Annular nozzle structure of oil diffusion pump

Abstract

The invention belongs to the technical field of oil diffusion pumps, 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 steam channel is formed in the pump core assembly. An air exhaust channel is arranged between the pump shell assembly and the pump core assembly; the air exhaust channel is communicated with the air suction port and the air outlet; the annular nozzle structure is arranged on the radial outer side of the pump core assembly and communicates with the steam channel, and an outlet of the annular nozzle structure is formed in the air exhaust channel and inclines downwards. An inner channel and an outer channel are arranged on the inner side and the outer side of an outlet of the annular nozzle structure respectively so that air can be sucked at the same time through the inner channel and the outer channel. According to the scheme, two air suction surfaces can be formed at the outlet of the annular nozzle structure, so that the air suction rate, the air suction amount and the air suction pressure intensity range of the oil diffusion pump are effectively increased; and the air exhaust stability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil diffusion pumps, and in particular relates to an annular nozzle structure of an oil diffusion pump. Background Art

[0002] The oil diffusion pump is a vacuum device that uses the jet of low-pressure, high-speed and directional oil vapor to evacuate. Its principle is to eject high-speed airflow through nozzles at various levels, and use low-pressure, high-speed and directional oil vapor to make the pumped gas diffuse and be compressed in the oil vapor flow, thereby realizing the pumping process.

[0003] At present, most of the oil diffusion pumps on the market are mainly of a tower structure, which ejects high-speed airflow through nozzles at various levels to pump air step by step. The size of the suction surface at the nozzle determines the performance of the entire oil diffusion pump, such as the suction volume, suction rate, and suction pressure range. The existing tower-type oil diffusion pumps generally only pump air from the outside of the nozzle, which limits the suction surface and affects the suction volume, suction rate, and suction pressure range.

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

[0005] In order to solve the above problems existing in the prior art, the present invention provides an annular nozzle structure of an oil diffusion pump.

[0006] The technical solution adopted by the present invention is:

[0007] An annular nozzle structure of an oil diffusion pump, the oil diffusion pump comprises a pump housing assembly and a pump core assembly; the upper end of the pump housing assembly has an air inlet, and the lower side wall has an air outlet; the pump core assembly is arranged in the pump housing assembly; a steam channel is arranged in the pump core assembly; an air extraction channel is arranged between the pump housing assembly and the pump core assembly; the air extraction channel is connected to both the air inlet and the air outlet;

[0008] The annular nozzle structure is arranged on the radial outside of the guide tube of the pump core assembly; the annular nozzle structure is connected to the steam channel in the guide tube, and the outlet of the annular nozzle structure is arranged in the exhaust channel and inclined downward; an inner channel and an outer channel are respectively arranged on the inner and outer sides of the outlet of the annular nozzle structure; when the annular nozzle structure sprays air downward, air is sucked into the upper part of the exhaust channel through the inner channel and the outer channel.

[0009] As an alternative or supplement to the above-mentioned annular nozzle structure: the pump casing assembly includes a tubular pump casing and a pump chassis; the tubular pump casing is in a circular tube shape, the upper pipe opening of the tubular pump casing is open and forms the air intake port, and the lower pipe opening of the tubular pump casing is sealed and connected to the pump chassis; the air outlet is arranged on the lower side wall of the tubular pump casing.

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

[0011] As an alternative or supplement to the above-mentioned annular nozzle structure: a thermal insulation flow guide diffuser is also arranged on the outer wall of the pump core assembly, and the thermal insulation flow guide diffuser is arranged below the annular nozzle structure. An annular channel that is wide at the top and narrow at the bottom is formed between the thermal insulation flow guide 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 deflector ring, a spacer ring, a lower connecting ring and a lower deflector ring; the upper connecting ring is arranged above the lower connecting ring, and the inner edges of the two are connected to the pump core assembly, the spacer ring is connected between the upper connecting ring and the lower connecting ring, and an annular hole is arranged at the center of the spacer ring, and the annular hole connects the upper and lower parts of the annular nozzle structure; the upper deflector ring is connected to the outer edge of the upper connecting ring, and the lower deflector ring is connected to the outer edge of the lower connecting ring, and an outlet of the annular nozzle structure is formed between the upper deflector ring and the lower deflector ring.

[0013] As an alternative or supplement to the above-mentioned annular nozzle structure: the pump core assembly includes a guide cover and a guide tube; the guide cover is a conical structure that is small at the top and large at the bottom, and is arranged in the pump casing for transporting oil vapor when it rises; the guide tube is arranged above the guide cover, and a nozzle is arranged on the upper side wall of the guide tube, which is inclined toward the bottom of the exhaust channel, and the lower end is connected to the outer wall of the guide cover; the cover cavity inside the guide cover and the tube cavity of the guide tube are connected to each other, and together form the steam channel.

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

[0015] As an alternative or supplement to the above 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 annular nozzle structure: an oil return hole is provided on the conical cover section, and the oil return hole is located at the lower end of the guide tube.

[0017] The beneficial effects of the present invention are as follows: the annular nozzle structure in this scheme is a relatively independent structure extending outside the pump core assembly, so that the outlet of the annular nozzle structure can be separated from the pump core assembly, thereby forming two suction surfaces (i.e., the areas where the inner channel and the outer channel are diffused and compressed), effectively increasing the pumping rate and amount of the oil diffusion pump and the pumping pressure range; and improving the pumping stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

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

[0020] Figure 2 It 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 figure: 1-heating source; 2-pump chassis; 3-oil; 4-tubular pump casing; 5-air outlet; 6-air intake; 7-annular nozzle structure; 71-upper connecting ring; 72-upper baffle ring; 73-spacer ring; 74-lower connecting ring; 75-lower baffle ring; 8-insulating flow guide diffuser; 9-flow guide pipe; 91-upper baffle; 92-upper pipe section; 93-lower pipe section; 11-flow guide cover; 111-upper cover section; 112-conical cover section; 113-lower cover section; 114-oil return hole. DETAILED DESCRIPTION

[0023] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings. The described embodiments are only some of the embodiments, not all of them. Based on the embodiments in this solution, all other embodiments obtained by ordinary technicians in this field without making creative work 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 inlet 6 at its upper end and an air outlet 5 on its lower side wall; when vacuuming an external device, the air inlet 6 is connected to the external device, and the air outlet 5 is connected to the external environment through a pipeline.

[0027] The pump core assembly is arranged in the pump housing assembly; a vapor channel is arranged in the pump core assembly, and the oil 3 at the bottom of the pump housing assembly enters the vapor channel after being heated and evaporated, and flows upward. An air extraction channel is arranged 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 port 5, so that the air at the air intake port 6 can flow to the air outlet port 5 through the air extraction channel, thereby completing the air extraction.

[0028] The annular nozzle structure 7 is arranged on the radial outer side of the pump core assembly; the annular nozzle structure 7 is connected to the steam channel, and the nozzle of the annular nozzle structure 7 is arranged in the air extraction channel and tilted downward; when the annular nozzle structure 7 ejects the oil 3 vapor in the steam channel downward in the air extraction channel, it can extract the air in the upper part of the air extraction channel through diffusion and compression, so that the air in the air extraction channel flows from top to bottom. The power for ejecting the oil 3 vapor downward at the annular nozzle structure 7 comes from the pressure difference between the steam channel and the air extraction channel and the heating source.

[0029] An inner channel and an outer channel are respectively arranged on the inner and outer sides of the outlet of the annular nozzle structure 7; when the annular nozzle structure 7 sprays air downward, the upper part of the air extraction channel is sucked through the inner channel and the outer channel. 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 where the inner channel is diffused and compressed, and the other suction surface is the area where the outer channel is diffused and compressed, which effectively increases the suction rate and suction volume of the oil diffusion pump as well as the suction pressure range.

[0030] The pump housing assembly includes components such as a tubular pump housing 4 and a pump chassis 2; the tubular pump housing 4 is in the shape of a circular tube, the upper pipe opening of the tubular pump housing 4 is open and forms the air inlet 6, the lower pipe opening of the tubular pump housing 4 is sealed and connected to the pump chassis 2, and the pump chassis 2 can be a metal plate that generates heat under electromagnetic action. The pump chassis 2 cooperates with the tubular pump housing 4 to form an oil tank for accommodating the oil 3; a heating source 1 is provided below the pump chassis 2, and the heating source 1 is used to heat and evaporate the oil 3; the vapor channel is located above the oil tank so that the evaporated oil 3 enters 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 and increases the pressure in the vapor channel.

[0031] The air outlet 5 is arranged on the lower side wall of the tubular pump housing 4 to discharge the sucked air. A cooling coil is arranged on the outer wall of the tubular pump housing 4 to cool the oil vapor in the air extraction channel and condense the oil vapor into oil liquid to flow back into the oil tank.

[0032] A thermal insulation flow guide diffuser 8 is also provided on the outer wall of the pump core assembly. The thermal insulation flow guide diffuser 8 is in a conical ring shape. The outer diameter of the thermal insulation flow guide diffuser 8 increases continuously from the upper part to the lower part. The thermal insulation flow guide diffuser 8 is arranged below the annular nozzle structure 7. An annular channel that is wide at the top and narrow at the bottom is formed between the thermal insulation flow guide diffuser 8 and the inner wall of the tubular pump casing 4 of the pump casing assembly for pressurizing the airflow, thereby reducing the backflow phenomenon in the channel.

[0033] The annular nozzle structure 7 comprises an upper connecting ring 71, an upper baffle ring 72, a spacer ring 73, a lower connecting ring 74 and a lower baffle ring 75; the upper connecting ring 71 is arranged above the lower connecting ring 74, and the inner edges of the two are connected to the pump core assembly, the spacer ring 73 is connected between the upper connecting ring 71 and the lower connecting ring 74, and an annular hole is arranged at the center of the spacer ring 73, and the annular hole, as a part of the inner channel, connects the upper and lower parts of the annular nozzle structure 7. The spacer ring 73 can adopt a cross-sectional shape that can guide the airflow in the annular nozzle structure 7, the upper baffle ring 72 is connected to the outer edge of the upper connecting ring 71, the lower baffle ring 75 is connected to the outer edge of the lower connecting ring 74, and the outlet of the annular nozzle structure 7 is formed between the upper baffle ring 72 and the lower baffle 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. A plurality of 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 a part of the inner channel.

[0035] The pump core assembly includes a flow guide cover 11 and a flow guide pipe 9; the flow guide cover 11 is a conical structure with a small top and a large bottom, and is arranged in the tubular pump housing 4 for conveying oil vapor when it rises; the flow guide pipe 9 is arranged above the flow guide cover 11, and an upper nozzle is arranged on the upper end side wall of the flow guide pipe 9, and the upper nozzle is a nozzle inclined toward the bottom of the air extraction channel, and the lower end of the flow guide pipe 9 is connected to the outer wall of the flow guide cover 11. The cover cavity inside the flow guide cover 11 is connected to the tube cavity of the flow guide pipe 9, and together form the steam channel.

[0036] The guide cover 11 includes an upper cover section 111, a conical cover section 112 and a lower cover section 113; the upper cover section 111 is connected to the upper end of the conical cover section 112, the lower cover section 113 has a larger diameter than the upper cover section 111 and is connected to the lower end of the conical cover section 112; the lower pipe opening of the guide pipe 9 is sealed and connected to the outer wall of the conical cover section 112. The gap between the lower cover section 113 and the tubular pump housing 4 is matched to facilitate the liquid oil 3 to flow back to 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 arranged at the upper end of the upper pipe section 92. The upper baffle 91 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 the two, so that the gas in the steam channel flows to the annular nozzle structure 7.

[0038] An oil return hole 114 is provided on the conical cover section 112 , and the oil return hole 114 is located on the inner side of the lower end of the guide tube 9 ; the liquid oil 3 gathered between the guide tube 9 and the guide cover 11 can flow back into the oil tank through the oil return hole 114 .

[0039] The above embodiments are merely examples for the purpose of clarifying the description, and are not intended to limit the implementation methods; it is not necessary and impossible to list all implementation methods exhaustively. However, obvious changes or modifications derived therefrom are still within the scope of protection of the present technology.

Claims

1. An annular nozzle structure for an oil diffusion pump, characterized in that: The oil diffusion pump comprises a pump housing assembly and a pump core assembly; the upper end of the pump housing assembly is provided with an air intake port (6) and the lower side wall is provided with an air outlet port (5); the pump core assembly is arranged in the pump housing assembly; a steam channel is arranged in the pump core assembly; an air extraction channel is arranged between the pump housing assembly and the pump core assembly; the air extraction channel is communicated with the air intake port (6) and the air outlet port (5); The annular nozzle structure (7) is arranged radially outside the guide tube (9) of the pump core assembly; the annular nozzle structure (7) is connected to the steam channel in the guide tube (9), and the nozzle of the annular nozzle structure (7) is arranged in the air extraction channel and is inclined downward; an inner channel and an outer channel are respectively arranged on the inner and outer sides of the outlet of the annular nozzle structure (7); when the annular nozzle structure (7) sprays air downward, air is sucked into the upper part of the air extraction channel through the inner channel and the outer channel.

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

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

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

5. The annular nozzle structure of the oil diffusion pump according to any one of claims 1 to 4, characterized in that: The annular nozzle structure (7) comprises an upper connecting ring (71), an upper baffle ring (72), a spacer ring (73), a lower connecting ring (74) and a lower baffle ring (75); the upper connecting ring (71) is arranged above the lower connecting ring (74), the inner edges of the two are connected to the pump core assembly, the spacer ring (73) is connected between the upper connecting ring (71) and the lower connecting ring (74), an annular hole is arranged at the center of the spacer ring (73), and the annular hole 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), the lower baffle ring (75) is connected to the outer edge of the lower connecting ring (74), and the outlet of the annular nozzle structure (7) is formed between the upper baffle ring (72) and the lower baffle ring (75).

6. The annular nozzle structure of the oil diffusion pump according to claim 5, characterized in that: The pump core assembly comprises a flow guide cover (11) and a flow guide pipe (9); the flow guide cover (11) is a conical structure with a small top and a large bottom, and is arranged in the pump housing for conveying oil vapor when it rises; the flow guide pipe (9) is arranged above the flow guide cover (11), and a nozzle inclined toward the bottom of the air extraction channel is arranged on the upper end side wall of the flow guide pipe (9), and the lower end is connected to the outer wall of the flow guide cover (11); the cover cavity inside the flow guide cover (11) and the tube cavity of the flow guide pipe (9) are connected to each other, and together form the steam channel.

7. The annular nozzle structure of the oil diffusion pump according to claim 6, characterized in that: The air guide cover (11) comprises an upper cover section (111), a conical cover section (112) and a lower cover section (113); the upper cover section (111) is connected to the upper end of the conical cover section (112); the lower cover section (113) has a diameter greater than that of the upper cover section (111) and is connected to the lower end of the conical cover section (112); and the lower pipe opening of the air guide pipe (9) is sealedly connected to the outer wall of the conical cover section (112).

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

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

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