Heat pump water heater

Abstract

The utility model provides a heat pump water heater, and relates to the technical field of heat exchange. The heat pump water heater comprises an inner container and a heat exchanger, the peripheral wall of the inner container is provided with a first limiting structure and a second limiting structure which are arranged at intervals in the axial direction of the inner container, the heat exchanger comprises a first collecting pipe, a second collecting pipe and a plurality of heat exchange pipes arranged side by side at intervals, and the two ends of each heat exchange pipe communicate with the first collecting pipe and the second collecting pipe correspondingly; the multiple heat exchange pipes are spirally wound and attached to the peripheral wall of the inner container. Wherein the first limiting structure abuts against the side, close to the heat exchange pipe, of the first collecting pipe, the second limiting structure abuts against the side, close to the heat exchange pipe, of the second collecting pipe, the limiting position of at least one of the first limiting structure and the second limiting structure can be movably adjusted on the surface of the inner container, and the first limiting structure and the second limiting structure can be fixed relative to the inner container at the limiting position. Through the first limiting structure and the second limiting structure, the two ends of the heat exchange pipe are tensioned so that the heat exchange pipe can be tightly wound around the inner container, and then the heat exchange efficiency between the heat exchange pipe and the inner container is improved.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a heat pump water heater. Background Art

[0002] The heat pump water heater includes a heat exchanger and a water tank. The heat exchanger includes a plurality of heat exchange tubes, a first header and a second header. The plurality of heat exchange tubes are arranged at intervals. One end of the plurality of heat exchange tubes is connected to the first header and the other end is connected to the second header. The outer peripheral wall of the water tank is provided with a limiting structure, so that the first header and the second header are fixed by the limiting structure, so that the plurality of heat exchange tubes are spirally wound and fit to the outer peripheral wall of the water tank. However, the existing limiting structure is fixedly arranged on the water tank. When the size of the heat exchanger deviates, it is easy to cause the heat exchange tubes of the heat exchanger to not be tightly wound around the water tank or the heat exchanger and the limiting structure cannot be assembled. Utility Model Content

[0003] Based on this, it is necessary to provide a heat pump water heater to ensure the limiting effect by adjusting the limit position when the size of the heat exchanger deviates.

[0004] A heat pump water heater, comprising an inner tank and a heat exchanger, wherein the outer peripheral wall of the inner tank is provided with a first limiting structure and a second limiting structure arranged at intervals along the axial direction thereof, and the heat exchanger comprises a first collecting pipe, a second collecting pipe, and a plurality of heat exchange tubes arranged side by side at intervals, wherein the two ends of each of the heat exchange tubes are respectively connected to the first collecting pipe and the second collecting pipe, and the plurality of heat exchange tubes are spirally wound and adhered to the outer peripheral wall of the inner tank; wherein the first limiting structure abuts against a side of the first collecting pipe close to the heat exchange tube, and the second limiting structure abuts against a side of the second collecting pipe close to the heat exchange tube, and at least one of the first limiting structure and the second limiting structure can movably adjust the limiting position on the surface of the inner tank, and can be fixed relative to the inner tank at the limiting position.

[0005] It is understandable that the heat exchange tube is wound around the inner tank to exchange heat with the liquid in the inner tank. The first header is connected to the inlet of the heat exchange tube so as to divert the heat exchange medium into multiple heat exchange tubes, and the second header is connected to the outlet of the heat exchange tube so as to converge the heat exchange medium after heat exchange. The first header is limited by the first limiting structure, and the second header is limited by the second limiting structure. Both ends of the heat exchange tube are tightened so that the heat exchange tube can be tightly wound around the inner tank, thereby improving the heat exchange efficiency between the heat exchange tube and the inner tank. At the same time, at least one of the first limiting structure and the second limiting structure can movably adjust the limiting position, so as to ensure the limiting effect by adjusting the limiting position when the size of the heat exchanger deviates.

[0006] In one embodiment, at least one of the first limiting structure and the second limiting structure is configured as an elastic member, one end of the elastic member is fixedly connected to the inner container, and the other end is a free end.

[0007] It can be understood that the elastic deformation of the elastic member facilitates flexible adjustment of the limit position according to the size deviation of the heat exchanger.

[0008] In one embodiment, at least one of the first limiting structure and the second limiting structure is slidably connected to the inner container.

[0009] It can be understood that the sliding connection allows for flexible adjustment of the position of the first limiting structure and / or the second limiting structure when the size of the heat exchanger deviates.

[0010] In one of the embodiments, at least one of the first limiting structure and the second limiting structure is provided with a first sliding groove, and the inner liner is provided with a matching portion, the matching portion extends along the circumference of the inner liner, the matching portion extends into the first sliding groove and is movably connected with the groove wall of the first sliding groove; a through hole is provided at the bottom of the first sliding groove, and the matching portion is provided with a plurality of positioning holes arranged at intervals; at least one of the first limiting structure and the second limiting structure also includes a positioning pin, and the positioning pin can be passed through the through hole and the positioning hole and connected to the matching portion.

[0011] It can be understood that the positioning of the first limiting structure or the second limiting structure is achieved by cooperating with the positioning pin and the positioning hole, which is easy to operate.

[0012] In one embodiment, at least one of the first limiting structure and the second limiting structure is provided with a sliding seat and a limiting rod, the sliding seat is connected to the outer peripheral wall of the inner liner, the sliding seat is provided with a second sliding groove, the side wall of the sliding seat is provided with a through opening penetrating along its own thickness direction, and the through opening extends in the same direction as the extension direction of the second sliding groove; the limiting rod has a sliding end, the sliding end is convexly provided on the rod body of the limiting rod, the sliding end is slidably connected to the groove wall of the second sliding groove, and extends out from the through opening; at least one of the first limiting structure and the second limiting structure also includes a locking member, which is connected to the sliding end and locks the sliding end.

[0013] It can be understood that the sliding seat is arranged to facilitate the opening of the second sliding groove, and the side wall of the second sliding groove opens a through hole to facilitate the sliding end of the limiting rod to pass through, thereby causing the sliding end to slide to be just limited to the first collecting pipe or the second collecting pipe, and the sliding end can be locked by the locking member, which is easy to operate.

[0014] In one embodiment, the heat pump water heater further includes a mounting bracket, which is mounted on at least one of the first collecting pipe and the second collecting pipe, and the mounting bracket is provided with a limiting hole, and at least one of the first limiting structure and the second limiting structure is passed through the corresponding limiting hole.

[0015] It can be understood that, through the cooperation between the mounting bracket and the limiting hole, the limiting area is increased, which is conducive to enhancing the limiting effect on the first header and the second header.

[0016] In one of the embodiments, the winding angle α of the heat exchange tube is set between 5° and 12°.

[0017] It can be understood that a proper winding angle α ensures the tightness of the winding while facilitating the spiral winding.

[0018] In one embodiment, the pitch of the spiral winding of the plurality of heat exchange tubes arranged side by side is W, the width of the plurality of heat exchange tubes arranged side by side is L, and 0.7≤L / W≤0.95.

[0019] It can be understood that such a configuration is helpful to ensure the tightness of the spiral winding of the heat exchanger along the axial direction of the inner tank.

[0020] In one of the embodiments, the inner tank is provided with a liquid inlet and a liquid outlet spaced apart along its own axial direction, the liquid outlet is higher than the liquid inlet, and the first limiting structure and the second limiting structure are arranged to avoid the liquid inlet and the liquid outlet; along the first direction, the winding spacing of multiple heat exchange tubes arranged side by side gradually increases.

[0021] It can be understood that the first direction is the direction from the liquid inlet to the liquid outlet along the axis of the inner tank. When in use, the liquid level in the inner tank will gradually decrease, and there will be no liquid near the liquid outlet, while there will always be liquid at the liquid inlet. This arrangement makes the winding density of the heat exchange tube near the liquid inlet larger, and the heat exchange tube can always exchange heat with the liquid at the liquid inlet, thereby improving the heat exchange efficiency.

[0022] In one embodiment, in the heat exchanger, the distance between any two adjacent heat exchange tubes in the plurality of heat exchange tubes arranged side by side is d.

[0023] It can be understood that such an arrangement is used to ensure the tightness between the heat exchange tubes in the heat exchanger and to ensure the firmness of the overall installation of the heat exchanger on the inner tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic structural diagram of a first embodiment of a heat exchanger provided in this application;

[0026] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0027] Figure 3 for Figure 1 A partial enlarged view of point B in the middle;

[0028] Figure 4 A schematic structural diagram of a second embodiment of a heat exchanger provided in this application;

[0029] Figure 5 for Figure 4 A partial enlarged view of point C in the middle;

[0030] Figure 6 for Figure 4 A partial enlarged view of point D in the middle;

[0031] Figure 7 A three-dimensional diagram of a mounting bracket in a heat exchanger provided for this application;

[0032] Figure 8 It is a partial enlarged view of the third embodiment of the heat exchanger provided by the present application;

[0033] Fig. 9 It is a partially enlarged view of the fourth embodiment of the heat exchanger provided in the present application.

[0034] : Illustration numerals: 100, heat pump water heater; 10, inner tank; 101, liquid inlet; 102, liquid outlet; 11, matching part; 111, positioning hole; 20, heat exchanger; 21, first collecting pipe; 22, second collecting pipe; 23, heat exchange tube; 231, fitting section; 232, transition section; 24, mounting bracket; 241, limiting hole; 31, first limiting structure; 32, second limiting structure; 301, first sliding groove; 302, through hole; 303, sliding seat; 3031, second sliding groove; 3032, through hole; 304, limiting rod; 3041, sliding end; 40, positioning pin; 50, locking member. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0036] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0040] See also Figures 1 to 9The present application provides a heat pump water heater 100, which includes an inner tank 10 and a heat exchanger 20. The outer peripheral wall of the inner tank 10 is provided with a first limiting structure 31 and a second limiting structure 32 arranged at intervals along its own axial direction. The heat exchanger 20 includes a first header 21, a second header 22, and a plurality of heat exchange tubes 23 arranged side by side at intervals. The two ends of each heat exchange tube 23 are respectively connected to the first header 21 and the second header 22. The plurality of heat exchange tubes 23 are spirally wound and adhered to the outer peripheral wall of the inner tank 10; wherein the first limiting structure 31 abuts against a side of the first header 21 close to the heat exchange tube 23, and the second limiting structure 32 abuts against a side of the second header 22 close to the heat exchange tube 23. At least one of the first limiting structure 31 and the second limiting structure 32 can movably adjust the limiting position on the surface of the inner tank 10, and can be fixed relative to the inner tank 10 at the limiting position.

[0041] In this way, there is liquid in the inner liner 10, and the heat exchanger 20 is wrapped around the inner liner 10 so as to transfer heat to the liquid through the inner liner 10 to heat the liquid. In the heat exchanger 20, the first header 21 can divert the heat exchange medium into multiple heat exchange tubes 23 to heat the liquid in the inner liner 10. The heat exchange medium after heat exchange is gathered in the second header 22 and flows out through the second header 22. During assembly, the inner liner 10 limits the first header 21 through the first limiting structure 31, and the inner liner 10 limits the second header 22 through the second limiting structure 32, so that both ends of the heat exchanger 20 can be positioned on the outer peripheral wall of the inner liner 10, so as to avoid the heat exchanger 20 being loose at both ends along its own axis, which causes the heat exchange tubes 23 to be unable to be tightly attached to the outer peripheral wall of the inner liner 10. It is the limiting effect of the first limiting structure 31 and the second limiting structure 32 that enables the two ends of the heat exchanger 20 to be tightened along the circumference of the inner tank 10, thereby promoting the heat exchange tube 23 to be tightly wound around the inner tank 10, reducing the gap between the heat exchange tube 23 and the inner tank 10, promoting heat transfer, and improving heat transfer efficiency.

[0042] Furthermore, at least one of the first limiting structure 31 and the second limiting structure 32 can flexibly adjust the limiting position along the circumference of the inner tank 10, wherein the limiting position is the position where the first limiting structure 31 abuts against the first manifold 21, or the position where the second limiting structure 32 abuts against the second manifold 22. In other words, when the heat exchanger 20 has a size deviation, at least one of the first limiting structure 31 and the second limiting structure 32 can flexibly adjust the limiting position, so that its local structure can be offset, or the whole can be moved on the outer peripheral wall of the inner tank 10 to adapt to the size deviation of the heat exchanger 20 and ensure the limiting effect.

[0043] like Figure 1 , Figure 3 , Figure 4 and Figure 6As shown, in some embodiments, at least one of the first limiting structure 31 and the second limiting structure 32 is set as an elastic member, one end of the elastic member is fixedly connected to the inner tank 10, and the other end is a free end, and the free end can be freely stretched, compressed, shaken, etc., so as to adjust the limiting position to adapt to the shorter size of the heat exchanger 20. Taking the second limiting structure 32 as an example, the elastic member can be bent and deformed under the action of external force. When the size of the heat exchanger 20 is shorter, the elastic member is deformed toward the second header 22, and then the elastic member can reach the second header 22. The second header 22 has a pulling force on the elastic member toward the heat exchange tube 23, which makes the elastic member have a tendency to shrink, and then has a limiting effect on the second header 22 away from the heat exchange tube 23, so that the heat exchange tube 23 is tightly wound around the inner tank 10. Specifically, the elastic member is a spring.

[0044] In other embodiments, one of the first limiting structure 31 and the second limiting structure 32 is configured as a fixing rod, and the fixing rod is fixedly connected to the inner tank 10 to rigidly limit the first collecting pipe 21 and / or the second collecting pipe 22 .

[0045] In a specific embodiment, the first limiting structure 31 is set as an elastic member, and the second limiting structure 32 is set as a fixed rod; or, the first limiting structure 31 is set as a fixed rod, and the second limiting structure 32 is set as an elastic member; or, both the first limiting structure 31 and the second limiting structure 32 are set as elastic members.

[0046] In a preferred embodiment, at least one of the first limiting structure 31 and the second limiting structure 32 is slidably connected to the inner liner 10, so as to adjust its limiting position as a whole, thereby adapting to the dimensional deviation of the length of the heat exchanger 20. In a specific embodiment, the first limiting structure 31 is slidably connected to the inner liner 10, and the second limiting structure 32 is fixedly connected to the inner liner 10; or, the second limiting structure 32 is slidably connected to the inner liner 10, and the first limiting structure 31 is fixedly connected to the inner liner 10; or, both the first limiting structure 31 and the second limiting structure 32 are slidably connected to the inner liner 10.

[0047] like Figure 8As shown, in a further embodiment, at least one of the first limiting structure 31 and the second limiting structure 32 is provided with a first sliding groove 301, the inner liner 10 is provided with a matching portion 11, the matching portion 11 extends along the circumference of the inner liner 10, and the matching portion 11 extends into the first sliding groove 301 and is movably connected with the groove wall of the first sliding groove 301; the bottom of the first sliding groove 301 is provided with a through hole 302, and the matching portion 11 is provided with a plurality of positioning holes 111 arranged at intervals; at least one of the first limiting structure 31 and the second limiting structure 32 further includes a positioning pin 40, which can be inserted through the through hole 302 and the positioning hole 111 and connected to the matching portion 11. Taking the second limiting structure 32 provided with the first sliding groove 301 as an example, the positioning pin 40 is inserted through the through hole 302 and the positioning hole 111 to limit the movement of the second limiting structure 32, thereby realizing the position fixation of the second limiting structure 32, so that the second limiting structure 32 can limit the first manifold 21. In other embodiments, the first limiting structure 31 may also be provided with a first sliding groove 301 , which has similar effects to the above and will not be described in detail herein.

[0048] like Fig. 9 As shown, in a further preferred embodiment, at least one of the first limiting structure 31 and the second limiting structure 32 is provided with a sliding seat 303 and a limiting rod 304, the sliding seat 303 is connected to the outer peripheral wall of the inner liner 10, the sliding seat 303 is provided with a second sliding groove 3031, and the side wall of the sliding seat 303 is provided with a through opening 3032 penetrating along its own thickness direction, and the through opening 3032 extends in the same direction as the extension direction of the second sliding groove 3031; the limiting rod 304 has a sliding end 3041, the sliding end 3041 is protruded from the rod body of the limiting rod 304, the sliding end 3041 is slidably connected to the groove wall of the second sliding groove 3031, and extends out from the through opening 3032; at least one of the first limiting structure 31 and the second limiting structure 32 also includes a locking member 50, which is connected to the sliding end 3041 and locks the sliding end 3041.

[0049] In this arrangement, the sliding seat 303 can support the sliding of the limiting rod 304, the sliding end 3041 of the limiting rod 304 can slide along the extension track of the second sliding groove 3031, and the sliding end 3041 can extend out of the through opening 3032 of the groove wall of the second sliding groove 3031, so that the sliding end 3041 is connected and locked with the locking member 50. When the limiting rod 304 moves to the point where it can just limit the first header 21 or the second header 22, the locking member 50 locks the sliding end 3041 to limit the movement of the limiting rod 304. This arrangement can achieve continuous sliding and locking, and is more applicable.

[0050] In a specific embodiment, a connecting hole is provided at the sliding end 3041, and the hole wall of the connecting hole is provided with an internal thread. The locking member 50 is a bolt, which is passed through the connecting hole and threadedly connected to the hole wall of the connecting hole. The head of the bolt can be pressed against the surface of the sliding seat 303 to achieve locking of the sliding end 3041.

[0051] like Fig. 9 As shown, in another specific embodiment, the locking member 50 is a nut, the outer peripheral wall of the sliding end 3041 is provided with an external thread, the nut is sleeved on the sliding end 3041 and threadedly connected to the sliding end 3041, and can be pressed against the surface of the sliding seat 303 to achieve locking of the sliding end 3041.

[0052] The above is merely an example of the locking member 50 , and does not limit the specific structure of the locking member 50 .

[0053] like Figures 4 to 7 As shown, in a further embodiment, the heat pump water heater 100 further includes a mounting bracket 24, the mounting bracket 24 is mounted on at least one of the first manifold 21 and the second manifold 22, the mounting bracket 24 is provided with a limiting hole 241, at least one of the first limiting structure 31 and the second limiting structure 32 is penetrated in the corresponding limiting hole 241, the mounting bracket 24 can limit the first limiting structure 31 or the second limiting structure 32 along the radial direction of the limiting hole 241, and the hole wall of the limiting hole 241 can contact the first limiting structure 31 or the second limiting structure 32 in the circumferential direction, which is conducive to increasing the contact area and improving the limiting effect. In a specific embodiment, the mounting bracket 24 is attached to and connected to at least part of the outer peripheral wall of the first manifold 21 or the second manifold 22.

[0054] like Figures 1 to 6As shown, in a specific embodiment, the inner tank 10 is provided with a liquid inlet 101 and a liquid outlet 102 arranged at intervals along its own axial direction, the liquid outlet 102 is higher than the liquid inlet 101, and the first limiting structure 31 and the second limiting structure 32 are arranged to avoid the liquid inlet 101 and the liquid outlet 102, so as to facilitate the input and output of the liquid in the inner tank 10. Along the first direction, the winding spacing of the multiple heat exchange tubes 23 arranged side by side gradually increases. Among them, the first direction refers to the direction from the liquid inlet 101 to the liquid outlet 102 along the axis of the inner tank 10. The winding spacing of the multiple heat exchange tubes 23 arranged side by side near the liquid inlet 101 of the heat exchanger 20 is greater than the winding spacing of the multiple heat exchange tubes 23 arranged side by side near the liquid outlet 102. Since the liquid outlet 102 is higher than the liquid inlet 101, as the heat pump water heater 100 is used, the water in the inner tank 10 is continuously discharged, and the liquid level at the liquid outlet 102 gradually decreases, so there is often no liquid near the liquid outlet 102. Therefore, the winding pitch of the heat exchanger 20 near the liquid outlet 102 is larger, so that at the liquid outlet 102, the spiral winding of the heat exchanger 20 along the axial direction of the inner tank 10 is relatively sparse, while near the liquid inlet 101, the spiral winding pitch of the heat exchanger 20 along the axial direction of the inner tank 10 is smaller and the winding density is large, thereby ensuring that the liquid near the liquid inlet 101 is fully heated, and helping to reduce the length of the heat exchanger 20, reduce consumables, and reduce production costs.

[0055] like Figure 1 As shown, in a specific embodiment, the winding angle α of the heat exchange tube 23 is set between 5° and 12°. In this way, the heat exchange tube 23 is spirally wound along the axial direction of the inner tank 10, and at the same time, the winding angle α is prevented from being too large, ensuring sufficient winding tightness, so that the heat exchange tube 23 has a longer size for being attached to the inner tank 10, thereby increasing the heat exchange area between the heat exchange tube 23 and the inner tank 10 and improving the heat exchange efficiency. Exemplarily, the winding angle α of the heat exchange tube 23 is 5°, 10° or 12°.

[0056] like Figure 1 As shown, in a specific embodiment, the pitch of the spiral winding of the multiple heat exchange tubes 23 arranged side by side is W, the width of the multiple heat exchange tubes 23 arranged side by side is L, and 0.7≤L / W≤0.95. Among them, since the width of the heat exchanger 20 remains unchanged, the pitch is related to the tightness of the winding of the heat exchange tubes 23. The larger the pitch, the sparser the spiral winding of the heat exchanger 20 along the axial direction of the inner liner 10; the smaller the pitch, the tighter the winding of the heat exchanger 20 along the axial direction of the inner liner 10. Therefore, the pitch range is limited to ensure that the winding of the heat exchanger 20 along the axial direction of the inner liner 10 has a sufficient tightness. Exemplarily, W / L=0.7, 0.8 or 0.95

[0057] In a further embodiment, in the heat exchanger 20, the distance between any two adjacent heat exchange tubes 23 in the plurality of heat exchange tubes 23 arranged side by side is d. In this way, the tightness of the arrangement of the heat exchange tubes 23 is ensured, which is conducive to arranging more heat exchange tubes 23 together or reducing the length of the first header 21 and the second header 22. When the axial size of the inner tank 10 remains unchanged, it is conducive to spiral winding of longer heat exchange tubes 23, thereby increasing the heat exchange area and improving the heat exchange effect. For example, or

[0058] like Figures 1 to 6 As shown, in a specific embodiment, the heat exchange tube 23 is provided with a fitting section 231 and a transition section 232, the fitting section 231 is attached to the outer peripheral wall of the inner liner 10, the transition section 232 is connected between the fitting section 231 and the first header 21 or the second header 22, and there is a gap between the transition section 232 and the outer peripheral wall of the inner liner 10. Since the diameters of the first header 21 and the second header 22 are larger than the heat exchange tube 23, the setting of the transition section 232 facilitates the connection of the fitting section 231 with the first header 21 or the second header 22. In a further embodiment, the heat exchange tube 23 is configured as a microchannel flat tube, and a small tube diameter is used to achieve sufficient heat exchange between the heat exchange medium in the heat exchange tube 23 and the inner liner 10.

[0059] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A heat pump water heater, characterized in that: The heat pump water heater comprises: An inner liner (10), wherein the outer peripheral wall of the inner liner (10) is provided with a first limiting structure (31) and a second limiting structure (32) which are spaced apart along the axial direction of the inner liner (10); A heat exchanger (20), the heat exchanger (20) comprising a first header (21), a second header (22), and a plurality of heat exchange tubes (23) arranged side by side and spaced apart, the two ends of each heat exchange tube (23) being respectively connected to the first header (21) and the second header (22), and the plurality of heat exchange tubes (23) being spirally wound and attached to the outer peripheral wall of the inner tank (10); The first limiting structure (31) abuts against a side of the first collecting pipe (21) close to the heat exchange tube (23), and the second limiting structure (32) abuts against a side of the second collecting pipe (22) close to the heat exchange tube (23); at least one of the first limiting structure (31) and the second limiting structure (32) can be movably adjusted to a limiting position on the surface of the inner tank (10), and can be fixed relative to the inner tank (10) at the limiting position.

2. The heat pump water heater according to claim 1, characterized in that: At least one of the first limiting structure (31) and the second limiting structure (32) is configured as an elastic member, one end of the elastic member is fixedly connected to the inner container (10), and the other end is a free end.

3. The heat pump water heater according to claim 1 or 2, characterized in that: At least one of the first limiting structure (31) and the second limiting structure (32) is slidably connected to the inner container (10).

4. The heat pump water heater according to claim 3, characterized in that: At least one of the first limiting structure (31) and the second limiting structure (32) is provided with a first sliding groove (301), the inner liner (10) is provided with a matching portion (11), the matching portion (11) extends along the circumference of the inner liner (10), and the matching portion (11) extends into the first sliding groove (301) and is movably connected to the groove wall of the first sliding groove (301); A through hole (302) is provided at the bottom of the first sliding groove (301), and the matching portion (11) is provided with a plurality of positioning holes (111) arranged at intervals; at least one of the first limiting structure (31) and the second limiting structure (32) further comprises a positioning pin (40), and the positioning pin (40) can be passed through the through hole (302) and the positioning hole (111) and connected to the matching portion (11).

5. The heat pump water heater according to claim 3, characterized in that: At least one of the first limiting structure (31) and the second limiting structure (32) is provided with a sliding seat (303) and a limiting rod (304); the sliding seat (303) is connected to the outer peripheral wall of the inner container (10); the sliding seat (303) is provided with a second sliding groove (3031); the side wall of the sliding seat (303) is provided with a through hole (3032) penetrating along the thickness direction thereof; the through hole (3032) extends in the same direction as the extension direction of the second sliding groove (3031); the limiting rod (304) has a sliding end (3041); the sliding end (3041) is protrudingly provided on the rod body of the limiting rod (304); the sliding end (3041) is slidably connected to the groove wall of the second sliding groove (3031) and extends out of the through hole (3032); At least one of the first limiting structure (31) and the second limiting structure (32) further comprises a locking member (50), wherein the locking member (50) is connected to the sliding end (3041) and locks the sliding end (3041).

6. The heat pump water heater according to claim 1, characterized in that: The heat pump water heater further comprises a mounting bracket (24), wherein the mounting bracket (24) is mounted on at least one of the first header (21) and the second header (22), and the mounting bracket (24) is provided with a limiting hole (241), and at least one of the first limiting structure (31) and the second limiting structure (32) is inserted into the corresponding limiting hole (241).

7. The heat pump water heater according to claim 1, characterized in that: The winding angle α of the heat exchange tube (23) is set between 5° and 12°.

8. The heat pump water heater according to claim 1, characterized in that: The pitch of the spiral winding of the plurality of heat exchange tubes (23) arranged side by side is W, the width of the plurality of heat exchange tubes (23) arranged side by side is L, and 0.7≤L / W≤0.

95.

9. The heat pump water heater according to claim 8, characterized in that: The inner container (10) is provided with a liquid inlet (101) and a liquid outlet (102) which are arranged at intervals along the inner container's axial direction; the liquid outlet (102) is higher than the liquid inlet (101); and the first limiting structure (31) and the second limiting structure (32) are arranged away from the liquid inlet (101) and the liquid outlet (102); Along the first direction, the winding spacing of the plurality of heat exchange tubes (23) arranged side by side gradually increases.

10. The heat pump water heater according to any one of claims 8 or 9, characterized in that: In the heat exchanger (20), the distance between any two adjacent heat exchange tubes (23) in the plurality of heat exchange tubes (23) arranged side by side is d.

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