Balanced pressure starting refrigerating system of scroll compressor for medium and low temperature

Abstract

The utility model relates to the technical field of medium and low temperature refrigeration, in particular to a balanced pressure starting refrigerating system of a scroll compressor for medium and low temperature. The closed-loop refrigerating system is formed by sequentially connecting a compressor, a high-pressure switch, a one-way valve, an oil separator, a condenser, a liquid storage device, a drying filter, a liquid pipe electromagnetic valve, a liquid viewing mirror, an expansion valve, an evaporator, a gas-liquid separator, an air suction filter, a low-pressure switch and the compressor. An exhaust pipe and an air suction pipe of the compressor are connected with the inlet end A and the outlet end B of the balance pressure electromagnetic valve respectively to form a gaseous refrigerant loop. The compressor is of a vortex internal low-pressure cavity structure. An inlet of the compressor is a low-pressure side, and an outlet is a high-pressure side. The inlet end A of the balance pressure electromagnetic valve is arranged on a pipeline between the high-pressure side of the compressor and the one-way valve; and an outlet end B of the balance pressure electromagnetic valve is arranged on a low-pressure air return pipeline of the compressor.

Description

Technical Field

[0001] This utility model relates to a balanced pressure start-up refrigeration system for a scroll compressor used in medium and low temperatures, and particularly to a balanced pressure start-up refrigeration system for a scroll compressor used in medium and low temperatures. Background Technology

[0002] Currently, medium- and low-temperature refrigeration technology has a wide range of applications. The refrigeration cycle involves high-temperature, high-pressure refrigerant being condensed in a condenser, followed by throttling and pressure reduction of the high-pressure refrigerant liquid. The refrigerant then enters the evaporator to absorb heat and achieve the required cooling. The compressor's start and stop are controlled by a low-pressure switch, thereby achieving the low-temperature refrigeration requirements of the application scenario. Medium- and low-temperature refrigeration is currently widely used in food, pharmaceutical, chemical, military, aerospace, semiconductor, and scientific research fields.

[0003] When existing medium- and low-temperature refrigeration systems start up under high pressure ratio conditions in summer, the compressor starting torque is closely related to the suction and discharge pressures. The starting torque increases with the increase of the compression ratio, and the higher the discharge pressure, the greater the torque required by the motor. After a short shutdown, there is a torque required to overcome the pressure difference, especially in scroll single-phase refrigeration systems, which greatly increases the instantaneous load torque during startup. This low-temperature scroll compressor with balanced pressure starting can improve the starting performance of medium- and low-temperature scroll compressors, reduce compressor starting current, and improve the operational reliability of the refrigeration system.

[0004] In view of the problems existing in the above-mentioned existing technologies, it is necessary to study and design a new type of medium and low temperature scroll compressor balanced pressure start-up refrigeration system to overcome the problems existing in the existing technologies. Summary of the Invention

[0005] This invention addresses the problems existing in the prior art by providing a balanced pressure start-up refrigeration system for a scroll compressor used in medium and low temperature applications.

[0006] The technical means adopted in this utility model are as follows:

[0007] A medium-low temperature scroll compressor balanced pressure start refrigeration system is a closed-loop refrigeration system consisting of a compressor, a high-pressure switch, a one-way valve, an oil separator, a condenser, a liquid receiver, a dryer filter, a liquid line solenoid valve, a sight glass, an expansion valve, an evaporator, a gas-liquid separator, a suction filter, a low-pressure switch, and then the compressor connected in sequence.

[0008] Furthermore, the compressor's discharge pipe and suction pipe are connected to the inlet end A and outlet end B of the balancing pressure solenoid valve, respectively, to form a gaseous refrigerant circuit.

[0009] Furthermore, the compressor has a low-pressure chamber structure inside a scroll.

[0010] Furthermore, the compressor's inlet is on the low-pressure side, and its outlet is on the high-pressure side.

[0011] Furthermore, the inlet A of the balancing pressure solenoid valve is located on the pipeline between the high-pressure side of the compressor and the check valve;

[0012] Furthermore, the outlet B of the balancing pressure solenoid valve is located on the low-pressure return gas line of the compressor.

[0013] Furthermore, the combination of a balancing solenoid valve and a check valve can quickly balance the high and low pressures of the refrigeration system when the ambient temperature is high and the system faces a large pressure ratio, thus meeting the requirements for rapid start-up and ensuring reliable compressor operation.

[0014] Furthermore, the combination of a pressure balancing solenoid valve and a check valve can quickly balance the pressure ratio of the refrigeration system when the ambient temperature is high, thereby reducing the starting current and minimizing the impact on the power grid.

[0015] Furthermore, the pressure balancing solenoid valve and the check valve need to be used in combination. If the check valve is missing, the low-pressure switch will quickly reset and start when the ambient temperature is high. At this time, the pressure on the high-pressure side is much greater than the pressure on the low-pressure side, and the compressor will still start under pressure.

[0016] Furthermore, equal pressure starting of the compressor can reduce the starting current and decrease the impact on the power grid.

[0017] Furthermore, HFC refrigerants include: R404A, R448A, R449A, and R507A.

[0018] Furthermore, low-temperature refrigeration systems can be used in low-temperature cold storage, low-temperature testing equipment, and other low-temperature related fields.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The medium-low temperature scroll compressor balanced pressure start-up refrigeration system provided by this utility model uses a combination of balanced pressure solenoid valve and one-way valve; it can quickly balance the high and low pressure of the refrigeration system, ensuring that the compressor starts and runs under equal pressure, while reducing the compressor starting current and reducing the impact on the power grid.

[0021] 2. The medium-low temperature scroll compressor balanced pressure start-up refrigeration system provided by this utility model has a balanced pressure solenoid valve that causes the high-pressure gaseous refrigerant on the exhaust side to flow to the low-pressure suction side. The principle is similar to the function of a one-way valve. When the compressor needs to start, the balanced pressure solenoid valve opens, and the pressure difference between the high and low pressures is quickly balanced. After the compressor starts, the balanced pressure solenoid valve closes, and the suction and exhaust pressures are quickly established again due to the compression of the refrigerant gas by the compressor. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the system of this utility model.

[0024] In the diagram: 1. Compressor; 2. Balance pressure solenoid valve; 3. High pressure switch; 4. Check valve; 5. Oil separator; 6. Condenser; 7. Liquid receiver; 8. Dryer filter; 9. Liquid line solenoid valve; 10. Sight glass; 11. Expansion valve; 12. Evaporator; 13. Gas-liquid separator; 14. Suction filter; 15. Low pressure switch. Detailed Implementation

[0025] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0029] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0030] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0032] like Figure 1 As shown, this utility model provides a medium-low temperature scroll compressor balanced pressure start-up refrigeration system, which is a closed-loop refrigeration system consisting of compressor 1, high-pressure switch 3, one-way valve 4, oil separator 5, condenser 6, liquid receiver 7, dryer filter 8, liquid line solenoid valve 9, sight glass 10, expansion valve 11, evaporator 12, gas-liquid separator 13, suction filter 14, low-pressure switch 15, and then compressor 1 connected in sequence; compressor 1 has a scroll internal low-pressure chamber structure. The discharge pipe and suction pipe of compressor 1 are connected to the inlet end A and outlet end B of balanced pressure solenoid valve 2, respectively, forming a gaseous refrigerant circuit.

[0033] The inlet of compressor 1 is the low-pressure side, and the outlet is the high-pressure side.

[0034] The inlet A of the balancing pressure solenoid valve 2 is located on the pipeline between the high-pressure side of the compressor 1 and the one-way valve 4; the outlet B of the balancing pressure solenoid valve 2 is located on the low-pressure return gas pipeline of the compressor.

[0035] The combination of the balancing solenoid valve 2 and the one-way valve 4 can meet the requirements of rapid balancing of high and low pressure in the refrigeration system when the ambient temperature is high and the system faces a large pressure ratio, so as to achieve the requirement of rapid start-up and ensure reliable operation of the compressor.

[0036] The combination of the balancing solenoid valve 2 and the one-way valve 4 can quickly balance the pressure ratio of the refrigeration system when the ambient temperature is high, thereby reducing the starting current and minimizing the impact on the power grid.

[0037] The balancing pressure solenoid valve 2 and the one-way valve 4 need to be used together. If the one-way valve 4 is missing, the low-pressure switch will quickly reset and start when the ambient temperature is high. At this time, the pressure on the high-pressure side is much greater than the pressure on the low-pressure side, and the compressor will still start under pressure.

[0038] This system meets the requirement of quickly balancing the high and low pressures of the system before restarting after a short shutdown in high-temperature summer environments. At the same time, it reduces the compressor starting current and minimizes the impact on the power grid, creating conditions for stable start-up operation. In particular, the application of this system can make the refrigeration system of the scroll single-phase refrigeration system operate more stably.

[0039] The refrigerants are HFC refrigerants such as R404A, R448A, R449A, and R507.

[0040] In addition to its application in medium and low temperature cold storage, the refrigeration cycle system can also be used in low temperature environmental test chambers and other low temperature application fields.

[0041] In use: The medium and low temperature scroll compressor refrigeration system achieves refrigeration through the processes of condensation in the condenser, throttling in the expansion valve, and evaporation in the evaporator. When the operating environment temperature rises and it needs to be turned on again to cool down, the high and low pressure in the system can be quickly balanced by using the combination of the balancing pressure solenoid valve and the exhaust check valve. This reduces the compressor starting current and the impact on the power grid, thereby ensuring the reliability of compressor 1's start-up operation.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A balanced pressure start-up refrigeration system for a scroll compressor used in medium and low temperatures, characterized in that: The medium-low temperature scroll compressor balanced pressure start refrigeration system is a closed-loop refrigeration system consisting of a compressor (1), a high pressure switch (3), a one-way valve (4), an oil separator (5), a condenser (6), a liquid receiver (7), a dryer filter (8), a liquid line solenoid valve (9), a sight glass (10), an expansion valve (11), an evaporator (12), a gas-liquid separator (13), a suction filter (14), a low pressure switch (15), and then the compressor (1) connected in sequence. The exhaust pipe and suction pipe of the compressor (1) are respectively connected to the inlet end A and the outlet end B of the balanced pressure solenoid valve (2) to form a gaseous refrigerant circuit.

2. The balanced pressure start-up refrigeration system for a scroll compressor used in medium and low temperatures according to claim 1, characterized in that: The compressor (1) has a vortex internal low-pressure chamber structure.

3. The balanced pressure start-up refrigeration system for a scroll compressor used in medium and low temperatures according to claim 1, characterized in that: The compressor (1) has a low-pressure inlet and a high-pressure outlet.

4. The balanced pressure start-up refrigeration system for a scroll compressor used in medium and low temperatures according to claim 1, characterized in that: The inlet end A of the solenoid valve (2) is located on the pipeline between the high-pressure side of the compressor (1) and the check valve (4); The outlet B of the solenoid valve (2) is located on the low-pressure return gas pipeline of the compressor.

5. The balanced pressure start-up refrigeration system for a scroll compressor used in medium and low temperatures according to claim 4, characterized in that: The combination of the solenoid valve (2) and the check valve (4) can meet the requirements of rapid start-up when the ambient temperature is high and the refrigeration system faces a large pressure ratio, thus ensuring the reliable operation of the compressor.

6. The balanced pressure start-up refrigeration system for a scroll compressor used in medium and low temperatures according to claim 4, characterized in that: The combination of the solenoid valve (2) and the check valve (4) can quickly balance the pressure ratio of the refrigeration system when the ambient temperature is high, thereby reducing the starting current and reducing the impact on the power grid.

7. The balanced pressure start-up refrigeration system for a scroll compressor used in medium and low temperatures according to claim 4, characterized in that: The solenoid valve (2) and check valve (4) mentioned above need to be used together. If the check valve (4) is missing, the low-pressure switch will quickly reset and start when the ambient temperature is high. At this time, the pressure on the high-pressure side is much greater than the pressure on the low-pressure side, and the compressor will still start under pressure.

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