Cylinder body structure of screw rod dry type vacuum pump

Abstract

The utility model relates to the technical field of vacuum pumps, and discloses a cylinder body structure of a screw dry vacuum pump, which is characterized by comprising a pump shell, a cavity is formed in the pump shell, an air inlet is formed on the top surface of the pump shell, an air outlet is formed on the bottom surface of the pump shell, the air inlet and the air outlet are both communicated with the cavity, and an extension section is formed on the pump shell. The extending section reduces the size of an opening in the connecting position of the air outlet cavity and the cavity, namely, the size of the opening of the connecting opening is reduced, so that the width of the opening of the connecting opening is smaller than the inner diameter of the air outlet, and when the screw dry vacuum pump stops working, the extending section can shield impurities and reduce the impurities entering the cavity from the air outlet; the arc-shaped groove is located at the end, away from the air inlet, in the pump shell, the middle of the arc-shaped groove communicates with the air outlet cavity, air enters from the air inlet, flows towards one side of the air outlet after flowing through the cavity, and the annular groove plays a guiding role and guides the air flowing to the annular groove to the air outlet.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumps, and more particularly to a cylinder structure of a screw dry vacuum pump. Background Art

[0002] In a screw dry vacuum pump, a pair of screws are used to rotate synchronously at high speed in opposite directions in the pump housing to produce suction and exhaust. The screw dry vacuum pump can extract gases containing a large amount of water vapor and a small amount of dust, with a higher ultimate vacuum and lower power consumption.

[0003] The air inlet is set on the top surface of the pump casing, and the air outlet is set on the bottom surface of the pump casing, and the two are connected through the cavity inside the pump casing; when the screw dry vacuum pump is stopped, the inner diameter of the air outlet is large, causing impurities to enter the cavity through the air outlet. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a screw dry vacuum pump cylinder structure to overcome the above-mentioned defects in the prior art.

[0005] To achieve the above-mentioned purpose, the present utility model provides the following technical solutions: a screw dry vacuum pump cylinder structure, comprising a pump casing, a cavity formed in the pump casing, an air inlet opened on the top surface of the pump casing, an air outlet opened on the bottom surface of the pump casing, the air inlet and the air outlet both being connected to the cavity, an extension section formed on the pump casing, an air outlet cavity formed between the air outlet and the cavity, and the extension section partially shielding the connection between the air outlet cavity and the cavity.

[0006] As a further improvement of the present invention, an arc-shaped groove is formed in the pump housing, and the arc-shaped groove is communicated with the air outlet cavity.

[0007] As a further improvement of the present invention, an air intake cavity is formed between the air intake port and the cavity.

[0008] As a further improvement of the present invention, the connection between the air inlet cavity and the cavity is located at one end of the pump housing, and the connection between the air outlet cavity and the cavity is located at the other end of the pump housing.

[0009] As a further improvement of the present invention, a plurality of pillars are integrally formed on the top surface of the pump housing, and threaded holes are provided on the pillars.

[0010] As a further improvement of the present invention, a plurality of supporting feet are formed on the bottom surface of the pump housing.

[0011] As a further improvement of the present invention, a water inlet is provided on the top surface of the pump casing, a water outlet is provided on the bottom surface of the pump casing, a flow cavity is formed in the pump casing, and the water inlet and the water outlet are both connected to the flow cavity.

[0012] As a further improvement of the present invention, sealing ring grooves are provided at both the water inlet and the water outlet.

[0013] As a further improvement of the present invention, a plurality of heat dissipation ribs are provided outside the pump casing.

[0014] As a further improvement of the present invention, a pin hole is provided on one end of the pump housing connected to the motor.

[0015] The beneficial effects of the present invention are as follows: the extension section in the present invention reduces the size of the opening at the connection between the air outlet cavity and the cavity body, that is, reduces the size of the opening of the connection port, so that the opening width of the connection port is smaller than the inner diameter of the air outlet. When the screw dry vacuum pump stops working, the extension section can block impurities and reduce the impurities entering the cavity from the air outlet; the arc groove is located at the end of the pump casing away from the air inlet, and the middle part of the arc groove is connected to the air outlet cavity. The gas enters from the air inlet, flows through the cavity, and then flows toward the side of the air outlet. The annular groove plays a guiding role, guiding the gas flowing thereon to the air outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0017] Figure 2 This is a schematic structural diagram of the utility model from the bottom perspective;

[0018] Figure 3 It is a vertical cross-sectional view of the utility model;

[0019] Figure 4 This utility model Figure 3 Enlarged view of point A in the middle;

[0020] Figure 5 It is a transverse cross-sectional view of the utility model;

[0021] Figure 6 It is a schematic diagram of the internal structure of the flow chamber of the utility model.

[0022] Figure markings: 1. Pump casing; 11. Cavity; 12. Air inlet; 13. Air outlet; 14. Arc groove; 15. Support; 151. Threaded hole; 16. Support foot; 17. Water inlet; 18. Water outlet; 19. Flow cavity; 2. Extension section; 3. Air outlet cavity; 4. Air inlet cavity; 5. Sealing ring groove; 6. Heat dissipation rib; 7. Pin hole. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom," "top," "inner," and "outer" refer to directions toward or away from the geometric center of a particular component, respectively.

[0024] Reference Figures 1 to 6 As shown, a screw dry vacuum pump cylinder structure of the present embodiment includes a pump casing 1, a cavity 11 is formed in the pump casing 1, an air inlet 12 is provided on the top surface of the pump casing 1, and an air outlet 13 is provided on the bottom surface of the pump casing 1, the air inlet 12 and the air outlet 13 are both communicated with the cavity 11, an extension section 2 is formed on the pump casing 1, the extension section 2 and the pump casing 1 are integrally formed, an air outlet cavity 3 is formed between the air outlet 13 and the cavity 11, the extension section 2 blocks part of the connection between the air outlet cavity 3 and the cavity 11 to form a connection port, in the present embodiment, the extension section 2 extends from one end of the connection between the air outlet cavity 3 and the cavity 11 close to the air inlet 12, and the side of the extension section 2 is integrally formed with the side wall of the connection;

[0025] The extension section 2 reduces the size of the opening at the connection between the air outlet cavity 3 and the cavity 11, that is, reduces the size of the opening of the connection port, so that the opening width of the connection port is smaller than the inner diameter of the air outlet 13. When the screw dry vacuum pump stops working, the extension section 2 can block impurities and reduce the impurities entering the cavity 11 from the air outlet 13.

[0026] Reference Figures 2 to 5 As shown, an arcuate groove 14 is formed in the pump housing 1 , and the arcuate groove 14 is communicated with the air outlet cavity 3 .

[0027] The arcuate groove 14 is located at one end of the pump housing 1 away from the air inlet 12. The middle of the arcuate groove 14 is connected to the air outlet cavity 3. The gas enters from the air inlet 12, flows through the cavity 11, and flows toward the air outlet 13. The annular groove plays a guiding role, guiding the gas flowing on it to the air outlet 13.

[0028] The arc groove 14 can be regarded as two arc segments, the ends of the two arc segments close to each other are connected to the connection port, and the ends of the two arc segments away from each other extend along the inner wall of the pump housing 1 and are not connected.

[0029] Reference Figure 3 As shown, an air inlet cavity 4 is formed between the air inlet 12 and the cavity 11, so that the position of the connection between the air inlet 12 and the cavity 11 can be changed. In this embodiment, the connection between the air inlet cavity 4 and the cavity 11 forms an inlet, and the inlet is away from the air inlet 12 through the arrangement of the air inlet cavity 4, so that the distance between the inlet and the air outlet 13 is increased;

[0030] On the other hand, the position of the air inlet 12 can be changed so that the air inlet 12 can be moved to the middle of the pump housing 1, making it easier for the screw dry vacuum pump to be matched with a Roots pump.

[0031] Reference Figure 3 As shown, the connection between the air inlet cavity 4 and the cavity 11 is located at one end of the pump housing 1, and the connection between the air outlet cavity 3 and the cavity 11 is located at the other end of the pump housing 1, and the distance between the inlet and the connection port is increased as much as possible.

[0032] Reference Figure 1 、 Figure 2 As shown, the top surface of the pump housing 1 is integrally formed with a plurality of pillars 15, and threaded holes 151 are opened on the pillars 15. In this embodiment, six pillars 15 are provided, with two pillars 15 forming a group. The three groups of pillars 15 are arranged in parallel and are respectively located at one end, the middle part and the other end of the top of the pump housing 1;

[0033] The bracket can be connected via the support 15 and can be arranged between two screw dry vacuum pumps to achieve stacking.

[0034] A plurality of supporting legs 16 are formed on the bottom surface of the pump housing 1 . In this embodiment, there are four supporting legs 16 , which are respectively located at the four corners of the bottom surface of the pump housing 1 for supporting the pump housing 1 .

[0035] Reference Figure 1 、 Figure 2 and Figure 3 As shown, a water inlet 17 is provided on the top surface of the pump housing 1, a water outlet 18 is provided on the bottom surface of the pump housing 1, a flow cavity 19 is formed in the pump housing 1, the water inlet 17 and the water outlet 18 are both connected to the flow cavity 19, and the water inlet is connected to an external water tank, wherein the water tank is also connected to the water outlet 18, thereby realizing circulation;

[0036] Water enters the circulation cavity through the water inlet 17 and flows out from the water outlet 18, which can take away the heat on the pump housing 1, thereby dissipating the heat of the pump housing 1 and achieving a water-cooling effect.

[0037] Reference Figure 1 As shown, sealing ring grooves 5 are provided at the water inlet 17 and the water outlet 18. The setting of the sealing ring grooves 5 allows the connection seal between the water inlet 17 and the water outlet 18 and the water tank to be achieved through a sealing ring, thereby avoiding the use of sealant and allowing repeated disassembly and assembly.

[0038] A plurality of heat dissipation ribs 6 are provided on the outside of the pump casing 1, wherein the heat dissipation ribs 6 are provided at positions on the pump casing 1 where no circulation cavity exists, thereby dissipating heat from the pump casing 1 which is not water-cooled, increasing the heat dissipation of the pump casing 1 and improving the heat dissipation efficiency.

[0039] A pin hole 7 is provided on one end of the pump casing 1 connected to the motor, wherein two pin holes 7 are provided. A flange is provided on one end of the pump casing 1 connected to the motor, and the pin holes 7 are provided on the flange. When the flange is fixedly connected to the motor, it can be positioned through the pin holes 7, thereby facilitating bolt connection installation.

[0040] The above are only preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A screw dry vacuum pump cylinder structure, characterized by: The invention comprises a pump housing (1), wherein a cavity (11) is formed in the pump housing (1), an air inlet (12) is provided on the top surface of the pump housing (1), and an air outlet (13) is provided on the bottom surface of the pump housing (1), wherein the air inlet (12) and the air outlet (13) are both connected to the cavity (11), an extension section (2) is formed on the pump housing (1), an air outlet cavity (3) is formed between the air outlet (13) and the cavity (11), and the extension section (2) blocks a portion of the connection between the air outlet cavity (3) and the cavity (11).

2. The screw dry vacuum pump cylinder structure according to claim 1, characterized in that: An arc-shaped groove (14) is formed in the pump housing (1), and the arc-shaped groove (14) is communicated with the air outlet cavity (3).

3. The screw dry vacuum pump cylinder structure according to claim 1, characterized in that: An air intake cavity (4) is formed between the air intake port (12) and the cavity (11).

4. The screw dry vacuum pump cylinder structure according to claim 3, characterized in that: The connection between the air inlet cavity (4) and the cavity (11) is located at one end of the pump housing (1), and the connection between the air outlet cavity (3) and the cavity (11) is located at the other end of the pump housing (1).

5. The screw dry vacuum pump cylinder structure according to claim 1, characterized in that: The top surface of the pump housing (1) is integrally formed with a plurality of pillars (15), and threaded holes (151) are provided on the pillars (15).

6. The screw dry vacuum pump cylinder structure according to claim 1, characterized in that: The bottom surface of the pump housing (1) is formed with a plurality of supporting feet (16).

7. The screw dry vacuum pump cylinder structure according to claim 1, characterized in that: The top surface of the pump housing (1) is provided with a water inlet (17), the bottom surface of the pump housing (1) is provided with a water outlet (18), a flow cavity (19) is formed in the pump housing (1), and the water inlet (17) and the water outlet (18) are both in communication with the flow cavity (19).

8. The screw dry vacuum pump cylinder structure according to claim 7, characterized in that: The water inlet (17) and the water outlet (18) are both provided with sealing ring grooves (5).

9. The screw dry vacuum pump cylinder structure according to claim 1, characterized in that: A plurality of heat dissipation ribs (6) are provided outside the pump housing (1).

10. The screw dry vacuum pump cylinder structure according to claim 1, characterized in that: A pin hole (7) is provided on one end of the pump housing (1) connected to the motor.

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