Roots blower shell assembly with countercurrent cooling flow adjustable device

Abstract

The utility model provides a Roots blower casing assembly with a countercurrent cooling flow adjustable device, which is provided with an outer casing, an exhaust pipeline is fixedly arranged at the lower end of the outer casing, an air inlet is arranged at the top end of the outer casing, and an air outlet is arranged at the bottom end of the outer casing. Counter-flow cooling holes are formed in the positions, close to the left side and the right side of the air outlet, of the lower end of the outer shell correspondingly, the two sides of each counter-flow cooling hole communicate with an inner cavity of the shell and the exhaust pipeline correspondingly, and a counter-flow air inflow adjusting block assembly is fixedly arranged in each counter-flow cooling hole and comprises a counter-flow air inflow adjusting block. The countercurrent air inflow adjusting block is located on the inner wall of the countercurrent cooling hole. The Roots blower solves the technical problems that when an existing Roots blower operates for a long time, the temperature in a machine shell of the Roots blower can be obviously increased, and especially the position, close to an air outlet, in the machine shell is prone to gas accumulation, so that the temperature of the area is too high. The Roots blower can be widely applied to Roots blowers.

Description

Technical Field

[0001] The utility model relates to a casing of a Roots blower, in particular to a Roots blower casing assembly with a countercurrent cooling flow adjustable device. Background Art

[0002] The Roots blower belongs to a positive displacement blower, and its working principle is to compress and transport gas by using two blade-shaped rotors to move relative to each other in a cylinder. The blower has a simple structure and is easy to manufacture, and is suitable for gas transportation and pressurization systems in low-pressure occasions.

[0003] When the blower operates for a long time, the temperature inside its casing will increase significantly. If the inside of the casing remains at a high temperature for a long time, it will directly reduce the service life of the impeller. Especially at the position near the air outlet inside the casing, since gas accumulation is likely to occur at this position, there is a higher requirement for cooling at this position. Summary of the Utility Model

[0004] In view of the above technical problems, the utility model provides a Roots blower casing assembly with a countercurrent cooling flow adjustable device. The Roots blower casing assembly with a countercurrent cooling flow adjustable device can effectively reduce the temperature inside the casing, especially can quickly reduce the temperature at the position near the air outlet inside the casing, avoid damaging the impeller due to the too high temperature inside the casing, and extend the service life of the blower.

[0005] To this end, the technical solution of the utility model is that a Roots blower casing assembly with a countercurrent cooling flow adjustable device is provided, which is provided with an outer casing. There is an inner cavity inside the outer casing. An exhaust pipe is fixedly provided at the lower end of the outer casing, and an exhaust passage hole penetrating left and right is provided inside the exhaust pipe;

[0006] An air inlet is provided at the top end of the outer casing, and an air outlet is provided at the bottom end of the outer casing. The air outlet is communicated with the exhaust passage hole;

[0007] Countercurrent cooling holes are respectively provided at the left and right sides near the air outlet at the lower end of the outer casing. The two sides of the countercurrent cooling holes are respectively communicated with the inner cavity of the casing and the left and right sides of the exhaust passage hole;

[0008] A countercurrent intake air volume adjusting block assembly is fixedly provided inside the countercurrent cooling hole. The countercurrent intake air volume adjusting block assembly includes a countercurrent intake air volume adjusting block, and the countercurrent intake air volume adjusting block is located at the inner wall position of the countercurrent cooling hole.

[0009] Preferably, the countercurrent cooling holes are located at a position near the upper end inside the exhaust pipe.

[0010] Preferably, mounting holes are provided at the outer side end of the outer casing at a position adjacent to the outside of the countercurrent cooling holes;

[0011] At the fixed rear end position of the countercurrent intake air volume regulating block, there is a countercurrent intake air volume regulating block fixing plate provided with mounting holes.

[0012] The countercurrent intake air volume regulating block assembly locks the countercurrent intake air volume regulating block fixing plate and the outer end of the outer casing through locking screws, and fits the countercurrent intake air volume regulating block against the inner wall position of the countercurrent cooling hole.

[0013] Preferably, the number of the countercurrent intake air volume regulating block assemblies is multiple, and the countercurrent intake air volume regulating blocks on the multiple countercurrent intake air volume regulating block assemblies are respectively fitted against the inner wall positions at the upper and lower ends of the countercurrent cooling hole.

[0014] Preferably, a chamfer is provided at the external connection position between the countercurrent intake air volume regulating block and the countercurrent intake air volume regulating block fixing plate.

[0015] Preferably, a plurality of longitudinally arranged flow dividing support plates are provided inside the countercurrent cooling hole, and the plurality of longitudinally arranged flow dividing support plates are arranged horizontally inside the countercurrent cooling hole to form a plurality of countercurrent cooling holes.

[0016] The structure of the countercurrent intake air volume regulating block is symmetrically arranged with the structures of the multiple countercurrent cooling holes.

[0017] Preferably, a longitudinally arranged strengthening support plate is provided at the middle position inside the exhaust pipe.

[0018] The beneficial effect of the present utility model is that by providing countercurrent cooling holes on the outer casing, when the gas enters the exhaust passage hole, a part of the gas will respectively flow back through the countercurrent cooling holes on both sides of the outer casing, enter the inner cavity of the casing, and cool down the inner cavity of the casing. Moreover, since the countercurrent cooling holes are located at the positions on the lower end of the outer casing near the left and right sides of the air outlet, the gas passing through the countercurrent cooling holes directly cools down the surrounding position of the air outlet, and the effect is obvious.

[0019] Meanwhile, since the gas is located at the air outlet end position of the impeller rotation, it will not cause unnecessary impact on the impeller. Instead, it can play a role in promoting the flow of the gas, which is more conducive to the flow of the gas around the air outlet and further reduces the overall temperature of the area. Description of the Drawings

[0020] Figure 1 is the front view of the present utility model;

[0021] Figure 2 is the front view of the present utility model with a partial sectional structure;

[0022] Figure 3 is the left view of the present utility model;

[0023] Figure 4It is a three-dimensional view of the countercurrent air intake adjustment block assembly in the present utility model;

[0024] Figure 5 It is the present utility model Figure 3 The enlarged view at position A in it;

[0025] Figure 6 It is the present utility model Figure 2 The enlarged view at position B in it.

[0026] Explanation of symbols in the figure:

[0027] 1. Outer housing; 101. Air inlet; 102. Air outlet; 103. Inner cavity of the housing; 104. Countercurrent cooling hole; 106. Shunt support plate; 2. Exhaust pipe; 201. Exhaust passage hole; 3. Reinforcing support plate; 4. Countercurrent air intake adjustment block assembly; 401. Countercurrent air intake adjustment block; 402. Fixed plate of the countercurrent air intake adjustment block; 404. Chamfer; 5. Locking screw; 6. Mounting hole. Specific implementation mode

[0028] The following further describes the present utility model in conjunction with embodiments.

[0029] Through Figures 1-6 It can be seen that the Roots blower housing assembly with a countercurrent cooling flow adjustable device is provided with an outer housing 1. An inner cavity 103 of the housing is arranged inside the outer housing 1. An impeller is installed in the inner cavity 103 of the housing. The two impellers rotate relatively and meshingly to drive gas transmission.

[0030] The exhaust pipe 2 is fixedly arranged at the lower end of the outer housing 1. An exhaust passage hole 201 that penetrates left and right is arranged inside the exhaust pipe 2.

[0031] The air inlet 101 is arranged at the top end of the outer housing 1, and the air outlet 102 is arranged at the bottom end of the outer housing 1. The air outlet 102 is communicated with the exhaust passage hole 201. After the gas enters from the air inlet 101, through the meshing rotation of the two impellers, the gas is transmitted to the air outlet 102, and then enters the exhaust passage hole 201, and finally enters the application pipeline.

[0032] On the left and right sides of the lower end of the outer casing 1 near the air outlet 102, there are respectively provided countercurrent cooling holes 104. The two sides of the countercurrent cooling holes 104 are respectively communicated with the inner cavity 103 of the casing and the left and right sides of the exhaust passage hole 201. When the blower operates for a long time, the temperature inside its casing will significantly increase. If the inside of the casing remains at a high temperature for a long time, it will directly reduce the service life of the impeller. Especially in the position near the air outlet inside the casing, since gas accumulation is likely to occur at this position, therefore, by providing the countercurrent cooling holes 104 on the outer casing 1, when the gas enters the exhaust passage hole 201, a part of the gas will respectively flow back through the countercurrent cooling holes 104 on both sides of the outer casing 1. And because the countercurrent cooling holes 104 are located on the left and right sides of the lower end of the outer casing 1 near the air outlet 102, the gas passing through the countercurrent cooling holes 104 directly cools the surrounding position of the air outlet 102 specifically, and the effect is obvious.

[0033] In addition, by arranging the countercurrent cooling holes 104 near the air outlet 102, it is also possible to reduce the disturbance of the flowing-back gas to the inner cavity 103 of the casing.

[0034] Specifically, if the countercurrent cooling holes 104 are arranged in the middle position or near the upper end of the outer casing 1, when the flowing-back gas on both sides enters the inner cavity 103 of the casing, it will cause relative impacts on both sides of the rotating impeller, increasing the rotating resistance of the impeller, and moreover, obvious wind noise will be generated. However, by arranging the countercurrent cooling holes 104 near the air outlet 102, when the flowing-back gas enters the inner cavity 103 of the casing, the gas is located at the air outlet end of the impeller rotation, which will not cause unnecessary impacts on the impeller. Instead, it can play a role in promoting the flow of the gas, which is more conducive to the flow of the gas around the air outlet 102 and further reduces the overall temperature of this area.

[0035] Inside the countercurrent cooling holes 104, there is fixedly provided a countercurrent air intake volume adjustment block assembly 4. The countercurrent air intake volume adjustment block assembly 4 includes a countercurrent air intake volume adjustment block 401, and the countercurrent air intake volume adjustment block 401 is located at the inner wall position of the countercurrent cooling holes 104.

[0036] The countercurrent cooling holes 104 are located near the upper end inside the exhaust pipe 2. On the one hand, it can avoid the additional installation of a connecting pipe between the countercurrent cooling holes 104 and the exhaust pipe 2, increasing the overall occupied area of the blower and the input cost. On the other hand, the gas in the exhaust pipe 2 can quickly flow back into the inner cavity 103 of the casing, and the cooling effect is obvious.

[0037] An installation hole 6 is provided at an outer adjacent position outside the outer end of the outer housing 1, at the rear end position of the countercurrent intake air volume adjustment block 401, a countercurrent intake air volume adjustment block fixing plate 402 is fixedly provided, an installation hole 6 is provided on the countercurrent intake air volume adjustment block fixing plate 402, and the countercurrent intake air volume adjustment block assembly 4 locks the countercurrent intake air volume adjustment block fixing plate 402 and the outer end of the outer housing 1 through a locking screw 5, so as to fit the countercurrent intake air volume adjustment block 401 to the inner wall position of the countercurrent cooling hole 104.

[0038] The number of the countercurrent intake air volume adjustment block assemblies 4 is multiple, and the countercurrent intake air volume adjustment blocks 401 on the multiple countercurrent intake air volume adjustment block assemblies 4 are respectively fitted to the inner wall positions of the upper and lower ends of the countercurrent cooling hole 104.

[0039] In the invention patent with the patent number: 202210593015.8 and the patent name: Method for calculating and determining the area and position of the countercurrent port of a Roots vacuum pump, for the calculation method of the countercurrent port area of the Roots vacuum pump, in combination with the actual transmission pressure of the gas of the blower, the area required for the countercurrent cooling port is calculated, and then, the installation quantity of the countercurrent intake air volume adjustment block assemblies 4 is adjusted, so as to ensure the gas flow entering from the countercurrent cooling hole 104. This calculation and operation method can not only effectively cool down the position area of the air outlet 201 in time, but also minimize the impact of the reflux gas on the inner cavity 103 of the housing, and finally realize the long-term efficient and stable operation of the blower.

[0040] A chamfer 404 is provided at the external connection position between the countercurrent intake air volume adjustment block 401 and the countercurrent intake air volume adjustment block fixing plate 402.

[0041] By providing the chamfer 404, the gas entering the countercurrent cooling hole 104 from the exhaust pipe 2 can be effectively diverted, and it can effectively avoid the formation of a turbulent flow of the reflux gas in the exhaust pipe 2 due to the structural interference of the countercurrent cooling hole 104 in the exhaust pipe 2, and impact on the exhaust pipe 2 and the connected components.

[0042] A plurality of longitudinally arranged flow dividing support plates 106 are provided inside the countercurrent cooling hole 104, and the plurality of longitudinally arranged flow dividing support plates 106 are arranged horizontally inside the countercurrent cooling hole 104 to form a plurality of countercurrent cooling holes 104, and the structure of the countercurrent intake air volume adjustment block 401 is symmetrically arranged with the structure of the plurality of countercurrent cooling holes 104.

[0043] The reflux gas passes through the countercurrent cooling hole 104 and is effectively depressurized by the plurality of flow dividing support plates 106, which can not only ensure the effective cooling of the inner cavity 103 of the housing by the reflux gas, but also reduce the impact intensity of the reflux gas on the inner cavity 103 of the housing.

[0044] In the middle position inside the exhaust duct 2, a longitudinally arranged reinforcing support plate 3 is provided. The function of the reinforcing support plate 3 is the same as that of the shunt support plate 106. The reinforcing support plate 3 belongs to the first stage of gas pressure relief, dividing the gas into two small exhaust ducts 2, and then entering the inner cavity 103 of the housing through the countercurrent cooling holes 104 to effectively cool down the corresponding position of the inner cavity 103 of the housing.

[0045] However, the above are only specific embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. Therefore, the replacement of equivalent components or equivalent changes and modifications made according to the scope of patent protection of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A Roots blower housing assembly with a countercurrent cooling flow adjustable device, characterized in that: There is an outer housing, and an inner cavity of the housing is provided inside the outer housing. An exhaust pipe is fixedly provided at the lower end of the outer housing, and an exhaust passage hole penetrating left and right is provided inside the exhaust pipe; An air inlet is provided at the top end of the outer housing, and an air outlet is provided at the bottom end of the outer housing. The air outlet is communicated with the exhaust passage hole; Countercurrent cooling holes are respectively provided at the left and right positions near the air outlet at the lower end of the outer housing. The two sides of the countercurrent cooling holes are respectively communicated with the inner cavity of the housing and the left and right positions of the exhaust passage hole; A countercurrent intake air volume adjustment block assembly is fixedly provided inside the countercurrent cooling hole. The countercurrent intake air volume adjustment block assembly includes a countercurrent intake air volume adjustment block, and the countercurrent intake air volume adjustment block is located at the inner wall position of the countercurrent cooling hole.

2. The Roots blower housing assembly with a countercurrent cooling flow rate adjustable device according to claim 1, characterized in that: The countercurrent cooling hole is located at a position near the upper end inside the exhaust pipe.

3. The Roots blower housing assembly with a countercurrent cooling flow rate adjustable device according to claim 2, characterized in that: The number of the countercurrent intake air volume adjustment block assemblies is multiple. The countercurrent intake air volume adjustment blocks on the multiple countercurrent intake air volume adjustment block assemblies are respectively attached to the inner wall positions at the upper and lower ends of the countercurrent cooling hole.

4. The Roots blower housing assembly with a countercurrent cooling flow rate adjustable device according to claim 3, characterized in that: Mounting holes are provided at the outer side end of the outer housing adjacent to the outer side of the countercurrent cooling hole; A countercurrent intake air volume adjustment block fixing plate is fixedly provided at the rear end position of the countercurrent intake air volume adjustment block, and mounting holes are provided on the countercurrent intake air volume adjustment block fixing plate; The countercurrent intake air volume adjustment block assembly locks the countercurrent intake air volume adjustment block fixing plate and the outer side end of the outer housing through a locking screw, and fits the countercurrent intake air volume adjustment block to the inner wall position of the countercurrent cooling hole.

5. The Roots blower housing assembly with a countercurrent cooling flow rate adjustable device according to claim 3, characterized in that: A chamfer is provided at the external connection position of the countercurrent intake air volume adjustment block and the countercurrent intake air volume adjustment block fixing plate.

6. The Roots blower housing assembly with a countercurrent cooling flow rate adjustable device according to claim 3, characterized in that: A plurality of longitudinally arranged flow dividing support plates are provided inside the countercurrent cooling hole. The plurality of longitudinally arranged flow dividing support plates are arranged horizontally inside the countercurrent cooling hole to form a plurality of countercurrent cooling holes; The structure of the countercurrent intake air volume adjustment block is symmetrically arranged with the structure of the plurality of countercurrent cooling holes.

7. The Roots blower housing assembly with a countercurrent cooling flow rate adjustable device according to claim 1, characterized in that: A longitudinally arranged reinforcing support plate is provided at the middle position inside the exhaust pipe.

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