Heat exchanger and gas water heater

Abstract

The utility model relates to the technical field of gas water heaters, in particular to a heat exchanger and a gas water heater. The heat exchanger comprises a heat exchange pipe, a connecting pipe and a temperature control assembly, the end of the connecting pipe is communicated with the end of the heat exchange pipe in an inserted mode and provided with a positioning step, and a clamping ring groove is formed between the end of the heat exchange pipe and the corresponding positioning step. The temperature control assembly comprises a support and a temperature controller installed on the support, the support is provided with a positioning hole and arranged in the clamping ring groove in a sleeved mode through the positioning hole, the end of the connecting pipe penetrates through the positioning hole, and the support is attached to the inner wall of the clamping ring groove. The gas water heater comprises the heat exchanger, the support is positioned and clamped through the clamping ring grooves, pre-positioning of the support during installation is achieved, and the installation precision of the support is improved. The inner wall of the positioning hole is attached to the inner wall of the clamping ring groove, the contact area between the heat exchange tube and the support and the contact area between the connecting tube and the support are increased, the heat transfer efficiency between the heat exchange tube and the support and between the connecting tube and the support is improved, and the measurement accuracy of the temperature controller is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas water heaters, in particular to a heat exchanger and a gas water heater. Background Art

[0002] In a gas water heater, multiple heat exchange tubes in the heat exchanger are connected through a U-shaped connecting pipe. The high-temperature flue gas generated by burning gas passes through the heat exchanger, causing the water in the heat exchange tube to exchange heat with the high-temperature flue gas to achieve the purpose of heating the water. The heat exchanger is equipped with a temperature control component as a protection device. When the water temperature in the heat exchange tube is too high (exceeding the protection value), the thermostat in the temperature control component is disconnected, controlling the burner to stop heating, avoiding problems such as dry burning and water scalding.

[0003] In existing temperature control components, the bracket for installing the thermostat is mostly a flat plate, which is tightly attached to and welded on the U-shaped connecting pipe. The water temperature after heat exchange is transmitted to the thermostat through the U-shaped connecting pipe and the flat plate. Since the bracket is a flat plate structure, it is impossible to position the bracket when welding with the U-shaped connecting pipe, resulting in the inability to accurately control the welding position and welding angle. In addition, the contact area between the bracket and the U-shaped connecting pipe is small, the heat transfer efficiency is low, and the accuracy of the thermostat measurement is reduced. Utility Model Content

[0004] One of the technical problems solved by the utility model is to provide a heat exchanger which can effectively solve the problems in the prior art that the bracket of the temperature control component cannot be positioned during installation and the measurement accuracy of the temperature controller is low.

[0005] The second technical problem solved by the utility model is to provide a gas water heater, which can effectively solve the problems in the prior art that the bracket of the temperature control component cannot be positioned during installation and the accuracy of the temperature controller measurement is low.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] A heat exchanger, comprising a heat exchange tube, a connecting tube and a temperature control assembly, wherein the end of the connecting tube is plugged and connected to the end of the heat exchange tube and is provided with a positioning step, and a clamping ring groove is formed between the end of the heat exchange tube and the corresponding positioning step;

[0008] The temperature control assembly includes a bracket and a temperature controller installed on the bracket. The bracket is provided with a positioning hole and is sleeved in the clamping ring groove through the positioning hole. The end of the connecting pipe passes through the positioning hole and the bracket fits against the inner wall of the clamping ring groove.

[0009] Compared with the background technology, the heat exchanger described in the utility model has the following beneficial effects:

[0010] In the heat exchanger, a clamping ring groove is formed between the end of the heat exchange tube and the positioning step of the end of the connecting tube. The bracket is sleeved in the clamping ring groove through the positioning hole, so that the clamping ring groove forms a positioning clamp for the bracket, realizing the pre-positioning of the bracket during installation and improving the installation accuracy of the bracket. At the same time, the bracket is connected to the inner wall of the clamping ring groove in a fitting manner, increasing the contact area between the heat exchange tube and the connecting tube and the bracket, thereby improving the heat transfer efficiency between the heat exchange tube and the connecting tube and the bracket, and improving the accuracy of the temperature controller measurement.

[0011] In one embodiment, the bracket includes a positioning plate and a mounting plate connected at an acute angle, the positioning plate is provided with the positioning hole, the thermostat is mounted on the mounting plate, and the side of the mounting plate facing away from the thermostat abuts against the connecting pipe.

[0012] In one embodiment, the acute angle between the positioning plate and the mounting plate is 45° to 90°.

[0013] In one of the embodiments, one side of the positioning plate along the thickness direction is fitted with the axial end face of the end of the heat exchange tube, and the other side of the positioning plate along the thickness direction is fitted with the side face of the positioning step; the inner wall of the positioning hole is fitted with the inner bottom wall of the clamping ring groove.

[0014] In one of the embodiments, a guide opening is provided on the positioning plate, the guide opening passes through a side wall of the positioning plate and is connected to the positioning hole, and the end of the connecting pipe slides into or out of the positioning hole through the guide opening in a radial direction.

[0015] In one embodiment, the minimum width of the guide opening is smaller than the diameter of the positioning hole.

[0016] In one of the embodiments, a rounded corner structure is provided at a connection point between the guide opening and the positioning hole and at a connection point between the guide opening and the outer side wall of the positioning plate.

[0017] In one of the embodiments, one end of the thermostat is plugged into the mounting plate, and the other end of the thermostat is fastened to the mounting plate via a fastener.

[0018] In one of the embodiments, the mounting plate is provided with a socket, and one end of the thermostat is plugged into the socket.

[0019] The above second technical problem is solved by the following technical solution:

[0020] A gas water heater comprises the above-mentioned heat exchanger.

[0021] Compared with the background technology, the gas water heater of the utility model has the following beneficial effects:

[0022] In a gas water heater, a clamping ring groove is formed between the end of the heat exchange tube of the heat exchanger and the positioning step at the end of the connecting tube. The bracket is sleeved in the clamping ring groove through the positioning hole, so that the clamping ring groove forms a positioning clamp for the bracket, realizing the pre-positioning of the bracket during installation and improving the installation accuracy of the bracket. At the same time, the bracket is connected to the inner wall of the clamping ring groove, which increases the contact area between the heat exchange tube and the connecting tube and the bracket, thereby improving the heat transfer efficiency between the heat exchange tube and the connecting tube and the bracket, and improving the accuracy of the thermostat measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a heat exchanger provided in an embodiment of the utility model;

[0024] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0025] Figure 3 It is a partial structural schematic diagram of a heat exchanger provided in an embodiment of the utility model;

[0026] Figure 4 It is a structural schematic diagram of a temperature control assembly provided by an embodiment of the utility model;

[0027] Figure 5 It is a schematic diagram of the structure of the bracket provided by the embodiment of the utility model;

[0028] Figure 6 It is an end view of the bracket provided in the embodiment of the utility model.

[0029] The names and numbers of the components in the figure are as follows:

[0030] 100. heat exchanger; 1. heat exchange tube; 10. clamping ring groove; 2. connecting pipe; 21. positioning step; 3. bracket; 31. positioning plate; 311. positioning hole; 312. guide opening; 3121. guide slope; 32. mounting plate; 321. mounting hole; 322. socket; 4. thermostat. DETAILED DESCRIPTION

[0031] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly stipulated and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them.

[0034] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0035] This embodiment proposes a gas water heater, which includes a burner, a combustion chamber, a heat exchanger and other components. The burner burns gas in the combustion chamber to heat the water flowing through the heat exchanger. A temperature control component is installed in the heat exchanger. When the water temperature in the heat exchange tube in the heat exchanger is too high, the thermostat in the temperature control component is disconnected to control the burner to stop heating, thereby avoiding problems such as dry burning and scalding due to water discharge.

[0036] like Figure 1 and Figure 2 As shown, this embodiment also proposes a heat exchanger 100 for use in the above-mentioned gas water heater. The heat exchanger 100 includes a heat exchange tube 1 and a connecting tube 2. The multiple heat exchange tubes 1 are connected through the connecting tube 2, so that water can flow through the heat exchange tube 1 and perform heat exchange and temperature rise. Specifically, the ends of two adjacent heat exchange tubes 1 on the same side are connected through the same U-shaped connecting tube 2. Both ends (the two ends in the axial direction) of the connecting tube 2 have positioning steps 21 (that is, a retaining ring circumferentially arranged around the end of the connecting tube 2). When the end of the connecting tube 2 is plugged and connected to the end of the heat exchange tube 1, the positioning step 21 is used to limit the length of the connecting tube 2 inserted into the heat exchange tube 1.

[0037] In existing temperature control assemblies, the bracket for installing the thermostat is mostly a flat plate, which is tightly attached to and welded on the connecting pipe. The water temperature after heat exchange is transmitted to the thermostat through the connecting pipe and the flat plate. Since the bracket is a flat plate structure, it is impossible to position the bracket when welding with the connecting pipe, resulting in the inability to accurately control the welding position and welding angle. The contact area between the bracket and the connecting pipe is small, the heat transfer efficiency is low, and the accuracy of the thermostat measurement is reduced.

[0038] To solve the above problems, Figure 2 to Figure 4As shown, the heat exchanger 100 of this embodiment also includes a temperature control assembly, the end of the connecting pipe 2 is plugged and connected to the end of the heat exchange tube 1 and is provided with a positioning step 21, and a clamping ring groove 10 is formed between the end of the heat exchange tube 1 and the corresponding positioning step 21. The temperature control assembly includes a bracket 3 and a thermostat 4 installed on the bracket 3, the bracket 3 is provided with a positioning hole 311 and is sleeved in the clamping ring groove 10, the end of the connecting pipe 2 passes through the positioning hole 311, and the bracket 3 is connected to the inner wall of the clamping ring groove 10 by fitting. In the heat exchanger 100, the bracket 3 is sleeved in the clamping ring groove 10 through the positioning hole 311, so that the clamping ring groove 10 forms a positioning clamp for the bracket 3, realizes the pre-positioning of the bracket 3 during installation, and improves the installation accuracy of the bracket 3. At the same time, the bracket 3 is fitted and connected to the inner wall of the clamping ring groove 10, which increases the contact area between the heat exchange tube 1 and the connecting tube 2 and the bracket 3, thereby improving the heat transfer efficiency between the heat exchange tube 1 and the connecting tube 2 and the bracket 3, and improving the measurement accuracy of the temperature controller 4.

[0039] Specifically, when the heat exchange tube 1 is assembled with the connecting tube 2, a certain length of the connecting tube 2 is reserved relative to the end of the heat exchange tube 1, so that a clamping ring groove 10 is formed between the positioning step 21 and the heat exchange tube 1. When the heat exchanger 100 is assembled, after the heat exchange tube 1 is installed, the bracket 3 fits the end face of the end of the heat exchange tube 1 and the positioning hole 311 is coaxially arranged with the heat exchange tube 1. Then, the connecting tube 2 passes through the positioning hole 311 and extends into the corresponding heat exchange tube 1 until the end of the heat exchange tube 1 and the positioning step 21 of the connecting tube 2 clamp the bracket 3, thereby achieving the pre-positioning of the bracket 3. Finally, the heat exchange tube 1, the connecting tube 2 and the bracket 3 are welded together through welding operations, thereby achieving the axial installation of the bracket 3 through the existing structure of the heat exchanger 100.

[0040] like Figure 3 to Figure 5 As shown, the bracket 3 includes a positioning plate 31 and a mounting plate 32 connected at an acute angle, the positioning plate 31 is provided with a positioning hole 311, the thermostat 4 is mounted on the mounting plate 32, and the side of the mounting plate 32 away from the thermostat 4 abuts against the connecting pipe 2. Figure 5 As shown, the angle α between the positioning plate 31 and the mounting plate 32 is an acute angle, so that when the positioning plate 31 is installed in the clamping ring groove 10, the mounting plate 32 can be tightly attached to the connecting pipe 2, further increasing the contact area between the bracket 3 and the connecting pipe 2, increasing the heat transfer efficiency between the connecting pipe 2 and the bracket 3, and helping to improve the measurement accuracy of the thermostat 4. It should be noted that the acute angle α between the positioning plate 31 and the mounting plate 32 is 45° to 90°. Specifically, the size of the acute angle α can be flexibly adjusted according to the installation conditions, and it is only necessary to ensure that the mounting plate 32 is tightly attached to the connecting pipe 2.

[0041] Specifically, one side of the positioning plate 31 along the thickness direction is fitted with the axial end face of the end of the heat exchange tube 1, and the other side of the positioning plate 31 along the thickness direction is fitted with the side face of the positioning step 21, and the inner wall of the positioning hole 311 is fitted with the inner bottom wall of the clamping ring groove 10, so that when the positioning plate 31 is clamped in the clamping ring groove 10, the positioning plate 31 can fit with the inner wall of the clamping ring groove 10, that is, the positioning plate 31 is respectively in contact with the connecting tube 2, the positioning step 21 on the connecting tube 2 and the end face of the end of the heat exchange tube 1, thereby increasing the heat conduction area, and at the same time, the positioning plate 31 and the mounting plate 32 can transfer heat to the thermostat 4, thereby improving the overall heat transfer efficiency of the bracket 3.

[0042] like Figure 4 and Figure 5 As shown, one end of the thermostat 4 is plugged into the mounting plate 32, and the other end of the thermostat 4 is fastened to the mounting plate 32 by a fastener. Specifically, the mounting plate 32 is provided with a mounting hole 321, and the thermostat 4 is provided with an assembly hole, and the mounting hole 321 is connected to the assembly hole by a fastener. The fastener of this embodiment is a bolt. The housing of the thermostat 4 is provided with an assembly hole. When the thermostat 4 is installed on the mounting plate 32, the assembly hole is coaxially connected with the mounting hole 321 on the mounting plate 32, and the bolt passes through the coaxial mounting hole 321 and the assembly hole in sequence, so that the thermostat 4 is bolted to the mounting plate 32, which not only realizes the stable installation of the thermostat 4, but also improves the disassembly and assembly efficiency of the thermostat 4. The mounting plate 32 is also provided with a socket 322, and one end of the thermostat 4 is plugged into the socket 322. Through the plug-in fit between the thermostat 4 and the socket 322, on the basis of the bolt connection between the thermostat 4 and the mounting plate 32, the use of fasteners is reduced, the stability of the installation of the thermostat 4 is further improved, and the pre-positioning of the thermostat 4 is realized, which facilitates the rapid alignment of the assembly hole of the thermostat 4 with the mounting hole 321 of the mounting plate 32, thereby improving the installation efficiency of the thermostat 4. Specifically, when installing the thermostat 4, the housing of the thermostat 4 is first plug-in fit with the socket 322 to realize the pre-positioning of the thermostat 4, at which time the assembly hole of the thermostat 4 is aligned with the mounting hole 321 of the mounting plate 32, and finally the thermostat 4 is installed on the mounting plate 32 by fasteners.

[0043] In one embodiment, if Figure 5As shown, the positioning plate 31 is provided with a guide opening 312, which penetrates a side wall of the positioning plate 31 and communicates with the positioning hole 311. The end of the connecting pipe 2 slides into or out of the positioning hole 311 through the guide opening 312 in the radial direction, so that the bracket 3 can be radially installed in the clamping ring groove 10 through the guide opening 312. Specifically, when the thermostat 4 or the bracket 3 needs to be maintained or replaced, it is only necessary to remove the soldering and pull the positioning plate 31 out of the clamping ring groove 10 in the radial direction of the connecting pipe 2. When the bracket 3 is reassembled, the guide opening 312 of the positioning plate 31 is aligned with the clamping ring groove 10 and then inserted in the radial direction of the connecting pipe 2, so that the positioning plate 31 is re-installed in the clamping ring groove 10, and finally the welding operation is performed, so that the radial disassembly and assembly of the bracket 3 is realized.

[0044] It should be noted that the bracket 3 of this embodiment is a copper bracket, which has a high thermal conductivity, ensuring that the bracket 3 has a good heat transfer efficiency. In addition, the copper bracket has good ductility and is easy to deform. In other embodiments, the bracket 3 can also be an aluminum bracket or other metal brackets with high thermal conductivity and good ductility, which are not specifically limited here.

[0045] In one embodiment, if Figure 6 As shown, the minimum width H of the guide opening 312 is smaller than the diameter D of the positioning hole 311 to prevent the positioning plate 31 from sliding out of the clamping ring groove 10 when the bracket 3 is radially installed, thereby ensuring the pre-positioning of the bracket 3 during radial installation.

[0046] like Figure 5 and Figure 6 As shown, the guide opening 312 includes two guide bevels 3121 that are arranged opposite to each other and extend outwardly in an inclined manner to form an entrance that gradually expands from the inside to the outside. The angle β between the two guide bevels 3121 of this embodiment is 90°. In other embodiments, the angle β can also be other angles. By setting the guide bevels 3121, the guide opening 312 has a better guiding effect, and there is no need to accurately align the guide opening 312 with the clamping ring groove 10, which facilitates the positioning plate 31 to be quickly inserted into the clamping ring groove 10 along the radial direction of the connecting pipe 2, thereby improving the radial disassembly and assembly efficiency of the bracket 3.

[0047] Furthermore, a rounded structure is provided at the connection between the guide opening 312 and the positioning hole 311 and at the connection between the guide opening 312 and the outer wall of the positioning plate 31. By providing the rounded structure, the sharp part of the surface of the guide opening 312 is eliminated, and the guide opening 312 is prevented from scratching the connecting pipe 2 and causing water leakage when the bracket 3 is inserted and removed along the radial direction of the connecting pipe 2, thereby improving the protection of the connecting pipe 2 and achieving the safety of the installation process of the bracket 3.

[0048] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A heat exchanger, characterized in that: It comprises a heat exchange tube (1), a connecting tube (2) and a temperature control assembly, wherein the end of the connecting tube (2) is plugged into and connected to the end of the heat exchange tube (1) and is provided with a positioning step (21), and a clamping ring groove (10) is formed between the end of the heat exchange tube (1) and the corresponding positioning step (21); The temperature control assembly comprises a bracket (3) and a temperature controller (4) mounted on the bracket (3); the bracket (3) is provided with a positioning hole (311) and is sleeved in the clamping ring groove (10) through the positioning hole (311); the end of the connecting pipe (2) passes through the positioning hole (311) and the bracket (3) is in contact with the inner wall of the clamping ring groove (10).

2. The heat exchanger according to claim 1, characterized in that: The bracket (3) comprises a positioning plate (31) and a mounting plate (32) connected at an acute angle, the positioning plate (31) being provided with the positioning hole (311), the thermostat (4) being mounted on the mounting plate (32), and the side of the mounting plate (32) facing away from the thermostat (4) being in contact with the connecting pipe (2).

3. The heat exchanger according to claim 2, characterized in that: The acute angle between the positioning plate (31) and the mounting plate (32) is 45° to 90°.

4. The heat exchanger according to claim 2, characterized in that: One side of the positioning plate (31) along the thickness direction is in contact with the axial end surface of the end of the heat exchange tube (1), and the other side of the positioning plate (31) along the thickness direction is in contact with the side surface of the positioning step (21); the inner wall of the positioning hole (311) is in contact with the inner bottom wall of the clamping ring groove (10).

5. The heat exchanger according to claim 2, characterized in that: The positioning plate (31) is provided with a guide opening (312), the guide opening (312) passes through a side wall of the positioning plate (31) and is connected to the positioning hole (311), and the end of the connecting pipe (2) slides into or out of the positioning hole (311) in the radial direction through the guide opening (312).

6. The heat exchanger according to claim 5, characterized in that The minimum width of the guide opening (312) is smaller than the diameter of the positioning hole (311).

7. The heat exchanger according to claim 5, characterized in that A fillet structure is provided at the connection point between the guide opening (312) and the positioning hole (311) and at the connection point between the guide opening (312) and the outer side wall of the positioning plate (31).

8. The heat exchanger according to claim 2, characterized in that: One end of the thermostat (4) is plugged into and matched with the mounting plate (32), and the other end of the thermostat (4) is fastened to the mounting plate (32) via a fastener.

9. The heat exchanger according to claim 8, characterized in that The mounting plate (32) is provided with a socket (322), and one end of the temperature controller (4) is plugged into the socket (322).

10. A gas water heater, characterized in that: The heat exchanger comprises the heat exchanger according to any one of claims 1 to 9.

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