Wide-temperature full-new air conditioning and humidity control split refrigeration device

Abstract

This invention discloses a wide-temperature, fully-controlled, temperature- and humidity-controlled, split-type refrigeration device, comprising a coolant system, a first-stage refrigeration system, and a second-stage refrigeration system. The first and second-stage refrigeration systems each consist of a compressor, condenser, liquid receiver, filter, expansion valve, evaporator, and gas-liquid separator forming a refrigeration cycle loop. The coolant system includes a solution tank, water pump, filter, and heat exchangers A, B, C, and D. These four heat exchangers are arranged in the same air duct and share a fan. A rotary dehumidifier is arranged between two heat exchangers, and an electric heating device is installed on the outlet side of the last heat exchanger. The solution tank, water pump, and filter form a loop with the evaporators in the first and second-stage refrigeration systems via parallel-connected heat exchangers A, B, C, and D. This invention achieves wide-temperature, fully-controlled, temperature- and humidity-controlled airflow, has a simple structure, is convenient to control, and is safe and reliable.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment, specifically a wide-temperature, new air-controlled, temperature- and humidity-controlled split refrigeration device. Background Technology

[0002] The refrigeration unit for air conditioning in special equipment requires a split system (with a large distance between the indoor and outdoor units), 100% fresh air return, stepless cooling, multi-stage heating, and strict dehumidification requirements. Additionally, it must operate within a wide ambient temperature range (-45℃ to 55℃), requiring large air volume and low temperature supply air. In high-temperature conditions (e.g., an ambient temperature of 55℃), the supply air temperature also needs to be low, with a large extreme temperature difference between supply and return air, which is difficult to achieve directly using single-stage refrigeration.

[0003] Currently, split-type refrigeration units with temperature and humidity control directly employ multi-stage compression refrigeration, requiring at least four stages and at least eight indoor and outdoor connecting pipes. This complex piping system hinders compressor oil return and can easily lead to refrigeration system malfunctions. Humidity regulation typically involves multi-stage cooling dehumidification combined with multi-stage electric heating, making the control of electric heating input for dehumidification complex. Cooling capacity adjustment usually employs unloading, variable frequency control, and bypass control. Unloading typically involves shutting down a portion of the cylinders in a multi-cylinder compressor to achieve segmented cooling capacity adjustment, but this cannot achieve precise temperature and humidity control. Variable frequency control uses an inverter connected to the compressor to change the compressor motor frequency, thereby changing the compressor speed to achieve precise temperature control. However, high ambient temperatures place high demands on the inverter module, resulting in high cost and low reliability. Bypass control involves partially discharging compressor exhaust through an electronic bypass valve to the evaporator, achieving stepless adjustment of cooling capacity and thus precise temperature and humidity control. This method is simple, low-cost, and highly reliable.

[0004] Currently, heating methods include heat pump heating, fuel heating, and electric heating. Typically, the heating systems of various specialized equipment (such as vehicles) need to operate in low-temperature outdoor environments, thus placing higher demands on these systems. Heat pump heating performs very poorly at temperatures as low as -45°C and cannot regulate the airflow in spaces requiring heating. Fuel heaters require the addition of finned heat exchangers, utilizing the principle of combustion heat exchange to heat the medium within the finned heat exchanger, thereby heating the air flowing through the fins. Fuel heaters use flow control valves to regulate the flow rate of the medium within the heat exchanger, thus adjusting the heating output. This allows for stepless adjustment, but fuel heaters have a more complex structure, more potential failure points, and lower reliability.

[0005] Electric heating utilizes the Joule effect of electric current to convert electrical energy into heat energy, thereby heating the air flowing through the heater. By tightly connecting the electric heating element and the heat exchanger together, this method not only effectively improves the heat exchange efficiency of the equipment, but also significantly reduces the surface temperature of the heating device by increasing the heat exchange area between the heating device and the air. This effectively prevents the generation of open flames, facilitates the installation of electrical safety devices, and improves the electrothermal safety performance of the equipment. Therefore, it is necessary to integrate electric heating into the refrigeration device to achieve precise temperature and humidity control. Summary of the Invention

[0006] This invention provides a new type of split-type refrigeration device with wide temperature and humidity control, which solves the problem that existing special equipment refrigeration devices cannot achieve precise temperature and humidity control.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] The new wide-temperature, air-controlled, temperature- and humidity-controlled split refrigeration unit includes a coolant system, a first-stage refrigeration system, and a second-stage refrigeration system. The first-stage and second-stage refrigeration systems are each composed of a compressor, condenser, receiver, filter, expansion valve, evaporator, and gas-liquid separator, which are connected by pipelines to form a refrigeration cycle loop. The evaporators in both the first-stage and second-stage refrigeration systems are evaporators with two flow channels. The two flow channels of the evaporator are respectively for the passage of the medium. One flow channel serves as the refrigerant medium flow channel and is used to connect to the corresponding refrigeration cycle loop. The other flow channel of the evaporator serves as the heat exchange flow channel for the passage of the heat exchange medium. Heat exchange is formed between the mediums passing through the two flow channels of the evaporator.

[0009] The coolant system includes a solution tank, a water pump, a filter, and heat exchangers A, B, C, and D. Heat exchangers A, B, C, and D are arranged in a straight line along the same air duct, with heat exchanger B located on the outlet side of heat exchanger A, heat exchanger C on the outlet side of heat exchanger B, and heat exchanger D on the outlet side of heat exchanger C. A rotary dehumidifier is installed between heat exchangers B and C, and an electric heating device is installed on the outlet side of heat exchanger D. Heat exchangers A, B, C, and D share the same fan within the air duct. The outlet of the solution tank is connected to the inlet of the water pump via a pipe, and the outlet of the water pump is connected to the inlet of the filter in the coolant system via a pipe. The filter outlet in the system is connected to the inlet of heat exchangers A, B, C, and D via four pipelines. Each of these four pipelines is connected to an electronic regulating valve. The outlets of heat exchangers A, B, C, and D are connected to the inlet of the heat exchange channel of the evaporator in the first-stage refrigeration system via pipelines. The outlets of heat exchangers A, B, C, and D are also connected to the inlet of the heat exchange channel of the evaporator in the second-stage refrigeration system via pipelines. The outlets of the heat exchange channels of the evaporators in the first and second-stage refrigeration systems are connected to the inlet of the solution tank via pipelines, thus forming a coolant circulation loop.

[0010] Furthermore, in the refrigeration cycle loops of the first-stage refrigeration system and the second-stage refrigeration system, needle valves are installed in the bypass connections between the filters and expansion valves, and pressure sensors are installed on the needle valves.

[0011] Furthermore, in the refrigeration cycle loops of the first-stage refrigeration system and the second-stage refrigeration system, a needle valve for charging refrigerant is connected to the bypass in the pipeline between the evaporator and the gas-liquid separator.

[0012] Furthermore, pressure protectors are installed in the piping between the evaporator and the gas-liquid separator in the refrigeration cycle loops of the first-stage refrigeration system and the second-stage refrigeration system.

[0013] Furthermore, the second-stage refrigeration system also includes an electronic bypass valve. The inlet end of the electronic bypass valve is connected to the pipeline between the compressor and condenser in the second-stage refrigeration system, and the outlet end of the electronic bypass valve is connected to the pipeline between the expansion valve and evaporator in the second-stage refrigeration system.

[0014] Furthermore, the solution tank in the coolant system is equipped with pressure sensors, temperature sensors, and liquid level sensors.

[0015] Furthermore, in the coolant system, a temperature sensor is installed at the outlet of the filter, and a pressure sensor and a flow sensor are installed on each of the four pipes at the outlet of the filter.

[0016] Furthermore, in the coolant system, there are multiple sets of electric heating devices, which are respectively arranged on the air outlet side of heat exchanger D, and each set of electric heating devices is connected to a power source through a thyristor.

[0017] This invention enables gradual reduction of air temperature and control of humidity by employing a two-stage refrigeration system (first and second stages), a coolant system, and a rotary dehumidifier. The coolant system supplies coolant to four heat exchangers within the air duct via four separate channels. The four heat exchangers, the rotary dehumidifier, and the electric heating device are linearly distributed according to the airflow direction. The two-stage refrigeration system sequentially activates the second stage and then the first stage based on the coolant temperature in the solution tank. The first stage can be selectively activated when the coolant temperature is low. Even if one stage refrigeration system fails, the other stage can still ensure a certain level of system operation. The two-stage refrigeration system is more energy-efficient and reliable than a single-stage system. However, considering that simply using bypass regulation is neither economical nor reliable, to ensure temperature control accuracy while balancing cost and reliability, the first stage refrigeration system uses fixed-frequency refrigeration, and the second stage refrigeration system uses bypass regulation via an electronic bypass valve, with the second stage refrigeration system activating first.

[0018] In the coolant system of this invention, the four heat exchangers can be selectively activated under normal operating conditions. Even if one heat exchanger fails, another can still ensure a certain level of system operation. Furthermore, the heating method employs a multi-stage electric heating device with stepless adjustment via a silicon controlled rectifier (SCR). To improve system reliability and interchangeability, multiple sets of electric heating devices are used, each controlled independently by a SCR.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] 1) Achieve wide-temperature, new-type air-controlled temperature and humidity control, and realize reliable cooling and heating operation at high and low temperatures.

[0021] 2) The refrigeration system has fewer stages and fewer connecting pipes than a system that only uses compression refrigeration, and its structure is simpler and easier to control.

[0022] 3) The two-stage cooling system can be selectively turned on when the supply water temperature is not high. If one stage fails, the other stage can still ensure that the system can work to a certain extent.

[0023] 4) The four-stage heat exchanger of the coolant system can be selectively turned on under normal operating conditions. If one stage fails, the other stage can still ensure that the system can operate to a certain extent.

[0024] 5) In a two-stage refrigeration system, the pressure sensor is fixed to the needle valve for easy maintenance and repair. A branch line from the evaporator outlet enters the needle valve via a pipeline for convenient refrigerant charging.

[0025] 6) Adding a pressure protector can effectively protect the refrigeration system, ensuring safety and reliability. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] like Figure 1 As shown, this embodiment discloses a new type of split-type refrigeration device with wide-temperature and air-controlled humidity control, including a coolant system, a first-stage refrigeration system, and a second-stage refrigeration system, wherein:

[0029] The first-stage refrigeration system includes a first-stage compressor 201, a first-stage condenser 202, a first-stage liquid receiver 203, a first-stage filter 204, a first-stage expansion valve 205, a first-stage evaporator 206, and a first-stage gas-liquid separator 207. The first-stage condenser 202 is equipped with an axial flow fan that serves as the first-stage condenser fan 212. The first-stage evaporator 206 has two flow channels for the medium to pass through. One flow channel of the first-stage evaporator 206 serves as the refrigerant medium flow channel, and the other flow channel of the first-stage evaporator 206 serves as the heat exchange medium flow channel. Heat exchange is formed between the media passing through the two flow channels of the first-stage evaporator 206.

[0030] In the first-stage refrigeration system, the outlet of the first-stage compressor 201 is connected to the inlet of the first-stage condenser 202 via a pipeline. The outlet of the first-stage condenser 202 is connected to the inlet of the first-stage liquid receiver 203 via a pipeline. The outlet of the first-stage liquid receiver 203 is connected to the inlet of the first-stage filter 204 via a pipeline. The outlet of the first-stage filter 204 is connected to the inlet of the first-stage expansion valve 205 via a pipeline. The outlet of the first-stage expansion valve 205 is connected to the inlet of the refrigerant channel of the first-stage evaporator 206 via a pipeline. The outlet of the refrigerant channel of the first-stage evaporator 206 is connected to the inlet of the first-stage gas-liquid separator 207 via a pipeline. The outlet of the first-stage gas-liquid separator 207 is connected to the return port of the first-stage compressor 201 via a pipeline. Thus, the refrigerant output from the first-stage compressor 201 passes sequentially through the first-stage condenser 202, the first-stage liquid receiver 203, the first-stage filter 204, the first-stage expansion valve 205, the refrigerant flow channel of the first-stage evaporator 206, and the first-stage gas-liquid separator 207 before returning to the first-stage compressor 201, forming a refrigeration cycle loop.

[0031] In the first-stage refrigeration system, a first-stage needle valve A208 is connected via a bypass pipeline between the outlet of the first-stage filter 204 and the inlet of the first-stage expansion valve 205. A first-stage pressure sensor 211 is installed on the first-stage needle valve 208 to collect the refrigerant pressure data flowing out of the first-stage filter 204. A first-stage needle valve B209 is connected via a bypass pipeline between the refrigerant outlet of the first-stage evaporator 206 and the inlet of the first-stage gas-liquid separator 207 for charging refrigerant into the refrigeration cycle. A first-stage pressure protector 210 is also installed via a pipeline between the refrigerant outlet of the first-stage evaporator 206 and the inlet of the first-stage gas-liquid separator 207 to control the shutdown of the first-stage compressor 201, effectively preventing the first-stage compressor 201 from running dry without refrigerant.

[0032] The second-stage refrigeration system includes a second-stage compressor 301, a second-stage condenser 302, a second-stage liquid receiver 303, a second-stage filter 304, a second-stage expansion valve 305, a second-stage evaporator 306, and a second-stage gas-liquid separator 307. The second-stage condenser 302 is equipped with an axial fan serving as a second-stage condenser fan 313. The second-stage evaporator 306 has two flow channels for the medium to pass through. One flow channel serves as the refrigerant medium flow channel, and the other flow channel serves as the heat exchange medium flow channel. Heat exchange occurs between the media passing through the two flow channels of the second-stage evaporator 306.

[0033] In the second-stage refrigeration system, the outlet of the second-stage compressor 301 is connected to the inlet of the second-stage condenser 302 via a pipeline. The outlet of the second-stage condenser 302 is connected to the inlet of the second-stage liquid receiver 303 via a pipeline. The outlet of the second-stage liquid receiver 303 is connected to the inlet of the second-stage filter 304 via a pipeline. The outlet of the second-stage filter 304 is connected to the inlet of the second-stage expansion valve 305 via a pipeline. The outlet of the second-stage expansion valve 305 is connected to the inlet of the refrigerant channel of the second-stage evaporator 306 via a pipeline. The outlet of the refrigerant channel of the second-stage evaporator 306 is connected to the inlet of the second-stage gas-liquid separator 307 via a pipeline. The outlet of the second-stage gas-liquid separator 307 is connected to the return port of the second-stage compressor 301 via a pipeline. Thus, the refrigerant output from the second-stage compressor 301 passes sequentially through the second-stage condenser 302, the second-stage liquid receiver 303, the second-stage filter 304, the second-stage expansion valve 305, the refrigerant flow channel of the second-stage evaporator 306, and the second-stage gas-liquid separator 307 before returning to the second-stage compressor 301, forming a refrigeration cycle loop.

[0034] In the second-stage refrigeration system, a second-stage needle valve A309 is connected via a bypass pipeline between the outlet of the second-stage filter 304 and the inlet of the second-stage expansion valve 305. A second-stage pressure sensor 312 is installed on the second-stage needle valve 309 to collect the refrigerant pressure data flowing out of the second-stage filter 304. A second-stage needle valve B310 is connected via a bypass pipeline between the refrigerant outlet of the second-stage evaporator 306 and the inlet of the second-stage gas-liquid separator 307 for charging refrigerant into the refrigeration cycle. A second-stage pressure protector 311 is also installed via a pipeline between the refrigerant outlet of the second-stage evaporator 306 and the inlet of the second-stage gas-liquid separator 307 to control the shutdown of the second-stage compressor 301, effectively preventing the second-stage compressor 301 from running dry without refrigerant.

[0035] The second-stage refrigeration system is also equipped with an electronic bypass valve 308. The inlet end of the electronic bypass valve 308 is connected to the pipeline between the outlet end of the second-stage compressor 301 and the inlet end of the second-stage condenser 302 via a bypass pipeline. The outlet end of the electronic bypass valve 308 is connected to the pipeline between the outlet end of the second-stage expansion valve 305 and the inlet end of the refrigerant flow channel of the second-stage evaporator 306 via a bypass pipeline.

[0036] The coolant system includes a solution tank 101, a water pump 103, a filter 105, heat exchangers A110, B111, C112, and D113, a rotary dehumidifier 1, and an electric heating device 2.

[0037] In the coolant system, heat exchangers A110, B111, C112, and D113 are arranged in the same air duct and are linearly distributed in sequence along the airflow direction. Heat exchanger B111 is located on the air outlet side of heat exchanger A110, heat exchanger C112 is located on the air outlet side of heat exchanger B111, and heat exchanger D113 is located on the air outlet side of heat exchanger C112. A rotary dehumidifier is installed between heat exchangers B111 and C112. A centrifugal fan 3 is arranged in the air duct on the air outlet side of heat exchanger D113. Heat exchangers A110, B111, C112, and D113 share the centrifugal fan 3, and the airflow generated by the centrifugal fan 3 carries away the heat from each heat exchanger. There are three sets of electric heating devices 2. All three sets of electric heating devices are arranged on the air outlet side of heat exchanger D113. Each set of electric heating devices 2 is a device that uses electric heating such as resistance wire or electric heating tape. Each set of electric heating devices 2 is connected to the power supply through a thyristor to form an electric circuit. The operation of the electric heating device 2 is controlled by the thyristor through multi-stage adjustment.

[0038] In the coolant system, the outlet of the solution tank 101 is connected to the inlet of the water pump 103 via a pipe with a shut-off valve A102, and the outlet of the water pump 103 is connected to the inlet of the filter 105 in the coolant system via a pipe with a check valve 104.

[0039] The outlet of filter 105 in the coolant system is connected to a main pipeline. The main pipeline has one main pipe and four branch pipes. The main pipe is connected to the outlet of filter 105. The four branch pipes are connected to the inlet of heat exchangers A110, B111, C112, and D113 respectively. An electronic regulating valve A106 is connected to the branch pipe at the inlet of heat exchanger A110, an electronic regulating valve B107 is connected to the branch pipe at the inlet of heat exchanger B111, an electronic regulating valve C108 is connected to the branch pipe at the inlet of heat exchanger C112, and an electronic regulating valve D109 is connected to the branch pipe at the inlet of heat exchanger D113.

[0040] Pressure sensor A123 and flow sensor A127 are installed on the branch pipe at the inlet end of heat exchanger A110; pressure sensor B124 and flow sensor B128 are installed on the branch pipe at the inlet end of heat exchanger B111; pressure sensor C125 and flow sensor C129 are installed on the branch pipe at the inlet end of heat exchanger C112; and pressure sensor D126 and flow sensor D130 are installed on the branch pipe at the inlet end of heat exchanger D113. Each pressure sensor and flow sensor collects the pressure and flow rate data of the coolant in its corresponding branch pipe.

[0041] The outlets of heat exchangers A110, B111, C112, and D113 are connected to a main branch line, which has four branch pipes and two main pipes. Each of the four branch pipes in the main branch line is connected to one of the outlets of heat exchangers A110, B111, C112, and D113. A shut-off valve B114 is connected to the branch pipe at the outlet of heat exchanger A110; a shut-off valve C115 is connected to the branch pipe at the outlet of heat exchanger B111; a shut-off valve D116 is connected to the branch pipe at the outlet of heat exchanger C112; and a shut-off valve E117 is connected to the branch pipe at the outlet of heat exchanger D113. One branch main pipe is connected to the inlet end of the heat exchange channel of the first-stage evaporator 206 in the first-stage refrigeration system, and the other branch main pipe is connected to the inlet end of the heat exchange channel of the second-stage evaporator 306 in the second-stage refrigeration system. The outlet ends of the heat exchange channels of the first-stage evaporator 206 and the second-stage evaporator 306 are connected to the inlet end of the solution tank 101 through pipelines, thus forming a coolant circulation loop.

[0042] In the coolant system, an automatic vent valve 120 is installed at the vent of the solution tank 101, and a drain pipe with a shut-off valve F131 is connected to the drain end of the solution tank 101. A pressure sensor 118, a temperature sensor A119, and a photoelectric level sensor 121 are installed inside the solution tank 101. The pressure sensor 118 collects the internal pressure of the solution tank 101, the temperature sensor A119 collects the internal temperature data of the solution tank 101, and the photoelectric level sensor 121 collects the internal liquid level data of the solution tank 101.

[0043] This embodiment also includes a controller, and the first-stage pressure sensor 211, the second-stage pressure sensor 312, pressure sensor A123, flow sensor A127, pressure sensor B124, flow sensor B128, pressure sensor C125, flow sensor C129, pressure sensor D126, flow sensor D130, pressure sensor 118, temperature sensor A119, and photoelectric liquid level sensor 121 are respectively electrically connected to the controller for signal transmission. In addition, the controller is also electrically connected to the first-stage compressor 201, the second-stage compressor 301, the first-stage condenser fan 212, the second-stage condenser fan 313, the electronic bypass valve 308, the rotary dehumidifier 1, the thyristor configured in the electric heating device 2, the centrifugal fan 3, the water pump 103, and the electronic regulating valves A106, B107, C108, and D109 for control.

[0044] In this embodiment, heat exchangers A110, B111, C112, and D113 in the coolant system are activated sequentially in reverse order. That is, the fourth-stage heat exchanger D113 is activated first, followed by the third-stage heat exchanger C112, then the second-stage heat exchanger B111, and finally the first-stage heat exchanger A110. Specifically, the controller controls the corresponding electronic regulating valve of each heat exchanger to activate it. When the controller activates a previous heat exchanger, it determines whether the next heat exchanger needs to be activated based on the temperature of that heat exchanger. Specifically, the opening degree of electronic regulating valve D109 is determined based on the ambient temperature and the set value. If the set value is not reached even when electronic regulating valve D109 is fully open, then electronic regulating valve C108 is opened. If the set value is not reached even when electronic regulating valves D109 and C108 are fully open, then electronic regulating valve B107 is opened. If the set value is not reached even when electronic regulating valves D109, C108, and B107 are fully open, then electronic regulating valve A106 is opened.

[0045] The working process of the coolant system is as follows:

[0046] First, turn on the fourth-stage heat exchanger D113. The coolant flow direction is: water pump 103 → electronic regulating valve D109 → heat exchanger D113 → shut-off valve E117 → first-stage evaporator 206 (or second-stage evaporator 306) → solution tank 101 → shut-off valve A102 → water pump 103.

[0047] Then turn on the third-stage heat exchanger C112. The coolant flows as follows: water pump 103 → electronic regulating valve C108 → heat exchanger C112 → shut-off valve D116 → first-stage evaporator 206 (or second-stage evaporator 306) → solution tank 101 → shut-off valve A102 → water pump 103.

[0048] Next, turn on the second-stage heat exchanger B111. The coolant flows as follows: water pump 103 → electronic regulating valve B107 → heat exchanger B111 → shut-off valve C115 → first-stage evaporator 206 (or second-stage evaporator 306) → solution tank 101 → shut-off valve A102 → water pump 103.

[0049] Finally, turn on the first-stage heat exchanger A110. The coolant flow direction is: water pump 103 → electronic regulating valve A106 → heat exchanger A110 → shut-off valve B114 → first-stage evaporator 206 (or second-stage evaporator 306) → solution tank 101 → shut-off valve A102 → water pump 103.

[0050] In this embodiment, the refrigerant flow in the first-stage refrigeration system is as follows: first-stage compressor 201 → first-stage condenser 202 → first-stage liquid receiver 203 → first-stage filter 204 → first-stage expansion valve 205 → first-stage evaporator 206 → first-stage gas-liquid separator 207 → first-stage compressor 201.

[0051] In this embodiment, the refrigerant flow direction in the second-stage refrigeration system is as follows: second-stage compressor 301 → second-stage condenser 302 → second-stage liquid receiver 303 → second-stage filter 304 → second-stage expansion valve 305 → second-stage evaporator 306 → second-stage gas-liquid separator 307 → second-stage compressor 301.

[0052] In this embodiment, the refrigeration system operates in the following sequence: the coolant system, the second-stage refrigeration system, and the first-stage refrigeration system are activated sequentially. When the second-stage refrigeration system is running, the second-stage compressor 301 starts, and the opening degree of the electronic bypass valve 308 is controlled based on the temperature value displayed by temperature sensor A119 and the set value. If the electronic bypass valve 308 is completely closed but refrigeration is still required, the first-stage refrigeration system is activated. After 10 minutes, the bypass flow of the electronic bypass valve 308 in the second-stage refrigeration system is determined based on the temperature value displayed by temperature sensor A119.

[0053] Heating mode of this invention:

[0054] Outdoor fresh air → electric heating, using silicon controlled rectifier to regulate heating.

[0055] The refrigeration and dehumidification process and start-up sequence of this invention:

[0056] 1) Under conditions of high ambient temperature (e.g., 10℃ < ambient temperature ≤ 15℃) and high humidity: Outdoor fresh air → dehumidification by rotary dehumidifier 1 (e.g., outlet air temperature rises to 39℃, relative humidity reaches 18%) → cooling and dehumidification by third-stage heat exchanger C112 → cooling and dehumidification by fourth-stage heat exchanger D113 (e.g., reaching the required air outlet temperature of 20℃, relative humidity of 32%). Start-up sequence: First start fourth-stage heat exchanger D113, then start third-stage heat exchanger C112, and finally start rotary dehumidifier 1.

[0057] 2) Under conditions of high ambient temperature (e.g., 15℃ < ambient temperature ≤ 30℃) and high humidity, the three-stage heat exchangers (electronic regulating valves A106, B107, and C108) operate as follows: Outdoor fresh air → after cooling and dehumidification by the second-stage heat exchanger B111 (e.g., outlet air temperature drops to 15℃, relative humidity reaches 98%) → after dehumidification by rotary dehumidifier 1 (e.g., outlet air temperature rises to 39℃, relative humidity reaches 18%) → after cooling and dehumidification by the third-stage heat exchanger C112 → after cooling and dehumidification by the fourth-stage heat exchanger D113 (e.g., reaching the required air outlet temperature of 20℃, relative humidity of 32%). Start-up sequence: First, start the fourth-stage heat exchanger D113, then start the third-stage heat exchanger C112, then start the rotary dehumidifier 1, and finally start the second-stage heat exchanger B111.

[0058] 3) Under conditions of high ambient temperature (e.g., above 30℃) and high humidity, the four-stage heat exchanger dehumidification system (operating electronic regulating valves A106, B107, C108, and D109) operates as follows: Outdoor fresh air → First-stage heat exchanger A110 cooling and dehumidification → Second-stage heat exchanger B111 cooling and dehumidification (e.g., outlet air temperature drops to 15℃, relative humidity reaches 98%) → Rotary dehumidifier 1 dehumidification (e.g., outlet air temperature rises to 39℃, relative humidity reaches 18%) → Third-stage heat exchanger C112 cooling and cooling → Fourth-stage heat exchanger D113 cooling and cooling (e.g., achieving the required air outlet temperature of 20℃ and relative humidity of 32%). Start-up sequence: First, start the fourth-stage heat exchanger D113, then start the third-stage heat exchanger C112, then start the rotary dehumidifier 1, then start the second-stage heat exchanger B111, and finally start the first-stage heat exchanger A110.

[0059] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. These embodiments are merely descriptions of preferred embodiments and are not intended to limit the scope or concept of the invention. The specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. Such combinations, as long as they do not violate the spirit of the present invention, should also be considered as part of this disclosure. To avoid unnecessary repetition, the present invention will not further describe the various possible combinations.

[0060] This invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this invention and without departing from the design idea of ​​this invention, all modifications and improvements made by those skilled in the art to the technical solutions of this invention should fall within the protection scope of this invention. The technical content for which protection is sought in this invention has been fully described in the claims.

Claims

1. A split type refrigerating device for controlling temperature and humidity of a wide temperature range of fresh air, characterized in that, It includes a coolant system, a first-stage refrigeration system, and a second-stage refrigeration system. The first-stage refrigeration system and the second-stage refrigeration system are each composed of a compressor, a condenser, a liquid receiver, a filter, an expansion valve, an evaporator, and a gas-liquid separator, which are connected by pipelines to form a refrigeration cycle loop. The evaporators in the first-stage refrigeration system and the second-stage refrigeration system are both evaporators with two flow channels. The two flow channels of the evaporator are respectively used for the flow of the medium. One flow channel is used as the refrigerant medium flow channel to connect to the corresponding refrigeration cycle loop, and the other flow channel of the evaporator is used as the heat exchange flow channel for the flow of the heat exchange medium. Heat exchange is formed between the mediums flowing through the two flow channels of the evaporator. The coolant system includes a solution tank, a water pump, a filter, and heat exchangers A, B, C, and D. Heat exchangers A, B, C, and D are arranged in a straight line along the same air duct, with heat exchanger B located on the outlet side of heat exchanger A, heat exchanger C on the outlet side of heat exchanger B, and heat exchanger D on the outlet side of heat exchanger C. A rotary dehumidifier is installed between heat exchangers B and C, and an electric heating device is installed on the outlet side of heat exchanger D. Heat exchangers A, B, C, and D share the same fan within the air duct. The outlet of the solution tank is connected to the inlet of the water pump via a pipe, and the outlet of the water pump is connected to the inlet of the filter in the coolant system via a pipe. The filter outlet in the system is connected to the inlet of heat exchangers A, B, C, and D via four pipelines. Each of these four pipelines is connected to an electronic regulating valve. The outlets of heat exchangers A, B, C, and D are connected to the inlet of the heat exchange channel of the evaporator in the first-stage refrigeration system via pipelines. The outlets of heat exchangers A, B, C, and D are also connected to the inlet of the heat exchange channel of the evaporator in the second-stage refrigeration system via pipelines. The outlets of the heat exchange channels of the evaporators in the first and second-stage refrigeration systems are connected to the inlet of the solution tank via pipelines, thus forming a coolant circulation loop.

2. The wide-temperature all-new air temperature and humidity control split refrigeration device according to claim 1, wherein, In the refrigeration cycle loops of the first-stage and second-stage refrigeration systems, needle valves are installed in the bypass connections between the filters and expansion valves, and pressure sensors are installed on the needle valves.

3. The wide-temperature all-new air temperature and humidity control split refrigeration device according to claim 1, characterized in that, In the refrigeration cycle loops of the first-stage and second-stage refrigeration systems, a needle valve for charging refrigerant is connected via a bypass in the pipeline between the evaporator and the gas-liquid separator.

4. The wide-temperature, fresh air-controlled, temperature- and humidity-controlled split-type refrigeration device according to claim 1, characterized in that, Pressure protectors are installed in the piping between the evaporator and the gas-liquid separator in the refrigeration cycle loops of the first-stage and second-stage refrigeration systems.

5. The wide-temperature all-new air temperature and humidity control split refrigeration device according to claim 1, characterized in that, The second-stage refrigeration system also includes an electronic bypass valve. The inlet end of the electronic bypass valve is connected to the pipeline between the compressor and condenser in the second-stage refrigeration system, and the outlet end of the electronic bypass valve is connected to the pipeline between the expansion valve and evaporator in the second-stage refrigeration system.

6. The wide-temperature all-new air temperature and humidity control split refrigeration device according to claim 1, wherein, The solution tank in the coolant system is equipped with a pressure sensor, a temperature sensor, and a liquid level sensor.

7. The wide-temperature all-new air temperature and humidity control split refrigeration device according to claim 1, wherein, In the coolant system, a temperature sensor is installed at the outlet of the filter, and a pressure sensor and a flow sensor are installed on each of the four pipes at the outlet of the filter.

8. The wide-temperature all-new air temperature and humidity control split refrigeration device according to claim 1, wherein, In the coolant system, there are multiple sets of electric heating devices, which are arranged on the air outlet side of heat exchanger D, and each set of electric heating devices is connected to the power supply through a thyristor.

Images