CN221005496U - Heat exchanger and water heater - Google Patents

Abstract

The utility model discloses a heat exchanger and a water heater, wherein the heat exchanger comprises a heat exchange tube and a heat exchange plate, the heat exchange plate is used for carrying out heat exchange with the heat exchange tube, and the heat exchange plate is sleeved outside the heat exchange tube; and on the axial projection surface of the heat exchange tube, the minimum distance between any point on the heat exchange plate and the outer tube wall of the heat exchange tube is not more than 3mm. The utility model can improve the heat exchange performance of the heat exchanger and reduce the risk of scalding users due to water cut-off and high temperature rise of water in the heat exchanger.

Description

Heat exchanger and water heater

Technical Field

The utility model relates to the technical field of heat exchange, in particular to a heat exchanger and a water heater.

Background

In the related art, a heat exchanger is a main component of a gas water heater. The existing heat exchanger is unreasonable in structural design, so that the heat exchange performance is affected due to uneven temperature distribution on the heat exchanger, when the existing heat exchanger is started again after water is stopped, the problem of overhigh temperature rise of water in the heat exchanger can occur, and therefore the water outlet temperature of the gas water heater is overhigh to scald users, and the safety of the gas water heater is affected.

Disclosure of utility model

The utility model mainly aims to provide a heat exchanger and a water heater comprising the heat exchanger, and aims to improve the heat exchange performance of the heat exchanger and reduce the risk of scalding users due to excessive water cut-off and temperature rise of water in the heat exchanger.

To achieve the above object, the present utility model provides a heat exchanger, including:

A heat exchange tube; and

The heat exchange plate is used for exchanging heat with the heat exchange tube and sleeved outside the heat exchange tube; and on the axial projection surface of the heat exchange tube, the minimum distance between any point on the heat exchange plate and the outer tube wall of the heat exchange tube is not more than 3mm.

In an embodiment, the heat exchanger further comprises two end plates arranged at intervals and a plurality of heat exchange tubes arranged between the two end plates at intervals along a first direction, each end plate is provided with a plurality of communication parts and a plurality of through holes, the outer periphery of each through hole of the end plate is provided with an annular convex part extending towards the other end plate, the end part of each heat exchange tube is inserted into one annular convex part and is in sealing connection with the annular convex part, each communication part is provided with a communication opening communicated with the through hole, each two heat exchange tubes are communicated through one communication opening of the communication part, and a plurality of heat exchange tubes are communicated through a plurality of communication parts to form a heat exchange channel.

In an embodiment, the communicating portion communicating the two heat exchange tubes is defined as a first communicating portion, a maximum opening width of a communicating opening of the first communicating portion along the first direction is W1, and a maximum width of two annular protruding portions, which are communicated with the first communicating portion, of the two outer sides of the heat exchange tubes along the first direction is W2, where W1 is less than or equal to W2.

In an embodiment, the heat exchanger further includes a plurality of heat exchange plates arranged side by side, and the plurality of heat exchange tubes are sequentially arranged at intervals along the length direction of each heat exchange plate so as to be arranged in a single row on the heat exchange plate; along the first direction, the center distance between any two adjacent heat exchange tubes is D1, the maximum width of each heat exchange tube is D2, and the D1 and the D2 satisfy the following relation:

In one embodiment, the plurality of heat exchange tubes are all elliptical tubes;

and/or the heights of a plurality of heat exchange tubes on the heat exchange plates are the same.

In an embodiment, the heat exchange plate is provided with a plurality of mounting holes, the plurality of mounting holes are arranged in a single row and are sequentially arranged at intervals along the length direction of the heat exchange plate, and the plurality of heat exchange tubes correspondingly penetrate through the plurality of mounting holes of each heat exchange plate.

In one embodiment, the plurality of mounting holes are elliptical holes; and/or the number of the groups of groups,

The size and the height of the plurality of mounting holes on the heat exchange plate are the same.

In an embodiment, the upper end edge of the heat exchange plate is provided with a flow blocking strip, the middle part of the flow blocking strip is recessed downwards to be in an arc shape, and the flow blocking strip is positioned between any two adjacent mounting holes.

In an embodiment, a diversion hole is arranged between any two adjacent installation holes, a diversion edge which is annularly arranged is arranged at the outer periphery of the diversion hole, and the diversion edge is positioned under the flow blocking strip.

In an embodiment, the heat exchanger has a water inlet and a water outlet, the water inlet and the water outlet being on the same side of the heat exchanger;

And/or the heat exchange plates are stainless steel pieces;

And/or the heat exchange tube is an elliptical tube made of stainless steel, and the ratio of the long axis of the heat exchange tube to the short axis of the heat exchange tube is not less than 2 and not more than 3.

The utility model also provides a water heater, which comprises the heat exchanger.

The heat exchanger comprises the heat exchange tube and the heat exchange plate, wherein the heat exchange plate is used for carrying out heat exchange with the heat exchange tube, the heat exchange plate is sleeved outside the heat exchange tube, the minimum distance between any point on the heat exchange plate and the outer tube wall of the heat exchange tube is not more than 3mm, and the heat exchange plate is arranged in such a way that the distance between any point on the heat exchange plate and the heat exchange tube is relatively close, and the temperature on the heat exchange plate can be quickly transferred to the heat exchange tube, so that the heat exchange performance of the heat exchange plate is improved; and the material utilization rate of the heat exchange plate is improved, the temperature difference between the inner side of the heat exchange plate, which is close to the heat exchange tube, and the outer side of the heat exchange tube, which is far away from the heat exchange tube, is reduced, and the high-temperature area and the low-temperature area on the heat exchange plate are reduced, so that the temperature distribution on the heat exchange plate is more uniform. The high temperature area on the heat exchange plate is reduced, so that the heat storage capacity of the heat exchange plate is reduced, the temperature rise of water in the heat exchanger can be reduced when the water supply is stopped, the risk that a user is scalded by high-temperature water when the user starts the water heater again is reduced, that is, the temperature distribution on the heat exchange plate is more uniform, the high temperature area on the heat exchange plate is reduced, and the water supply stopping temperature rise of the heat exchanger is reduced.

In addition, when the water heater works with small load, the low temperature area on the heat exchange plate is reduced, the temperature of the heat exchange plate and the high-temperature flue gas after heat exchange is improved, so that the temperature of the whole heat exchange plate is higher, the situation that condensed water is generated due to the fact that the local low temperature on the heat exchange plate is reduced, and therefore the risk that the condensed water corrodes the water heater is reduced, that is, the temperature distribution on the heat exchange plate is more uniform, the low temperature area on the heat exchange plate is reduced, and the risk that the condensed water is generated by the heat exchanger to corrode the water heater is reduced. Therefore, the technical scheme in the scheme improves the heat exchange performance of the heat exchanger, reduces the risk of scalding users due to overhigh water cut-off temperature rise of water in the heat exchanger, and also reduces the risk of corroding the water heater due to condensed water generated by the heat exchanger.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a heat exchanger according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the structure of FIG. 1 after being disassembled;

FIG. 3 is a cross-sectional view of the structure of FIG. 1;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a schematic view of the structure of FIG. 1 after being partially exploded;

FIG. 6 is a cross-sectional view of the structure of FIG. 1;

FIG. 7 is a partial enlarged view at B in FIG. 6;

FIG. 8 is a cross-sectional view of the structure of FIG. 1;

FIG. 9 is an enlarged view of a portion of FIG. 8 at C;

FIG. 10 is a schematic view of the heat exchanger plate of FIG. 2;

FIG. 11 is a partial enlarged view of D in FIG. 10;

FIG. 12 is a schematic view of the spoiler of FIG. 2;

FIG. 13 is an enlarged view of a portion of FIG. 12 at E;

fig. 14 is a cross-sectional view of the structure of fig. 1.

Reference numerals illustrate:

Reference numerals	Name of the name	Reference numerals	Name of the name
				10	Heat exchanger	320	Through hole
11	Water inlet	330	Annular convex part
				12	Water outlet	340	First plate body
13	Water inlet pipe section	341	First flanging
				14	Water outlet pipe section	350	Second plate body
100	Heat exchange tube	360	Convex hull
				200	Heat exchange plate	370	Accommodating groove
210	Mounting hole	400	Turbulence piece
				220	Flow blocking strip	410	Turbulent flow main body
230	Deflector hole	411	Flow disturbing hole
				240	Diversion edge	412	Spoiler sheet
250	Second flanging	413	Turbulent flow protruding thorn
				300	End plate	420	Support part
310	Communication part	421	First supporting leg
				311	Communication port	422	Second supporting leg
312	First communicating part

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The water heater generally includes a heat exchanger, a burner, and a fan. The heat exchanger comprises a heat exchange tube and heat exchange plates sleeved on the periphery of the heat exchange tube, wherein the water inlet end of the heat exchange tube is connected with a cold water inlet pipe, and the water outlet end of the heat exchange tube is connected with a hot water outlet pipe. The burner is arranged below the heat exchanger. For the strong-drum type gas water heater, a fan is arranged below a burner; for the forced-pumping type gas water heater, a fan is arranged above the heat exchanger. When the water heater works, the fan is started, the mixed gas of fuel gas and air enters the combustor to burn, cold water in an external water supply system can enter the heat exchange tube of the heat exchanger through the cold water inlet tube, high-temperature flue gas generated by the combustor flows upwards to exchange heat with the heat exchanger, so that water in the heat exchange tube is heated, and heated hot water can be output to a user side through the hot water outlet tube to provide hot water for users.

The water-cut temperature rise/start-stop upper overshoot means that when the water heater works normally, the finned tube (namely the heat exchange tube with the heat exchange plate) is in a high temperature state, and after the water heater stops working, heat on the finned tube can be quickly transferred to water stopped flowing, so that the water temperature is increased. When the water heater is restarted, a section of high-temperature water flows out, and a user can be scalded when serious.

Based on the above, the utility model provides the heat exchanger and the water heater comprising the heat exchanger, the heat exchange performance of the heat exchanger is higher, and the risk that water in the heat exchanger is excessively high in water cut-off temperature rise and scalds a user can be reduced.

Referring to fig. 1 to 4, in an embodiment of a heat exchanger 10 according to the present utility model, the heat exchanger 10 includes a heat exchange tube 100 and a heat exchange plate 200, the heat exchange plate 200 is used for exchanging heat with the heat exchange tube 100, and the heat exchange plate 200 is sleeved outside the heat exchange tube 100; the minimum distance between any point on the heat exchange plate 200 and the outer tube wall of the heat exchange tube 100 is not more than 3mm on the axial projection surface of the heat exchange tube 100.

It can be understood that the number of the heat exchange tubes 100 may be plural, the number of the heat exchange plates 200 may be plural, the plurality of heat exchange plates 200 are arranged side by side, the plurality of heat exchange tubes 100 are sequentially arranged on each heat exchange plate 200, and the plurality of heat exchange tubes 100 are sequentially communicated to form a heat exchange flow channel. The heat exchange plate 200 is sleeved outside the heat exchange tube 100, and the heat exchange plate 200 may be clamped with the heat exchange tube 100 or welded and fixed, which is not limited herein. The heat exchange tube 100 and the heat exchange fins 200 may be made of copper, but may be made of other materials, which will be described in detail later.

Further, the axial projection surface of the heat exchange tube 100 can be understood as: along a radial cross-section of the heat exchange tube 100. The minimum distance between any point on the heat exchanger plate 200 and the outer tube wall of the heat exchanger tube 100 is not more than 3mm, which can be understood as: the distance between any point on the heat exchange plate 200 and the heat exchange tube 100 is not more than 3mm, that is, the minimum distance between any point on the heat exchange plate 200 and the heat exchange tube 100 is not more than 3mm along the radial direction of the heat exchange tube 100. That is, in a radial cross section of the heat exchange tube 100, a minimum distance between any point on the cross section of the heat exchange plate 200 and the outer tube wall of the heat exchange tube 100 is less than or equal to 3mm, so that the distance between any point on the heat exchange plate 200 and the heat exchange tube 100 is relatively close. When the water heater works, the heat exchange plates 200 absorbing the heat of the high-temperature flue gas can transfer the heat to the heat exchange tube 100, the distance between the heat exchange plates 200 and the heat exchange tube 100 is relatively short, the heat exchange capacity of the heat exchange plates 200 is improved, the volume of the heat exchange plates 200 is reduced, the material utilization rate of the heat exchange plates 200 is improved, and the temperature on the heat exchange plates 200 can be uniformly distributed. The minimum distance between the point on the heat exchanger plate 200 and the outer tube wall of the heat exchanger tube 100 may be 3mm, or 2.5mm, or 2mm, or 1mm, or 0mm, etc., and is not particularly limited herein.

The heat exchanger 10 comprises a heat exchange tube 100 and a heat exchange plate 200, wherein the heat exchange plate 200 is used for carrying out heat exchange with the heat exchange tube 100, the heat exchange plate 200 is sleeved outside the heat exchange tube 100, and the minimum distance between any point on the heat exchange plate 200 and the outer tube wall of the heat exchange tube 100 is not more than 3mm on the axial projection surface of the heat exchange tube 100; in addition, the material utilization rate of the heat exchange plate 200 is improved, the temperature difference between the inner side of the heat exchange plate 200, which is nearer to the heat exchange tube 100, and the outer side of the heat exchange tube 100 is reduced, and the high-temperature area and the low-temperature area on the heat exchange plate 200 are reduced, so that the temperature distribution on the heat exchange plate 200 is more uniform. The high temperature area on the heat exchange plate 200 is reduced, which is favorable for reducing the heat storage capacity of the heat exchange plate 200, so that the temperature rise of the water in the heat exchanger 10 during water cut-off can be reduced, and the risk of scalding a user by high-temperature water when the user starts the water heater again is reduced, that is, the temperature distribution on the heat exchange plate 200 is more uniform, the high temperature area on the heat exchange plate 200 is reduced, and the water cut-off temperature rise of the heat exchanger 10 is reduced.

In addition, when the water heater works under a small load, the low temperature area on the heat exchange plate 200 is reduced, so that the temperature of the heat exchange plate 200 and the high-temperature flue gas after heat exchange is improved, the whole heat exchange plate 200 is ensured to be higher, the condition that condensed water is generated due to the fact that the local low temperature on the heat exchange plate 200 is reduced, and therefore the risk that the condensed water corrodes the water heater is reduced, that is, the temperature distribution on the heat exchange plate 200 is more uniform by the aid of the scheme, the low temperature area on the heat exchange plate 200 is reduced, and the risk that the water heater is corroded due to the condensed water generated by the heat exchanger 10 is reduced. Therefore, the technical scheme in the scheme improves the heat exchange performance of the heat exchanger 10, reduces the risk of scalding users due to overhigh water cut-off temperature rise of water in the heat exchanger 10, and also reduces the risk of corroding the water heater due to condensed water generated by the heat exchanger 10.

In an embodiment, the heat exchanger 10 includes a plurality of heat exchange tubes 100 and a plurality of heat exchange plates 200 arranged side by side, and the plurality of heat exchange tubes 100 are sequentially arranged at intervals along the length direction of each heat exchange plate 200 so as to be arranged in a single row on the heat exchange plates 200. It can be understood that the heat exchanger 10 in this embodiment includes a plurality of heat exchange tubes 100, where the plurality of heat exchange tubes 100 are arranged in a single row on the heat exchange plate 200, that is, the plurality of heat exchange tubes 100 in this embodiment are single-layer tubes, and the single-layer fin tubes (that is, the single-layer heat exchange tubes 100 with the heat exchange plates 200) directly contact with high-temperature flue gas, so that compared with the double-layer fin tubes (that is, the heat exchange tubes 100 with upper and lower layers), the single-layer fin tubes have fewer low-temperature areas, and the single-layer fin tubes have no temperature difference between the upper and lower layers, so that condensate water is not easily generated in the single-layer fin tubes with fewer low-temperature areas when the burner of the water heater works under a small load, thereby reducing the risk of corroding the water heater with condensate water. In addition, the single-layer fin tube is matched with the heat exchange plate 200 with higher heat exchange performance, so that the heat exchange performance of the heat exchanger 10 is further improved. Compared with the double-layer finned tube, the water cut-off temperature rise of the single-layer finned tube is reduced by half.

In one embodiment, the plurality of heat exchange tubes 100 are elliptical tubes; and/or, the plurality of heat exchange tubes 100 are the same in height on the heat exchange plate 200.

It can be appreciated that the heat exchange tube 100 is an oval tube, and compared with the conventional round heat exchange tube 100, the oval heat exchange tube 100 is more beneficial to the flow of high-temperature flue gas to the back of the heat exchange tube 100 for heat exchange, and the heat exchange area of the oval tube per unit volume is larger than that of the round tube, so that the heat exchange efficiency of the heat exchanger 10 can be effectively improved.

In addition, the heights of the heat exchange tubes 100 on the heat exchange plates 200 are the same, so that the distances between the heat exchange tubes 100 and the burner are kept consistent, which is beneficial to ensuring that the temperatures of the heat exchange tubes 100 are basically the same when the heat exchange tubes 100 are contacted with high-temperature flue gas, avoiding the occurrence of the condition that condensed water is easy to generate due to larger temperature difference on the heat exchange tubes 100 arranged in a single row, and being beneficial to prolonging the service life of the heat exchanger 10.

Referring to fig. 3 and 10, in an embodiment, the heat exchanger plate 200 is provided with a plurality of mounting holes 210, the plurality of mounting holes 210 are arranged in a single row and are sequentially arranged at intervals along the length direction of the heat exchanger plate 200, and the plurality of heat exchanger tubes 100 are correspondingly arranged in the plurality of mounting holes 210 of each heat exchanger plate 200 in a penetrating manner. It can be understood that the plurality of mounting holes 210 on the heat exchange plate 200 are arranged in a single row and sequentially at intervals, so that the plurality of heat exchange tubes 100 are correspondingly arranged in the plurality of mounting holes 210 on the heat exchange plate 200 in a single row, the temperature difference between the plurality of heat exchange tubes 100 arranged in a single row after contacting with high-temperature flue gas is smaller, and compared with the case of arranging double-row heat exchange tubes 100, the high-temperature flue gas passes through the heat exchange tubes 100 at the lower layer first and then passes through the heat exchange tubes 100 at the upper layer, the heat exchange tubes 100 at the upper layer and the heat exchange tubes 100 at the lower layer have temperature differences, so that the double-row heat exchange tubes 100 are easy to generate condensed water, and the plurality of mounting holes 210 in the scheme are arranged in a single row, so that the plurality of heat exchange tubes 100 are arranged in a single row, the temperature keeping consistency of the plurality of heat exchange tubes 100 is ensured, the risk that the plurality of heat exchange tubes 100 generate condensed water to corrode the water heater is reduced, and the reliability of the heat exchanger 10 is improved.

Referring to fig. 10 and 11, in one embodiment, the mounting holes 210 are elliptical holes;

and/or, the plurality of mounting holes 210 are the same in size and height on the heat exchanger plate 200.

It can be appreciated that the plurality of mounting holes 210 are all elliptical holes, so that the corresponding heat exchange tube 100 penetrating through the plurality of mounting holes 210 is also an elliptical tube, the elliptical heat exchange tube 100 is more beneficial to heat exchange by flowing high-temperature flue gas to the back of the heat exchange tube 100, and the heat exchange area of the elliptical tube per unit volume is larger, which is beneficial to improving the heat exchange efficiency of the heat exchanger 10.

In addition, the size and the height of the plurality of mounting holes 210 on the heat exchange plate 200 are the same, so that the consistency of the plurality of mounting holes 210 is ensured, the size and the height of the plurality of heat exchange tubes 100 are kept consistent, the temperature of the plurality of heat exchange tubes 100 in contact with high-temperature flue gas is ensured to be basically the same, the condition that condensed water is easy to generate due to the fact that the plurality of heat exchange tubes 100 arranged in a single row have a larger temperature difference is avoided, and the service life of the heat exchanger 10 is prolonged.

In one embodiment, the mounting hole 210 has an outwardly extending second flange 250 on its outer periphery. The shape of the second flange 250 may be varied, such as, but not limited to, annular. By arranging the second flange 250, the sleeving area of the heat exchange tube 100 and the heat exchange plate 200 is increased, and the connection stability of the heat exchange tube 100 and the heat exchange plate 200 is improved. And, through setting up second turn-ups 250, still ensured to have certain interval between two adjacent heat exchanger plates 200, be favorable to high temperature flue gas to pass through between two adjacent heat exchanger plates 200 to improve the heat exchange efficiency of heat exchanger 10.

Referring to fig. 11, in an embodiment, a flow blocking strip 220 is disposed at an upper edge of the heat exchange plate 200, and a middle portion of the flow blocking strip 220 is recessed downward to be disposed in an arc shape, and the flow blocking strip 220 is located between any two adjacent mounting holes 210.

It can be understood that the flow blocking strips 220 are located between any two adjacent mounting holes 210, and the middle parts of the flow blocking strips 220 are recessed downwards, so that a flow guiding channel is formed between the flow blocking strips 220 and the heat exchange tubes 100 in the adjacent mounting holes 210, and the flow guiding channel can collect high-temperature flue gas to flow at the upper half part of the heat exchange tubes 100, namely, collect high-temperature flue gas to flow at the back surfaces of the heat exchange tubes 100; and can also block high temperature flue gas and flow up directly, delay the separation of high temperature flue gas and heat exchange tube 100, reduce the heat loss when increasing heat exchange intensity to be favorable to improving heat exchange efficiency. In this embodiment, the radian of the flow guiding strip is consistent with the radian of the heat exchange tube 100 in the adjacent mounting hole 210, so that the flow guiding and heat exchange of the high-temperature flue gas to the back surface of the heat exchange tube 100 are facilitated.

Referring to fig. 11, in an embodiment, a diversion hole 230 is disposed between any two adjacent installation holes 210, a diversion edge 240 disposed in a ring shape is disposed at an outer periphery of the diversion hole 230, and the diversion edge 240 is located under the baffle 220.

It can be understood that the heat at the position under the flow blocking strip 220 is concentrated, and the arrangement of the flow guide holes 230 under the flow blocking strip 220 avoids the local overheating at the position under the flow blocking strip 220, which is beneficial to improving the uniformity of the temperature distribution on the heat exchange plate 200; and, the outer periphery of the deflector hole 230 is provided with a deflector edge 240 which is annularly arranged, the deflector edge 240 deflects the collected high-temperature flue gas to the periphery of the heat exchange tube 100, and the arrangement of the deflector edge 240 is beneficial to increasing the heat exchange area and the heat exchange efficiency.

Referring to fig. 1, 2 and 5, in one embodiment, the heat exchanger 10 has a water inlet 11 and a water outlet 12, the water inlet 11 and the water outlet 12 being located on the same side of the heat exchanger 10;

and/or, the number of the heat exchange tubes 100 is 6, and the 6 heat exchange tubes 100 are sequentially arranged at intervals along the length direction of the heat exchange plate 200.

It will be appreciated that the heat exchanger 10 further comprises a water inlet pipe section 13 and a water outlet pipe section 14, the water inlet pipe section 13 being in communication with the water inlet 11 and the water outlet pipe section 14 being in communication with the water outlet 12. The water inlet 11 and the water outlet 12 are positioned on the same side of the heat exchanger 10, so that the same side space of the heat exchanger 10 is fully utilized, the compactness of water path arrangement of the water heater is improved, the space occupied by the water path arrangement device of the water heater is reduced, and the size of the water heater is reduced.

In addition, 6 heat exchange tubes 100 are arranged at intervals along the length direction of the heat exchange plate 200 in sequence, so that 6 heat exchange tubes 100 are arranged in a single row, and the temperature of the 6 heat exchange tubes 100 arranged in the single row can be ensured to be basically consistent with that of the high-temperature flue gas in contact, the risk that the heat exchange tubes 100 produce condensed water to corrode the water heater is reduced, and the reliability of the heat exchanger 10 is improved.

In an embodiment, the heat exchanger 10 further includes two end plates 300 disposed opposite to and at intervals, the plurality of heat exchange plates 200 are disposed between the two end plates 300, and the end plates 300 are stainless steel members;

and/or, the heat exchange plate 200 is a stainless steel member.

It can be understood that the end plate 300 is provided with a communicating portion 310, each two heat exchange tubes 100 are communicated by one communicating portion 310, and a plurality of heat exchange tubes 100 are communicated by a plurality of communicating portions 310 to form a heat exchange channel. The end plate 300 and/or the heat exchange plate 200 in the scheme are made of stainless steel materials, and the stainless steel has good heat conduction performance, high temperature resistance and corrosion resistance, so that the end plate 300 and/or the heat exchange plate 200 are not easy to corrode by condensed water, and the service life of the heat exchanger 10 is prolonged.

In an embodiment, the heat exchange tube 100 is an oval tube made of stainless steel, and the ratio of the long axis of the heat exchange tube 100 to the short axis of the heat exchange tube 100 is not less than 2 and not more than 3. It will be appreciated that the heat exchange tube 100 is an oval tube, that is, the cross section of the heat exchange tube 100 in the radial direction thereof is oval, that is, the outer circumferential profile of the heat exchange tube 100 is oval, and the oval has a major axis and a minor axis, and the ratio of the major axis to the minor axis is greater than or equal to 2 and less than or equal to 3. If the ratio of the long axis of the heat exchange tube 100 to the short axis of the heat exchange tube 100 is too large, the heat exchange tube 100 has too high local temperature due to the fact that the heat is easily accumulated at the fire-facing end of the heat exchange tube 100, so that water in the heat exchange tube 100 is easily generated due to high-temperature vaporization, and the service life of the heat exchange tube 100 is affected; if the ratio of the long axis of the heat exchange tube 100 to the short axis of the heat exchange tube 100 is too small, i.e. the heat exchange tube 100 is nearly circular, compared with the circular heat exchange tube 100, the oval heat exchange tube 100 is more beneficial to the flow of high-temperature flue gas to the back of the heat exchange tube 140 for heat exchange, and the heat exchange area of the unit volume of the oval heat exchange tube 100 is larger than that of the circular tube, so that the heat exchange efficiency of the heat exchanger 100 can be effectively improved.

Therefore, the heat exchange tube 100 is an elliptical tube made of stainless steel, and the ratio range of the long axis of the heat exchange tube 100 to the short axis of the heat exchange tube 100 is limited, so that the heat exchange tube 100 has good heat conduction performance, high temperature resistance and corrosion resistance, the contact area between the heat exchange tube 100 and high temperature smoke is large, the heat exchange area is enlarged, and the heat exchange efficiency and the material utilization rate can be improved. The ratio of the long axis of the heat exchange tube 100 to the short axis of the heat exchange tube 100 may be 2.0, or 2.2, or 2.5, or 2.8, or 3.0, which is not limited herein.

In addition, the heat exchange plate 200 and the heat exchange tube 100 in the heat exchanger 10 are made of stainless steel, and the minimum distance between any point on the heat exchange plate 200 and the outer tube wall of the heat exchange tube 100 is not more than 3mm, that is, the distance between the heat exchange plate 200 and the heat exchange tube 100 is relatively close, so that the temperature on the heat exchange plate 200 can be quickly transferred to the heat exchange tube 100, and the heat exchange efficiency of the heat exchanger 10 is further improved.

It will be appreciated that with a given size of heat exchanger 10, a larger tube spacing between adjacent heat exchange tubes 100 results in a reduced number of heat exchange tubes 100 being installed, thereby affecting the heat exchange efficiency of the heat exchanger 10 as well as affecting the performance of the water heater.

In order to improve the heat exchange efficiency of the heat exchanger 10, referring to fig. 1, 2, 8 and 9, in an embodiment, the heat exchanger 10 further includes two end plates 300 disposed at intervals and a plurality of heat exchange tubes 100 disposed between the two end plates 300 and arranged at intervals along the first direction, each end plate 300 has a plurality of communication portions 310 and a plurality of through holes 320, an annular protrusion 330 extending toward the other end plate 300 is disposed at an outer periphery of each through hole 320 of the end plate 300, an end portion of each heat exchange tube 100 is inserted into one of the annular protrusions 330 and is in sealing connection with the annular protrusion 330, the communication portion 310 has a communication port 311 communicating with the through hole 320, each two heat exchange tubes 100 are communicated through the communication port 311 of one communication portion 310, and the plurality of heat exchange tubes 100 are communicated through the plurality of communication portions 310 to form a heat exchange channel.

It will be appreciated that the two end plates 300 are disposed opposite to and spaced apart from each other in a second direction, and the plurality of heat exchange tubes 100 are disposed between the two end plates 300, the second direction intersecting the first direction. In this embodiment, the first direction may specifically be the width direction (e.g. the front-rear direction) of the heat exchanger 10, the second direction may specifically be the length direction (e.g. the left-right direction) of the heat exchanger 10, the two end plates 300 cooperate together to support the plurality of heat exchange tubes 100, the communicating portions 310 on the two end plates 300 also function as water boxes, so that the plurality of independent heat exchange tubes 100 are connected in series to form a tortuous heat exchange channel, and thus, the arrangement is such that there is no need to provide a bent pipe structure on the outer sides of the two end plates 300 to connect the two adjacent heat exchange tubes 100, so that the assembly process can be simplified and the production efficiency can be improved.

Further, the end plate 300 is provided with a plurality of through holes 320, the outer periphery of the through holes 320 is provided with an annular protrusion 330, the annular protrusion 330 is arranged on one side of the end plate 300 facing the other end plate 300, namely, the annular protrusion 330 is arranged on one side of the end plate 300 facing the heat exchange tube 100, so that the end part of the heat exchange tube 100 is conveniently inserted into the annular protrusion 330, and the heat exchange tube 100 and the annular protrusion 330 are conveniently and hermetically connected, so that the heat exchange tube 100 can occupy no inner space of the communicating part 310, thereby being beneficial to reducing the volume of the communicating part 310, namely, being beneficial to reducing the width dimension of the communicating opening 311 of the communicating part 310 along the first direction, correspondingly, being beneficial to reducing the tube spacing between the two heat exchange tubes 100 communicated with the communicating part 310, and being beneficial to increasing the arrangement quantity of the heat exchange tube 100 in a certain range of the width dimension of the heat exchanger, and further being beneficial to improving the heat exchange efficiency of the heat exchanger. Among the ways in which the heat exchange tube 100 is sealingly connected to the annular boss 330 include, but are not limited to: the heat exchange tube 100 is welded to the annular protrusion 330 sleeved outside the end portion of the heat exchange tube, so that the assembly process can be simplified, and the stability of the sealing can be ensured.

Referring to fig. 6 to 9, in an embodiment, the communicating portion 310 that communicates two heat exchange tubes 100 is defined as a first communicating portion 312, a maximum opening width of the communicating opening 311 of the first communicating portion 312 along the first direction is W1, and a maximum width of two annular protruding portions 330 that communicate with the first communicating portion 312 and outside two heat exchange tubes 100 along the first direction is W2, W1 is less than or equal to W2.

It may be appreciated that, in this embodiment, the annular protrusion 330 is disposed on a side of the end plate 300 facing the heat exchange tube 100, a connection portion adapted to the communication portion 310 is not required to be disposed on a side of the end plate 300 facing away from the heat exchange tube 100, that is, a side of the end plate 300 facing away from the heat exchange tube 100 is not required to be disposed on an annular protrusion adapted to the communication portion 310, each two heat exchange tubes 100 are communicated through the communication port 311 of one communication portion 310, W1 is less than or equal to W2, that is, the annular protrusion 330 in this embodiment does not occupy an inner space of the communication port 311 of the first communication portion 312, thereby being beneficial to reducing a width dimension of the communication port 311 of the first communication portion 312 along the first direction, so that the width dimension of the first communication portion 312 along the first direction can be reduced, that is, i.e., the width dimension of the first communication portion 312 can be reduced. The reduced width dimension of the first communication portion 312 is beneficial to reducing the tube spacing between the two heat exchange tubes 100 communicated with the first communication portion 312, so that the heat exchanger 10 can increase the number of the heat exchange tubes 100 within a certain width dimension range, and further improve the heat exchange efficiency of the plurality of heat exchange tubes 100, that is, the heat exchange efficiency of the heat exchanger 10.

From the foregoing, W1 is less than or equal to W2, that is, the annular protruding portion 330 is connected with the end portion of the heat exchange tube 100, the annular protruding portion 330 does not occupy the inner space of the communication port 311 of the first communication portion 312, so that the opening width of the communication port 311 of the first communication portion 312 along the first direction can be reduced, that is, the width dimension of the first communication portion 312 along the first direction can be reduced, so that the tube spacing between two heat exchange tubes 100 communicated with the first communication portion 312 can be reduced, the tube spacing between two heat exchange tubes 100 is reduced, under the condition that the dimension of the heat exchanger 10 is fixed, the heat exchange tube 100 is more arranged in the first direction, the number of the heat exchange tubes 100 is increased, and the heat exchange efficiency of the heat exchanger 10 can be improved. It can be seen that the technical solution of the present application is advantageous for reducing the tube spacing between the two heat exchange tubes 100, thereby being advantageous for improving the heat exchange efficiency of the heat exchanger 10.

Referring to fig. 3, 4 and 14, in an embodiment, the heat exchanger 10 further includes a plurality of heat exchange plates 200 arranged side by side, and the plurality of heat exchange tubes 100 are sequentially arranged at intervals along the length direction of each heat exchange plate 200 so as to be arranged in a single row on the heat exchange plates 200; along the first direction, the center distance between any two adjacent heat exchange tubes 100 is D1, the maximum width of the heat exchange tube 100 is D2, and the following relation between D1 and D2 is satisfied:

It can be understood that the heat exchange tubes 100 are arranged in a single row on the heat exchange plate 200, that is, the heat exchange tubes 100 in the scheme are single-layer tubes, the single-layer fin tubes (that is, the single-layer heat exchange tubes 100 with the heat exchange plates 200) are directly contacted with high-temperature flue gas, compared with the double-layer fin tubes (that is, the heat exchange tubes 100 with upper and lower layers), the single-layer fin tubes have fewer low-temperature areas, the single-layer fin tubes have no problem of temperature difference between the upper and lower layers, and when the burner of the water heater works under a small load, the single-layer fin tubes with fewer low-temperature areas are not easy to generate condensed water, so that the risk of the condensed water corroding the water heater is reduced. In addition, the single-layer fin tube is matched with the heat exchange plate 200 with higher heat exchange performance, so that the heat exchange performance of the heat exchanger 10 is further improved.

In addition, half of the difference between D1 and D2 is less than or equal to 3mm, so that the distance between the heat exchanger plate 200 and the heat exchanger tube 100 is relatively short, which is advantageous for improving the heat exchange capacity of the heat exchanger plate 200, and is also advantageous for reducing the volume of the heat exchanger plate 200, and improving the material utilization rate of the heat exchanger plate 200, so that the temperature on the heat exchanger plate 200 can be uniformly distributed. The difference between D1 and D2 may be half of 3mm, or 2.5mm, or 2mm, or 1mm, or the like, and is not particularly limited herein.

Referring to fig. 1, 2 and 5, in an embodiment, the end plate 300 includes a first plate 340 and a second plate 350, the first plate 340 is provided with the through hole 320, the second plate 350 is provided with the communication portion 310, and the second plate 350 is disposed on a side of the first plate 340 facing away from the heat exchange tube 100 and is in sealing connection with the first plate 340.

It is to be understood that the communication portion 310 on the second plate 350 may be formed by stamping into a groove shape, and a side of the second plate 350 facing away from the communication port 311 may be a plane, or may be a protrusion, which is not limited herein, and will be described in detail later. The communication port 311 of the communication part 310 communicates with the through hole 320 of the first plate 340, and the heat exchange tube 100 communicates with the through hole 320 of the first plate 340, thereby allowing the heat exchange tube 100 to communicate with the communication part 310. The second plate 350 is disposed on a side of the first plate 340 opposite to the heat exchange tube 100, so that the second plate 350 is in sealing connection with the first plate 340, and the second plate 350 and the heat exchange tube 100 do not interfere with each other, and the sealing connection manner includes but is not limited to: the second plate 350 is integrally welded and sealed with the first plate 340, or is integrally filled and sealed by a sealing member, which is beneficial to simplifying the assembly process, and is beneficial to improving the assembly efficiency by sealing connection of the whole second plate 350 without configuring an elbow structure for every two heat exchange tubes 100.

In an embodiment, the second plate 350 has a first plate surface facing the first plate 340 and a second plate surface facing away from the first plate 340, and the first plate surface is recessed in a direction facing the second plate surface to form the communication portion 310. The arrangement is that the communication portion 310 is formed by recessing the second plate 350 in a groove shape toward the direction of the second plate surface, and the groove shape may be formed by stamping, that is, the second body may form the communication portion 310 by stamping, so that the communication portion 310 is easy to be formed, and the manufacturing process of the end plate 300 is facilitated to be simplified.

In an embodiment, the second plate surface bulges away from the first plate surface, so that the communication portion 310 forms a convex hull 360 on the second plate surface. It can be appreciated that when the thickness of the second plate 350 is thicker, the difficulty of forming the groove-shaped communication portion 310 by punching is greater, in this embodiment, the thickness of the second plate 350 is thinner, so that when the second plate 350 is punched, the convex hull 360 is formed on the second plate surface opposite to the first plate 340, and the convex hull 360 structure not only makes the communication portion 310 easy to punch and form, but also is beneficial to reducing the material consumption of the second plate 350, thereby reducing the manufacturing cost.

In an embodiment, the convex hull 360 and the second plate 350 are integrally formed, and the communicating portion 310 and the convex hull 360 are formed by stamping. It can be appreciated that, for the convex hull 360 and the second plate 350 are fixed by welding, the convex hull 360 and the communicating portion 310 in the present solution are formed by stamping the second plate 350, which is not only beneficial to enhancing the strength of the second plate 350, but also simplifies the manufacturing process of the communicating portion 310, avoids the problem of weak sealing when the convex hull 360 and the second plate 350 are connected in a sealing manner (such as welding sealing), and improves the reliability of the second body.

In an embodiment, one of the communicating portions 310 is provided with a water inlet 11, the other communicating portion 310 is provided with a water outlet 12, the heat exchanger 10 further includes a water inlet pipe section 13 and a water outlet pipe section 14, the water inlet pipe section 13 is communicated with the water inlet 11, the water outlet pipe section 14 is communicated with the water outlet 12, and the water inlet 11 and the water outlet 12 are located on the same side of the heat exchanger 10. The arrangement is beneficial to fully utilizing the same side space of the heat exchanger 10, improving the compactness of water path arrangement of the water heater and reducing the space occupied by the water path arrangement device of the water heater, thereby being beneficial to reducing the volume of the water heater.

Referring to fig. 1, 2 and 5, in an embodiment, a first flange 341 extending away from the other end plate 300 and disposed in an annular shape is disposed at a periphery of the first plate 340, a receiving groove 370 is formed by enclosing the first flange 341 and the first plate 340, the second plate 350 is disposed in the receiving groove 370, and the periphery of the second plate 350 is connected with the first plate 340 and/or the first flange 341 in a sealing manner.

It can be appreciated that the side of the first plate 340 facing the second plate 350 is formed with a receiving groove 370, and the second plate 350 is disposed in the receiving groove 370, so as to facilitate quick positioning and mounting of the second plate 350. The periphery of the second plate 350 may be welded to the first plate 340, or the periphery of the second plate 350 may be welded to the first flange 341, or the joint between the periphery of the second plate 350 and the first plate 340 and the first flange 341 may be welded to the second plate 350, which is not limited herein. Through with the periphery and the first plate body 340 and/or first turn-ups 341 sealing connection of second plate body 350, be formed with a plurality of intercommunication portions 310 on the second plate body 350, the intercommunication portion 310 need not with heat exchange tube 100 welding, for every two heat exchange tube 100 need weld a return bend structure, this scheme can simplify the assembly process of heat exchanger 10, improves production efficiency.

When the water heater works, cold water enters the heat exchange tube 100, high-temperature flue gas flows upwards, the bottommost end of the heat exchange tube 100 is contacted with the high-temperature flue gas first, the bottommost end of the heat exchange tube 100 is a fire-facing end, and the fire-facing end of the heat exchange tube 100 is easy to generate local high-temperature vaporization to generate noise, so that the mute performance index of the water heater is affected.

In order to reduce the vaporization noise of the heat exchange tube 100, referring to fig. 2, 4, 12 and 13, in an embodiment, a spoiler 400 for spoiler the water flow is disposed in at least one of the heat exchange tubes 100, the spoiler 400 includes a spoiler main body 410 and two supporting portions 420, the top ends of the two supporting portions 420 are connected to the spoiler main body 410, and the bottom ends of the two supporting portions 420 are disposed at intervals and respectively supported on the inner wall of the heat exchange tube 100.

It should be understood that one spoiler 400 may be disposed in each heat exchange tube 100, and of course, the spoiler 400 may be disposed only in one or a part of the heat exchange tubes 100 as needed, which is not limited herein. In this embodiment, a turbulence member 400 may be disposed in each heat exchange tube 100, where the turbulence member 400 can prolong the flow path of water flow in the heat exchange tube 100, enhance the turbulence effect, and increase the contact time between the high-temperature flue gas and water, so that the heat exchange between the high-temperature flue gas and water is more sufficient.

Further, the spoiler 400 includes a spoiler body 410 and two supporting portions 420, the spoiler body 410 is connected to the top ends of the two supporting portions 420, so that the spoiler 400 is approximately in a "man" shape, the bottom ends of the two supporting portions 420 are spaced and respectively supported on the inner wall surface of the fire-facing end of the heat exchange tube 100, the two supporting portions 420 increase the contact area with the inner wall surface of the fire-facing end of the heat exchange tube 100, destroy the flow boundary layer of the inner wall surface of the fire-facing end of the heat exchange tube 100, thereby increasing the contact time between high-temperature flue gas and water, being beneficial to increasing the temperature of water flow in the heat exchange tube 100, i.e. strengthening the heat transfer inside the fire-facing end of the heat exchange tube 100, and reducing the noise generated by local overheating vaporization of the fire-facing end of the heat exchange tube 100. Therefore, the turbulence piece 400 is arranged, so that the turbulence effect on water is increased, the flowing boundary layer of the inner wall surface of the fire-facing end of the heat exchange tube 100 is damaged, the heat exchange between water flow and high-temperature flue gas is more sufficient, and the vaporization noise of the heat exchange tube 100 can be reduced.

Further, one of the supporting portions 420 of the two supporting portions 420 includes a plurality of first supporting legs 421, the other supporting portion 420 includes a plurality of second supporting legs 422, the plurality of first supporting legs 421 and the plurality of second supporting legs 422 are alternately arranged along the length direction of the spoiler 400 in sequence, the plurality of first supporting legs 421 are obliquely arranged toward one side of the spoiler body 410, and the plurality of second supporting legs 422 are obliquely arranged toward the other side of the spoiler body 410. So set up for a plurality of first supporting legs 421 and a plurality of second supporting legs 422 can be stable support on the inner wall of heat exchange tube 100, and can also strengthen the vortex effect.

In an embodiment, on the axial projection surface of the heat exchange tube 100, the first supporting leg 421 and the second supporting leg 422 form an included angle, and the included angle is an acute angle. The arrangement is such that the distance between the bottom end of the first supporting leg 421 and the bottom end of the second supporting leg 422 is relatively close to the bottommost distance between the two ends of the heat exchange tube 100, so that the inner wall surface of the fire end of the heat exchange tube 100 is damaged, the heat transfer inside the fire end of the heat exchange tube 100 can be enhanced, and the effect of reducing the noise generated by local overheating vaporization of the fire end of the heat exchange tube 100 is achieved.

Of course, in other embodiments, on the axial projection surface of the heat exchange tube 100, the first supporting leg 421 and the second supporting leg 422 form an included angle, and the included angle is a right angle or an obtuse angle, which is not limited herein.

Referring to fig. 12 and 13, in an embodiment, the turbulence body 410 is provided with a plurality of turbulence holes 411, the plurality of turbulence holes 411 are arranged at intervals along the length direction of the heat exchange tube 100, and the turbulence member 400 has a water facing end; the edge of each turbulence hole 411 away from the water facing end is provided with an outwardly inclined turbulence plate 412, and two adjacent turbulence plates 412 are located at two sides of the turbulence main body 410;

And/or, a turbulence convex thorn 413 extending towards the water facing end is arranged on the wall of at least one turbulence hole 411.

It can be appreciated that the turbulence plates 412 inclined outwards are disposed in each turbulence hole 411, and each turbulence plate 412 is disposed at the edge of the turbulence hole 411 away from the water-facing end, so that the turbulence effect can be enhanced, and scaling of water in the heat exchange tube 100 can be avoided. The adjacent spoiler 412 is located at two sides of the spoiler body 410, so that the spoiler effect can be further enhanced.

In addition, be equipped with the protruding thorn 413 of vortex in the vortex hole 411, the protruding thorn 413 of vortex extends towards the windward end of vortex 400 and sets up, and when rivers passed through the vortex hole 411, the protruding thorn 413 of vortex caused the blocking to the rivers to the extension rivers flow path in heat exchange tube 100 has further strengthened the vortex effect, thereby can further reduce the vaporization noise of heat exchange tube 100.

In an embodiment, the top wall and/or the bottom wall of the turbulence hole 411 are provided with turbulence protrusions 413, so that when water passes through the turbulence hole 411, the turbulence protrusions 413 arranged on the top wall of the turbulence hole 411 and/or the turbulence protrusions 413 arranged on the bottom wall of the turbulence hole 411 increase the turbulence effect of the turbulence piece 400, so that the heat exchange between the water flow and the high-temperature flue gas is more sufficient, and the vaporization noise of the heat exchange tube 100 is further reduced.

In one embodiment, the annular protrusion 330 is disposed in an elliptical ring shape, and the end of the heat exchange tube 100 passes through the annular protrusion 330 and protrudes into the through hole 320;

and/or, the through holes 320 are arranged in an elliptical shape.

It can be appreciated that the annular protrusion 330 is in an elliptical ring shape, so as to be convenient for matching with the elliptical heat exchange tube 100, when the end of the elliptical heat exchange tube 100 is inserted into the annular protrusion 330, the outer wall of the heat exchange tube 100 can be tightly attached to the inner wall surface of the annular protrusion 330, so that the heat exchange tube 100 is convenient to be in sealing connection with the annular protrusion 330. In addition, the end portion of the heat exchange tube 100 passes through the annular protrusion 330 and extends into the through hole 320, which increases the contact area between the heat exchange tube 100 and the end plate 300, and is beneficial to improving the connection stability between the heat exchange tube 100 and the end plate 300.

In addition, the through holes 320 are arranged in an oval shape so as to be convenient to be matched with the oval heat exchange tubes 100, namely, the ends of the oval heat exchange tubes 100 extend into the through holes 320 to be tightly attached to the end plate 300, so that the plurality of through holes 320 are compactly distributed on the end plate 300, and the tube spacing between the two heat exchange tubes 100 is further reduced.

The utility model also provides a water heater, which comprises the heat exchanger 10, and the specific structure of the heat exchanger 10 refers to the above embodiments, and because the water heater adopts all the technical schemes of all the embodiments, the water heater at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein. The water heater comprises, but is not limited to, a strong drum type water heater with a lower fan or a strong pumping type water heater with an upper fan.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (11)

1. A heat exchanger, comprising:

A heat exchange tube; and

The heat exchange plate is used for exchanging heat with the heat exchange tube and sleeved outside the heat exchange tube; and on the axial projection surface of the heat exchange tube, the minimum distance between any point on the heat exchange plate and the outer tube wall of the heat exchange tube is not more than 3mm.

2. The heat exchanger as claimed in claim 1, further comprising two end plates disposed at an interval and a plurality of heat exchange tubes disposed between the two end plates and arranged at intervals in a first direction, each of the end plates having a plurality of communication portions and a plurality of through holes, an annular protrusion extending toward the other end plate being provided at an outer periphery of each of the through holes of the end plates, an end portion of each of the heat exchange tubes being inserted into one of the annular protrusions and being in sealing connection with the annular protrusion, the communication portions having a communication port communicating with the through holes, each of the two heat exchange tubes being communicated through a communication port of one of the communication portions, the plurality of heat exchange tubes being communicated through a plurality of the communication portions to form a heat exchange passage.

3. The heat exchanger according to claim 2, wherein the communicating portion that communicates two of the heat exchange tubes is defined as a first communicating portion, a maximum opening width of a communicating port of the first communicating portion in the first direction is W1, and a maximum width of two annular protrusions outside the two heat exchange tubes that communicate with the first communicating portion in the first direction is W2, W1 is equal to or less than W2.

4. A heat exchanger as claimed in claim 3, further comprising a plurality of said heat exchange plates arranged side by side, a plurality of said heat exchange tubes being arranged in a sequence spaced along the length of each of said heat exchange plates so as to be arranged in a single row on said heat exchange plates; along the first direction, the center distance between any two adjacent heat exchange tubes is D1, the maximum width of each heat exchange tube is D2, and the D1 and the D2 satisfy the following relation:

5. the heat exchanger of claim 2, wherein a plurality of said heat exchange tubes are oval tubes;

and/or the heights of a plurality of heat exchange tubes on the heat exchange plates are the same.

6. The heat exchanger of claim 2, wherein the heat exchanger plates are provided with a plurality of mounting holes, the plurality of mounting holes are arranged in a single row and are sequentially arranged at intervals along the length direction of the heat exchanger plates, and a plurality of heat exchange tubes correspondingly penetrate through the plurality of mounting holes of each heat exchanger plate.

7. The heat exchanger of claim 6, wherein each of the plurality of mounting holes is an elliptical hole;

and/or the size and the height of the plurality of mounting holes on the heat exchange plate are the same.

8. The heat exchanger of claim 7, wherein the upper edge of the heat exchanger plate is provided with a flow blocking strip, the middle of the flow blocking strip is recessed downwards to be arranged in an arc shape, and the flow blocking strip is positioned between any two adjacent mounting holes.

9. The heat exchanger of claim 8, wherein a deflector hole is provided between any adjacent two of the mounting holes, and a deflector edge arranged in an annular shape is provided at an outer periphery of the deflector hole, and the deflector edge is located right under the deflector strip.

10. The heat exchanger according to any one of claims 1 to 9, wherein the heat exchanger has a water inlet and a water outlet, the water inlet and the water outlet being located on the same side of the heat exchanger;

And/or the heat exchange plates are stainless steel pieces;

And/or the heat exchange tube is an elliptical tube made of stainless steel, and the ratio of the long axis of the heat exchange tube to the short axis of the heat exchange tube is not less than 2 and not more than 3.

11. A water heater comprising a heat exchanger as claimed in any one of claims 1 to 10.