Compressor switching assembly
By designing the compressor switching components in the parallel refrigeration unit and dynamically switching the suction pressure, the problem that the compressor cannot dynamically switch the working pressure zone in the prior art is solved, and more efficient refrigeration efficiency and load adaptability are achieved.
Patent Information
- Application Number
- CN202420019725.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-03
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-01-03
AI Technical Summary
In existing parallel refrigeration units, the compressor cannot dynamically switch to operate in medium or low pressure zones, resulting in the inability to effectively utilize the compressor when the load changes, and multiple compressors are required to meet the load requirements of different temperature zones, so the unit cannot fully utilize. refrigeration capacity.
Design a compressor switching assembly. By setting the switching assembly at the compressor inlet, the compressor can dynamically switch to access different suction pressure points and change the suction pressure, thereby achieving medium and low temperature switching and different refrigeration capabilities. combination.
The compressor dynamically switches the working pressure zone according to the load demand, improves the refrigeration efficiency and load adaptability of the refrigeration unit, reduces the demand for multiple compressors, and improves the overall refrigeration capacity of the unit.
Smart Images
Figure CN222504449U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of refrigeration systems, in particular to a compressor switching component. Background Art
[0002] In common parallel refrigeration units, compressors can only work in medium or low pressure zones, and cannot dynamically select which temperature zone to work in according to load requirements. Therefore, compressors at a certain evaporation temperature are relatively fixed. When the load decreases and the compressors stop, these stopped compressors cannot be used by other evaporation temperature zones with large loads. Often, multiple compressors are required to meet different medium and low temperature load requirements, and the refrigeration capacity of the unit cannot be fully utilized.
[0003] Therefore, a technical solution is needed to overcome the above problems. Utility Model Content
[0004] In order to make up for some deficiencies in the prior art, the purpose of the utility model is to provide a compressor switching component to solve the above-mentioned technical problems.
[0005] In order to achieve its purpose, the utility model adopts the following technical solutions: a compressor switching assembly, comprising a first compressor and a switching assembly arranged at the inlet of the first compressor;
[0006] Wherein, the switching component is used to access different suction pressures;
[0007] The first compressor can be connected to different suction pressure points through dynamic switching of the switching component to change the suction pressure of the first compressor.
[0008] Preferably, the compressor switching assembly is used in a parallel refrigeration cycle, and the switching assembly comprises a first valve arranged on the inlet of the first compressor for connecting to a first suction pressure point in the refrigeration cycle and a second valve arranged on the inlet of the first compressor for connecting to a second suction pressure point in the refrigeration cycle;
[0009] The first compressor can change a suction pressure of the first compressor by switching between the first valve and the second valve.
[0010] Preferably, the pressure at the first suction pressure point is greater than the pressure at the second suction pressure point.
[0011] Preferably, the first valve is a solenoid valve, and the second valve is a one-way valve.
[0012] Preferably, the compressor switching assembly is arranged in multiple groups in parallel on the refrigeration cycle, wherein the first valve inlet of each of the first compressors is connected in parallel to the first suction pressure point on the refrigeration cycle, and the second valve inlet is connected in parallel to the second suction pressure point on the refrigeration cycle.
[0013] The compressor switching component in the utility model is provided with a switching component capable of switching the suction force of the compressor at the inlet of the compressor, so that the compressor can be switched to different suction pressure points as needed, so that the compressor can be connected to different evaporation pressures, and the medium temperature and low temperature switching of the suction end of the compressor can be realized, thereby realizing different refrigeration capacity combinations of medium temperature and low temperature. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0015] Figure 1 It is a structural schematic diagram of the compressor switching assembly in the utility model;
[0016] Figure 2 It is a structural schematic diagram of a refrigeration cycle with switchable compressor suction in the utility model.
[0017] In the figure: 1. first compressor; 2. condenser; 3. expansion valve; 31. first expansion valve; 32. second expansion valve; 4. evaporator; 41. first evaporator; 42. second evaporator; 5. switching component; 51. first valve; 52. second valve; 6. suction pressure regulating valve. DETAILED DESCRIPTION
[0018] The utility model is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0019] It should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0020] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like 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, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0021] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0022] In the above description, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0023] Figure 1 The utility model is a schematic diagram of the overall structure of a compressor switching assembly.
[0024] like Figure 1 As shown, a compressor switching assembly includes a first compressor 1 and a switching assembly 5 arranged on the inlet of the first compressor 1 for switching the suction pressure of the first compressor 1.
[0025] The above-mentioned compressor switching component can be used in a parallel refrigeration cycle. The switching component is used to connect to different suction pressures. The switching component includes a first valve 51 arranged on the inlet of the first compressor 1 for connecting to a first suction pressure point in the refrigeration cycle and a second valve 52 arranged on the inlet of the first compressor 1 for connecting to a second suction pressure point in the refrigeration cycle. The inlet of the first compressor 1 can be switched between the first valve 51 and the second valve 52 to change the suction pressure of the first compressor 1.
[0026] Preferably, the pressure at the first suction pressure point is greater than the pressure at the second suction pressure point.
[0027] Preferably, the first valve 51 is a solenoid valve, and the second valve 52 is a one-way valve.
[0028] Preferably, multiple sets of compressor switching components are arranged in parallel in the refrigeration cycle. In the refrigeration cycle, the first valve inlet of each first compressor is connected in parallel to the first suction pressure point on the refrigeration cycle, and the second valve inlet is connected in parallel to the second suction pressure point on the refrigeration cycle. Multiple sets of compressor switching components are used in parallel, so that when the refrigeration cycle is externally loaded, multiple modes can be adjusted. The first compressor 1 can be turned on according to the load demand, so that more combinations are formed. Multiple first compressors 1 can be switched to work in the medium or low temperature zone as needed, thereby forming different medium and low temperature refrigeration capacity combinations, so that a set of parallel units can cover a wider range.
[0029] The following is an example of the use of the compressor switching assembly in a refrigeration cycle, but the structure of the refrigeration cycle to which the compressor switching assembly of the present invention is applied is not limited to the following structure.
[0030] Implementation Cases:
[0031] like Figure 2 As shown,
[0032] A refrigeration cycle with switchable compressor suction (hereinafter referred to as refrigeration cycle), which is connected in parallel with the above-mentioned compressor switching component ( Figure 2 The refrigeration cycle also includes a second compressor (which may include Figure 2The second compressor 7 and the second compressor 8 in the refrigeration cycle), the condenser 2, the expansion valve 3, the evaporator 4 and the suction pressure regulating valve 6. When the compressor switching component is connected in parallel in the refrigeration cycle, the inlet of the compressor switching component is connected to the outlet of the evaporator 4 (including the first evaporator 41 and the second evaporator 42 connected in parallel), and the outlet is connected to the inlet of the condenser 2. The first compressor 1, the condenser 2, the expansion valve 3 and the evaporator 4 (the first evaporator 41 or the second evaporator 42) are connected in sequence to form a refrigeration cycle. The refrigerant can be compressed in the first compressor 1 to form a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant is sent to the condenser 2 for cooling, and becomes a medium-temperature and high-pressure liquid refrigerant after cooling. A suction pressure regulating valve 6 is arranged between the outlets of the first evaporator 41 and the second evaporator 42 connected in parallel. The pressure drop generated by the suction pressure regulating valve 6 between the outlets of the first evaporator 41 and the second evaporator 42 forms two different suction pressure points. Specifically, the evaporation pressure at the inlet of the suction pressure regulating valve 6 is relatively high, generally 3-6 bar, which is defined as the first suction pressure point; the evaporation pressure at the outlet of the suction pressure regulating valve 6 is relatively low, generally 0.02-3 bar, which is suitable for low-temperature evaporators and is defined as the second suction pressure point. The pressure at the first suction pressure point is greater than the pressure at the second suction pressure point.
[0033] Furthermore, the inlets of the first evaporator 41 and the second evaporator 42 connected in parallel are both provided with expansion valves 3. Specifically, the first expansion valve 31 provided at the inlet of the first evaporator 41 and the second expansion valve 32 provided at the inlet of the second evaporator 42. The expansion valve 3 is used to throttle and reduce the pressure of the high-temperature and high-pressure liquid refrigerant before it is sent to the evaporator 4.
[0034] Because the performance of the first compressor 1 is greatly affected by its suction pressure, when the suction pressure decreases, the refrigeration efficiency decreases a lot. If all compressors (the first compressor 1, the second compressor 7 and the second compressor 8) are working at the outlet of the second evaporator 42, when the evaporation pressure of the second evaporator 42 is low, the refrigeration energy efficiency of the entire refrigeration unit will decrease significantly, resulting in a decrease in the cooling capacity of the first evaporator 41. If each compressor can form different capacity combinations at the first suction pressure point and the second suction pressure point according to the cooling capacity of the first evaporator 41 and the second evaporator 42, only the necessary compressors will refrigerate the second suction pressure point to ensure that the low-temperature cooling capacity meets the requirements, and the remaining compressors will work in the medium temperature zone with a higher cooling efficiency. In this way, the cooling capacity of the medium temperature load will be greatly reduced by the influence of the low temperature load, and the overall cooling capacity of the unit will be greatly improved.
[0035] To this end, the first valve 51 in the switching assembly 5 is connected to the inlet of the suction pressure regulating valve 6, and the second valve 52 is connected to the outlet of the suction pressure regulating valve 6, so that the first compressor 1 can change the suction pressure of the first compressor 1 by switching between the first valve 51 and the second valve 52. The first compressor 1 can choose to operate at the first suction pressure or the second suction pressure as needed.
[0036] When the pressure at the first suction pressure point is higher than expected, it means that the cooling load at the first suction pressure point is higher than the cooling capacity. At this time, the first valve 51 at the inlet of the first compressor 1 is triggered to open, and the second valve 52 is closed. The inlet of the first compressor 1 is connected to the first suction pressure point. The first compressor 1 works at a higher suction pressure and cools the second evaporator 42 with a higher refrigeration efficiency.
[0037] When the pressure at the second suction pressure point is higher than expected, it means that the cooling load at the second suction pressure point is higher than the cooling capacity. At this time, the first valve 51 of the first compressor 1 is triggered to close, and the second valve 52 is opened. The inlet of the first compressor 1 is connected to the second suction pressure point to cool the first evaporator 41. At this time, in order to meet the low-temperature refrigeration requirements, the decreased refrigeration efficiency of the first compressor 1 does not affect the cooling capacity of the first suction pressure point (i.e., the second evaporator 42).
[0038] Furthermore, the first valve 51 is a solenoid valve, and the second valve 52 is a one-way valve; when the first valve 51 is opened, since the inlet pressure of the second valve 52 is the pressure of the second suction pressure point, and the outlet pressure is the pressure of the first suction pressure point, the inlet pressure of the second valve 52 is lower than the outlet pressure, and the passage between the first compressor 1 and the second suction pressure point is automatically blocked, so that the first compressor 1 works at the first suction pressure point; when the first valve 51 is closed, since the inlet pressure of the second valve 52 is the second suction pressure point, the outlet pressure connected to the suction of the first compressor 1 continues to decrease, and the outlet pressure of the second valve 52 is lower than the inlet pressure, and the second valve 52 automatically opens the passage between the first compressor 1 and the second suction pressure point, so that the first compressor 1 works and is connected to the second suction pressure point; the control points are reduced, and the system is simpler and more reliable.
[0039] In some embodiments, in the refrigeration cycle, multiple first compressors 1 are arranged in parallel, and the multiple first compressors 1 are all provided with a first valve 51 and a second valve 52 at the inlet, that is, multiple sets of compressor switching components are arranged in parallel on the refrigeration cycle. Specifically, in this embodiment, there are two first compressors 1, and the two first compressors 1 are connected in parallel on the refrigeration cycle, and a switching component 5 (a first valve 51 and a second valve 52) is provided between the inlet of each first compressor 1 and the inlet and outlet of the suction pressure regulating valve 6, so that each first compressor 1 can be switched to connect to different suction pressure points, forming a variety of cooling capacity combinations in different areas.
[0040] Specifically, in the present embodiment, the two first compressors 1 are provided with a first valve 51 and a second valve 52 at the inlet, the inlets of the two first valves 51 are connected to the inlet of the suction pressure regulating valve 6, and the inlets of the two second valves 52 are connected to the outlet of the suction pressure regulating valve 6. If the loads external to the refrigeration cycle are all high-temperature loads, the solenoid valves (first valves 51) of the suction ports of all the first compressors 1 are opened, the inlets of the first compressors 1 are switched to be connected to the inlet of the suction pressure regulating valve 6, and the first compressors 1 operate in a medium-pressure state; if some of the loads external to the refrigeration cycle operate at medium pressure and some of the loads operate at low pressure, the solenoid valves (first valves 51) of some of the first compressors 1 are opened, and the working When operating in a medium-pressure state, part of the solenoid valves (first valves 51) at the air intake of the first compressor 1 are closed, and at this time the one-way valve (second valve 52) is automatically turned on and operates in a low-pressure state; through the cooperation of the first evaporator 41, the second evaporator 42 and the switching component 5 (the first valve 51 and the second valve 52), the refrigeration cycle can form a variety of refrigeration capacity combinations according to the different cooling capacities of the second evaporator 42 and the first evaporator 41, such as: all the first compressors 1 are turned on, and a mode of one first compressor 1 at medium temperature and one first compressor 1 at low temperature, two first compressors 1 at medium temperature and no first compressor 1 at low temperature, two first compressors 1 at low temperature and no first compressor 1 at medium temperature can be formed.
[0041] The compressor switching component of the utility model is provided with a switching component capable of switching the suction force of the compressor at the inlet of the compressor, so that the compressor can be switched to different suction pressure points as needed, so that the compressor is connected to different evaporation pressures, and the medium temperature and low temperature switching of the suction end of the compressor can be realized, thereby realizing different refrigeration capacity combinations of medium temperature and low temperature.
[0042] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. A compressor switching assembly, characterized in that: It includes a first compressor and a switching assembly disposed at the inlet of the first compressor; Wherein, the switching component is used to access different suction pressures; The first compressor can be connected to different suction pressure points through dynamic switching of the switching component to change the suction pressure of the first compressor.
2. A compressor switching assembly according to claim 1, characterized in that: The compressor switching assembly is used in a parallel refrigeration cycle, and the switching assembly includes a first valve arranged on the inlet of the first compressor for connecting to a first suction pressure point in the refrigeration cycle and a second valve arranged on the inlet of the first compressor for connecting to a second suction pressure point in the refrigeration cycle; The first compressor can change a suction pressure of the first compressor by switching between the first valve and the second valve.
3. A compressor switching assembly according to claim 2, characterized in that: The pressure at the first suction pressure point is greater than the pressure at the second suction pressure point.
4. A compressor switching assembly according to claim 3, characterized in that: The first valve is a solenoid valve, and the second valve is a one-way valve.
5. A compressor switching assembly according to any one of claims 2 to 4, characterized in that: The compressor switching components are arranged in multiple groups in parallel on the refrigeration cycle, wherein the first valve inlet of each of the first compressors is connected in parallel to the first suction pressure point on the refrigeration cycle, and the second valve inlet is connected in parallel to the second suction pressure point on the refrigeration cycle.