RU2531717C1 - Expansion tank for gas water heater - Google Patents

Abstract

FIELD: power engineering.

SUBSTANCE: invention relates to thermal power engineering and may be used in gas water heaters of any type that heat water and have expansion tanks. An expansion tank for a gas water heater may be made with low costs due to its simple design and may have high resistance to pressure and high corrosion resistance in case of heating water action. The expansion tank includes a body having an upper part and a lower part, which are open, and comprising a latticed unit for the reception of heating water, separated into compartments by means of multiple diaphragms, receiving heating water and made as a whole with multiple diaphragms; and an upper inner cover and a lower inner cover, which are connected to the body to close the upper part and the lower part of the body.

EFFECT: improved design.

11 cl, 8 dwg

Description

Technical field

The present invention relates to an expansion tank for a gas water heater and, more particularly, to an expansion tank for a gas water heater, which can be easily manufactured at low cost due to its simple internal structure and can have high pressure resistance and high corrosion resistance when the pressure of the heating water changes.

State of the art

Typically, gas water heaters are divided into open-type gas water heaters and closed-type gas water heaters. Open-type gas water heaters are designed so that the heating water in the expansion tank is open to environmental influences, and closed-type gas water heaters are such that the heating water in the expansion tank is isolated from the external environment.

1 schematically illustrates a conventional gas water heater including an open expansion tank.

A conventional open-type gas water heater includes a circulation pump 10, which circulates the heating water, a main heat exchanger 20, which transfers heat energy from the burner 21 to the heating water transported by the circulation pump 10, a three-way valve 30, which supplies the heating water to the heating pipe to be heated during the heating operation, and supplies heating water to the hot water heat exchanger 40 when performing the hot water supply operation, heat exchange a hot water tank 40, which heats cold water and supplies hot water during the hot water supply operation, and an expansion tank 50 that stores return heating water and which absorbs pressure changes as the temperature of the heating water changes.

Reference numeral 61 denotes a heating water supply pipe, reference 62 denotes a heating water return pipe, reference 63 denotes a cold water pipe, and reference 64 denotes a hot water pipe.

An expansion tank 50, which is designed so that the heating water is open to environmental influences, includes a level sensor 51 for detecting whether the level of heating water in the expansion tank is within a predetermined range and an overflow pipe 52 located on the upper side part of the expansion tank 50, which allows the heating water to flow out if the heating water level exceeds a predetermined level.

A conventional open-type gas water heater can be easily manufactured at low cost due to its simple design. However, since the heating water circulation system is open to environmental influences and, therefore, cannot be located below the heating pipeline that needs to be heated, there are restrictions on the installation location of the heating water circulation system. In addition, since the heating water is open to environmental influences and, as a result, oxygen enters the expansion tank 50, there is a risk of corrosion for the heating pipe.

Figure 2 schematically illustrates a conventional gas water heater, including a closed expansion tank.

A conventional closed-type gas water heater, like a conventional open-type gas water heater, includes a circulation pump 10, a main heat exchanger 20, a burner 21, a three-way valve 30 and a hot water heat exchanger 40, and differs from a conventional open-type gas water heater in that the expansion tank 70 is closed from environmental influences, and a conventional closed-type gas water heater further includes a water and gas separator 71, an overpressure safety valve 72, and a pressure system 73.

An expansion tank 70, which is designed so that the heating water is protected from outside air, includes a rubber plate 70a and a gas storage unit 70b that is filled with gas (e.g. nitrogen), and a heating water storage unit 70c in which heating water is stored, wherein the gas storage unit 70b and the heating water storage unit 70c are configured such that a rubber plate 70a is located between them. The rubber plate 70a absorbs the pressure change of the heating water by deforming it in accordance with the pressure applied thereto.

A conventional closed-type gas water heater has no restrictions on its installation location, unlike a conventional open-type gas water heater and can prevent oxygen from entering the heating water due to the fact that the circulation system for heating water is closed from the external environment. However, since the pressure of the gas filling the gas storage unit 70b is used to absorb the pressure change of the heating water, the performance of a conventional closed-type gas water heater may deteriorate when it is operated for a long time. Since a conventional closed-type gas water heater includes a complex structure for filling it with gas, it cannot be easily manufactured at low cost. Since a conventional closed-type gas water heater is made of steel, it is at risk of corrosion.

Since the open expansion tank 50 has drawbacks, such as restrictions on the installation site and the risk of corrosion of the heating water pipe, and the closed expansion tank 70 has drawbacks, such as complex construction, manufacturing complexity and high manufacturing costs, there is a need for expansion a tank that can overcome the disadvantages of conventional expansion tanks 50 and 70.

SUMMARY OF THE INVENTION

Technical problem

The aim of the present invention is to provide an expansion tank for a gas water heater, which can be easily manufactured at low cost due to its simple internal structure and which can have high pressure resistance and high corrosion resistance when the pressure of the heating water changes.

Technical solution

According to one aspect of the present invention, there is provided an expansion tank for a gas water heater including a housing having an upper part and a lower part that are open, and including a trellis unit for receiving heating water, divided into compartments by a plurality of diaphragms, receiving heating water and made in one piece with many diaphragms; and an upper inner cover and a lower inner cover, which are connected to the housing to close the upper part and the lower part of the housing.

The upper outer cover may be attached to the inside of the upper inner cover, and the lower outer cover may be attached to the lower part of the lower inner cover.

The lattice block for receiving the heating fluid may have such a shape that the outer surface of the body part, divided into compartments by a plurality of diaphragms, is curved outward.

The housing, including the grating unit for receiving the heating water, the upper inner cover and the lower inner cover, are made of plastic material, and the upper outer cover and the lower outer cover can be made of steel.

The protruding outward flanges located vertically one on top of the other can be formed on the edge of the upper end of the housing, the lower end of the upper inner cover and the lower end of the upper outer cover; outwardly projecting flanges arranged vertically one on top of the other can be formed on the edge of the lower end of the housing, the upper end of the lower inner cover and the upper end of the upper inner cover; and a plurality of bolts may extend at equal intervals through flanges from flanges formed on the upper outer cover to flanges formed on the lower outer cover, and nuts may be screwed onto the ends of the plurality of screws.

An upper support plate and a lower support plate arranged horizontally can be provided respectively in the upper part and the lower part of the housing, and flanges can be formed on the upper end and lower end of the grating unit for receiving heating water, which can be snugly inserted into openings formed in the upper support plate and the lower support plate.

The upper support plate and the lower support plate may be made of plastic material.

The upper support plate may include upper means of communication, which are located at a position offset a predetermined distance in the downward direction from the upper end of the housing, and are located between the upper support plate and the upper inner cover, and the lower support plate may include lower means of communication which are positioned at a predetermined distance upward from the lower end of the housing and are located between the lower support plate and the lower inner a lid, wherein the compartments of the grating unit for receiving the heating water communicate with each other by means of upper communication means and lower communication means.

The protruding elements that fit snugly when connected to the inner circumferential surface of the housing can be respectively formed on the lower end of the upper inner cap and the upper end of the lower inner cap, and o-rings can be placed between the outer circumferential surfaces of the protruding elements and the inner circumferential surface of the housing.

The upper inner cover and the upper outer cover can be bent in the upward direction, and the lower inner cover and the lower outer cover can be bent in the downward direction.

The expansion tank may further include a gas / water separator, a water level sensor, and an overpressure safety valve that are located on the housing.

Beneficial effects

Since in the expansion tank for a gas water heater according to the present invention, the housing, the upper and lower inner caps in contact with the heating water are made of plastic material, corrosion resistance can be improved. Due to the fact that the upper and lower outer covers are made of steel, the housing, the upper and lower inner covers and the upper and lower outer covers are connected to each other using bolts and nuts, and the trellis block for receiving heating water made of plastic material is placed in housing, it is possible to withstand the rapid change in the pressure of the heating water and damage due to expansion can be prevented.

In addition, in the case where the expansion tank includes a gas / water separator, a water level sensor and an overpressure relief valve, since the expansion tank has an open configuration when the level of heating water is equal to or less than the set level, and changes the configuration closed when the level of heating water exceeds a predetermined level, it is possible to eliminate the risk of corrosion of the heating pipe caused by the penetration of oxygen into the expansion tank from the external environment. Also, since water level is detected in the expansion tank, it can be easily determined whether heating water needs to be replenished. Due to the fact that the pressure is adjusted to a suitable value using an overpressure safety valve, when the pressure in the expansion tank rapidly increases, damage to the expansion tank can be prevented.

Brief Description of the Drawings

1 is a schematic view illustrating a conventional gas water heater including an open expansion tank.

FIG. 2 is a schematic view illustrating a conventional gas water heater including a closed expansion tank.

3 is a front view illustrating an expansion tank for a gas water heater according to an embodiment of the present invention.

Figure 4 is a perspective view with a spatial separation of parts, illustrating the expansion tank in figure 3.

FIG. 5 is a perspective view illustrating a trellis unit for receiving heating water disposed in the housing of the expansion tank in FIG. 4.

6 is a view in section along the line aa of the housing of the expansion tank in figure 4.

Fig.7 is a sectional view along the line BB of the casing of the expansion tank in Fig.4.

8 is a front view illustrating an expansion tank for a gas water heater according to another embodiment of the present invention.

Description of Reference Positions

10 circulation pump

20 main heat exchanger

21 burner

30 three-way valve

40 heat exchanger for hot water

50, 70, 100, 200 expansion tank

51 water level sensor

52 overflow pipe

61 heating water pipe

62 pipe for return heating water

63 pipe for cold water

64 pipe for hot water

70a rubber plate

70b gas storage unit

70s block for storing heating water

71 gas / water separator

72 pressure relief valve

73 pressure system

110 building

111, 113, 121, 131, 141, 151 flange

112, 114, 122, 132, 142, 152 connecting hole

115 grating unit for receiving heating water

115a case

115b, 115c flange

115d, 115e, 115f, 115g aperture

116 upper support plate

117 bottom support plate

118 top means of communication

119 lower means of communication

120 top inner cover

124, 144 protruding element

125, 145 o-ring

130 top outer cover

140 bottom inner cover

150 bottom outer cover

161 bolt

162 nut

210 gas / water separator

220 water level sensor

230 pressure relief valve

Description of Embodiments

The present invention will now be described in more detail with reference to the accompanying drawings, in which examples of embodiments of the invention are shown.

3 is a front view illustrating an expansion tank 100 for a gas water heater according to an embodiment of the present invention. Figure 4 presents a perspective view with a spatial separation of the parts of the expansion tank in figure 3. FIG. 5 is a perspective view illustrating a trellis unit 115 for receiving heating water housed in the housing 110 of the expansion tank 100 in FIG. 4. FIG. 6 is a sectional view taken along line AA of the housing 110 of the expansion tank 100 in FIG. 4. FIG. 7 is a sectional view taken along line BB of the housing 110 of the expansion tank 100 in FIG. 4.

Referring to FIG. 3, the expansion tank 100 includes a housing 110 having a cylindrical shape including a grating unit 115 for receiving heating water disposed therein, an upper inner cover 120 connected to the housing 110 in such a way as to cover the upper part of the housing 110, the upper outer cover 130 connected to the upper inner cover 120 so that it fits snugly against the upper part of the upper inner cover 120, the lower inner cover 140 connected to the housing 110 so as to close the lower part orpusa 110 and the lower outer cover 150 coupled to the lower inner lid 140 so that it fits tightly to the bottom of the lower inner lid 140, and which includes an inlet pipe 171 for return heating water and the outlet tube 172 for return heating water. The connection of these elements with each other is carried out using bolts 161 and nuts 162.

Since the housing 110, including the trellis block 115 for receiving heating water, the upper inner cover 120 and the lower inner cover 140 are made of plastic material, even when the housing 110, the upper inner cover 120 and the lower inner cover 140 are in contact with the heating water stored in the expansion tank 100, there is no risk of corrosion.

However, if all the elements of the expansion tank 100 are made of plastic material, then with increasing pressure of the heating water contained in the expansion tank 100, the expansion tank 100 may not withstand the water pressure and may be damaged. Therefore, to increase the resistance of the expansion tank 100 to water pressure, the upper outer cover 130 and the lower outer cover 150, which do not come in contact with heating water, are made of steel.

Next, the connection structure of the expansion tank 100 will be described in more detail with reference to FIG.

The housing 110 is cylindrical in shape, and the upper and lower parts of the housing 110 are open. As shown in FIGS. 5-7, the trellis unit 115 for receiving heating water, having a trellis shape, to withstand the increase in pressure of the heating water by distributing pressure, is housed in the housing 110, and the outwardly extending flanges 111 and 113 form the edge portions of the upper and lower ends housing 110.

The upper inner cover 120 and the lower inner cover 140 have the same shape and are symmetrically attached to the upper and lower parts of the housing 110, respectively. The upper outer cover 130 and the lower outer cover 150 have the same shape and are symmetrically attached to the upper part of the upper inner cover 120 and the lower part of the lower inner cover 140, respectively.

The upper inner cover 120 and the upper outer cover 130 have a “hat-shaped” shape in which an empty space is formed and are curved upward. The lower inner cover 140 and the lower outer cover 150 are bent downward, symmetrically to the upper inner cover 120 and the upper outer cover 130.

The protruding flanges 121 and 131 are formed on the edge of the lower end of the upper inner cover 120 and the lower end of the upper outer cover 130. The flange 121 of the upper inner cover 120 and the flange 131 of the upper outer cover 130 are successively arranged on top of each other on a flange 111 formed at the upper end housing 110.

Similarly, the protruding outward flanges 141 and 151 are formed on the edge portion of the upper end of the lower inner cover 140 and the upper end of the lower outer cover 150. The flange 141 of the lower inner cover 140 and the flange 151 of the lower outer cover 150 are successively arranged one on top of the other under the flange 113 formed on lower end of housing 110.

The protruding element 124, which protrudes in a downward direction, is formed on the lower end of the upper inner cover 120 and fits snugly against the inner circumferential surface of the upper part of the housing 110. The protruding element 144, which protrudes in the upward direction, is formed on the upper end of the lower inner cover 140 and adjacent to the inner circumferential surface of the lower part of the housing 110.

O-rings 125 and 145 are located on the outer circumferential surfaces of the protruding elements 124 and 144 to provide a tight seal between the outer circumferential surfaces of the protruding elements 124 and 144 and the inner circumferential surface of the housing 110.

A plurality of connecting holes 132, 122, 112, 114, 142 and 152 are formed at equal intervals in the flanges 131, 121, 111, 113, 141 and 151, respectively, bolts 161 are sequentially inserted into the connecting holes 132, 122, 112, 114, 142 and 152, and nuts 162 are screwed onto the ends of the bolts 161 so that the upper inner cover 120 and the upper outer cover 130 are connected to the upper part of the housing 110, and the lower inner cover 140 and the lower outer cover 150 are connected to the lower part of the housing 110.

Next, the internal structure of the housing 110 will be described with reference to FIGS. 5-7.

In the housing 110, there is a grating unit 115 for receiving heating water, in which the interior of the housing part 115a is divided into compartments by a plurality of diaphragms 115d, 115e, 115f and 115g to withstand the increase in pressure of the heating water by distributing the pressure of the heating water. The protruding outward flanges 115b and 115c, respectively, are formed at the upper end and lower end of the body portion 115a.

Since the grating unit 115 for receiving heating water is made of plastic material and the outer surface of the housing 115a has an outwardly curved shape, the pressure received in the heating water compartments distributed by the diaphragms 115d, 115e, 115f and 115g can be uniformly distributed outward.

In the upper and lower parts of the housing 110, horizontally arranged upper support plate 116 and a lower support plate 117 made of plastic material are provided, and the side surfaces of the upper support plate 116 and the lower support plate 117 are attached to the inner circumferential surface of the housing 110. In the upper support plate 116 and lower support plate 117, holes are formed whose dimensions correspond to the shape of flanges 115b and 115c formed at the upper end and lower end of the mesh unit 115 for receiving heating water, and flanges 115b and 115c of grating unit 115 for receiving heating water are tightly inserted into these openings.

Since the upper supporting plate 116 and the lower supporting plate 117 are arranged horizontally in the housing 110 and the grating unit 115 for receiving heating water is disposed between them and connected to them in a vertical direction and thereby the housing 110, the upper supporting plate 116, the lower supporting plate 117 and the grating unit 115 for receiving water, placed in the housing, each of which is made of plastic material, mutually support each other, it is possible to withstand the heating pressure water stored in the housing 110.

The upper support plate 116 is located at a position offset a predetermined distance in a downward direction from the upper end of the housing 110, and the lower support plate 117 is located at a position offset at a predetermined distance in an upward direction from the lower end of the housing 110.

Accordingly, when the expansion tank 100 is assembled, the upper communication means 118 are formed between the upper supporting plate 116 and the upper inner cover 120, and the lower communication means 119 are formed between the lower supporting plate 117 and the lower inner cover 140 and thereby the grating unit 115 for receiving heating water communicates with the upper means of communication 118 and the lower means of communication 119 in the housing 110.

Also, by forming the upper communication means 118 and the lower communication means 119, spaces are provided into which protruding elements 124 and 144 formed at the lower end of the upper inner cover 120 and the upper end of the lower inner cover 140 are inserted adjacent to the inner circumferential surface of the housing 110.

Although the body portion 115a of the grating unit 115 for receiving heating water has an outer surface that looks like a plurality of convex cylindrical elements intersecting each other, this does not limit the present invention. The housing 115a may have any other shape, provided that it is possible to divide its interior space by diaphragms in order to withstand water pressure and distribute water pressure. It is also understood that the number of compartments is not limited to that shown in FIG. 5 and may be different.

FIG. 8 is a front view illustrating an expansion tank 200 for a gas water heater according to another embodiment of the present invention. The expansion tank 200, in addition to the housing 110 of the expansion tank 100, includes a gas / water separator 210, a water level sensor 220, and an overpressure safety valve 230.

The gas / water separator 210 for preventing corrosion of the heating pipe by leading the air enclosed in the heating water to the outside from the expansion tank 200 is configured so that the ventilation opening in communication with the air is opened and closed in accordance with a change in the water level in the expansion tank 200.

Accordingly, when the level of heating water in the expansion tank 200 is equal to or less than the set, the expansion tank 200 has an open configuration, and when the level of the heating water in the expansion tank 200 is higher than the set, the expansion tank 200 goes into a closed configuration.

The water level sensor 220 provides the ability to determine the need for replenishment of the heating water by the fact that it allows the user to easily recognize the level of heating water stored in the expansion tank 200.

When the temperature of the heating water increases and as a result, the pressure in the expansion tank 200 rapidly increases, the overpressure safety valve 230 automatically opens. The overpressure relief valve 230 may be located on the side of the upper part of the housing 110 and may maintain the pressure in the expansion tank 200 at a suitable level or less than this level by letting out air compressed in the expansion tank 200.

According to the present embodiment, the pressure change in the expansion tank 200 can be controlled using a gas / water separator 210 and an overpressure safety valve 230, and the need for replenishment of the heating water can be easily determined using the water level sensor 220.

Claims (11)

1. An expansion tank for a gas water heater, comprising a housing having an upper part and a lower part that are open, and comprising a trellis unit for receiving heating water, divided into compartments by a plurality of diaphragms, receiving heating water and made in one piece with a plurality of diaphragms; and
the upper inner cover and the lower inner cover, which are connected to the housing to cover the upper part and the lower part of the housing. 2. The expansion tank according to claim 1, in which the upper outer cover is attached to the upper part of the upper inner cover and the lower external cover is attached to the lower part of the lower inner cover. 3. The expansion tank according to claim 1, in which the grating unit for receiving heating water has such a shape that the outer surface of the body part, divided into compartments by means of multiple diaphragms, is curved outward. 4. The expansion tank according to claim 2, in which each of the housing, including the trellis block for receiving heating water, the upper inner cover and the lower inner cover are made of plastic material, and each of the upper outer cover and the lower outer cover are made of steel. 5. The expansion tank according to claim 2, in which the protruding outward flanges, located vertically one on top of the other, are formed on the edge of the upper end of the housing, the lower end of the upper inner cover and the lower end of the upper outer cover,
outwardly projecting flanges arranged vertically on top of one another are formed on an edge portion of a lower end of the housing, an upper end of a lower inner cover and an upper end of a lower outer cover,
and a plurality of bolts extend right at regular intervals from flanges formed on the upper outer cover to flanges formed on the lower outer cover, and nuts are screwed onto the ends of the plurality of bolts. 6. The expansion tank according to claim 1, in which in the upper part and the lower part of the housing respectively there is an upper support plate and a lower support plate arranged horizontally, and flanges formed at the upper end and lower end of the grating unit for receiving heating water are tightly inserted into the openings formed in the upper support plate and the lower support plate. 7. The expansion tank according to claim 6, in which the upper supporting plate and the lower supporting plate are made of plastic material. 8. The expansion tank according to claim 6, in which the upper supporting plate contains upper means of communication located in a position offset by a predetermined distance in the downward direction from the upper end of the housing and located between the upper supporting plate and the upper inner cover, and the lower supporting plate contains lower communication means located in a position offset by a predetermined distance upward from the lower end of the housing and located between the lower supporting plate and the lower inner her lid
wherein the compartments of the grating unit for receiving the heating water communicate with each other by means of the upper communication means and the lower communication means. 9. The expansion tank according to claim 8, in which protruding elements are formed on the lower end of the upper inner cover and the upper end of the lower inner cover, and sealing rings are located between the outer circumferential surfaces of the protruding elements and the inner circumferential surface of the housing rings. 10. The expansion tank according to claim 2, in which the upper inner cover and the upper outer cover are curved in the upward direction and the lower inner cover and the lower outer cover are curved in the downward direction. 11. The expansion tank according to any one of claims 1 to 10, wherein the housing further comprises a gas / water separator, a water level sensor and an overpressure safety valve.

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