A zero cold water mixing device

Abstract

The present invention relates to a zero-cold water mixing device, comprising a water outlet pipe, wherein the water outlet pipe has a first water inlet and a second water inlet and a water outlet arranged at intervals; the first water inlet is connected to a hot water pipe, and the second water inlet is connected to a cold water pipe; the device is characterized in that it also includes a bypass pipe connected between the cold water pipe and the water inlet pipe, wherein a one-way valve is arranged in the bypass pipe; a first valve is arranged on the first water inlet; a second valve is arranged between the hot water pipe and the bypass pipe; a temperature sensing drive device is connected between the first valve and the second valve, and when the water temperature in the hot water pipe reaches a set temperature, the first valve is opened and the second valve is closed; when the water temperature in the hot water pipe is lower than the set temperature, the first valve is closed and the second valve is opened.

Description

Technical Field

[0001] The invention relates to the field of water heaters, and in particular to a zero cold water structure of a water heater. Background Art

[0002] At present, there are many water heaters with zero cold water function on the market. The way to achieve zero cold water in this water heater is to install a circulating water pump inside the water heater. When the user does not use hot water, when the water temperature in the pipeline drops to a certain temperature, the water pump starts to let the cold water in the pipeline flow through the water heater, thereby achieving the purpose of preheating the water in the pipeline, and finally allowing the user to immediately flow out warm water when turning on the faucet, realizing the zero cold water function.

[0003] For heating and bathing dual-purpose furnaces, in order to achieve zero cold water for bathing water, the current main method is to install a circulating water pump in the bathing water circuit. A big disadvantage of this is that there will be two water pumps in the machine, one heating circulating water pump and one bathing circulating water pump, resulting in high equipment investment and high energy consumption. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a zero cold water mixing device which realizes the zero cold water function by changing the pipeline structure in view of the current status of the prior art, thereby reducing equipment investment, saving energy and reducing consumption.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: the zero cold water mixing device comprises a water outlet pipe, the water outlet pipe has a first water inlet and a second water inlet and a water outlet arranged at intervals; the first water inlet is connected to a hot water pipe, and the second water inlet is connected to a cold water pipe;

[0006] The invention is characterized in that it also includes:

[0007] A bypass pipe connected between the cold water pipe and the water inlet pipe, wherein a one-way valve is provided in the bypass pipe to limit the water flow from the hot water pipe to the cold water pipe;

[0008] a first valve, disposed on the first water inlet, for opening or closing the first water inlet;

[0009] A second valve is disposed between the hot water pipe and the bypass pipe, and is used to open or close the bypass pipe;

[0010] The temperature sensing driving device is connected between the first valve and the second valve, and operates with the change of water temperature. When the water temperature in the hot water pipe reaches the set temperature, the first valve is opened and the second valve is closed; when the water temperature in the hot water pipe is lower than the set temperature, the first valve is closed and the second valve is opened.

[0011] Preferably, the first valve may include a valve plate stopped on the first water inlet, and a first elastic member;

[0012] One end of the valve plate is rotatably limited on the inner wall of the hot water pipe, and the other end is connected to the first elastic member;

[0013] The first elastic member is connected to the temperature sensing driving device.

[0014] In order to facilitate the smooth movement of the valve plate, the portion of the inner wall of the hot water pipe corresponding to the other end of the valve plate is an arc-shaped structure.

[0015] Preferably, the second valve may include a piston capable of radially moving in the bypass pipe or on the bypass pipe port, and a second elastic member;

[0016] The second elastic member abuts between the piston and the temperature-sensing drive device;

[0017] The temperature sensing driving device is drivingly connected to the piston.

[0018] The temperature sensing driving device in the above schemes can have a variety of structures. Preferably, the temperature sensing driving device can include a heat-conducting shell, a first capsule is arranged in the shell, and the first capsule is filled with paraffin; one end of the shell is drivingly connected to the piston, and the other end of the shell is connected to the second capsule, and the second capsule is accommodated in a limiting groove, and the limiting groove is arranged on the inner wall of the hot water pipe;

[0019] The lower port of the shell is open; correspondingly, the second capsule is provided with a through hole so that the first capsule can pass through the through hole and be partially accommodated in the second capsule;

[0020] A push rod is arranged in the second bladder body, and the push rod abuts against the first bladder body and can pass through the through hole.

[0021] In order to facilitate driving the housing and the first elastic member, a push plate may be connected to the outer wall of the second capsule; the push plate is provided with a through hole corresponding to the through hole;

[0022] The lower port of the housing is connected to the push plate;

[0023] The other end of the first elastic member is connected to the push plate.

[0024] Furthermore, the push rod may be connected to a base, and the base is accommodated in the second capsule.

[0025] In order to make the action of the driving device more sensitive, the shell can be a copper tube.

[0026] Furthermore, the piston may be a copper piston.

[0027] Compared with the prior art, the zero-cold water mixing device provided by the present invention drives the first valve and the second valve to move by a temperature-sensing drive device, thereby changing the water flow direction in the pipeline, thereby obtaining a zero-cold water function, avoiding the use of a circulating pump, having low equipment investment, and having good energy-saving and consumption-reducing effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a longitudinal cross-sectional view of an embodiment of the present invention (the first valve is closed and the second valve is opened);

[0029] Figure 2 A longitudinal cross-sectional view of an embodiment of the present invention (the first valve is closed and the second valve is half-closed);

[0030] Figure 3 A longitudinal cross-sectional view of an embodiment of the present invention (the first valve is open and the second valve is closed);

[0031] Figure 4 It is a cross-sectional view of the temperature sensing drive device in the embodiment of the present invention (cold water state);

[0032] Figure 5 2 is a cross-sectional view of a temperature sensing drive device in an embodiment of the present invention (hot water state). DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings.

[0034] like Figures 1 to 5 As shown, the zero-cold water mixing device comprises:

[0035] A water outlet pipe 1, on which a first water inlet 11, a second water inlet 12 and a water outlet 13 are arranged at intervals;

[0036] The hot water pipe 2 , which is a pipe through which hot water heated by the water heater circulates, is connected to the first water inlet 11 .

[0037] The cold water pipe 3 is a cold water circulation pipe connected to the second water inlet 12, and is used to deliver the cold water in the tap water pipe (not shown in the figure) into the water outlet pipe, mix with the hot water in the water outlet pipe, and discharge the water flow of the set temperature from the water outlet 13.

[0038] The bypass pipe 4 is connected between the cold water pipe 3 and the water inlet pipe 2, and is used to send the water in the hot water pipe to the cold water pipe for circulation via the bypass pipe 4 when the water temperature in the hot water pipe does not reach the set temperature; a one-way valve 5 is provided in the bypass pipe 4 to limit the water flow from the hot water pipe 2 to the cold water pipe 3.

[0039] The one-way valve 5 can be any one of the existing ones as required.

[0040] The first valve 6 is disposed on the first water inlet 11 and is used to open or close the first water inlet 11. In this embodiment, the first valve 6 includes a valve plate 61 stopped on the first water inlet 11 and a first elastic member 62.

[0041] One end of the valve plate 61 is hinged on the inner wall of the hot water pipe 2, the other end of the valve plate 61 is connected to one end of the first elastic member 62, and the other end of the first elastic member 72 is connected to the push plate 85 of the temperature sensing drive device.

[0042] The first elastic member 62 in this embodiment is a spring. When the valve plate 61 closes the first water inlet 11, the first elastic member 62 is in a free state, and when the valve plate 61 opens the first water inlet 11, the first elastic member 62 is in a compressed state.

[0043] The second valve 7 is arranged between the hot water pipe 2 and the bypass pipe 4, and is used to connect the hot water pipe and the bypass pipe, or cut off the connection between the hot water pipe and the bypass pipe 4; the second valve 7 in this embodiment includes a piston 71 accommodated in the hot water pipe 2 and capable of radially moving on the port of the bypass pipe 4, and a second elastic member 72 for resetting the piston 71.

[0044] One end of the second elastic member 72 is connected to the piston 71 , and the other end thereof abuts against the temperature sensing driving device 8 .

[0045] The second elastic member 72 in this embodiment is a spring, which is sleeved on the copper tube, one end of which is connected to the piston 71, and the other end of which is in contact with the push plate 85 of the temperature sensing drive device.

[0046] The piston 71 in this embodiment is a copper piston to facilitate heat transfer.

[0047] The temperature sensing driving device 8 is connected between the first valve 6 and the second valve 7, and operates with the change of water temperature. When the water temperature in the hot water pipe 2 reaches the set temperature, the first valve 6 is opened and the second valve 7 is closed; when the water temperature in the hot water pipe 2 is lower than the set temperature, the first valve 6 is closed and the second valve 7 is opened. It includes:

[0048] The shell 81 is made of heat-conducting material, and in this embodiment is a hollow copper tube with one end closed and the other end open; the upper end of the heat-conducting shell 81, i.e., the closed end, is drivingly connected to the piston 71 and exposed to the piston 71 to facilitate sensing the water temperature in the hot water pipe 2; the lower end of the shell, i.e., the open end, is connected to the push plate 85.

[0049] The first capsule 82 is accommodated in the inner cavity of the copper tube and is filled with paraffin 83 . The thermal expansion of the paraffin is used to change the shape of the first capsule 82 .

[0050] The second capsule 86 is arranged below the shell 81 and accommodated in the limiting groove 84, which is arranged on the inner wall of the hot water pipe; the push plate 85 is connected to the outer surface of the second capsule 86, and the push plate and the second capsule 86 are provided with a through hole 89 connecting the inner cavity of the shell and the inner cavity of the second capsule, so that the first capsule in the copper tube can pass through the through hole 89 and be accommodated in the second capsule 86.

[0051] The push rod 87 is arranged on the base 88. The base 88 and the push rod 87 are both accommodated in the second capsule 86. The upper end of the push rod 87 is open to the lower end of the copper tube.

[0052] The working principle of the zero-cold water mixing device is described as follows:

[0053] When the water heater is not started, cold water remains in the pipe. Due to the low water temperature, the paraffin in the copper pipe shrinks at low temperature, and the piston is accommodated in the hot water pipe under the action of its own gravity and the second elastic member, and does not extend; the hot water pipe is connected to the bypass pipe; at this time, the pressure of the water flow in the hot water pipe cannot overcome the elastic force of the first elastic member, and one end of the valve plate is pressed against the wall of the hot water pipe under the action of the first elastic member, the first valve is closed, and the cold water in the hot water pipe does not enter the outlet pipe.

[0054] When the water heater is initially started, the cold water retained in the hot water pipe begins to flow. At this time, due to the low water temperature, the paraffin in the first bladder is still in a contracted state, and the cold water in the hot water pipe returns to the cold water pipe from the bypass pipe through the one-way valve for circulation.

[0055] When the water heater is working, the water flowing through the heat exchange tube group of the water heater is heated, and the heated water flows into the hot water pipe. At this time, the piston and the copper tube feel the water temperature getting hotter, and the volume of the paraffin in the first bladder gradually expands. Since the push rod is stationary, the copper tube moves upward under the action of the push rod, driving the piston to move upward and pulling the other end of the first elastic member upward.

[0056] As the water temperature in the hot water pipe gradually increases, the first bladder expands accordingly; when the water temperature in the hot water pipe reaches the set value, the paraffin in the first bladder expands to the limit, and the piston blocks the inlet of the bypass pipe under the drive of the copper tube. The other end of the first elastic member is pulled up by the push plate, driving the valve plate to rotate, opening the first water inlet, and the hot water in the hot water pipe enters the outlet pipe from the first water inlet, and the hot water that meets the requirements is discharged through the outlet. The zero cold water function is realized.

[0057] When the water heater stops working, the temperature of the hot water in the hot water pipe decreases over time, the volume of the paraffin in the first capsule shrinks, the push plate moves downward, and the piston moves downward under the action of its own gravity and the second elastic member, opening the entrance of the bypass pipe; at the same time, the first elastic member resets, driving the valve plate to reset and closing the first water inlet.

Claims

1. A zero-cold water mixing device, comprising a water outlet pipe (1), the water outlet pipe having a first water inlet (11) and a second water inlet (12) and a water outlet (13) arranged at intervals; the first water inlet (11) is connected to a hot water pipe (2), and the second water inlet (12) is connected to a cold water pipe (3); Features Also includes: A bypass pipe (4) connected between the cold water pipe (3) and the hot water pipe (2), wherein a one-way valve (5) is provided in the bypass pipe (4) for limiting the flow of water from the hot water pipe (2) to the cold water pipe (3); A first valve (6), arranged on the first water inlet (11), and used for opening or closing the first water inlet (11); A second valve (7) is arranged between the hot water pipe (2) and the bypass pipe (4) and is used to open or close the bypass pipe (4); A temperature sensing drive device (8) is connected between the first valve (6) and the second valve (7) and operates in accordance with changes in water temperature. When the water temperature in the hot water pipe (2) reaches a set temperature, the first valve (6) is opened and the second valve (7) is closed. When the water temperature in the hot water pipe (2) is lower than the set temperature, the first valve (6) is closed and the second valve (7) is opened.

2. The zero-cold water mixing device according to claim 1, characterized in that The first valve (6) comprises a valve plate (61) stopped on the first water inlet (11), and a first elastic member (62); One end of the valve plate (61) is rotatably limited on the inner wall connected to the hot water pipe (2), and the other end is connected to the first elastic member (62); The first elastic member (62) is connected to the temperature sensing drive device (8).

3. The zero-cold water mixing device according to claim 2, characterized in that The portion of the inner wall of the hot water pipe corresponding to the other end of the valve plate (61) is an arc-shaped structure.

4. The zero-cold water mixing device according to claim 2, characterized in that The second valve (7) comprises a piston (71) which can move radially in the bypass pipe (4) or on the bypass pipe port, and a second elastic member (72); The second elastic member (72) abuts between the piston (71) and the temperature-sensing drive device (8); The temperature sensing driving device (8) is drivingly connected to the piston (71).

5. The zero-cold water mixing device according to claim 4, characterized in that The temperature sensing driving device (8) comprises a heat-conducting shell (81), wherein a first capsule (82) is arranged in the shell (81), and the first capsule (82) is filled with paraffin (83); one end of the shell (81) is drivingly connected to the piston (71), and the other end of the shell is connected to a second capsule (86), and the second capsule is accommodated in a limiting groove (84), and the limiting groove (84) is arranged on the inner wall of the hot water pipe (2); The lower end of the shell (81) is open; correspondingly, the second capsule (86) is provided with a through hole (89) so that the first capsule (82) can pass through the through hole and be partially accommodated in the second capsule (86); A push rod (87) is provided in the second sac (86), and the push rod (87) abuts against the first sac (82) and can pass through the through hole (89).

6. The zero-cold water mixing device according to claim 5, characterized in that A push plate is connected to the outer wall of the second capsule (86); a through hole corresponding to the through hole (89) is provided on the push plate; The lower port of the housing (81) is connected to the push plate; The other end of the first elastic member (62) is connected to the push plate.

7. The zero-cold water mixing device according to claim 6, characterized in that The top rod (87) is connected to a base (88), and the base (88) is accommodated in the second capsule (86).

8. The zero-cold water mixing device according to claim 7, characterized in that The housing (81) is a copper tube.

9. The zero-cold water mixing device according to any one of claims 4 to 8, characterized in that The piston (71) is a copper piston.

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