Refrigerating system capable of preventing scroll compressor from sucking air and returning liquid

Abstract

The utility model provides a refrigerating system capable of preventing a scroll compressor from sucking air and returning liquid, which relates to the technical field of freezing and refrigerating refrigerating systems and comprises a compressor, a condenser, a liquid storage device, a drying filter, a liquid pipe liquid viewing mirror, a throttling device, an evaporator and a heat regenerator. The heat regenerator comprises an inlet I, an outlet I, an inlet II and an outlet II; an outlet II is connected with an inlet of a compressor, an outlet of the compressor is connected with an inlet of a condenser, an outlet of the condenser is connected with an inlet of a liquid storage device, an outlet of the liquid storage device is connected with an inlet I, an outlet I is connected with an inlet of a drying filter, and an outlet of the drying filter is connected with an inlet of a liquid pipe liquid viewing mirror. An outlet of the liquid pipe liquid sight glass is connected with an inlet of the evaporator, and an outlet of the evaporator is connected with the inlet II to form a refrigerating loop; the throttling devices are arranged at the two ends of the evaporator. The system provided by the utility model effectively improves the energy efficiency of the refrigerating system.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of frozen refrigeration refrigeration system, specifically, especially, it relates to a kind of refrigeration system for preventing scroll compressor suction gas-liquid. BACKGROUND

[0002] The current frozen refrigeration refrigeration system technology has wide application scenarios, and a typical refrigeration system is composed of a compressor, a condenser, a throttling device and an evaporator. It is completed by alternating the condensation and evaporation processes of the refrigerant. In general, the refrigeration system of scroll compressor cannot allow the problem of suction gas-liquid due to the special structure of scroll compressor, so it can only be applied to some frozen refrigeration systems with short refrigeration circuit and less refrigerant charge. To this end, people usually add a gas-liquid separator to the system to solve the problem of compressor suction gas-liquid, broaden the application scenarios and realize the expansion of scroll compressor to more application fields. For the application of scroll compressor suction gas-liquid and more refrigerant charge, such as ultra-low temperature freezer system, aluminum row freezer system, indoor and outdoor unit drop larger freezer system, and long pipe refrigeration system, most of them choose semi-closed piston compressor and screw compressor with stronger suction gas-liquid resistance.

[0003] However, the existing technology still has some shortcomings: first, the method of using a gas-liquid separator to prevent compressor backflow can cause compressor oil return failure. Second, the refrigeration system of semi-closed piston compressor and screw compressor with stronger suction gas-liquid resistance has the problems of large size, high cost and low energy efficiency compared with the refrigeration system of scroll compressor. Third, the compressor suction gas-liquid, any type of compressor has uncertain failure risk after long time running, such as dilution of liquid refrigerant leading to lubrication failure, low suction pressure causing large pressure ratio leading to high internal temperature and other problems. UTILITY MODEL CONTENTS

[0004] According to the technical problems mentioned in the above background technology, a refrigeration system for preventing scroll compressor suction gas-liquid is provided.

[0005] The technical means adopted by the utility model are as follows:

[0006] A refrigeration system for preventing scroll compressor suction gas-liquid, comprising:

[0007] A compressor, a condenser, a liquid accumulator, a drying filter, a liquid pipe sight glass, a throttling device, an evaporator and a heat exchanger;

[0008] The heat exchanger comprises an inlet I, an outlet I, an inlet II and an outlet II.

[0009] The outlet II is connected with the inlet of the compressor, the outlet of the compressor is connected with the inlet of the condenser, the outlet of the condenser is connected with the inlet of the liquid reservoir, the outlet of the liquid reservoir is connected with the inlet I, the inlet I is connected with the inlet of the dry filter, the outlet of the dry filter is connected with the inlet of the liquid sight glass, the outlet of the liquid sight glass is connected with the inlet of the evaporator, the outlet of the evaporator is connected with the inlet II, and a refrigeration circuit is formed.

[0010] The throttling device is arranged at two ends of the evaporator.

[0011] Further, the compressor is a scroll structure compressor.

[0012] Further, the regenerator is arranged at the outlet end of the condenser and the inlet end of the throttling device, and the regenerator is arranged at the outlet end of the evaporator and the inlet end of the compressor.

[0013] Further, the regenerator is internally provided with a low-temperature and low-pressure gaseous refrigerant pipeline and a high-temperature and high-pressure liquid refrigerant pipeline which are spirally arranged.

[0014] Further, the refrigeration circuit realizes refrigeration by filling refrigerant.

[0015] Further, the liquid refrigerant is one of HF, HF and HFO refrigerants.

[0016] Compared with the prior art, the refrigeration system has the following advantages:

[0017] 1. The refrigeration system for preventing the scroll compressor from sucking back liquid can be used in systems prone to sucking back liquid and having more refrigerant charging capacity, such as ultra-low-temperature cold storage, aluminum pipe cold storage system, indoor and outdoor machine cold storage system with large drop, and cold storage system with relatively long pipe line, so as to expand the application scenarios of the scroll compressor.

[0018] 2. The refrigeration system for preventing the scroll compressor from sucking back liquid mainly replaces the application field of the previous semi-enclosed piston compressor and screw compressor, has the advantages of small size, low cost and high energy efficiency, and has the characteristics of compact structure due to the small size of the regenerator compared with the gas-liquid separator, and further reduces the cost.

[0019] 3. The refrigeration system for preventing the scroll compressor from sucking back liquid, the regenerator has the functions of improving the suction superheat degree and evaporating the liquid refrigerant in the suction pipeline, and can also increase the supercooling degree, prevent more flash gas from being generated after the throttling, and improve the energy efficiency of the refrigeration system. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 The figure is a system structure schematic diagram of the present application.

[0022] In the figure: 1, compressor; 2, condenser; 3, liquid accumulator; 4, drying filter; 5, liquid pipe sight glass; 6, throttling device; 7, evaporator; 8, heat regenerator; a is inlet I; b is outlet I; c is inlet II; d is outlet II. DETAILED DESCRIPTION

[0023] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] It should be noted that the terms used herein are only for describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0026] The foregoing description, for purposes of explanation, sets forth specific values and arrangements of components and steps that are subject to many options. The intent is to be accurate in describing the principles and novel features of the application. Thus, although the application has been described with reference to specific embodiments thereof, it will be apparent to those of ordinary skill in the art that a number of changes can be made thereto without departing from the spirit and scope of the application. For example, the various features of the application can be used in any combination or sub-combination thereof. Accordingly, the application is not to be limited by the above description but is to be given full scope of the appended claims.

[0027] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are usually based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0028] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the example term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used herein is interpreted accordingly.

[0029] In addition, it should be noted that the use of "first", "second" and the like words to limit parts, only for the convenience of distinguishing the corresponding parts, if there is no further declaration, the above words have no special meaning, therefore, it cannot be understood as a limitation on the scope of protection of the present application.

[0030] AsFigure 1 As shown in the figure, the utility model is a refrigeration system for preventing the suction of the scroll compressor from returning liquid, which is used in the ultra-low temperature cold storage system, the aluminum cold storage system, the cold storage system with large difference between indoor and outdoor units, the cold storage system with relatively long piping, and the like, and is easy to cause the suction of the scroll compressor to return liquid and the refrigerant charging volume to be relatively large in the refrigeration, freezing and cold storage cold storage system. The utility model comprises a compressor 1, a condenser 2, a liquid accumulator 3, a drying filter 4, a liquid pipe sight glass 5, a throttling device 6, an evaporator 7 and a heat regenerator 8. The throttling device 6 is arranged at both ends of the evaporator 7.

[0031] In the present application, through the reverse Carnot cycle, the function of the compressor is to compress the steam with low pressure into steam with high pressure, so that the volume of the steam is reduced and the pressure is increased. The compressor sucks the working medium steam with low pressure from the evaporator, so that the pressure is increased and then sent to the condenser. In the condenser, the steam is condensed into liquid with high pressure. After throttling through the throttling valve, the liquid becomes liquid with low pressure, and then is sent to the evaporator. In the evaporator, the liquid is evaporated by absorbing heat to become steam with low pressure, and then is sent to the inlet of the compressor, so as to complete the refrigeration cycle.

[0032] In the present application, the heat regenerator 8 comprises an inlet Ia, an outlet Ib, an inlet IIc and an outlet IId.

[0033] Preferably, in the present application, the outlet IId is connected with the inlet of the compressor 1, the outlet of the compressor 1 is connected with the inlet of the condenser 2, the outlet of the condenser 2 is connected with the inlet of the liquid accumulator 3, the outlet of the liquid accumulator 3 is connected with the inlet Ia, the outlet Ib is connected with the inlet of the drying filter 4, the outlet of the drying filter 4 is connected with the inlet of the liquid pipe sight glass 5, the outlet of the liquid pipe sight glass 5 is connected with the inlet of the evaporator 7, the outlet of the evaporator 7 is connected with the inlet IIc, and a refrigeration circuit is formed.

[0034] As a preferred embodiment, in the present application, the compressor 1 is a scroll structure compressor. That is, the component of the compressor for compressing the gaseous refrigerant is a dynamic and static scroll engagement for compression,

[0035] As a preferred embodiment, the heat regenerator 8 is arranged at the inlet end of the throttling device 6 at the outlet end of the condenser 2; and the heat regenerator 8 is arranged at the outlet end of the evaporator 7 and the inlet end of the compressor 1. The heat regenerator 8 has a low-temperature suction pipe and a high-temperature liquid pipe, the low-temperature suction pipe and the high-temperature liquid pipe realize heat exchange, and the liquid refrigerant in the suction pipe is evaporated. If there is liquid refrigerant (suction return of the compressor) in the low-temperature and low-pressure gaseous refrigerant, the heat regenerator can realize heat exchange by absorbing the heat in the pipe of the high-temperature and high-pressure liquid refrigerant, so that the liquid refrigerant (suction return of the compressor) in the low-temperature and low-pressure gaseous refrigerant is evaporated into gaseous refrigerant, and the suction of the compressor is ensured to be gaseous refrigerant.

[0036] As preferred, the refrigeration circuit realizes refrigeration by filling refrigerant. The liquid refrigerant is one of HCFC, HFC and HFO refrigerants. The HCFC, HFC and HFO refrigerants can not cause negative pressure in the refrigeration system according to the refrigerant characteristics at low evaporation temperature. The refrigeration cycle system can be specifically used in refrigeration systems such as ice machines and ice cream machines, in addition to being used in the refrigeration system of the compressor suction easy return liquid and large refrigerant charge amount of the freezing and refrigeration system. It can also be extended to semi-closed piston machines and screw machines, and can improve the energy efficiency of the system.

[0037] It can be understood that, in the system in the present application, the refrigerant realizes refrigeration through the processes of condenser-throttling device-evaporator-compressor compression. When the refrigeration system has vortex compressor suction liquid return, the compressor liquid compression and liquid refrigerant flushing lubricating oil film to cause lubrication failure are prone to occur. At this time, the regenerator device provided in the system can realize heat exchange between the low-temperature suction line and the high-temperature liquid line, evaporate the liquid refrigerant in the suction line, effectively ensure that the compressor suction is all gaseous refrigerant, and improve the reliability of the compressor.

[0038] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A refrigeration system for preventing liquid return from the intake of a scroll compressor, characterized in that, include: Compressor (1), condenser (2), liquid receiver (3), dryer filter (4), liquid pipe sight glass (5), throttling device (6), evaporator (7) and regenerator (8); The regenerator (8) includes: inlet I (a), outlet I (b), inlet II (c) and outlet II (d); The outlet II (d) is connected to the inlet of the compressor (1), the outlet of the compressor (1) is connected to the inlet of the condenser (2), the outlet of the condenser (2) is connected to the inlet of the liquid receiver (3), the outlet of the liquid receiver (3) is connected to the inlet I (a), the outlet I (b) is connected to the inlet of the dryer filter (4), the outlet of the dryer filter (4) is connected to the inlet of the liquid pipe sight glass (5), the outlet of the liquid pipe sight glass (5) is connected to the inlet of the evaporator (7), and the outlet of the evaporator (7) is connected to the inlet II (c), thus forming a refrigeration circuit; The throttling device (6) is located at both ends of the evaporator (7).

2. The refrigeration system for preventing liquid return from the suction of a scroll compressor according to claim 1, characterized in that, The compressor (1) is a scroll compressor.

3. The refrigeration system for preventing liquid return from the suction of a scroll compressor according to claim 1, characterized in that, The regenerator (8) is located at the outlet end of the condenser (2) and the inlet end of the throttling device (6); and the regenerator (8) is located at the outlet end of the evaporator (7) and the inlet end of the compressor (1).

4. A refrigeration system for preventing liquid return from the suction of a scroll compressor according to claim 1 or 3, characterized in that, The regenerator (8) is equipped with a low-temperature, low-pressure gaseous refrigerant pipeline and a high-temperature, high-pressure liquid refrigerant pipeline that are mutually swirling.

5. A refrigeration system for preventing liquid return from the suction of a scroll compressor according to claim 1, characterized in that, The refrigeration circuit achieves refrigeration by filling it with refrigerant.

6. A refrigeration system for preventing liquid return from the suction of a scroll compressor according to claim 4, characterized in that, The liquid refrigerant in the refrigerant pipeline is one of the following: HCFC, HFC, or HFO refrigerants.

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