Cascade high and low temperature system
By designing a composite high and low temperature system, using components such as primary and secondary compressors and evaporators to form multiple cooling circuits, and combining heaters to achieve precise temperature control, it solves the problem that low and high temperatures cannot be achieved simultaneously in the existing technology. The problem of achieving a wider temperature range and more accurate temperature control.
Patent Information
- Application Number
- CN202420948400.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-06
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-06
AI Technical Summary
The existing two-stage composite refrigeration circulation system cannot reach low and high temperatures at the same time, and the refrigeration range is limited to around -80℃, and the temperature cannot be controlled independently.
A composite high and low temperature system is designed, including a primary compressor, a secondary compressor, a first evaporator and a second evaporator, through a condenser, an expansion valve, a liquid reservoir, a dryer, a filter, and an oil divider , circulation pump, heater and other components form local and ultra-low temperature cooling circuits, and achieve precise temperature control through the heater.
The temperature range of -90℃ to 250℃ is achieved. Through the use of the heater, the circulating liquid can be kept at a relatively accurate temperature value, with a large temperature range and accurate temperature control.
Smart Images
Figure CN222480811U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of refrigeration technology, and in particular to a cascade high and low temperature system. Background Art
[0002] The cascade refrigeration cycle divides the large total temperature difference into two or more sections, selects the appropriate refrigerant cycle according to the temperature zone of each section, and then stacks them up, using the refrigeration capacity of the high-temperature stage to bear the condensation load of the low-temperature stage, thereby obtaining a lower refrigeration temperature. Cascade refrigeration is a special form of vapor compression refrigeration, usually consisting of two or three independent vapor compression refrigeration cycles with different working temperature zones.
[0003] The existing two-stage cascade refrigeration cycle system has a refrigeration range of about -80°C and cannot achieve high temperatures at the same time. Utility Model Content
[0004] The present disclosure provides a cascade high and low temperature system to solve one of the technical problems recognized by the inventor.
[0005] The present disclosure provides a cascade high and low temperature system, comprising: a primary compressor, a secondary compressor, a first evaporator and a second evaporator, the primary compressor being connected to a first branch of the first evaporator, a condenser being arranged between the output end of the primary compressor and the first evaporator, one end of the second branch of the first evaporator being connected to the output end of the secondary compressor, the other end of the second branch of the first evaporator being connected to one end of the first branch of the second evaporator, the other end of the first branch of the second evaporator being connected to the input end of the secondary compressor, and the output end of the second branch of the second evaporator being connected to a heater.
[0006] Preferably, a first expansion valve is provided between the condenser and the first evaporator, and a second expansion valve is provided between the first evaporator and the second evaporator.
[0007] Preferably, a liquid storage tank is provided between the condenser and the first expansion valve, and a dryer is provided between the liquid storage tank and the first expansion valve.
[0008] Preferably, a filter is provided between the first evaporator and the second expansion valve.
[0009] Preferably, an oil separator is provided at the output end of the secondary compressor, one end of the oil separator is connected to the input end of the secondary compressor, and the other end of the oil separator is connected to the second branch of the first evaporator.
[0010] Preferably, the input end of the second branch of the evaporator is connected to a circulation pump, and the circulation pump is connected to a liquid storage tank.
[0011] Preferably, a gas tank is connected between the secondary compressor and the first evaporator via a pipeline branch, and a solenoid valve is provided on the pipeline branch.
[0012] Preferably, a first viewing window is provided between the liquid storage tank and the dryer.
[0013] Preferably, a second viewing window is provided between the oil separator and the secondary compressor.
[0014] Preferably, the liquid storage tank, the heater and the circulating pump are all provided with a liquid discharge port.
[0015] The beneficial effects of the present disclosure are mainly that: the present invention can achieve a temperature range of -90°C to 250°C by using a two-stage refrigeration circulation system in conjunction with a heater, and the circulating liquid can be kept constant at a relatively precise temperature value through the heater, having the effects of a large temperature range and precise temperature control.
[0016] It should be understood that both the foregoing general description and the following specific embodiments are for the purpose of example and illustration and do not necessarily limit the present disclosure. The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate the subject matter of the present disclosure. At the same time, the specification and the drawings are used to explain the principles of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the specific embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 It is a schematic diagram of the system principle structure of an embodiment of the present disclosure;
[0019] Icons: 1-first stage compressor; 2-second stage compressor; 3-first evaporator; 4-second evaporator; 5-condenser; 6-liquid storage tank; 7-dryer; 8-first expansion valve; 9-filter; 10-second expansion valve; 11-oil separator; 12-solenoid valve; 13-liquid storage tank; 14-heater; 15-circulating pump; 16-gas tank; 17-first viewing window; 18-second viewing window; 19-drain port. DETAILED DESCRIPTION
[0020] The technical solution of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments.
[0021] Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present disclosure.
[0022] In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0023] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.
[0024] Example
[0025] like Figure 1 As shown, this embodiment provides a cascade high and low temperature system, including a primary compressor 1, a secondary compressor 2, a first evaporator 3 and a second evaporator 4, the primary compressor 1 is connected to the first branch of the first evaporator 3, a condenser 5 is arranged between the output end of the primary compressor 1 and the first evaporator 3, a local refrigeration circuit is formed by the primary compressor 1, the condenser 5 and the first evaporator 3, in this embodiment, the first evaporator 3 is a condensing evaporator; one end of the second branch of the first evaporator 3 is connected to the output end of the secondary compressor 2, the other end of the second branch of the first evaporator 3 is connected to one end of the first branch of the second evaporator 4, the other end of the first branch of the second evaporator 4 is connected to the input end of the secondary compressor 2, the first evaporator 3 is used as the condenser 5 of the secondary compressor 2, and cooperates with the second evaporator 4 to form an ultra-low temperature cooling circuit, the output end of the second branch of the second evaporator is connected to the heater 14, and the temperature is stabilized in a more precise range through the cooperation of the two refrigeration circuits and the heater 14.
[0026] A first expansion valve 8 is provided between the condenser 5 and the first evaporator 3, and a second expansion valve 10 is provided between the first evaporator 3 and the second evaporator 4. The first expansion valve 8 and the second expansion valve 10 are electronic expansion valves, and the pressure of the refrigerant and the flow rate of the refrigerant are adjusted through the throttling effect of the first expansion valve 8 and the second expansion valve 10.
[0027] A liquid storage tank 6 is provided between the condenser 5 and the first expansion valve 8, and a dryer 7 is provided between the liquid storage tank 6 and the first expansion valve 8. The liquid storage tank 6 stores a certain amount of liquid to achieve the function of consumption replenishment, and the dryer 7 absorbs moisture and impurities in the refrigerant and the air to prevent refrigeration system failure and improve refrigeration efficiency.
[0028] A filter 9 is provided between the first evaporator 3 and the second expansion valve 10. The filter 9 protects the refrigeration system and blocks a large amount of impurities and harmful substances from entering the refrigeration system.
[0029] The output end of the secondary compressor 2 is provided with an oil separator 11, one end of the oil separator 11 is connected to the input end of the secondary compressor 2, and the other end is connected to the second branch of the first evaporator 3. The oil separator 11 is used to separate the lubricating oil and refrigerant in the compression molding machine to prevent the lubricating oil from accumulating in the refrigeration system and affecting the system efficiency.
[0030] The input end of the second branch of the evaporator is connected to a circulation pump 15, and the circulation pump 15 is connected to a liquid storage tank 13. The liquid storage tank 13 has a liquid storage function, and the circulation pump 15 circulates liquid to evacuate the air in the pipeline, and stores a certain amount of liquid to achieve the function of consumption replenishment.
[0031] The secondary compressor 2 and the first evaporator 3 are connected to a gas tank 16 via a pipeline branch, and the pipeline branch is provided with a solenoid valve 12. The gas tank 16 plays a buffering role, and when the internal pressure of the pipeline is too high, the gas can enter the gas tank 16 for a certain degree of buffering.
[0032] Furthermore, a first viewing window 17 is provided between the liquid storage tank 6 and the dryer 7 .
[0033] Furthermore, a second viewing window 18 is provided between the oil separator 11 and the secondary compressor 2 .
[0034] Furthermore, the liquid storage tank 13 , the heater 14 and the circulation pump 15 are all provided with a liquid discharge port 19 .
[0035] The working principle of the utility model is as follows: the first-stage compressor 1 uses refrigerant as a heat transfer medium, and the refrigerant is rapidly cooled down through the air-cooled condenser 5, and the pressure of the refrigerant and the refrigerant flow are adjusted through the throttling effect of the first expansion valve 8, and a local low-temperature cooling circuit is provided in combination with the first evaporator 3; the second-stage compressor 2 also uses refrigerant as a heat transfer medium, and the first evaporator 3 that provides a refrigeration effect through the first-stage compressor 1 constitutes the condenser 5 of the second-stage compressor 2, and the refrigerant is rapidly cooled down through the same form of heat exchange as the gas-liquid mixing and the gas-liquid mixing, and the pressure of the refrigerant and the refrigerant flow are adjusted through the throttling effect of the second expansion valve 10, and an ultra-low temperature cooling circuit is provided in combination with the second evaporator 4 used for special purposes; the refrigeration cycle system is used simultaneously with the low-power heater 14, and the liquid is circulated by matching with the pipeline and cooperating with the silent circulation pump 15. When a certain low temperature is reached through the second evaporator 4, heating is used to make the circulating liquid constant at a more accurate temperature value, and the system is regulated by PID.
[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.
Claims
1. A cascade high and low temperature system, characterized in that: include: A primary compressor, a secondary compressor, a first evaporator and a second evaporator, the primary compressor is connected to the first branch of the first evaporator, a condenser is arranged between the output end of the primary compressor and the first evaporator, one end of the second branch of the first evaporator is connected to the output end of the secondary compressor, the other end of the second branch of the first evaporator is connected to one end of the first branch of the second evaporator, the other end of the first branch of the second evaporator is connected to the input end of the secondary compressor, and the output end of the second branch of the second evaporator is connected to a heater.
2. A cascade high and low temperature system according to claim 1, characterized in that: A first expansion valve is disposed between the condenser and the first evaporator, and a second expansion valve is disposed between the first evaporator and the second evaporator.
3. A cascade high and low temperature system according to claim 2, characterized in that: A liquid storage tank is arranged between the condenser and the first expansion valve, and a drier is arranged between the liquid storage tank and the first expansion valve.
4. A cascade high and low temperature system according to claim 2, characterized in that: A filter is provided between the first evaporator and the second expansion valve.
5. The cascade high and low temperature system according to claim 1, characterized in that: An oil separator is provided at the output end of the secondary compressor, one end of the oil separator is connected to the input end of the secondary compressor, and the other end of the oil separator is connected to the second branch of the first evaporator.
6. The cascade high and low temperature system according to claim 1, characterized in that: The input end of the second branch of the evaporator is connected to a circulation pump, and the circulation pump is connected to a liquid storage tank.
7. The cascade high and low temperature system according to claim 1, characterized in that: A gas tank is connected between the secondary compressor and the first evaporator via a pipeline branch, and a solenoid valve is arranged on the pipeline branch.
8. The cascade high and low temperature system according to claim 3, characterized in that: A first viewing window is arranged between the liquid storage tank and the dryer.
9. The cascade high and low temperature system according to claim 5, characterized in that: A second viewing window is arranged between the oil separator and the secondary compressor.
10. The cascade high and low temperature system according to claim 6, characterized in that: The liquid storage tank, the heater and the circulating pump are all provided with liquid discharge ports.