CN209960795U - Heat storage type heat pump system - Google Patents

Abstract

The utility model relates to the field of heat pumps, and provides a heat storage type heat pump system, which comprises a compressor, an indoor heat exchanger, a throttling device and an outdoor heat exchanger, which are sequentially connected to form a first refrigerant circulation loop. A heat accumulator is arranged on the outer surface, and a second refrigerant circulation pipe is connected to the first refrigerant circulation circuit between the indoor heat exchanger and the outdoor heat exchanger, and the second refrigerant circulation pipe The circuit is connected to the inlet of the regenerator, and the outlet of the regenerator is connected to the inlet of the compressor. The heat storage type heat pump system provided by the utility model fully utilizes the waste heat of the compressor, increases the heating capacity of the system, and strengthens the heating.

Description

Regenerative heat pump system

technical field

The utility model relates to the field of heat pumps, in particular to a heat storage type heat pump system.

Background technique

A heat pump is a device that transfers thermal energy from a low-level heat source to a high-level heat source, and it is also a new energy technology that has attracted much attention. Heat pumps usually first obtain low-grade heat energy from natural air, water or soil, perform work through electricity, and then provide people with high-grade heat energy that can be used.

The types of heat pumps are divided into: air source heat pumps, water source heat pumps, ground source heat pumps, dual source heat pumps (such as water source heat pumps and air source heat pumps) and other types according to different types of heat sources. Among them, the working principle of the air source heat pump is as follows: the evaporator absorbs heat from the ambient air energy to evaporate the heat transfer working medium, the pressure and temperature of the working medium vapor rise after being compressed by the compressor, and the high temperature steam condenses into a heat exchange equipment after heat exchange. liquid, which is returned to the evaporator.

During the use of the heat pump, especially the air source heat pump, when the outdoor ambient temperature is low and the relative humidity is high in winter, the air source heat pump often runs under the frosting condition, and the operation of the heat pump at a lower temperature will affect the operation of the heat pump. Inhalation pressure, air intake temperature, heating capacity decrease, etc. Furthermore, the long-term exposure of the air source heat pump to the cold environment in winter will cause the problem that the heat pump system cannot continue to operate. Strengthening the heating has become an urgent requirement of the low temperature air source heat pump.

Utility model content

(1) Technical problems to be solved

The utility model aims to solve at least one of the technical problems existing in the prior art or related technologies: the operation of the heat pump is affected by the environmental conditions, and in the low temperature and cold environment, the heating capacity of the heat pump will be reduced, and even the heat pump system will be unable to operate The problem.

The purpose of the utility model is to provide a heat storage type heat pump system, which can make full use of the waste heat of the compressor, increase the heating capacity of the system, strengthen the heating, simplify the structure and reduce the cost.

(2) Technical solutions

In order to solve the above technical problems, the present invention provides a heat storage type heat pump system, which includes a compressor, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger that are sequentially connected to form a first refrigerant circulation loop. The compressor There is a heat accumulator on the outer surface of the heat exchanger, and a second refrigerant circulation pipeline is connected to the first refrigerant circulation circuit between the indoor heat exchanger and the outdoor heat exchanger, and the second refrigerant circulates A pipeline is connected to the inlet of the regenerator, and the outlet of the regenerator is connected to the inlet of the compressor.

Preferably, the second refrigerant circulation pipeline is connected between the throttling device and the outdoor heat exchanger; or the throttling device includes a first throttling device and a second throttling device, so The first throttling device is connected between the indoor heat exchanger and the outdoor heat exchanger, and the second refrigerant circulation pipeline is connected between the indoor heat exchanger and the first throttling device. A second throttling device is arranged on the second refrigerant circulation pipeline.

Preferably in any of the above solutions, the throttling device includes an electronic expansion valve, a capillary tube or a capillary core.

In any of the above solutions, preferably, a gas-liquid separator is connected to the outlet of the heat accumulator and the outlet of the outdoor heat exchanger.

In any of the above solutions, preferably, the outlet of the heat accumulator and the outlet of the outdoor heat exchanger are collected into the inlet pipeline of the compressor, and the outlet of the heat accumulator is connected to the outdoor heat exchanger. The outlet of the compressor is connected by piping to the same collection point on the inlet piping of the compressor.

Preferably in any of the above solutions, the gas-liquid separator is connected to the inlet pipeline of the compressor.

Preferably in any of the above solutions, the outlet end of the heat accumulator is provided with a one-way solenoid valve.

Preferably in any of the above solutions, the heat accumulator is set as a phase change heat accumulator.

In any of the above solutions, preferably, the heat accumulator includes a heat storage material and a heat storage coil, the refrigerant in the second refrigerant circulation line is passed into the heat storage coil, and the heat storage coil The heat storage material is filled outside the tube.

Preferably in any of the above solutions, the heat storage material includes a solid-liquid phase change material.

(3) Beneficial effects

Compared with the prior art, the utility model has the following advantages:

Based on the heat dissipation characteristics of the compressor shell, the heat accumulator collects and stores the heat dissipation of the compressor shell, and uses the compressor shell heat dissipation for the refrigerant evaporation process to form two evaporation supplies in the heat pump system. In the heat pipeline, part of the refrigerant absorbs heat and evaporates through the outdoor heat exchanger, and part of the refrigerant absorbs heat and evaporates through the heat accumulator. Two evaporative heating processes are used to evaporate the refrigerant, which not only makes full use of the waste heat of the compressor, The heating capacity of the heat pump system is also increased, thereby improving the heating capacity of the heat pump system, which can be used to solve the problem of insufficient heating capacity under cold and low temperature conditions.

Description of drawings

FIG. 1 is a schematic structural diagram of a preferred embodiment of the regenerative heat pump system of the present invention;

In the figure, 1, compressor; 2, indoor heat exchanger; 3, outdoor heat exchanger; 4, throttling device; 5, heat accumulator; 6, heat storage coil; 7, gas-liquid separator; 8, One-way solenoid valve; 9. Second refrigerant circulation pipeline; 10. First refrigerant circulation pipeline.

Detailed ways

The specific embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

Aiming at the problem that the existing heat pump system is affected by the ambient temperature, the heating capacity is reduced, the utility model proposes a heat storage type heat pump system. Utilize the waste heat of the compressor casing to increase the heating capacity of the entire system.

1, the present invention provides a preferred embodiment of a heat storage heat pump system, including a compressor 1, an indoor heat exchanger 2, a throttling device 4, an outdoor heat exchanger that are sequentially connected to form a first refrigerant circulation loop. Heater 3, the refrigerant is heated and pressurized in the compressor 1 to form high temperature and high pressure gas and enters the indoor heat exchanger 2, the indoor heat exchanger 2 absorbs the heat of the refrigerant to realize the heating function, and the refrigerant is in the indoor heat exchanger. 2. After the heat is released, a high-pressure and low-temperature liquid state is formed. The high-pressure and low-temperature liquid refrigerant is depressurized by the throttling device 4 and then enters the outdoor heat exchanger 3 to evaporate and absorb heat. The outdoor heat exchanger 3 heats the low-temperature and low-pressure liquid refrigerant. After evaporation, a low-pressure superheated gaseous refrigerant is formed, and the refrigerant evaporates in the evaporation cycle to form a low-pressure gas and then enters the compressor 1 again for the next cycle.

In addition, while the refrigerant is supplied with heat through the first refrigerant circulation circuit, a part of the refrigerant supplied by the indoor heat exchanger 2 is depressurized by the throttling device 4 and then enters the heat accumulator 5 and enters the heat accumulator 5. The refrigerant is split through the second refrigerant circulation line 9, and the liquid refrigerant flows into the heat accumulator 5 through the second refrigerant circulation line 9. The heat accumulator 5 is arranged on the outer surface of the compressor 1, and the heat accumulator 5 It is used to absorb the waste heat released by the shell of the compressor 1, and the heat accumulator 5 is used to heat the refrigerant in the second refrigerant circulation pipeline 9. The outlet of the heat accumulator 5 is connected to the inlet end of the compressor 1, and the cooling The agent absorbs heat in the regenerator 5 to form a low-pressure superheated gas, and then enters the compressor 1 again for the next cycle.

Compressor 1, indoor heat exchanger 2, throttling device 4, first refrigerant circulation pipeline 10, and outdoor heat exchanger 3 form a first refrigerant circulation loop; compressor 1, indoor heat exchanger 2, throttling device 4. The second refrigerant circulation pipeline 9 and the heat accumulator 5 form a second refrigerant circulation circuit. The first refrigerant circulation circuit is the main circulation circuit of the refrigerant, and the second refrigerant circulation circuit is the auxiliary circulation circuit of the refrigerant, which fully utilizes the waste heat of the casing of the compressor 1 to increase the heating capacity. The indoor heat exchanger 3 and the heat accumulator 5 cooperate to heat and evaporate the refrigerant. A part of the refrigerant absorbs heat in the heat accumulator 5 to form a low-pressure superheated gas, and a part of the refrigerant absorbs heat in the outdoor heat exchanger 3 to form a low-pressure gas. The superheated gas and the refrigerant in the low pressure superheated gas state enter the compressor 1, and the refrigerant is heated and pressurized in the compressor 1 to perform the next heating process.

The indoor heat exchanger 2 , the outdoor heat exchanger 3 , the compressor 1 , the heat accumulator 5 , and the throttling device 4 are connected by pipes.

In this embodiment, based on the heat storage of the shell of the compressor 1, a heat pump system for enhanced heating with a double evaporation cycle is provided. , the heat recovered by the heat accumulator 5 is used for the evaporation and heat absorption process of a part of the refrigerant, the refrigerant evaporated in the heat accumulator 5 is passed into the compressor 1, and the other refrigerant is evaporated in the outdoor heat exchanger 3 After passing into the compressor 1, the heat accumulator 5 cooperates with the outdoor heat exchanger 3 to heat and evaporate the refrigerant, making full use of the waste heat of the compressor 1, while ensuring the heating capacity of the system and improving the heating capacity.

Further, the position of the throttling device 4 can be set as required. First, the second refrigerant circulation pipeline 9 is connected between the throttling device 4 and the outdoor heat exchanger 3, and when the refrigerant enters the outdoor heat exchanger 3 or The heat accumulator 5 is depressurized before, and then enters the indoor heat exchanger 3 or the heat accumulator 5 for heat exchange respectively after depressurization, which simplifies the structure; secondly, the throttling device 4 includes a first throttling device and a second throttling device , the first throttling device is connected between the indoor heat exchanger 2 and the outdoor heat exchanger 3, the second refrigerant circulation line 9 is connected between the indoor heat exchanger 2 and the first throttling device and the second refrigerant The circulation line 9 is provided with a second throttling device, according to the pressure-bearing capacity of the first refrigerant circulation line 10 and the outdoor heat exchanger 3 and the pressure-bearing capacity of the second refrigerant circulation line 9 and the heat accumulator 5 Depressurization is performed respectively, and the depressurized refrigerant enters the heat accumulator 5 or the outdoor heat exchanger 3 . When the throttling device 4 is arranged between the indoor heat exchanger 2 and the inlet of the second refrigerant circulation line 9, the first refrigerant circulation line 10 and the second refrigerant circulation line 9 are both connected to the throttling device 4 The refrigerant is depressurized through the throttling device 4 to form a low-temperature and low-pressure liquid refrigerant, and then enters the outdoor heat exchanger 3 or the heat accumulator 5, and the low-temperature and low-pressure liquid refrigerant is heated in the outdoor heat exchanger 3 or the heat accumulator 5. After the gaseous refrigerant is formed, it enters the compressor 1 .

When the throttling device 4 is arranged in the first refrigerant circulation pipe 10 and the second refrigerant circulation pipe 9, a second throttling device is connected to the second refrigerant circulation pipe 9, and the first refrigerant circulation pipe 10 is connected with a first throttling device, the refrigerant depressurized by the first throttling device directly enters the outdoor heat exchanger 3, and the refrigerant depressurized by the second throttling device enters the heat accumulator 5, and a part of it is refrigerated The refrigerant absorbs heat in the heat accumulator 5 to form a low-pressure superheated gas, and a part of the refrigerant absorbs heat in the outdoor heat exchanger 3 to form a low-pressure superheated gas. Heating and pressurizing are carried out inside, and the next heating process is carried out.

Further, a gas-liquid separator 7 is connected to the refrigerant outlet of the heat accumulator 5 and the refrigerant outlet of the outdoor heat exchanger 3 . The refrigerant heated by the heat accumulator 5 or the outdoor heat exchanger 3 may carry refrigerant droplets. The gas-liquid separator 7 is used to separate the gaseous and liquid refrigerants to ensure that the refrigerant enters the compressor 1 in a gaseous state. Compressor 1 is protected.

Among them, the gas-liquid separator 7 can be set at the refrigerant outlet position of the heat accumulator 5 and the refrigerant outlet position of the outdoor heat exchanger 3 respectively, and the refrigerant heated by the heat accumulator 5 and the refrigerant heated by the outdoor heat exchanger 3 The refrigerant is collected and passed into the compressor 1 after the droplets are removed.

In addition, the gas-liquid separator 7 can also be installed at the inlet of the compressor 1, and the refrigerant heated by the heat accumulator 5 and the refrigerant heated by the outdoor heat exchanger 3 are collected first and then enter the gas-liquid separator 7 for removal. droplets, and then the gas-liquid separator 7 passes the gaseous refrigerant into the compressor 1 .

Further, the inlet position of the compressor 1 is connected with an inlet pipeline, and the refrigerant flowing out of the refrigerant outlet of the heat accumulator 5 and the refrigerant flowing out of the refrigerant outlet of the outdoor heat exchanger 3 are on the inlet pipeline of the compressor 1. pool for access to compressor 1.

The refrigerant can be separated from gas and liquid before entering the inlet pipeline, and can also be separated into gas and liquid after being mixed in the inlet pipeline.

Preferably, the refrigerant outlet of the heat accumulator 5 and the refrigerant outlet of the outdoor heat exchanger 3 are both connected to the same collection point of the inlet pipeline of the compressor 1, that is, the refrigerant flowing out of the heat accumulator 5 and the outdoor heat exchanger 3 The outflowing refrigerant flows into the inlet pipeline at the same collection point, and the gas-liquid separator 7 is connected to the inlet pipeline of the compressor 1. After mixing in the inlet pipeline, it enters the gas-liquid separator 7, and after gas-liquid separation, into compressor 1.

Further, the refrigerant outlet end of the heat accumulator 5 is provided with a one-way solenoid valve 8 to prevent the refrigerant from flowing backward and ensure the stable circulation of the refrigerant.

Preferably, the heat accumulator 5 is set as a phase change heat accumulator, using a phase change heat storage material, and the heat storage material changes the state of the material by absorbing heat to store latent heat. Phase change heat storage can be divided into solid-liquid phase change, liquid-gas phase change and solid-gas phase change. Different heat storage materials are selected according to the system scale and heating demand. Preferably, the heat storage material includes a solid-liquid phase change material, which is suitable for a low-temperature phase change heat storage process, and the heat storage material can be selected from paraffin, expanded graphite, and the like.

The heat accumulator 5 is fitted on the outer surface of the compressor 1 . The heat accumulator 5 surrounds the casing of the compressor 1 to form a hollow structure. A cavity is formed in the heat accumulator 5 for absorbing and utilizing the waste heat of the compressor 1 .

The heat accumulator 5 includes a heat storage material and a heat storage coil 6, the refrigerant in the second refrigerant circulation line 9 is passed into the heat storage coil 6, and the heat storage coil 6 is filled with heat storage material. The heat storage material is filled in the cavity of the heat accumulator 5, the heat storage coil 6 is placed in the heat storage material, the heat storage material fully absorbs the waste heat of the compressor 1, and the heat storage material transfers the heat to the heat storage coil 6 refrigerant.

The solid-liquid phase change heat storage material is used to absorb the shell heat dissipated when the compressor 1 operates, and the heat storage material gradually changes from solid to liquid to store its waste heat. When the device is in heating operation, the refrigerant Flowing through the heat storage coil 6 in the heat accumulator 5, the refrigerant absorbs the latent heat of the phase change of the heat storage material, and the heat storage material gradually changes from a liquid state to a solid state.

The heat storage coil 6 is formed into a spiral structure, and the heat storage coil 6 is annularly wound around the casing of the compressor 1 .

Furthermore, the heat accumulator 5 may also be provided with an electric heating component. When the waste heat of the compressor 1 is not enough to supply the refrigerant heat demand, the electric heating is used for assistance to ensure the stable operation of the first evaporation cycle. The electric heating component is preferably a heating coil embedded in the heat storage coil 6 to rapidly heat the refrigerant, and at the same time, the heat storage material can absorb the heat dissipation of the heating coil for supplementary heating. Preferably, the heating coil is arranged inside the heat storage coil 6 .

The throttling device 4 includes an electronic expansion valve, a capillary tube or a capillary core, etc., and any throttling structure suitable for refrigerant pressure reduction is applicable.

Specific working process:

The heat accumulator 5 is fitted on the outer surface of the compressor 1. The heat accumulator 5 is filled with a solid-liquid phase transition heat storage material. The heat storage coil 6 in the heat accumulator 5 is coiled in the heat storage material. By absorbing the heat dissipated when the compressor 1 is running, the heat storage material is gradually transformed from a solid state to a liquid state to store the shell heat of the compressor 1 .

When the heat pump is in heating operation, the high-temperature and high-pressure refrigerant from the compressor 1 flows through the indoor heat exchanger 2 and the throttling device 4, and then splits from point a, and part of the refrigerant directly flows through the outdoor heat exchanger 3, while the other A part of the refrigerant flows through the heat storage coil 6 in the heat accumulator 5 for evaporation and heat absorption. At this time, the heat storage material gradually changes from liquid to solid, and the last two parts of the refrigerant converge at point b and enter through the gas-liquid separator 7. Compressor 1 performs the next cycle.

In the heat pump system of the above embodiment, the waste heat of the casing of the compressor 1 is recovered and utilized, and the waste heat is used in the heating process of the heat pump system, thereby improving the heating capacity of the heat pump system.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "horizontal", "upper", "lower", "front", "rear", "left", "right", The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplified description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific conditions.

In addition, in the description of the present invention, unless otherwise specified, "plurality", "plurality" and "multiple groups" mean two or more.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the within the scope of protection of the present invention.

Claims (10)

1. The heat storage type heat pump system is characterized by comprising a compressor, an indoor heat exchanger, a throttling device and an outdoor heat exchanger which are sequentially connected to form a first refrigerant circulation loop, wherein a heat accumulator is arranged on the outer surface of the compressor, a second refrigerant circulation pipeline is connected to the first refrigerant circulation loop between the indoor heat exchanger and the outdoor heat exchanger, the second refrigerant circulation pipeline is connected to an inlet of the heat accumulator, and an outlet of the heat accumulator is connected with an inlet end of the compressor.

2. The heat storage type heat pump system according to claim 1, wherein the second refrigerant circulation line is connected between the throttling device and the outdoor heat exchanger; or the throttling device comprises a first throttling device and a second throttling device, the first throttling device is connected between the indoor heat exchanger and the outdoor heat exchanger, the second refrigerant circulating pipeline is connected between the indoor heat exchanger and the first throttling device, and the second throttling device is arranged on the second refrigerant circulating pipeline.

3. The heat storage heat pump system of claim 1, wherein the throttling device comprises an electronic expansion valve, a capillary tube, or a capillary wick.

4. The heat storage type heat pump system according to any one of claims 1 to 3, wherein a gas-liquid separator is connected to an outlet of the heat accumulator and an outlet of the outdoor heat exchanger.

5. The heat storage type heat pump system according to claim 4, wherein the outlet of the heat accumulator and the outlet of the outdoor heat exchanger converge on an inlet line of the compressor, and the outlet of the heat accumulator and the outlet of the outdoor heat exchanger are connected to the same convergence point on the inlet line of the compressor through a pipe.

6. The regenerative heat pump system according to claim 5, wherein the gas-liquid separator is connected to an inlet line of the compressor.

7. The heat storage type heat pump system according to claim 1, wherein an outlet end of the heat accumulator is provided with a one-way solenoid valve.

8. The heat storage type heat pump system according to claim 1, wherein the heat accumulator is provided as a phase change heat accumulator.

9. The heat storage type heat pump system according to claim 8, wherein the heat storage apparatus includes a heat storage material and a heat storage coil, the refrigerant of the second refrigerant circulation line passes into the heat storage coil, and the heat storage coil is externally filled with the heat storage material.

10. The regenerative heat pump system according to claim 9, wherein the thermal storage material comprises a solid-liquid phase change material.

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