Water tank and heat pump water heater

Abstract

The present invention belongs to the technical field of water heaters and discloses a water tank comprising an inner tank, an outer coil heat exchanger wrapped around the outer wall of the inner tank, and a spiral water inlet pipe attached to the inner wall of the inner tank. Water entering the water tank is introduced into the inner tank after passing through the spiral water inlet pipe. The present invention attaches and installs the spiral water inlet pipe on the inner wall of the inner tank. When water enters the water tank through the inlet of the spiral water inlet pipe, it undergoes forced convection heat exchange with the outer coil heat exchanger under the action of the water supply pressure, thereby improving the heat transfer coefficient and heat transfer efficiency. In addition, the cold water entering the spiral water inlet pipe directly exchanges heat with the outer coil heat exchanger. The temperature of the refrigerant medium in the outer coil heat exchanger does not need to be too high to meet the heat exchange requirements, effectively reducing energy consumption, improving heat exchange performance, and alleviating the burden on the heat pump water heater compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and in particular to a water tank and a heat pump water heater. Background Art

[0002] At present, nearly 90% of the household air source heat pump water heaters on the market are static heating air source heat pump water heaters, and the mainstream structure is that the heat exchanger 100 is wrapped outside the water tank liner 101 and separated from the water to prevent corrosion and scaling of the heat exchanger 100 (see Figure 1 ), the water tank is equipped with a cold water inlet pipe 102 at the lower end and a hot water outlet pipe 103 at the upper end. During the hot water production process, cold water enters the inner tank 101 through the cold water inlet pipe 102. The heated water side exchanges heat with the heat exchanger 100 wrapped around the outer shell 101 by natural convection, gradually bringing the water temperature to the user's set temperature. Because the water side of the water tank exchanges heat by natural convection, when the water temperature in the inner tank 101 is high, the refrigerant temperature in the heat exchanger 100 needs to be even higher to achieve heat exchange. This results in excessive energy consumption, poor heat exchange performance, and low hot water production efficiency. Summary of the Invention

[0003] The object of the present invention is to provide a water tank and a heat pump water heater to solve the problems of poor heat exchange performance and low hot water production efficiency of the water tank of the existing heat pump water heater.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A water tank comprises an inner tank, an outer coil heat exchanger wrapped around the outer wall of the inner tank, a spiral water inlet pipe attached to the inner wall of the inner tank, and water entering the water tank is introduced into the inner tank after passing through the spiral water inlet pipe.

[0006] Preferably, the direction of water flow in the spiral water inlet pipe is opposite to the direction of medium flow in the external coil heat exchanger.

[0007] Preferably, the water in the water tank is introduced into the bottom of the inner tank through the spiral water inlet pipe.

[0008] Preferably, a plurality of the spiral water inlet pipes are provided, and adjacent spiral water inlet pipes are arranged at equal intervals.

[0009] Preferably, the pitch of the spiral water inlet pipe is 1 / 8-1 / 6 of the height of the inner tank.

[0010] Preferably, a hot water outlet pipe is provided at the top of the inner tank.

[0011] Preferably, one side wall of the spiral water inlet pipe is a planar structure, and the planar structure is attached to the inner wall of the inner tank.

[0012] Preferably, the planar structure is welded to the inner wall of the liner.

[0013] Preferably, the cross-sectional shape of the spiral water inlet pipe is D-shaped, rectangular or polygonal.

[0014] The present invention also provides a heat pump water heater, comprising the above-mentioned water tank.

[0015] Beneficial effects of the present invention:

[0016] By attaching and installing a spiral water inlet pipe on the inner wall of the water tank's liner, when water enters the water tank through the inlet of the spiral water inlet pipe, it will undergo forced convection heat exchange with the external coil heat exchanger under the action of the water supply pressure, thereby improving the heat transfer coefficient and heat transfer efficiency.

[0017] Moreover, the cold water entering the spiral water inlet pipe directly exchanges heat with the external coil heat exchanger. The temperature of the refrigerant medium in the external coil heat exchanger does not need to be too high to meet the heat exchange requirements, which effectively reduces energy consumption, improves heat exchange performance, and reduces the burden on the heat pump water heater compressor.

[0018] When the water in the spiral water inlet pipe is converted into medium-temperature water after heat exchange and flows out, the impact on the water temperature stratification of the water tank can be reduced; and the water in the water tank is introduced into the bottom of the inner tank after passing through the spiral water inlet pipe, which can avoid the medium-temperature water after heat exchange disturbing the high-temperature hot water stratification in the upper layer of the inner tank, thereby increasing the hot water output of the water tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of a water tank in the prior art;

[0020] Figure 2 It is a structural schematic diagram of the water tank of the present invention;

[0021] Figure 3 It is a schematic structural diagram of the water tank according to the present invention, not showing the external coil heat exchanger;

[0022] Figure 4 It is a cross-sectional view of the spiral water inlet pipe of the present invention.

[0023] In the picture:

[0024] 1. Inner tank; 2. External coil heat exchanger; 3. Spiral water inlet pipe; 4. Cold water inlet pipe; 5. Hot water outlet pipe; 31. Planar structure; 100. Heat exchanger; 101. Inner tank; 102. Cold water inlet pipe; 103. Hot water outlet pipe. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0026] The present invention provides a water tank, such as Figure 2 and Figure 3 As shown, the water tank includes an inner tank 1, an outer coil heat exchanger 2 is wrapped around the outer wall of the inner tank 1, and a spiral water inlet pipe 3 with a spiral structure is provided inside the inner tank 1. The spiral water inlet pipe 3 is attached to the inner wall of the inner tank 1.

[0027] In this embodiment, the water in the water tank is introduced into the bottom of the inner tank 1 through the spiral water inlet pipe 3. Specifically, the inlet of the spiral water inlet pipe 3 is located at the upper end of the inner tank 1, and the outlet is located at the bottom of the inner tank 1.

[0028] A hot water outlet pipe 5 is provided at the top of the inner tank 1 for the outflow of hot water. A cold water inlet pipe 4 is provided below the hot water outlet pipe 5 and is connected to the inlet of the spiral water inlet pipe 3 for the entry of cold water.

[0029] In this embodiment, when water enters the water tank through the spiral inlet pipe 3, it undergoes forced convection heat exchange with the external coil heat exchanger 2 under the action of the water supply pressure, thereby improving the heat transfer coefficient and heat exchange efficiency. Furthermore, the cold water entering the spiral inlet pipe 3 directly exchanges heat with the external coil heat exchanger 2, so the refrigerant medium temperature in the external coil heat exchanger 2 does not need to be too high to meet the heat exchange requirements, effectively reducing energy consumption and improving heat exchange performance.

[0030] In addition, when the water in the spiral water inlet pipe 3 of this embodiment is converted into medium-temperature water through heat exchange and flows out, the impact on the water temperature stratification of the water tank can be reduced; and the inlet of the spiral water inlet pipe 3 is set at the upper end and the outlet is set at the lower end, which can avoid the medium-temperature water after heat exchange disturbing the stratification of the upper layer of high-temperature hot water in the inner tank 1, thereby increasing the hot water output of the water tank.

[0031] In this embodiment, refer to Figure 4 The spiral water inlet pipe 3 has a flat surface structure 31 on one side of the pipe wall. This flat surface structure 31 is attached to the inner wall of the inner liner 1 and is specifically welded integrally to the inner wall of the inner liner 1. The arrangement of this flat surface structure 31 increases the contact area between the spiral water inlet pipe 3 and the inner liner 1, thereby increasing the heat transfer coefficient between the spiral water inlet pipe 3 and the external coil heat exchanger 2 and improving the heat transfer efficiency. Figure 4 As shown, the cross-sectional shape of the spiral water inlet pipe 3 of this embodiment is D-shaped. Of course, the cross-sectional shape of the spiral water inlet pipe 3 is not limited to the D-shape, and can also be other shapes such as a rectangle or a polygon.

[0032] In this embodiment, the pitch of the spiral water inlet pipe 3 is 1 / 8-1 / 6 of the height of the inner tank 1. By setting this pitch, the heat exchange efficiency and water outlet temperature of the spiral water inlet pipe 3 can be optimized.

[0033] In this embodiment, a single spiral water inlet pipe 3 can be provided. In this case, heat exchange with the external coil heat exchanger 2 occurs through only one spiral water inlet pipe 3, thereby increasing the temperature of the water entering the water tank. Alternatively, multiple spiral water inlet pipes 3 can be provided, with adjacent spiral water inlet pipes 3 spaced evenly apart. By providing multiple spiral water inlet pipes 3, the efficiency of hot water production can be improved.

[0034] In this embodiment, the external coil heat exchanger 2 may be an aluminum external coil heat exchanger, a copper external coil heat exchanger or a microchannel heat exchanger.

[0035] The above-mentioned water tank in this embodiment has the advantages of being corrosion-free and scaling-free like an external coil water exchange water tank. At the same time, it forms forced convection power on the water side through the water replenishment pressure, thereby improving the heat exchange performance between the refrigerant and water. Moreover, there is no need to add a power device, which greatly improves the heat exchange efficiency of the entire machine.

[0036] The present invention also provides a heat pump water heater, comprising the above-mentioned water tank, through which forced convection heat exchange can be performed with the external coil heat exchanger 2 under the action of water supply pressure, thereby improving the heat exchange coefficient and heat exchange efficiency.

[0037] Specifically, the heat pump water heater in this embodiment is a static heating air source heat pump water heater.

[0038] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A water tank for a heat pump water heater, comprising an inner tank (1), an outer coil heat exchanger (2) wrapped around the outer wall of the inner tank (1), characterized in that: A spiral water inlet pipe (3) is attached to the inner wall of the inner container (1), and water from the water tank is introduced into the inner container (1) through the spiral water inlet pipe (3); The inlet of the spiral water inlet pipe (3) is located at the upper end of the inner liner (1), and the outlet is located at the bottom of the inner liner (1), so as to improve the heat transfer coefficient and heat transfer efficiency and prevent the medium-temperature water after heat exchange from disturbing the stratification of the upper layer of high-temperature hot water in the inner liner (1); one side wall of the spiral water inlet pipe (3) is a plane structure (31), and the plane structure (31) is attached to the inner wall of the inner liner (1); The direction of water flow in the spiral water inlet pipe (3) is opposite to the direction of medium flow in the external coil heat exchanger (2).

2. The water tank according to claim 1, characterized in that The water in the water tank is introduced into the bottom of the inner tank (1) through the spiral water inlet pipe (3).

3. The water tank according to claim 1, characterized in that A plurality of the spiral water inlet pipes (3) are provided, and adjacent spiral water inlet pipes (3) are arranged at equal intervals.

4. The water tank according to claim 1, characterized in that The pitch of the spiral water inlet pipe (3) is 1 / 8-1 / 6 of the height of the inner container (1).

5. The water tank according to claim 1, characterized in that A hot water outlet pipe (5) is provided at the top of the inner container (1).

6. The water tank according to claim 1, characterized in that The planar structure (31) is welded to the inner wall of the inner container (1).

7. The water tank according to claim 1, characterized in that The cross-sectional shape of the spiral water inlet pipe (3) is D-shaped, rectangular or polygonal.

8. A heat pump water heater, characterized in that: The water tank comprises the water tank described in any one of claims 1 to 7.

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