CN211625686U

CN211625686U - Gas boiler with bypass function

Info

Publication number: CN211625686U
Application number: CN201921038431.1U
Authority: CN
Inventors: 袁可梦; 高如国
Original assignee: Vaillant Wuxi Heating Equipment Co Ltd
Current assignee: Vaillant Wuxi Heating Equipment Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-10-02
Anticipated expiration: 2029-06-28

Abstract

The utility model provides a gas boiler, it includes the shell, accommodates combustor, heat exchanger in the shell to and install the water route subassembly on the shell bottom plate. The water path component comprises a heating water return pipeline and a heating water outlet pipeline, the heating water return pipeline and the heating water outlet pipeline extend out of the bottom plate of the shell, a heating water return port is formed at the tail end of the heating water return pipeline, a heating water outlet 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 pipelines to form a heating loop. The water channel component also comprises a bypass pipeline 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. Because the bypass pipeline is directly erected between the heating water return pipeline and the heating water outlet pipeline, the heating water bypass function is ensured, and meanwhile, the heating water is prevented from entering the heat exchange pipeline to heat the water in the external water tank.

Description

Gas boiler with bypass function

Technical Field

The utility model relates to a gas boiler, concretely relates to gas boiler's heating water bypass mechanism.

Background

The domestic gas boiler includes a dual-purpose furnace and a system furnace. The dual-purpose furnace can be used for providing domestic hot water independently and can also be communicated with a radiator arranged indoors to provide a heating function; the system furnace can be used with an external water storage tank to provide domestic hot water on the one hand, and can be used with a radiator to provide a heating function on the other hand. When the system furnace is used, a situation that a valve of a heating loop is manually closed or a heating pipeline is blocked under a special condition can occur, the situation can cause water in a heating circulation system to stop flowing, but a combustion and heat exchange system still works, such as dry combustion and gasification, so that equipment is damaged. In the existing system furnace, a bypass pipeline is erected between a heating pipeline and a heat exchange pipeline leading to a water storage tank, so that when a heating loop is blocked, heating water flows into the heat exchange loop through the bypass pipeline to heat water in the water storage tank. However, at this time, heating water in the water storage tank is not desired by a user, so when the user opens the faucet and wants to use domestic water, the outlet water temperature is high, which may cause scalding of the user, obviously, this undoubtedly causes poor use experience for the user.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a gas boiler, it can provide the bypass function of heating water, can avoid the water heating in the external water storage tank again simultaneously.

In order to achieve the above object, the present invention provides a gas boiler, which comprises a housing, a burner and a heat exchanger housed in the housing, and a water path assembly installed on a bottom plate of the housing. The water path component comprises a heating water return pipeline and a heating water outlet pipeline, the heating water return pipeline and the heating water outlet pipeline extend out of the bottom plate of the shell, a heating water return port is formed at the tail end of the heating water return pipeline, a heating water outlet 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 pipelines to form a heating loop. The water channel component also comprises a bypass pipeline 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.

As a further improvement of the utility model, the water route subassembly is still including setting up the check valve in the bypass pipeline to make rivers only can follow heating outlet pipeline to the one-way flow of heating return water pipeline.

As a further improvement of the present invention, the check valve has a specific opening pressure.

As a further improvement of the present invention, the boiler further comprises a cold water pipeline disposed in the casing and located at the upstream of the heat exchanger, a hot water pipeline located at the downstream of the heat exchanger, and a water pump disposed in the cold water pipeline.

As a further improvement of the utility model, the junction of the bypass pipeline and the heating return water pipeline is positioned at the upper reaches of the water pump.

As a further improvement, the water path assembly further has a heat exchange water inlet and a heat exchange water outlet protruding outside the housing bottom plate to be connected with the heat exchange pipeline through the external water tank.

As a further improvement, the waterway assembly further comprises an electric control three-way valve which can be controlled to alternatively communicate with the heat exchange water outlet and the heating water outlet pipeline liquid by actuating the hot water outlet of the hot water pipeline.

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

Compared with the prior art, the beneficial effects of the utility model are that: because the bypass pipeline is directly erected between the heating water return pipeline and the heating water outlet pipeline, the heating water bypass function is ensured, and meanwhile, the heating water is prevented from entering the heat exchange pipeline to heat the water in the external water tank.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings related to the present invention in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a perspective view of a gas boiler according to an embodiment of the present invention;

FIG. 2 is a schematic plan view of the gas boiler shown in FIG. 1 with the front panel removed;

FIG. 3 is a perspective view of the waterway assembly of the gas boiler shown in FIG. 2, after the waterway assembly is connected to the base plate;

fig. 4 is a schematic view illustrating an operation of the gas boiler shown in fig. 1 after being connected to an external water tank.

Detailed Description

The present invention will be described in detail below with reference to embodiments shown in the drawings. However, these embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art based on these embodiments are all included in the scope of the present invention.

The gas boiler uses combustible gas as fuel, such as natural gas, city gas, liquefied gas, methane and the like, and heats water by burning the combustible gas so as to meet the requirements of central heating and/or domestic water of users.

Referring to fig. 1 to 4, a gas boiler according to an embodiment of the present invention and a heating system in which the gas boiler is connected to an external water tank. The gas boiler 100 includes a casing 10, a burner and heat exchanger assembly 20, a water path assembly 30, an expansion tank 50, etc. accommodated in the casing 10.

In the present embodiment, the housing 10 is substantially rectangular, and may be formed by splicing a plurality of panels, such as a front panel, a back panel, a top panel, a bottom panel, and a pair of side panels. The housing 10 may be mounted to a wall with the back panel facing the wall.

The burner and heat exchanger assembly 20 generally includes a burner housing, and a burner 21 and a heat exchanger 22 housed within the housing. The burner 21 typically includes a burner unit, such as a plurality of fire fins (not shown) arranged side-by-side. Each fire row piece is provided with a gas-air mixing channel, and gas and primary air conveyed through a gas conveying pipeline 15 are mixed in the mixing channel and are transferred to fire holes at the top of the fire row piece to be combusted and generate hot smoke. Since the construction and arrangement of fire flaps are well known to those skilled in the art, applicant is not repeated here. The heat exchanger 22 is disposed above the burner 21. The heat exchanger may be a finned tube heat exchanger, i.e. a plurality of fins are arranged in the heat exchanger shell, and a heat absorption water pipe (not shown) is circuitously passed through the fins, and both ends of the heat absorption water pipe are respectively communicated with the cold water pipe 41 at the upstream and the hot water pipe 42 at the downstream. The gas-air mixture is combusted in the combustion chamber defined by the combustion housing, the generated heat is absorbed by the fins and further transferred to the water flowing through the heat absorption water pipe, and the heated water flows out through the hot water outlet 421 of the hot water pipe 42.

The expansion tank 50 generally includes a housing, a gas storage chamber, a liquid storage chamber, and an elastic diaphragm separating the gas storage chamber and the liquid storage chamber formed in the housing. When the pressure in the heating water pipeline is overlarge, 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 3, the waterway assembly 30 is installed on the bottom plate of the housing, and includes a heating water return line 371 and a heating water outlet line 372 extended out of the bottom plate of the housing; wherein, a heating water return port 13 is formed at the end of the heating water return line 371, and a heating water outlet port 14 is formed at the end of the heating water outlet line 372. The heating water return port 13 and the heating water outlet port 14 are protruded outside the bottom plate of the housing to be connected with an external radiator (not shown) through a pipe to form a heating loop. The waterway assembly 20 further includes a heat exchange water inlet 11 and a heat exchange water outlet 12 protruded outside the bottom plate of the housing to be connected with the

heat exchange pipes

81, 82, 83 passing through the external water tank 90, respectively. Referring also to fig. 4, heat exchange line 82 forms a coil within water tank 90 to increase the heat exchange area. The water in the main water pipe enters the water tank 90 through the water inlet pipe 91, then absorbs the heat emitted from the coil pipe 82, and finally discharges the hot water for daily use through the water outlet pipe 92 for drinking, washing, bathing, and the like.

The waterway assembly 30 includes a water pump 31, a flow sensor 32, a pressure sensor 33, an electric control three-way valve 34, a pressure release valve 35, and a bypass line 361, which are disposed at a water inlet side, and are connected between the water inlet side and the water outlet side of the waterway assembly, and further connected (waterway-connected) to a heating water return line 371 and a heating water outlet line 372. By providing the bypass line 361 between the heating water return line 371 and the heating water outlet line 372, a certain amount of water flow can be ensured to flow through the bypass line even when the heating circuit is closed or blocked. The heat exchange water inlet 11 is in fluid communication with the bypass line 361.

The water pump 31 is connected to the cold water line 41 through the water inlet 411, and a connection point of the bypass line 361 and the heating water return line 371 is located upstream of the water pump 31. Referring to fig. 4, the cooled water after heat exchange enters the apparatus through the heat exchange pipe 83 and the heat exchange water inlet 11, and then enters the cold water pipe 41 through the flow sensor 32, the junction between the bypass pipe 361 and the heating water return pipe 371, and the water pump 31. In this embodiment, the pressure sensor 33 and the pressure release valve 35 are both located in the heating water outlet conduit 372, and are used for detecting the pressure in the heating circuit, and can automatically release the pressure when the pressure is too high.

The electrically controlled three-way valve 34 is disposed between the hot water line 42, the heating water outlet line 372, and the heat exchange line 81, and is controlled to alternately connect the hot water outlet 421 of the hot water line 42 to the heat exchange water outlet 12 and the heating water outlet line 372. When the gas boiler 100 is operated in the heat exchange mode, that is, when the gas boiler is used for heating water stored in the water tank 90, the electric control three-way valve 34 is actuated to communicate the hot water outlet 421 with the heat exchange water outlet 12 and disconnect the water path leading to the heating water outlet conduit 372; when the gas boiler 100 is operated in the heating mode, the electric control three-way valve 34 is actuated to communicate the hot water outlet 421 with the passage leading to the heating water outlet conduit 372 and block the water passage leading to the heat exchange water outlet 12, so that the water circulation in the heating loop is kept smooth. The electrically controlled three-way valve may be motor driven.

The waterway assembly further includes a check valve 362 provided in the bypass line 361 such that the water flows only in one direction from the heating water outlet line 372 to the heating water return line 371. Furthermore, the non-return valve has a certain opening pressure, by which the bypass line 361 is opened only when the pressure in the heating circuit is above this opening pressure. When the apparatus is operating in heating mode, the heating circuit is under excessive pressure due to the valve being closed or blocked, causing the bypass line 361 to open, as indicated by the arrow in fig. 4. The hot water flowing out of the hot water line 42 passes through the electrically controlled three-way valve 34 and then flows into the bypass line 361, and then enters the cold water line 41 again through the water pump. Because the bypass pipeline is directly erected between the heating water return pipeline and the heating water outlet pipeline, the heating water bypass function is ensured, and meanwhile, the heating water is prevented from entering the heat exchange pipeline to heat the water in the external water tank.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

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.