CN205909529U - Gas boiler with relief valve sealing device - Google Patents

Abstract

The utility model provides a gas boiler, which comprises a shell, a burner accommodated in the shell, a heat exchanger, and a waterway component installed on the bottom plate of the shell. The waterway components include a water inlet module for domestic water and heating water to enter, and a water outlet module for domestic water and heating water to flow out. The water outlet module has a safety valve, which can be selectively communicated with the heating water pipeline, so as to automatically open when the pressure in the heating water pipeline is too high to realize drainage. The safety valve has a drain pipe section protruding downwards, and a positioning pipe fitting is protruded on the bottom plate of the shell, the drain pipe section of the safety valve is accommodated in the positioning pipe fitting, and a sealing gasket is arranged between the drain pipe section and the positioning pipe fitting. The installation of the safety valve can be facilitated and a good seal can be formed between the safety valve and the bottom plate by pre-arranging the positioning pipe fittings on the bottom plate. In addition, the gasket is integrally formed on the positioning pipe, so that in a relatively narrow space, the safety valve can achieve sealing when inserted, so that it is not necessary to correct the position of the gasket by hand to ensure a good sealing effect.

Description

Gas boiler with safety valve seal

technical field

The utility model relates to a gas boiler, in particular to a sealing method for a waterway component of the gas boiler.

Background technique

Domestic gas boilers can be used not only to provide domestic hot water, but also to communicate with radiators installed indoors to provide central heating. There are usually burners, heat exchangers, piping systems, and waterway components inside. The waterway components are usually installed on the bottom plate of the gas boiler, including water pumps, water inlet modules, water outlet modules, plate heat exchangers and other components, which are respectively connected to the heating inlet and outlet, and the bathroom inlet and outlet.

At present, according to the different ways of air intake and smoke exhaust, gas water heating equipment can generally be divided into three types: flue type (OpenFlue), forced exhaust type (Fan Assisted), and balanced type (Balanced Flue). Among them, the oxygen required for the combustion of the flue gas hot water equipment is taken from the room, and the smoke generated by the combustion is discharged to the outside through the flue. When using this kind of equipment, pay attention to the smooth exhaust of the flue, otherwise there will be a safety hazard of flue gas backflow. The forced-exhaust gas-fired hot water equipment is based on the flue type with an added exhaust gas motor. During operation, the flue gas is forced to be exhausted to the outside through the flue, but the oxygen required for combustion is still taken from the room. The biggest feature of the balanced gas hot water equipment is that the equipment's air supply and exhaust system and combustion system are directly connected to the outdoors and completely separated from the indoors. When the equipment is in use, all the air required for combustion is taken from the outside, and then discharged to the outside through the pipeline. The whole process does not consume indoor air at all, and will not cause smoke to pollute the indoor environment. Therefore, the balanced gas water heater can be installed in the toilet or bathroom.

In order to ensure the reliable isolation of the balanced gas hot water equipment from the indoor air, the equipment needs to have good sealing performance to avoid the leakage of gas inside the equipment or the entry of external air into the equipment. The Chinese Utility Model Patent Announcement CN 203771675 U, which the applicant applied for and was authorized earlier, discloses a balanced gas-fired boiler. The gas-fired boiler has a sealed chamber for accommodating burners, main heat exchangers and other components. The sealed cavity contains components involved in combustion, such as burners, main heat exchangers, etc., and is reliably sealed to avoid leakage of gas or waste. However, for condensing gas boilers, because it involves the need to discharge the condensed water in the main heat exchanger to the outside of the equipment, it is impossible to achieve sealing by setting a sealed cavity in the equipment like ordinary gas boilers, but needs to To achieve the sealing of the entire device housing. Since many parts of the waterway assembly installed on the bottom plate of the equipment need to extend through the bottom plate, how to realize the reliable sealing of the waterway assembly on the bottom plate is particularly important for the sealing performance of the entire equipment.

Utility model content

The purpose of the utility model is to provide a gas boiler, which can realize reliable sealing between the safety valve and the bottom plate in the waterway assembly.

In order to achieve the purpose of the above utility model, the utility model provides a gas boiler, which includes a casing, a burner housed in the casing, a heat exchanger, and a waterway assembly installed on the bottom plate of the casing. The waterway components include a water inlet module for domestic water and heating water to enter, and a water outlet module for domestic water and heating water to flow out. The water outlet module has a safety valve, which can be selectively communicated with the heating water pipeline, so as to automatically open when the pressure in the heating water pipeline is too high to realize drainage. The safety valve has a drainage pipe section protruding downwards, and a positioning pipe fitting is protruded on the bottom plate of the shell. The drainage pipe section of the safety valve is accommodated in the positioning pipe fitting, and a sealing gasket is arranged between the drainage pipe section and the positioning pipe fitting.

As a further improvement of the utility model, the positioning pipe is detachably installed on the shell bottom plate.

As a further improvement of the utility model, the positioning pipe has a receiving pipe section and a pair of lugs extending radially from the outer wall of the receiving pipe section, and the pair of lugs are fixed to the bottom plate of the housing by screws.

As a further improvement of the utility model, the sealing pad is integrally formed in the positioning pipe.

As a further improvement of the utility model, the gasket has a flange extending radially from the inner side of its upper part; after the drainage pipe section of the safety valve cooperates with the positioning pipe fitting, the flange of the gasket abuts against the outer wall of the drainage pipe section.

Compared with the prior art, the beneficial effect of the utility model is that the installation of the safety valve can be facilitated and a good seal can be formed between the safety valve and the bottom plate by pre-arranging the positioning pipe fittings on the bottom plate. In addition, the gasket is integrally formed on the positioning pipe, so that in a relatively narrow space, the safety valve can be sealed when inserted, so that it is not necessary to correct the position of the gasket by hand to ensure a good sealing effect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. The drawings of the utility model are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative work.

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

Fig. 2 is a perspective view of the gas-fired boiler shown in Fig. 1 after part of the shell panel is removed;

Fig. 3 is a three-dimensional schematic view after the waterway assembly of the gas boiler shown in Fig. 2 is connected to the bottom plate;

The three-dimensional schematic view of the waterway assembly and the bottom of the bottom plate shown in Figure 4 and Figure 3;

Fig. 5 is a sectional view along the A-A line direction in Fig. 3;

Fig. 6 is a three-dimensional exploded view after the waterway assembly shown in Fig. 5 is separated from the bottom plate;

Fig. 7 is a sectional view along the B-B line direction among Fig. 3;

Fig. 8 is a three-dimensional exploded view of the waterway assembly shown in Fig. 7 after it is separated from the bottom plate.

detailed description

The utility model will be described in detail below in conjunction with various embodiments shown in the accompanying drawings. However, these embodiments do not limit the present utility model, and the structural, method, or functional changes made by those skilled in the art according to these embodiments are all included in the protection scope of the present utility model.

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

Referring to a specific embodiment of the utility model gas boiler shown in Fig. 1 to Fig. 4 . The gas boiler 100 includes a casing 10, a burner and a condensing heat exchanger assembly 20 housed in the casing 10, a gas valve 30, a fan 40, an expansion tank 50, and a waterway module installed at the bottom of the casing 10, a plate heat exchanger device 60, water pump 90, etc.

In this embodiment, the housing 10 is roughly in the shape of a cube, which can be spliced by several panels, such as a front cover 11 , a rear cover 12 , a top plate 13 , a bottom plate 14 , and a pair of side covers 15 . The housing 10 can be mounted on a wall with its rear cover 12 facing the wall.

The condensing heat exchanger can be a heat exchanger composed of spiral flat coils as disclosed in European Patent Publication EP 0 678 186 B. The burner is arranged in the space surrounded by the coil pipe, and the gas delivered by the gas delivery pipeline is controlled by the gas valve 30 to enter the burner for combustion. The gas generated by the combustion passes through the gap between the coils under the action of the fan 40, thereby heating the cold water flowing in the coils. The heated water can be discharged directly through domestic water pipes to provide users with the hot water needed for life, or the heating water passing through the heat exchanger can be heated through the plate heat exchanger 60, so as to be further supplied by the circulation of heating water. Indoor heating.

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

With reference to FIGS. 5 to 8 , the waterway assembly includes a water inlet module 70 and a water outlet module 80 . The water inlet module 70 includes water inlet pipe sections for domestic water and heating water. The domestic water pipe section protrudes from the bottom plate 14 and defines a domestic water inlet 731 . The heating water inlet pipe section 733 communicates with the plate heat exchanger 60 . The waterway assembly also includes a replenishment valve 71, which is used to selectively open and close the channel 732 between domestic water and heating water, so that when the water in the heating water pipeline is insufficient, the replenishment valve can be opened to introduce domestic water into the In the heating water pipeline. As shown in FIG. 7 and FIG. 8 , the replenishment valve includes a body 712 extending lengthwise and a valve rod 713 accommodated in the body. The filling valve body 712 is provided with an internal thread, and the valve stem 713 is provided with an external thread, so that the rotation of the valve stem 713 causes the valve stem to move axially relative to the body, thereby opening or closing the domestic water pipeline and the heating water pipeline. passage between roads. The filling valve body 712 is located above the base plate 14 , and the valve rod 713 partially extends out of the body 712 and further extends through the base plate 14 . A handle 711 is fixedly connected with the valve stem 713 at the bottom of the bottom plate 14 , so that the valve stem 713 can be rotated by controlling the handle 711 at the bottom of the bottom plate 14 . In this embodiment, the end of the valve stem 713 protruding from the lower part of the bottom plate 14 is provided with an internal thread, and a screw 714 can pass through the handle 711 to cooperate with the internal thread of the valve stem 713, thereby fixing the valve stem 713 and the handle 711 connected.

As shown in Fig. 3, Fig. 4, Fig. 7 and Fig. 8, a sealing member 72 is provided at the position of the replenishment valve 70 on the shell bottom plate 14, and the seal member has a central through hole 721 for the replenishment valve 70 to pass through. In this embodiment, the sealing member 72 can be a rubber ring, an annular groove is formed on the edge thereof, and can be snapped into the bottom plate 14 . The valve shaft 713 of the supplementary water valve passes through the through hole 721 of the seal, preferably, the valve shaft 713 is in interference fit with the through hole 721 of the seal. After the replenishment valve 71 is installed on the bottom plate 14, the sealing member 72 is clamped between the handle 711 and the body 712, so that the sealing member 72 can be stretched by the valve shaft 713 without breaking away from the connection with the bottom plate 14. The valve can also ensure a good seal with the bottom plate 14 during its activity. Preferably, the sealing member 72 has a wrinkled portion. With this structure, when the valve shaft 713 moves, the wrinkled portion can be stretched and extended to a large extent, so as to ensure that the sealing member 72 can not only move together with the valve shaft 713, but also It will not be disconnected from the bottom plate 14, thereby ensuring the sealing performance.

As shown in FIGS. 3 to 6 , the water outlet module 80 includes outlet pipelines for domestic water and heating water. Wherein, the heating water outlet pipeline 82 passes through the bottom plate 14 and forms a water outlet 821 . The water outlet module 80 also includes a safety valve 81, which can be selectively communicated with the heating water pipeline 82, so as to automatically open when the pressure in the heating water pipeline is too high to realize drainage. As shown in FIG. 6 , the safety valve has a valve stem 811 and a spring 812 disposed in the valve body. Normally, the spring 812 will press the valve stem 811 so that the valve stem 811 closes the passage between the safety valve 80 and the heating water pipeline 82; , the spring 812 will be further compressed to make the valve stem 811 open the passage between the safety valve 80 and the heating water pipeline 82, so that the heating water can be partially discharged through the safety valve 80 until the water pressure in the heating water pipeline is lower than threshold.

The safety valve 80 has a drain pipe section 813 that protrudes downwards, and the drain pipe section 813 corresponds to the drain port 141 on the bottom plate 14, so that excess water in the heating water pipeline can be discharged out of the machine smoothly. In this embodiment, a positioning pipe 83 is fixedly arranged on the bottom plate at the position of the water outlet 141 . The positioning pipe 83 can be integrally arranged on the bottom plate 14 , and can also be detachably installed on the bottom plate 14 . In this embodiment, the positioning pipe 83 has a receiving pipe section and a pair of lugs 831 extending radially from the outer wall of the receiving pipe section, and a pair of screws (not shown) pass through the lugs to fix the positioning pipe 83 to the shell bottom plate 14 superior. The positioning pipe 83 is made of plastic, and a sealing gasket 832 can be integrally formed on the inner wall of the receiving pipe section of the positioning pipe 83 by injection molding. Preferably, the gasket 832 has a flange 8321 extending radially from the upper inner side thereof. As shown in Figure 5, the drain pipe section 813 of the safety valve is accommodated in the accommodation pipe section of the positioning pipe fitting 83, the gasket 832 is located between the drain pipe section 813 of the safety valve and the positioning pipe fitting 83 to achieve sealing, and the flange 8321 of the gasket It abuts against the outer wall of the drain pipe section 813 to ensure good sealing performance. By pre-setting the positioning pipe fitting 83 on the bottom plate 14, the installation of the safety valve 81 and the formation of a good seal between the safety valve 81 and the bottom plate 14 can be facilitated. Sealing is achieved when the valve is inserted, so there is no need to correct the position of the gasket by hand to ensure a good sealing effect. Of course, in other implementations, the gasket can also be integrally formed outside the drain pipe section 813 of the safety valve 80 .

It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from all points of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to be included in the claims All changes within the meaning and range of equivalents of the required elements are included in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

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

Claims (5)

1. A gas boiler comprising a casing, a burner housed in the casing, a heat exchanger, and a waterway assembly installed on the bottom plate of the casing; wherein the waterway assembly includes a water inlet module for domestic water and heating water to enter, and A water outlet module for domestic water and heating water to flow out; the water outlet module has a safety valve, which can be selectively communicated with the heating water pipeline to automatically open when the pressure in the heating water pipeline is too high to realize drainage; the safety valve The valve has a drainage pipe section protruding downwards; it is characterized in that a positioning pipe is provided on the bottom plate of the housing, and the drainage pipe section of the safety valve is accommodated in the positioning pipe, and between the drainage pipe section and the positioning pipe is provided Gasket. 2. The gas boiler according to claim 1, characterized in that: the positioning pipe is detachably mounted on the shell bottom plate. 3. The gas boiler according to claim 2, characterized in that: the positioning pipe has a receiving pipe section and a pair of lugs extending radially from the outer wall of the receiving pipe section, and the lugs are fixed to the shell bottom plate by screws . 4. The gas boiler according to claim 1 or 2, characterized in that: the sealing gasket is integrally formed in the positioning pipe. 5. The gas boiler according to claim 4, characterized in that: the sealing pad has a flange extending radially from the inner side of its upper part; after the drain pipe section of the safety valve is matched with the positioning pipe, the sealing pad The flange abuts against the outer wall of the drain pipe segment.