Separator for high-pressure section of CO2 refrigerating unit

Abstract

The invention relates to a separator for a high-pressure section of a CO2 refrigerating unit, and relates to the technical field of separators, the separator comprises a separator cylinder, a refrigerant inlet is formed in the outer wall of the separator cylinder, an impact plate is arranged at the position, corresponding to the refrigerant inlet, in the separator cylinder, and an upper-layer flow guide plate is arranged above the impact plate; a gas refrigerant outlet is formed in the upper part of the separator barrel; a lower-layer guide plate is arranged at the lower part of the separator cylinder impact plate; and a liquid refrigerant outlet is formed below the lower-layer guide plate. According to the invention, the separator is additionally arranged in front of the ejector, a refrigerant enters the separator through the refrigerant inlet and directly flows to the impact plate, and liquid naturally falls and enters the pressure regulating valve through the liquid refrigerant outlet. The gas refrigerant is guided by the lower-layer guide plate and enters the ejector from the gas refrigerant outlet. According to the invention, gas and liquid in the refrigerant from the gas cooler are separated, so that the gas refrigerant enters the ejector, and the efficiency of the ejector is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of separators, and in particular to a separator used in a high-pressure section of a CO2 refrigeration unit. Background Art

[0002] Freon is widely used as a man-made refrigerant in household appliances and industrial processes. If it spreads into the atmosphere, it will destroy the ozone layer. The world is looking for green and environmentally friendly refrigerants. In the long run, CO2 refrigerant is in line with the development trend of green and environmentally friendly natural refrigerants. When using CO2 refrigeration systems, energy efficiency is an inevitable topic. After several generations of technological updates, the use of ejectors has further improved the energy efficiency of CO2 refrigeration units. In the CO2 refrigeration system, the fluid cooled by the air cooler is usually a gas-liquid two-phase mixture. If it enters the ejector directly, the gas-liquid two-phase fluid will affect the working efficiency of the ejector and may even cause the ejector to fail. The use characteristic of the ejector is that the high-pressure inlet needs to be high-pressure gas. If there is liquid mixed in, it will affect the ejection effect. However, the current products in the industry do not have a separation device before the ejector. Therefore, it is necessary to design a separator that can be used before the ejector inlet to separate the gas from the liquid. Summary of the invention

[0003] According to the technical problem raised above, a separator for the high-pressure section of a CO2 refrigeration unit is provided. The present invention applies the high-pressure section of a CO2 refrigeration unit, and the pressure bearing capacity reaches at least 12MPa. The separator is located between the outlet of the air cooler and the inlet of the ejector. The liquid in the gas-liquid two-phase refrigerant cooled by the air cooler is prevented from entering the high-pressure inlet of the ejector, which causes the ejector effect to decrease.

[0004] The technical means adopted by the present invention are as follows: A separator for a high-pressure section of a CO2 refrigeration unit comprises a separator cylinder, wherein a refrigerant inlet is arranged on the outer wall of the separator cylinder, an impact plate is arranged at a position corresponding to the refrigerant inlet in the separator cylinder, an upper guide plate is arranged above the impact plate, a gas refrigerant outlet is arranged above the separator cylinder, a lower guide plate is arranged below the separator cylinder impact plate, and a liquid refrigerant outlet is arranged below the lower guide plate.

[0005] Furthermore, a separator upper end cover is arranged above the separator cylinder, and a separator lower end cover is arranged below the separator cylinder, the gas refrigerant outlet is arranged on the separator upper end cover, and the liquid refrigerant outlet is arranged on the separator lower end cover.

[0006] Further, the impact plate is arranged vertically, and a plurality of groups of auxiliary guide plates are arranged on the side of the impact plate facing the refrigerant inlet, and the auxiliary guide plates are arranged in a herringbone shape. Specifically, each group of auxiliary guide plates forms a herringbone structure, and the two auxiliary guide plates on the left and right of each group are staggered in the height direction, and the cross section formed by all the auxiliary guide plates can completely cover the projection shape of the refrigerant inlet on the impact plate; The back side of the impact plate is connected with a middle-layer guide plate, and the middle-layer guide plate is welded to the inner side of the separator cylinder.

[0007] Furthermore, the middle guide plate is a circular plate with evenly distributed through holes, and the sum of the cross-sectional areas of all the through holes must be larger than the cross-sectional area of ​​the refrigerant inlet. The middle guide plate not only has the functions of guiding and separating, but also serves as a back support and reinforcement for the impact plate.

[0008] Furthermore, the lower guide plate is a circular plate with a notch, the outer diameter of which matches the inner diameter of the separator cylinder, and which is welded to the inner side of the separator cylinder, and the notch is arranged on the outer circumferential surface of the circular plate, and is used to guide the refrigerant blocked by the impact plate. Thus, the liquid refrigerant flows into the lower layer and enters the system through the liquid refrigerant outlet pipe. At the same time, another key function of setting the lower guide plate is to guide the gas refrigerant from above to the middle and upper guide plates of the upper layer, thereby avoiding the impact of the high-pressure gas refrigerant on the liquid refrigerant surface of the lower layer, resulting in the instability of the liquid surface and affecting the monitoring data of the liquid level sensor.

[0009] Furthermore, the upper guide plate is a circular plate, on which evenly distributed through holes are opened, and the sum of the cross-sectional areas of all the through holes needs to be larger than the cross-sectional area of ​​the refrigerant inlet.

[0010] Furthermore, the positions of the circular holes of the upper guide plate and the middle guide plate are all staggered without overlap.

[0011] Furthermore, a filter screen is provided between the upper guide plate and the upper end cover of the separator. The filter screen is made of stainless steel, and the height of the stainless steel filter screen is usually about 100 mm, and the mesh number of the filter screen is usually about 100 to 150 meshes. The height and mesh number of the filter screen can also be adjusted according to different working conditions.

[0012] Furthermore, the separator fixing piece is arranged outside the separator cylinder and is welded to the separator cylinder. The size and quantity of the separator fixing piece can be adjusted according to different working conditions.

[0013] Furthermore, it is applied to the pre-separation system of the high-pressure section of the CO2 refrigeration unit, after the outlet of the air cooler and before the ejector.

[0014] Compared with the prior art, the present invention has the following advantages: the present invention adds a separator in front of the ejector, and the refrigerant enters the separator through the refrigerant inlet and flows directly to the impact plate, so that the liquid naturally falls through the gaps around the lower guide plate, flows into the lower end cover of the separator, and enters the pressure regulating valve through the liquid refrigerant outlet. The gas refrigerant passes through the lower guide plate, the middle guide plate and the upper guide plate, through the filter screen, and enters the ejector from the gas refrigerant outlet. Thereby, the gas and liquid in the refrigerant from the air cooler are separated, so that what enters the ejector is gas refrigerant, which ensures the efficiency of the ejector. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is a schematic diagram of the external structure of the present invention.

[0017] Figure 2 It is a structural explosion diagram of the present invention.

[0018] In the figure: 1. separator cylinder, 2. separator upper end cover, 3. filter screen, 4. upper guide plate, 5. refrigerant inlet, 6. impact plate, 7. lower guide plate, 8. liquid level sensor interface, 9. gas refrigerant outlet, 10. middle guide plate, 11. separator fixing part, 12. separator lower end cover, 13. liquid refrigerant outlet. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0023] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0024] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0025] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0026] like Figure 1 , Figure 2 As shown, an embodiment of the present invention discloses a separator for a high-pressure section of a CO2 refrigeration unit, comprising a separator cylinder 1, an outer wall of the separator cylinder is provided with a refrigerant inlet 5, an impact plate 6 is provided at a position corresponding to the refrigerant inlet in the separator cylinder, an upper guide plate 4 is provided above the impact plate, a gas refrigerant outlet 9 is provided above the separator cylinder; a lower guide plate 7 is provided below the separator cylinder impact plate; and a liquid refrigerant outlet 13 is provided below the lower guide plate.

[0027] Furthermore, a separator upper end cover 2 is arranged above the separator cylinder, a separator lower end cover 12 is arranged below the separator cylinder, the gas refrigerant outlet is arranged on the separator upper end cover, and the liquid refrigerant outlet is arranged on the separator lower end cover.

[0028] Further, the impact plate is arranged vertically, and a plurality of groups of auxiliary guide plates are arranged on the side of the impact plate facing the refrigerant inlet, and the auxiliary guide plates are arranged in a herringbone shape. Specifically, each group of auxiliary guide plates forms a herringbone structure, and the two auxiliary guide plates on the left and right of each group are staggered in the height direction, and the cross section formed by all the auxiliary guide plates can completely cover the projection shape of the refrigerant inlet on the impact plate; The back of the impact plate is connected with a middle-layer guide plate 10, and the middle-layer guide plate is welded to the inner side of the separator cylinder.

[0029] Furthermore, the middle guide plate is a circular plate with evenly distributed through holes, and the sum of the cross-sectional areas of all the through holes must be larger than the cross-sectional area of ​​the refrigerant inlet. The middle guide plate not only has the functions of guiding and separating, but also serves as a back support and reinforcement for the impact plate.

[0030] Furthermore, the lower guide plate is a circular plate with a notch, the outer diameter of which matches the inner diameter of the separator cylinder, and which is welded to the inner side of the separator cylinder, and the notch is arranged on the outer circumferential surface of the circular plate, and is used to guide the refrigerant blocked by the impact plate. Thus, the liquid refrigerant flows into the lower layer and enters the system through the liquid refrigerant outlet pipe. At the same time, another key function of setting the lower guide plate is to guide the gas refrigerant from above to the middle and upper guide plates of the upper layer, thereby avoiding the impact of the high-pressure gas refrigerant on the liquid refrigerant surface of the lower layer, resulting in the instability of the liquid surface and affecting the monitoring data of the liquid level sensor.

[0031] Furthermore, the upper guide plate is a circular plate, on which evenly distributed through holes are opened, and the sum of the cross-sectional areas of all the through holes needs to be larger than the cross-sectional area of ​​the refrigerant inlet.

[0032] Furthermore, the positions of the circular holes of the upper guide plate and the middle guide plate are all staggered without overlap.

[0033] Furthermore, a filter screen 3 is provided between the upper guide plate and the upper end cover of the separator. The filter screen is made of stainless steel, and the height of the stainless steel filter screen is usually about 100 mm, and the mesh number of the filter screen is usually about 100 to 150. The height and mesh number of the filter screen can also be adjusted according to different working conditions.

[0034] Furthermore, a separator fixing piece 11 is arranged outside the separator cylinder and is welded to the separator cylinder. The size and quantity of the separator fixing piece can be adjusted according to different working conditions.

[0035] Furthermore, it is applied to the pre-separation system of the high-pressure section of the CO2 refrigeration unit, after the outlet of the air cooler and before the ejector.

[0036] During use, the refrigerant flowing from the air cooler to the separator enters the separator through the refrigerant inlet 5, and flows directly to the impact plate 6, so that the liquid naturally falls through the gaps around the lower guide plate 7, flows into the lower end cover 12 of the separator, and enters the pressure regulating valve through the liquid refrigerant outlet 13. The gas refrigerant passes through the lower guide plate 7, the middle guide plate 10 and the upper guide plate 4, through the filter screen 3, and enters the ejector from the gas refrigerant outlet 9. In this way, the gas and liquid in the refrigerant from the air cooler are separated, so that what enters the ejector is gas refrigerant, ensuring the efficiency of the ejector.

[0037] As an expandable implementation method, a liquid level sensor interface 8 is also provided on the separator cylinder 1. The liquid level sensor interface is arranged in the interval between the lower guide plate and the lower end cover of the separator, and is used to monitor the liquid level in the separator.

[0038] The present invention is located between the outlet of the air cooler and the high-pressure gas inlet of the ejector, and is applicable to the case where a parallel heat exchanger is configured or not configured. After the high-pressure CO2 gas passes through the air cooler, a small amount of CO2 liquid or mist gas will enter the high-pressure gas inlet of the ejector along the pipeline. A separator is set before the ejector to separate the gas and directly enter the high-pressure gas inlet of the ejector. The separated liquid or mist gas can be converted into liquid through a pressure regulating valve and enter the flash tank.

[0039] The present invention can separate the gas and liquid in the high-pressure section without losing any system energy efficiency, so that the refrigerant entering the high-pressure gas inlet of the ejector is in a gaseous state, thereby ensuring the efficiency of the ejector and thus ensuring the energy efficiency of the system.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 with 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 invention.

Claims

1. A separator for the high pressure section of a CO2 refrigeration unit, characterized in that: The separator cylinder comprises a refrigerant inlet provided on the outer wall of the separator cylinder, an impact plate provided at a position corresponding to the refrigerant inlet in the separator cylinder, an upper guide plate provided above the impact plate, a gas refrigerant outlet provided above the separator cylinder; a lower guide plate provided below the impact plate of the separator cylinder; A liquid refrigerant outlet is arranged below the lower guide plate.

2. The separator for the high pressure section of a CO2 refrigeration unit according to claim 1, characterized in that: A separator upper end cover is arranged above the separator cylinder, and a separator lower end cover is arranged below the separator cylinder. The gas refrigerant outlet is arranged on the separator upper end cover, and the liquid refrigerant outlet is arranged on the separator lower end cover.

3. The separator for the high pressure section of a CO2 refrigeration unit according to claim 1, characterized in that: The impact plate is arranged vertically, and a plurality of auxiliary guide plates are arranged on the side of the impact plate facing the refrigerant inlet, and the auxiliary guide plates are arranged in a herringbone shape. Specifically, each group of auxiliary guide plates forms a herringbone structure, and the two auxiliary guide plates on the left and right of each group are staggered in the height direction, and the cross section formed by all the auxiliary guide plates can completely cover the projection shape of the refrigerant inlet on the impact plate; The back side of the impact plate is connected with a middle-layer guide plate, and the middle-layer guide plate is welded to the inner side of the separator cylinder.

4. The separator for the high pressure section of a CO2 refrigeration unit according to claim 3, characterized in that: The middle guide plate is a circular plate, on which evenly distributed through holes are opened, and the sum of the cross-sectional areas of all the through holes must be larger than the cross-sectional area of ​​the refrigerant inlet.

5. The separator for the high pressure section of a CO2 refrigeration unit according to claim 1, characterized in that: The lower guide plate is a circular plate with a notch. The outer diameter of the lower guide plate matches the inner diameter of the separator cylinder. The lower guide plate is welded to the inner side of the separator cylinder. The notch is arranged on the outer circumferential surface of the circular plate to guide the refrigerant blocked by the impact plate.

6. The separator for the high pressure section of a CO2 refrigeration unit according to claim 1, characterized in that: The upper guide plate is a circular plate, on which evenly distributed through holes are opened, and the sum of the cross-sectional areas of all the through holes must be larger than the cross-sectional area of ​​the refrigerant inlet.

7. The separator for the high pressure section of a CO2 refrigeration unit according to claim 3, characterized in that: The circular hole positions of the upper guide plate and the middle guide plate are all staggered without overlap.

8. The separator for the high pressure section of a CO2 refrigeration unit according to claim 1, characterized in that: A filter screen is arranged between the upper guide plate and the upper end cover of the separator, and the mesh number of the filter screen is 100-150 meshes.

9. The separator for the high pressure section of a CO2 refrigeration unit according to claim 1, characterized in that: The separator used in the high pressure section of the CO2 refrigeration unit is used in the pre-separation system of the high pressure section of the CO2 refrigeration unit after the outlet of the air cooler and before the ejector.

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