Cascade heat pump capable of switching high-temperature system and low-temperature system

Abstract

A cascade heat pump capable of switching a high-temperature system and a low-temperature system comprises the low-temperature system, the high-temperature system and a switching system, and the switching system comprises an evaporative condenser, a first one-way valve, a second one-way valve, a defrosting electromagnetic valve and a switching electromagnetic valve; a pipeline of the evaporative condenser and a first one-way valve are arranged on a pipeline between the first double-flow-channel heat exchanger and the first liquid storage tank and are connected in parallel with a pipeline of the defrosting electromagnetic valve; the other pipeline of the evaporation condenser and the pipeline of the second one-way valve are respectively communicated with the pipeline between the one-way valve and the second gas-liquid separator and the pipeline between the third throttling device and the first electromagnetic valve; water pipelines of the first double-flow-channel heat exchanger and the second double-flow-channel heat exchanger are connected in series. The low-temperature system is independently used for defrosting, the low-temperature system and the high-temperature system are selected to work simultaneously or independently according to the environment temperature, and the characteristics of high efficiency and energy conservation are achieved.

Description

Technical Field

[0001] The utility model relates to a heat pump hot water device. Background Art

[0002] The current prior art, Chinese Patent 201510262533.1, heat pump, includes: a first circulation device, when heating, the first refrigerant is circulated in sequence through the first compressor, the four-way valve, the first heat exchanger, the second heat exchanger, the first expansion mechanism, the third heat exchanger, the four-way valve and the first compressor, when cooling, the first refrigerant is circulated in sequence through the first compressor, the four-way valve, the third heat exchanger, the first expansion mechanism, the second heat exchanger, the first heat exchanger, the four-way valve and the first compressor; a second circulation device, the second refrigerant is circulated in sequence through the second compressor, the fourth heat exchanger, the second expansion mechanism, the second heat exchanger and the second compressor, one of the first heat exchanger and the second heat exchanger is a first refrigerant-second refrigerant heat exchanger having a first refrigerant flow path through which the first refrigerant passes and a second refrigerant flow path through which the second refrigerant passes and exchanges heat with the first refrigerant. Utility Model Content

[0003] The utility model aims to provide a cascade heat switchable high and low temperature system, which has the characteristics of defrosting and automatically controlling the low and high temperature systems when the ambient temperature changes.

[0004] The utility model is realized in this way: a cascade heat pump capable of switching high and low temperature systems, the special features of which are:

[0005] The cryogenic system includes a first compressor, a four-way valve, a first double-flow heat exchanger, a defrost solenoid valve, a first liquid storage tank, a first throttling device, an economizer, a second throttling device, a first heat exchanger and a first gas-liquid separator;

[0006] The high temperature system includes a second compressor, an oil separator, a second double-flow heat exchanger, a liquid storage tank, a third throttling device, a first solenoid valve, a second heat exchanger, a one-way valve and a second gas-liquid separator;

[0007] A switching system, the switching system comprising an evaporative condenser, a first one-way valve, a second one-way valve, a defrost solenoid valve and a switching solenoid valve;

[0008] A pipeline of the evaporative condenser and a first one-way valve are arranged on the pipeline between the first double-channel heat exchanger and the first liquid storage tank and are connected in parallel with the defrost solenoid valve pipeline. The solenoid valve, another pipeline of the evaporative condenser and the second one-way valve pipeline are respectively connected to the pipeline between the one-way valve and the second gas-liquid separator and the pipeline between the third throttling device and the first solenoid valve; the water pipelines of the first double-channel heat exchanger and the second double-channel heat exchanger are connected in series.

[0009] The cascade heat pump with switchable high and low temperature systems is special in that: during defrosting, the exhaust port of the first compressor, the D port of the four-way valve, the E port of the four-way valve, the first heat exchanger, the second throttling device, the economizer, the first liquid storage tank, the defrost solenoid valve, the first double-flow heat exchanger, the C port of the four-way valve, the S port of the four-way valve, the first gas-liquid separator and the return air port of the first compressor; the high-temperature system is in a closed state, and the second double-flow heat exchanger is in a hot water supply state.

[0010] The cascade heat pump with switchable high and low temperature systems is special in that: in the hot water state in summer, the exhaust port of the second compressor, the oil separator, the second double-flow heat exchanger, the liquid storage tank, the third throttling device, the first solenoid valve, the second heat exchanger, the one-way valve, the second gas-liquid separator and the return air port of the second compressor; the low temperature system is in the closed state, and the second double-flow heat exchanger supplies hot water.

[0011] The cascade heat pump capable of switching high and low temperature systems is special in that: under low ambient temperature conditions, the exhaust port of the first compressor, the D port of the four-way valve, the C port of the four-way valve, the first double-flow heat exchanger, the evaporative condenser, the first non-return valve, and the first liquid storage tank enter the economizer; the economizer is connected to the enthalpy increase air port of the first compressor, and the economizer, the second throttling device, the first heat exchanger, the E port of the four-way valve, and the S port of the four-way valve are connected to the return air port of the first compressor; the bypass first throttling device of the economizer is connected to the pipeline between the economizer and the second throttling device;

[0012] The high temperature system, the exhaust port of the second compressor, the second double-flow heat exchanger, the liquid storage tank, the third throttling device, the switching solenoid valve, the evaporative condenser, the second one-way valve, the second gas-liquid separator and the return air port of the second compressor are connected.

[0013] The utility model discloses a cascade heat pump capable of switching high and low temperature systems. The low temperature system is used solely for defrosting. The low temperature system and the high and low temperature systems can be selected to work simultaneously or the high temperature system can be selected to work alone according to the ambient temperature. The utility model has the characteristics of high efficiency and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a flow chart of the utility model.

[0015] Figure 2 It is a flow chart of the defrosting process of the utility model.

[0016] Figure 3 It is a work flow chart of the high temperature system of the utility model. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] like Figure 1 As shown, a cascade heat pump capable of switching high and low temperature systems comprises

[0020] The cryogenic system comprises a first compressor 1, a four-way valve 3, a first double-flow heat exchanger 2, a defrost solenoid valve 20, a first liquid storage tank 4, a first throttling device 6, an economizer 8, a second throttling device 7, a first heat exchanger 9 and a first gas-liquid separator 10;

[0021] The first compressor 1 is an enthalpy-increasing compressor.

[0022] The high temperature system includes a second compressor 23, an oil separator 22, a second double-flow heat exchanger 12, a liquid storage tank 11, a third throttling device 15, a first solenoid valve 13, a second heat exchanger 17, a one-way valve 19 and a second gas-liquid separator 21;

[0023] The switching system includes an evaporative condenser 5, a first one-way valve 16, a second one-way valve 18, a defrost solenoid valve 20 and a heat-cut solenoid valve 14.

[0024] A pipeline of the evaporative condenser 5 and a first one-way valve 16 are arranged on the pipeline between the first double-channel heat exchanger 2 and the first liquid storage tank 4 and are connected in parallel with the pipeline of the defrost solenoid valve 20; the switching solenoid valve 14, another pipeline of the evaporative condenser 5 and the pipeline of the second one-way valve 18 are respectively connected with the pipeline between the one-way valve 19 and the second gas-liquid separator 21 and the pipeline between the third throttling device 15 and the first solenoid valve 13; the water pipelines of the first double-channel heat exchanger 2 and the second double-channel heat exchanger 12 are connected in series.

[0025] like Figure 2As shown, during defrosting, the exhaust port of the first compressor 1, the D port of the four-way valve 3, the E port of the four-way valve 3, the first heat exchanger 9, the second throttling device 7, the economizer 8, the first liquid storage tank 4, the defrost solenoid valve 20, the first double-flow channel heat exchanger 2, the C port of the four-way valve 3, the S port of the four-way valve 3, the first gas-liquid separator 10 and the return air port of the first compressor 1; the high-temperature system is in a closed state, and the second double-flow channel heat exchanger 12 is in a hot water supply state.

[0026] like Figure 3 As shown, in the summer hot water state, the exhaust port of the second compressor 23, the oil separator 22, the second double-flow channel heat exchanger 12, the liquid storage tank 11, the third throttling device 15, the first solenoid valve 13, the second heat exchanger 17, the one-way valve 19, the second gas-liquid separator 21 and the return air port of the second compressor 23; the low-temperature system is in the closed state, and the second double-flow channel heat exchanger 12 supplies hot water.

[0027] like Figure 1 As shown, under low-temperature ambient conditions, the exhaust port of the first compressor 1, the D port of the four-way valve 3, the C port of the four-way valve 3, the first double-flow heat exchanger 2, the evaporative condenser 5, the first non-return valve 16, and the first liquid storage tank 4 enter the economizer 8; the economizer 8 is connected to the enthalpy-increasing air port of the first compressor 1, and the economizer 8, the second throttling device 7, the first heat exchanger 9, the E port of the four-way valve 3, and the S port of the four-way valve 3 are connected to the return air port of the first compressor 1; the bypass first throttling device 6 of the economizer 8 is connected to the pipeline between the economizer 8 and the second throttling device 7; a pipeline of the evaporative condenser 5 acts as a condenser and releases heat;

[0028] The high temperature system, the exhaust port of the second compressor 23, the oil separator 22, the second double-flow heat exchanger 12, the liquid storage tank 11, the third throttling device 15, the switching solenoid valve 14, the evaporative condenser 5, the second non-return valve 18, the third gas-liquid separator 21 and the return air port of the second compressor 23 are connected. Another pipeline of the evaporative condenser 5 acts as an evaporator and absorbs heat, that is, in the hot water state, the low temperature system provides a heat source for the high temperature system.

[0029] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cascade heat pump with switchable high and low temperature systems, characterized in that: include The cryogenic system includes a first compressor, a four-way valve, a first double-flow heat exchanger, a defrost solenoid valve, a first liquid storage tank, a first throttling device, an economizer, a second throttling device, a first heat exchanger and a first gas-liquid separator; The high temperature system includes a second compressor, an oil separator, a second double-flow heat exchanger, a liquid storage tank, a third throttling device, a first solenoid valve, a second heat exchanger, a one-way valve and a liquid storage tank; A switching system, the switching system comprising an evaporative condenser, a first one-way valve, a second one-way valve, a defrost solenoid valve and a switching solenoid valve; A pipeline of the evaporative condenser and a first one-way valve are arranged on the pipeline between the first double-channel heat exchanger and the first liquid storage tank and are connected in parallel with the defrost solenoid valve pipeline. The solenoid valve, another pipeline of the evaporative condenser and the second one-way valve pipeline are respectively connected to the pipeline between the one-way valve and the second gas-liquid separator and the pipeline between the third throttling device and the first solenoid valve; the water pipelines of the first double-channel heat exchanger and the second double-channel heat exchanger are connected in series.

2. The cascade heat pump with switchable high and low temperature system according to claim 1, characterized in that: During defrosting, the exhaust port of the first compressor, the D port of the four-way valve, the E port of the four-way valve, the first heat exchanger, the second throttling device, the economizer, the first liquid storage tank, the defrost solenoid valve, the first double-flow channel heat exchanger, the C port of the four-way valve, the S port of the four-way valve, the first gas-liquid separator and the return air port of the first compressor; the high-temperature system is in the closed state, and the second double-flow channel heat exchanger is in the hot water supply state.

3. The cascade heat pump with switchable high and low temperature system according to claim 1, characterized in that: In the summer hot water state, the exhaust port of the second compressor, the oil separator, the second double-flow channel heat exchanger, the liquid storage tank, the third throttling device, the first solenoid valve, the second heat exchanger, the one-way valve, the second gas-liquid separator and the return air port of the second compressor; the low-temperature system is in the closed state, and the second double-flow channel heat exchanger supplies hot water.

4. The cascade heat pump with switchable high and low temperature system according to claim 1, characterized in that: Under low-temperature ambient conditions, the exhaust port of the first compressor, the D port of the four-way valve, the C port of the four-way valve, the first double-channel heat exchanger, the evaporative condenser, the first non-return valve, and the first liquid storage tank enter the economizer; the economizer is connected to the enthalpy increase air port of the first compressor, and the economizer, the second throttling device, the first heat exchanger, the E port of the four-way valve, and the S port of the four-way valve are connected to the return air port of the first compressor; the bypass first throttling device of the economizer is connected to the pipeline between the economizer and the second throttling device; The high temperature system, the exhaust port of the second compressor, the oil separator, the second double-flow heat exchanger, the liquid storage tank, the third throttling device, the switching solenoid valve, the evaporative condenser, the second one-way valve, the second gas-liquid separator and the return air port of the second compressor are connected.

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