Double-effect double-temperature-control heat pump unit

Abstract

The utility model relates to the technical field of heating ventilation air conditioning heat pumps, in particular to a double-effect double-temperature-control heat pump unit, and aims to solve the technical problem that a heat pump system in the prior art cannot achieve independent and accurate temperature control on the cold side and the hot side. The system comprises a condenser, an evaporator, an electronic expansion valve, a compressor, a liquid spraying enthalpy increasing device, an anti-supercooling device and an intelligent full-automatic control system, and dynamic compensation and adjustment of the temperature of the cold side of the evaporator are achieved through the synergistic effect of the liquid spraying enthalpy increasing device and the anti-supercooling device in combination with a closed-loop feedback control strategy; meanwhile, independent setting and stable control over the temperature of the hot side are achieved through a heat adjusting device between the condenser and the compressor. The utility model has the advantages of high temperature control precision, strong operation stability, high energy efficiency ratio, wide application range and the like, and is suitable for combined cooling and heating occasions with higher temperature control requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of heating ventilation air conditioning heat pump, especially a double -effect double -controlled temperature heat pump unit. BACKGROUND

[0002] In the field of heating ventilation air conditioning heat pump, the existing heat pump unit is mostly single -effect single -controlled temperature type. In the refrigeration mode, only the refrigeration side temperature can be accurately controlled and set, and the heating side temperature cannot be controlled and set, leading to the inability to effectively realize the heat side accurate heating, when heating, only the heating side temperature can be accurately controlled and set, and the refrigeration side temperature is uncontrollable, and it is difficult to realize the cold side accurate cooling. This limitation makes the existing heat pump unit unable to build a cold and hot combined supply system that meets the requirement of accurate temperature control, and in actual application, it cannot meet the needs of users for different temperatures of cold and heat, the energy utilization efficiency is low, and it cannot fully adapt to the demand of modern buildings and industrial fields for efficient, intelligent and accurate temperature control equipment, and technical innovation improvement is urgently needed.

[0003] Some related technologies are disclosed in the prior art, such as the patent application with publication number CN101900448B (applicant: Teling Air Conditioning System (China) Co., Ltd.; publication date: 2013-12-11) discloses a steam injection enthalpy increasing heat pump air conditioning hot water unit. The technical scheme introduces the steam injection enthalpy increasing technology, so that the heat pump air conditioning hot water unit can stably operate under the condition that the ambient temperature is as low as -15℃, and the hot water outlet temperature is increased to 63℃, thereby significantly improving the low-temperature heating performance, prolonging the service life of the equipment, and meeting the demand for building cooling, heating and hot water throughout the year.

[0004] However, it still has the following technical problems: although the technology improves the heating capacity of the system in low-temperature environment, its control logic is still based on the traditional single-effect single-temperature control mode, that is, when the refrigeration or heating mode is switched, only the current side temperature can be accurately controlled, and the simultaneous setting and adjustment of the cold and hot side temperatures cannot be realized. Therefore, in the application scene requiring cold and hot combined supply, the system is difficult to meet the accurate temperature control demand of the cold and hot sides respectively, leading to the reduction of energy utilization efficiency, and the system response lag, and the insufficient control precision. In addition, since no dynamic adjustment mechanism for the excess or insufficient heat of the evaporator cold side is set, the system is prone to overcooling or undercooling under extreme load changes, affecting the overall operation stability and comfort.

[0005] For example, patent application CN202002391U (applicant: Shandong Oukai Air-Conditioning Technology Co., Ltd.; publication date: 2011-10-05) discloses a liquid-injection enthalpy-increasing heat pump water heater unit. The technology sets an economizer to make part of the liquid refrigerant throttling evaporate to absorb heat when the evaporation temperature is low (lower than -25℃), so that another part of the refrigerant obtains supercooling effect and enters the compressor through air supplementing circulation, thereby improving refrigerating capacity, improving compressor refrigeration cycle efficiency and reducing exhaust temperature, and thus improving system COP value.

[0006] However, in actual application, the following technical problems often exist: although the technology realizes partial optimization of the compressor refrigeration cycle through the economizer, it does not involve effective regulation means for temperature fluctuation of the cold side of the evaporator, and lacks real-time compensation and regulation mechanism for heat deficiency at the inlet of the evaporator or heat excess at the outlet of the evaporator. This makes it difficult for the system to maintain the stability of the cold side temperature of the evaporator under the condition of frequent load changes, and easily causes problems of large cooling temperature fluctuation and poor temperature control accuracy. At the same time, the system also does not solve the problem of independent control of the two sides of the temperature in the cold and heat combined supply scene, and cannot realize the efficient operation mode of one machine for two purposes, which limits its applicability in high-precision temperature control demand occasions. Practical new type content

[0007] The present application discloses a double-effect double-control-temperature heat pump unit system, which can solve the above-mentioned technical problems to some extent. The system comprises a condenser, an evaporator, an electronic expansion valve, a compressor, a liquid-injection enthalpy-increasing device, an anti-supercooling device and a smart full-automatic control system. By setting a temperature sensor at the inlet of the evaporator, the liquid-injection enthalpy-increasing device is combined to deliver high-temperature medium to the cold side of the evaporator as needed, to realize accurate compensation and temperature control when heat is insufficient; at the same time, a temperature sensor is set at the outlet of the evaporator, and the anti-supercooling device is combined to bypass the excess heat through the evaporator and directly deliver it to the inlet of the compressor, to realize accurate regulation and temperature control when there is too much heat. Through the synergistic effect of the above-mentioned structural design and intelligent control strategy, the present application can realize independent setting and synchronous regulation of the temperatures of the cold and hot sides, significantly improve the temperature control accuracy and operation efficiency of the system in the cold and heat combined supply scene, has multiple advantages of energy saving, environmental protection, safety, etc., and is especially suitable for industrial and commercial application fields with high temperature control requirements. The practical new type specifically adopts the following technical solutions.

[0008] The utility model discloses a kind of double-effect double-control temperature heat pump units, including evaporator, compressor, condenser, throttling valve sequentially connected by pipeline circulation, also include liquid injection enthalpy increasing device and anti-subcooling device, the liquid injection enthalpy increasing device one end is connected between the outlet of compressor and the inlet of condenser by pipeline, the other end is connected between the outlet of throttling valve and the inlet of evaporator by pipeline;The anti-subcooling device one end is connected between the outlet of evaporator and the inlet of compressor by pipeline, the other end is connected between the outlet of throttling valve and the inlet of evaporator by pipeline;

[0009] Also include temperature sensor respectively arranged at evaporator inlet and outlet, and automatic control system, the automatic control system according to the feedback signal of temperature sensor, to adjust the working state of the liquid injection enthalpy increasing device and anti-subcooling device, to realize the independent accurate temperature control of cold and hot sides;

[0010] The automatic control system includes data acquisition module, data processing module, control execution module, the data acquisition module is used to gather the data of evaporator inlet temperature sensor and evaporator outlet temperature sensor, the data processing module is used to calculate the required heat or excess heat according to the data collected, and generates control instruction, the control execution module is used to control the work of liquid injection enthalpy increasing device and anti-subcooling device according to control instruction.

[0011] Preferably, the liquid injection enthalpy increasing device includes regulating valve, and the regulating valve adjusts the flow of high-temperature medium from the condenser to the evaporator according to the instruction of the automatic control system.

[0012] Preferably, the anti-subcooling device includes bypass valve, and the bypass valve adjusts the bypass flow of low-temperature medium from the outlet of the throttling valve to the inlet of the compressor according to the instruction of the automatic control system.

[0013] Preferably, the automatic control system further includes a man-machine interface for setting target temperature values of the evaporator inlet and outlet and displaying real-time unit operating parameters.

[0014] The utility model has the advantages that:

[0015] 1. The utility model realizes accurate setting and control of the temperature of the hot side and the cold side of the heat pump unit, breaks through the limitation of traditional single-effect single-control temperature, can meet different use conditions of the cold side and the hot side at the same time, realizes cold and heat supply, achieves one-machine two-use effect, and improves equipment function diversity and practicality.

[0016] 2. The utility model works cooperatively with the liquid injection enthalpy increasing device and the anti-subcooling device and the automatic control system, accurately controls the temperature of the cold side to meet the refrigeration demand, the heat of the hot side can be obtained for free, and the cooling load of the hot side during conventional refrigeration is saved, which is a low-carbon or even carbon-negative product for the heating system, significantly improves energy utilization efficiency, has great significance in energy saving and emission reduction, and reduces operation cost.

[0017] 3. The automatic control system integrates data acquisition, processing, and execution modules. Based on feedback signals from temperature sensors, it automatically adjusts the operating status of the liquid injection enthalpy enhancement device and the anti-overcooling device to achieve intelligent and precise temperature control. The human-machine interface allows users to easily set target temperature values ​​and view unit operating parameters in real time, providing convenient and intuitive operation and enhancing the user experience. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] The following are the labels in the diagram: 1 Evaporator, 2 Compressor, 3 Condenser, 4 Liquid injection enthalpy enhancement device, 5 Anti-overcooling device, 6 Throttling valve. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] Example 1

[0022] A dual-effect, dual-temperature-controlled heat pump unit, such as Figure 1 As shown, the heat pump unit includes an evaporator 1, a compressor 2, a condenser 3, and a throttling valve 6, which are sequentially connected by pipes. These core components circulate through the pipes, transferring heat under the action of the refrigerant, similar to the principle of a conventional heat pump unit. It also includes a liquid injection enthalpy-increasing device 4 and an anti-overcooling device 5. One end of the liquid injection enthalpy-increasing device 4 is connected via a pipe between the outlet of the compressor 2 and the inlet of the condenser 3, and the other end is connected via a pipe between the outlet of the throttling valve 6 and the inlet of the evaporator 1. Similarly, one end of the anti-overcooling device 5 is connected via a pipe between the outlet of the evaporator 1 and the inlet of the compressor 2, and the other end is connected via a pipe between the outlet of the throttling valve 6 and the inlet of the evaporator 1.

[0023] It also includes temperature sensors installed at the inlet and outlet of the evaporator 1, as well as an automatic control system. The automatic control system adjusts the working status of the liquid spray enthalpy enhancement device 4 and the anti-overcooling device 5 according to the feedback signal of the temperature sensor, so as to achieve independent and precise temperature control on both the hot and cold sides.

[0024] The liquid injection enthalpy enhancement device 4 includes a regulating valve, which adjusts the flow rate of the high-temperature medium from the condenser 3 to the evaporator 1 according to the instructions of the automatic control system. Based on the principle of on-demand adjustment, the liquid injection enthalpy enhancement device 4 introduces a high-temperature medium from the condenser 3 side to compensate for the heat when the cold side of the evaporator 1 is insufficient.

[0025] The anti-subcooling device 5 comprises a bypass valve which adjusts the bypass amount of the low-temperature medium from the outlet of the throttling valve 6 to the inlet of the compressor 2 according to the instruction of the automatic control system. When the heat on the cold side of the evaporator 1 is excessive, the anti-subcooling device 5 bypasses the low-temperature medium and reduces the flow of the heat-absorbing medium into the evaporator 1 to adjust the heat.

[0026] The automatic control system comprises a data acquisition module, a data processing module, a control execution module and a man-machine interaction interface. The data acquisition module is used for acquiring the data of the temperature sensors at the inlet and outlet of the evaporator 1. The data processing module is used for calculating the required heat or excessive heat according to the acquired data and generating a control instruction. The control execution module is used for controlling the operation of the liquid-injection enthalpy-increasing device 4 and the anti-subcooling device 5 according to the control instruction. The automatic control system acquires data by means of the temperature sensors arranged at the inlet and outlet of the evaporator 1, cooperates with the data acquisition module, the data processing module and the execution module, accurately controls the liquid-injection enthalpy-increasing device 4 and the anti-subcooling device 5, and realizes independent and accurate temperature control on the cold side and the hot side. The man-machine interaction interface is used for setting the target temperature values at the inlet and outlet of the evaporator 1 and displaying the operating parameters of the unit in real time.

[0027] The working process of the utility model is as follows: first, the operator sets the target temperature values at the inlet and outlet of the evaporator 1 through the man-machine interaction interface. During operation, the data acquisition module acquires the data of the temperature sensors at the inlet and outlet of the evaporator 1 in real time.

[0028] In the refrigeration mode, when the inlet temperature sensor of the evaporator 1 monitors that the inlet temperature is lower than the set temperature, the data processing module is started and the required supplementary heat is calculated according to the acquired data. Then, the control execution module of the automatic control system controls the opening of the regulating valve in the liquid-injection enthalpy-increasing device 4 according to the PID control strategy, so that the high-temperature medium on the inlet side of the condenser 3 flows from between the outlet of the compressor 2 and the inlet of the condenser 3 to between the outlet of the throttling valve 6 and the inlet of the evaporator 1 through the pipeline, is delivered to the cold-temperature medium at the inlet of the evaporator 1, compensates for the insufficient heat on the cold side of the evaporator 1, and ensures that the temperature on the cold side meets the refrigeration requirement. When the outlet temperature sensor of the evaporator 1 monitors that the outlet temperature is higher than the set temperature, the data processing module calculates the excessive heat. The control execution module controls the opening of the bypass valve in the anti-subcooling device 5, so that the excessive heat is directly delivered from the outlet of the throttling valve 6 to the inlet of the compressor 2 and does not enter the evaporator 1, thereby reducing the flow of the heat-absorbing medium into the evaporator 1 and adjusting the excessive heat on the cold side of the evaporator 1, so as to maintain the stability of the temperature on the cold side.

[0029] In the heating mode, the system also monitors the inlet and outlet temperatures of the evaporator 1 through the temperature sensor. The excess heat on the cold side is treated by the anti-subcooling device 5 to avoid the overcooling of the evaporator 1 affecting the heating efficiency; the heat side utilizes the liquid injection enthalpy increasing device 4 and the like to work cooperatively to precisely control the temperature of the heat side. Meanwhile, the heat generated by the heat side can be directly utilized without additional cooling, thereby improving the energy utilization efficiency, realizing the combined cooling and heating, and having the energy saving and emission reduction advantages for the heating system.

[0030] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing detailed description of the present application is made with reference to the foregoing embodiments, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement; any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included within the scope of the present application.

Claims

1. A dual-effect dual-temperature heat pump unit, characterized in that, The device comprises an evaporator, a compressor, a condenser and a throttle valve connected in sequence by pipes, a liquid injection enthalpy increasing device and an anti-subcooling device, one end of the liquid injection enthalpy increasing device is connected by a pipe between the outlet of the compressor and the inlet of the condenser, and the other end is connected by a pipe between the outlet of the throttle valve and the inlet of the evaporator; one end of the anti-subcooling device is connected by a pipe between the outlet of the evaporator and the inlet of the compressor, and the other end is connected by a pipe between the outlet of the throttle valve and the inlet of the evaporator; It also comprises temperature sensors respectively arranged at the inlet and outlet of the evaporator, and an automatic control system, which adjusts the working state of the liquid injection enthalpy increasing device and the anti-subcooling device according to the feedback signal of the temperature sensors, so as to realize independent and accurate temperature control on the cold and hot sides.

2. The twin-effect twin-temperature heat pump unit according to claim 1, characterized in that: The liquid injection enthalpy increasing device comprises an adjusting valve, which adjusts the flow of high-temperature medium from the condenser to the evaporator according to the instruction of the automatic control system.

3. The twin-effect twin-temperature heat pump unit according to claim 1, characterized in that: The anti-subcooling device comprises a bypass valve, which adjusts the bypass flow of low-temperature medium from the outlet of the throttle valve to the inlet of the compressor according to the instruction of the automatic control system.

4. The twin-efficacy dual-temperature heat pump unit of claim 1, wherein: The automatic control system further comprises a man-machine interface for setting the target temperature values of the inlet and outlet of the evaporator and displaying the operating parameters of the unit in real time.

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