Tube-and-tube condenser, refrigerator refrigeration system and control method thereof

Abstract

The present application relates to a shell-and-tube condenser, a refrigerator refrigeration system, a control method and a cascade refrigerator refrigeration system, wherein the shell-and-tube condenser comprises: an inner shell for circulating refrigerant; an outer shell for circulating heat exchange medium, wherein the heat exchange medium is cooling water and / or air; the inlet and outlet ends of the outer shell are respectively connected to the water outlet and water inlet of a water tank of a chiller through a water supply pipeline and a return pipeline, and the water supply pipeline and the return pipeline are also respectively connected to an air source device through a first air pipeline and a second air pipeline; the heat exchange medium of the outer shell is switched by controlling the on and off of the first air pipeline, the second air pipeline, the water supply pipeline and / or the return pipeline. The present application provides a condensation heat management solution with dual heat exchange mediums, solves the problem of insufficient stability of the refrigeration system when the chiller fails, and realizes stable heat dissipation throughout the year and centralized management of condensation heat dissipation.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to a shell-and-tube condenser, a refrigerator refrigeration system, a control method and a cascade refrigerator refrigeration system. Background Art

[0002] Commercial refrigerators refer to refrigerated or frozen freezers that are used exclusively for storing ice cream, beverages, dairy products, quick-frozen foods, food materials, etc. in commercial channels such as supermarkets, cold drink shops, frozen food stores, hotels and restaurants.

[0003] Existing commercial refrigerators require large refrigeration power. In order to reduce energy consumption and improve energy efficiency, they basically use water-cooled units. However, the cooling tower or water tank of the water-cooled unit is at risk of freezing in the cold winter, and a certain amount of water storage is required.

[0004] In addition, when multiple refrigerators are running at the same time, the temperature in the area is high and the energy efficiency is low. In this case, the heat can be transferred to the outside through a water cooling system to effectively solve the problem of centralized heat dissipation. However, if the water cooling side of the conventional refrigeration system fails or the water line is cut off in winter, the heat dissipation capacity is insufficient and the temperature inside the refrigerator cannot be guaranteed, which leads to usage restrictions. Summary of the invention

[0005] The embodiments of the present application provide a shell-and-tube condenser, a refrigerator refrigeration system, a control method and a cascade refrigerator refrigeration system, so as to solve the problem of insufficient stability of the refrigeration system when a chiller fails by providing a condensation thermal management solution with dual heat exchange media.

[0006] In a first aspect, an embodiment of the present application provides a double-tube condenser, which is applied to a refrigerator refrigeration system. The double-tube condenser includes:

[0007] An inner casing for circulating refrigerant;

[0008] An outer casing is used for allowing a heat exchange medium to flow through, and the heat exchange medium is cooling water and / or air;

[0009] The inlet end and the outlet end of the outer sleeve are connected to the water outlet and the water inlet of the water tank of a chiller through a water supply pipeline and a return water pipeline respectively, and the water supply pipeline and the return water pipeline are also connected to an air source device through a first air pipeline and a second air pipeline respectively;

[0010] The heat exchange medium of the outer casing is switched by controlling the on / off of the first air pipeline, the second air pipeline, the water supply pipeline and / or the return water pipeline.

[0011] Based on the above structure, the shell and tube condenser of the embodiment of the present application supports dual heat exchange media of cooling water and air. When a failure occurs in the chiller or the air source device, it can be flexibly switched, thereby improving the stability of the shell and tube condenser.

[0012] In some embodiments, the outer wall surface of the inner sleeve is configured as a corrugated tube structure, and a thermal insulation layer is disposed outside the outer sleeve.

[0013] Based on the above structure, by setting the inner sleeve as a bellows structure, when the sleeve-type condenser of the embodiment of the present application uses cooling water as the heat exchange medium, the heat exchange capacity of the condenser can be met after reducing the water flow rate, thereby reducing the power of the water pump in the refrigeration system and achieving the effect of reducing the manufacturing cost of the system; when air is used as the heat exchange medium, the bellows structure can cause strong disturbances in the compressed air, effectively enhancing the heat exchange capacity of the compressed air.

[0014] In some embodiments, the chiller further comprises:

[0015] A compressor, a condenser, a throttle and an evaporator are connected in sequence by pipelines. The evaporator is arranged inside the water tank. Cooling water is stored in the water tank. A water pump is arranged at the water outlet of the water tank connected to the water supply pipeline. The water pump is electrically connected to a controller.

[0016] In some embodiments, the air source device includes the first air pipeline and the second air pipeline, wherein:

[0017] The first air pipeline is connected to the water supply pipeline, and the first air pipeline is provided with an outdoor air inlet and an indoor air inlet, the outdoor air inlet is connected to the outdoor air, and the indoor air inlet is connected to the indoor air;

[0018] The second air pipeline is connected to the return water pipeline, and the second air pipeline is provided with an outdoor air outlet and an indoor air outlet;

[0019] The first air pipeline is provided with a compressor and an air tank, the air inlet of the compressor is connected to the outdoor air inlet and the indoor air inlet, the air tank is arranged at the air outlet of the compressor, and the air outlet of the air tank is connected to the water supply pipeline.

[0020] In some embodiments, the air source device further comprises:

[0021] A first outdoor air stop valve, arranged at the outdoor air inlet;

[0022] A second outdoor air stop valve is arranged at the outdoor air outlet;

[0023] A first indoor air stop valve, arranged at the indoor air inlet;

[0024] A second indoor air stop valve is arranged at the indoor air outlet;

[0025] A gas supply pipeline stop valve is arranged at the gas outlet of the gas tank;

[0026] The exhaust pipeline stop valve is arranged at the connecting end of the second air pipeline and the return water pipeline.

[0027] In some embodiments, a water supply stop valve is provided on the water supply pipeline, and the water supply stop valve is located between the water pump and the first air pipeline. A return water stop valve is provided on the return water pipeline, and the return water stop valve is located between the exhaust second air pipeline and the water inlet of the water tank.

[0028] Based on the above structure, when the chiller is running, the air supply pipeline stop valve and the exhaust pipeline stop valve are closed, and the water supply stop valve, the return water stop valve and the water pump are opened. At this time, the cooling water in the water tank is supplied to the shell-and-tube condenser through the water pump, and the cooling water in the outer shell of the shell-and-tube condenser exchanges heat with the refrigerant in the inner shell. When the air source device is running, the chiller, the water pump, the compressor and the water supply stop valve are closed, and the compressor, the air supply pipeline stop valve and the exhaust pipeline stop valve are opened. When the pressure value in the gas tank reaches the set value, the compressor is automatically closed; at this time, the compressed air is output by the gas tank to discharge the residual water in the pipeline back to the water and then close the return water stop valve. Subsequently, the compressed air is transported to the shell-and-tube condenser through the first air pipeline and discharged through the second air pipeline.

[0029] In a second aspect, an embodiment of the present application provides a refrigerator refrigeration system, a refrigeration circuit on the condensation side of the refrigerator, the refrigeration circuit comprising a refrigeration compressor, a water-cooled condenser, a dryer, a refrigeration throttle and a refrigeration evaporator connected in sequence by pipelines, the water-cooled condenser adopts the shell-and-tube condenser described in the first aspect above, and the refrigerator refrigeration system also includes:

[0030] The controller is pre-configured with an outdoor ambient temperature threshold t w , a water supply temperature threshold t s , water supply temperature setting value T s and a difference threshold t to control the start and stop of the chiller and the compressor;

[0031] A water supply temperature detector is arranged inside the water tank and electrically connected to the controller, and is used to detect a real-time water temperature value T of the cooling water inside the water tank and send it to the controller;

[0032] An outdoor ambient temperature detector is provided on the chiller and electrically connected to the controller. The outdoor ambient temperature detector is used to detect the outdoor ambient temperature value T of the outdoor space where the chiller is located. W and sent to the controller;

[0033] An indoor environment temperature detector is arranged outside the refrigerator and electrically connected to the controller. The indoor environment temperature detector is used to detect the indoor environment temperature value T of the indoor space where the refrigerator is located. n And sent to the controller, the water supply temperature setting value T s Based on the indoor environment temperature value T n and the difference threshold t are calculated, and the controller is based on the water supply temperature setting value T s and the water supply temperature threshold t s Calculate the lower limit of water supply temperature T a and the upper limit of water supply temperature T b .

[0034] In a third aspect, an embodiment of the present application provides a refrigerator refrigeration system control method. Based on the refrigerator refrigeration system of the second aspect above, the method includes:

[0035] The detection data acquisition step is to obtain the outdoor ambient temperature value T by detecting the outdoor ambient temperature detector. W and sent to the controller;

[0036] The heat exchange medium switching control step is performed by the controller according to the outdoor environment temperature threshold t w Control the start, stop and / or on / off of the chiller and air source device.

[0037] In some embodiments, the heat exchange medium switching control step further includes:

[0038] Cooling water heat exchange step, when the outdoor environment temperature value T W > the outdoor ambient temperature threshold t w When the controller opens and connects the water supply circuit of the chiller, and cuts off the air supply circuit of the air source device; specifically, the air supply circuit is cut off by closing the air supply pipeline stop valve and the exhaust pipeline stop valve, and the water supply circuit is connected by opening the water supply stop valve and the return water stop valve, so as to provide cooling water for the shell-and-tube condenser through the chiller.

[0039] In the air heat exchange step, when the chiller fails or the outdoor environment temperature is T W ≤ the outdoor ambient temperature threshold t wWhen the controller closes and cuts off the water supply circuit of the chiller, the air supply circuit of the air source device is connected.

[0040] In some embodiments, the air heat exchange step further comprises:

[0041] Cooling water supply cut-off step, the controller closes the water supply stop valve to cut off the cooling water source of the cooling water of the chiller, and opens the air supply pipeline stop valve and the exhaust pipeline stop valve to connect the air supply circuit of the air source device, and the air source device outputs compressed air to the shell-and-tube condenser through the compressor and the air tank of the first air pipeline to provide an air source for the shell-and-tube condenser;

[0042] a cooling water draining step, after the cooling water supply cut-off step is completed, the return water shut-off valve is closed with a delay to cut off the water supply circuit of the chiller, so as to drain the cooling water in the water supply circuit into the water tank through compressed air;

[0043] The air heat exchange start-up step continuously outputs compressed air to the shell-and-tube condenser through the compressor and the air tank, and the compressed air absorbs heat in the outer shell of the shell-and-tube condenser and is discharged through the second air pipeline.

[0044] In some embodiments, the cooling water heat exchange step further comprises:

[0045] The water supply detection data acquisition step, the controller according to the indoor environment temperature value T n The water supply temperature setting value T is calculated by the difference threshold t s Then, combined with the water supply temperature threshold t s Calculate the lower limit of water supply temperature T a and the upper limit of water supply temperature T b ;

[0046] The compressor start and stop control step, the controller is based on the real-time water temperature value T and the lower limit value T of the water supply temperature a , water supply temperature upper limit T b Make a judgment:

[0047] When the real-time water temperature value T≤T a When the controller controls the compressor to shut down;

[0048] When the real-time water temperature value T>T b When the compressor starts, the controller controls the compressor to start.

[0049] Based on the above steps, the embodiment of the present application controls the cooling water temperature by controlling the start and stop of the compressor of the chiller, thereby achieving efficient water cooling and heat dissipation of the refrigerator refrigeration system, while avoiding frequent start and stop of the compressor of the chiller, effectively improving the overall energy efficiency level of the system.

[0050] In a fourth aspect, an embodiment of the present application provides a cascade refrigerator refrigeration system, comprising a plurality of refrigerator refrigeration systems as described in the second aspect above, wherein the shell-and-tube condenser of each refrigerator refrigeration system is connected in parallel to the water supply pipeline and the return pipeline, and is controlled by the refrigerator refrigeration system control method as described in the third aspect above.

[0051] Compared with the related art, the shell-and-tube condenser, refrigerator refrigeration system, control method and cascade refrigerator refrigeration system provided in the embodiments of the present application can adopt different heat dissipation media (water and air) according to different outdoor ambient temperatures, so as to realize efficient thermal management of condensation heat dissipation of the refrigerator in different seasons throughout the year, solve the problem of centralized heat dissipation of multiple low-temperature refrigerator condensers, and at the same time solve the problem of insufficient heat dissipation capacity of the refrigerator condenser when the chiller fails or is under maintenance.

[0052] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0054] Figure 1 is a structural schematic diagram of a shell-and-tube condenser according to an embodiment of the present application;

[0055] Figure 2 is a schematic diagram of the water cooling heat exchange principle of the refrigerator refrigeration system according to an embodiment of the present application;

[0056] Figure 3 is a schematic diagram of the air heat exchange principle of a refrigerator refrigeration system according to an embodiment of the present application;

[0057] Figure 4 is a schematic diagram of the indoor air supply / exhaust principle of a refrigerator refrigeration system according to an embodiment of the present application;

[0058] Figure 5 is a schematic diagram of the outdoor air supply / exhaust principle of a refrigerator refrigeration system according to an embodiment of the present application;

[0059] Figure 6 is a flow chart of a refrigerator refrigeration system control method according to an embodiment of the present application;

[0060] Figure 7 This is a flowchart of step S21 of a refrigerator refrigeration system control method according to an embodiment of the present application;

[0061] Figure 8 This is a flowchart of step S212 of a method for controlling a refrigerator refrigeration system according to an embodiment of the present application;

[0062] Fig. 9 It is a flowchart of step S22 of the refrigerator refrigeration system control method according to an embodiment of the present application.

[0063] In the figure:

[0064] 1. Shell-and-tube condenser; 101. Inner shell; 102. Outer shell; 2. Water supply pipeline;

[0065] 3. Return water pipeline; 4. First air pipeline; 5. Second air pipeline;

[0066] 6. Chiller; 601. Water tank; 602. Compressor; 603. Water pump;

[0067] 7. Compressor; 8. Gas tank;

[0068] 9. First outdoor air stop valve; 10. Second outdoor air stop valve;

[0069] 11. First indoor air shut-off valve; 12. Second indoor air shut-off valve;

[0070] 13. Stop valve for gas supply pipeline; 14. Stop valve for exhaust pipeline;

[0071] 201, water supply stop valve; 301, return water stop valve;

[0072] 15. Water supply temperature detector; 16. Outdoor environment temperature detector;

[0073] 17. Indoor ambient temperature detector;

[0074] A. Outdoor air inlet; B. Indoor air inlet;

[0075] C. Outdoor air outlet; D. Indoor air outlet. DETAILED DESCRIPTION

[0076] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0077] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0078] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0079] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0080] Heat exchange medium is the working fluid used to transfer heat energy and produce a refrigeration effect in refrigeration and air conditioning systems. Specific embodiment one:

[0082] The present application embodiment provides a shell and tube condenser applied to a refrigerator refrigeration system, referring to Figure 1 As shown, the shell-and-tube condenser 1 comprises: an inner shell-and-tube 101 and an outer shell-and-tube 102. The inner shell-and-tube 101 is used for circulation of refrigerant; the outer shell-and-tube 102 is used for circulation of heat exchange medium, which is cooling water and / or air.

[0083] refer to Figures 2 to 5 As shown, the inlet end and the outlet end of the outer casing 102 are connected to the water outlet and the water inlet of the water tank 601 of the chiller 6 through the water supply pipeline 2 and the return water pipeline 3 respectively. The water supply pipeline 2 and the return water pipeline 3 are also connected to the air source device through the first air pipeline 4 and the second air pipeline 5 respectively, so that the heat exchange medium of the outer casing 102 is switched by controlling the on and off of the first air pipeline 4, the second air pipeline 5, the water supply pipeline 2 and / or the return water pipeline 3.

[0084] Based on the above structure, the shell and tube condenser 1 of the embodiment of the present application supports dual heat exchange media of cooling water and air. When a failure occurs in the chiller 6 or the air source device, it can be flexibly switched, thereby improving the stability of the shell and tube condenser 1.

[0085] In some embodiments, such as Figure 1 As shown in the figure, the outer wall surface of the inner sleeve 101 is arranged as a bellows structure, and the outer sleeve 102 is arranged with a heat-insulating layer.

[0086] Based on the above structure, by setting the inner sleeve 101 as a bellows structure, when the sleeve-type condenser 1 of the embodiment of the present application uses cooling water as the heat exchange medium, the heat exchange capacity of the condenser can be met after reducing the water flow rate, thereby reducing the power of the water pump 603 in the refrigeration system and achieving the effect of reducing the manufacturing cost of the system; when air is used as the heat exchange medium, the bellows structure can cause strong disturbances in the compressed air, effectively enhancing the heat exchange capacity of the compressed air.

[0087] The chiller 6 in the above embodiment specifically includes: a compressor 602, a condenser, a throttle and an evaporator connected in sequence by pipelines, the evaporator is arranged inside a water tank 601, cooling water is stored in the water tank 601, a water pump 603 is arranged at a water outlet of the water tank 601 connected to the water supply pipeline 2, and the water pump 603 is electrically connected to a controller. Although the compressor 602, the condenser, the throttle, the evaporator and other devices are not specifically shown in the figure, the aforementioned devices are all components of the chiller known to those skilled in the art, and this part is not the main invention of the present application, and is simply illustrated here without further description.

[0088] The air source device in the above embodiment includes a first air pipeline 4 and a second air pipeline 5. The first air pipeline 4 is connected to the water supply pipeline 2. The first air pipeline 4 is provided with an outdoor air inlet A and an indoor air inlet B. The outdoor air inlet A is connected to the outdoor air, and the indoor air inlet B is connected to the indoor air; the second air pipeline 5 is connected to the return water pipeline 3, and the second air pipeline 5 is provided with an outdoor air outlet C and an indoor air outlet D; the first air pipeline 4 is provided with a compressor 7 and an air tank 8, the air inlet of the compressor 7 is connected to the outdoor air inlet A and the indoor air inlet B, the air tank 8 is provided at the air outlet of the compressor 7, and the air outlet of the air tank 8 is connected to the water supply pipeline 2. Among them, a water supply stop valve 201 is provided on the water supply pipeline 2, and the water supply stop valve 201 is located between the water pump 603 and the first air pipeline 4. A return water stop valve 301 is provided on the return water pipeline 3, and the return water stop valve 301 is located between the second air pipeline 5 and the water inlet of the water tank 601.

[0089] In addition, in order to facilitate the control of the connection or disconnection between the first air pipeline 4 and the second air pipeline 5, the air source device also includes a plurality of stop valves, which are as follows: a first outdoor air stop valve 9 is provided at the outdoor air inlet A, a second outdoor air stop valve 10 is provided at the outdoor air outlet C, a first indoor air stop valve 11 is provided at the indoor air inlet B, a second indoor air stop valve 12 is provided at the indoor air outlet D, an air supply pipeline stop valve 13 is provided at the air outlet of the gas tank 8, and an exhaust pipeline stop valve 14 is provided at the connecting end of the second air pipeline 5 and the return water pipeline 3. Figures 2 to 5 As shown, the indoor air outlet D of the embodiment of the present application is also connected to an air filter through a pipeline, and the air filter is connected to a diffuser or an indoor air supply system.

[0090] Based on the above structure, Figure 3 As shown, the first outdoor air stop valve 9, the first indoor air stop valve 11, the second outdoor air stop valve 10 and the second indoor air stop valve 12 can be opened at the same time; when the first outdoor air stop valve 9 is opened and the first indoor air stop valve 11 is closed, outdoor air can be used as a heat exchange medium, such as Figure 5 As shown; on the contrary, indoor air can be used as the heat exchange medium, such as Figure 4 When the second outdoor air stop valve 10 is closed and the second indoor air stop valve 12 is opened, the heat exchanged air can be used as auxiliary heating and then filtered through an air filter and discharged into the room through a diffuser or an indoor air supply system, such as Figure 4 As shown, to reduce the indoor heating load, suitable for winter; on the contrary, the heat exchanged air is directly discharged to the outside to avoid increasing the load of the indoor refrigerator air conditioner, such as Figure 5 As shown, it can be used in summer or transitional seasons.

[0091] Optionally, the first outdoor air stop valve 9, the second outdoor air stop valve 10, the first indoor air stop valve 11, the second indoor air stop valve 12, the air supply pipeline stop valve 13, the exhaust pipeline stop valve 14, the water supply stop valve 201 and the return water stop valve 301 of the embodiment of the present application are all electric stop valves, which are respectively connected to the controller through electrical connection to realize their on-off control, and can also be set as manual stop valves for manual adjustment.

[0092] Based on the above structure, when the chiller 6 is running, Figure 2 As shown, the air supply pipeline stop valve 13 and the exhaust pipeline stop valve 14 are closed, and the water supply stop valve 201, the return water stop valve 301 and the water pump 603 are opened. At this time, the cooling water in the water tank 601 is supplied to the shell-and-tube condenser 1 through the water pump 603, and the cooling water in the outer shell 102 of the shell-and-tube condenser 1 exchanges heat with the refrigerant in the inner shell 101. When the air source device is operated, as shown in FIG. Figure 3-Figure 5 As shown, the chiller 6, the water pump 603, the compressor 602 and the water supply stop valve 201 are turned off, and the compressor 7, the air supply pipeline stop valve 13 and the exhaust pipeline stop valve 14 are turned on. When the pressure value in the gas tank 8 reaches the set value, the compressor 7 is automatically turned off; at this time, the gas tank 8 is used to output compressed air to discharge the residual water in the pipeline back to the water, and then the return water stop valve 301 is closed. Subsequently, the compressed air is transported to the shell-and-tube condenser 1 through the first air pipeline 4 and discharged through the second air pipeline 5.

[0093] Therefore, the shell and tube condenser 1 of the embodiment of the present application supports dual heat exchange media of cooling water and air, improves the stability of the shell and tube condenser 1, achieves the effect of reducing the manufacturing cost of the system, and effectively enhances the heat exchange capacity of compressed air. Specific embodiment 2:

[0095] The embodiment of the present application provides a refrigerator refrigeration system, a refrigeration circuit on the condensation side of the refrigerator, the refrigeration circuit includes a refrigeration compressor, a water-cooled condenser, a dryer, a refrigeration throttle and a refrigeration evaporator connected in sequence by pipelines, the water-cooled condenser adopts the shell-and-tube condenser 1 of the first aspect above, and the refrigerator refrigeration system also includes:

[0096] The controller is pre-configured with an outdoor ambient temperature threshold t w , water supply temperature threshold t s , water supply temperature setting value T s and a difference threshold t to control the start and stop of the chiller and the compressor;

[0097] The water supply temperature detector 15 is disposed inside the water tank 601 and electrically connected to the controller. The water supply temperature detector 15 is used to detect the real-time water temperature value T of the cooling water inside the water tank 601 and send it to the controller;

[0098] The outdoor environment temperature detector 16 is arranged on the chiller 6 and is electrically connected to the controller. The outdoor environment temperature detector 16 is used to detect the outdoor environment temperature value T of the outdoor space where the chiller 6 is located. W And send it to the controller;

[0099] The indoor environment temperature detector 17 is arranged outside the refrigerator and electrically connected to the controller. The indoor environment temperature detector 17 is used to detect the ambient temperature value T of the indoor space where the refrigerator is located. n And send it to the controller;

[0100] Among them, the water supply temperature setting value T s Based on the indoor ambient temperature value T n And the difference threshold t is calculated, T s =T n +t; the controller is based on the water supply temperature setting value T s and water supply temperature threshold t s Calculate the lower limit of water supply temperature T a and the upper limit of water supply temperature T b , T a =T s -t s , T b =T s +t s .

[0101] It should be noted that the design operating condition of the evaporation temperature of the refrigeration evaporator is set to ≥10℃ to ensure that the refrigeration system operates at a higher energy efficiency level. Specific embodiment three:

[0103] The present application embodiment also provides a refrigerator refrigeration system control method, based on the refrigerator refrigeration system provided in the above specific embodiment 2, referring to Figure 6-Figure 9 As shown, the method comprises the following steps:

[0104] Detection data acquisition step S1, the outdoor environment temperature value T is detected by the outdoor environment temperature detector 16 W And send it to the controller;

[0105] Heat exchange medium switching control step S2, through the controller according to the outdoor environment temperature threshold t w Control the start and stop and / or on and off of the chiller 6 and the air source device. For example, but not limitation, the outdoor ambient temperature threshold t w The temperature is set to 22°C. The heat exchange medium switching control step S2 further includes:

[0106] Cooling water heat exchange step S21, when the outdoor environment temperature value T W >Outdoor ambient temperature threshold t wWhen the controller opens and connects the water supply circuit of the chiller 6, and cuts off the air supply circuit of the air source device; specifically, the chiller 6 is turned on or off by controlling the on and off of the power supply of the chiller 6, the air supply circuit is cut off by closing the air supply pipeline stop valve 13 and the exhaust pipeline stop valve 14, and the water supply circuit is connected by opening the water supply stop valve 201 and the return water stop valve 301, so as to provide cooling water for the shell-and-tube condenser 1 through the chiller 6.

[0107] Air heat exchange step S22, when the chiller 6 fails or the outdoor ambient temperature is T W ≤Outdoor ambient temperature threshold t w When the controller closes and cuts off the water supply circuit of the chiller 6, the air supply circuit of the air source device is connected.

[0108] refer to Figure 7 As shown, the cooling water heat exchange step S21 further includes:

[0109] In step S211, the controller obtains water supply detection data according to the difference threshold value t and the indoor ambient temperature value T measured by the indoor ambient temperature detector 17. n Calculate the water supply temperature setting value T s After that, combined with the water supply temperature threshold t s Calculate the lower limit of water supply temperature T a and the upper limit of water supply temperature T b ;

[0110] In step S212, the controller starts and stops the compressor according to the real-time water temperature value T measured by the water supply temperature detector 15 and the lower limit value T of the water supply temperature. a and the upper limit of water supply temperature T b Make a judgment, when the real-time water temperature value T≤T a When the real-time water temperature value T>T b , the controller controls the compressor 602 to start.

[0111] Assume that the outdoor ambient temperature threshold is t w =22℃, difference threshold t=2℃, water supply temperature threshold t s =2, the indoor ambient temperature value T detected by the indoor ambient temperature detector 17 n =25°C, then based on the calculation formula in the above embodiment, the controller calculates the cooling water supply temperature setting value T s =T n +t=27℃, and then get the lower limit of water supply temperature T a =25℃, upper limit of water supply temperature T b =29℃.

[0112] like Figure 8As shown, in the compressor start-stop control step S212, when the real-time water temperature value T> the water supply temperature upper limit value T b (T b =29°C), the chiller refrigeration system is turned on, that is, the compressor 602 is turned on, otherwise, the lower limit value of the water supply temperature T is further determined. a , when the real-time water temperature value T≤the lower limit of the water supply temperature T a (T a =25°C), turn off the chiller refrigeration system, that is, turn off the compressor 602. Otherwise, return to the previous step to determine whether the real-time water temperature value T is greater than the upper limit value T of the water supply temperature. b .

[0113] Based on the above steps, the embodiment of the present application controls the cooling water temperature by controlling the start and stop of the compressor 602 of the chiller 6, thereby achieving efficient water cooling and heat dissipation of the refrigerator refrigeration system, while avoiding frequent start and stop of the compressor 602 of the chiller 6, effectively improving the overall energy efficiency level of the system.

[0114] refer to Fig. 9 As shown, the air heat exchange step S22 further includes:

[0115] In the cooling water supply cut-off step S221, the controller closes the water supply stop valve 201 to cut off the cooling water source of the cooling water of the chiller 6, and opens the air supply pipeline stop valve 13 and the exhaust pipeline stop valve 14 to connect the air supply circuit of the air source device. The air source device outputs compressed air to the shell-and-tube condenser 1 through the compressor 7 and the air tank 8 of the first air pipeline 4 to provide an air source for the shell-and-tube condenser 1;

[0116] Cooling water emptying step S222: After the cooling water supply cut-off step S221 is completed, the return water stop valve 301 is closed with a delay to cut off the water supply circuit of the chiller 6, so as to discharge the cooling water in the water supply circuit into the water tank 601 through compressed air;

[0117] In the air heat exchange starting step S223 , the compressed air is continuously output to the shell-and-tube condenser 1 through the compressor 7 and the air tank 8 . The compressed air absorbs heat in the outer shell 102 of the shell-and-tube condenser 1 and is discharged through the second air pipeline 5 .

[0118] Based on the above steps, the embodiment of the present application realizes a seamless connection from cooling water heat exchange to air heat exchange. When the chiller 6 fails, it can flexibly switch to air heat exchange, which not only solves the heat dissipation problem caused by the failure of the chiller, but also realizes efficient thermal management of condensation heat dissipation of the refrigerator in different seasons throughout the year.

[0119] It should be noted that the steps shown in the above process or the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here. Specific embodiment four:

[0121] The refrigerator refrigeration system provided in the above specific embodiment 2 can be integrated with each other or relatively independent. In the embodiment of the present application, a cascade refrigerator refrigeration system is provided in which multiple refrigerator refrigeration systems are integrated with each other. The shell-and-tube condenser 1 of each refrigerator refrigeration system is connected in parallel to the water supply pipeline 2 and the return water pipeline 3 by setting a water collector and a water distributor, and is controlled by the refrigerator refrigeration system control method provided in the above specific embodiment 3.

[0122] In summary, the present application realizes condensation heat management when multiple refrigerators are operated in a centralized manner, effectively improves the overall energy efficiency level of the refrigerators and the refrigeration effect of the refrigerators themselves, and reduces the operating costs and manufacturing costs of the refrigerators. The shell-and-tube condenser 1 of the present application and the refrigerator refrigeration system based on the shell-and-tube condenser 1 support dual heat exchange media of cooling water and air, and the switching control of the two heat exchange media is convenient, which can effectively reduce the equipment cost. When a failure occurs in the chiller 6 or the air source device, it can be flexibly switched, thereby improving the stability of the overall refrigerator refrigeration system and its cascade refrigerator refrigeration system.

[0123] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0124] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A shell and tube condenser, applied to a refrigerator refrigeration system, characterized in that: The double-tube condenser comprises: An inner casing for circulating refrigerant; An outer casing is used for allowing a heat exchange medium to flow through, and the heat exchange medium is cooling water and / or air; The inlet end and the outlet end of the outer sleeve are connected to the water outlet and the water inlet of a water tank of a chiller through a water supply pipeline and a return water pipeline, respectively. The water supply pipeline and the return water pipeline are also connected to an air source device through a first air pipeline and a second air pipeline, respectively. The air source device includes the first air pipeline and the second air pipeline, wherein the first air pipeline is connected to the water supply pipeline, the first air pipeline is provided with an outdoor air inlet and an indoor air inlet, the first air pipeline is provided with a compressor and an air tank, the air inlet of the compressor is connected to the outdoor air inlet and the indoor air inlet, and the air tank is arranged on the compressor The air outlet of the air machine, the air outlet of the air tank is connected to the water supply pipeline; the second air pipeline is connected to the return water pipeline, and the second air pipeline is provided with an outdoor air outlet and an indoor air outlet; the first outdoor air stop valve is arranged at the outdoor air inlet; the second outdoor air stop valve is arranged at the outdoor air outlet; the first indoor air stop valve is arranged at the indoor air inlet; the second indoor air stop valve is arranged at the indoor air outlet; the air supply pipeline stop valve is arranged at the air outlet of the air tank; the exhaust pipeline stop valve is arranged at the connecting end of the second air pipeline and the return water pipeline; The heat exchange medium of the outer sleeve is switched by controlling the on / off of the first air pipeline, the second air pipeline, the water supply pipeline and / or the return water pipeline; the outer wall surface of the inner sleeve is set as a corrugated tube structure, and an insulation layer is set outside the outer sleeve.

2. The double-tube condenser according to claim 1, characterized in that: The chiller also includes: A compressor, a condenser, a throttle and an evaporator are connected in sequence by pipelines. The evaporator is arranged inside the water tank. Cooling water is stored in the water tank. A water pump is arranged at the water outlet of the water tank connected to the water supply pipeline. The water pump is electrically connected to a controller.

3. The double-tube condenser according to claim 2, characterized in that: The water supply pipeline is provided with a water supply stop valve, and the water supply stop valve is located between the water pump and the first air pipeline. The return water pipeline is provided with a return water stop valve, and the return water stop valve is located between the second air pipeline and the water inlet of the water tank.

4. A refrigerator refrigeration system, a refrigeration circuit on the condensation side of the refrigerator, the refrigeration circuit comprising a refrigeration compressor, a water-cooled condenser, a dryer, a refrigeration throttle and a refrigeration evaporator connected in sequence by pipelines, the water-cooled condenser adopts a shell-and-tube condenser as claimed in any one of claims 1 to 3, characterized in that: The refrigerator refrigeration system also includes: The controller is pre-configured with an outdoor ambient temperature threshold t w , a water supply temperature threshold t s , water supply temperature setting value T s and a difference threshold t to control the start and stop of the chiller and the compressor; A water supply temperature detector is arranged inside the water tank and electrically connected to the controller, and is used to detect a real-time water temperature value T of the cooling water inside the water tank and send it to the controller; An outdoor ambient temperature detector is provided on the chiller and electrically connected to the controller. The outdoor ambient temperature detector is used to detect the outdoor ambient temperature value T of the outdoor space where the chiller is located. W and sent to the controller; An indoor environment temperature detector is arranged outside the refrigerator and electrically connected to the controller. The indoor environment temperature detector is used to detect the indoor environment temperature value T of the indoor space where the refrigerator is located. n And sent to the controller, the water supply temperature setting value T s Based on the indoor environment temperature value T n and the difference threshold t are calculated, and the controller is based on the water supply temperature setting value T s and the water supply temperature threshold t s Calculate the lower limit of water supply temperature T a and the upper limit of water supply temperature T b .

5. A refrigerator refrigeration system control method, based on the refrigerator refrigeration system according to claim 4, characterized in that: include: The detection data acquisition step is to obtain the outdoor environment temperature value T through the outdoor environment temperature detector. W and sent to the controller; The heat exchange medium switching control step is performed by the controller according to the outdoor environment temperature threshold t w Control the start, stop and / or on / off of the chiller and air source device.

6. The refrigerator refrigeration system control method according to claim 5, characterized in that: The heat exchange medium switching control step further includes: Cooling water heat exchange step, when the outdoor environment temperature value T W > the outdoor ambient temperature threshold t w When the controller opens and connects the water supply circuit of the chiller, the air supply circuit of the air source device is cut off; In the air heat exchange step, when the chiller fails or the outdoor environment temperature is T W ≤ the outdoor ambient temperature threshold t w When the controller closes and cuts off the water supply circuit of the chiller, the air supply circuit of the air source device is connected.

7. The refrigerator refrigeration system control method according to claim 6, characterized in that: The air heat exchange step further comprises: Cooling water supply cut-off step, the controller closes the water supply stop valve to cut off the cooling water source of the cooling water of the chiller, and opens the air supply pipeline stop valve and the exhaust pipeline stop valve to connect the air supply circuit of the air source device, and the air source device outputs compressed air to the shell-and-tube condenser through the compressor and the air tank of the first air pipeline to provide an air source for the shell-and-tube condenser; a cooling water draining step, after the cooling water supply cut-off step is completed, the return water shut-off valve is closed with a delay to cut off the water supply circuit of the chiller, so as to drain the cooling water in the water supply circuit into the water tank through compressed air; The air heat exchange start-up step continuously outputs compressed air to the shell-and-tube condenser through the compressor and the air tank, and the compressed air absorbs heat in the outer shell of the shell-and-tube condenser and is discharged through the second air pipeline.

8. The refrigerator refrigeration system control method according to claim 6 or 7, characterized in that: The cooling water heat exchange step further comprises: The water supply detection data acquisition step, the controller according to the indoor environment temperature value T n The water supply temperature setting value T is calculated by the difference threshold t s Then, combined with the water supply temperature threshold t s Calculate the lower limit of water supply temperature T a and the upper limit of water supply temperature T b ; The compressor start and stop control step, the controller is based on the real-time water temperature value T and the lower limit value T of the water supply temperature a , water supply temperature upper limit T b Make a judgment: When the real-time water temperature value T≤T a When the controller controls the compressor to shut down; When the real-time water temperature value T>T b When the compressor starts, the controller controls the compressor to start.

9. A cascade freezer refrigeration system, characterized in that: It comprises a plurality of freezer refrigeration systems as claimed in claim 4, wherein the shell-and-tube condensers of each freezer refrigeration system are connected in parallel to the water supply pipeline and the return pipeline, and are controlled by the freezer refrigeration system control method as claimed in any one of claims 5-8.

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