CN116878168A

CN116878168A - Dual cycle gas water heater

Info

Publication number: CN116878168A
Application number: CN202310800027.8A
Authority: CN
Inventors: 金晶; 周高云
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2023-06-30
Filing date: 2023-06-30
Publication date: 2023-10-13

Abstract

A dual-cycle gas water heater includes a casing, a heat exchanger, a heat exchange pipe, an inlet pipe, an outlet pipe, an external hot water pipe, an external return pipe and a control panel. It is characterized in that the water heater also includes a three-way electromagnetic switching valve and a In the internal return pipe, the water inlet port of the three-way electromagnetic switching valve is connected to the water outlet pipe. The first water outlet port is connected to the external hot water pipe. The second water outlet port is connected to the water inlet pipe through an internal return pipe. The internal return pipe is arranged on the machine. The shell is also provided with a second one-way valve that ensures that water can only flow from the internal return pipe to the water inlet pipe, and the three-way electromagnetic switching valve is connected to the control panel. Using a double circulation system, the outer circulation can realize hot water for the first use, and the inner circulation can realize the use of water again without cold water, and it is more energy-saving and environmentally friendly.

Description

Double-circulation gas water heater

Technical Field

The invention relates to a water heater, in particular to a gas water heater.

Background

The interlayer water phenomenon is a phenomenon that a user turns off water after using hot water normally and experiences a section of cold water in the using process when boiled water is boiled again. The phenomenon is that the water heater is ignited in the process from closing to restarting, and the process is generally about 2S, so that the water flows through the water heater in the period of time, a user can experience the period of cold water when using boiled water again, the period of cold water is delayed to the user end in time due to the length of a pipeline, the water still is hot water after the boiled water in feel, but a period of cold water is clamped in a ginseng mode suddenly, and the phenomenon of interlayer cold water is caused. The water inlet temperature is low in winter, which is particularly obvious.

The circulation pipeline of the general zero water chiller type is an external circulation system, and the water temperature of the whole circulation loop is reduced in an external circulation state, for example, the water outlet Tout=T of the water heater is set (42 ℃), and the water inlet Tin of the water heater is approximately equal to 32 ℃. Because the water heater has minimum heating power in the cyclic heating process, and because the external circulation pipeline is longer, the serious heat dissipation problem exists, the water circulation can not be carried out only to even the water path temperature, and particularly the phenomenon that the pipeline water temperature is rapidly reduced in winter can be caused, so that even if the temperature difference between the outlet water temperature and the inlet water temperature is necessarily present in the cyclic heating state, the temperature difference between the inlet water temperature and the outlet water temperature is at least about 10 ℃ according to the common minimum power calculation of the existing gas water heater. So that the user can experience the temperature difference of at least 10 ℃ when boiled water is boiled after the water is closed;

moreover, the way of relieving the phenomenon of 'interlayer water' by using the external circulation function is very energy-consuming and has poor effect. Because the external circulation pipeline is generally longer, the length of the pipeline is about 50m according to the calculation of a living environment of 100 square meters, and the heat dissipation of the pipeline is added, so that the water in the whole pipeline is circularly heated for at least 3 minutes; if the inlet end temperature tstretch is to be maintained high for 24 hours throughout the winter, the user's consumption of fuel gas is unacceptable.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a double-circulation gas water heater which can basically avoid the phenomenon of water interlayer aiming at the state of the art.

The technical scheme adopted for solving the technical problems is as follows: a dual-cycle gas water heater comprises

A housing;

the heat exchanger is arranged in the shell;

the heat exchange tube is arranged in the heat exchanger;

the water inlet pipe is connected with the water inlet end of the heat exchange pipe, and is provided with a flowmeter, a water inlet temperature sensor and a circulating pump;

the water outlet pipe is connected with the water outlet end of the heat exchange pipe, and a water outlet temperature sensor is arranged on the water outlet pipe;

an outer hot water pipe connected with the water outlet pipe and arranged outside the shell;

the outer return pipe is connected between the outer hot water pipe and the water inlet pipe, and is provided with a first one-way valve for ensuring that water can only flow from the outer hot water pipe to the water inlet pipe;

the control board is connected with the flowmeter, the water inlet temperature sensor, the circulating pump and the water outlet temperature sensor;

characterized in that the water heater also comprises

The three-way electromagnetic switching valve is characterized in that the water inlet port is connected with the water outlet pipe, the first water outlet port is connected with the external hot water pipe, the second water outlet port is connected with the water inlet pipe through an internal water return pipe, the internal water return pipe is arranged in the shell and provided with a second one-way valve which ensures that water can only flow from the internal water return pipe to the water inlet pipe, and the three-way electromagnetic switching valve is connected with the control board.

Preferably, the three-way electromagnetic switching valve comprises

The valve body is provided with a water inlet port, a first water outlet port, a second water outlet port, a first valve port and a second valve port, the first valve port is communicated with the first water outlet port, the second valve port is communicated with the second water outlet port, the water inlet port is positioned between the first valve port and the second valve port,

the valve rod is axially movably arranged in the valve of the valve body;

the end cap is arranged at the end part of the valve rod and can open and close the first valve port;

the valve core is arranged in the middle of the valve rod and can open and close the second valve port;

the coil is arranged at the rear end of the valve body and is provided with an inner cavity;

the isolating sleeve is arranged in the inner cavity of the coil and is provided with an axial cavity into which the rear end of the valve rod extends; and

and the spring is arranged in the axial cavity of the isolation sleeve and props against the rear end of the valve rod.

Further, the rear end of the valve core is provided with a sealing gasket capable of sealing the second valve port.

Preferably, the isolation sleeve comprises a main body part and an extending part protruding backwards from the main body part, the main body part is hermetically arranged in the inner cavity of the valve body, the extending part is arranged in the inner cavity of the coil, and the spring is arranged in the axial inner cavity of the extending part.

Preferably, the valve core and the valve rod are integrally injection molded.

Compared with the prior art, the invention has the advantages that: the double circulation system is adopted, the external circulation realizes the first use of hot water, the internal circulation realizes the reuse of water without cold water, the energy is saved, the environment is protected, the two-position three-way waterway switching can be realized by combining the three-way switching valve, the required valve opening force is small, and the heating problem of the electromagnetic valve is solved. The double-circulation system has strong matching performance and higher cost, and can be suitable for the existing zero-water chiller type to upgrade and reform.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment.

Fig. 2 is an enlarged view of the external structure of the three-way electromagnetic switching valve in the embodiment.

Fig. 3 is a schematic structural view of the three-way electromagnetic switching valve (after removing the valve body and the coil).

Fig. 4 is an exploded view of fig. 3.

Fig. 5 is a schematic view of the three-way electromagnetic switching valve in a state where the first valve port is opened.

Fig. 6 is a schematic view of the three-way electromagnetic switching valve in a state where the second valve port is opened.

Fig. 7 is a control schematic of an embodiment.

FIG. 8 is a graph showing the temperature fluctuation of boiled water again in the example.

Detailed Description

The invention is described in further detail below with reference to the embodiments of the drawings.

As shown in fig. 1, the dual cycle gas water heater in this embodiment includes a casing 1, a heat exchanger 2, a heat exchange tube 21, a water inlet tube 31, a water outlet tube 32, an outer hot water tube 33, an outer return tube 34, a control board 10, a three-way electromagnetic switching valve 5, and an inner return tube 35.

The heat exchanger 2 is arranged in the shell 1, the heat exchange tube 21 is arranged in the heat exchanger 2, the water inlet pipe 31 is connected with the water inlet end of the heat exchange tube 21, and the water inlet pipe 31 is provided with a flowmeter 311, a water inlet temperature sensor 312 and a circulating pump 313; the water outlet pipe 32 is connected with the water outlet end of the heat exchange pipe 21, and a water outlet temperature sensor is arranged on the water outlet pipe 32.

An outer hot water pipe 33 is connected with the water outlet pipe 32 and is arranged outside the shell 1; an outer return pipe 34 is connected between the outer hot water pipe 33 and the inlet pipe 31, the outer return pipe 34 being provided with a first non-return valve 61 ensuring that water can only flow from the outer hot water pipe 33 to the inlet pipe 31.

As shown in fig. 7, the control board 10 is connected to a flow meter 311, a water inlet temperature sensor 312, a three-way electromagnetic switching valve 5 circulation pump 313, and a water outlet temperature sensor 321.

The water inlet port 511 of the three-way electromagnetic switching valve 5 is connected with the water outlet pipe 32, the first water outlet port 512 is connected with the outer hot water pipe 33, the second water outlet port 513 is connected with the water inlet pipe 31 through the inner water return pipe 35, and the inner water return pipe 35 is arranged in the casing 1 and provided with the second one-way valve 62 which can only flow from the inner water return pipe 35 to the water inlet pipe 31.

As shown in fig. 2 to 6, the three-way electromagnetic switching valve 5 in the present embodiment includes a valve body 51, a valve rod 52, an end cap 53, a valve element 54, a coil 55, a spacer 56, and a spring 57.

The valve body 51 has a water inlet port 511, a first water outlet port 512, a second water outlet port 513, a first valve port 514 and a second valve port 515, the first valve port 514 communicates with the first water outlet port 512, the second valve port 515 communicates with the second water outlet port 513, the first valve port 514 and the second valve port 515 are on the same axis, the water inlet port 511 is located between the first valve port 514 and the second valve port 515,

the valve rod 52 is axially movably arranged on the connecting axis of the first valve port 514 and the second valve port 515; an end cap 53 is provided at the end of the valve stem 52 and is capable of opening and closing the first valve port 514.

The valve core 54 is arranged in the middle of the valve rod 52 and can open and close the second valve port 515, and the valve core 54 and the valve rod 52 are formed by integral injection molding. The rear end of the valve core 54 is provided with a gasket 58 capable of sealing the second valve port 515.

The coil 55 is arranged at the rear end of the valve body 51 and is provided with an inner cavity; the isolating sleeve 56 is arranged in the inner cavity of the coil 55 and is provided with an axial cavity into which the rear end of the valve rod 52 extends; the spacer 56 in this embodiment includes a main body 561 and an extending portion 562 protruding backward from the main body 561, the main body 561 is sealingly disposed in the cavity of the valve body 51, the extending portion 562 is disposed in the cavity of the coil 55, and the spring 57 is disposed in the axial cavity of the extending portion 562.

A spring 57 is disposed within the axial cavity of the spacer 56 and against the rear end of the valve stem 52 for return of the valve stem 52.

Description of waterway switching principle:

1. external circulation loop

As shown in fig. 1 and 5, in the external circulation state, the three-way electromagnetic switching valve is not energized. At this time, under the action of the compression force of the spring, the whole valve core and the sealing gasket are propped against the second valve port, the second valve port is in a closed state, the end cap on the valve rod is far away from the first valve port, and the first valve port is in an open state. Because the two sides of the valve core in the axial direction are filled with water and no pressure difference exists, the valve core is not influenced by water pressure in the axial direction, the end cap is influenced by water flow acting force, the water flow acting force and the spring acting force are the same in direction, the spring force design of the spring is not required to be large, and the first valve port is in a normally open state, so that normal water use and external circulation functions are ensured. At this time, water flows from the water outlet pipe to the external hot water pipe through the three-way electromagnetic switching valve and then flows into the external water return pipe.

2. Internal circulation loop

When the waterway is required to be switched from the outer circulation state to the inner circulation state, the three-way electromagnetic switching valve is electrified, the coil converts electric energy into electromagnetic field force and acts on the valve rod, so that the valve rod drives the valve core to move rightwards against the spring force, the design requirement of the electromagnetic field force can be met by selecting a low-power electromagnetic coil because the spring force can be designed to be smaller, the heating value is small, the cost is lower until the end cap abuts against the first valve port, at the moment, the first valve port is closed, the second valve port is opened, the water flow direction is as shown in fig. 6, and the inner circulation loop is opened.

The three-way switching valve and the internal circulation pipeline are added in the whole machine, and meanwhile, the external circulation pipeline is reserved, so that a double circulation system is formed. In the state of the internal circulation pipeline, the whole machine circularly heats the water path through the circulation pump, and the internal circulation pipeline is short and inside the machine, so that the problem of heat dissipation of the pipeline can be ignored, the heating can be stopped after a certain temperature is reached, the water path continues to circulate, and the water temperature in the pipeline can be completely consistent (Tout=Tin=Tset). In the ignition process of the whole machine, hot water in the water inlet end and the heat exchange tube is discharged, cold water is replenished, the total volume capacity of the heat exchange coil and the water inlet tube of the 16L gas water heater is 0.25L according to the water flow rate of 7L/min of a common user, and the cold water is replenished after 2.14S, and the whole machine is in a heating state after the ignition process, so that the empty window period for generating interlayer cold water can be completely avoided. So the temperature fluctuation is almost not generated after the user turns off the water and rewarms the water in theory, and the time experiment proves that the temperature fluctuation of the rewarming water can be controlled within 2 ℃ as shown in fig. 8, and the effect is obvious. The internal circulation pipeline is short, the circulation period can be controlled within 10S, and the energy consumption of the fuel gas is greatly reduced;

in conclusion, the external circulation system can meet the requirements of first boiled water and hot water, the internal circulation can solve the interlayer cold water problem of boiled water again, the energy consumption can be greatly reduced, and the internal and external circulation is matched to really realize zero cold water.

Examples of the embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functionality. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for purposes of describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and because the disclosed embodiments of the present invention may be arranged in different orientations, these directional terms are merely for illustration and should not be construed as limitations, such as "upper", "lower" are not necessarily limited to orientations opposite or coincident with the direction of gravity. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly.

Claims

1. A dual-cycle gas water heater, including

Chassis(1);

The heat exchanger (2) is located in the aforementioned casing (1);

The heat exchange tube (21) is located in the aforementioned heat exchanger (2);

The water inlet pipe (31) is connected to the water inlet end of the aforementioned heat exchange pipe (21). The water inlet pipe (31) is provided with a flow meter (311), an inlet water temperature sensor (312) and a circulation pump (313);

The water outlet pipe (32) is connected to the water outlet end of the aforementioned heat exchange pipe (21), and the water outlet pipe (32) is provided with an outlet water temperature sensor;

The external hot water pipe (33) is connected to the aforementioned water outlet pipe (32) and is located outside the aforementioned casing (1);

The external return pipe (34) is connected between the aforementioned external hot water pipe (33) and the water inlet pipe (31). The external return pipe (34) is provided with a structure to ensure that water can only flow from the external hot water pipe (33) to the inlet pipe. The first one-way valve (61) of the water pipe (31);

The control board (10) is connected to the aforementioned flow meter (311), inlet water temperature sensor (312), circulation pump and outlet water temperature sensor;

It is characterized in that the water heater also includes

Three-way electromagnetic switching valve (5), the water inlet port (511) is connected to the water outlet pipe (32), the first water outlet port (512) is connected to the external hot water pipe (33), and the second water outlet port (513) passes through an inner The return pipe (35) is connected to the water inlet pipe (31). The inner return pipe (35) is arranged in the casing (1) and is provided with a third pipe to ensure that water can only flow from the inner return pipe (35) to the water inlet pipe (31). Two one-way valves (62), and the three-way electromagnetic switching valve (5) is connected to the control panel (10).

2. The dual-cycle gas water heater according to claim 1, characterized in that the three-way electromagnetic switching valve (5) includes

The valve body (51) has a water inlet port (511), a first water outlet port (512), a second water outlet port (513), a first valve port (514) and a second valve port (515). The aforementioned first The valve port (514) is connected with the first water outlet port (512), the aforementioned second valve port (515) is connected with the second water outlet port (513), and the aforementioned water inlet port (511) is located at the first valve port (514) and the second valve port (515),

The valve stem (52) is axially movably located in the valve body (51);

The end cap (53) is located at the end of the aforementioned valve stem (52) and can open and close the first valve port (514);

The valve core (54) is located in the middle of the aforementioned valve stem (52) and can open and close the second valve port (515);

The coil (55) is located at the rear end of the aforementioned valve body (51) and has an inner cavity;

The isolation sleeve (56) is located in the inner cavity of the aforementioned coil (55) and has an axial cavity for the rear end of the valve stem (52) to extend into; and

The spring (57) is located in the axial cavity of the aforementioned isolation sleeve (56) and offsets the rear end of the valve stem (52).

3. The dual-cycle gas water heater according to claim 2, characterized in that the rear end of the valve core (54) is provided with a sealing gasket (58) capable of sealing the second valve port (515).

4. The dual-cycle gas water heater according to claim 2, wherein the isolation sleeve (56) includes a main body (561) and an extending portion (562) protruding backward from the main body (561). The aforementioned main body portion (561) is sealingly provided in the inner cavity of the valve body (51), the aforementioned extending portion (562) is provided in the inner cavity of the coil (55), and the described spring (57) is provided in the extending portion. The axial inner cavity of the part (562).

5. The dual-cycle gas water heater according to claim 2, characterized in that the valve core (54) and the valve stem (52) are formed by integral injection molding.