Expansion tank assembly and unit

Abstract

The utility model relates to an expansion tank assembly and a unit. The expansion tank assembly comprises an expansion tank, the expansion tank comprises a tank body and a connector part arranged at the bottom of the tank body, the tank body is provided with an inner cavity, an inlet and outlet flow channel is formed in the connector part, and the inlet and outlet flow channel communicates with the inner cavity; the valve assembly comprises a main body part, the main body part is provided with a first port, a second port and a third port, a first flow channel and a second flow channel communicated with the first flow channel are formed in the main body part, the first port and the second port are located at the two ends of the first flow channel, the third port is located at one end of the second flow channel, and the third port is connected with the connector part. The second flow channel is communicated with the inlet and outlet flow channel; the flow blocking component comprises a flow blocking plate and an installation blocking piece, the installation blocking piece is installed in the tank body and located in the inner cavity, one end of the flow blocking plate is fixedly connected with the installation blocking piece, the flow blocking plate penetrates through the second flow channel, and the other end of the flow blocking plate extends into the first flow channel. The expansion tank assembly can prevent liquid in the tank body from becoming dead water due to long-term non-flowing.

Description

Technical Field

[0001] This application relates to the technical field of expansion tanks, and particularly to an expansion tank assembly and a unit. Background Art

[0002] An expansion tank is a component connected to a water circuit system and can play a role in balancing the water pressure in the water circuit. Generally, the expansion tank has an inlet and outlet, which is connected to the pipeline of the water circuit system. When the pressure of the water circuit system is greater than the pressure of the expansion tank, the liquid in the water circuit system will enter the expansion tank. When the pressure of the water circuit system is less than the pressure of the expansion tank, the liquid in the expansion tank can be replenished into the pipeline of the water circuit system. In this way, the pressure fluctuation of the water circuit system can be controlled within a certain normal range.

[0003] However, when the water circuit system is working properly, the range of water pressure change is relatively small, the amount of regulated water flowing in and out of the expansion tank is not much, and the water flowing in and out of the tank each time is only replaced at the tank opening. This makes most of the water in the tank not replaced and updated and becomes stagnant water. These stagnant waters stay in the tank for a long time, are prone to breeding bacteria, and thus pose a safety hazard. Summary of the Utility Model

[0004] The embodiments of this application provide an expansion tank assembly and a unit, aiming to improve the problem that stagnant water is likely to form in the expansion tank.

[0005] In a first aspect, this application provides an expansion tank assembly. The expansion tank assembly includes: an expansion tank, including a tank body and an interface part provided at the bottom of the tank body. The tank body has an inner cavity, and an inlet and outlet flow channel is formed inside the interface part, and the inlet and outlet flow channel communicates with the inner cavity; a valve assembly, including a main body part, the main body part has a first port, a second port and a third port, and a first flow channel and a second flow channel communicating with the first flow channel are formed inside the main body part. The first port and the second port are located at both ends of the first flow channel, the third port is located at one end of the second flow channel, and the third port is connected to the interface part to make the second flow channel communicate with the inlet and outlet flow channel; and a flow blocking member, including a flow blocking plate and a mounting tab. The mounting tab is mounted on the tank body and is located in the inner cavity. One end of the flow blocking plate is fixedly connected to the mounting tab, the flow blocking plate penetrates through the second flow channel and the other end extends into the first flow channel.

[0006] In the expansion tank assembly in the embodiments of the present application, a flow blocking member is provided. The flow blocking member includes a flow blocking plate and a mounting tab. The mounting tab is used to mount the flow blocking member on the tank body so that the flow blocking plate is fixed relative to the tank body. The flow blocking plate penetrates the second flow channel, and one end of the flow blocking plate away from the mounting tab extends into the first flow channel. Among them, the flow blocking plate divides the second flow channel into two sub-flow channels. Among the two sub-flow channels, the one closer to the first port is the first sub-flow channel, and the one farther from the first port is the second sub-flow channel.

[0007] When the pressure of the water circuit system is greater than the pressure of the expansion tank, a part of the liquid in the water circuit system enters the first flow channel through the first port, and then enters the tank body through the second flow channel. At this time, the water volume in the water circuit system decreases and the pressure decreases, while the water volume in the tank body increases and the pressure increases. Moreover, the pressure in the tank body gradually reaches equilibrium with the pressure in the water circuit system. When the pressure in the tank body and the pressure in the water circuit system reach equilibrium, or when the pressure in the tank body is slightly less than the pressure in the water circuit system, for the liquid entering the first port, a part of it flows along the first flow channel and flows out through the second port to return to the water circuit system, and another part enters the tank body along the first sub-flow channel under the action of the flow blocking plate. At the same time, a part of the liquid in the tank body flows out through the second sub-flow channel into the first flow channel and then further flows out through the second port. During this process, the liquid flowing into the tank body through the first sub-flow channel and the liquid flowing out of the tank body through the second sub-flow channel form a disturbance inside the tank body, enabling the liquid in the tank body to flow and be displaced by the newly entering liquid into the tank body. In this way, it is possible to prevent the liquid in the tank body from becoming stagnant water due to long-term non-flow, thereby avoiding the growth of bacteria and eliminating potential safety hazards.

[0008] In some embodiments, a connecting flange is provided at the bottom of the tank body, and the interface portion is connected to the bottom surface of the connecting flange; the mounting tab is located on the top surface of the connecting flange. One of the mounting tab and the connecting flange is provided with a positioning protrusion, and the other of the mounting tab and the connecting flange is provided with a groove. The positioning protrusion cooperates with the groove to limit the rotational freedom of the mounting tab relative to the connecting flange.

[0009] In some embodiments, the connecting flange is provided with a through hole, the flow blocking plate passes through the through hole, the mounting tab covers the through hole, the mounting tab is provided with a plurality of water passing holes, the water passing holes are communicated with the through hole, and the inlet and outlet flow channels are communicated with the inner cavity through the through hole and the water passing holes; among them, the total flow area of the plurality of water passing holes is smaller than the flow area of the through hole.

[0010] In some embodiments, the flow blocking plate passes through the central axis of the second flow channel; two limiting grooves are provided on the inner wall of the second flow channel, and the opposite two edges of the flow blocking plate are respectively located in a corresponding one of the limiting grooves.

[0011] In some embodiments, the interface portion is a threaded pipe, and a rotatable nut is provided at the third port, and the nut is engaged with the threaded pipe.

[0012] In some embodiments, the central axis of the first flow channel is perpendicular to the central axis of the second flow channel, and the central axis of the first flow channel is perpendicular to the flow blocking plate.

[0013] In some embodiments, the length of the flow blocking plate in the first flow channel is greater than or equal to 1 / 2 of the diameter of the first flow channel and less than or equal to the diameter of the first flow channel.

[0014] In some embodiments, the length of the flow blocking plate in the first flow channel is less than or equal to 4 / 5 of the diameter of the first flow channel.

[0015] In some embodiments, the valve assembly further includes a first stop valve and a second stop valve. The first stop valve is disposed at the first port, and the second stop valve is disposed at the second port.

[0016] In some embodiments, a third flow channel is further formed inside the main body portion. The third flow channel extends along the height direction of the tank body and is communicated with the first flow channel. The main body portion further has a fourth port, and the fourth port is located at the lower end of the third flow channel; the valve assembly further includes a drain valve disposed at the fourth port.

[0017] In a second aspect, the present application provides a unit, which includes: a liquid pipeline; and the expansion tank assembly in any of the above embodiments, and the first port and the second port are connected to the liquid pipeline.

[0018] In some embodiments, the unit is a heat pump unit, an air conditioner, a gas water heater or an electric water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of an expansion tank assembly provided by an embodiment of the present application;

[0021] Figure 2 It is a schematic diagram of the water flow direction when the expansion tank assembly provided by an embodiment of the present application is working (the arrows in the figure indicate the water flow direction);

[0022] Figure 3 Structural schematic diagram of a valve assembly and a flow blocking member provided by an embodiment of the present application;

[0023] Figure 4 Assembly schematic diagram (front view) of a valve assembly and a connecting flange provided by an embodiment of the present application;

[0024] Figure 5 Assembly schematic diagram (side view) of a valve assembly and a connecting flange provided by an embodiment of the present application;

[0025] Figure 6 Structural schematic diagram of a valve assembly provided by an embodiment of the present application;

[0026] Figure 7 Structural schematic diagram of an expansion tank assembly provided by another embodiment of the present application.

[0027] Description of reference numerals:

[0028] 10. Expansion tank assembly; 20. Liquid pipeline;

[0029] 100. Expansion tank;

[0030] 110. Tank body; 111. Inner cavity; 112. Connecting flange; 113. Groove;

[0031] 120. Interface part; 121. Inlet and outlet flow channels;

[0032] 200. Valve assembly;

[0033] 210. Main body part; 211. First port; 212. Second port; 213. Third port; 214. Fourth port; 215. First flow channel; 216. Second flow channel; 2161. Limit groove; 2162. First sub-flow channel; 2163. Second sub-flow channel; 217. Third flow channel; 218. Nut;

[0034] 220. First stop valve;

[0035] 230. Second stop valve;

[0036] 240. Drain valve;

[0037] 300. Flow blocking member;

[0038] 310. Flow blocking plate;

[0039] 320. Installation retaining piece; 321. Positioning protrusion; 322. Water passing hole. Detailed implementation manners

[0040] The principles and features of the present application will be described below in conjunction with the accompanying drawings. The examples given are only used to explain the present application and are not intended to limit the scope of the present application.

[0041] The expansion tank is a component connected to the water circuit system and can play a role in balancing the water pressure in the water circuit. Usually, the expansion tank has an inlet and outlet, which is connected to the pipeline of the water circuit system. When the pressure of the water circuit system is greater than the pressure of the expansion tank, the liquid in the water circuit system will enter the expansion tank. When the pressure of the water circuit system is less than the pressure of the expansion tank, the liquid in the expansion tank can be replenished into the pipeline of the water circuit system. In this way, the pressure fluctuation of the water circuit system can be controlled within a certain normal range.

[0042] However, when the water circuit system is working properly, the range of water pressure change is relatively small, the amount of regulated water flowing in and out of the expansion tank is not much, and the water flowing in and out of the tank each time is only replaced at the tank opening. This makes most of the water in the tank not replaced and updated and becomes stagnant water. These stagnant waters stay in the tank for a long time and are prone to breed bacteria, thus bringing potential safety hazards.

[0043] Based on the above situation, the embodiments of the first aspect of the present application provide an expansion tank assembly and a unit, aiming to improve the problem that stagnant water is likely to form in the expansion tank.

[0044] Figure 1 It is a schematic structural diagram of an expansion tank assembly provided by an embodiment of the present application. Figure 2 It is a schematic diagram of the water flow direction when the expansion tank assembly provided by an embodiment of the present application is working (the arrows in the figure indicate the water flow direction). Figure 3 It is a schematic structural diagram of a valve assembly and a flow blocking member provided by an embodiment of the present application. As Figure 1 、 Figure 2 and Figure 3As shown in the figure, the expansion tank assembly 10 in the embodiment of the present application includes an expansion tank 100, a valve assembly 200, and a flow blocking member 300. The expansion tank 100 includes a tank body 110 and an interface portion 120 provided at the bottom of the tank body 110. The tank body 110 has an inner cavity 111, and an inlet and outlet flow channel 121 is formed inside the interface portion 120. The inlet and outlet flow channel 121 is communicated with the inner cavity 111. The valve assembly 200 includes a main body portion 210. The main body portion 210 has a first port 211, a second port 212, and a third port 213. A first flow channel 215 and a second flow channel 216 communicated with the first flow channel 215 are formed inside the main body portion 210. The first port 211 and the second port 212 are located at both ends of the first flow channel 215, and the third port 213 is located at one end of the second flow channel 216. The third port 213 is connected to the interface portion 120 so that the second flow channel 216 is communicated with the inlet and outlet flow channel 121. The flow blocking member 300 includes a flow blocking plate 310 and a mounting flap 320. The mounting flap 320 is mounted on the tank body 110 and is located in the inner cavity 111. One end of the flow blocking plate 310 is fixedly connected to the mounting flap 320. The flow blocking plate 310 penetrates through the second flow channel 216 and the other end extends into the first flow channel 215.

[0045] The expansion tank 100 can be connected to the water circuit system through the valve assembly 200, so that the expansion tank 100 can balance the pressure of the water circuit system. The expansion tank 100 includes a tank body 110 and an interface portion 120. An airbag is provided inside the tank body 110, and gas is stored in the airbag. In the inner cavity 111 of the tank body 110, the space outside the airbag is a liquid storage cavity. When the pressure of the water circuit system is greater than the pressure of the expansion tank 100, the liquid in the water circuit system will enter the liquid storage cavity of the expansion tank 100. During the liquid inlet process, the gas in the airbag is compressed. When the pressure of the water circuit system is less than the pressure of the expansion tank 100, the liquid stored in the expansion tank 100 enters the water circuit system. In this way, the expansion tank 100 can adjust the pressure of the water circuit system to control the pressure fluctuation of the water circuit system within the normal range.

[0046] The valve assembly 200 is used to connect the expansion tank 100 to the water circuit system. Among them, the valve assembly 200 includes a main body portion 210. The main body portion 210 is the main structure of the valve assembly 200. The main body portion 210 can be made of materials such as stainless steel and copper, and has good structural strength. A first flow channel 215 and a second flow channel 216 are formed inside the main body portion 210. The first port 211 and the second port 212 are located at both ends of the first flow channel 215, and the third port 213 is located at the end of the second flow channel 216 far from the first flow channel 215. The third port 213 is connected to the interface portion 120. In this way, the water circuit system is communicated with the inner cavity 111 of the tank body 110 through the first flow channel 215, the second flow channel 216, and the inlet and outlet flow channel 121 inside the interface portion 120.

[0047] In the expansion tank assembly 10 in the embodiments of the present application, a flow blocking member 300 is provided. The flow blocking member 300 includes a flow blocking plate 310 and a mounting tab 320. The mounting tab 320 is used to mount the flow blocking member 300 to the tank body 110 so that the flow blocking plate 310 is fixed relative to the tank body 110. The flow blocking plate 310 penetrates through the second flow channel 216, and one end of the flow blocking plate 310 away from the mounting tab 320 extends into the first flow channel 215. Among them, the flow blocking plate 310 divides the second flow channel 216 into two sub-flow channels. Among the two sub-flow channels, the one closer to the first port 211 is the first sub-flow channel 2162, and the one farther from the first port 211 is the second sub-flow channel 2163.

[0048] When the pressure of the water circuit system is greater than the pressure of the expansion tank 100, a part of the liquid in the water circuit system enters the first flow channel 215 through the first port 211, and then enters the tank body 110 through the second flow channel 216. At this time, the amount of water in the water circuit system decreases and the pressure decreases, while the amount of water in the tank body 110 increases and the pressure increases. Moreover, the pressure in the tank body 110 gradually reaches equilibrium with the pressure in the water circuit system. When the pressure in the tank body 110 and the pressure in the water circuit system reach equilibrium, or when the pressure in the tank body 110 is slightly less than the pressure in the water circuit system, for the liquid entering the first port 211, a part of it flows along the first flow channel 215 and flows out through the second port 212 to return to the water circuit system, and another part enters the tank body 110 along the first sub-flow channel 2162 under the action of the flow blocking plate 310. At the same time, a part of the liquid in the tank body 110 flows out through the second sub-flow channel 2163 into the first flow channel 215, and then further flows out through the second port 212. During this process, the liquid flowing into the tank body 110 through the first sub-flow channel 2162 and the liquid flowing out of the tank body 110 through the second sub-flow channel 2163 form a disturbance inside the tank body 110, enabling the liquid in the tank body 110 to flow and be displaced by the newly entering liquid into the tank body 110. In this way, it is possible to prevent the liquid in the tank body 110 from becoming stagnant water due to long-term non-flow, thereby avoiding the breeding of bacteria and eliminating potential safety hazards.

[0049] Figure 4 Schematic assembly diagram (front view) of the valve assembly and the connecting flange provided by an embodiment of the present application Figure 5 Schematic assembly diagram (side view) of the valve assembly and the connecting flange provided by an embodiment of the present application. As Figure 1 、 Figure 3 、 Figure 4 and Figure 5As shown, in some embodiments, a connecting flange 112 is provided at the bottom of the tank body 110, and the interface portion 120 is connected to the bottom surface of the connecting flange 112. The mounting tab 320 is located on the top surface of the connecting flange 112. One of the mounting tab 320 and the connecting flange 112 is provided with a positioning protrusion 321, and the other of the mounting tab 320 and the connecting flange 112 is provided with a groove 113. The positioning protrusion 321 cooperates with the groove 113 to limit the rotational freedom of the mounting tab 320 relative to the tank body 110.

[0050] In a specific example, the positioning protrusion 321 is provided on the bottom surface of the mounting tab 320, and the groove 113 is provided on the top surface of the connecting flange 112. The positioning protrusion 321 of the mounting tab 320 is located in the groove 113, so that the mounting tab 320 cannot rotate relative to the tank body 110. On this basis, under the gravitational action of the baffle 310 and the mounting tab 320, the flow resistance member 300 is also fixed relative to the tank body 110 in the height direction of the tank body 110. In other examples, it may also be that the positioning protrusion 321 is provided on the top surface of the connecting flange 112, and the groove 113 is provided on the bottom surface of the mounting tab 320. The positioning protrusion 321 of the connecting flange 112 is located in the groove 113, so that the mounting tab 320 cannot rotate relative to the tank body 110.

[0051] By restricting the rotational freedom of the mounting tab 320 relative to the tank body 110 through the cooperation of the positioning protrusion 321 and the groove 113, and then using the gravity of the flow resistance member 300 to fix the flow resistance member 300 relative to the tank body 110 in the height direction of the tank body 110, thus, the assembly between the resistance member and the tank body 110 is realized. This installation method is relatively simple and easy to implement, and is also beneficial to ensuring the installation accuracy.

[0052] As Figure 3 shown, in one of the embodiments, the connecting flange 112 is provided with a through hole, the baffle 310 passes through the through hole, the mounting tab 320 covers the through hole, the mounting tab 320 is provided with a plurality of water passing holes 322, the water passing holes 322 communicate with the through hole, and the inlet and outlet flow channels 121 communicate with the inner cavity 111 of the tank body 110 through the through hole and the water passing holes 322. Among them, the total flow area of the plurality of water passing holes 322 is smaller than the flow area of the through hole.

[0053] When the pressure of the waterway system is too small, the liquid inside the tank body 110 will supplement the waterway system, and at the same time, the airbag inside the tank body 110 will expand. If the pressure of the waterway system is too low, more liquid will flow out of the tank body 110, and the degree of expansion of the airbag will also be larger. At this time, part of the structure of the airbag may squeeze into the inlet and outlet channels, thus generating the risk of blocking the inlet and outlet channels. To avoid the above risks, the installation baffle 320 is used to cover the through hole on the connecting flange 112, and at the same time, a plurality of water passing holes 322 are provided on the installation baffle 320. The total flow area of all the water passing holes 322 is smaller than the area of the through hole. That is to say, the size of each water passing hole 322 is significantly smaller than the size of the through hole. In this way, by the shielding of the installation baffle 320, it can be avoided that part of the structure of the airbag squeezes into the inlet and outlet channels when the airbag expands. Therefore, the risk of the airbag blocking the inlet and outlet channels due to part of the structure squeezing into the inlet and outlet channels can be reduced.

[0054] Figure 6 The structural schematic diagram of the valve assembly provided by an embodiment of the present application is as Figure 2 、 Figure 6 shown. In some embodiments, the flow blocking plate 310 passes through the central axis of the second flow channel 216. Two limiting grooves 2161 are provided on the inner wall of the second flow channel 216. The two opposite edges of the flow blocking plate 310 are respectively located in a corresponding limiting groove 2161.

[0055] The flow blocking plate 310 passes through the central axis of the second flow channel 216. Thus, the flow blocking plate 310 equally divides the second flow channel 216 to form a first sub-flow channel 2162 and a second sub-flow channel 2163, so that the flow areas of the first sub-flow channel 2162 and the second sub-flow channel 2163 are equal. In this way, when the pressure inside the tank body 110 and the pressure of the waterway system reach equilibrium, or when the pressure inside the tank body 110 is slightly less than the pressure of the waterway system, the flow rates of the liquid entering the tank body 110 from the first sub-flow channel 2162 and the liquid flowing out of the tank body 110 from the second sub-flow channel 2163 are the same, which is conducive to making the liquid inside the tank body 110 flow more fully, accelerating the replacement of the liquid inside the tank body 110, and reducing the probability of generating stagnant water.

[0056] On this basis, two limiting grooves 2161 are provided on the inner wall of the second flow channel 216. The two opposite edges of the flow blocking plate 310 are respectively located in the corresponding limiting grooves 2161. In this way, it is beneficial to keep the relative position of the main body part 210 of the valve assembly 200 and the flow blocking plate 310, and avoid the main body part 210 rotating relative to the tank body 110. Therefore, a stable phase position relationship can be ensured between the first flow channel 215, the second flow channel 216 and the flow blocking plate 310, and further the flow blocking plate 310 can stably play a flow blocking role.

[0057] As Figure 2 、Figure 3 As shown, further, the interface portion 120 is a threaded pipe, and a rotatable nut 218 is provided at the third port 213, and the nut 218 is engaged with the threaded pipe.

[0058] The third port 213 can be connected to the interface portion 120 through the engagement of the nut 218 with the threaded pipe. Moreover, since the nut 218 can rotate relative to the third port 213, during the process of tightening the nut 218 with the threaded pipe, the main body portion 210 of the valve assembly 200 does not rotate with the nut 218. That is to say, when connecting the valve assembly 200 to the expansion tank 100, the edge of the flow blocking plate 310 can be first inserted into the limiting groove 2161 of the second flow channel 216, and then the nut 218 is connected to the threaded pipe. During the process of tightening the nut 218, the main body portion 210 of the valve assembly 200 does not rotate, and thus no torque is formed on the flow blocking plate 310.

[0059] As Figure 2 shown, in one of the embodiments, the central axis of the first flow channel 215 is perpendicular to the central axis of the second flow channel 216, and the central axis of the first flow channel 215 is perpendicular to the flow blocking plate 310.

[0060] When the central axis of the first flow channel 215 is perpendicular to the central axis of the second flow channel 216, the processing and manufacturing of the inner flow channel of the main body portion 210 are the easiest, which is conducive to improving the manufacturing accuracy of the main body portion 210 and also conducive to improving the appearance beauty of the main body portion 210.

[0061] On this basis, the central axis of the first flow channel 215 is perpendicular to the flow blocking plate 310. In this way, it is beneficial to make the flow blocking effect of the flow blocking plate 310 reach the best, so as to further ensure the full flow of the liquid in the tank body 110 and avoid the liquid in the tank body 110 from becoming stagnant water.

[0062] As Figure 2 shown, in some embodiments, the length of the flow blocking plate 310 in the first flow channel 215 is greater than or equal to 1 / 2 of the diameter of the first flow channel 215 and less than or equal to the diameter of the first flow channel 215.

[0063] Since a part of the structure of the baffle 310 extends into the first flow channel 215, the length of the baffle 310 in the first flow channel 215 refers to the length of the part of the baffle 310 extending into the first flow channel 215. The length of the baffle 310 in the first flow channel 215 being greater than or equal to 1 / 2 of the diameter of the first flow channel 215 is conducive to ensuring that a relatively large amount of liquid in the first flow channel 215 is blocked by the baffle 310 and thus enters the first sub-flow channel 2162 under the guidance of the baffle 310, so as to ensure that enough liquid enters the tank body 110 to displace the liquid in the tank body 110. The length of the baffle 310 in the first flow channel 215 being less than or equal to the diameter of the first flow channel 215 ensures that the first flow channel 215 is not completely blocked by the baffle 310, avoiding the interruption of the pipeline connecting the valve assembly 200 in the water circuit system.

[0064] In one embodiment, the length of the baffle 310 in the first flow channel 215 is less than or equal to 4 / 5 of the diameter of the first flow channel 215. In this way, it is ensured that the first flow channel 215 is not completely blocked by the baffle 310, avoiding the interruption of the pipeline connecting the valve assembly 200 in the water circuit system.

[0065] Figure 7 The structural schematic diagram of the expansion tank assembly provided by another embodiment of the present application is as Figure 7 shown. In some embodiments, the valve assembly 200 further includes a first stop valve 220 and a second stop valve 230. The first stop valve 220 is arranged at the first port 211, and the second stop valve 230 is arranged at the second port 212. When it is necessary to inspect and maintain the expansion tank 100, the liquid flow in the first flow channel 215 can be blocked by the first stop valve 220 and the second stop valve 230, thus facilitating the inspection and maintenance of the expansion tank 100.

[0066] As Figure 2 、 Figure 7 shown. In one embodiment, a third flow channel 217 is further formed inside the main body portion 210. The third flow channel 217 extends along the height direction of the tank body 110 and is communicated with the first flow channel 215. The main body portion 210 further has a fourth port 214, and the fourth port 214 is located at the lower end of the third flow channel 217. The valve assembly 200 further includes a drain valve 240 arranged at the fourth port 214. When it is necessary to inspect and maintain the expansion tank 100, after blocking the liquid flow in the first flow channel 215 by using the first stop valve 220 and the second stop valve 230, the drain valve 240 can be further opened to drain the liquid in the expansion tank 100, and then the expansion tank 100 can be removed from the water circuit system. In this way, it can be avoided that liquid splashes during the process of removing the expansion tank 100 due to a relatively large amount of liquid stored inside the expansion tank 100.

[0067] An embodiment of the second aspect of the present application provides a unit, which includes a liquid pipeline 20 and the expansion tank assembly 10 in any of the above embodiments. Among them, the first port 211 and the second port 212 are connected to the liquid pipeline 20.

[0068] The unit in the embodiment of the present application and the expansion tank assembly 10 in the above embodiment are based on the same inventive concept. Therefore, the unit in the embodiment of the present application can obtain the beneficial effects possessed by the expansion tank assembly 10 in the above embodiment.

[0069] In some embodiments, the unit is a heat pump unit, an air conditioner, a gas water heater or an electric water heater. The temperature of the liquid pipeline 20 in the above types of units changes. Therefore, the expansion tank assembly 10 can adjust the liquid pressure change caused by the temperature change of the liquid pipeline 20 in the heat pump unit, the air conditioner, the gas water heater or the electric water heater, and at the same time can also prevent stagnant water from forming in the expansion tank 100. In this way, it is beneficial to improve the safety and reliability of the above units.

[0070] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0071] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0072] In the present application, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0073] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0074] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without conflict, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0075] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. An expansion tank assembly, characterized in that, Comprising: An expansion tank, including a tank body and an interface part arranged at the bottom of the tank body. The tank body has an inner cavity, and an inlet and outlet flow channel is formed inside the interface part. The inlet and outlet flow channel is communicated with the inner cavity; A valve assembly, including a main body part. The main body part has a first port, a second port and a third port. A first flow channel and a second flow channel communicated with the first flow channel are formed inside the main body part. The first port and the second port are located at both ends of the first flow channel. The third port is located at one end of the second flow channel. The third port is connected to the interface part so that the second flow channel is communicated with the inlet and outlet flow channel; and A flow blocking member, including a flow blocking plate and a mounting tab. The mounting tab is mounted on the tank body and is located in the inner cavity. One end of the flow blocking plate is fixedly connected to the mounting tab. The flow blocking plate penetrates through the second flow channel and the other end extends into the first flow channel.

2. The expansion tank assembly according to claim 1, wherein A connecting flange is arranged at the bottom of the tank body. The interface part is connected to the bottom surface of the connecting flange; The mounting tab is located on the top surface of the connecting flange. One of the mounting tab and the connecting flange is provided with a positioning protrusion, and the other of the mounting tab and the connecting flange is provided with a groove. The positioning protrusion cooperates with the groove to limit the rotational freedom of the mounting tab relative to the tank body.

3. The expansion tank assembly according to claim 2, wherein, The connecting flange is provided with a through hole. The flow blocking plate passes through the through hole. The mounting tab covers the through hole. The mounting tab is provided with a plurality of water passing holes. The water passing holes are communicated with the through hole. The inlet and outlet flow channel is communicated with the inner cavity through the through hole and the water passing holes; Wherein, the total flow area of the plurality of water passing holes is smaller than the flow area of the through hole.

4. The expansion tank assembly according to claim 1, characterized in that, The flow blocking plate passes through the central axis of the second flow channel; Two limiting grooves are arranged on the inner wall of the second flow channel. The opposite two edges of the flow blocking plate are respectively located in a corresponding one of the limiting grooves.

5. The expansion tank assembly according to claim 4, wherein, The interface part is a threaded pipe. A rotatable nut is arranged at the third port. The nut cooperates with the threaded pipe.

6. The expansion tank assembly according to claim 4, wherein, The central axis of the first flow channel is perpendicular to the central axis of the second flow channel. The central axis of the first flow channel is perpendicular to the flow blocking plate.

7. The expansion tank assembly according to claim 1, wherein, The length of the flow blocking plate in the first flow channel is greater than or equal to 1 / 2 of the diameter of the first flow channel and less than or equal to the diameter of the first flow channel.

8. The expansion tank assembly according to claim 7, wherein The length of the flow blocking plate in the first flow channel is less than or equal to 4 / 5 of the diameter of the first flow channel.

9. The expansion tank assembly according to claim 1, characterized in that, The valve assembly further includes a first stop valve and a second stop valve. The first stop valve is arranged at the first port. The second stop valve is arranged at the second port.

10. The expansion tank assembly according to claim 9, characterized in that, A third flow channel is further formed inside the main body part. The third flow channel extends along the height direction of the tank body and is communicated with the first flow channel. The main body part further has a fourth port. The fourth port is located at the lower end of the third flow channel; The valve assembly further includes a drain valve arranged at the fourth port.

11. A unit, characterized in that, Comprising: A liquid pipeline; And An expansion tank assembly according to any one of claims 1 to 10, wherein the first port and the second port are connected to the liquid pipeline.

12. The unit according to claim 11, characterized in that, The unit is a heat pump unit, an air conditioner, a gas water heater or an electric water heater.

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