Heat exchanger and water purifier comprising same

Abstract

The heat exchanger is applied to the field of water purifiers, the heat exchanger comprises an inner pipe and an outer pipe, the inner diameter of the outer pipe is larger than the outer diameter of the inner pipe, the outer pipe is arranged outside the inner pipe in a sleeved mode, a plurality of supporting pieces are arranged between the outer pipe and the inner pipe in the circumferential direction, and one ends of the supporting pieces are connected with the outer wall of the inner pipe. And the other end is connected with the inner wall of the outer pipe so that the inner pipe and the outer pipe are coaxial. The water purifier comprises the heat exchanger. The inner diameter of the outer pipe is larger than the outer diameter of the inner pipe, so that the outer pipe is sleeved outside the inner pipe, the two ends of the supporting piece are connected with the outer wall of the inner pipe and the inner wall of the outer pipe respectively, and therefore the inner pipe is supported and erected in the outer pipe, the axis of the inner pipe coincides with the axis of the outer pipe, and the effect that the inner pipe and the outer pipe are coaxial is achieved. The heat exchanger adopting the structure is high in coaxiality and high in compressive strength, the uniformity of the heat exchange process of the heat exchanger can be improved, and the phenomena that the water temperature changes violently and the temperature is suddenly high and suddenly low are prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of water purifier, especially a heat exchanger and a water purifier containing the same. BACKGROUND

[0002] Now with people's health concern, the campus water purifier is equipped with a heat exchanger, and the boiled water is changed to warm boiled water and then discharged. Although the heat exchanger is coaxial in theory, there is coaxial deviation in actual production, when the coaxiality of the heat exchanger is low, the contact between the cooling water flowing through the outer tube and the outer wall of the inner tube flowing through the hot water is uneven, which leads to uneven heat exchange, and uneven heat exchange leads to rapid change of water temperature, and the temperature is high and low. SUMMARY

[0003] The utility model solves the technical problem that the inner tube and the outer tube of the heat exchanger are eccentric in actual production, and provides a heat exchanger and a water purifier containing the same.

[0004] The utility model solves the above technical problem through the following technical scheme:

[0005] The utility model provides a kind of heat exchanger, it is applied to water purifier, the heat exchanger includes inner tube and outer tube, the outer tube inner diameter is greater than the outer diameter of the inner tube and the outer tube is set on the outer of the inner tube, the outer tube and the inner tube are peripherally arranged with several support pieces, one end of several support pieces is connected with the outer wall of the inner tube, and the other end is connected with the inner wall of the outer tube to make the inner tube and the outer tube coaxial.

[0006] In the scheme, the outer tube is set outside the inner tube by making the outer tube inner diameter greater than the inner tube outer diameter, and the two ends of the support piece are connected with the inner tube outer wall and the outer tube inner wall respectively, so as to lift the inner tube and set the inner tube in the outer tube, so that the axis of the inner tube and the outer tube coincides, that is, the effect of the inner and outer tube coaxial. The heat exchanger with this structure has high coaxiality and high compressive strength, can improve the uniformity of the heat exchange process of the heat exchanger, prevent the phenomenon of rapid change of water temperature and high and low temperature.

[0007] Preferably, one end of the inner tube can pass into the first liquid, the other end is connected to user end, flow-through cavity is arranged between adjacent two support pieces, the second liquid can pass through the flow-through cavity, and the second liquid has a temperature difference with the first liquid.

[0008] In the scheme, the heat exchange between the first liquid and the second liquid occurs by the temperature difference between the first liquid and the second liquid, so as to realize the heating or cooling of the first liquid, so that the temperature of the first liquid reaches the required temperature, and then is delivered to the user end.

[0009] Preferably, one end of the outer tube is provided with a first flow-through opening for discharging the second liquid, and the outer tube is further provided with a first buffer cavity, the diameter of the first buffer cavity being greater than the outer diameter of the outer tube, and the first buffer cavity communicates the flow-through cavity with the first flow-through opening; and / or the other end of the outer tube is provided with a second flow-through opening for introducing the second liquid, and the outer tube is further provided with a second buffer cavity, the diameter of the second buffer cavity being greater than the outer diameter of the outer tube, and the second buffer cavity communicates the flow-through cavity with the second flow-through opening.

[0010] In this scheme, the diameters of the first buffer cavity and the second buffer cavity are greater than the outer diameter of the outer tube, that is, the two buffer cavities can store the second liquid, and the pressure fluctuation and flow change caused by discharging the fluid through the first flow-through opening can be absorbed by storing the second liquid in the first buffer cavity, and similarly, the pressure fluctuation and flow change caused by introducing the fluid through the second flow-through opening can be absorbed by storing the second liquid in the first buffer cavity, thereby reducing the influence of the pressure fluctuation and flow change on the whole flow-through cavity, and further stabilizing the temperature of the second liquid after heat exchange under relatively stable pressure and flow conditions.

[0011] Preferably, the support member is provided with an auxiliary flow channel, the auxiliary flow channel penetrating the support member from the extension direction of the support member, and the auxiliary flow channel communicating the second flow-through opening.

[0012] In this scheme, the temperature of the first liquid in the inner tube is partially transferred to the support member, and the second liquid is introduced into the auxiliary flow channel from the second flow-through opening, so that the second liquid exchanges heat with the support member inside the support member, and then exchanges heat with the inner tube and the first liquid, and such a structure can further improve the heat exchange efficiency and make the heat exchange more uniform.

[0013] Preferably, the inner tube is provided with a first blocking member at the end close to the first flow-through opening, and the first blocking member abuts the end of the outer tube from the outer wall of the inner tube; and / or the inner tube is provided with a second blocking member at the end close to the second flow-through opening, and the second blocking member abuts the end of the outer tube from the outer wall of the inner tube.

[0014] In this scheme, the first blocking member and the second blocking member can block the flow-through cavity, thereby avoiding the waste of resources caused by the leakage of liquid at both ends of the flow-through cavity, and in the case of blocking at both ends of the flow-through cavity, the flow-through opening can be provided at any position on the side wall of the outer tube, so that the position of the flow-through opening can meet the needs of different application scenarios, thereby improving the versatility of the heat exchanger. At the same time, due to the existence of the first blocking member and the second blocking member, the connection area between the inner tube and the outer tube is increased, and the connection strength is further improved.

[0015] Preferably, the inner tube is provided with one end of the first blocking member extending out of the outer tube, the first blocking member is arranged on the part of the inner tube extending out of the outer tube, and the first blocking member extends away from the inner tube from the outer wall of the inner tube and abuts against the end of the outer tube; and / or, the inner tube is provided with one end of the second blocking member extending out of the outer tube, the second blocking member is arranged on the part of the inner tube extending out of the outer tube, and the second blocking member extends away from the inner tube from the outer wall of the inner tube and abuts against the end of the outer tube.

[0016] In the present solution, since the first blocking member and the second blocking member are arranged on the part of the inner tube extending out of the outer tube, it is convenient to realize the connection between the first blocking member or the second blocking member and the outer tube, and it is also convenient to check the connection state between the first blocking member or the second blocking member and the outer tube.

[0017] Preferably, a first sealing member is arranged between the first blocking member and the end of the outer tube, and the first sealing member abuts against the first blocking member and the end of the outer tube; and / or, a second sealing member is arranged between the second blocking member and the end of the outer tube, and the second sealing member abuts against the second blocking member and the end of the outer tube.

[0018] In the present solution, the sealing performance of the blocking member can be further improved by arranging the first sealing member and the second sealing member.

[0019] Preferably, the cross section of the support member gradually decreases in the direction from the outer tube to the inner tube.

[0020] In the present solution, the cross section of the support member is reduced, i.e. a slope is formed on the side surface of the support member, so that the second liquid is guided to the outer wall of the inner tube when flowing through the support member, thereby making the second liquid adhere to the outer wall of the inner tube to further improve the heat exchange effect.

[0021] A water purifier comprising the heat exchanger as described above.

[0022] In the present solution, the outer tube is sleeved on the outer tube of the inner tube by making the inner diameter of the outer tube greater than the outer diameter of the inner tube, and the two ends of the support member are connected to the outer wall of the inner tube and the inner wall of the outer tube respectively, so as to support the inner tube and erect the inner tube in the outer tube, so that the axis of the inner tube coincides with the axis of the outer tube, i.e. the effect of coaxiality of the inner tube and the outer tube is achieved. The heat exchanger with such a structure has high coaxiality and high compressive strength, and can improve the uniformity of the heat exchange process of the heat exchanger.

[0023] Preferably, a flow passage is arranged between two adjacent support members, the inner tube can pass hot water, the flow passage can pass cold water, a first flow passage for discharging cold water is arranged on the flow passage, and the water purifier further comprises a water storage heat tank connected to the first flow passage, and the water storage heat tank is used for heating water in the tank.

[0024] In the scheme, the water storage heat tank is communicated with the first flow-through port, the temperature of the hot water after heat exchange is transferred to the cold water, the hot water becomes warm water and is discharged, the cold water in the flow-through cavity is heated after heat exchange and is discharged to the heat tank through the first flow-through port, and the preheating of the cold water through the heat exchange process can reduce the energy consumption of the water storage heat tank for re-heating.

[0025] The positive progress effect of the utility model lies in:

[0026] The heat exchanger and the water purifier comprising the same have the advantages that the outer pipe is sleeved on the inner pipe by the outer diameter of the outer pipe being larger than the outer diameter of the inner pipe, the two ends of the supporting member are connected with the outer wall of the inner pipe and the inner wall of the outer pipe respectively, the inner pipe is supported and arranged in the outer pipe, the axis of the inner pipe coincides with the axis of the outer pipe, and the coaxial effect of the inner pipe and the outer pipe is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a radial sectional view of the heat exchanger of the utility model embodiment

[0028] Figure 2 It is an axial sectional view of the heat exchanger of the utility model embodiment

[0029] Figure 3 It is a perspective view of the heat exchanger of the utility model embodiment

[0030] Figure 4 It is a perspective view of the inner pipe of the heat exchanger of the utility model embodiment

[0031] REFERENCE SIGNS:

[0032] Heat exchanger 100

[0033] Outer pipe 1

[0034] Inner pipe 2

[0035] Supporting member 3

[0036] Flow-through cavity 4

[0037] First flow-through port 5

[0038] First buffer cavity 6

[0039] Second flow-through port 7

[0040] Second buffer cavity 8

[0041] Auxiliary flow channel 9

[0042] First plugging member 10

[0043] Second plugging member 11

[0044] First sealing member 12

[0045] Second seal 13 DETAILED DESCRIPTION

[0046] The utility model is more clearly and completely illustrated below with a preferred embodiment and in connection with the drawings.

[0047] As Figures 1-4 shown, the embodiment provides a heat exchanger 100 applied to a water purifier, the heat exchanger 100 comprising an inner tube 2 and an outer tube 1, the outer tube 1 having an inner diameter greater than an outer diameter of the inner tube 2 and being sleeved on the outer tube 2, a plurality of support members 3 being circumferentially arranged between the outer tube 1 and the inner tube 2, one end of each of the plurality of support members 3 being connected to an outer wall of the inner tube 2, and the other end being connected to an inner wall of the outer tube 1 so that the inner tube 2 is coaxial with the outer tube 1.

[0048] In this way, the outer tube 1 is sleeved on the outer tube 2 by virtue of the outer tube 1 having an inner diameter greater than an outer diameter of the inner tube 2, and the two ends of each of the plurality of support members 3 are connected to the outer wall of the inner tube 2 and the inner wall of the outer tube 1 respectively, thereby supporting the inner tube 2 and erecting the inner tube 2 in the outer tube 1, so that the axis of the inner tube 2 coincides with that of the outer tube 1, i.e., the effect of coaxiality of the inner tube 2 and the outer tube 1 is achieved. The heat exchanger 100 with the structure has high coaxiality and high compressive strength, and can improve the uniformity of the heat exchange process of the heat exchanger 100 and prevent the phenomenon of sharp change in water temperature and high-low temperature.

[0049] In the embodiment, the plurality of support members 3 are circumferentially arranged between the outer tube 1 and the inner tube 2, and have a certain interval therebetween, and the length of the interval can be adjusted according to the number of the plurality of support members 3, which is not limited in the embodiment. Figure 1 As Figure 1 illustratively shown, the plurality of support members 3 are four, and the four support members 3 are oppositely arranged relative to the axis of the inner tube 2 and are arranged around the inner tube 2. The two ends of each of the plurality of support members 3 are connected to the inner tube 2 and the outer tube 1 respectively, and the plurality of support members 3 can be fixedly connected to the inner tube 2 or the outer tube 1 or can be integrally formed, and preferably, the plurality of support members 3 are integrally formed with the inner tube 2. This is because the outer tube 1 is generally made of metal with high strength and corrosion resistance, and the inner tube 2 is generally made of plastic, and the plurality of support members 3 are integrally formed with the inner tube 2, which is low in cost and easy to process.

[0050] Specifically, one end of the inner tube 2 can pass into a first liquid, and the other end is connected to a user end, a flow-through cavity 4 is arranged between adjacent two of the plurality of support members 3, a second liquid can pass through the flow-through cavity 4, and the second liquid has a temperature difference with the first liquid.

[0051] In this way, heat exchange occurs between the first liquid and the second liquid by virtue of the temperature difference between the first liquid and the second liquid, thereby achieving heating or cooling of the first liquid, so that the temperature of the first liquid reaches a required temperature, and then the first liquid is delivered to the user end.

[0052] In the embodiment, asFigure 1 and Figure 4 As shown in the figure, the support 3 can extend along the axial direction of the inner tube 2 from one end of the inner tube 2 to the other end of the inner tube 2, thereby dividing the flow-through cavity 4 between the outer tube 1 and the inner tube 2 into several flow passages, and the second liquid is also dispersed into the several flow passages. The second liquid can be a liquid, which has good heat conduction and incompressibility, can improve the heat exchange effect, and at the same time, reduce the influence of the pressure change of the liquid in the pipeline on the flow, and is preferably cold water. The first liquid is selected according to the needs of the heat exchanger 100. The heat exchanger 100 is mainly applied to a water purifier, so the first liquid can be selected as hot water.

[0053] Specifically, the outer tube 1 is provided with a flow-through port and a buffer cavity.

[0054] In a first embodiment, one end of the outer tube 1 is provided with a first flow-through port 5 for discharging the second liquid, and the outer tube 1 is further provided with a first buffer cavity 6, the diameter of the first buffer cavity 6 being greater than the outer diameter of the outer tube 1, and the first buffer cavity 6 communicates the flow-through cavity 4 with the first flow-through port 5.

[0055] In a second embodiment, the other end of the outer tube 1 is provided with a second flow-through port 7 for introducing the second liquid, and the outer tube 1 is further provided with a second buffer cavity 8, the diameter of the second buffer cavity 8 being greater than the outer diameter of the outer tube 1, and the second buffer cavity 8 communicates the flow-through cavity 4 with the second flow-through port 7.

[0056] In a third embodiment, one end of the outer tube 1 is provided with a first flow-through port 5 for discharging the second liquid, and the outer tube 1 is further provided with a first buffer cavity 6, the diameter of the first buffer cavity 6 being greater than the outer diameter of the outer tube 1, and the first buffer cavity 6 communicates the flow-through cavity 4 with the first flow-through port 5. The other end of the outer tube 1 is provided with a second flow-through port 7 for introducing the second liquid, and the outer tube 1 is further provided with a second buffer cavity 8, the diameter of the second buffer cavity 8 being greater than the outer diameter of the outer tube 1, and the second buffer cavity 8 communicates the flow-through cavity 4 with the second flow-through port 7. The preferred scheme is the third embodiment.

[0057] In this way, the diameters of the first buffer cavity 6 and the second buffer cavity 8 are greater than the outer diameter of the outer tube 1, that is, the two buffer cavities can store the second liquid. By storing the second liquid in the first buffer cavity 6, the pressure fluctuation and flow change caused by the fluid discharged through the first flow-through port 5 can be absorbed. Similarly, by storing the second liquid in the first buffer cavity 6, the pressure fluctuation and flow change caused by the fluid introduced through the second flow-through port 7 can be absorbed, thereby further reducing the influence of the pressure fluctuation and flow change on the overall flow-through cavity 4.

[0058] Further, in the present embodiment, the closer the first buffer cavity 6 is to the first flow-through port 5 or the closer the second buffer cavity 8 is to the second flow-through port 7, the better the buffering effect is. Preferably, as shown in the figure, the first buffer cavity 6 is located at the other end of the outer tube 1, and the second buffer cavity 8 is located at one end of the outer tube 1.Figure 3 As shown, the first flow-through opening 5 and the second flow-through opening 7 are respectively provided with the first buffer cavity 6 and the second buffer cavity 8, and the first flow-through opening 5 and the second flow-through opening 7 are respectively arranged on the cavity wall of the first buffer cavity 6 and the second buffer cavity 8.

[0059] Specifically, the support 3 is provided with an auxiliary flow channel 9, the auxiliary flow channel 9 penetrates the support 3 from the extension direction of the support 3, and the auxiliary flow channel 9 communicates with the second flow-through opening 7.

[0060] In this way, part of the temperature of the first liquid in the inner tube 2 is transferred to the support 3, the second liquid is introduced into the auxiliary flow channel 9 from the second flow-through opening 7, the second liquid exchanges heat with the support 3 inside the support 3, and then exchanges heat with the inner tube 2 and the first liquid. By adopting such a structure, the heat exchange efficiency can be further improved, and the heat exchange is more uniform.

[0061] In the embodiment, as shown, Figure 2 The auxiliary flow channel 9 can be multiple, and the multiple auxiliary flow channels 9 are arranged in the direction from the outer wall of the inner tube 2 to the inner wall of the outer tube 1. Such a structure can further increase the contact area of the second liquid with the support 3, improve the heat exchange efficiency, and ensure the uniformity of the heat exchange.

[0062] Specifically, the inner tube 2 is further provided with a plugging member.

[0063] In a first implementation, the inner tube 2 is provided with a first plugging member 10 at one end close to the first flow-through opening 5, and the first plugging member 10 abuts against the end of the outer tube 1 from the outer wall of the inner tube 2.

[0064] In a second implementation, the inner tube 2 is provided with a second plugging member 11 at one end close to the second flow-through opening 7, and the second plugging member 11 abuts against the end of the outer tube 1 from the outer wall of the inner tube 2.

[0065] In a third implementation, the inner tube 2 is provided with a first plugging member 10 at one end close to the first flow-through opening 5, and the first plugging member 10 abuts against the end of the outer tube 1 from the outer wall of the inner tube 2. The inner tube 2 is provided with a second plugging member 11 at one end close to the second flow-through opening 7, and the second plugging member 11 abuts against the end of the outer tube 1 from the outer wall of the inner tube 2. The third implementation is a preferred embodiment.

[0066] In this way, by arranging the first plugging member 10 and the second plugging member 11, the flow-through cavity 4 can be plugged, thereby avoiding the waste of resources caused by the leakage of liquid at both ends of the flow-through cavity 4. In the case of plugging at both ends of the flow-through cavity 4, the flow-through opening can be arranged at any position on the side wall of the outer tube 1, so that the arrangement position of the flow-through opening can meet the needs of different application scenarios, thereby improving the versatility of the heat exchanger 100. At the same time, due to the existence of the first plugging member 10 and the second plugging member 11, the connection area between the inner tube 2 and the outer tube 1 is increased, and the connection strength is further improved.

[0067] In this embodiment, as Figure 2 As shown, one end of the inner tube 2 with a first sealing element 10 extends out of the outer tube 1. The first sealing element 10 is located at the portion of the inner tube 2 extending out of the outer tube 1, extending from the outer wall of the inner tube 2 away from the inner tube 2 and abutting against the end of the outer tube 1. Similarly, one end of the inner tube 2 with a second sealing element 11 extends out of the outer tube 1, also located at the portion of the inner tube 2 extending out of the outer tube 1, extending from the outer wall of the inner tube 2 away from the inner tube 2 and abutting against the end of the outer tube 1. Because the first sealing element 10 and the second sealing element 11 are located at the portion of the inner tube 2 extending out of the outer tube 1, it facilitates the connection between the first sealing element 10 or the second sealing element 11 and the outer tube 1, and also facilitates the inspection of the connection status between the first sealing element 10 or the second sealing element 11 and the outer tube 1. In another embodiment, the two ends of the inner tube 2 do not extend out of the outer tube 1, and the sealing member is disposed inside the outer tube 1, extending away from the inner tube 2 and abutting against the inner wall of the outer tube 1.

[0068] Specifically, a sealing element is provided between the plug and the end of the outer tube 1.

[0069] In the first embodiment, a first sealing member 12 is provided between the first sealing member 10 and the end of the outer tube 1, and the first sealing member 12 abuts against the first sealing member 10 and the end of the outer tube 1.

[0070] In the second embodiment, a second sealing element 13 is provided between the second sealing element 11 and the end of the outer tube 1, and the second sealing element 13 abuts against the second sealing element 11 and the end of the outer tube 1.

[0071] The third embodiment is that a first sealing member 12 is provided between the first sealing member 10 and the end of the outer tube 1, and the first sealing member 12 abuts against the first sealing member 10 and the end of the outer tube 1. A second sealing member 13 is provided between the second sealing member 11 and the end of the outer tube 1, and the second sealing member 13 abuts against the second sealing member 11 and the end of the outer tube 1. The preferred embodiment is the third embodiment.

[0072] Thus, by providing the first seal 12 and the second seal 13, the sealing performance of the sealing element can be further increased.

[0073] In this embodiment, the sealing element can be a rubber sealing ring, and there can be multiple rubber sealing rings fitted between the sealing element and the end of the outer tube 1. In other embodiments, the sealing element can be other sealing structures.

[0074] Specifically, the cross-section of the support member 3 gradually decreases from the outer tube 1 to the inner tube 2.

[0075] Therefore, the cross section of the support 3 is reduced, i.e. the slope is formed on the side of the support 3, so that the second liquid is guided to the outer wall of the inner tube 2 when flowing through the support 3, and the second liquid is attached to the outer wall of the inner tube 2 to further improve the heat exchange effect.

[0076] The embodiment also provides a water purifier, which comprises the heat exchanger 100.

[0077] Therefore, the outer tube 1 is sleeved on the outer tube 2 by the outer diameter of the outer tube 1 being greater than the outer diameter of the inner tube 2, the two ends of the support 3 are connected to the outer wall of the inner tube 2 and the inner wall of the outer tube 1 respectively, so as to support the inner tube 2 and set the inner tube 2 in the outer tube 1, and the axis of the inner tube 2 coincides with the axis of the outer tube 1, i.e. the coaxial effect of the inner tube 2 and the outer tube 1 is achieved. The heat exchanger 100 with the structure has high coaxiality and high compressive strength, and can improve the uniformity of the heat exchange process of the heat exchanger 100.

[0078] In the embodiment, the flow cavity 4 is arranged between the two adjacent supports 3, the inner tube 2 can pass through hot water, the flow cavity 4 can pass through cold water, the first flow port 5 for discharging cold water is arranged on the flow cavity 4, and the water purifier further comprises a water storage heat tank connected with the first flow port 5, and the water storage heat tank is used for heating water in the tank. The water storage heat tank is connected with the first flow port 5, the temperature of the hot water after heat exchange is transferred to the cold water, the hot water becomes warm water and is discharged, the cold water in the flow cavity 4 is heated and the temperature rises after heat exchange, and the cold water is discharged to the heat tank through the first flow port 5. Since the cold water is preheated through the heat exchange process, the energy consumption of the water storage heat tank for re-heating can be reduced.

[0079] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A heat exchanger applied to a water purifier, characterized in that, The heat exchanger comprises an inner tube and an outer tube, the outer tube has a larger inner diameter than the outer diameter of the inner tube, and the outer tube is sleeved on the outer tube, a plurality of supports are arranged between the outer tube and the inner tube in the circumferential direction, one end of the plurality of supports is connected with the outer wall of the inner tube, and the other end is connected with the inner wall of the outer tube to make the inner tube coaxial with the outer tube.

2. The heat exchanger of claim 1, wherein One end of the inner tube can pass into the first liquid, the other end is connected to the user end, a flow-through cavity is arranged between adjacent two supports, the flow-through cavity can pass through the second liquid, and the second liquid has a temperature difference with the first liquid.

3. The heat exchanger of claim 2, wherein One end of the outer tube is provided with a first flow-through port for discharging the second liquid, and the outer tube is further provided with a first buffer cavity, the diameter of the first buffer cavity is larger than the outer diameter of the outer tube, and the first buffer cavity communicates the flow-through cavity with the first flow-through port. And / or, the other end of the outer tube is provided with a second flow-through port for passing into the second liquid, and the outer tube is further provided with a second buffer cavity, the diameter of the second buffer cavity is larger than the outer diameter of the outer tube, and the second buffer cavity communicates the flow-through cavity with the second flow-through port.

4. The heat exchanger of claim 3, wherein Auxiliary flow channels are formed in the supports, the auxiliary flow channels penetrate the supports from the extension direction of the supports, and the auxiliary flow channels communicate with the second flow-through port.

5. The heat exchanger of claim 3, wherein The first flow-through port is formed in the side wall of the outer tube, the inner tube is provided with a first plugging member at one end close to the first flow-through port, and the first plugging member abuts against the end of the outer tube from the outer wall of the inner tube. And / or, the second flow-through port is formed in the side wall of the outer tube, the inner tube is provided with a second plugging member at one end close to the second flow-through port, and the second plugging member abuts against the end of the outer tube from the outer wall of the inner tube.

6. The heat exchanger of claim 5, wherein The end of the inner tube provided with the first plugging member protrudes out of the outer tube, the first plugging member is arranged on the part of the inner tube protruding out of the outer tube, and the first plugging member extends away from the inner tube from the outer wall of the inner tube and abuts against the end of the outer tube. And / or, the end of the inner tube provided with the second plugging member protrudes out of the outer tube, the second plugging member is arranged on the part of the inner tube protruding out of the outer tube, and the second plugging member extends away from the inner tube from the outer wall of the inner tube and abuts against the end of the outer tube.

7. The heat exchanger of claim 5, wherein A first sealing member is arranged between the first plugging member and the end of the outer tube, and the first sealing member abuts against the first plugging member and the end of the outer tube. And / or, a second sealing member is arranged between the second plugging member and the end of the outer tube, and the second sealing member abuts against the second plugging member and the end of the outer tube.

8. The heat exchanger of claim 1, wherein The cross section of the support gradually decreases from the direction of the outer tube to the inner tube.

9. A water purifier characterized by comprising: It comprises the heat exchanger of any one of claims 1-8.

10. The water purifier of claim 9, wherein The water purifier comprises two supporting members, a water tank, an inner tube and a water storage heat tank.

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