Small-volume heat pump water heater capable of reducing hot water fluctuation

Abstract

A small-volume heat pump water heater capable of reducing hot water fluctuation comprises a water side heat exchanger of a heat pump main machine, a three-way reversing valve, a water storage tank, a water tank temperature probe, a one-way valve, a circulating water pump and a three-way pipe fitting. The water outlet end of the water heat exchanger, the A-B end of the three-way reversing valve, the circulating inlet, the circulating outlet, the one-way valve, the circulating water pump, the three-way pipe fitting and the water inlet end of the water heat exchanger form a circulating heating and hot water supplementing path. When hot water is discharged from the water storage tank, cold water firstly enters the bottom of the water storage tank, and when the water temperature in the middle of the water storage tank is reduced to the set temperature, the heat pump unit is started, high-temperature hot water is conveyed to the middle of the hot water storage tank through a circulating outlet via the three-way reversing valve, the hot water outlet temperature is maintained, and fluctuation of the hot water temperature is reduced.

Description

Technical Field

[0001] This utility model relates to a heat pump water heater. Background Technology

[0002] The existing technology, Chinese patent 201120357269.7, describes a storage-type air source heat pump water heater, including a water storage tank, an air source heat pump main unit, a condenser heat exchange coil, and an auxiliary heating coil. The air source heat pump main unit includes a compressor, a four-way valve, a throttling device, an air evaporator, and a refrigerant connection pipe. The condenser heat exchange coil is located in the water storage tank and connected to the refrigerant connection pipe of the air source heat pump main unit to form a circulation loop. The auxiliary heating coil is located in the water storage tank, and its inlet and outlet ends are connected to the hot water source. The problem is that the temperature of the hot water coming out of the storage tank fluctuates. Utility Model Content

[0003] The purpose of this invention is to provide a small-capacity heat pump water heater that reduces hot water fluctuations. It features a small storage tank volume, constant output hot water temperature, and a large continuous output of hot water.

[0004] This utility model is implemented as follows: a small-capacity heat pump water heater that reduces hot water fluctuations, characterized by including a condenser of the heat pump main unit, a three-way reversing valve, a water storage tank, a water tank temperature probe, a one-way valve, a circulating water pump, and a three-way pipe fitting.

[0005] The water storage tank includes a hot water outlet pipe at the top, an inlet and a circulation outlet at the bottom, and a circulation inlet in the middle.

[0006] The outlet of the water-side heat exchanger is connected to end A of the three-way reversing valve, end B of the three-way reversing valve is connected to the circulation inlet, and end C of the three-way reversing valve is connected to the water inlet; the water source, the straight pipe of the three-way fitting is connected to the water inlet of the water heat exchanger, and the circulation outlet, the check valve, the circulating water pump and the three-way fitting are connected; the water tank temperature probe is located in the lower middle part of the longitudinal direction of the water storage tank;

[0007] The outlet of the water heat exchanger, the A and B ends of the three-way reversing valve, the circulation inlet, the circulation outlet, the check valve, the circulating water pump, the three-way pipe fittings, and the inlet of the water heat exchanger constitute the circulation heating and hot water replenishment circuit.

[0008] The small-capacity heat pump water heater that reduces hot water fluctuations is characterized by the following: the water heat exchanger is equipped with an inlet water temperature probe at the inlet end and an outlet water temperature probe at the outlet end.

[0009] This utility model relates to a small-capacity heat pump water heater that reduces hot water fluctuations. When hot water is dispensed from the storage tank, cold water first enters the bottom of the storage tank. When the water temperature in the middle drops to the set temperature, the heat pump unit is activated. The high-temperature water is then sent to the middle of the hot water storage tank through the circulation outlet via a three-way reversing valve, maintaining the hot water outlet temperature and reducing hot water temperature fluctuations. Attached Figure Description

[0010] Figure 1 This is the front view of this utility model. Detailed Implementation

[0011] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0012] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0013] like Figure 1 As shown, a heat pump water heater that reduces hot water fluctuations includes a water-side heat exchanger 1 of the heat pump main unit, a three-way reversing valve 2, a water storage tank 3, a water tank temperature probe 4, a one-way valve 5, a circulating water pump 6, and a three-way pipe fitting 7.

[0014] The water-side heat exchanger 1 includes a condenser and a water heat exchanger that are connected to the heat pump main unit.

[0015] The water storage tank 3 includes a hot water outlet pipe 31 at the top, a water inlet 32 ​​and a circulation outlet 33 at the bottom, and a circulation inlet 34 in the middle.

[0016] The outlet of the water heat exchanger 1 is connected to the A end of the three-way reversing valve 2, the B end of the three-way reversing valve 2 is connected to the circulation inlet 34, and the C end of the three-way reversing valve 2 is connected to the inlet 32; the straight pipe of the water source and the three-way fitting 7 is connected to the inlet of the water heat exchanger, and the circulation outlet 33, the one-way valve 5, the circulating water pump 6 and the branch pipe of the three-way fitting 7 are connected; the water tank temperature probe 4 is located in the lower middle part of the longitudinal direction of the water storage tank 3;

[0017] The outlet of the water heat exchanger, the A and B ends of the three-way reversing valve 2, the circulation inlet 34, the circulation outlet 33, the one-way valve 5, the circulating water pump 6, the three-way pipe fitting 7, and the inlet of the water heat exchanger constitute the circulation heating and hot water replenishment circuit.

[0018] The water heat exchanger is equipped with an inlet water temperature probe 8 at the inlet end and an outlet water temperature probe 9 at the outlet end.

[0019] When the power is first turned on (the hot water storage tank is full of cold water), the temperature of the water tank temperature probe 4 is low. At this time, the circulating water pump 6 and the heat pump unit are immediately turned on. Then, the outlet of the water heat exchanger will discharge high-temperature hot water. The high-temperature hot water enters the A end of the three-way reversing valve and is discharged through the B end of the three-way reversing valve into the circulation inlet 34, circulation outlet 33, one-way valve 5, circulating water pump 6, three-way fitting 7 and the inlet of the water heat exchanger; then the water in the hot water storage tank is gradually heated.

[0020] In the initial stage of user water use (before the heat pump unit is turned on), cold water enters the hot water storage tank 3 through the water heat exchanger, end A of the three-way reversing valve, end C of the three-way reversing valve, and inlet 32 ​​to replenish water, while hot water moves upward.

[0021] As users continuously use water, cold water gradually diffuses from the bottom of the hot water storage tank towards the middle. When the temperature of the water tank temperature probe 4 drops below a certain value, the circulating water pump 6 and the heat pump unit are immediately activated. Subsequently, the water heat exchanger discharges high-temperature hot water. When the outlet water temperature probe 9 detects high-temperature water, the A end and B end of the three-way reversing valve are connected, and the high-temperature water circulation inlet enters the hot water storage tank, that is, high-temperature water is replenished to the middle of the hot water storage tank. Since the unit has a large heating power (i.e., the heat discharged by the user is less than the heat produced by the unit), the cold water in the lower part of the water tank is gradually heated over time. This process reduces the water temperature fluctuation at the user's outlet.

[0022] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A small-capacity heat pump water heater that reduces hot water fluctuations, characterized in that: This includes the water-side heat exchanger of the heat pump unit, a three-way reversing valve, a water storage tank, a water tank temperature probe, a check valve, a circulating water pump, and three-way pipe fittings. The water storage tank includes a hot water outlet pipe at the top, an inlet and a circulation outlet at the bottom, and a circulation inlet in the middle. The outlet of the water-side heat exchanger is connected to end A of the three-way reversing valve, end B of the three-way reversing valve is connected to the circulation inlet, and end C of the three-way reversing valve is connected to the water inlet; the water source, the straight pipe of the three-way fitting is connected to the water inlet of the water heat exchanger, and the circulation outlet, the check valve, the circulating water pump, and the branch pipe of the three-way fitting are connected; the water tank temperature probe is located in the middle of the longitudinal direction of the water storage tank; The outlet of the water heat exchanger, the A and B ends of the three-way reversing valve, the circulation inlet, the circulation outlet, the check valve, the circulating water pump, the three-way pipe fittings, and the inlet of the water heat exchanger constitute the circulation heating and hot water replenishment circuit.

2. A small-capacity heat pump water heater for reducing hot water fluctuations according to claim 1, characterized in that: The water heat exchanger is equipped with an inlet water temperature probe at the inlet end and an outlet water temperature probe at the outlet end.

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