Heat pump water chilling unit system

Abstract

The utility model relates to the technical field of heat pump refrigerating systems, in particular to a heat pump water chilling unit system which comprises a compressor, a condenser, an evaporator and an environment temperature sensor. An inlet of the heat exchange coil pipe is connected with an outlet of the condenser through a liquid outlet pipeline, and is connected with an air return port of the compressor through an air return pipeline; an exhaust temperature sensor and a high-voltage switch are sequentially arranged on the exhaust pipeline in the exhaust direction, an anti-freezing temperature sensor is arranged at an inlet of the heat exchange coil, and a low-voltage switch, a return gas temperature sensor and a gas-liquid separator are sequentially arranged on the return gas pipeline in the return gas direction. In the environment of high air temperature of countries or regions with tropical and tropical climates, a refrigerant flows from the compressor to the condenser, passes through the electronic expansion valve, then is subjected to heat exchange through the evaporator and finally returns to the compressor, heat exchange is circulated in this way, and only a single refrigeration mode is carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump refrigeration systems, in particular to a heat pump chiller system. Background Art

[0002] Air source heat pump is an efficient and energy-saving device that makes full use of low-grade thermal energy. It uses the reverse Carnot cycle principle to convert the heat energy in the air into heat energy that can supply indoor heating and cooling needs by absorbing, compressing, expanding and releasing gas. Today, there is a big difference between the north and the south of the domestic heat pump market: the demand for heating heat pumps in the north is greater than that in the south, and the scale of the heat pump hot water market in the south is larger than that in the north. Obviously, this is caused by the different temperature characteristics between the north and the south. From the micro to the macro, the world is now facing an energy crisis, and people around the world are paying more and more attention to the environment, and the demand for heat pumps has ushered in a blowout growth. Although heat pumps for heating and hot water have been involved in most countries in the world, for some countries or regions with tropical climates, these two types of heat pumps cannot bring substantial improvement to their quality of life. For countries or regions with tropical climates, the temperature remains high throughout the year, and cooling throughout the year becomes their main or even only demand. The temperature in countries or regions with tropical climates is high, and the heat exchange mode and defrosting mode consume energy, which has a reverse suppression of the demand for cooling and cannot meet the continuous demand for cooling. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a heat pump chiller system that only performs single refrigeration, automatically controls the heat exchange of the evaporator, and reduces the indoor temperature. It adopts temperature sensor feedback to prevent the water temperature from freezing the pipeline due to low temperature, so as to keep the indoor environment in a more comfortable state.

[0004] The technical problem to be solved by the utility model is achieved through the following technical solutions: a heat pump chiller system, including a compressor, a condenser, an evaporator and an ambient temperature sensor, the air outlet of the compressor is connected to the inlet of the condenser through an exhaust pipeline, a heat exchange coil is arranged in the evaporator, the inlet of the heat exchange coil is connected to the outlet of the condenser through a liquid outlet pipeline, and the inlet of the heat exchange coil is connected to the return air port of the compressor through an air return pipeline;

[0005] An exhaust temperature sensor and a high-pressure switch are arranged in sequence along the exhaust direction of the exhaust pipeline, an antifreeze temperature sensor is arranged at the inlet of the heat exchange coil, and a low-pressure switch, a return air temperature sensor and a gas-liquid separator are arranged in sequence along the return air pipeline in the return direction.

[0006] As a further solution of the utility model, the liquid outlet pipeline is provided with a filter and an electronic expansion valve in sequence along the liquid outlet direction.

[0007] As a further solution of the utility model, the evaporator is also provided with a water inlet and a water outlet, the water inlet is connected to a water inlet pipeline, the water inlet pipeline is provided with a water inlet temperature sensor, and the water outlet is connected to a water outlet pipeline, the water outlet pipeline is provided with a water outlet temperature sensor.

[0008] As a further solution of the utility model, the system also includes a main control board, which is provided with a main controller, a high-power supply module and a switching power supply transformer module. The high-power supply module receives AC power, and the high-power supply module is electrically connected to the COM terminal of the compressor relay and is also electrically connected to the main controller.

[0009] As a further solution of the utility model, the switching power supply transformer module rectifies, filters and transforms the 220V AC power into 12V and 5V DC power. The switching power supply transformer module is electrically connected to the electronic expansion valve, ambient temperature sensor, exhaust temperature sensor, return air temperature sensor, water inlet temperature sensor and water outlet temperature sensor.

[0010] As a further solution of the utility model, the main controller is communicatively connected with the electronic expansion valve, the ambient temperature sensor, the exhaust temperature sensor, the return air temperature sensor, the water inlet temperature sensor and the water outlet temperature sensor.

[0011] As a further solution of the utility model, the compressor is a special compressor for refrigeration, and the compressor is communicatively connected with the main controller.

[0012] As a further solution of the utility model, a circulation pipe is provided between the water inlet and the water outlet of the evaporator, and a return water pump and a water flow switch are provided on the circulation pipe. The return water pump and the water flow switch are both connected to the main controller in communication, and circulating water is provided in the circulation pipe. The return water pump ensures sufficient water flow, and the inlet water temperature sensor and the ambient temperature sensor are used to prevent the water temperature from freezing the pipeline due to being too low, so as to maintain a more comfortable indoor environment. The water flow switch prevents the system water flow from being too small, causing the pipeline to freeze or a high pressure alarm, so that the system can operate more stably.

[0013] As a further solution of the utility model, the system includes a one-way refrigeration mode and an antifreeze mode;

[0014] The system starts the one-way refrigeration mode. The compressor compresses the refrigerant to increase the temperature, enters the condenser for heat exchange and condenses into medium-temperature and high-pressure gas, and then throttles through the electronic expansion valve to obtain a low-temperature and low-pressure gas-liquid mixture, which enters the evaporator and becomes a low-temperature and low-pressure gas. The circulating water exchanges heat with the refrigerant in the evaporator to perform one-way refrigeration. In countries or regions with tropical climates, the temperature is high, and there is no need for heating and defrosting modes. Only single refrigeration is performed to save energy and adapt to environmental settings.

[0015] As a further solution of the utility model, in the antifreeze mode, the ambient temperature sensor measures the ambient temperature. When the ambient temperature sensor measures the ambient temperature ≤ 2°C, and the return water pump is turned off for more than 30 minutes, the return water pump is forced to start for 60 seconds. When the ambient temperature is ≥ 4°C, the antifreeze mode is exited;

[0016] When the ambient temperature sensor fails, the return water pump will be started periodically and run for 60 seconds every 30 minutes. When the unit is in standby or shutdown state and the inlet water temperature is ≤5℃, the unit will automatically start heating. When the evaporator inlet water temperature is ≥15℃, the unit will stop heating and exit the antifreeze mode.

[0017] The beneficial effects of the utility model are as follows: the utility model provides a heat pump chiller system. In a tropical climate country or region with a high temperature, the refrigerant flows from the compressor to the condenser, passes through the electronic expansion valve, exchanges heat through the evaporator, and finally returns to the compressor. In this way, the heat exchange is circulated, and only single refrigeration is performed, and there is no need for heating and defrosting mode. A circulation pipe is provided between the water inlet and the water outlet of the evaporator, and a return water pump and a water flow switch are provided on the circulation pipe to facilitate heat exchange of the circulating water and reduce the indoor temperature. A return water pump is used to ensure sufficient water flow, and an inlet water temperature sensor and an ambient temperature sensor are used to prevent the water temperature from being too low to freeze the pipeline, so as to keep the indoor environment in a more comfortable state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the system principle of the utility model;

[0019] Figure 2 This is a schematic diagram of the control mainboard system of the utility model.

[0020] Among them: 1- compressor, 2- gas-liquid separator, 3- exhaust pipeline, 301- exhaust temperature sensor, 302- high pressure switch, 4- condenser, 5- liquid outlet pipeline, 6- filter, 7- electronic expansion valve, 8- evaporator, 801- heat exchange coil, 811- antifreeze temperature sensor, 802- circulation pipe, 821- return water pump, 822- water flow switch, 823- water inlet temperature sensor, 824- water outlet temperature sensor, 9- return air pipeline, 901- low pressure switch, 902- return air temperature sensor, 10- main controller, 11- ambient temperature sensor, 12- strong power supply module. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below through embodiments and in combination with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present utility model, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0023] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect 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.

[0024] Example 1

[0025] like Figure 1 to Figure 2 As shown, a heat pump chiller system includes a compressor 1, a condenser 4, an evaporator 8 and an ambient temperature sensor 11. The air outlet of the compressor is connected to the inlet of the condenser through an exhaust pipe 3. A heat exchange coil 801 is provided in the evaporator. The inlet of the heat exchange coil is connected to the outlet of the condenser through a liquid outlet pipe 5. The liquid outlet pipe is provided with a filter 6 and an electronic expansion valve 7 in sequence along the liquid outlet direction. The inlet of the heat exchange coil is connected to the return air port of the compressor through a return air pipe 9;

[0026] An exhaust temperature sensor 301 and a high pressure switch 302 are provided in sequence along the exhaust direction of the exhaust pipeline, an antifreeze temperature sensor 811 is provided at the inlet of the heat exchange coil, and a low pressure switch 901, a return air temperature sensor 902 and a gas-liquid separator 2 are provided in sequence along the return air pipeline in the return air direction.

[0027] The evaporator 8 is also provided with a water inlet and a water outlet. The water inlet is connected to a water inlet pipeline, on which a water inlet temperature sensor 823 is provided. The water outlet is connected to a water outlet pipeline, on which a water outlet temperature sensor 824 is provided.

[0028] The refrigerant circulates in the whole system. After the compressor compresses the refrigerant, the liquid refrigerant forms a high-temperature and high-pressure gaseous refrigerant. The gaseous refrigerant is condensed by the condenser to form a medium-temperature and high-pressure gaseous refrigerant. The gaseous refrigerant is throttled by the electronic expansion valve 7 to form a low-temperature and low-pressure gas-liquid mixed refrigerant, and finally passes through the evaporator to form a low-temperature and low-pressure gaseous refrigerant.

[0029] A circulation pipe 802 is provided between the water inlet and the water outlet of the evaporator. A return water pump 821 and a water flow switch 822 are provided on the circulation pipe. Both the return water pump and the water flow switch are connected to the main controller for communication. Circulating water is provided in the circulation pipe.

[0030] The circulating water enters the water inlet pipe along the water inlet, and the water inlet temperature sensor 823 measures the temperature of the circulating water in the water inlet pipe in real time. The circulating water exchanges heat with the low-temperature and low-pressure gas-liquid refrigerant in the evaporator, and transfers heat to the low-temperature and low-pressure mixed refrigerant to form a low-temperature and low-pressure gaseous refrigerant. After releasing heat, the circulating water is discharged along the water outlet pipe, and the outlet water temperature in the water outlet pipe is monitored in real time by the outlet water temperature sensor.

[0031] The system also includes a main control board, which is provided with a main controller 10, a strong power supply module 12 and a switch power supply transformer module. The strong power supply module receives the mains power, and is electrically connected to the COM terminal of the compressor relay and the main controller. The 220V / 50Hz power supply voltage is passed through a three-terminal block, so that the main control board receives the mains power, wherein the live wire is connected to the COM terminal of the compressor relay, and the main board is supplied with strong power at the same time, and the neutral wire is connected to the neutral wire N terminal of the main board.

[0032] The switching power supply transformer module rectifies, filters and transforms 220V AC power into 12V and 5V DC power. The switching power supply transformer module is electrically connected to the electronic expansion valve, the ambient temperature sensor, the exhaust temperature sensor, the return air temperature sensor, the water inlet temperature sensor and the water outlet temperature sensor. The switching power supply transformer module provides stable power to the electronic expansion valve, the ambient temperature sensor, the exhaust temperature sensor, the return air temperature sensor, the water inlet temperature sensor and the water outlet temperature sensor.

[0033] The main controller is connected to the electronic expansion valve 7, the ambient temperature sensor 11, the exhaust temperature sensor 301, the return air temperature sensor 902, the water inlet temperature sensor 823 and the water outlet temperature sensor 824. The main controller controls the electronic expansion valve, the ambient temperature sensor, the exhaust temperature sensor, the return air temperature sensor, the water inlet temperature sensor and the water outlet temperature sensor to work in coordination with each other.

[0034] The compressor is a refrigeration-specific compressor 1, and the compressor is connected to the main controller 10 for communication. The refrigeration-specific compressor includes a start end (S), a run end (R), and a common end (C), wherein the start end and the run end are connected to the two ends of the compressor capacitor to ensure that the compressor can start stably and operate normally; the fan motor of the compressor adopts a single-phase capacitor-operated asynchronous motor, and uses a fan capacitor to ensure that the fan can start stably and operate normally. A return water pump 821 and a water flow switch 822 are provided on the circulation pipe 802. The water flow switch prevents the system water flow from being too small to cause the pipeline to freeze, so that the system can operate more stably.

[0035] The inlet and outlet water temperatures are monitored by the inlet water temperature sensor 823 and the outlet water temperature sensor 824 to adjust the start and stop status of the compressor to maintain a comfortable temperature environment indoors. The inlet water temperature probe 1 is set to detect the real-time inlet water temperature to prevent the system temperature from being too low and freezing the system pipes.

[0036] The system is equipped with a high-pressure switch and a low-pressure switch. The entire system will stop running in time under abnormally high pressure and abnormally low pressure conditions. The exhaust temperature sensor 301 detects the exhaust temperature in real time to prevent the system exhaust temperature from being too high. An antifreeze temperature sensor 811 and a return air temperature sensor 902 are provided. The electronic expansion valve 7 automatically adjusts the opening by judging the superheat. An inlet and outlet water temperature sensor 824 is provided. By monitoring the inlet and outlet water temperatures, the compressor automatically adjusts the operating frequency.

[0037] The system includes a one-way refrigeration mode and an antifreeze mode;

[0038] Example 1

[0039] In tropical environments all year round, the day and night temperatures are relatively high, and the temperature difference is small, so the system will not frost. The system starts the one-way refrigeration mode. The compressor compresses the refrigerant to increase the temperature, enters the condenser for heat exchange and condenses into medium-temperature and high-pressure gas, and then throttles through the electronic expansion valve to obtain a low-temperature and low-pressure gas-liquid mixture, which enters the evaporator and becomes a low-temperature and low-pressure gas. The circulating water enters the water inlet pipeline along the water inlet. The water inlet temperature sensor measures the temperature of the circulating water in the water inlet pipeline in real time. The circulating water exchanges heat with the low-temperature and low-pressure gas-liquid refrigerant in the evaporator, and transfers the heat to the low-temperature and low-pressure mixed refrigerant to form a low-temperature and low-pressure gas refrigerant. After releasing heat, the circulating water is discharged along the outlet pipeline. The outlet water temperature in the outlet pipeline is monitored in real time by the outlet water temperature sensor for one-way refrigeration.

[0040] Example 2

[0041] In the antifreeze mode, the ambient temperature sensor measures the ambient temperature. When the ambient temperature sensor measures an ambient temperature of ≤2°C and the return pump is turned off for more than 30 minutes, the return pump is forced to start for 60 seconds. When the ambient temperature is ≥4°C, the antifreeze mode is exited to maintain the temperature in the system and protect the system pipelines.

[0042] Example 3

[0043] When the ambient temperature sensor fails, the return water pump will be started periodically and run for 60 seconds every 30 minutes. When the unit is in standby or shutdown state and the inlet water temperature is ≤5℃, the heating will be automatically turned on. When the evaporator inlet water temperature is ≥15℃, the heating will be stopped and the antifreeze mode will be exited to maintain the temperature in the system and protect the system pipelines.

[0044] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above 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.

[0045] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A heat pump chiller system, characterized in that: It comprises a compressor (1), a condenser (4), an evaporator (8) and an ambient temperature sensor (11), wherein the air outlet of the compressor is connected to the inlet of the condenser via an exhaust pipe (3), a heat exchange coil (801) is provided in the evaporator, the inlet of the heat exchange coil is connected to the outlet of the condenser via a liquid outlet pipe (5), and the inlet of the heat exchange coil is connected to the return air port of the compressor via a return air pipe (9); An exhaust temperature sensor (301) and a high-pressure switch (302) are sequentially provided on the exhaust pipe (3) along the exhaust direction, an antifreeze temperature sensor (811) is provided at the inlet of the heat exchange coil, and a low-pressure switch (901), a return air temperature sensor (902) and a gas-liquid separator (2) are sequentially provided on the return air pipe along the return air direction.

2. The heat pump chiller system according to claim 1, characterized in that: The liquid outlet pipeline (5) is provided with a filter (6) and an electronic expansion valve (7) in sequence along the liquid outlet direction.

3. The heat pump chiller system according to claim 2, characterized in that: The evaporator is also provided with a water inlet and a water outlet. The water inlet is connected to a water inlet pipeline, on which a water inlet temperature sensor (823) is provided. The water outlet is connected to a water outlet pipeline, on which a water outlet temperature sensor (824) is provided.

4. The heat pump chiller system according to claim 3, characterized in that: The system further comprises a main control board, on which a main controller (10), a strong power supply module (12) and a switch power supply transformer module are arranged. The strong power supply module receives mains power, and is electrically connected to a COM terminal of a compressor relay and is also electrically connected to the main controller.

5. The heat pump chiller system according to claim 4, characterized in that: The switching power supply transformer module rectifies, filters and transforms 220V AC power into 12V and 5V DC power. The switching power supply transformer module is electrically connected to the electronic expansion valve, ambient temperature sensor, exhaust temperature sensor, return air temperature sensor, water inlet temperature sensor and water outlet temperature sensor.

6. The heat pump chiller system according to claim 4, characterized in that: The main controller is communicatively connected to the electronic expansion valve (7), the ambient temperature sensor (11), the exhaust temperature sensor (301), the return air temperature sensor (902), the water inlet temperature sensor (823), and the water outlet temperature sensor (824).

7. The heat pump chiller system according to claim 4, characterized in that: The compressor (1) is a compressor dedicated to refrigeration, and the compressor is communicatively connected to a main controller.

8. The heat pump chiller system according to any one of claims 1 to 7, characterized in that: A circulation pipe (802) is provided between the water inlet and the water outlet of the evaporator, and a return water pump (821) and a water flow switch (822) are provided on the circulation pipe. The return water pump and the water flow switch are both communicatively connected to the main controller, and circulating water is provided in the circulation pipe.

9. The heat pump chiller system according to claim 8, characterized in that: The system includes a one-way refrigeration mode and an antifreeze mode; The system starts the one-way refrigeration mode. The compressor compresses the refrigerant to increase its temperature, enters the condenser for heat exchange and condenses into medium-temperature and high-pressure gas. After throttling through the electronic expansion valve, a low-temperature and low-pressure gas-liquid mixture is obtained, which enters the evaporator and becomes a low-temperature and low-pressure gas. The circulating water exchanges heat with the refrigerant in the evaporator for one-way refrigeration.

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