Valve assembly and water heater

Abstract

The utility model provides a valve assembly and a water heater. The valve assembly comprises a valve body, a valve element shell and a valve rod. A containing cavity used for containing the valve element shell and the valve rod is formed in the valve body, and the valve body is further provided with a water inlet, a water using opening and a circulating opening which communicate with the containing cavity. The valve rod is movably arranged in the valve element shell. A first valve clack and a second valve clack are arranged on the valve rod, the first valve clack and the second valve clack are distributed at intervals in the axial direction of the valve rod, the first valve clack is arranged close to the water using opening, and the second valve clack is arranged close to the circulating opening; water flow flows into the containing cavity from the water inlet and then flows to the water port and the circulation port, the area of the water flow acting on the first valve clack is larger than that of the water flow acting on the second valve clack, and therefore under the pressurization working condition, the valve clack drives the valve rod to move towards the water port to block the circulation port. According to the water heater, the blocking effect is achieved under the pressurizing working condition through the water pressure difference, waste caused when hot water enters the circulation opening is reduced, the water using efficiency is improved when the pressurizing function of the water heater is started, and user experience is improved.

Description

Technical Field

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

[0002] In recent years, with the improvement of living standards, users' demand for instant hot water supply and stable water pressure has significantly increased. The zero-cold-water function ensures that users can immediately obtain hot water when they turn on the tap, without waiting for cold water to drain from the pipes. The pressurization function aims to solve the problem of insufficient water pressure in high-rise residential buildings or long-distance water supply points, providing a more stable and sufficient flow of hot water. Most households often need to install an additional return water pipe to achieve the zero-cold-water function, which not only increases installation costs but also occupies space. To solve this problem, the common practice is to install a one-way valve at the furthest point of use, connecting the hot water pipe and the cold water pipe to form a closed loop. When the water heater activates the zero-cold-water mode, the circulation pump drives the water in the pipes to flow, reheating it through the gas water heater to maintain the water temperature in the hot water pipes, ensuring that users can use hot water at any time.

[0003] While the above methods address the need for zero cold water to some extent, new problems arise in practical applications when the water heater's booster function is also activated. Because the booster increases pipe pressure, some of the heated hot water flows backward into the circulation pipes during the circulation process, instead of being directly supplied to the user. This phenomenon wastes energy and reduces the overall efficiency of the system. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defect of low efficiency in the prior art where some hot water flows into the circulation loop instead of the water-using end when the water heater is pressurized, and to provide a valve assembly and a water heater.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A valve assembly includes a valve body, a valve core housing, and a valve stem; the valve body has a receiving cavity for accommodating the valve core housing and the valve stem, and the valve body also has an inlet, a water inlet, and a circulation port communicating with the receiving cavity;

[0007] The valve stem is located inside the valve core housing and can move within the channel formed by the water inlet and the circulation port; the valve stem is provided with a first valve disc and a second valve disc, which are distributed at intervals along the axial direction of the valve stem, with the first valve disc arranged closer to the water inlet and the second valve disc arranged closer to the circulation port, and the water inlet facing the area between the first valve disc and the second valve disc.

[0008] After the water flows into the receiving cavity from the inlet, it flows to the water outlet and the circulation outlet respectively. The area of ​​the water flow acting on the first valve disc is greater than the area of ​​the water flow acting on the second valve disc. So that when the pressure is increased, the valve stem moves towards the water outlet until the second valve disc contacts the valve core shell and blocks the circulation outlet.

[0009] In this solution, a valve stem is installed inside the valve core housing, and a first valve disc and a second valve disc with different areas and shapes are installed on the valve stem. The water flow acts on the first and second valve discs on the valve stem, creating a water pressure difference. This pressure difference pushes the valve stem towards the water inlet under pressurization conditions, causing the second valve disc on the valve stem to move towards the water inlet until it contacts the valve core housing, achieving a sealing effect. This reduces the amount of hot water flowing from the inlet to the circulation outlet, thus reducing waste.

[0010] Preferably, the valve core housing extends within the channel formed by the water inlet and the circulation port, and the valve core housing has a flow divider plate arranged along the radial direction of the channel, with the valve stem passing through the flow divider plate;

[0011] The diverter is located on the valve core housing in the area directly opposite the inlet, dividing the inlet into a first inlet that supplies water to the main inlet and a second inlet that supplies water to the circulation outlet. The area of ​​the first inlet is larger than that of the second inlet.

[0012] In this solution, a flow divider is installed on the valve core housing. The flow divider is positioned in the area of ​​the valve core housing directly opposite the water inlet to divide the flow of water into two parts. The water inlet is divided into a first inlet that supplies water to the water outlet and a second inlet that supplies water to the circulation outlet. The area of ​​the first inlet is larger than that of the second inlet, so that the flow rate to the water outlet is greater than the flow rate to the circulation outlet. This further increases the water pressure difference between the water flow direction and the circulation direction, making the valve stem more easily affected by the water pressure and moved towards the water outlet.

[0013] Preferably, the valve core housing is provided with a valve stem hole for sliding fit with the valve stem. The valve stem hole includes a first valve stem hole, a second valve stem hole and a third valve stem hole. The two ends of the valve core housing are respectively provided with the first valve stem hole and the second valve stem hole. The first valve stem hole is opened on the port near the water inlet. The through hole in the center of the diverter plate is the second valve stem hole. The third valve stem hole is opened on the port near the circulation port.

[0014] In this solution, valve stem holes are provided on the valve core housing and the flow divider, allowing the valve stem to slide in the valve stem holes, thereby limiting the radial position of the valve stem and enabling the valve stem to move axially within the valve core housing, thus making the movement of the valve stem and the sealing effect more stable.

[0015] Preferably, the valve core housing is provided with a first flow hole and a second flow hole, and the first flow hole and the second flow hole are arranged along the axial direction of the channel formed by the water inlet and the circulation port;

[0016] The first valve disc is located between the water inlet and the first flow hole, and the second valve disc is located between the circulation port and the second flow hole;

[0017] The end face of the first valve disc that is in direct contact with the water flow is called the first end face, and the end face of the second valve disc that is in direct contact with the water flow is called the second end face. The first flow hole is close to the water inlet, and the area of ​​the first flow hole is smaller than the area of ​​the first end face; the second flow hole is close to the circulation port, and the area of ​​the second flow hole is smaller than the area of ​​the second end face. The area of ​​the first end face is larger than the area of ​​the second end face, and the area of ​​the first flow hole is larger than the area of ​​the second flow hole.

[0018] In this design, the first valve disc and the first flow hole cooperate to form a water flow channel, and the second valve disc and the second flow hole cooperate to form a circulation channel. The area of ​​the first flow hole is larger than the area of ​​the second flow hole, so that the flow rate of the water used in the flow channel is greater than the flow rate of the circulation channel. The area of ​​the first end face is larger than the area of ​​the second end face, so that the area of ​​water flow acting on the first valve disc is greater than the area of ​​water flow acting on the second valve disc. Thus, under the pressure boosting condition, the valve stem is pushed towards the first valve disc, i.e., towards the water inlet. At this time, the second valve disc approaches the second flow hole, and the opening decreases until it is blocked, thereby reducing the amount of hot water entering the circulation port and reducing waste.

[0019] Preferably, the valve assembly further includes an elastic element, one end of which abuts against the second valve disc and the other end of which abuts against the valve core housing.

[0020] In this solution, the elastic element can be a spring. When the elastic element is a spring, it is arranged along the axial direction of the channel formed by the water inlet and the circulation port, with its two ends abutting against the second valve disc and the valve core housing, respectively. The elastic force acts on the second valve disc, causing the second valve disc to move towards the water inlet and contact the valve core housing, thus blocking the circulation port. When in circulation mode, the circulation pump works to pump water, and the water flow pushes the second valve disc to move towards the circulation port to release the blockage, allowing the water to enter the circulation port normally.

[0021] Preferably, the first valve disc is a cone shape, and the bottom surface of the cone shape is the first end face;

[0022] And / or, the second valve disc has a frustum-shaped profile, with the smaller end face being the second end face. When the valve stem moves toward the water inlet, the second end face abuts against the valve core housing to form a seal. The end of the second valve disc near the circulation port is provided with a groove to accommodate the elastic element. The elastic element is a spring, with one end of the spring abutting against the second valve disc and the other end abutting against the valve core housing.

[0023] In this design, the first valve disc is designed as a conical structure to increase the thrust exerted by water pressure through the bottom surface (first end face) towards the water inlet, and to reduce the thrust exerted by water pressure at the water inlet towards the circulation port, making the first valve disc more easily moved towards the water inlet under the influence of water pressure. The second valve disc is designed as a frustum-shaped profile to cooperate with the valve core housing to complete the one-way valve function and achieve a sealing effect when the valve core housing abuts against the second end face. The groove on the second valve disc is to accommodate the elastic element.

[0024] Preferably, the valve core housing is provided with two annular boss-shaped first valve seat and second valve seat extending toward the center of the valve core housing;

[0025] The first flow hole is provided on the first valve seat, and the second flow hole is provided on the second valve seat. The second valve seat is also provided with a fitting groove that matches the shape of the second valve disc, so that when the valve stem slides towards the water inlet end, the second valve disc fits into the second valve seat.

[0026] In this design, the first valve seat and the second valve seat cooperate with the first valve disc and the second valve disc, respectively, to achieve valve operation. The first valve seat and the second valve seat are respectively provided with a first flow hole and a second flow hole to allow water to flow through, forming a water flow channel and a circulation channel, respectively. The second valve seat is provided with a fitting groove that matches the shape of the second valve disc, so that when the valve stem slides towards the water inlet end, the second valve disc engages with the second valve seat to achieve a sealing effect.

[0027] Preferably, the valve core housing is a hollow cylindrical structure, and the side wall of the valve core housing includes multiple columns arranged circumferentially along the direction from the water inlet to the circulation outlet.

[0028] In this design, the valve core housing is a hollow cylindrical structure, allowing water to enter through the hollow parts and flow more smoothly within the receiving cavity. The valve core housing can be assembled from two symmetrical parts, making the manufacturing process and installation easier to implement.

[0029] Preferably, a sealing ring is provided inside the valve core housing, the sealing ring including a first sealing ring and a second sealing ring, and a first recess and a second recess are respectively provided on the valve core housing and the second valve disc for accommodating the sealing ring. The first sealing ring is embedded in the first recess so that the valve core housing and the valve body form a seal in the circulation port direction, and the second sealing ring is embedded in the second recess so that the valve core housing and the second valve disc cooperate to form a seal when in contact.

[0030] In this design, a first sealing ring is provided inside the valve core housing to cooperate with the valve core housing and the valve body to achieve a seal, so that the water flow can only flow through the second flow hole towards the circulation port; a second sealing ring is provided to increase the sealing performance when the second valve disc and the valve core housing are fitted together; the first and second recesses are provided to accommodate the first and second sealing rings respectively.

[0031] Furthermore, this utility model also provides the following technical solutions:

[0032] A water heater comprising the valve assembly described above.

[0033] The positive and progressive effects of this utility model are as follows: By setting a valve stem inside the valve core housing, and setting a first valve disc and a second valve disc with different areas and shapes on the valve stem, the water flow acts on the first valve disc and the second valve disc on the valve stem, creating a water pressure difference. This pushes the valve stem towards the water inlet under pressurization conditions, which in turn causes the second valve disc on the valve stem to move towards the water inlet until the second valve disc contacts the valve core housing, achieving a sealing effect. This reduces the amount of hot water flowing from the inlet to the circulation port, thus reducing waste. Attached Figure Description

[0034] Figure 1 This is an overall structural diagram of the valve assembly provided in an embodiment of the present utility model.

[0035] Figure 2 This is a schematic diagram of the valve core housing provided in an embodiment of the present utility model.

[0036] Figure 3 This is a structural cross-sectional view of the valve core housing provided in an embodiment of the present utility model.

[0037] Figure 4 This is a structural diagram of the valve stem provided in an embodiment of the present utility model.

[0038] Figure 5 This is a structural schematic diagram of the valve assembly in its original state as provided in an embodiment of this utility model.

[0039] Figure 6 This is a schematic diagram of the valve assembly in the pressurization state starting according to an embodiment of the present invention.

[0040] Figure 7 A schematic diagram of the valve assembly in a continuous pressurization state provided in an embodiment of this utility model.

[0041] Figure 8 This is a schematic diagram of the valve assembly in a cyclic state provided in an embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] Water flow channel 10

[0044] Circulating channel 20

[0045] Valve body 100

[0046] Reception cavity 101

[0047] Inlet 110

[0048] Water inlet 120

[0049] Circulation port 130

[0050] Cold water outlet 140

[0051] Valve core housing 200

[0052] First valve stem hole 201

[0053] Second valve stem hole 202

[0054] Third valve stem hole 203

[0055] Column 204

[0056] Valve stem 205

[0057] First valve disc 210

[0058] First flow hole 211

[0059] First valve seat 212

[0060] First end face 215

[0061] Second valve disc 220

[0062] Second flow hole 221

[0063] Second valve seat 222

[0064] Second end face 225

[0065] Fitting groove 227

[0066] 230 splitter

[0067] First bite 231

[0068] Second bite 232

[0069] Groove 239

[0070] Elastic element 240

[0071] First sealing ring 250

[0072] First concave platform 251

[0073] Second sealing ring 260

[0074] Second concave platform 261 Detailed Implementation

[0075] The present invention will be further described below by way of embodiments, and will be described more clearly and completely with reference to the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0076] This embodiment provides a valve assembly, which includes a valve body 100, a valve core housing 200, and a valve stem 205. The valve body 100 has a receiving cavity 101 for accommodating the valve core housing 200 and the valve stem 205. The valve body 100 also has a water inlet 110, a water outlet 12, a circulation outlet 130, and a cold water outlet 140 that communicate with the receiving cavity 101.

[0077] like Figure 1 and Figure 5 As shown, the valve stem 205 is disposed within the valve core housing 200 and is movable within the channel formed by the water inlet 120 and the circulation port 130; Figure 5 As shown, the channel is a transverse channel extending from the self-water inlet 120 to the circulation port 130. The valve stem 205 is provided with a first valve disc 210 and a second valve disc 220. The first valve disc 210 and the second valve disc 220 are distributed at intervals along the axial direction of the valve stem 205, with the first valve disc 210 arranged closer to the self-water inlet 120 and the second valve disc 220 arranged closer to the circulation port 130. The inlet 110 faces the area between the first valve disc 210 and the second valve disc 220. The cold water inlet 140 is an opening on the side of the valve body 100 near the circulation port 130 in the figure. When using cold water, cold water flows into the valve body 100 from the circulation port 130 and flows out from the cold water inlet 140. After the water flows into the receiving cavity 101 from the inlet 110, it flows to the water outlet 120 and the circulation port 130 respectively. The area of ​​the water flow acting on the first valve disc 210 is greater than the area of ​​the water flow acting on the second valve disc 220. So that when the pressure is increased, the valve stem 205 moves towards the water outlet 120 until the second valve disc 220 contacts the valve core housing 200 and blocks the circulation port 130.

[0078] In the above embodiment, by providing a valve stem 205 inside the valve core housing 200, and providing a first valve disc 210 and a second valve disc 220 with different areas and shapes on the valve stem 205, the water flow acts on the first valve disc 210 and the second valve disc 220 on the valve stem 205, thereby generating a water pressure difference. This pushes the valve stem 205 towards the water inlet 120 under pressurization conditions, and further causes the second valve disc 220 on the valve stem 205 to move towards the water inlet 120 until it contacts the valve core housing 200, achieving a sealing effect and reducing the flow of hot water from the inlet 110 towards the circulation port 130, thus reducing waste.

[0079] like Figure 5As shown, the valve core housing 200 extends within the channel formed by the water inlet 120 and the circulation port 130. The valve core housing 200 has a flow divider 230, which is arranged along the radial direction of the channel. The flow divider 230 and the valve core housing 200 are an integral structure. The flow divider 230 is a disc with a through hole in the center. The valve stem 205 passes through the flow divider 230. The flow divider 230 is located in the area of ​​the valve core housing 200 directly opposite the water inlet 110, and divides the water inlet 110 into a first port 231 that supplies water to the water inlet 120 and a second port 232 that supplies water to the circulation port 130. The area of ​​the first port 231 is larger than the area of ​​the second port 232.

[0080] like Figure 5 As shown, by setting a flow divider 230 on the valve core housing 200, the flow divider 230 is set in the area of ​​the valve core housing 200 directly opposite the water inlet 110, which plays a role in diverting the flow and dividing the flow rate of water entering the water inlet 110. By dividing the water inlet 110 into a first port 231 that supplies water to the water inlet 120 and a second port 232 that supplies water to the circulation port 130, and making the area of ​​the first port 231 larger than the area of ​​the second port 232, the flow rate to the water inlet 120 is greater than the flow rate to the circulation port 130, which further increases the water pressure difference between the water flow in the water use direction and the circulation direction, making the valve stem 205 more easily affected by the water pressure and move towards the water inlet 120, thus realizing the function of the valve assembly.

[0081] Ideally, the flow divider 230 should be arranged along the radial direction of the channel. In actual products, the flow divider 230 can also be basically parallel to the radial direction.

[0082] like Figure 3 As shown, the valve core housing 200 is provided with a valve stem hole, which slides with the valve stem 205. The valve stem hole includes a first valve stem hole 201, a second valve stem hole 202 and a third valve stem hole 203. The two ends of the valve core housing 200 are respectively provided with the first valve stem hole 201 and the second valve stem hole 202. The first valve stem hole 201 is opened on the port near the water inlet 120, the through hole in the center of the diverter plate 230 is the second valve stem hole 202, and the third valve stem hole 203 is opened on the port near the circulation port 130.

[0083] In the above embodiment, by providing valve stem holes on the valve core housing 200 and the flow divider 230, the valve stem 205 slides with the valve stem hole to limit the radial position of the valve stem 205, so that the valve stem 205 moves axially within the valve core housing 200, making the movement and sealing effect of the valve stem 205 more stable.

[0084] like Figure 5 and Figure 6As shown, the valve core housing 200 is provided with a first flow hole 211 and a second flow hole 221. The first flow hole 211 and the second flow hole 221 are arranged along the axial direction of the channel formed by the water inlet 120 and the circulation port 130. The first valve disc 210 is located between the water inlet 120 and the first flow hole 211, and the second valve disc 220 is located between the circulation port 130 and the second flow hole 221.

[0085] like Figure 4 and Figure 5 The end face of the first valve disc 210 that is in direct contact with the water flow is the first end face 215, and the end face of the second valve disc 220 that is in direct contact with the water flow is the second end face 225. The first flow hole 211 is close to the water inlet 120, and the area of ​​the first flow hole 211 is smaller than the area of ​​the first end face 215. The second flow hole 221 is close to the circulation port 130, and the area of ​​the second flow hole 221 is smaller than the area of ​​the second end face 225. The area of ​​the first end face 215 is larger than the area of ​​the second end face 225, and the area of ​​the first flow hole 211 is larger than the area of ​​the second flow hole 221.

[0086] In the above embodiment, the first valve disc 210 and the first flow hole 211 cooperate to form a water flow channel 10, and the second valve disc 220 and the second flow hole 221 cooperate to form a circulation channel 20. The area of ​​the first flow hole 211 is larger than the area of ​​the second flow hole 221, so that the flow rate of the water flow channel 10 is greater than the flow rate of the circulation channel 20. The area of ​​the first end face 215 is larger than the area of ​​the second end face 225, so that the area of ​​water flow acting on the first valve disc 210 is greater than the area of ​​water flow acting on the second valve disc 220. Thus, under the pressurization condition, the valve stem 205 is pushed towards the first valve disc 210, that is, towards the water inlet 120. At this time, the second valve disc 220 approaches the second flow hole 221, and the opening decreases until it is blocked, thereby reducing the amount of hot water entering the circulation port 130 and reducing waste.

[0087] like Figure 5 As shown, the valve assembly also includes an elastic element 240, one end of which abuts against the second valve disc 220 and the other end of which abuts against the valve core housing 200.

[0088] In the above embodiment, the elastic element 240 can be a spring. When the elastic element 240 is a spring, it is arranged along the axial direction of the channel formed by the water inlet 120 and the circulation port 130. Its two ends abut against the second valve disc 220 and the valve core housing 200, respectively, and act on the second valve disc 220 with elastic force. When the working state is not a pressurization state or a circulation state, the second valve disc 220 is moved towards the water inlet 120 and contacts the valve core housing 200, blocking the circulation port 130. When the circulation state is in operation, the circulation pump works to pump water, and the water flow pushes the second valve disc 220 to move towards the circulation port 130 to release the blockage, and the water flow normally enters the circulation port 130 for circulation.

[0089] like Figure 4 and Figure 5 As shown, the first valve disc 210 is a cone-shaped body, and the bottom surface of the cone-shaped body is the first end face 215; the second valve disc 220 has a frustum-shaped profile, and the end face with the smaller area is the second end face 225. When the valve stem 205 moves toward the water inlet 120, the second end face 225 abuts against the valve core housing 200 to form a seal. The end of the second valve disc 220 near the circulation port 130 is provided with a groove 239 to accommodate the elastic element 240; the elastic element 240 is a spring, one end of the spring abuts against the second valve disc 220, and the other end abuts against the valve core housing 200.

[0090] In the above embodiment, the first valve disc 210 is designed with a conical structure to increase the thrust exerted by water pressure through the bottom surface, i.e., the first end face 215, towards the water inlet 120, and to reduce the thrust exerted by water pressure at the water inlet 120 towards the circulation port 130, making the first valve disc 210 more easily affected by water pressure and moved towards the water inlet 120. The second valve disc 220 is designed with a frustum-shaped profile to cooperate with the valve core housing 200 to complete the one-way valve function and achieve a sealing effect when the valve core housing 200 abuts against the second end face 225. The second valve disc 220 has a groove 239 to accommodate the elastic element 240.

[0091] like Figure 3 As shown, the valve core housing 200 is provided with two annular bosses extending toward the center of the valve core housing 200: a first valve seat 212 and a second valve seat 222; as Figure 3 As shown, the first flow hole 211 is provided on the first valve seat 212, and the second flow hole 221 is provided on the second valve seat 222. The second valve seat 222 is also provided with a fitting groove 227 that matches the shape of the second valve disc 220, so that when the valve stem 205 slides toward the water inlet 120, the second valve disc 220 fits into the second valve seat 222.

[0092] In the above embodiment, the first valve seat 212 and the second valve seat 222 respectively cooperate with the first valve disc 210 and the second valve disc 220 to realize the valve function. The first valve seat 212 and the second valve seat 222 are respectively provided with a first flow hole 211 and a second flow hole 221 to allow water to flow through, forming a water flow channel 10 and a circulation flow channel 20 respectively. The second valve seat 222 is provided with a fitting groove 227 that matches the shape of the second valve disc 220. When the valve stem 205 slides towards the water inlet 120, the second valve disc 220 fits into the second valve seat 222 to achieve a sealing effect.

[0093] like Figure 2 and Figure 3As shown, the valve core housing 200 is a hollow cylindrical structure. The side wall of the valve core housing 200 includes a plurality of columns 204 arranged circumferentially along the direction from the water inlet 120 to the circulation port 130. The columns 204 extend along the length of the valve core housing to form the outer peripheral part of the valve core housing 200. A portion of the columns 204 extend from both ends of the hollow cylindrical structure toward the middle until they abut against the first valve seat 212 and the second valve seat 222. Another portion of the columns 204 are located between the first valve seat 212 and the second valve seat 222 and pass through the diverter plate 230.

[0094] In the above embodiment, the valve core housing 200 is a hollow cylindrical structure, allowing water to enter through the hollow portion and flow more smoothly within the receiving cavity 101. The valve core housing 200 can be assembled from two symmetrical parts, making the manufacturing process and installation easier to implement.

[0095] like Figure 1 and Figure 5 As shown, a sealing ring is provided inside the valve core housing 200. The sealing ring includes a first sealing ring 250 and a second sealing ring 260. The valve core housing 200 and the second valve disc 220 are respectively provided with a first recess 251 and a second recess 261 for accommodating the sealing ring. The first sealing ring 250 is embedded in the first recess 251 so that the valve core housing 200 and the valve body 100 form a seal in the direction of the circulation port 130. The second sealing ring 260 is embedded in the second recess 261 so that the valve core housing 200 and the second valve disc 220 cooperate to form a seal when in contact.

[0096] In the above embodiment, a first sealing ring 250 is provided inside the valve core housing 200 to cooperate with the valve core housing 200 and the valve body 100 to achieve a seal, so that the water flow can only flow through the second flow hole 221 to the circulation port 130; a second sealing ring 260 is provided to increase the sealing performance when the second valve disc 220 and the valve core housing 200 are fitted together; the first recess 251 and the second recess 261 are provided to accommodate the first sealing ring 250 and the second sealing ring 260 respectively.

[0097] The following parts are combined Figure 5-8 This describes the different working states of this embodiment.

[0098] like Figure 5 As shown, in the original working state, the elastic element 240 is arranged along the axial direction of the channel formed by the water inlet 120 and the circulation port 130, with its two ends abutting against the second valve disc 220 and the valve core housing 200 respectively. The elastic force acts on the second valve disc 220, causing the second valve disc 220 to move towards the water inlet 120 and contact the valve core housing 200, thus blocking the circulation port 130.

[0099] like Figure 6As shown, in the initial pressurization state, both the first valve disc and the second valve disc 220 are acted upon and pushed by the water flow. Some hot water flows from the water flow channel into the water inlet, and some hot water flows from the circulation channel 20 into the circulation port 130. However, as the pressurization continues, the pressure exerted by the water flow on the first valve disc 210 and the second valve disc 220 increases due to the area difference between the first end face 215 and the second end face 225, as well as the diversion effect of the flow divider 230, resulting in a larger water volume in the water flow channel 10, which pushes the valve stem 205 towards the water inlet 120.

[0100] like Figure 7 As shown, after the valve assembly starts, it enters a continuous pressurization state. The second valve disc 220 approaches the second valve seat 222 until it fits into the fitting groove 227. With the cooperation of the second sealing ring 260, the second flow hole 221 is blocked. The valve core shell 200 cooperates with the first sealing ring 250 and the valve body 100 to form a seal. The flow rate of the circulation channel 20 decreases until it disappears, while the flow rate of the water channel 10 increases. The efficiency of hot water use is improved, and waste is reduced.

[0101] like Figure 8 As shown, when the valve assembly activates the circulation function, the circulation pump works to pump water, and the water flow pushes the second valve disc 220 to move towards the circulation port 130 to release the blockage, allowing the water to enter the circulation port 130 normally for circulation.

[0102] This embodiment also provides a water heater, which includes the valve assembly described above.

[0103] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A valve assembly, characterized by The valve assembly comprises a valve body, a valve core shell and a valve rod; the valve body is internally provided with an accommodating cavity for accommodating the valve core shell and the valve rod, and the valve body is further provided with a water inlet, a water outlet and a circulation port which are communicated with the accommodating cavity; The valve rod is arranged in the valve core shell and can move in a channel formed by the water outlet and the circulation port; the valve rod is provided with a first valve flap and a second valve flap, the first valve flap and the second valve flap are arranged along the axial direction of the valve rod, the first valve flap is arranged close to the water outlet, the second valve flap is arranged close to the circulation port, and the water inlet is arranged towards the region between the first valve flap and the second valve flap; After water flows into the accommodating cavity from the water inlet, the water flows to the water outlet and the circulation port respectively, the area on which the water acts on the first valve flap is larger than the area on which the water acts on the second valve flap, so that in the pressurization working condition, the valve rod moves towards the water outlet until the second valve flap contacts the valve core shell and blocks the circulation port.

2. The valve assembly of claim 1, wherein, The valve core shell extends in the channel formed by the water outlet and the circulation port, the valve core shell is provided with a flow dividing plate, the flow dividing plate is arranged along the radial direction of the channel, and the valve rod is arranged in the flow dividing plate; The flow dividing plate is arranged at the region of the valve core shell opposite to the water inlet, and divides the water inlet into a first port for supplying water to the water outlet and a second port for supplying water to the circulation port, and the area of the first port is larger than the area of the second port.

3. The valve assembly of claim 2, wherein, The valve core shell is provided with a valve rod hole in sliding fit with the valve rod, the valve rod hole comprises a first valve rod hole, a second valve rod hole and a third valve rod hole, and the two ends of the valve core shell are respectively provided with the first valve rod hole and the second valve rod hole, wherein the first valve rod hole is arranged on the end port close to the water outlet, the through hole arranged in the center of the flow dividing plate is the second valve rod hole, and the third valve rod hole is arranged on the end port close to the circulation port.

4. The valve assembly of claim 1, wherein, The valve core shell is provided with a first flow passage hole and a second flow passage hole, and the first flow passage hole and the second flow passage hole are arranged along the axial direction of the channel formed by the water outlet and the circulation port; The first valve flap is located between the water outlet and the first flow passage hole, and the second valve flap is located between the circulation port and the second flow passage hole; The end face of the first valve flap which is in face contact with the water flow is a first end face, the end face of the second valve flap which is in face contact with the water flow is a second end face, the first flow passage hole is close to the water outlet, and the area of the first flow passage hole is smaller than the area of the first end face; the second flow passage hole is close to the circulation port, and the area of the second flow passage hole is smaller than the area of the second end face, the area of the first end face is larger than the area of the second end face, and the area of the first flow passage hole is larger than the area of the second flow passage hole.

5. The valve assembly of claim 4, wherein, The valve assembly further comprises an elastic member, one end of the elastic member is abutted to the second valve flap, and the other end of the elastic member is abutted to the valve core shell.

6. The valve assembly of claim 5, wherein, The first valve flap is a conical body, and the bottom surface of the conical body is the first end face. And / or, the second valve disc is in a circular truncated cone shape, the end face of the smaller area is the second end face, the second end face abuts against the valve core shell to form a seal when the valve rod moves towards the water outlet, and the end of the second valve disc close to the circulation port is provided with a groove to accommodate the elastic member; the elastic member is a spring, one end of the spring abuts against the second valve disc, and the other end abuts against the valve core shell.

7. The valve assembly of claim 4, wherein, The valve core shell is provided with two annular boss-shaped first valve seats and second valve seats extending to the center of the valve core shell; The first flow-through hole is arranged on the first valve seat, and the second flow-through hole is arranged on the second valve seat, and the second valve seat is further provided with a fitting groove matched with the shape of the second valve disc, so that when the valve rod slides towards the water outlet end, the second valve disc is fitted with the second valve seat.

8. The valve assembly of claim 1, wherein, The valve core shell is a hollow cylindrical structure, and the side wall of the valve core shell includes a plurality of vertical columns arranged circumferentially in the direction from the water outlet to the circulation port.

9. The valve assembly of claim 1, wherein, The valve core shell is provided with a sealing ring, and the sealing ring includes a first sealing ring and a second sealing ring, and the valve core shell and the second valve disc are respectively provided with a first recess and a second recess for accommodating the sealing ring, the first sealing ring is embedded in the second recess to form a seal between the valve core shell and the valve body in the circulation port direction, and the first sealing ring is embedded in the second recess to form a seal when the valve core shell and the second valve disc are in contact.

10. A water heater, characterized by The water heater comprises the valve assembly according to any one of claims 1-9.

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