Refrigeration drying system with buffer room
By introducing a buffer room and dual circulation air duct mechanism into the refrigeration and drying system, combining waste heat recovery and electric heat compensation, the problem of uneven temperature and humidity in the drying box is solved, achieving a lower humidity environment and energy-saving effect.
Patent Information
- Application Number
- CN202421498795.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-27
AI Technical Summary
The existing refrigeration and drying system is difficult to achieve temperature and humidity uniformity in the drying box, resulting in uneven temperature and humidity, affecting cargo storage, and difficult to obtain a low-humidity environment. The existing technology has problems of high energy consumption and uneven temperature and humidity.
A refrigeration and drying system with a buffer room is designed. By setting up a drying box in the buffer room and configuring refrigeration and dehumidification equipment in the buffer room and the drying box, a dual circulation air duct mechanism and a waste heat recovery tube are used, and combined with an electric heating compensation device can achieve uniform control of temperature and humidity.
Effectively ensure the uniformity of temperature and humidity in the drying box, achieve a lower humidity environment (for example, the humidity is reduced from 18% to 13%), and significantly save energy, reduce temperature and humidity fluctuations, and meet the needs of high-precision constant temperature and humidity.
Smart Images
Figure CN222718505U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a refrigeration drying system with a buffer room. Background Art
[0002] As the country pays more and more attention to agriculture and provides more and more support, the requirements for high-precision constant temperature and humidity equipment in agriculture and other fields are becoming more and more numerous and higher.
[0003] Drying boxes and other specific places generally use refrigeration equipment + dehumidifiers to solve the humidity problem. In recent years, the scope of using new equipment and technologies with refrigeration and dehumidification functions has become increasingly widespread. Due to its working principle, the temperature difference in the drying box is large (the temperature difference reaches 8 to 10°C when the humidity is 45% in general situations), and the humidity difference is also large (typically, the humidity rises by about 5% to 15% within 1 to 2 minutes after shutdown, and the fluctuation is large).
[0004] Analysis of the reasons why the existing technology has the above shortcomings: in special constant temperature and humidity occasions such as drying boxes, when refrigeration and dehumidification are used, the evaporator fan motor in the drying box has a low speed due to the refrigeration and dehumidification principle; the refrigeration and dehumidification parameter perception is achieved through sensors, and the lower the temperature and humidity, the lower the wind speed, the smaller the affected range; coupled with factors such as the stacking of goods in the drying box hindering air flow, the circulation range formed is limited, and the temperature and humidity are difficult to penetrate into every corner, resulting in uneven temperature and humidity in the drying box, which has a greater negative impact on the storage of goods and greatly limits the promotion and application of the technology.
[0005] Conventional methods for obtaining ultra-low humidity: professional dehumidifiers are generally used for humidity above 50%, and a few non-standard products can reach about 30%; the disadvantage is that the dehumidifier design is integrated (there are no split dehumidifiers on the market due to many factors), and the heat generated by the compressor refrigeration is discharged indoors, and the matching refrigeration system is needed to balance the heat in order to achieve the requirements of constant temperature and humidity, and the energy consumption is relatively high;
[0006] At the same time, there is uneven temperature and humidity, and a heat island area is formed near the dehumidifier.
[0007] In addition, some specific environments require more stringent conditions:
[0008] (1) All places requiring extremely low humidity conditions (15% ± 2%);
[0009] (2) A location that requires stable temperature and humidity (±1%).
[0010] There are currently no reports of such refrigeration and dehumidification products in the industry.
[0011] In addition, the current method for obtaining low humidity (15% ± 2%) is:
[0012] Use refrigeration and dehumidification (mostly dehumidifiers) to create an external space environment (humidity around 25%):
[0013] Therefore, it is necessary to design a new type of refrigeration and dehumidification system. Utility Model Content
[0014] The technical problem to be solved by the utility model is to provide a refrigeration and drying system with a buffer room, which can effectively ensure the uniformity of (temperature) and humidity in the drying box, realize temperature and humidity control, and promote the efficiency of the original refrigeration and dehumidification system and create a lower humidity environment (for example, when there is no duct system, the system dehumidifies to 18% and it is difficult to reduce it. After using the duct system, it can reach about 13%, and the temperature and humidity fluctuation range is small).
[0015] The technical solution of the utility model is as follows:
[0016] A refrigeration drying system with a buffer room, comprising a buffer room and a drying box arranged in the buffer room;
[0017] The buffer room is equipped with refrigeration and dehumidification equipment;
[0018] The drying box is equipped with a refrigeration and dehumidification device with a waste heat recovery pipe.
[0019] The buffer room is equipped with refrigeration and dehumidification equipment with waste heat recovery pipes.
[0020] A double circulation air duct mechanism is arranged in the drying box, and the double circulation air duct comprises an inner circulation air duct and an outer circulation air duct. The inner circulation fan is used to promote the circulation of air in the inner circulation air duct and the drying box; the outer circulation fan is used to promote the circulation of air in the outer circulation air duct and the drying box.
[0021] The side walls of the buffer room and drying box are equipped with insulation panels.
[0022] The drying box is equipped with an electric heat compensation device. The standby electric heat compensation device is an electric heating tube, which is arranged in the evaporator of the refrigeration and dehumidification equipment and is controlled by the control module.
[0023] The main unit of the refrigeration and dehumidification equipment of the drying box is arranged in the drying box, and the circulating air duct is arranged along the inner wall of the drying box;
[0024] The refrigeration and dehumidification equipment of the drying box includes a refrigeration device and a control module; the refrigeration device includes a compressor, a condenser, an evaporator and an expansion valve; an evaporator fan is provided at the evaporator; the evaporator and the evaporator fan are both arranged in the drying box; the compressor and the condenser are both arranged outside the buffer room.
[0025] The host of the refrigeration and dehumidification equipment in the buffer room is arranged in the buffer room; the refrigeration and dehumidification equipment in the buffer room includes a refrigeration device and a control module; the refrigeration device includes a compressor, a condenser, an evaporator and an expansion valve; an evaporator fan is provided at the evaporator; the evaporator and the evaporator fan are both arranged in the buffer room; the compressor and the condenser are both arranged outside the buffer room.
[0026] Beneficial effects:
[0027] The core of the refrigeration and drying system with a buffer room of the utility model is to set up a buffer room, and then set up a drying box in the buffer room. The temperature and humidity in the buffer room and the drying box are controlled, so that the temperature and humidity in the drying box can be easily reached within the preset range, and the energy saving effect is obvious. In the drying box, a heat preservation board and one or more sets of internal circulation air duct systems are configured, and a general fan is selected as the power, and the top-in and bottom-out or bottom-in and top-out methods are adopted to make the air in the drying box flow fully, greatly reducing the temperature and humidity dead corners in the drying box and effectively improving the uniformity of the temperature and humidity in the drying box.
[0028] By adopting this system, all types of refrigeration equipment with normal configuration can be directly transformed into refrigeration and dehumidification equipment, saving the purchase cost and operating cost of a separate dehumidifier system, as well as the purchase cost and operating cost of the refrigeration equipment that need to be increased due to the heat generated by the balancing dehumidifier. The energy-saving and emission-reduction effects and cost-saving benefits are very significant.
[0029] By configuring a waste heat recovery device for refrigeration equipment indoors to balance the temperature drop caused by refrigeration and dehumidification, not only can rapid dehumidification be achieved, but energy consumption can also be saved.
[0030] In order to obtain ultra-low humidity and maintain the stability of ultra-low humidity, and to overcome the adverse effects of low ambient temperature and to overcome the temperature balance that cannot be achieved under the premise of using the waste heat of the unit, the standby electric heating compensation is started. The electric heating compensation is controlled by the PLC program, and the maximum current is automatically operated when the thermal compensation power is below 80% (the anti-dry burning type of the thermal compensation electric heating tube is generally 100% power when powered on. Although its design has its own safety factor, the adjustment system operates on demand according to the heat demand and is limited to 0-80%, further ensuring that it does not exceed the temperature and current, and further reducing the fire risk caused by overheating from the design), with a high safety factor.
[0031] The utility model uses traditional standard refrigeration equipment, which only needs to be slightly adjusted and customized according to different humidity requirements, does not require the production of professional equipment, and is conducive to making full use of existing social production resources.
[0032] Due to its refrigeration and dehumidification characteristics and PLC programming technology, the unit operates within the rated conditions for a long time, greatly extending its operating life.
[0033] The utility model can greatly improve the uniformity of temperature and humidity in a specific place in a drying box that requires constant temperature and humidity, and meet the needs of a high-precision constant temperature and humidity place.
[0034] By adopting the system and method of the utility model, the humidity can reach a stable state of 15%±1°C.
[0035] The core principle of the present invention is that when realizing dehumidification control, in order to reduce energy consumption, the temperature in the drying box is raised by waste heat recovery first. If necessary, the heating tube is started to raise the temperature in the cold drying box so that the humidity is within a preset range. In the present invention, dehumidification is highlighted first, and refrigeration is a by-product of the dehumidification process (normal drying box refrigeration equipment has a radiator outside the warehouse. If there is no heat supplement during the dehumidification process, the temperature must be a falling process; the general standard dehumidifier is designed as an integrated unit. Considering the energy efficiency loss, the cooling capacity is less than the heat generated by the unit, and the temperature rises. The refrigeration unit is needed to balance this heat. This is essentially different from our refrigeration and dehumidification unit. Therefore, the refrigeration and dehumidification unit is designed to recover waste heat to balance the temperature in the drying box and obtain the cheapest heat source; if it is not enough to balance, a little electric heat is used to balance it - this is the core of the present invention.
[0036] The essential differences between the present invention and the prior art are as follows: 1. The main function of the refrigeration equipment is to reduce the air in the enclosed space to the required temperature, with a certain dehumidification effect, but it is not obvious and has no actual commercial value; 2. The refrigeration and dehumidification equipment is the opposite: through various measures to create an ideal dehumidification environment, the refrigeration temperature is reduced and becomes a by-product, which is equivalent to saving all the power consumption of the traditional dehumidifier, so the energy-saving effect is significant; 3. The use of the present invention is equivalent to dividing the traditional dehumidifier into an internal dehumidifier and an external dehumidifier, and the control module controls whether the heat of the external dehumidifier is directly discharged into the outside air or recovered for use in the warehouse.
[0037] Practice has proved that the application of the utility model can achieve the effects of refrigeration and dehumidification, and the energy-saving effect is obvious. BRIEF DESCRIPTION OF THE DRAWINGS
[0038] Figure 1 It is a schematic diagram of the overall structure of a refrigeration drying system with a buffer room (top view);
[0039] Figure 2 It is a schematic diagram of the overall structure of a refrigeration drying system with a buffer room (right view);
[0040] Figure 3 It is a schematic diagram of air circulation in a refrigeration drying system with a buffer room;
[0041] Figure 4 It is the temperature change curve.
[0042] Explanation of reference numerals: 1-second interlayer, 2-indoor refrigeration dehumidifier, 31-internal circulation fan, 32-external circulation fan; 4-first interlayer, 51-bottom internal circulation air hole, 52-bottom external circulation air hole, 53-top internal circulation air hole, 54-top external circulation air hole. 61-internal circulation air duct, 62-external circulation air duct. 71-first compressor unit, 72-second compressor unit; 8-first valve, 9-waste heat recovery pipe, 10-evaporator pipe.
[0043] 11- buffer room; 12- drying box; 13- insulation board; 14- expansion valve, 15- second valve. DETAILED DESCRIPTION
[0044] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
[0045] Example 1: Figure 1-4 , a refrigeration drying system with a buffer room, comprising a buffer room and a drying box arranged in the buffer room;
[0046] The buffer room is equipped with refrigeration and dehumidification equipment;
[0047] The drying box is equipped with a refrigeration and dehumidification device with a waste heat recovery pipe.
[0048] The buffer room is equipped with refrigeration and dehumidification equipment with waste heat recovery pipes.
[0049] A double circulation air duct mechanism is arranged in the drying box, and the double circulation air duct comprises an inner circulation air duct and an outer circulation air duct. The inner circulation fan is used to promote the circulation of air in the inner circulation air duct and the drying box; the outer circulation fan is used to promote the circulation of air in the outer circulation air duct and the drying box.
[0050] The side walls of the buffer room and drying box are equipped with insulation panels.
[0051] The drying box is equipped with an electric heat compensation device. The standby electric heat compensation device is an electric heating tube, which is arranged in the evaporator of the refrigeration and dehumidification equipment and is controlled by the control module.
[0052] The main unit of the refrigeration and dehumidification equipment of the drying box is arranged in the drying box, and the circulating air duct is arranged along the inner wall of the drying box;
[0053] The refrigeration and dehumidification equipment of the drying box includes a refrigeration device and a control module; the refrigeration device includes a compressor, a condenser, an evaporator and an expansion valve; an evaporator fan is provided at the evaporator; the evaporator and the evaporator fan are both arranged in the drying box; the compressor and the condenser are both arranged outside the buffer room.
[0054] The host of the refrigeration and dehumidification equipment in the buffer room is arranged in the buffer room; the refrigeration and dehumidification equipment in the buffer room includes a refrigeration device and a control module; the refrigeration device includes a compressor, a condenser, an evaporator and an expansion valve; an evaporator fan is provided at the evaporator; the evaporator and the evaporator fan are both arranged in the buffer room; the compressor and the condenser are both arranged outside the buffer room.
[0055] In the drying box, the main unit of the refrigeration and dehumidifier is arranged inside the drying box, and the circulating air duct is arranged along the inner wall of the drying box;
[0056] The refrigeration dehumidifier includes a refrigeration device and a control module; the refrigeration device includes a compressor, a condenser, an evaporator and an expansion valve (installed behind the condenser and the solenoid valve and in front of the evaporator. Specifically, the condenser is connected to the expansion valve through a pipeline via a second valve (220V solenoid valve), and the expansion valve is connected to the evaporator through a pipeline.
[0057] The specific working process is:
[0058] The compressor sucks in low-temperature and low-pressure gas and compresses it into high-temperature and high-pressure gas → condenser: condenses the high-temperature and high-pressure gas into room-temperature liquid → expansion valve: converts the high-pressure liquid into a low-temperature and low-pressure gas-liquid mixture and sends it to the evaporator → evaporator: further evaporates the gas-liquid mixture into a low-temperature and low-pressure gas, and this process absorbs heat); an evaporator fan is provided at the evaporator; the evaporator and the evaporator fan are both arranged in a drying box; the compressor and the condenser are both arranged outside the drying box; it also includes a speed regulator controlled by a control module; the speed regulator is used to control the speed of the evaporator fan; it also includes a temperature sensor and a humidity sensor connected to the control module.
[0059] The control module is used to reduce the speed of the evaporator fan through the speed regulator, and further control the input of the waste heat recovery pipe (auxiliary radiator) and the input of the electric heating compensation device, so as to further control the humidity.
[0060] An auxiliary radiator is arranged in the circulating air duct in the drying box as a waste heat recovery device; a first valve controlled by the control module is arranged on the connecting pipe between the auxiliary radiator and the compressor. When the first valve is opened, the waste heat of the compressor can be fully utilized. The first valve is a 220V solenoid valve.
[0061] The room is equipped with a backup electric heating compensation device; the backup electric heating compensation device is a heating tube, which is arranged in the evaporator, using the shell space of the evaporator and its fan, without occupying extra space, and the heating tube is controlled by the control module. (The heating tube can also be preferably arranged outside the evaporation fins of the evaporator to create a better condensation environment. The heating tube can also be arranged outside the shell of the evaporator)
[0062] The side wall of the drying box has a first interlayer, the top of the drying box has a second interlayer, the side wall and the top plate of the drying box are provided with air holes, the air holes are used to connect the first interlayer and the second interlayer with the middle cavity of the drying box; the first interlayer is connected with the second interlayer; the first interlayer, the second interlayer and the air holes form the circulating air duct;
[0063] The fan is arranged in the first interlayer or the second interlayer, or the fan is arranged outside the air hole (not in the interlayer, but in the drying box).
[0064] The root of the side wall is provided with a bottom inner circulation air hole 51 and a bottom outer circulation air hole 52; the bottom inner circulation air hole is located above the bottom outer circulation air hole;
[0065] The top plate of the drying box is provided with a top inner circulation air hole 53 and a top outer circulation air hole 54;
[0066] The top inner circulation air hole, the second interlayer, the first interlayer and the bottom inner circulation air hole form the inner circulation air duct;
[0067] The top external circulation air holes, the second interlayer, the first interlayer and the bottom external circulation air holes form the external circulation air duct.
[0068] The internal circulation fan is arranged below the internal circulation air hole at the top; the external circulation fan is arranged at the external circulation air hole at the top and is located on the outside of the second interlayer.
[0069] The number of the circulating air ducts is 2 or 4; and they are relatively symmetrically arranged (i.e., the front and rear side walls are arranged, and / or
[0070] Or left and right side wall settings), you can also configure more circulation ducts to meet the use requirements according to irregular environments. For example, 3-10 groups of circulation ducts It will be all right .
[0071] The fans are all controlled by the control module.
[0072] The refrigeration dehumidifier is arranged on the top of the drying box, and the air outlet of the dehumidifier is connected with the external circulation air hole at the top of the external circulation air duct.
[0073] The utility model can realize a double 15 constant temperature and humidity laboratory (drying box), and can achieve the temperature and humidity index: 15℃±1℃ / 15%± / 1%
[0074] After the refrigeration and dehumidification equipment is started, one or more circulation fans in the drying box are started synchronously to transport the air in the drying box from the high (or low) place in the drying box to different positions in the low (or high) place in the drying box through the air duct; after the refrigeration and dehumidification equipment is shut down, the fan circulation system can choose to shut down synchronously, or choose to delay shutdown according to different requirements to ensure the uniformity of temperature and humidity in the drying box.
[0075] Under the control of the controller, the refrigeration and dehumidification equipment and the fan can be stopped at the same time or with a delay, and other control circulation fan working modes can be achieved. Its function is to meet the requirements of temperature difference and humidity difference in occasions with different temperature and humidity requirements.
[0076] Comparison table of dehumidification technology performance of the dehumidification system of the utility model and the existing dehumidification system
[0077]
[0078]
[0079] It can be seen that the solution of the utility model has more accurate temperature and humidity control, and the number of equipment starts and stops is reduced, which is conducive to the long-term stable operation of the equipment.
[0080] like Figure 4 ,This curve is the operating curve of a certain day. It can be seen from the figure that the humidity reaches the set value after more than ten minutes of no-load operation.
[0081] Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model should be included in the protection scope of this utility model.
Claims
1. A refrigeration drying system with a buffer room, characterized in that: It comprises a buffer room (11) and a drying box (12) arranged in the buffer room; The buffer room is equipped with refrigeration and dehumidification equipment; The drying box is equipped with a refrigeration and dehumidification device with a waste heat recovery pipe.
2. The refrigeration and drying system with a buffer room according to claim 1, characterized in that: The buffer room is equipped with refrigeration and dehumidification equipment with waste heat recovery pipes.
3. The refrigeration and drying system with a buffer room according to claim 1, characterized in that: A double circulation air duct mechanism is arranged in the drying box, and the double circulation air duct comprises an inner circulation air duct and an outer circulation air duct.
4. The refrigeration and drying system with a buffer room according to claim 1, characterized in that: The side walls of the buffer room and the drying box are both provided with heat-insulating plates (13).
5. The refrigeration and drying system with a buffer room according to claim 1, characterized in that: The drying box is equipped with an electric heating compensation device.
6. The refrigeration and drying system with a buffer room according to claim 5, characterized in that: The standby electric heating compensation device is an electric heating tube, which is arranged in the evaporator of the refrigeration and dehumidification equipment and is controlled by the control module.
7. The refrigeration and drying system with a buffer room according to any one of claims 1 to 6, characterized in that: The main unit of the refrigeration and dehumidification equipment of the drying box is arranged in the drying box, and the circulating air duct is arranged along the inner wall of the drying box; The refrigeration and dehumidification equipment of the drying box includes a refrigeration device and a control module; the refrigeration device includes a compressor, a condenser, an evaporator and an expansion valve; an evaporator fan is provided at the evaporator; the evaporator and the evaporator fan are both arranged in the drying box; the compressor and the condenser are both arranged outside the buffer room.
8. The refrigeration and drying system with a buffer room according to claim 7, characterized in that: The host of the refrigeration and dehumidification equipment in the buffer room is arranged in the buffer room; the refrigeration and dehumidification equipment in the buffer room includes a refrigeration device and a control module; The refrigeration device comprises a compressor, a condenser, an evaporator and an expansion valve; an evaporator fan is provided at the evaporator; The evaporator and the evaporator fan are both arranged in the buffer room; the compressor and the condenser are both arranged outside the buffer room.