shaft on its axial end face away from the first valve core. When the valve core assembly is inserted into the valve cavity through the mounting port, the protruding shaft rotates and engages with the mounting hole.

10. The valve apparatus of claim 8, wherein The valve device further includes a fixed sleeve sealed and installed in the mounting port and a drive assembly installed in the fixed sleeve, the fixed 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 is sealed to the mounting hole and extends out of the fixing sleeve to drive the drive assembly.

11. The valve device according to any one of claims 1 to 6, wherein 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.

12. The valve apparatus of claim 11, wherein The first water inlet is located on the peripheral wall of the valve cavity, and the outer peripheral surface of the first valve core is rotatably engaged with the peripheral wall of the valve cavity. The first valve core has a cylindrical structure; 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; a flow hole communicating with the flow cavity is opened on the peripheral wall of the first valve core, and 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; or, 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.

13. A gas water heater, characterized by, It includes an inlet pipe, an outlet pipe, a heat exchanger, and a valve device as described in any one of claims 1 to 12, 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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