A horizontal economizer

Abstract

The present invention discloses a horizontal economizer, comprising: a horizontal cylinder body, with a tangential inlet provided on the side wall at one end of the cylinder body; an inner inserted cylinder, the inlet end of the inner inserted cylinder is suspended, and an annular baffle is provided between the outlet end and the cylinder body; an anti-rotation plate, provided between the cylinder body and the baffle and located on the central plane of the cylinder body; a liquid accumulator, protruding from the cylinder body below the anti-rotation plate and communicating with the inner cavity of the cylinder body; a partition plate, provided below the outlet end of the inner inserted cylinder and located between the baffle and the downstream separation orifice plate assembly. It can apply various gas-liquid separation structures with a series of compact layouts, enabling the gas-liquid two-phase to complete gas-liquid separation in a relatively small space, reducing the space size of the economizer, increasing the flexibility of the economizer in system layout, thereby reducing the site space of negative-pressure refrigerant-related products, and at the same time reducing the refrigerant charge amount and system cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigeration, and particularly relates to an economizer. Background Art

[0002] Negative pressure refrigerants such as R1233zde have better refrigeration performance and environmental protection advantages, and have broad prospects for application in large commercial refrigeration equipment. However, under the same cooling capacity load, compared with common medium-pressure refrigerants such as R134a, the negative pressure refrigerant system is much larger than the system applicable to medium-pressure refrigerants. This requires consumers to provide a larger machine room space to match the larger-sized unit system, resulting in limited use of negative pressure refrigerant-related products.

[0003] The existing Chinese invention patent application "Flash economizer applicable to refrigeration units (Application No.: 201811338894.X)" discloses an economizer structure, which is a labyrinth structure and uses gravity to achieve the separation of gas-liquid two-phase. However, for a negative pressure refrigerant system, due to the large volume flow rate and high flow velocity in the container, only large-diameter liquid droplets can be separated by relying on gravity separation, and small-diameter liquid droplets are extremely easy to be entrained by the high-speed fluid to form air supplement with liquid, so other high-efficiency separation measures must be adopted.

[0004] The existing Chinese invention patent "Economizer and heat exchange system including the economizer (ZL201510739755)" discloses a vertical cyclone economizer. The vertical cyclone can perform efficient gas-liquid separation at the designed inlet flow rate, but the separation efficiency will decrease with the decrease of the inlet flow rate under partial load. In addition, the vertical arrangement of the economizer will increase the height of the cylinder body, which is not conducive to the assembly of the economizer in the system. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a horizontal economizer, which can achieve efficient separation of gas-liquid two-phase after the throttle valve, improve the refrigeration cycle efficiency; at the same time, it can apply a variety of series-connected and compactly arranged gas-liquid separation structures, so that the gas-liquid two-phase can complete gas-liquid separation in a relatively small space, reduce the space size of the economizer, increase the flexibility of the economizer in system layout, and further reduce the site space of negative pressure refrigerant-related products. At the same time, it reduces the refrigerant charge and system cost, which has important significance in the application of negative pressure refrigerant systems.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A horizontal economizer, characterized by comprising:

[0008] A horizontal cylinder body, with a tangential inlet provided on the side wall at one end of the cylinder body, and an exhaust port and a drain port provided at the other end of the cylinder body;

[0009] The interpolation cylinder has its inlet end suspended, and an annular baffle is radially arranged between its outlet end and the cylinder body.

[0010] The anti-rotation plate is arranged between the cylinder body and the baffle and is located on the central plane of the cylinder body.

[0011] The liquid accumulator protrudes from the cylinder body below the anti-rotation plate and communicates with the inner cavity of the cylinder body. The liquid accumulator is divided into two mutually connected baffle regions along the longitudinal direction of the cylinder body by the baffle.

[0012] The partition plate is arranged below the outlet end of the interpolation cylinder and is located between the baffle and the downstream separation orifice plate assembly. The exhaust port and the liquid discharge port are arranged on the cylinder body downstream of the partition plate and the separation orifice plate assembly.

[0013] Preferably, a gas baffle is arranged between the downstream of the separation orifice plate assembly and the bottom cover at the other end of the cylinder body.

[0014] Preferably, the gas baffle is radially arranged in the upper semi-circular region of the separation orifice plate assembly.

[0015] Preferably, a filter assembly is arranged downstream of the gas baffle.

[0016] The filter assembly is horizontally arranged in the upper semi-circular region of the separation orifice plate assembly. The filter assembly, the gas baffle and the cylinder body form a sealed space communicating with the exhaust port.

[0017] Preferably, the inner cavity of the cylinder body below the filter assembly communicates with the liquid discharge port.

[0018] Preferably, the opening area of the separation orifice plate assembly is distributed in the upper and lower parts of the partition plate along the height direction.

[0019] Preferably, along the longitudinal direction of the cylinder body, the head end of the liquid accumulator is flush with the anti-rotation plate, and the tail end of the liquid accumulator is flush or does not extend beyond the downstream end of the partition plate.

[0020] Preferably, the inlet is divided into a reduced-diameter section and a straight pipe section. The reduced-diameter section presents a contracted shape with an outer diameter larger than the inner diameter. The straight pipe section tangentially approaches the cylinder wall of the cylinder body as much as possible and leaves enough gas-liquid two-phase separation space in the rotation area.

[0021] Preferably, the interpolation cylinder is composed of an interpolation cylinder skirt and an interpolation cylinder straight pipe section, and the end where the interpolation cylinder skirt is located is suspended.

[0022] Preferably, the separation orifice plate assembly is composed of two-stage perforated plates. The openings of the two-stage perforated plates are arranged staggeredly, so that the liquid refrigerant is separated on the second perforated plate after hitting the small holes on the first perforated plate; the gaseous refrigerant escapes along the space between the two plates and enters the downstream space in the upper semi-circular region where the separation orifice plate assembly is located.

[0023] The horizontal economizer cylinder body of the present invention is divided into three regions in series along the length direction of the cylinder body to fully separate the two-phase refrigerant at the inlet, which are: Zone1 is the rotational separation zone, Zone2 is the impingement separation zone, and Zone3 is the wire mesh separation zone.

[0024] For the Zone1 separation zone: To achieve a better rotational effect, the inlet is divided into a variable diameter section and a straight pipe section. The variable diameter section is used to increase the flow rate of the refrigerant, enhance the rotational speed of the two-phase refrigerant, and improve the separation efficiency. The straight pipe section is as close as possible to the cylinder wall of the cylinder body and is tangent to the cylinder wall, leaving sufficient two-phase separation space in the rotational zone. The baffle is annular and is radially arranged between the inner insert cylinder and the cylinder wall of the cylinder body, serving the purpose of blocking the fluid flow, so that the fluid must pass through Zone1 to achieve the first-stage gas-liquid rotational separation.

[0025] The inner insert cylinder structure is composed of an inner insert cylinder skirt and an inner insert cylinder straight pipe section. The inner insert cylinder skirt prevents the liquid refrigerant falling on the outer wall of the inner insert cylinder straight pipe section from entering the interior of the inner insert cylinder, avoiding the re-entrainment of the separated liquid refrigerant by the gas flow.

[0026] The anti-rotation plate is fixed between the cylinder body and the baffle and is located on the central plane of the cylinder body. The liquid main refrigerant separated from the Zone1 region impinges on the anti-rotation plate and then enters the liquid accumulator. The liquid accumulator is located below the cylinder body and is communicated with the inner cavity of the cylinder body, and is also below the anti-rotation plate. -

[0027] For the Zone2 separation zone: The gaseous main refrigerant separated by the Zone1 separation zone flows into the Zone2 separation zone from the inner insert cylinder, and the liquid main refrigerant separated by the Zone1 separation zone flows into the Zone2 separation zone from the liquid accumulator. For the gaseous main refrigerant flowing out of the inner insert cylinder, it can be further separated by gravity in the Zone2 separation zone, and the gas passes through the separation orifice plate assembly and enters the Zone3 separation zone. For the liquid main refrigerant flowing out of the liquid accumulator, it impinges on the partition plate and then realizes a second impingement on the separation orifice plate assembly, and the separated gaseous refrigerant enters the Zone3 separation zone through the separation orifice plate assembly. Another function of the partition plate is to prevent the refrigerant flowing out of the liquid accumulator from being mixed again by the gaseous main refrigerant flowing out of the inner insert cylinder.

[0028] The separation orifice plate assembly structure of the Zone2 separation zone is composed of two-stage perforated plates, and the openings of the two-stage perforated plates are arranged staggeredly; the liquid refrigerant passes through the small holes on the first perforated plate and impinges on the second perforated plate to achieve separation; the gaseous refrigerant escapes along the space between the two plates and enters Zone3 at the upper part of the separation orifice plate assembly.

[0029] For the separation area of Zone 3: The enclosed space formed by the filter component, the gas baffle, and the cylinder can prevent liquid from entering the exhaust port, achieving further separation. In the filter component, the filter is installed horizontally, changing the horizontal flow of the gaseous refrigerant (flowing out from the separation area of Zone 2) to vertical flow, forming a baffle flow and improving the separation efficiency.

[0030] It should be noted that the above three separation areas are not all required to achieve complete gas-liquid separation. Those skilled in the art can select according to the dryness of the inlet of the economizer under the design conditions. For example, if the proportion of the inlet liquid refrigerant is relatively small, the structure of the separation area of Zone 3 can be not used (as shown in Figure 9 ), shortening the length of the cylinder, streamlining the structure of the horizontal economizer, and continuously reducing the refrigerant charge.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] The present invention designs an important component - the economizer applied in the two-stage compression system, which can achieve efficient separation of gas-liquid two-phase after the throttle valve, improving the refrigeration cycle efficiency. At the same time, applying a variety of series-compact layout gas-liquid separation structures can enable the gas-liquid two-phase to complete gas-liquid separation in a relatively small space, reducing the space size of the economizer, increasing the flexibility of the economizer in system layout, and at the same time reducing the refrigerant charge and system cost, which has important significance in the application of negative pressure refrigerant systems. Specifically as follows:

[0033] The present invention designs a horizontal cyclone structure, realizing gas-liquid two-phase separation by the horizontal cyclone method. The inlet adopts a gradually shrinking and accelerating structure, and the inner cylinder adopts a structure of anti-liquid creeping skirt, improving the separation efficiency. Compared with the vertical cyclone, it can reduce the height of the cylinder and is convenient for assembly on the unit.

[0034] In addition, a variety of gas-liquid separation structures and separation principles (cyclone separation, collision separation, wire mesh separation) are adopted to improve the separation efficiency.

[0035] At the same time, the present invention adopts a multi-stage separation structure in series; and can select the number of series according to the proportion of the applicable gas-liquid refrigerant, which is economical, convenient and widely applicable. Description of the Drawings

[0036] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0037] Figure 1 is the overall structure diagram of the horizontal economizer of the present invention.

[0038] Figure 2 is the schematic diagram of the functional partition of the horizontal economizer of the present invention.

[0039] Figure 3 is the overall side view of the horizontal economizer of the present invention.

[0040] Figure 4 This is the structural diagram of the interpolation cylinder of the present invention.

[0041] Figure 5 This is the schematic structural diagram of the flow inside the liquid accumulator of the present invention.

[0042] Figure 6 This is the structural diagram of the separation orifice plate assembly of the present invention.

[0043] Figure 7 This is the detailed diagram of the separation orifice plate assembly of the present invention.

[0044] Figure 8 This is the detailed diagram of the filter separation area of the present invention.

[0045] Figure 9 This is the structural diagram of another implementation scheme of the present invention. Detailed implementation manners

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] As Figure 1 shown, the horizontal economizer implemented according to the embodiment of the present invention mainly includes an inlet 1, a cylinder body 2, an anti-rotation plate 3, an interpolation cylinder 4, a baffle 5, a liquid accumulator 6, a partition plate 7, a separator orifice plate assembly 8, a gas baffle 9, an exhaust port 10, a filter screen assembly 11, and a liquid discharge port 12.

[0048] The gas-liquid two-phase refrigerant after the throttle valve enters the horizontal economizer cylinder body 2 from the tangential inlet 1 on the side wall at one end of the cylinder body. The gas-liquid two-phase rotates and separates in the cylinder body 2. Due to the density difference between the two-phase refrigerants, the gas phase, which accounts for the main refrigerant, is separated and occupies the central area of the cylinder body 2, and then passes through the interpolation cylinder 4, the separation orifice plate assembly 8, and the filter screen assembly 11 in sequence and is filtered into pure gaseous refrigerant, and enters the compressor from the exhaust port 10 on the upper side wall at the other end of the cylinder body. The liquid phase, which accounts for the main refrigerant, is separated to the cylinder wall surface, impacts the anti-rotation plate 3 near the anti-rotation plate 3 area and then enters the liquid accumulator 6, and then impacts the partition plate 7 and the orifice plate assembly 8 to further separate the gas and liquid. The separated gaseous refrigerant enters the compressor after passing through the filter screen assembly 11 and the exhaust port 10, and the liquid refrigerant flows out from the liquid discharge port 12 on the lower side wall at the other end of the cylinder body and enters the evaporator.

[0049] The horizontal economizer cylinder body 2 is divided into three regions along the length direction of the cylinder body to fully separate the two-phase refrigerant at the inlet, as Figure 2 described. Zone1 is the rotational separation zone, Zone2 is the impact separation zone, and Zone3 is the wire mesh separation zone.

[0050] For the Zone1 separation area: To achieve a better rotation effect, the inlet 1 is divided into a variable-diameter section 110 and a straight pipe section 120. As Figure 3 shown, the variable-diameter section 110 presents a contracted shape with an outer diameter larger than the inner diameter, which is used to increase the refrigerant flow rate, strengthen the rotation speed of the two-phase refrigerant, and improve the separation efficiency. The straight pipe section 120 is as close as possible to the cylinder wall of the cylinder 2 and is tangent to the cylinder wall, leaving enough space for the two-phase separation in the rotation area. The baffle 5 is annular and is radially arranged between the inner inserted cylinder 4 and the cylinder wall of the cylinder 2, serving the purpose of separating the two-phase flow.

[0051] As Figure 4 shown, the structure of the inner inserted cylinder 4 consists of an inner inserted cylinder skirt 41 and an inner inserted cylinder straight pipe section 42. As Figure 4 shown, the inner inserted cylinder skirt 41 prevents the liquid refrigerant falling on the outer wall of the inner inserted cylinder straight pipe section 42 from entering the interior of the inner inserted cylinder along the outer wall of the inner inserted cylinder straight pipe section 42, avoiding the re-entrainment of the separated liquid refrigerant by the gas flow.

[0052] The anti-rotation plate 3 is welded between the cylinder 2 and the baffle 5 and is located on the central plane of the cylinder 2. The liquid main refrigerant separated from the Zone1 area impacts the anti-rotation plate 3 and then enters the liquid accumulator 6. The liquid accumulator 6 is located below the cylinder 2 and is communicated with the inner cavity of the cylinder 2, and is also below the anti-rotation plate 3. The liquid accumulator 6 causes the fluid entering the liquid accumulator to form a cross-flow, as Figure 5 shown by the arrow flow direction in

[0053] For the Zone2 separation area: The gaseous main refrigerant separated by the Zone1 separation area flows into the Zone2 separation area from the inner inserted cylinder 4, and the liquid main refrigerant separated by the Zone1 separation area flows into the Zone2 separation area from the liquid accumulator 6. For the gaseous main refrigerant flowing out of the inner inserted cylinder 4, it can be further separated by gravity in the Zone2 separation area, and the gas passes through the separation orifice plate assembly 8 and enters the Zone3 separation area. As Figure 2 and 5 shown, the height setting of the partition 7 needs to meet the following conditions: it is located below the outlet end of the inner inserted cylinder 4, and at the same time, the opening area of the separation orifice plate assembly 8 is distributed in the upper and lower parts of the partition 7 along the height direction. Therefore, the liquid main refrigerant flowing out of the liquid accumulator 6 impacts on the partition 7 and then realizes a second impact on the separation orifice plate assembly 8. The separated gaseous refrigerant enters the Zone3 separation area through the separation orifice plate assembly 8. Another function of the partition 7 is to prevent the refrigerant flowing out of the liquid accumulator 6 from being mixed again by the gaseous main refrigerant flowing out of the inner inserted cylinder 4.

[0054] The structure of the separation orifice plate assembly 8 in the Zone2 separation area is as Figure 6 and 7As shown, the separation orifice plate assembly 8 is composed of two-stage orifice plates (the first perforated plate 81 and the second perforated plate 82), and the orifices of the two-stage orifice plates are arranged staggeredly; the liquid refrigerant impacts on the second perforated plate 82 through the small holes on the first perforated plate 81 to achieve separation; the gaseous refrigerant escapes along the space between the two plates and enters Zone 3 at the upper part of the separation orifice plate assembly 8.

[0055] For the separation zone of Zone 3: The enclosed space formed by the filter screen assembly 11, the gas baffle 9 and the cylinder body 2 can prevent liquid from entering the exhaust port to achieve further separation. As Figure 8 shown, in the filter screen assembly 11, the position of the filter screen 111 is positioned by the support plate 112 and installed on the support plate 112. The filter screen 111 is horizontally installed, changing the horizontal flow of the gaseous refrigerant (flowing out from the separation zone of Zone 2) into vertical flow to form a baffle flow, improving the separation efficiency. The thickness of the filter screen 111 is generally 20 - 100 mm.

[0056] It should be noted that three separation zones are selected in this embodiment. It is not necessary to use all three separation zones to achieve complete separation of the gas-liquid two-phase. Those skilled in the art can select according to the dryness of the inlet of the economizer under different design conditions. For example, if the proportion of the inlet liquid refrigerant is relatively small, the structure of the separation zone of Zone 3 can be omitted (such as Figure 9 the embodiment of omitting the gas baffle 9, not shown separately), shortening the length of the cylinder body 2, streamlining the structure of the horizontal economizer, and continuing to reduce the refrigerant charge.

[0057] Figure 9 Another embodiment with a gas baffle 9 in Zone 3. In this embodiment, a gas baffle 9 is provided behind the separation orifice plate assembly 8 instead of using the filter screen assembly 11. To a certain extent, it also shortens the length of the cylinder body 2, streamlines the structure of the horizontal economizer, and continues to reduce the refrigerant charge.

[0058] Other embodiments will not be elaborated. It should be understood that those skilled in the art can make improvements or transformations according to the above description, and all these improvements and transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. A horizontal economizer, characterized in that Comprising: A horizontal cylinder body, with a tangential inlet provided on the side wall at one end of the cylinder body, and an exhaust port and a liquid discharge port provided at the other end of the cylinder body; An inner inserted cylinder, with the inlet end of the inner inserted cylinder suspended, and an annular baffle provided radially between the outlet end and the cylinder body; An anti-rotation plate, provided between the cylinder body and the baffle and located on the central plane of the cylinder body; A liquid accumulator, protruding from the cylinder body below the anti-rotation plate and communicating with the inner cavity of the cylinder body. The liquid accumulator is divided into two interconnected baffle flow regions along the longitudinal direction of the cylinder body by the baffle; A partition plate, provided below the outlet end of the inner inserted cylinder and located between the baffle and the downstream separation orifice plate assembly. The exhaust port and the liquid discharge port are provided on the cylinder body downstream of the partition plate separation orifice plate assembly.

2. The horizontal economizer according to claim 1, wherein A gas baffle is provided between the downstream of the separation orifice plate assembly and the bottom cover at the other end of the cylinder body.

3. The horizontal economizer according to claim 1, characterized in that The gas baffle is provided in the upper semi-circular region of the separation orifice plate assembly.

4. The horizontal economizer according to claim 1, wherein A filter screen assembly is provided downstream of the gas baffle. The filter screen assembly is horizontally provided in the upper semi-circular region of the separation orifice plate assembly. The filter screen assembly is horizontally arranged. The filter screen assembly, the gas baffle and the cylinder body form a closed space communicating with the exhaust port.

5. The horizontal economizer according to claim 1, characterized in that The inner cavity of the cylinder body below the filter screen assembly communicates with the liquid discharge port.

6. The horizontal economizer according to claim 1, wherein The opening area of the separation orifice plate assembly is distributed in the upper and lower parts of the partition plate along the height direction.

7. The horizontal economizer according to claim 1, characterized in that Along the longitudinal direction of the cylinder body, the head end of the liquid accumulator is flush with the anti-rotation plate, and the tail end of the liquid accumulator is flush or does not extend beyond the downstream end of the partition plate.

8. The horizontal economizer according to claim 1, wherein The inlet is divided into a reduced-diameter section and a straight pipe section. The reduced-diameter section presents a contracted shape with an outer diameter larger than the inner diameter. The straight pipe section tangentially approaches the cylinder wall of the cylinder body as much as possible and leaves enough gas-liquid two-phase separation space in the rotation area.

9. The horizontal economizer according to claim 1, wherein The inner inserted cylinder is composed of an inner inserted cylinder skirt and an inner inserted cylinder straight pipe section, and the end where the inner inserted cylinder skirt is located is suspended.

10. The horizontal economizer according to claim 1, characterized in that The separation orifice plate assembly is composed of two-stage perforated plates. The openings of the two-stage perforated plates are arranged staggeredly, so that the liquid refrigerant is impacted by the small holes on the first perforated plate and separated on the second perforated plate; the gaseous refrigerant escapes along the space between the two plates and enters the downstream space in the upper semi-circular region where the separation orifice plate assembly is located.

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