Dry-type screw vacuum pump

Abstract

The utility model relates to the technical field of vacuum pumps, and discloses a dry type screw vacuum pump which comprises a shell, an air inlet and an air outlet are formed in the shell, a cooling pipe is arranged on the air inlet, supports are fixed to the two ends of the cooling pipe, and the supports are installed on the surface of the shell. Baffle plates are arranged on the inner wall of the cooling pipe at equal intervals, each baffle plate is in the shape that a circular arc is cut off from a disc, and a notch exists between each baffle plate and the inner wall of the cooling pipe. Heat dissipation fins are arranged on the outer side wall of the cooling pipe, and the heat dissipation fins are annular; a heat dissipation plate is arranged between every two heat dissipation fins, the two ends of the heat dissipation plate are fixedly connected with the side walls of the two adjacent heat dissipation fins respectively, and the bottom end of the heat dissipation plate is fixedly connected with the outer side wall of the cooling pipe; an air inlet valve is arranged at an inlet of the cooling pipe. High-temperature gas is cooled through cooperation of the gas inlet valve and the cooling pipe, it is ensured that the gas entering the shell is within the working temperature range of the vacuum pump, thermal deformation of the screw is avoided, normal vacuumizing of the vacuum pump is ensured, and the service life of the vacuum pump is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vacuum pump technical field, concretely is dry -type screw vacuum pump. BACKGROUND

[0002] The working temperature of dry -type screw vacuum pump usually requires not more than 80 DEG C, if the inlet temperature exceeds this range, need to take corresponding measures to ensure the stable operation of pump, if the inlet temperature is too high can lead to the screw component in the pump excessive wear and tear of deformation, influence the work of dry -type screw vacuum pump. The prior art is cooled to the body through the jacket cooling water, but needs to additionally equip water pump and heat exchanger, the structure is more complex, and the energy consumption is higher.

[0003] The patent application with the publication number CN221074631U is a kind of dry -type screw vacuum pump, pump body is connected with heat sink, heat sink includes total water outlet pipe, total water outlet pipe one end is connected with the water pump being arranged in water tank interior, total water outlet pipe other end is connected with first water outlet pipe and second water outlet pipe, first water outlet pipe and second water outlet pipe part of a few characters are respectively arranged in two screw interiors, first water outlet pipe and second water outlet pipe other part are arranged in the inner wall of pump body, first water outlet pipe and second water outlet pipe are connected with connecting pipe away from total water outlet pipe one end, connecting pipe other end is connected with refrigeration device. Although cooling water pipe is arranged in screw interior and pump body inner wall, but actual cooling area is limited, especially in screw interior, due to space limitation, cooling water pipe cannot cover screw surface comprehensively, to cause local overheating deformation. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem to provide a kind of structure, it is relatively simple, ensure that the gas in the shell of entering is in the working temperature range of vacuum pump, avoid the dry -type screw vacuum pump of screw heat deformation.

[0005] To solve the above technical problems, the utility model provides dry -type screw vacuum pump, including shell, be equipped with air inlet and exhaust port on shell, air inlet is provided with cooling pipe, and the both ends of cooling pipe are fixed with support, and support is installed on the surface of shell;Baffle is equidistantly arranged on the inner wall of cooling pipe, baffle is the shape of cutting off a circular arc on disc, and there is gap between baffle and the inner wall of cooling pipe;Radiating fin is arranged on the outer wall of cooling pipe, and radiating fin is annular;Radiating plate is arranged between every two radiating fins, and the side wall of the adjacent two radiating fins is fixedly connected at both ends of radiating plate, and the bottom end of radiating plate is fixedly connected with the outer wall of cooling pipe;Air inlet is provided with inlet valve at the inlet of cooling pipe.

[0006] By adopting the above technical scheme, high-temperature gas is cooled by inlet valve and cooling pipe cooperation, it is relatively simple, ensure that the gas in the shell of entering is in the working temperature range of vacuum pump, avoid the dry -type screw vacuum pump of screw heat deformation, ensure that vacuum pump can normally be pumped, improve the service life of vacuum pump.

[0007] Preferably, the cooling pipe is two half types, which is assembled by half pipe one and half pipe two.

[0008] By adopting the above technical scheme, it is convenient to install the baffle plates in the half pipe one and the half pipe two respectively.

[0009] Preferably, the height of the notch of the baffle plate is 20%-45% of the nominal diameter of the shell.

[0010] By adopting the above technical scheme, through the notch height of 20%-45% of the nominal diameter of the shell, the flow rate of the fluid through the notch is ensured to be close to the flow rate of the fluid flowing transversely through the pipe bundle.

[0011] Preferably, the notches of the baffle plates are arranged horizontally and vertically.

[0012] By adopting the above technical scheme, the baffle plates with horizontally and vertically arranged notches can guide the gas to flow back and forth in the shell, reduce the flow dead zone, make the fluid more uniformly distributed around the pipe bundle, and improve the utilization rate of the heat transfer area.

[0013] Preferably, the baffle plates are arranged on the inner walls of the half pipe one and the half pipe two at intervals.

[0014] By adopting the above technical scheme, the baffle plates are arranged at intervals to make the gas impact the pipe wall multiple times, increase the heat exchange area and time between the gas and the pipe wall, and improve the heat transfer efficiency.

[0015] Preferably, the heat dissipation plates are two, which are installed on the outer side walls of the cooling pipe in an axisymmetric manner.

[0016] By adopting the above technical scheme, the heat can be transmitted to the surrounding environment through the heat dissipation plates and the heat dissipation fins more quickly, which helps to improve the heat dissipation efficiency and also enhances the stability of the whole cooling pipe structure.

[0017] Preferably, the top surface of the support is in a circular arc shape, the top surface is attached to the outer side wall of the cooling pipe, and the bottom of the support is fixedly connected with the shell.

[0018] By adopting the above technical scheme, the top surface of the support is attached to the cooling pipe, which increases the contact area between the support and the cooling pipe, enhances the overall stability of the structure, and ensures the working stability of the vacuum pump.

[0019] Compared with the prior art, the utility model has the advantages of:

[0020] 1. The utility model discloses a cooling pipe for a high-temperature gas, which is composed of a half pipe one and a half pipe two.

[0021] 2. The utility model discloses through two heat dissipation plates of axial symmetry installation, make heat can be faster through heat dissipation plate and radiating fin transmission to the surrounding environment, help to improve the heat dissipation efficiency, can also enhance the stability of whole cooling pipe structure.

[0022] 3. The utility model discloses the arc shape of support top surface adopts and cooling pipe and is pasted, increases the contact area between support and cooling pipe, enhances the overall stability of structure, ensures the working stability of vacuum pump. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the structure schematic diagram of the utility model;

[0024] Figure 2 It is the baffle structure schematic diagram of the utility model;

[0025] Figure 3 It is the baffle installation schematic diagram of the utility model;

[0026] Figure 4 It is the heat dissipation plate installation schematic diagram of the utility model.

[0027] Figure number: 1. shell, 2. air inlet, 3. exhaust port, 4. cooling pipe, 5. support, 6. baffle, 7. gap, 8. radiating fin, 9. heat dissipation plate, 10. air inlet valve, 11. semicircular pipe one, 12. semicircular pipe two. DETAILED DESCRIPTION

[0028] As Figure 1 Shown, dry screw vacuum pump, including shell 1, be equipped with air inlet 2 and exhaust port 3 on shell 1, set up cooling pipe 4 on air inlet 2, cooling pipe 4 both ends are fixed with support 5, and support 5 is installed on the surface of shell 1;Cooling pipe 4 inner wall sets up baffle 6 at equal intervals.As Figure 2 Shown, baffle 6 shape is the shape of cutting a circular arc on disc. There is gap 7 between baffle 6 and cooling pipe 4 inner wall;Cooling pipe 4 outer side wall sets up radiating fin 8, and radiating fin 8 is annular;Two radiating fins 8 between setting heat dissipation plate 9, and heat dissipation plate 9 both ends are fixedly connected with the side wall of adjacent two radiating fins 8 respectively, and heat dissipation plate 9 bottom end and cooling pipe 4 outer side wall are fixedly connected;Cooling pipe 4 import place sets up air inlet valve 10. Baffle 6 can make gas in shell course multiple baffling, increase the contact opportunity of gas and cooling pipe 4, increase the contact time of gas and pipe wall, improve the cooling efficiency. The application is cooled to high-temperature gas through air inlet valve 10 and cooling pipe 4 cooperation, and the structure is relatively simple, and there is no water pump and heat exchanger energy consumption, ensure that the gas in shell 1 is in the working temperature range of vacuum pump, avoid the screw thermal deformation, ensure that vacuum pump can normally vacuumize, improve the service life of vacuum pump.

[0029] The cooling tube 4 is a two-part design, assembled from a first semicircular tube 11 and a second semicircular tube 12, which facilitates the installation of baffles 6 on the inner walls of the first semicircular tube 11 and the second semicircular tube 12 respectively. The first semicircular tube 11 and the second semicircular tube 12 are welded together.

[0030] like Figure 3 As shown, the height of the notch 7 in the baffle 6 is 20%-45% of the nominal diameter of the shell 1 to ensure that the fluid velocity when passing through the notch 7 is similar to that when flowing laterally through the tube bundle. The notches 7 of the baffle 6 are arranged horizontally up and down. The horizontally arranged baffle 6 with notches 7 can guide the gas to flow back and forth in the shell side, reduce the flow dead zone, make the fluid more evenly distributed around the tube bundle, and improve the utilization rate of the heat transfer area. The baffles 6 are arranged one on each of the inner walls of the first semicircular tube 11 and the second semicircular tube 12. The baffles 6 on the first semicircular tube 11 and the baffles 6 on the second semicircular tube 12 are spaced apart, forming an alternating arrangement of one above and one below, which allows the gas to impact the tube wall multiple times, increasing the heat exchange area and time between the gas and the tube wall, and improving the heat transfer efficiency.

[0031] like Figure 4 As shown, there are two heat sinks 9, which are axially symmetrically mounted on the outer wall of the cooling tube 4. This allows heat to be transferred to the surrounding environment more quickly through the heat sinks 9 and the heat dissipation fins 8, which helps to improve heat dissipation efficiency and also enhances the stability of the entire cooling tube 4 structure.

[0032] The top surface of the bracket 5 is arc-shaped and fits against the outer wall of the cooling tube 4. The bottom of the bracket 5 is fixedly connected to the housing 1. The fit between the top surface of the bracket 5 and the cooling tube 4 increases the contact area between the bracket 5 and the cooling tube 4, enhances the overall stability of the structure, and ensures the working stability of the vacuum pump.

[0033] During operation, high-temperature gas enters through the inlet valve 10 and flows into the cooling tube 4. Guided by the baffle plate 6, the gas moves up and down within the shell side. The heat of the gas is transferred through the cooling tube 4 to the heat dissipation fins 8 and the heat sink 9. The heat is then transferred to the surrounding environment through the heat sink 9 and the heat dissipation fins 8. After cooling, the gas enters the shell 1 through the inlet 2. The inlet valve 10 and the cooling tube 4 work together to cool the high-temperature gas, ensuring that the gas entering the shell 1 is within the operating temperature range of the vacuum pump, preventing the screw from deforming due to heat, ensuring that the vacuum pump can pump vacuum normally, and improving the service life of the vacuum pump.

[0034] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A dry screw vacuum pump comprising a housing (1), the housing (1) being provided with an air inlet (2) and an air outlet (3), characterized in that: The air inlet (2) is provided with a cooling pipe (4), both ends of the cooling pipe (4) are fixed with a support (5), the support (5) is installed on the surface of the shell (1); the inner wall of the cooling pipe (4) is provided with baffles (6) at equal intervals, the baffle (6) is in the shape of a disc with a circular arc cut off, there is a gap (7) between the baffle (6) and the inner wall of the cooling pipe (4); the outer side wall of the cooling pipe (4) is provided with a heat dissipation fin (8), the heat dissipation fin (8) is annular; heat dissipation plates (9) are arranged between two heat dissipation fins (8), both ends of the heat dissipation plate (9) are fixedly connected with the side walls of the two adjacent heat dissipation fins (8), the bottom end of the heat dissipation plate (9) is fixedly connected with the outer side wall of the cooling pipe (4); an air inlet valve (10) is arranged at the inlet of the cooling pipe (4).

2. Dry screw vacuum pump according to claim 1, characterized in that: The cooling pipe (4) is two half types, which is assembled by a half circular pipe one (11) and a half circular pipe two (12).

3. Dry screw vacuum pump according to claim 1, characterized in that: The height of the gap (7) of the baffle (6) is 20%-45% of the nominal diameter of the shell (1).

4. Dry screw vacuum pump according to claim 3, characterized in that: The gap (7) of the baffle (6) is arranged horizontally up and down.

5. The dry screw vacuum pump according to claim 2, characterized in that: The baffles (6) are arranged at intervals in the inner walls of the half circular pipe one (11) and the half circular pipe two (12).

6. The dry screw vacuum pump according to claim 1, characterized in that: The heat dissipation plates (9) are two, which are installed on the outer side wall of the cooling pipe (4) in axial symmetry.

7. The dry screw vacuum pump according to claim 1, characterized in that: The top surface of the support (5) is in the shape of a circular arc, the top surface is in contact with the outer side wall of the cooling pipe (4), and the bottom of the support (5) is fixedly connected with the shell (1).

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