Annular nozzle structure of an oil diffusion pump

Abstract

The present application belongs to the technical field of oil diffusion pump, and particularly relates to an annular nozzle structure of an oil diffusion pump, which comprises a pump shell assembly and a pump core assembly; the pump core assembly is arranged in the pump shell assembly, and a vapor channel is arranged in the pump core assembly; a gas suction channel is arranged between the pump shell assembly and the pump core assembly; the gas suction channel is in communication with a gas suction port and a gas outlet; the annular nozzle structure is arranged on the radial outer side of the pump core assembly and is in communication with the vapor channel, and the outlet of the annular nozzle structure is arranged in the gas suction channel and is inclined downward; an inner channel and an outer channel are arranged on the inner side and the outer side of the outlet of the annular nozzle structure respectively, so that air is sucked through the inner channel and the outer channel simultaneously. The outlet of the annular nozzle structure can form two air suction surfaces, effectively increasing the air suction rate, the air suction amount and the air suction pressure range of the oil diffusion pump, and improving the air suction stability.

Description

Technical Field

[0001] This invention belongs to the field of oil diffusion pump technology, and specifically relates to an annular nozzle structure for an oil diffusion pump. Background Technology

[0002] An oil diffusion pump is a vacuum device that uses a jet of low-pressure, high-speed, and directional oil vapor to create a vacuum. Its principle is that a high-speed gas flow is ejected through nozzles at various stages, and the low-pressure, high-speed, and directional oil vapor causes the gas to be pumped to diffuse and be compressed within the vapor flow, thus achieving the pumping process.

[0003] Currently, most oil diffusion pumps on the market are of a single-tower structure, using nozzles to eject high-speed airflow for staged extraction. The size of the suction surface at each nozzle determines the pump's overall performance, including suction volume, suction rate, and suction pressure range. Existing tower-type oil diffusion pumps typically only extract air from the outside of the nozzles, limiting the suction surface and affecting suction volume, suction rate, and suction pressure range.

[0004] Therefore, it is necessary to design an annular nozzle structure for an oil diffusion pump that can achieve double-sided air intake. Summary of the Invention

[0005] To address the aforementioned problems in the existing technology, this solution provides an annular nozzle structure for an oil diffusion pump.

[0006] The technical solution adopted in this invention is as follows:

[0007] An annular nozzle structure for an oil diffusion pump, the oil diffusion pump comprising a pump housing assembly and a pump core assembly; the upper end of the pump housing assembly has an air intake port and the lower side wall has an air outlet port; the pump core assembly is disposed inside the pump housing assembly; a vapor channel is provided inside the pump core assembly; an air extraction channel is provided between the pump housing assembly and the pump core assembly; the air extraction channel is connected to both the air intake port and the air outlet port.

[0008] The annular nozzle structure is located on the radial outside of the guide tube of the pump core assembly; the annular nozzle structure is connected to the steam channel inside the guide tube, and the outlet of the annular nozzle structure is located in the suction channel and tilted downward; an inner channel and an outer channel are respectively provided on the inner and outer sides of the outlet of the annular nozzle structure; when the annular nozzle structure sprays air downward, it draws air into the upper part of the suction channel through the inner and outer channels.

[0009] As an alternative or supplement to the above-mentioned annular nozzle structure: the pump housing assembly includes a tubular pump housing and a pump base; the tubular pump housing is cylindrical, with the upper port of the tubular pump housing open to form the air intake port, and the lower port of the tubular pump housing sealed to the pump base; the air outlet is located on the lower side wall of the tubular pump housing.

[0010] As an alternative or supplement to the above-mentioned annular nozzle structure: the pump chassis and the tubular pump housing cooperate to form an oil tank for containing oil; a heating source is provided below the pump chassis, which is used to heat and evaporate the oil; a vapor channel is located above the oil tank so that the evaporated oil enters the vapor channel.

[0011] As an alternative or supplement to the above-mentioned annular nozzle structure: a heat-insulating and flow-guiding diffuser is also provided on the outer wall of the pump core assembly. The heat-insulating and flow-guiding diffuser is located below the annular nozzle structure. An annular channel with a wider upper section and a narrower lower section is formed between the heat-insulating and flow-guiding diffuser and the inner wall of the pump casing assembly for pressurizing the airflow.

[0012] As an alternative or supplement to the above-mentioned annular nozzle structure: the annular nozzle structure includes an upper connecting ring, an upper baffle ring, a partition ring, a lower connecting ring, and a lower baffle ring; the upper connecting ring is disposed above the lower connecting ring, and the inner edges of both are connected to the pump core assembly; the partition ring is connected between the upper connecting ring and the lower connecting ring, and an annular hole is provided at the center of the partition ring, which connects the upper and lower parts of the annular nozzle structure; the upper baffle ring is connected to the outer edge of the upper connecting ring, and the lower baffle ring is connected to the outer edge of the lower connecting ring, forming the outlet of the annular nozzle structure between the upper baffle ring and the lower baffle ring.

[0013] As an alternative or supplement to the above-mentioned annular nozzle structure: the pump core assembly includes a flow guide shroud and a flow guide tube; the flow guide shroud is a conical structure with a smaller upper part and a larger lower part, and is disposed inside the pump casing for conveying oil vapor when it rises; the flow guide tube is disposed above the flow guide shroud, and a nozzle inclined towards the lower part of the suction channel is disposed on the upper side wall of the flow guide tube, and the lower end is connected to the outer wall of the flow guide shroud; the shroud cavity inside the flow guide shroud and the tube cavity of the flow guide tube are interconnected and together form the vapor channel.

[0014] As an alternative or supplement to the above-mentioned annular nozzle structure: the flow guide includes an upper section, a conical section, and a lower section; the upper section is connected to the upper end of the conical section, and the lower section has a larger diameter than the upper section and is connected to the lower end of the conical section; the lower opening of the flow guide is sealed to the outer wall of the conical section.

[0015] As an alternative or supplement to the above-mentioned annular nozzle structure: the guide pipe includes an upper pipe section and a lower pipe section, the lower end of the upper pipe section is connected to the upper connecting ring, and the upper end of the lower pipe section is connected to the lower connecting ring.

[0016] As an alternative or supplement to the above-mentioned annular nozzle structure: an oil return hole is provided on the conical shroud section, and the oil return hole is located at the lower end of the guide pipe.

[0017] The beneficial effects of this invention are as follows: The annular nozzle structure in this solution is a relatively independent structure extending outside the pump core assembly, which allows the outlet of the annular nozzle structure to be separated from the pump core assembly, thereby forming two suction surfaces (i.e., the inner channel and the outer channel, which are diffused and compressed), effectively increasing the pumping speed, pumping volume, and pumping pressure range of the oil diffusion pump; and improving pumping stability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this scheme or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0019] Figure 1 This is a cross-sectional schematic diagram of the annular nozzle structure of the oil diffusion pump in this scheme;

[0020] Figure 2 This is a cross-sectional structural diagram of the fairing;

[0021] Figure 3 It is a cross-sectional structural diagram of the annular nozzle structure and the guide tube.

[0022] In the diagram: 1-Heating source; 2-Pump chassis; 3-Oil; 4-Tube pump casing; 5-Outlet; 6-Inlet; 7-Annular nozzle structure; 71-Upper connecting ring; 72-Upper baffle ring; 73-Spacing ring; 74-Lower connecting ring; 75-Lower baffle ring; 8-Insulated flow guide diffuser; 9-Flow guide pipe; 91-Upper baffle; 92-Upper pipe section; 93-Lower pipe section; 11-Flow guide shroud; 111-Upper shroud section; 112-Conical shroud section; 113-Lower shroud section; 114-Oil return hole. Detailed Implementation

[0023] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this solution without creative effort are within the protection scope of this solution.

[0024] Example 1

[0025] like Figures 1 to 3 As shown, the oil diffusion pump involved in this embodiment includes components such as a pump housing assembly and a pump core assembly.

[0026] The pump housing assembly has an air intake port 6 at the upper end and an air outlet 5 on the lower side wall. When evacuating an external device, the air intake port 6 is connected to the external device, and the air outlet 5 is connected to the external environment through a pipe.

[0027] The pump core assembly is housed within the pump housing assembly. A vapor channel is provided within the pump core assembly, through which the oil 3 at the bottom of the pump housing assembly, after heating and evaporation, enters and flows upwards. An air extraction channel is provided between the pump housing assembly and the pump core assembly; this channel connects to the intake port 6 and the outlet port 5, allowing air at the intake port 6 to flow through the extraction channel to the outlet port 5, thus completing the air extraction process.

[0028] The annular nozzle structure 7 is located radially outside the pump core assembly. The annular nozzle structure 7 communicates with the steam channel, and its nozzle is positioned within the suction channel and tilted downwards. When the annular nozzle structure 7 ejects the oil vapor 3 from the steam channel downwards into the suction channel, it can draw air from the upper part of the suction channel through diffusion and compression, thus causing the air in the suction channel to flow downwards. The force driving the oil vapor 3 downwards at the annular nozzle structure 7 comes from the pressure difference between the steam channel and the suction channel, and from a heating source.

[0029] An inner channel and an outer channel are respectively provided on the inner and outer sides of the outlet of the annular nozzle structure 7. When the annular nozzle structure 7 sprays air downwards, it draws air into the upper part of the suction channel through the inner and outer channels. Since the outlet of the annular nozzle structure 7 can be separated from the pump core assembly, two suction surfaces can be formed on the inner and outer sides of the outlet of the annular nozzle structure 7. One suction surface is the area of ​​diffusion and compression in the inner channel, and the other suction surface is the area of ​​diffusion and compression in the outer channel, which effectively increases the pumping speed, pumping volume, and pumping pressure range of the oil diffusion pump.

[0030] The pump casing assembly includes components such as a tubular pump casing 4 and a pump base 2. The tubular pump casing 4 is cylindrical, with its upper opening forming the suction port 6. The lower opening of the tubular pump casing 4 is sealed to the pump base 2, which can be a metal disc that heats up under electromagnetic influence. The pump base 2 and the tubular pump casing 4 cooperate to form an oil tank for containing oil 3. A heating source 1 is located below the pump base 2, which is used to heat and evaporate the oil 3. A vapor channel is located above the oil tank to allow the evaporated oil 3 to enter the vapor channel. When the heating source 1 heats the oil 3 in the oil tank, the evaporated oil 3 rises along the vapor channel, increasing the pressure in the vapor channel.

[0031] The air outlet 5 is located on the lower side wall of the tubular pump casing 4 to facilitate the discharge of the pumped air. A cooling coil is provided on the outer wall of the tubular pump casing 4 to cool the oil vapor in the air extraction channel and to condense the oil vapor into liquid oil that flows back into the oil tank.

[0032] A heat-insulating and flow-guiding diffuser 8 is also provided on the outer wall of the pump core assembly. The heat-insulating and flow-guiding diffuser 8 is conical and annular. The outer diameter of the heat-insulating and flow-guiding diffuser 8 increases continuously from the top to the bottom. The heat-insulating and flow-guiding diffuser 8 is located below the annular nozzle structure 7. An annular channel with a wider top and a narrower bottom is formed between the heat-insulating and flow-guiding diffuser 8 and the inner wall of the tubular pump casing 4 of the pump casing assembly, which is used for pressurizing the airflow and thereby reducing the backflow phenomenon in the channel.

[0033] The annular nozzle structure 7 includes an upper connecting ring 71, an upper deflector ring 72, a partition ring 73, a lower connecting ring 74, and a lower deflector ring 75. The upper connecting ring 71 is positioned above the lower connecting ring 74, and their inner edges are connected to the pump core assembly. The partition ring 73 connects the upper connecting ring 71 and the lower connecting ring 74, and an annular hole is provided at the center of the partition ring 73. This annular hole serves as part of the inner channel, connecting the upper and lower parts of the annular nozzle structure 7. The partition ring 73 can have a cross-sectional shape that guides the airflow in the annular nozzle structure 7. The upper deflector ring 72 is connected to the outer edge of the upper connecting ring 71, and the lower deflector ring 75 is connected to the outer edge of the lower connecting ring 74. The outlet of the annular nozzle structure 7 is formed between the upper deflector ring 72 and the lower deflector ring 75.

[0034] The spacer ring 73 is a connecting component between the upper connecting ring 71 and the lower connecting ring 74 of the annular nozzle structure 7. Several spacer rings 73 are evenly arranged in the circumferential direction of the upper connecting ring 71 and the lower connecting ring 74. The annular holes of the spacer ring 73 connect the upper and lower sides of the annular nozzle structure 7 so that it can be used as part of the inner channel.

[0035] The pump core assembly includes a flow guide shroud 11 and a flow guide pipe 9. The flow guide shroud 11 has a conical structure that is smaller at the top and larger at the bottom, and is disposed inside the tubular pump casing 4 for conveying rising oil vapor. The flow guide pipe 9 is disposed above the flow guide shroud 11, and an upper-stage nozzle is provided on the upper side wall of the flow guide pipe 9. The upper-stage nozzle is a nozzle that is inclined towards the lower part of the suction channel, and the lower end of the flow guide pipe 9 is connected to the outer wall of the flow guide shroud 11. The shroud cavity inside the flow guide shroud 11 and the tube cavity of the flow guide pipe 9 are interconnected and together form the vapor channel.

[0036] The flow guide shroud 11 includes an upper shroud section 111, a conical shroud section 112, and a lower shroud section 113. The upper shroud section 111 is connected to the upper end of the conical shroud section 112, and the lower shroud section 113 has a larger diameter than the upper shroud section 111 and is connected to the lower end of the conical shroud section 112. The lower opening of the flow guide pipe 9 is sealed to the outer wall of the conical shroud section 112. The lower shroud section 113 is fitted with the tubular pump housing 4 with a gap to allow the liquid oil 3 to flow back into the oil tank.

[0037] The guide pipe 9 includes an upper baffle 91, an upper pipe section 92, and a lower pipe section 93. The upper baffle 91 is disposed at the upper end of the upper pipe section 92 and can cooperate with the upper pipe section 92 to form an upper nozzle. The lower end of the upper pipe section 92 is connected to the upper connecting ring 71, and the upper end of the lower pipe section 93 is connected to the lower connecting ring 74. The upper pipe section 92 and the lower pipe section 93 are separated from each other, or a through hole is provided between them to facilitate the flow of gas in the steam channel to the annular nozzle structure 7.

[0038] An oil return hole 114 is provided on the conical shroud section 112. The oil return hole 114 is located on the inner side of the lower end of the guide pipe 9. The liquid oil 3 that accumulates between the guide pipe 9 and the guide shroud 11 can flow back into the oil tank through the oil return hole 114.

[0039] The above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation; it is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom remain within the scope of this technology.

Claims

1. An annular nozzle structure for an oil diffusion pump, characterized in that: The oil diffusion pump includes a pump housing assembly and a pump core assembly; the upper end of the pump housing assembly has an air intake port (6) and the lower side wall has an air outlet (5); the pump core assembly is disposed inside the pump housing assembly; a vapor channel is provided inside the pump core assembly; an air extraction channel is provided between the pump housing assembly and the pump core assembly; the air extraction channel is connected to the air intake port (6) and the air outlet (5); The annular nozzle structure (7) is located on the radial outside of the guide tube (9) of the pump core assembly; the annular nozzle structure (7) is connected to the steam channel inside the guide tube (9), and the nozzle of the annular nozzle structure (7) is located in the suction channel and tilted downward; an inner channel and an outer channel are respectively provided on the inner and outer sides of the outlet of the annular nozzle structure (7); when the annular nozzle structure (7) sprays air downward, it draws air into the upper part of the suction channel through the inner channel and the outer channel; The annular nozzle structure (7) includes an upper connecting ring (71), an upper baffle ring (72), a partition ring (73), a lower connecting ring (74), and a lower baffle ring (75). The upper connecting ring (71) is located above the lower connecting ring (74), and their inner edges are connected to the pump core assembly. The partition ring (73) is connected between the upper connecting ring (71) and the lower connecting ring (74). An annular hole is provided at the center of the partition ring (73), which connects the upper and lower parts of the annular nozzle structure (7). The upper baffle ring (72) is connected to the outer edge of the upper connecting ring (71), and the lower baffle ring (75) is connected to the outer edge of the lower connecting ring (74). The upper baffle ring (72) and the lower baffle ring (75) form the outlet of the annular nozzle structure (7).

2. The annular nozzle structure of the oil diffusion pump according to claim 1, characterized in that: The pump housing assembly includes a tubular pump housing (4) and a pump base (2); the tubular pump housing (4) is in the shape of a round tube, the upper pipe opening of the tubular pump housing (4) is open and forms the air intake (6), and the lower pipe opening of the tubular pump housing (4) is sealed and connected to the pump base (2); the air outlet (5) is provided on the lower side wall of the tubular pump housing (4).

3. The annular nozzle structure of the oil diffusion pump according to claim 2, characterized in that: The pump base (2) and the tubular pump casing (4) cooperate to form an oil tank for containing oil (3); a heating source (1) is provided below the pump base (2), which is used to heat and evaporate the oil (3); a steam channel is located above the oil tank so that the evaporated oil (3) enters the steam channel.

4. The annular nozzle structure of the oil diffusion pump according to claim 1, characterized in that: A heat-insulating and flow-guiding diffuser (8) is also provided on the outer wall of the pump core assembly. The heat-insulating and flow-guiding diffuser (8) is located below the annular nozzle structure (7). An annular channel with a wider upper section and a narrower lower section is formed between the heat-insulating and flow-guiding diffuser (8) and the inner wall of the pump casing assembly for pressurizing the airflow.

5. The annular nozzle structure of the oil diffusion pump according to any one of claims 1-4, characterized in that: The pump core assembly includes a flow guide shroud (11) and a flow guide pipe (9); the flow guide shroud (11) is a conical structure with a smaller top and a larger bottom, and is installed inside the pump casing for conveying oil vapor when it rises; the flow guide pipe (9) is located above the flow guide shroud (11), and the upper side wall of the flow guide pipe (9) is provided with a nozzle that is inclined towards the lower part of the suction channel, and the lower end is connected to the outer wall of the flow guide shroud (11); the shroud cavity inside the flow guide shroud (11) is connected to the cavity of the flow guide pipe (9) and together they form the steam channel.

6. The annular nozzle structure of the oil diffusion pump according to claim 5, characterized in that: The flow guide (11) includes an upper section (111), a conical section (112), and a lower section (113); the upper section (111) is connected to the upper end of the conical section (112), and the lower section (113) has a larger diameter than the upper section (111) and is connected to the lower end of the conical section (112); the lower port of the flow guide (9) is sealed to the outer wall of the conical section (112).

7. The annular nozzle structure of the oil diffusion pump according to claim 6, characterized in that: The guide pipe (9) includes an upper pipe section (92) and a lower pipe section (93). The lower end of the upper pipe section (92) is connected to the upper connecting ring (71), and the upper end of the lower pipe section (93) is connected to the lower connecting ring (74).

8. The annular nozzle structure of the oil diffusion pump according to claim 7, characterized in that: An oil return hole (114) is provided on the conical shroud section (112), and the oil return hole (114) is located at the lower end of the guide pipe (9).

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