Air-cooled Roots type vacuum pump including intake flange

Abstract

An air-cooled Roots-type vacuum pump including an intake flange is provided. The present invention comprises an air-cooled Roots-type vacuum pump body (1), a cold air return pipe, and at least one intake flange (100) located between the pump body and the cold air return pipe. The cold air return pipe is used to inject the cold air return into the pump body through the intake flange. The intake flange includes a rectangular connecting flange 3 having an opening formed therein, through which the return cold air flows into the pump body; a connecting pipe 4 having one end connected to the outer edge of the opening of the rectangular connecting flange, the connecting pipe extending from the inside to the outside and having a flow space which is connected to the opening, the flow space having a streamlined gradation structure on the inner wall of the pipe line which reduces airflow resistance; and a circular connecting flange 5 connected to the other end of the connecting pipe and having a circular opening 51 formed therein, the circular opening, the flow space and the opening being connected to each other, the return cold air in the return cold air pipe flowing through the connecting pipe and passing through the rectangular connecting flange to enter the pump body.

Description

[Technical Field]

[0001] The present invention relates to a Roots vacuum pump, and more particularly to an air-cooled Roots vacuum pump including an intake flange. [Background technology]

[0002] Conventional Roots vacuum pumps have limitations: they cannot operate under atmospheric pressure, cannot operate in high-pressure differential environments, and cannot directly exhaust into the atmosphere. Conventional Roots vacuum pumps generate a large amount of heat when operated in high-pressure environments with large pressure differentials. If the rotors cannot dissipate the excess heat generated during operation, they expand excessively, causing the gaps between the rotors and the pump chamber to disappear and preventing them from starting. When the temperature inside the pump chamber of a Roots vacuum pump rises, it affects the overall gas extraction speed and vacuum level of the vacuum pump. The higher the temperature, the slower the overall gas extraction speed and vacuum level of the vacuum pump. Conventional Roots vacuum pumps use a conventional mechanical vacuum pump as a fore-pump, limiting their use and narrowing their range of application.

[0003] Air-cooled Roots vacuum pumps, also known as pre-cooled Roots vacuum pumps, draw in gas from above and exhaust from below. The exhaust port and the gas-liquid heat exchanger installed below use flexible corrugated pipe joints, and cold air returns are provided at the bottom of both sides of the pump. A portion of the gas exhausted by an air-cooled Roots vacuum pump is cooled by the heat exchanger and then returned to the pump chamber through a pipe to cool the fan blade rotor. The other portion of the gas is cooled by the heat exchanger and then exhausted directly to the atmosphere. Air-cooled Roots vacuum pumps are pre-cooled before exhausting. This function absorbs the heat generated by compression, ensuring the pump's thermal balance, keeping the fan blade rotor temperature within a reasonable range, and preventing excessive expansion of the fan blade rotor.

[0004] Air-cooled Roots vacuum pumps can start directly at atmospheric pressure and operate independently. They have a stable extraction speed curve even in high-pressure environments and significantly reduce intake time even in the low vacuum stage (low vacuum range). Air-cooled Roots vacuum pumps can operate normally and do not overheat even in environments with a high pressure difference of 8.7 x 104 Pa. When used alone and exhausting directly to the atmosphere, large air-cooled Roots vacuum pumps can achieve an ultimate pressure of around 1 x 104 Pa, and when connected in series, even lower ultimate pressures can be achieved. Air-cooled Roots vacuum pumps have the advantages of fast extraction speed, high load compatibility, short intake time, and low power consumption, making them the mainstream oil-free vacuum pump that exhausts directly to the atmosphere at a fast extraction speed.

[0005] Air-cooled Roots vacuum pumps typically use a three-blade rotor, with pump chamber volume elements 1 and 2 formed between the rotor blades and the pump body. When the rotor blades move, the pump chamber volume elements suddenly open the high-pressure cold air return to both sides. Because the high-pressure cold air returns at a fast speed, it generates a strong pressure pulse when it mixes with the low-pressure gas in the pump chamber volume element, causing a large impact on the low-pressure gas, resulting in louder airflow noise. When an air-cooled Roots vacuum pump is operated in a high pressure differential environment, the impact of the high-pressure cold air return on the low-pressure gas in the pump body volume element becomes even greater, resulting in louder airflow noise.

[0006] Reducing noise, improving the working environment, and promoting people's physical and mental health are of great significance. How to reduce the noise of air-cooled Roots vacuum pumps and how to improve the cooling effect of the cold air return have become issues that those working in the vacuum industry must solve.

[0007] The cold air return injection connection member of the prior art is a circular flange pipe connection member with equal diameters at both ends, which has a small contact area with the pump body and allows only a small amount of cold air to enter the pump chamber. This causes sudden loud airflow noise in the pump chamber during input, reducing the cooling effect. Summary of the Invention

[0008] The present invention has been made in view of the above circumstances, and its object is to provide an air-cooled Roots-type vacuum pump including an intake flange. [Means for solving the problem]

[0009] In order to achieve the above object, an air-cooled roots type vacuum pump including an intake flange according to one aspect of the present invention comprises: Air-cooled Roots type vacuum pump body, Cold air return pipe, At least one intake flange is located between the pump body and the cold air return pipe, and the cold air return pipe is used to inject the cold air return into the pump body through the intake flange; Here, the intake flange is a rectangular frame structure, a rectangular connection flange having an opening formed therein, through which the cold air return flows into the pump body; a connecting pipe, one end of which is connected to the outer edge of the opening of the rectangular connecting flange, the connecting pipe extending from the inside to the outside and having a flow path space, the flow path space communicating with the opening, the inner wall of the pipe of the connecting pipe having a streamlined gradation structure for reducing airflow resistance, allowing the cool air returning into the pump body to flow more smoothly, reducing the impact of the airflow, reducing airflow noise and achieving a high cooling effect; and a circular connection flange connected to the other end of the connecting pipe and having a front circular opening formed therein, wherein the circular opening, the flow path space, and the opening are interconnected, so that the cold air return in the cold air return pipe flows through the connecting pipe via the circular connection flange and passes through the rectangular connection flange to enter the pump body. [Effects of the Invention]

[0010] The present invention is configured as described above and therefore has the following advantages. The special structural design of the intake flange allows it to be spacious, streamlined, and eccentrically positioned, and it uses the buffering principle to store a large amount of the return cold air and evenly relax the airflow. The return cold air is buffered by the intake flange before entering the pump body, which reduces the strong pressure pulses that occur when the high-pressure return cold air communicates with the low-pressure gas in the pump body, reducing the noise during operation of the air-cooled Roots vacuum pump and improving the cooling effect.

[0011] At least the following points will become clear from the description and drawings to be described later. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a front view of an intake flange according to an embodiment of the present invention; [Figure 2] 1 is a rear view of an intake flange according to an embodiment of the present invention; [Figure 3] 1 illustrates one embodiment of an air-cooled Roots-type vacuum pump including an intake flange according to the present invention. [Figure 4] 1 is a connection diagram of an intake flange and a pump according to the present invention; [Figure 5] 1 is a side view showing the connection between the intake flange and the pump according to the present invention; [Figure 6] 1 illustrates one embodiment of an air-cooled Roots-type vacuum pump including an intake flange according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] The present invention will be described below through embodiments of the invention, but the following embodiments do not limit the invention according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0014] First, an example of a specific embodiment of an air-cooled roots-type vacuum pump including an intake flange according to the present invention will be described with reference to FIGS. 1 to 6. FIG.

[0015] In the air-cooled Roots vacuum pump including the intake flange according to the present invention, as shown in Figure 6, the intake flange (100) is connected between the air-cooled Roots vacuum pump body (1) and a cold air return pipe (11). The cold air return pipe (11) is used to inject cold air return (111) into the pump body (1) through the intake flange (100).

[0016] 1 and 2, the intake flange (100) includes the following components, each of which will be described below.

[0017] The rectangular connecting flange (3) is a rectangular frame structure and has an opening (31) formed therein, through which the cold air return (111) flows into the pump body (1).

[0018] One end of the connecting pipe 4 is connected to the outer edge of the opening 31 of the rectangular connecting flange 3. The connecting pipe 4 extends from the inside to the outside, and as shown in Figures 2 and 5, the entire connecting pipe 4 has a generally conical shape. The connecting pipe 4 has a flow path space 41, and the flow path space 41 and the opening 31 are connected to each other. The inner wall of the connecting pipe 4 is curved, and the curved portion transitions naturally and smoothly. This streamlined, gradually changing structure reduces airflow resistance and allows the cool return air 111 injected into the pump body 1 to flow more smoothly, thereby reducing airflow impact, reducing airflow noise, and improving the cooling effect.

[0019] A circular connection flange 5 is connected to the other end of the connecting pipe 4 and has a circular opening 51. The circular opening 51, the flow path space 41, and the opening 31 are interconnected, so that the return cold air 111 in the return cold air pipe 11 flows through the connecting pipe 4 via the circular connection flange 5 and passes through the rectangular connection flange 3 to enter the pump body 1.

[0020] Preferably, the overall width of the intake flange (100) (i.e., the distance from the bottom surface of the rectangular connecting flange (3) to the top surface of the circular connecting flange (5)) is 140 mm, and the width of the connecting pipe (4) is 95 mm.

[0021] Preferably, a rectangular interface 12 for accommodating the intake flange 100 is provided at the bottom of each pump body 1. As shown in Figure 4, the rectangular connecting flange 3 and the rectangular interface 12 of the pump body 1 are connected by M8 bolts. The rectangular connecting flange 3 of the intake flange 100 and the rectangular interface 12 of the pump body 1 are connected to each other, maximizing the flow area of ​​the return cold air 111 and ensuring that the return cold air 111 is injected evenly.

[0022] As shown in FIG. 5, the cold air return pipe (11) is disposed at the corresponding circular connection flange (5) of the intake flange (100), and the circular connection flange (5) of the intake flange (100) and the circular flange interface (not shown) of the cold air return pipe (11) are connected by an M10 bolt.

[0023] As shown in Figure 4, a rectangular ring groove 21 is formed on the outer edge of the rectangular interface 12 of the pump body 1 to accommodate the rectangular ring 2, and a sealing structure is formed between the rectangular connecting flange 3 and the pump body 1. The sealing effect of the rectangular ring is high and installation is easy.

[0024] As shown in Figure 4, the circular connection flange 5 is connected to the outer periphery of the cold air return pipe 11, and an O-ring groove 23 is formed in the circular flange interface to accommodate an O-ring 22, forming a sealing structure between the circular connection flange 5 and the cold air return pipe 11. The O-ring seal provides a high sealing effect and is easy to install.

[0025] The flow area of ​​the opening (31) of the rectangular connecting flange (3) is 64125 mm 2 The flow area of ​​the circular opening (51) of the circular connecting flange (5) at the other end is 31400 mm 2 and the ratio of the flow areas of the two is 2. In this way, the flow velocity of the cold return air (111) at the rectangular connecting flange (3) of the intake flange (100) is lower than the flow velocity at the circular connecting flange (5), thereby reducing the impact of the high-pressure cold return air on the pump body (1) and enhancing the cooling effect. Preferably, the ratio of the flow area of ​​the opening (31) of the rectangular connecting flange (3) to the flow area of ​​the circular opening (51) of the circular connecting flange (5) is ≧1.5.

[0026] The center of the rectangular connecting flange (3) and the center of the circular connecting flange (5) have an eccentric distance of 30 mm, and the connecting pipe (4) is connected to the middle part. In this way, the storage amount of the cold return air (111) in the intake flange chamber is maximized, and since the storage amount of the cold return air (111) is large, there is a large buffer space, the impact of the air flow is reduced, the air flow noise is reduced, and the cooling effect is improved. In addition, dust deposited on the cold return air (111) is removed, and the cold return air (111) is kept clean.

[0027] Although the embodiment of the present invention has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design modifications and the like are also included within the scope of the present invention without departing from the gist of the present invention. [Explanation of symbols]

[0028] (1) Air-cooled Roots type vacuum pump body (2) Rectangular ring (3) Rectangular connection flange (4) Connecting pipe (5) Circular connection flange (11) Cold air return pipe (12) Rectangular Interface (22) O-ring (23) O-ring groove (31) Opening (41) Flow path space (51) Circular opening (100) Intake flange (111) Cold air return

Claims

1. An air-cooled roots type vacuum pump body (1), A cold air return pipe (11); at least one intake flange (100) located between the pump body (1) and the cold air return pipe (11), the cold air return pipe (11) being used to inject cold air return (111) into the pump body (1) through the intake flange (100); The intake flange (100) a rectangular frame structure, a rectangular connection flange (3) having an opening (31) formed therein, through which the cold air return (111) flows into the pump body (1); a connecting pipe (4) having one end connected to the outer edge of the opening (31) of the rectangular connecting flange (3), the connecting pipe (4) extending from the inside to the outside and having a flow path space (41), the flow path space (41) communicating with the opening (31), the inner wall of the pipe of the connecting pipe (4) having a streamlined gradation structure formed thereon to reduce airflow resistance and allow the cool return air (111) injected into the pump body (1) to flow more smoothly, thereby reducing the impact of the airflow, reducing airflow noise and improving the cooling effect; and a circular connection flange (5) connected to the other end of the connecting pipe (4) and having a circular opening (51) formed therein, wherein the circular opening (51), the flow path space (41), and the opening (31) are in communication with each other, so that the cold return air (111) in the cold return pipe (11) flows through the connecting pipe (4) via the circular connection flange (5) and passes through the rectangular connection flange (3) to enter the pump body (1).

2. 2. The air-cooled Roots-type vacuum pump with intake flange according to claim 1, characterized in that the ratio of the flow area of ​​the opening (31) of the rectangular connecting flange (3) to the flow area of ​​the circular opening (51) of the circular connecting flange (5) at the other end is 2, and the flow velocity of the cold return air (111) at the rectangular connecting flange (3) of the intake flange (100) is less than the flow velocity at the circular connecting flange (5), thereby reducing the impact of the high-pressure cold return air on the pump body (1) and simultaneously improving the cooling effect.

3. 2. The air-cooled Roots-type vacuum pump including an intake flange according to claim 1, wherein the ratio of the flow area of ​​the opening (31) of the rectangular connecting flange (3) to the flow area of ​​the circular opening (51) of the circular connecting flange (5) is ≧1.

5.

4. 2. The air-cooled Roots-type vacuum pump including an intake flange according to claim 1, wherein the central portion of the rectangular connecting flange (3) and the central portion of the circular connecting flange (5) have an eccentric distance.

5. 5. The air-cooled Roots-type vacuum pump including an intake flange according to claim 4, wherein the eccentric distance is 30 mm.

6. 2. The air-cooled Roots-type vacuum pump including an intake flange according to claim 1, wherein the entire connecting pipe (4) has a substantially conical structure.

7. 2. The air-cooled Roots type vacuum pump with intake flange according to claim 1, characterized in that a rectangular interface (12) for arranging the intake flange (100) is opened at the bottom of both sides of each pump body (1), and the rectangular connecting flange (3) and the rectangular interface (12) are connected by bolts to maximize the flow area of ​​the cold return air (111) and inject the cold return air (111) in a uniformly distributed manner.

8. 2. The air-cooled Roots vacuum pump including the intake flange according to claim 1, wherein the cold air return pipe (11) is disposed on the circular connection flange (5) of the intake flange (100), and the circular flange interface of the circular connection flange (5) of the intake flange (100) and the cold air return pipe (11) is connected by bolts.

9. 8. The air-cooled Roots-type vacuum pump with intake flange according to claim 7, wherein a rectangular ring groove (21) having a shape corresponding to the rectangular interface (12) for accommodating a rectangular ring (2) is formed on an outer edge of the rectangular interface (12) of the pump body (1), and a sealing structure is formed by the rectangular connection flange (3) and the pump body (1).

10. 2. The air-cooled Roots-type vacuum pump with intake flange according to claim 1, wherein the circular connection flange (5) is connected to the outer edge of the cold air return pipe (11), and an O-ring groove (23) having a shape corresponding to the circular flange interface for locating an O-ring (22) therein is formed, and a sealing structure is formed by the circular connection flange (5) and the cold air return pipe (11).

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