A zero-cold-water gas water heater

Abstract

The present invention discloses a zero - cold - water gas water heater, which includes a water heater body, a hot - water pipeline, a cold - water pipeline, and a return water branch. Both ends of the return water branch are respectively communicated with the hot - water pipeline and the cold - water pipeline. Further, it includes a water mixing prevention device, and the water mixing prevention device is respectively connected to the cold - water pipeline and the return water branch; the water mixing prevention device can automatically disconnect or automatically connect the return water branch when the water pressure of cold water in the water mixing prevention device becomes smaller or larger. By setting the water mixing prevention device that can automatically connect or disconnect the return water branch according to the change of the water pressure of cold water, there is no power loss, effectively solving the pain point of "water mixing" where hot water enters the cold - water pipeline when users use cold water, thereby avoiding gas waste caused by the accidental opening of the gas water heater due to "water mixing".

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and particularly to a zero - cold - water gas water heater capable of solving the problem of mixed water. Background Art

[0002] With the improvement of consumers' requirements for the quality of life, "zero - cold - water" gas water heaters are becoming more and more common. When installing a "zero - cold - water" gas water heater, there are two actual situations: with a return water pipe and without a return water pipe.

[0003] For the case without a return water pipe, a check valve is installed between the hot water pipe and the cold water pipe at the farthest water - using point to press the cold water in the hot water pipe into the cold water pipe. When the cold water is separately turned on at the farthest water - using point, the check valve may be mistakenly opened due to a large pressure difference, and the water in the hot water pipe will flow into the cold water pipe, resulting in "mixed water". Summary of the Invention

[0004] The present invention aims to solve at least one of the problems existing in the related art to a certain extent. For this purpose, the present invention provides a zero - cold - water gas water heater, which has a simple structure, no power loss, solves the pain point of "mixed water" when the user uses cold water at the farthest water - using end, and avoids the phenomenon of gas waste caused by the mis - opening of the zero - cold - water gas water heater due to "mixed water".

[0005] The above object is achieved by the following technical solutions:

[0006] A zero - cold - water gas water heater includes a water heater body, a hot water pipeline, a cold water pipeline, and a return water branch. The two ends of the return water branch are respectively connected to the hot water pipeline and the cold water pipeline. It further includes an anti - mixed - water device, and the anti - mixed - water device is respectively connected to the cold water pipeline and the return water branch; the anti - mixed - water device can automatically disconnect the return water branch when the cold water pressure in the anti - mixed - water device becomes small, or automatically connect the return water branch when the cold water pressure in the anti - mixed - water device increases.

[0007] In some embodiments, the anti - mixed - water device includes a valve body with a cavity, and a valve core movably arranged in the valve body and separating the cavity into a first cavity and a second cavity. At the upper end of the valve body, there is a first water inlet connected to the inlet end of the return water branch, and at the lower end, there is a first water outlet connected to the outlet end of the return water branch. The position of the first water outlet is opposite to the position of the first water inlet; the valve core is provided with a through - hole for water flow to pass through. The first cavity is connected to the cold water pipeline, and the valve core can move horizontally with the change of the cold water pressure in the first cavity, so that the through - hole is in a connected or disconnected state with the first water inlet and the first water outlet.

[0008] In some embodiments, the valve core has a columnar structure.

[0009] In some embodiments, the anti - mixing water device further includes an elastic member disposed in the second cavity, and two ends of the elastic member are respectively connected to the valve core and the inner side wall of the second cavity.

[0010] In some embodiments, one end of the elastic member is connected to the middle of the valve core, and the other end is connected to the middle of the inner side wall of the second cavity facing the valve core.

[0011] In some embodiments, the anti - mixing water device further includes at least one limiting portion, and the limiting portion is disposed in the second cavity to limit the displacement of the valve core moving horizontally towards the elastic member.

[0012] In some embodiments, when the valve core abuts against the limiting portion, the matching communication area between the through - hole and the first water inlet and the first water outlet is the largest.

[0013] In some embodiments, the number of the limiting portions is two, and the two limiting portions are respectively disposed on the inner side of the top and the inner side of the bottom of the second cavity.

[0014] In some embodiments, the valve body is provided with a second water inlet and a second water outlet. The second water inlet is respectively communicated with the water inlet section of the cold water pipeline and the first cavity, and the second water outlet is respectively communicated with the water outlet section of the cold water pipeline and the first cavity.

[0015] In some embodiments, the second water inlet and the second water outlet are respectively disposed at the upper and lower ends of the valve body.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: By providing an anti - mixing water device that can automatically connect or disconnect the return water branch according to the change of the water pressure of cold water, without power loss, the present invention effectively solves the pain point of "mixed water" when users use cold water, that is, hot water enters the cold water pipeline, thus avoiding the phenomenon of gas waste caused by the mis - opening of the gas water heater due to "mixed water". BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a zero - cold - water gas water heater in an embodiment of the present invention;

[0018] Figure 2 is a partial structural schematic diagram of a zero - cold - water gas water heater in an embodiment of the present invention;

[0019] Figure 3FIG. 0 is a schematic structural diagram of the anti-mixing water device in an embodiment of the present invention. In the figure, when the user does not use cold water, the through hole 21 is in a cooperating and communicating state with the first water inlet 511 and the first water outlet 512.

[0020] Figure 4 FIG. 4 is a schematic structural diagram of the anti-mixing water device in an embodiment of the present invention. In the figure, when the user is using cold water, the through hole 21 is in a disconnected state from the first water inlet 511 and the first water outlet 512. Specific Embodiments

[0021] The following embodiments are used to illustrate the present invention, but the present invention is not limited by these embodiments. Modifying the specific embodiments of the present invention or equivalently replacing some technical features without departing from the spirit of the present invention's solution shall be covered within the scope of the technical solution claimed by the present invention.

[0022] As Figures 1-3 shown, a zero-cold-water gas water heater in this embodiment includes a water heater body 1, a hot water pipeline 2, a cold water pipeline 3, and a return water branch 4. The hot water pipeline 2 and the cold water pipeline 3 are respectively connected to the water heater body 1, and the return water branch 4 is respectively connected to the hot water pipeline 2 and the cold water pipeline 3. Among them, it further includes an anti-mixing water device 5, and the anti-mixing water device 5 is respectively connected to the cold water pipeline 3 and the return water branch 4; the anti-mixing water device 5 can automatically disconnect the return water branch 4 when the cold water pressure in the anti-mixing water device 5 becomes small, or automatically connect the return water branch 4 when the cold water pressure in the anti-mixing water device 5 increases. In this embodiment, the master bedroom bathroom is used as the farthest water usage point, and both the return water branch 4 and the anti-mixing water device 5 are close to the farthest water usage point. When the user uses cold water at the farthest end, the anti-mixing water device 5 relieves pressure to make the cold water pressure in the anti-mixing water device 5 become small, and then the anti-mixing water device 5 can automatically disconnect the return water branch 4; conversely, when cold water is not used at the farthest end, the cold water pressure in the anti-mixing water device 5 increases and the anti-mixing water device 5 automatically connects the return water branch 4 to facilitate the water heater to preheat the circulating water.

[0023] For the zero-cold-water gas water heater in this embodiment, its anti-mixing water device 5 can automatically connect or disconnect the return water branch 4 according to the change in the cold water pressure, without power loss, effectively solving the pain point of "mixing water" when the user uses cold water and hot water enters the cold water pipeline 3, thereby avoiding gas waste caused by the incorrect opening of the zero-cold-water gas water heater due to "mixing water".

[0024] As Figures 2-3As shown in the figure, further, the anti-mixing water device 5 includes a valve body 51 with a cavity and a valve core 52. At the upper end of the valve body 51, there is a first water inlet 511 communicating with the water inlet end 41 of the return water branch 4, and at the lower end, there is a first water outlet 512 communicating with the water outlet end 42 of the return water branch 4. The position of the first water outlet 512 is arranged opposite to the position of the first water inlet 511; the valve core 52 is provided with a through hole 521 for water flow to pass through. The valve core 52 is movably arranged in the valve body 51 and divides the cavity into a first cavity 5101 and a second cavity 5102, wherein the first cavity 5101 communicates with the cold water pipeline 3. The valve core 52 can move horizontally with the change of the cold water pressure in the first cavity 5101, so that the through hole 521 is in a state of being in cooperation and communication or disconnection with the first water inlet 511 and the first water outlet 512. Thus, when the user uses cold water at the farthest end, the water pressure of the cold water in the first cavity 5101 decreases, causing the valve core 52 to automatically move horizontally towards the first cavity 5101 under the pressure difference between the first cavity 5101 and the second cavity 5102, and further making the through hole 521 in a disconnected state from the first water inlet 511 and the first water outlet 512, realizing the cutting off of the return water branch 4 and preventing hot water from entering the first cavity 5101 through the water inlet end 41 of the return water branch 4 and causing "water mixing".

[0025] Preferably, the valve core 52 has a columnar structure, and the through hole 521 is arranged in the valve core 52 and penetrates the bottom and top of the valve core 52. In this way, when the valve core 52 moves horizontally towards the first cavity 5101, the top surface and the bottom surface of the valve core 52 can correspondingly block the first water inlet 511 and the first water outlet 512, avoiding hot water from entering the first cavity 5101 through the water inlet end 41 and the first water inlet 511 and causing "water mixing".

[0026] Specifically, a second water inlet 513 and a second water outlet 514 are also provided at the upper and lower ends of the valve body 51. The second water inlet 513 communicates with the water inlet section 31 of the cold water pipeline 3 and the first cavity 5101 respectively, and the second water outlet 514 communicates with the water outlet section 32 of the cold water pipeline 3 and the first cavity 5101 respectively. In this way, through the second water inlet 513 and the second water outlet 514, the valve body 51 is connected in series in the cold water pipeline 3, so that the pressure in the first cavity 5101 can change in real time according to the change of the cold water pressure in the cold water pipeline 3.

[0027] Further, the anti - mixing water device 5 further includes an elastic member 53 disposed in the second cavity 5102. The two ends of the elastic member 53 are respectively connected to the valve core 52 and the inner side wall of the second cavity 5102. Thus, by arranging the elastic member 53 in the second cavity 5102, when the cold water pressure in the first cavity 5101 begins to decrease due to the user using cold water, the valve core 52 can quickly move towards the first cavity 5101 under the pre - tightening force of the elastic member 53, timely cutting off the passage between the through - hole 521, the first water inlet 511 and the first water outlet 512, which is beneficial to improving the accuracy and reliability of the on - off control of the return water branch 4 and enhancing the anti - mixing water effect.

[0028] Preferably, the elastic member 53 is a spring. One end of the spring is connected to the middle part of the valve core 52, and the other end is connected to the middle part of the inner side wall of the second cavity 5102 facing the valve core 52 to ensure the balanced force on both ends of the valve core 52 and prevent the abnormal phenomenon of the valve core 52 tilting during the horizontal movement.

[0029] Further, the anti - mixing water device 5 further includes at least one limiting portion 54. The limiting portion 54 is disposed in the second cavity 5102 to limit the displacement of the valve core 52 moving horizontally towards the elastic member 53. When the valve core 52 abuts against the limiting portion 54, the matching communication area between the through - hole 521, the first water inlet 511 and the first water outlet 512 is the largest. In this way, under the action of the limiting portion 54, even if the water pressure in the first cavity 5101 surges, the through - hole 521 is always in the state of the largest matching communication area with the first water inlet 511 and the first water outlet 512, avoiding the reduction or even disconnection of the water flow in the return water branch 4 due to the excessive water pressure in the first cavity 5101, and further affecting the pre - heating effect of the water heater.

[0030] Preferably, the number of the limiting portions 54 is two. The two limiting portions 54 are respectively arranged on the inner side of the top and the inner side of the bottom of the second cavity 5102 to ensure the balanced force on the upper and lower ends of the valve core 52 and further prevent the valve core 52 from tilting during the movement.

[0031] The following combines Figures 3-4 to illustrate the working principle of the anti - mixing water device 5 in this embodiment:

[0032] As Figure 3 shown, when there is no cold water used at the farthest end or the cold water valve at the farthest end is closed, the water pressure in the first cavity 5101 increases. When the pressure in the first cavity 5101 is greater than the sum of the pre - tightening force of the elastic member 53 and the pressure in the second cavity 5102, the valve core 52 automatically moves horizontally towards the second cavity 5102. When the valve core 52 moves to abut against the limiting portion 54, the through - hole 521, the first water inlet 511 and the first water outlet 512 are in the largest matching communication state, enabling the return water branch 4 to be connected, which is beneficial to the water heater to pre - heat the circulating water.

[0033] As Figure 4 shown, when the user uses cold water at the farthest end, the pressure in the first cavity 5101 begins to decrease. Under the combined action of the pressure in the second cavity 5102 and the pre-tightening force of the elastic member 53, the valve core 52 automatically moves horizontally towards the first cavity 5101, i.e., the direction of the elastic member 53, so that the through hole 521 is in a disconnected state from the first water inlet 511 and the first water outlet 512, thereby cutting off the return water branch 4, preventing hot water from entering the first cavity 5101 and causing the "water mixing" phenomenon, avoiding the mis-opening phenomenon of the water heater due to "water mixing", and being beneficial to reducing unnecessary consumption of gas.

[0034] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A zero - cold - water gas water heater, comprising a water heater body (1), a hot - water pipeline (2), a cold - water pipeline (3) and a return - water branch (4). Both ends of the return - water branch (4) are respectively communicated with the hot - water pipeline (2) and the cold - water pipeline (3). It is characterized in that, It further includes a water mixing prevention device (5), and the water mixing prevention device (5) is respectively connected to the cold water pipeline (3) and the return water branch (4); The water mixing prevention device (5) can automatically disconnect the return water branch (4) when the cold water water pressure in the water mixing prevention device (5) becomes small, or automatically connect the return water branch (4) when the cold water water pressure in the water mixing prevention device (5) increases; The water mixing prevention device (5) includes: A valve body (51) having a cavity, a first water inlet (511) communicating with the water inlet end (41) of the return water branch (4) is provided at the upper end of the valve body (51), and a first water outlet (512) communicating with the water outlet end (42) of the return water branch (4) is provided at the lower end; A valve core (52) movably arranged in the valve body (51) and separating the cavity into a first cavity (5101) and a second cavity (5102), the valve core (52) is provided with a through hole (521) for water flow to pass through, the through hole (521) penetrates the bottom and top of the valve core (52), the first cavity (5101) is connected to the cold water pipeline (3), and the valve core (52) can move horizontally with the change of the cold water water pressure in the first cavity (5101), so that the through hole (521) is in a communicating or disconnected state with the first water inlet (511) and the first water outlet (512); An elastic member (53) arranged in the second cavity (5102), and two ends of the elastic member (53) are respectively connected to the valve core (52) and the inner side wall of the second cavity (5102).

2. The zero - cold - water gas water heater according to claim 1, characterized in that, The position of the first water outlet (512) is oppositely arranged to the position of the first water inlet (511).

3. The zero - cold - water gas water heater according to claim 1, characterized in that, The valve core (52) has a columnar structure.

4. The zero - cold - water gas water heater according to claim 1, characterized in that, One end of the elastic member (53) is connected to the middle of the valve core (52), and the other end is connected to the middle of the inner side wall of the second cavity (5102) facing the valve core (52).

5. The zero - cold - water gas water heater according to claim 1 or 4, characterized in that, The water mixing prevention device (5) further includes at least one limiting portion (54), and the limiting portion (54) is arranged in the second cavity (5102) to limit the displacement of the valve core (52) moving horizontally towards the elastic member (53).

6. The zero - cold - water gas water heater according to claim 5, characterized in that, When the valve core (52) abuts against the limiting portion (54), the matching communication area between the through hole (521), the first water inlet (511) and the first water outlet (512) is the largest.

7. The zero - cold - water gas water heater according to claim 6, characterized in that, The number of the limiting portions (54) is two, and the two limiting portions (54) are respectively arranged at the inner side of the top and the inner side of the bottom of the second cavity (5102).

8. The zero - cold - water gas water heater according to claim 1, characterized in that, The valve body (51) is provided with a second water inlet (513) and a second water outlet (514), the second water inlet (513) is respectively connected to the water inlet section (31) of the cold water pipeline (3) and the first cavity (5101), and the second water outlet (514) is respectively connected to the water outlet section (32) of the cold water pipeline (3) and the first cavity (5101).

9. The zero - cold - water gas water heater according to claim 8, characterized in that, The second water inlet (513) and the second water outlet (514) are respectively arranged at the upper and lower ends of the valve body (51).

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