Roots blower casing with countercurrent cooling structure

Abstract

The utility model provides a Roots blower casing with a countercurrent cooling structure, which comprises an air inlet and an air outlet, a casing inner cavity is arranged inside the Roots blower casing, the air inlet and the air outlet are respectively communicated with the casing inner cavity, a driving rotor and a driven rotor are arranged in the casing inner cavity, and the driving rotor is connected with the driven rotor. The left side and the right side of the shell of the Roots blower are respectively provided with a countercurrent cooling channel, and the countercurrent cooling channels are communicated with an inner cavity of the shell. The Roots blower solves the problems that when an existing Roots blower runs, due to long-time high-speed rotation of a driving rotor and a driven rotor, the temperature in a machine shell of the Roots blower is obviously increased, when the interior of the machine shell is continuously in a high-temperature state, thermal expansion deformation of the driving rotor and the driven rotor is directly caused, and when the driving rotor and the driven rotor rotate, the temperature in the machine shell is reduced. The service lives of the driving rotor and the driven rotor are shortened, and the maintenance cost is increased. The Roots blower shell can be widely applied to Roots blower shells.

Description

Technical Field

[0001] The utility model relates to a Roots blower, in particular to a Roots blower casing with a counter-flow cooling structure. Background Art

[0002] Roots blower is a volumetric forced gas transmission equipment. Due to its simple structure, easy manufacturing, simple operation and long maintenance cycle, it is widely used in pneumatic transmission to achieve gas transportation and pressurization, and is applied to fields such as petroleum, chemical industry and power plants.

[0003] A driving rotor and a driven rotor are installed inside the casing of the Roots blower. The driving rotor and the driven rotor rotate synchronously in opposite directions, sucking the gas from the air inlet on the casing and then discharging it from the air outlet on the casing to realize the gas transportation process.

[0004] However, due to the long-term high-speed rotation of the active rotor and the driven rotor, the temperature inside the casing of the Roots blower increases significantly. When the inside of the casing is continuously in a high temperature state, it will directly cause thermal expansion and deformation of the active rotor and the driven rotor, and eventually cause mutual friction when the active rotor and the driven rotor rotate, shortening the service life of the active rotor and the driven rotor and increasing maintenance costs. Utility Model Content

[0005] In view of the above technical problems, the utility model provides a Roots blower casing with a counterflow cooling structure. The Roots blower casing with a counterflow cooling structure can avoid thermal expansion and deformation of the active rotor and the driven rotor when the blower is running by arranging counterflow cooling channels on both sides of the blower casing, thereby avoiding the problem of mutual friction between the active rotor and the driven rotor when the active rotor and the driven rotor rotate, extending the service life of the active rotor and the driven rotor, and reducing maintenance costs.

[0006] To this end, the technical solution of the utility model is a Roots blower casing with a countercurrent cooling structure, comprising an air inlet and an air outlet, wherein the air inlet is located at the lower end of the Roots blower casing, and the air outlet is located at the upper end of the Roots blower casing;

[0007] The interior of the Roots blower housing is provided with a housing cavity, and the air inlet and the air outlet are respectively connected to the housing cavity;

[0008] A driving rotor and a driven rotor are arranged in the inner cavity of the casing, a driving shaft is fixedly arranged at the center of the driving rotor and an axially penetrating driven shaft is fixedly arranged at the center of the driven rotor;

[0009] The left and right sides of the Roots blower casing are respectively provided with counterflow cooling channels, the counterflow cooling channels and the inner cavity of the casing are interconnected, the counterflow cooling channels include an outer air inlet channel, an intermediate compression channel and an inner air outlet channel, the intermediate compression channel is located in the middle of the counterflow cooling channel, the outer air inlet channel is located at the outer side of the counterflow cooling channel, and the inner air outlet channel is located at the inner side of the counterflow cooling channel;

[0010] The middle compression channel is a conical structure, and the middle compression channel gradually narrows from the outside to the inside;

[0011] The connection between the outer air inlet channel and the middle compression channel adopts a circular arc smooth transition, and the connection between the middle compression channel and the inner air outlet channel adopts a circular arc smooth transition.

[0012] Preferably, connecting seats are fixedly provided at the positions of the counterflow cooling channels on the left and right sides of the outer surface of the Roots blower housing, and the connecting seats extend outward along the outer surface of the Roots blower housing. A plurality of fixing holes are provided on the connecting seats, and the connecting seats are of a hollow structure. An air intake channel is provided in the middle position of the connecting seat, and the air intake channel is connected to the counterflow cooling channel.

[0013] Preferably, the outer surfaces of the left and right sides of the Roots blower housing are respectively fixed with reinforcing fixing plates, which are vertically arranged on the outer surface of the Roots blower housing, and vertically penetrate the connecting seat to divide the air intake channel into multiple channels.

[0014] Preferably, the counter-flow cooling channels are respectively located on the left and right sides of the Roots blower casing near the upper end.

[0015] The beneficial effect of the utility model is that when the blower is running, under the rotational gravitational force of the active rotor and the driven rotor, the external cooling air enters the inner cavity of the casing from the counter-flow cooling channel, and then is discharged from the air outlet. This process can take away part of the heat in the inner cavity of the casing. The cycle of this process can continuously reduce the temperature in the inner cavity of the casing, thereby ensuring that the inner cavity of the casing continuously maintains a suitable operating temperature range;

[0016] At the same time, the counter-flow cooling channels are respectively arranged at the left and right sides of the Roots blower casing near the upper end, and a reinforcing fixing plate and a connecting seat are arranged at the position of the Roots blower casing located at the counter-flow cooling channel. The reinforcing fixing plate divides the air intake channel into multiple channels, and the external low-temperature gas enters from the multiple channels respectively. Combined with the conical structural characteristics of the intermediate compression channel, it can further avoid irregular impact on the inner cavity of the casing due to excessive dispersion of the air flow direction, further reduce the noise when the blower is running, and can further reduce the turbulence generated when the active rotor and the driven rotor rotate, and reduce the resistance when the active rotor and the driven rotor rotate;

[0017] Furthermore, since the counterflow cooling channels are located on the left and right sides of the Roots blower casing near the upper end, when the impellers on the active rotor and the driven rotor rotate to the position of the inner air outlet channel, the air discharged from the inner air outlet channel will give the impeller a certain thrust, thereby further reducing the resistance of the active rotor and the driven rotor during rotation, thereby achieving the effect of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the casing of the utility model;

[0019] Figure 2 It is a cross-sectional view of the casing of the utility model;

[0020] Figure 3 It is a schematic diagram of the utility model after the casing and the rotor are assembled.

[0021] Explanation of symbols in the figure:

[0022] 1. Air inlet; 2. Air outlet; 3. Countercurrent cooling channel; 301. Outer air inlet channel; 302. Middle compression channel; 303. Inner air outlet channel; 4. Connecting seat; 401. Air inlet channel; 5. Fixing hole; 6. Inner cavity of casing; 7. Strengthening fixing plate; 8. Active rotor; 9. Driven rotor; 10. Active shaft; 11. Driven shaft. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with embodiments.

[0024] pass Figure 1-Figure 3 It can be seen that the Roots blower casing with a counterflow cooling structure includes an air inlet 1 and an air outlet 2, the air inlet 1 is located at the lower end of the Roots blower casing, and the air outlet 2 is located at the upper end of the Roots blower casing.

[0025] A casing cavity 6 is provided inside the casing of the Roots blower, and the air inlet 1 and the air outlet 2 are respectively connected to the casing cavity 6 .

[0026] A driving rotor 8 and a driven rotor 9 are provided in the inner cavity 6 of the casing. An axially penetrating driving shaft 10 is fixedly provided at the center position of the driving rotor 8. An axially penetrating driven shaft 11 is fixedly provided at the center position of the driven rotor 9. The driving rotor 8 and the driven rotor 9 are meshed with each other. The driving rotor 8 and the driven rotor 9 are respectively connected to the inner surface of the inner cavity 6 of the casing for rotation and sealing. When the blower is running, the driving rotor 8 and the driven rotor 9 rotate synchronously in opposite directions to inhale the gas from the air inlet 1 into the inner cavity 6 of the casing. Then, through the synchronous rotation of the driving rotor 8 and the driven rotor 9, the gas is transported to the position of the air outlet 2 and discharged outwardly, completing the entire gas transport process.

[0027] A counterflow cooling channel 3 is provided on the left and right sides of the casing of the Roots blower respectively. The counterflow cooling channel 3 and the inner cavity 6 of the casing are interconnected. The counterflow cooling channel 3 includes an outer air inlet channel 301, an intermediate compression channel 302 and an inner air outlet channel 303. The intermediate compression channel 302 is located in the middle position of the counterflow cooling channel 3, the outer air inlet channel 301 is located on the outer side of the counterflow cooling channel 3, and the inner air outlet channel 303 is located on the inner side of the counterflow cooling channel 3.

[0028] When the blower is running, the temperature in the inner cavity 6 of the casing continues to rise. At this time, under the rotational gravitational force of the active rotor 8 and the driven rotor 9, the external low-temperature air enters the inner cavity 6 of the casing from the countercurrent cooling channel 3, and then is discharged from the air outlet 2. This process can take away part of the heat in the inner cavity 6 of the casing. The cycle of this process can continuously reduce the temperature in the inner cavity 6 of the casing, thereby ensuring that the inner cavity 6 of the casing continues to maintain a suitable operating temperature range.

[0029] The middle compression channel 302 is a conical structure, and the middle compression channel 302 gradually narrows from the outside to the inside.

[0030] When external low-temperature air enters the intermediate compression channel 302 from the outer air intake channel 301, since the intermediate compression channel 302 gradually narrows from the outside to the inside, the incoming low-temperature air can be quickly compressed, the flow speed of the low-temperature air can be accelerated, and the circulation speed of the low-temperature air can be accelerated, thereby improving the cooling effect on the inner cavity 6 of the casing.

[0031] More importantly, since the intermediate compression channel 302 gradually narrows from the outside to the inside, the flow direction of the air can be effectively controlled to ensure that the air can be discharged smoothly from the air outlet 2 along the rotation trajectory of the rotor, thereby avoiding the excessive dispersion of the air flow direction. When the air enters the inner cavity 6 of the casing, it causes irregular impact on the inner cavity 6 of the casing, thereby increasing the noise during the operation of the blower. In addition, if the flow direction of the air is too dispersed, it will form different degrees of turbulence on the active rotor 8 and the driven rotor 9, increase the resistance of the active rotor 8 and the driven rotor 9 during rotation, and interfere with the normal rotation of the active rotor 8 and the driven rotor 9.

[0032] The connection between the outer air inlet channel 301 and the middle compression channel 302 adopts a circular arc smooth transition, and the connection between the middle compression channel 302 and the inner air outlet channel 303 adopts a circular arc smooth transition, which can further increase the smoothness of the flow of external low-temperature air in the countercurrent cooling channel 3 and reduce the flow resistance, which can not only ensure that the inner cavity 6 of the casing can be cooled quickly, but also further reduce the airflow interference with the active rotor 8 and the driven rotor 9.

[0033] The outer surface of the Roots blower casing is fixed with connecting seats 4 at the positions of the counterflow cooling channels 3 on the left and right sides. The connecting seats 4 extend outward along the outer surface of the Roots blower casing. The connecting seats 4 are provided with multiple fixing holes 5. The connecting seat 4 is a hollow structure. An air intake channel 401 is provided in the middle position of the connecting seat 4. The air intake channel 401 is connected to the counterflow cooling channel 3. By setting the connecting seat 4, when the external ambient temperature is too high, a cooling pipeline can be connected to the connecting seat 4, and a cooler can be used to cool the gas, and then the gas is transported to the casing inner cavity 6 through the cooling pipeline to cool the casing inner cavity 6 and the active rotor 8 and the driven rotor 9.

[0034] Reinforced fixing plates 7 are fixed to the outer surfaces of the left and right sides of the Roots blower housing respectively. The reinforced fixing plates 7 are vertically arranged on the outer surface of the Roots blower housing. The reinforced fixing plates 7 vertically penetrate the connecting seat 4 to divide the air intake channel 401 into multiple channels.

[0035] By providing the reinforcing fixing plate 7, the overall impact resistance of the Roots blower casing can be increased. At the same time, since the reinforcing fixing plate 7 divides the air inlet channel 401 into multiple channels, the external low-temperature gas enters from multiple channels respectively. Combined with the conical structural characteristics of the intermediate compression channel 302, it can further avoid irregular impact on the casing inner cavity 6 due to the excessive dispersion of the air flow direction, further reduce the noise during the operation of the blower, and can further reduce the turbulence when the active rotor 8 and the driven rotor 9 rotate, and reduce the resistance to the rotation of the active rotor 8 and the driven rotor 9.

[0036] The counter-flow cooling channels 3 are respectively located on the left and right sides of the Roots blower casing near the upper end.

[0037] The active rotor 8 and the driven rotor 9 used in the Roots blower are three-impeller rotors. When the impellers on the active rotor 8 and the driven rotor 9 rotate to the position of the inner air outlet channel 303, the air discharged from the inner air outlet channel 303 will give the impeller a certain thrust, thereby further reducing the resistance of the active rotor 8 and the driven rotor 9 during rotation, thereby achieving the effect of energy saving and consumption reduction.

[0038] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A Roots blower casing with a countercurrent cooling structure, characterized in that: It includes an air inlet and an air outlet, wherein the air inlet is located at the lower end of the housing of the Roots blower, and the air outlet is located at the upper end of the housing of the Roots blower; The interior of the Roots blower housing is provided with a housing inner cavity, and the air inlet and the air outlet are respectively connected to the housing inner cavity; A driving rotor and a driven rotor are arranged in the inner cavity of the casing, a driving shaft axially penetrating the driving rotor is fixedly arranged at the center of the driving rotor, and a driven shaft axially penetrating the driven rotor is fixedly arranged at the center of the driven rotor; The left and right sides of the Roots blower housing are respectively provided with counterflow cooling channels, the counterflow cooling channels and the housing inner cavity are interconnected, the counterflow cooling channels include an outer air inlet channel, an intermediate compression channel and an inner air outlet channel, the intermediate compression channel is located in the middle of the counterflow cooling channel, the outer air inlet channel is located at the outer side of the counterflow cooling channel, and the inner air outlet channel is located at the inner side of the counterflow cooling channel; The intermediate compression channel is a conical structure, and the intermediate compression channel gradually narrows from the outside to the inside; The connection between the outer air inlet channel and the middle compression channel adopts a circular arc smooth transition, and the connection between the middle compression channel and the inner air outlet channel adopts a circular arc smooth transition.

2. The Roots blower housing with a counter-flow cooling structure according to claim 1, characterized in that: The outer surface of the Roots blower housing is provided with connecting seats fixedly disposed at the positions of the counterflow cooling channels on the left and right sides, and the connecting seats extend outwardly along the outer surface of the Roots blower housing, and a plurality of fixing holes are disposed on the connecting seats. The connecting seats are hollow structures, and an air intake channel is disposed in the middle position of the connecting seats, and the air intake channel is connected to the counterflow cooling channel.

3. The Roots blower housing with a counter-flow cooling structure according to claim 2, characterized in that: The outer surfaces of the left and right sides of the Roots blower housing are respectively fixed with reinforcing fixing plates, which are vertically arranged on the outer surface of the Roots blower housing and vertically penetrate the connecting seat to divide the air intake channel into multiple channels.

4. The Roots blower housing with a counter-flow cooling structure according to claim 1, characterized in that: The counter-flow cooling channels are respectively located on the left and right sides of the Roots blower casing near the upper end.

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