High-pressure-difference-resistant roots pump

Abstract

The utility model discloses a high-pressure-difference-resistant roots pump which comprises a motor and a pump body, a rotor assembly is rotationally connected in the pump body, a containing cavity is formed in the position, corresponding to the rotor assembly, of the bottom of the pump body, a cooling pipe is arranged in the containing cavity, and the two ends of the cooling pipe penetrate out of the pump body to form an inlet and an outlet. An opening communicated with the containing cavity is formed in the inner wall of the pump body, the cooling pipe is arranged in the pump body, the temperature of the roots pump rotor can be cooled in time, the temperature of the roots pump rotor is reduced under the high-pressure working condition, the roots pump rotor is not prone to being blocked due to thermal expansion, and therefore the roots pump rotor stably operates under the high-pressure-difference working condition and is particularly suitable for single crystal smelting and other special working conditions.

Description

Technical Field

[0001] The utility model relates to the field of Roots pumps, in particular to a high pressure difference resistant Roots pump. Background Art

[0002] Roots vacuum pump, also known as Roots pump, is a variable displacement vacuum pump that has two blade-shaped rotors rotating synchronously in opposite directions. There is a small gap between the rotors and between the rotors and the inner wall of the pump casing, and they do not contact each other.

[0003] After searching, the Chinese patent with announcement number CN219101579U discloses a Roots pump, including a pump body, in which rotating shaft 1 and rotating shaft 2 are rotatably installed, one end of rotating shaft 1 is connected to the motor, and the other end of rotating shaft 1 and the corresponding end of rotating shaft 2 are connected to gears through expansion sleeves, and the two gears are meshed with each other; rotors are installed on rotating shaft 1 and rotating shaft 2 located in the inner cavity; and a jacket-type water cooling mechanism for cooling the gears is also installed on the pump body. Fixing the rotating shaft and gears by expansion sleeves solves the problems of difficult processing, assembly and maintenance, greatly improves production efficiency and product quality, and adopts jacket-type cooling to solve the problem of easy water leakage, improve cooling efficiency, save materials and processing time, and has a simple and beautiful appearance and convenient operation and maintenance.

[0004] However, in the actual working process, the temperature of the rotor will continue to rise under high pressure environment, and it is easy to get stuck due to thermal expansion. There is a phenomenon that the Roots pump rotor has unstable rotation in high temperature environment. Utility Model Content

[0005] In order to further improve the stable operation under high pressure difference conditions, the present application provides a Roots pump that can withstand high pressure difference.

[0006] The present application provides a high pressure differential resistant Roots pump, which adopts the following technical solution:

[0007] A high-pressure differential resistant Roots pump comprises a motor and a pump body, wherein a rotor assembly is rotatably connected to the pump body, an accommodating cavity is arranged at the bottom of the pump body corresponding to the rotor assembly, a cooling pipe is arranged in the accommodating cavity, two ends of the cooling pipe pass through the pump body to form an inlet and an outlet, and an opening communicating with the accommodating cavity is arranged on the inner wall of the pump body.

[0008] Optionally, three groups of cooling pipes are arranged at intervals along the width direction of the pump body, and the cooling pipes are extended along the axial direction of the rotor assembly.

[0009] Optionally, the cooling pipe includes a main cooling pipe and an auxiliary cooling pipe, the main cooling pipe is located in the middle of the pump body and between two auxiliary cooling pipes, the main cooling pipe is arranged in a spiral shape, and the auxiliary cooling pipe is arranged in a wave-like bend.

[0010] Optionally, the opening includes a first opening corresponding to the main cooling pipe, and a width and a length of the first opening are both greater than the main cooling pipe.

[0011] Optionally, the opening includes a second opening corresponding to the auxiliary cooling pipe, and a plurality of the second openings are arranged at intervals along the axial direction of the pump body.

[0012] Optionally, the pump body is further provided with an air inlet and an air outlet, the air inlet is opened at the top of the pump body, the air outlet is opened at the bottom of the pump body, the air outlet is connected to the accommodating cavity, and the main cooling pipe is located at the air outlet.

[0013] Optionally, the bottom wall of the accommodating cavity passes through the pump body to form a through opening, and the pump body has a bottom cover corresponding to the through opening to seal it, the bottom cover is detachably connected to the pump body, and the air outlet is opened on the bottom cover.

[0014] Optionally, the pump body includes a shell and side covers at both ends, the side covers are detachably connected to the shell, and the bottom of the side covers has supporting feet.

[0015] In summary, the present application includes at least one of the following beneficial technical effects:

[0016] 1. By setting a cooling pipe inside the pump body, the temperature of the Roots pump rotor can be cooled in time, so that the temperature of the Roots pump rotor is reduced when the inlet pressure is 2000Pa, and it is not easy to get stuck due to thermal expansion, so that it can run stably under high pressure difference conditions, especially suitable for special conditions such as single crystal smelting;

[0017] 2. The pump feet are set on the side cover, which makes the pump assembly more convenient, simplifies the structure of the pump body, reduces the manufacturing cost and production difficulty of the pump, and also greatly improves the overall rigidity;

[0018] 3. The installation cavity is connected with the air outlet. During the operation of the Roots pump, the gas flows through the main cooling pipe, which can take away the heat of the main cooling pipe in time. During use, the cooling medium enters through the inlet and is discharged through the outlet to realize the circulation cooling of the cooling medium, so that the cooling pipe is in a good cooling state. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall structural diagram of an embodiment of the present application.

[0020] Figure 2 It is a cross-sectional view of an embodiment of the present application.

[0021] Figure 3 It is a diagram of the internal structure of the pump body in the embodiment of the present application.

[0022] Figure 4 This is a bottom perspective structural diagram of an embodiment of the present application.

[0023] Description of reference numerals:

[0024] 1. Pump body; 2. Motor; 3. Rotor assembly; 4. Air inlet; 5. Shell; 6. Side cover; 7. End cover; 8. Gear box; 9. Accommodating chamber; 10. Inlet; 11. Outlet; 12. Main cooling pipe; 13. Auxiliary cooling pipe; 14. First opening; 15. Second opening; 16. Through port; 17. Bottom cover; 18. Air outlet; 19. Cover body; 20. Screws; 21. Support feet; 22. Mounting holes. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-4 This application is described in further detail.

[0026] The embodiment of the present application discloses a Roots pump that can withstand high pressure differential.

[0027] like Figure 1 and Figure 2 As shown, a high-pressure differential resistant Roots pump comprises a pump body 1 and a motor 2. Two rotor assemblies 3 rotate inside the pump body 1. An air inlet 4 is provided on the top of the pump body 1. The pump body 1 comprises a shell 5 in the middle and side covers 6 at both ends. An end cover 7 connecting the pump body 1 and the motor 2 is provided between the pump body 1 and the motor 2. A coupling connecting the rotor assembly 3 and the output shaft of the motor 2 is provided inside the end cover 7. An O-ring is provided at the connection between the end cover 7 and the motor 2 to achieve good sealing. A gear box 8 is provided at the end of the rotor assembly 3 away from the motor 2, and power transmission between the two rotor assemblies 3 is achieved by means of the gear box 8.

[0028] like Figure 2 , Figure 3 as well as Figure 4 As shown, a receiving cavity 9 is provided at the bottom of the pump body 1 corresponding to the rotor assembly 3, and a cooling pipe is provided in the receiving cavity 9. The cooling pipe is extended along the axis of the pump body 1, and both ends of the cooling pipe pass through the bottom of the pump body 1 to form an inlet 10 and an outlet 11. At the same time, an opening connected to the inside of the pump body 1 is opened on the top wall of the receiving cavity 9, so that in the actual working process, a cooling medium is introduced from the inlet 10 to flow through the cooling pipe. The cooling pipe adopts a copper pipe to improve the thermal conductivity. The cold air of the cooling pipe can be dissipated through the opening to achieve good cooling of the rotor assembly 3, so that the temperature of the Roots pump rotor is reduced when the inlet pressure is 2000Pa, and it is not easy to get stuck due to thermal expansion, so that it can stably operate under high pressure difference conditions, which is particularly suitable for special conditions such as single crystal smelting; in this embodiment, a cooling pipe for cooling the internal oil of the gear box 8 is also provided.

[0029] like Figure 3As shown, in this embodiment, the cooling pipe includes a main cooling pipe 12 and auxiliary cooling pipes 13 on both sides. The main cooling pipe 12 is spirally arranged along the axial direction of the pump body 1, and the auxiliary cooling pipe 13 is bent in a wave shape along the axial direction of the pump body 1. The opening includes a first opening 14 and a second opening 15. The first opening 14 is located in the middle of the pump body 1 and corresponds to the connection between the two rotor assemblies 3. The temperature at the connection between the two rotor assemblies 3 is usually higher and requires better and more timely cooling. Therefore, in this embodiment, the first opening 14 is arranged in a rectangular shape as a whole. The width and width of the first opening 14 are both larger than the main cooling pipe 12, so that the main cooling pipe 12 can achieve a better cooling effect. The position of the second opening 15 corresponds to the auxiliary cooling pipe 13. Multiple second openings 15 are arranged at intervals along the axial direction of the pump body 1. In this way, the cooling of the auxiliary cooling pipe 13 can cool the rotor assembly 3 through the second opening 15 while maintaining the structural strength of the pump body 1 well, thereby reducing the impact on the overall structural strength of the pump body 1.

[0030] like Figure 2 and Figure 4 As shown, the bottom of the accommodating cavity 9 passes through the pump body 1 to form a through opening 16, and a bottom cover 17 for sealing the through opening 16 is provided. The bottom cover 17 is detachably connected to the pump body 1 by screws 20. An air outlet 18 connected to the inside of the pump body 1 is provided at the center of the bottom cover 17. The air inlet 4 and the air outlet 18 are both provided with a cover body 19 detachably connected thereto. The cover body 19 and the pump body 1, as well as the cover body 19 and the bottom cover 17 are fixed by screws 20. The setting position of the air outlet 18 corresponds to the main cooling pipe 12, that is, the main cooling pipe 12 is located at the air outlet 18, so that during the specific working process, the gas circulation can improve the fluidity of the airflow around the main cooling pipe 12, and can also partially take away part of the heat in the pump body 1, so that the main cooling pipe 12 maintains good cooling performance.

[0031] like Figure 1 and Figure 4 As shown, the side covers 6 on both sides of the shell 5 are detachably connected to the shell 5 by screws 20. At the same time, support feet 21 for support are arranged at the bottom of the side covers 6. The support feet 21 are provided with mounting holes 22 for installation. The bottom wall of the support feet 21 is lower than the bottom wall of the bottom cover 17. In this way, the support feet 21 are changed from being traditionally arranged on the pump body 1 to being arranged on the side covers 6, which makes the pump assembly more convenient, simplifies the structure of the pump body 1, reduces the manufacturing cost and production difficulty of the pump, and greatly improves the overall rigidity.

[0032] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A Roots pump capable of withstanding high differential pressure, comprising a motor (2) and a pump body (1), wherein a rotor assembly (3) is rotatably connected to the pump body (1), characterized in that: A receiving cavity (9) is arranged at the bottom of the pump body (1) corresponding to the rotor assembly (3), a cooling pipe is arranged in the receiving cavity (9), two ends of the cooling pipe pass through the pump body (1) to form an inlet (10) and an outlet (11), and an opening communicating with the receiving cavity (9) is arranged on the inner wall of the pump body (1).

2. A Roots pump with high pressure differential resistance according to claim 1, characterized in that: The cooling pipes are arranged in three groups at intervals along the width direction of the pump body (1), and the cooling pipes are extended along the axial direction of the rotor assembly (3).

3. A Roots pump capable of withstanding high differential pressure according to claim 2, characterized in that: The cooling pipe comprises a main cooling pipe (12) and an auxiliary cooling pipe (13); the main cooling pipe (12) is located in the middle of the pump body (1) and between the two auxiliary cooling pipes (13); the main cooling pipe (12) is arranged in a spiral shape, and the auxiliary cooling pipe (13) is arranged in a wave-like bending shape.

4. A Roots pump capable of withstanding high differential pressure according to claim 3, characterized in that: The opening comprises a first opening (14) corresponding to the main cooling pipe (12), and the width and length of the first opening (14) are both greater than the main cooling pipe (12).

5. A Roots pump capable of withstanding high differential pressure according to claim 3, characterized in that: The openings include a second opening (15) corresponding to the auxiliary cooling pipe (13), and a plurality of the second openings (15) are arranged at intervals along the axial direction of the pump body (1).

6. A Roots pump capable of withstanding high differential pressure according to claim 3, characterized in that: The pump body (1) is also provided with an air inlet (4) and an air outlet (18); the air inlet (4) is opened at the top of the pump body (1), and the air outlet (18) is opened at the bottom of the pump body (1); the air outlet (18) is connected to the accommodating cavity (9), and the main cooling pipe (12) is located at the air outlet (18).

7. A Roots pump capable of withstanding high differential pressure according to claim 6, characterized in that: The bottom wall of the accommodating cavity (9) penetrates the pump body (1) to form a through opening (16); the pump body (1) has a bottom cover (17) corresponding to the through opening (16) for sealing the through opening; the bottom cover (17) is detachably connected to the pump body (1); and the air outlet (18) is provided on the bottom cover (17).

8. The high pressure differential resistant Roots pump according to claim 1, characterized in that: The pump body (1) comprises a shell (5) and side covers (6) at both ends; the side covers (6) are detachably connected to the shell (5); and the bottom of the side covers (6) is provided with supporting feet (21).

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