Water tank cover, expansion water tank and vehicle

Abstract

The utility model discloses a water tank cover, an expansion water tank and a vehicle, and the water tank cover comprises a cover body, the gas filtering device is arranged in the concave cavity, and a plurality of first gas holes communicated with the atmosphere are uniformly formed in the periphery of the gas filtering device; the upper cover is arranged above the concave cavity and is in sealing connection with the cover body; the valve assembly is arranged at the lower part of the cover body; an air channel is formed in the valve assembly and comprises an air inlet channel and an air outlet channel, and the two ends of the air outlet channel and the two ends of the air inlet channel communicate with the cavity and the water tank correspondingly. The water tank cover is simple in overall structure, few in parts and easy to assemble, the failure rate of the tank cover is reduced, and the service life of the tank cover is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of cooling systems for new energy vehicles, and in particular relates to a water tank cover, an expansion water tank and a vehicle. Background Art

[0002] The expansion tank is used to discharge the gas in the vehicle cooling system and provide antifreeze to the cooling system accordingly. By increasing the pressure of the cooling system, the pressure of the water pump is increased, and the harm of water pump cavitation is also avoided. The expansion tank cap is used in conjunction with the expansion tank to achieve high-pressure exhaust and low-pressure air replenishment of the expansion tank, so that the cooling system always maintains a relatively stable pressure.

[0003] The existing expansion tank cover can relieve or replenish the pressure of the gas in the tank, but because the pressure relief and pressure replenishment are achieved in the same gas channel, there are more parts in the gas channel, the connection structure is complex, the assembly is difficult, it is more prone to failure, and the stability is poor. Utility Model Content

[0004] The utility model aims to provide a water tank cover, which splits the two functions of pressure relief and pressure replenishment into two channels for implementation, simplifies the structure in the channels, and prolongs the service life of the water tank cover.

[0005] The specific contents of the plan are as follows:

[0006] In a first aspect, the utility model discloses a water tank cover, comprising:

[0007] A cover body; a concave cavity is provided on the upper portion of the cover body;

[0008] A gas filter device, the gas filter device is placed in the concave cavity, and a plurality of first air holes connected to the atmosphere are evenly arranged on the periphery of the gas filter device;

[0009] An upper cover, which is disposed above the concave cavity and is sealed and connected to the cover body;

[0010] A valve assembly, wherein the valve assembly is arranged at the lower part of the cover body;

[0011] An air passage is arranged inside the valve assembly, and the air passage includes an air outlet passage and an air inlet passage, and both ends of the air outlet passage and the air inlet passage are respectively connected to the concave cavity and the water tank.

[0012] Preferably, a hollow air outlet boss and an air outlet valve are provided in the air outlet channel, the hollow air outlet boss abuts against one end of the air outlet channel connected to the concave cavity, the air outlet valve abuts against one end of the air outlet channel connected to the water tank in a sealed manner, and a first compression spring is connected between the hollow air outlet boss and the air outlet valve;

[0013] An air intake hollow boss and an air intake valve are provided in the air intake channel. The air intake hollow boss abuts against one end of the air intake channel connected to the water tank. The air intake valve seals against one end of the air intake channel connected to the concave cavity. A second compression spring is connected between the air intake hollow boss and the air intake valve.

[0014] Preferably, the air inlet valve and the air outlet valve both include:

[0015] A valve body, wherein the valve body is a hollow conical structure, and the conical structure is surrounded by a circular bottom plate and a sealing cone surface, and the sealing cone surface seals against the air inlet channel and the air outlet channel;

[0016] Guide blocks, the guide blocks are evenly arranged on the circular bottom plate along the circumferential direction; vent holes are formed between two adjacent guide blocks and the inner wall surface of the airway;

[0017] A positioning platform is arranged on one end of the circular bottom plate away from the sealing cone surface, and the positioning platform is connected to the first compression spring and the second compression spring.

[0018] In the second aspect, the utility model records a vehicle expansion water tank, including a water tank body, wherein a first tank body and a second tank body are arranged inside the water tank body, a first cover body is installed on the top of the first tank body, and the above-mentioned water tank cover body is installed on the top of the second tank body.

[0019] Preferably, the first cover body comprises:

[0020] A first cover body;

[0021] A ventilation cavity, the ventilation cavity is arranged at the lower part of the first cover body;

[0022] The ventilation cavity is surrounded by the first cover body, the ventilation cavity bottom plate and the ventilation cavity side plate, and a first filter element is arranged inside the ventilation cavity;

[0023] A plurality of ventilation holes are provided on the bottom plate of the ventilation cavity, and the bottom of the first filter element is arranged on the bottom plate of the ventilation cavity;

[0024] A plurality of second air holes connected to the atmosphere are evenly arranged on the side plate of the ventilation cavity.

[0025] Preferably, a plurality of oil-gas separation channels are further provided inside the valve assembly, one end of the oil-gas separation channel is connected to an end of the air passage away from the concave cavity, and the other end is connected to the inside of the second box;

[0026] The oil-gas separation passage is provided with oil-gas separation cotton and a through-hole pressing plate. The through-hole pressing plate is arranged between the oil-gas separation cotton and the second box body and abuts against the oil-gas separation cotton.

[0027] Preferably, the vehicle expansion water tank also includes a degassing port arranged on the side of the first tank body, and the degassing port includes a first degassing port and a second degassing port, the first degassing port is connected to the degassing end of the fuel-electric engine cooling system, and the second degassing port is connected to the degassing end of the fuel-electric engine accessory cooling system.

[0028] In a third aspect, the utility model describes a vehicle, comprising the above-mentioned vehicle expansion water tank.

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] 1. The air outlet channel of the water tank cover of the utility model realizes pressure relief by arranging an air outlet hollow boss, a first compression spring and an air outlet valve, and realizes pressure replenishment by arranging an air inlet hollow boss, a second compression spring and an air inlet valve. The water tank cover has a simple structure, a reduced number of parts and components, and is easy to assemble, thereby reducing the failure rate of the cover body and extending the service life of the cover body.

[0031] 2. The air inlet valve and the air outlet valve of the water tank cover of the utility model have a hollow conical structure, which ensures that the air inlet valve and the air outlet valve can bear pressure accurately, so that the pressure values ​​when the air outlet valve opens and closes the air outlet channel and the air inlet valve opens and closes the air inlet channel are more accurate; the air inlet valve and the air outlet valve are provided with a guide block, and a vent is formed between the guide block and the inner wall of the airway to ensure that the conical structure is evenly stressed, so that the spring can be evenly stressed when it is deformed, avoiding damage to the spring.

[0032] 3. The expansion water tank of the utility model is provided with a first tank body for containing coolant to cool the fuel-electric engine and fuel-electric engine accessories, and a second tank body for containing diesel to provide fuel for the independent heating system of the cab. There is no need to set up a separate diesel tank and fuel tank accessories, and it is easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a front view of the water tank cover of the utility model;

[0034] Figure 2 It is a top view of the water tank cover of the utility model;

[0035] Figure 3 It is a side view of the water tank cover of the utility model;

[0036] Figure 4 for Figure 2 AA section view;

[0037] Figure 5 for Figure 3 BB section view;

[0038] Figure 6 for Figure 3CC section view;

[0039] Figure 7 It is a cross-sectional view of the air outlet valve and the air inlet valve of the water tank cover of the utility model;

[0040] Figure 8 It is a top view of the air outlet valve and the air inlet valve of the water tank cover of the utility model;

[0041] Fig. 9 It is a front view of the expansion water tank of the utility model;

[0042] Fig.10 It is a top view of the expansion water tank of the utility model;

[0043] Fig.11 It is a top view of the first cover of the expansion water tank of the utility model;

[0044] Fig.12 It is a cross-sectional view of a first cover body of an expansion water tank of the utility model;

[0045] In the figure:

[0046] 1. Water tank body; 11. First tank body; 12. Second tank body; 13. Partition plate;

[0047] 2. Cover assembly; 21. First cover; 211. First filter element; 212. Inner cavity; 213. Outer cavity; 214. Ventilation cavity bottom plate; 2131. Second air hole;

[0048] 22. Water tank cover; 221. Cover body; 222. Concave cavity; 2221. First air hole; 223. Gas filter device; 224. Upper cover; 225. Dust cap; 226. Valve assembly; 227. Air outlet channel; 228. Air inlet channel; 2271. Air outlet valve; 2272. First compression spring; 2273. Air outlet hollow boss; 2281. Air inlet valve; 2282. Second compression spring; 2283. Air inlet hollow boss; 229. Oil-gas separation cotton; 2291. Through-hole pressure plate; 22-1. Sealing cone; 22-2. Circular bottom plate; 22-3. Guide block; 22-4. Air vent; 22-5. Positioning platform;

[0049] 3. Degassing port; 31. First degassing port; 32. Second degassing port; 4. Oil absorber; 5. Water supply port; 51. First water supply port; 52. Second water supply port. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0051] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0052] It should be noted that the directions or positional relationships indicated by the terms "front", "rear", "inside" and "outside" in the present invention are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0053] It should be particularly noted that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0054] Embodiment 1:

[0055] See also Figure 1-6 As shown, a water tank cover 22 provided in an embodiment of the present application includes: a cover body 221; a concave cavity 222 is provided on the upper part of the cover body 221; a gas filter device 223, the gas filter device 223 is installed in the concave cavity 222, and 6 L-shaped first air holes 2221 connected to the atmosphere are evenly arranged on the outer periphery of the gas filter device 223, and the gas filter device 223 filters out impurities in the outside air to ensure the cleanliness of the second box body 12; an upper cover 224, the upper cover 224 is arranged above the concave cavity 222, and is sealed and screwed with the cover body 221, and the upper part of the upper cover 224 is clamped with the dust cap 225; a valve assembly 226, the valve assembly 226 is sealed and screwed at the lower part of the cover body 221; an airway is provided inside the valve assembly 226, and the airway includes an air outlet channel 227 and an air inlet channel 228, and both ends of the air outlet channel 227 and the air inlet channel 228 are respectively connected to the concave cavity 222 and the water tank. The air outlet channel is used for pressure relief, and the air inlet channel is used for pressure replenishment. The water tank cover body has fewer parts and components and is easy to assemble, which reduces the failure rate of the cover body and prolongs the service life of the cover body.

[0056] The air outlet channel 227 is provided with an air outlet hollow boss 2273 and an air outlet valve 2271. The air outlet hollow boss 2273 is installed at one end of the air outlet channel 227 communicating with the concave cavity 222. The air outlet valve 2271 is sealed and abutted against one end of the air outlet channel 227 communicating with the water tank. A first compression spring 2272 is clamped between the air outlet hollow boss 2273 and the air outlet valve 2271.

[0057] An air intake hollow boss 2283 and an air intake valve 2281 are provided in the air intake channel 228. The air intake hollow boss 2283 is installed at one end of the air intake channel 228 connected to the water tank. The air intake valve 2281 is sealed and abutted against one end of the air intake channel 228 connected to the concave cavity 222. A second compression spring 2282 is clamped between the air intake hollow boss 2283 and the air intake valve 2281. The components provided in the air intake channel and the air outlet channel are the same, and the difference lies in the installation direction and the elastic force parameters of the first compression spring 2272 and the second compression spring 2282, which reduces the types of parts and facilitates production, assembly and maintenance.

[0058] See also Figure 7 , Figure 8 As shown, the air inlet valve 2281 and the air outlet valve 2271 both include:

[0059] The valve body is a hollow conical structure, which is surrounded by a circular bottom plate 22-2 and a sealing cone surface 22-1, and the sealing cone surface 22-1 seals against the air inlet channel 228 and the air outlet channel 227;

[0060] There are six guide blocks 22-3, which are evenly arranged on the circular bottom plate 22-2 along the circumferential direction; air vents 22-4 are formed between two adjacent guide blocks 22-3 and the inner wall surface of the airway; the guide blocks 22-3 and the air vents 22-4 enable the gas to flow evenly through the inlet valve and the outlet valve, ensuring that the first compression spring 2272 and the second compression spring 2282 can be evenly stressed and deformed, and are not easily damaged.

[0061] The positioning platform 22-5 is arranged on one end of the circular bottom plate 22-2 away from the sealing cone surface 22-1. The positioning platform 22-5 is clamped with the first compression spring 2272 and the second compression spring 2282, thereby realizing the connection between the valve body and the compression spring.

[0062] Working principle:

[0063] When the gas pressure in the box is equal to the set value, the gas outlet valve 2271 and the gas inlet valve 2281 are both sealed against the gas outlet channel 227 and the gas inlet channel 228 to ensure that the box is not connected to the outside.

[0064] When the gas pressure in the box is lower than the set value, the pressure exerted by the external gas on the circular bottom plate 22-2 of the intake valve 2281 is greater than the pressure required for the second compression spring 2282 to deform. The second compression spring 2282 is compressed to cause a gap to appear between the sealing cone surface 22-1 of the intake valve 2281 and the intake channel 228, and the intake channel is opened. The external air flows into the intake channel 228 after passing through the first air hole 2221, the gas filter device 223, and the concave cavity 222, and then enters the box after passing through the gap between the intake valve 2281 and the intake channel 228, the air vent 22-4, the gap between the second compression spring 2282 and the inner wall of the intake channel, and the intake hollow boss 2283. When the gas pressure in the box reaches the set value, the intake valve 2281 is re-adapted to the intake channel 228 under the action of the second compression spring 2282, thereby closing the intake channel 228.

[0065] When the gas pressure in the box is higher than the set value, the pressure applied by the internal gas on the circular bottom plate 22-2 of the outlet valve 2271 is greater than the pressure required for the first compression spring 2272 to deform. The first compression spring 2272 is compressed to cause a gap to appear between the sealing cone surface 22-1 of the outlet valve 2271 and the outlet channel 227. The outlet channel is opened, and the internal gas enters the concave cavity through the gap between the outlet valve 2271 and the outlet channel 227, the air vent 22-4, the gap between the first compression spring 2272 and the inner wall of the outlet channel, and the outlet hollow boss 2273, and is finally discharged into the atmosphere through the gas filter device 223 and the first air hole 2221.

[0066] When the gas pressure in the box reaches a set value, the gas outlet valve 2271 abuts against the gas outlet channel 227 again under the action of the first compression spring 2272 , thereby closing the gas outlet channel 227 .

[0067] Embodiment 2:

[0068] See also Fig. 9 , Fig.10 As shown, a vehicle expansion water tank includes a water tank body 1 and a cover assembly 2. The water tank body 1 is provided with a first tank body 11 and a second tank body 12. The cover assembly 2 includes a first cover body 21 and a water tank cover body 22. The first cover body 21 is threadedly installed on the top of the first tank body 11, and the water tank cover body 22 is threadedly installed on the top of the second tank body 12. The first tank body 11 is used to hold coolant to cool the fuel-electric engine and fuel-electric engine accessories, and the second tank body 12 is used to hold diesel to provide fuel for the independent heating system in the cab. The first cover body 21 is used to open and close the first tank body 11, and the water tank cover body 22 is used to open and close the second tank body 12.

[0069] See also Fig.11 , Fig.12As shown, the first cover body 21 includes: a first cover body; a ventilation chamber, which is arranged at the lower part of the first cover body; the ventilation chamber is surrounded by the first cover body, the ventilation chamber bottom plate and the ventilation chamber side plate, and a first filter element 211 is arranged inside the ventilation chamber. The first filter element 211 is a cylindrical structure, and an inner cavity 212 is arranged inside. The gap between the first filter element 212 and the ventilation chamber side plate forms an outer cavity 213; a plurality of ventilation holes 2141 are provided on the ventilation chamber bottom plate, and the bottom of the first filter element 211 is arranged on the ventilation chamber bottom plate 214; 6 second air holes 2131 connected to the atmosphere are evenly arranged on the ventilation chamber side plate, and when the gas flows between the inner cavity 212 and the outer cavity 213 under the action of the pressure difference between the first box body and the external atmosphere, the impurities in the gas are filtered and removed by the first filter element.

[0070] See also Figure 3 , Figure 5 , Figure 6 As shown, two L-shaped oil-gas separation channels are also provided inside the valve assembly 226, one end of the oil-gas separation channel is connected to the end of the airway away from the concave cavity 222, and the other end is connected to the inside of the second box body 12;

[0071] An oil-gas separation cotton 229 and a through-hole pressure plate 2291 are provided inside the horizontal airway section of the oil-gas separation channel. The oil-gas separation cotton 229 can separate the diesel in the oil-gas mixture. The through-hole pressure plate 2291 is between the oil-gas separation cotton 229 and the second box body 12 and abuts against the oil-gas separation cotton 229. A through hole is provided on the through-hole pressure plate 2291, and the through hole can allow gas to pass through.

[0072] See also Fig.10 As shown, a vehicle expansion water tank also includes a degassing port 3 arranged at the side of the first tank body 11, and the degassing port 3 includes a first degassing port 31 and a second degassing port 32. The first degassing port 31 is connected to the degassing end of the fuel-electric engine cooling system, and the second degassing port 32 is connected to the degassing end of the fuel-electric engine accessory cooling system. The air in the fuel-electric engine cooling system and the fuel-electric engine accessory cooling system can enter the first tank body 11, and the impurities are removed by the first filter element 211 inside the first cover body 21 before being discharged.

[0073] For further information, see Fig. 9 As shown, a partition 13 is provided between the first box body 11 and the second box body 12, and the partition 13 divides the first box body 11 and the second box body 12 into two completely independent boxes.

[0074] For further information, see Fig. 9 As shown, a water filling port 5 is provided at the bottom of the first box body 11, and the water filling port 5 includes a first water filling port 51 and a second water filling port 52. The first water filling port 51 is connected to the pipeline of the fuel-electric engine cooling system, and the second water filling port 52 is connected to the pipeline of the fuel-electric engine accessory cooling system. The water filling port 5 can add liquid and replenish liquid for the fuel-electric engine and the fuel-electric engine accessories.

[0075] For further information, see Fig. 9 As shown, an oil absorber 4 is installed on the upper part of the second box body 12, and the oil absorber 4 is connected to the oil supply pipeline of the independent heating system. When the independent heating system is turned on, the diesel in the second box body 12 enters the independent heating system through the oil absorber 4 to realize oil supply.

[0076] The vehicle expansion water tank of the utility model integrates a first tank body for holding coolant and a second tank body for holding diesel, and separates the two by a partition. Then, an oil absorber is arranged on the oil tank, so that there is no need to arrange a separate diesel tank and oil tank accessories, and it is easy to assemble. In addition, the first tank body is connected to the degassing end of the fuel-electric engine cooling system and the fuel-electric engine accessory cooling system, and the air in the cooling system can enter the first tank body, and be discharged after the impurities are removed by the first filter element 211, so as to avoid polluting the environment.

[0077] Embodiment 3:

[0078] A vehicle, comprising the above-mentioned vehicle expansion water tank, does not need to be provided with a separate diesel tank and oil tank accessories, thus reducing assembly difficulty and production cost.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water tank cover (22), characterized in that: include: A cover body (221); a concave cavity (222) is provided on the upper portion of the cover body (221); A gas filter device (223), the gas filter device (223) being placed in the concave cavity (222), and a plurality of first air holes (2221) communicating with the atmosphere being evenly arranged on the periphery of the gas filter device (223); An upper cover (224), the upper cover (224) being disposed above the concave cavity (222) and being sealed and connected to the cover body (221); A valve assembly (226), wherein the valve assembly (226) is arranged at the lower part of the cover body (221); An air passage is provided inside the valve assembly (226), and the air passage comprises an air outlet passage (227) and an air inlet passage (228), and both ends of the air outlet passage (227) and the air inlet passage (228) are respectively connected to the concave cavity (222) and the water tank.

2. The water tank cover (22) according to claim 1, characterized in that: The air outlet channel (227) is provided with an air outlet hollow boss (2273) and an air outlet valve (2271); the air outlet hollow boss (2273) is in contact with one end of the air outlet channel (227) communicating with the concave cavity (222); the air outlet valve (2271) is in sealing contact with one end of the air outlet channel (227) communicating with the water tank; a first compression spring (2272) is connected between the air outlet hollow boss (2273) and the air outlet valve (2271); The air intake channel (228) is provided with an air intake hollow boss (2283) and an air intake valve (2281); the air intake hollow boss (2283) is in abutment with one end of the air intake channel (228) connected to the water tank; the air intake valve (2281) is in sealing abutment with one end of the air intake channel (228) connected to the concave cavity (222); a second compression spring (2282) is connected between the air intake hollow boss (2283) and the air intake valve (2281).

3. The water tank cover (22) according to claim 2, characterized in that: The air inlet valve (2281) and the air outlet valve (2271) both include: A valve body, wherein the valve body is a hollow conical structure, the conical structure is surrounded by a circular bottom plate (22-2) and a sealing conical surface (22-1), and the sealing conical surface (22-1) is sealingly abutted against the air inlet channel (228) and the air outlet channel (227); Guide blocks (22-3), the guide blocks (22-3) being evenly arranged on the circular bottom plate (22-2) along the circumferential direction; air holes (22-4) are formed between two adjacent guide blocks (22-3) and the inner wall surface of the airway; A positioning platform (22-5), wherein the positioning platform (22-5) is arranged on an end of the circular bottom plate (22-2) away from the sealing cone surface (22-1), and the positioning platform (22-5) is connected to the first compression spring (2272) and the second compression spring (2282).

4. A vehicle expansion water tank, characterized in that: It comprises a water tank body (1), wherein a first tank body (11) and a second tank body (12) are arranged inside the water tank body (1), a first cover body (21) is installed on the top of the first tank body (11), and a water tank cover body (22) as described in any one of claims 1 to 3 is installed on the top of the second tank body (12).

5. The vehicle expansion water tank according to claim 4, characterized in that: The first cover body (21) comprises: A first cover body; A ventilation cavity, the ventilation cavity is arranged at the lower part of the first cover body; The ventilation cavity is surrounded by the first cover body, the ventilation cavity bottom plate and the ventilation cavity side plates, and a first filter element (211) is provided inside the ventilation cavity; A plurality of ventilation holes (2141) are provided on the bottom plate of the ventilation chamber, and the bottom of the first filter element (211) is arranged on the bottom plate (214) of the ventilation chamber; A plurality of second air holes (2131) communicating with the atmosphere are evenly arranged on the side plate of the ventilation cavity.

6. The vehicle expansion water tank according to claim 4, characterized in that: The valve assembly (226) is also provided with a plurality of oil-gas separation channels, one end of the oil-gas separation channel is connected to an end of the air passage away from the concave cavity (222), and the other end is connected to the interior of the second box (12); The oil-gas separation channel is provided with oil-gas separation cotton (229) and a through-hole pressing plate (2291); the through-hole pressing plate (2291) is arranged between the oil-gas separation cotton (229) and the second box body (12), and is in contact with the oil-gas separation cotton (229).

7. The vehicle expansion water tank according to claim 4, characterized in that: The invention also comprises a degassing port (3) arranged on the side of the first box body (11), wherein the degassing port (3) comprises a first degassing port (31) and a second degassing port (32), wherein the first degassing port (31) is connected to a degassing end of a cooling system of a fuel-electric engine, and the second degassing port (32) is connected to a degassing end of a cooling system of an accessory of the fuel-electric engine.

8. A vehicle, characterized in that: Including a vehicle expansion water tank as described in any one of claims 4-7.

Images