CN211625686U - Gas boiler with bypass function - Google Patents

Abstract

The utility model provides a gas boiler, which comprises a casing, a burner, a heat exchanger accommodated in the casing, and a waterway component installed on the bottom plate of the casing. The waterway component includes a heating return water pipeline and a heating water outlet pipeline extending out of the bottom plate of the housing. The heating return water pipeline is formed with a heating return water outlet at the end, and a heating water outlet is formed at the end of the heating water outlet pipeline. The heating return water outlet and the heating water outlet can be External radiators are piped to form a heating circuit. The water circuit assembly also includes a bypass pipeline connected between the heating return water pipeline and the heating water outlet pipeline, so as to ensure a certain water flow through the bypass pipeline when the heating circuit is closed or blocked. Because the bypass pipeline is directly erected between the heating return water pipeline and the heating water outlet pipeline, while ensuring the heating water bypass function, it can also prevent the heating water from entering the heat exchange pipeline and heating the water in the external water tank.

Description

Gas boiler with bypass function

technical field

The utility model relates to a gas boiler, in particular to a heating water bypass mechanism of the gas boiler.

Background technique

Domestic gas boilers include dual-purpose furnaces and system furnaces. Among them, the dual-purpose furnace can not only be used to provide domestic hot water alone, but also can be connected with a radiator installed in the room to provide heating function; on the one hand, the system furnace can be connected with an external water storage tank to provide domestic hot water, on the other hand Can be used in conjunction with a radiator to provide heating. When the system furnace is in use, the valve of the heating circuit may be artificially closed or the heating pipeline may be blocked under special circumstances. This situation will cause the water in the heating circulation system to stop flowing, but the combustion and heat exchange systems are still work, such as dry burning, gasification, resulting in equipment damage. In the existing system furnace, a bypass pipeline is set up between the heating pipeline and the heat exchange pipeline leading to the water storage tank, so that when the heating circuit is blocked, the heating water will flow into the heat exchange circuit through the bypass pipeline while heating the water in the storage tank. However, at this time, the water in the heating water storage tank is not what the user wants, so when the user turns on the faucet and wants to use the domestic water, the temperature of the water outlet will be very high, which may cause burns to the user. Obviously, this will undoubtedly cause a poor user experience. .

Utility model content

The purpose of the utility model is to provide a gas boiler, which can provide the bypass function of heating water, and at the same time can avoid heating the water in the external water storage tank.

In order to achieve the above purpose of the utility model, the utility model provides a gas-fired boiler, which comprises a casing, a burner, a heat exchanger accommodated in the casing, and a waterway assembly installed on the bottom plate of the casing. The waterway component includes a heating return water pipeline and a heating water outlet pipeline extending out of the bottom plate of the housing. The heating return water pipeline is formed with a heating return water outlet at the end, and a heating water outlet is formed at the end of the heating water outlet pipeline. The heating return water outlet and the heating water outlet can be External radiators are piped to form a heating circuit. The water circuit assembly also includes a bypass pipeline connected between the heating return water pipeline and the heating water outlet pipeline, so as to ensure a certain water flow through the bypass pipeline when the heating circuit is closed or blocked.

As a further improvement of the present invention, the waterway assembly further includes a one-way valve arranged in the bypass pipeline, so that the water flow can only flow in one direction from the heating water outlet pipeline to the heating return water pipeline.

As a further improvement of the present invention, the one-way valve has a specific opening pressure.

As a further improvement of the present utility model, the boiler also includes a cold water pipeline located in the casing, located upstream of the heat exchanger, a hot water pipeline located downstream of the heat exchanger, and a water pump located in the cold water pipeline.

As a further improvement of the present invention, the connection between the bypass pipeline and the heating return pipeline is located upstream of the water pump.

As a further improvement of the present invention, the waterway assembly also has a heat exchange water inlet and a heat exchange water outlet protruding from the bottom plate of the casing, so as to be connected with the heat exchange pipeline passing through the external water tank.

As a further improvement of the present invention, the water circuit assembly further includes an electronically controlled three-way valve, which can be controlled to activate the hot water outlet of the hot water pipeline and the heat exchange outlet and the heating outlet. The outlet line is in liquid communication.

As a further improvement of the utility model, the heat exchange water inlet is in liquid communication with the bypass pipeline.

Compared with the prior art, the beneficial effect of the utility model is: because the bypass pipeline is directly erected between the heating return water pipeline and the heating water outlet pipeline, the heating water can be avoided while the bypass function of the heating water is ensured. Enter the heat exchange line to heat the water in the external tank.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. The accompanying drawings of the utility model are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts.

1 is a perspective view of a specific embodiment of the gas boiler of the present invention;

Figure 2 is a schematic plan view of the gas boiler shown in Figure 1 after removing the front panel;

Fig. 3 is the schematic perspective view of the waterway assembly of the gas boiler shown in Fig. 2 after being connected to the bottom plate;

FIG. 4 is a schematic diagram of the working principle of the gas boiler shown in FIG. 1 after being connected to an external water tank.

Detailed ways

The present invention will be described in detail below with reference to the various embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and structural, method, or functional transformations made by those of ordinary skill in the art according to these embodiments are all included within the protection scope of the present invention.

Gas boilers use combustible gas as fuel, such as natural gas, city gas, liquefied gas, biogas, etc., by burning combustible gas to heat water to meet the needs of users for central heating and/or domestic water.

Referring to a specific embodiment of the gas boiler of the present invention shown in FIGS. 1 to 4 , and a heating system for connecting the gas boiler to an external water tank. The gas boiler 100 includes a casing 10 , a burner and heat exchanger assembly 20 , a water circuit assembly 30 , an expansion tank 50 and the like accommodated in the casing 10 .

In this embodiment, the housing 10 is roughly in the shape of a rectangular parallelepiped, which can be formed by splicing several panels, such as a front panel, a back panel, a top panel, a bottom panel, and a pair of side panels. The enclosure 10 may be mounted to a wall with its back panel facing the wall.

The combustor and heat exchanger assembly 20 generally includes a combustor casing, and a combustor 21 and heat exchanger 22 housed within the casing. The burner 21 typically includes a burner unit, such as a number of fire row fins (not shown) arranged side by side. A gas-air mixing channel will be provided on each fire exhaust sheet, and the gas and primary air conveyed through the gas delivery pipeline 15 will be mixed in the mixing channel and transferred to the fire holes located at the top of the fire exhaust sheet to burn and generate hot gas. smoke. Since the structure and arrangement of the fire row are well known to those skilled in the art, the applicant will not repeat them here. The heat exchanger 22 is provided above the burner 21 . The heat exchanger can be a fin-and-tube heat exchanger, that is, a plurality of fins are arranged in the heat exchanger shell, and a hot water absorption pipe (not marked) passes through these fins in a roundabout way, and its two ends are respectively connected to the cold water located upstream. The line 41 communicates with the hot water line 42 located downstream. The gas-air mixture is burned in the combustion chamber defined by the combustion shell, and the heat generated is absorbed by the fins and further transferred to the water flowing through the hot water suction pipe, and the heated water passes through the hot water outlet of the hot water pipe 42. The nozzle 421 flows out.

The expansion tank 50 generally includes a housing, a gas storage chamber, a liquid storage chamber formed in the housing, and an elastic diaphragm separating the gas storage chamber and the liquid storage chamber. When the pressure in the heating water pipeline is too large, the pressure change of the heating water can be absorbed by compressing the volume of the gas storage cavity.

As shown in FIG. 2 and FIG. 3 , the waterway assembly 30 is installed on the bottom plate of the casing, and includes a heating and return water pipeline 371 and a heating water outlet pipeline 372 extending out of the casing bottom plate; wherein, a heating and return water outlet is formed at the end of the heating and return water pipeline 371 13. The heating water outlet 14 is formed at the end of the heating water outlet pipeline 372 . The heating water return port 13 and the heating water outlet 14 are both protruded out of the bottom plate of the casing to be connected with an external radiator (not shown) through pipes to form a heating circuit. The water circuit assembly 20 further includes a heat exchange water inlet 11 and a heat exchange water outlet 12 protruding from the bottom of the casing, so as to be respectively connected with the heat exchange pipes 81 , 82 and 83 passing through the external water tank 90 . Referring to FIG. 4 , the heat exchange pipeline 82 forms a coil in the water tank 90 to increase the heat exchange area. The water in the main tap water pipeline enters the water tank 90 through the water inlet pipe 91, then absorbs the heat emitted by the coil 82, and finally discharges hot water for domestic use through the water outlet pipe 92 for drinking, washing, bathing, etc.

The waterway assembly 30 includes a water pump 31 on the water inlet side, a flow sensor 32, a pressure sensor 33 on the water outlet side, an electronically controlled three-way valve 34, a pressure relief valve 35, and the water inlet side and the water outlet side connected to the above waterway assembly. The bypass pipeline 361 of the heating return water pipeline 371 and the heating water outlet pipeline 372 is further connected (connected with the water channel). By arranging a bypass pipeline 361 between the heating return water pipeline 371 and the heating water outlet pipeline 372 , a certain amount of water can still flow through the bypass pipeline when the heating circuit is closed or blocked. The heat exchange water inlet 11 is in liquid communication with the bypass pipeline 361 .

The water pump 31 is connected to the cold water pipeline 41 through the water inlet port 411 , and the connection between the bypass pipeline 361 and the heating return pipeline 371 is located upstream of the water pump 31 . Referring to FIG. 4 , the water cooled after heat exchange enters the equipment through the heat exchange pipeline 83 and the heat exchange water inlet 11 , and then passes through the flow sensor 32 , the bypass pipeline 361 and the connection of the heating return water pipeline 371 and enter the cold water pipeline 41 via the water pump 31. In this embodiment, the pressure sensor 33 and the pressure relief valve 35 are both located in the heating water outlet pipeline 372 to detect the pressure in the heating circuit, and can automatically release the pressure when the pressure is too high.

The electronically controlled three-way valve 34 is arranged between the hot water pipeline 42 , the heating water outlet pipeline 372 , and the heat exchange pipeline 81 , and can be controlled to actuate the hot water outlet 421 of the hot water pipeline 42 . Alternatively, it is in liquid communication with the heat exchange water outlet 12 and the heating water outlet pipeline 372 . When the gas boiler 100 works in the heat exchange mode, that is, when it is used to heat the water stored in the water tank 90, the electronically controlled three-way valve 34 is actuated to make the hot water outlet 421 communicate with the heat exchange outlet 12, and make the The water path to the heating water outlet pipe 372 is disconnected; and when the gas boiler 100 is in the heating mode, the electronically controlled three-way valve 34 is actuated to make the hot water outlet 421 communicate with the passage leading to the heating water outlet pipe 372, And block the water path leading to the heat exchange water outlet 12, so as to keep the water circulation in the heating circuit smooth. The electronically controlled three-way valve can be driven by a motor.

The water circuit assembly further includes a one-way valve 362 disposed in the bypass pipe 361 , so that the water flow can only flow in one direction from the heating water outlet pipe 372 to the heating water return pipe 371 . Furthermore, the one-way valve has a specific cracking pressure, with this arrangement, the bypass line 361 will only open when the pressure in the heating circuit is higher than this cracking pressure. As shown by the arrows in FIG. 4 , when the device works in the heating mode, the bypass line 361 is opened due to excessive pressure in the heating circuit due to valve closure or blockage. The hot water flowing out of the hot water pipeline 42 passes through the electronically controlled three-way valve 34 and flows into the bypass pipeline 361, and then enters the cold water pipeline 41 through the water pump. Because the bypass pipeline is directly erected between the heating return water pipeline and the heating water outlet pipeline, while ensuring the heating water bypass function, it can also prevent the heating water from entering the heat exchange pipeline and heating the water in the external water tank.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention may be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments are to be considered in all respects as exemplary and not restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is therefore intended that the All changes within the meaning and range of the required equivalents are embraced within the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (8)

1. A gas boiler (100) comprising a casing (10), a burner (21), a heat exchanger (22) housed in the casing, and a waterway assembly (30) mounted on a bottom plate of the casing; the water path component comprises a heating water return pipeline (371) and a heating water outlet pipeline (372), wherein the heating water return pipeline extends out of the bottom plate of the shell, a heating water return port (13) is formed at the tail end of the heating water return pipeline, a heating water outlet (14) is formed at the tail end of the heating water outlet pipeline, and the heating water return port and the heating water outlet can be connected with an external radiator through a pipeline to form a heating loop; the method is characterized in that: the water path component also comprises a bypass pipeline (361) connected between the heating water return pipeline and the heating water outlet pipeline, so that certain water flow can still be ensured to flow through the bypass pipeline when the heating loop is closed or blocked.

2. A gas boiler according to claim 1, characterized in that: the waterway assembly further includes a check valve (362) provided in the bypass line so that water flows only in one direction from the heating water outlet line (372) to the heating water return line (371).

3. A gas boiler according to claim 2, characterized in that: the one-way valve has an opening pressure.

4. A gas boiler according to claim 1 or 2, characterized in that: the boiler further comprises a cold water line (41) arranged in the housing upstream of the heat exchanger and a hot water line (42) arranged downstream of the heat exchanger, and a water pump (31) arranged in the cold water line.

5. The gas boiler according to claim 4, characterized in that: and the joint of the bypass pipeline and the heating water return pipeline is positioned at the upstream of the water pump.

6. The gas boiler according to claim 4, characterized in that: the waterway assembly is also provided with a heat exchange water inlet (11) and a heat exchange water outlet (12) which are protruded out of the bottom plate of the shell so as to be connected with heat exchange pipelines (81, 82, 83) passing through an external water tank (90).

7. The gas boiler of claim 6, wherein: the waterway assembly further comprises an electric control three-way valve (34) which can be controlled to enable a hot water outlet (421) of the hot water pipeline (42) to be alternatively communicated with the heat exchange water outlet (12) and a heating water outlet pipeline (372) in a liquid mode.

8. The gas boiler of claim 6, wherein: the heat exchange water inlet (11) is in liquid communication with the bypass pipeline.

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