Compressor

Abstract

The present invention relates to the technical field of compression equipment, in particular to a compressor for pressurized conveying of gas or liquid, which overcomes the problems of large volume, large air pressure fluctuation and high noise of existing Roots compressors. It has a main housing, a blade shaft, a first crescent shaft and a second crescent shaft. The blade shafts are equidistantly arranged between the first crescent shaft and the second crescent shaft. At both ends of the blade shaft, the air inlet and the air outlet respectively axially extend inwards with non-connecting air inlet channels and air outlet channels. The blades of the blade shaft have a front blade surface and a rear blade surface. The air inlet channel radially extends from the blade shaft behind the rear blade surface, and the air outlet channel radially extends from the blade shaft in front of the front blade surface; both the first crescent shaft and the second crescent shaft have crescent segments with a crescent-shaped cross-section and cylindrical segments at both ends of the crescent segments. The compressor sucks in gas through the air inlet channel after forming a negative pressure behind the rear blade surface of the blade due to the rotation of the blade shaft, and presses out the gas through the air outlet channel after forming a positive pressure in front of the front blade surface of the blade.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic motors, vacuum pumps, compression pumps, liquid pumps or engine equipment, and in particular to a compressor for pressurized gas or liquid transportation. This compressor also has another reverse use, that is, it becomes a motor driven by gas or liquid. Background Art

[0002] Compressors are generally divided into two categories. One is the positive displacement type, and the other is the dynamic type. Piston compressors, screw compressors and Roots compressors belong to the positive displacement type, and centrifugal compressors belong to the dynamic type. Due to their different structures, these compressors have different gas delivery volumes and gas delivery pressures under the same power, so they are respectively applied to different occasions. Of course, they can also be used for liquid transportation.

[0003] A Roots compressor is a constant flow compressor, and its flow rate change is very small, which is suitable for many working conditions, such as coal chemical industry, desulfurization, aquaculture aeration and sewage aeration, etc. The Roots compressor uses two two-lobe impellers or two three-lobe impellers to rotate relative to each other in the cylinder to compress and transport gas. Each time the three-lobe Roots compressor impeller rotates once, 2 impellers perform 3 times of suction and exhaust. There are 2 three-lobe impellers provided on 2 parallel shafts. There is always a small gap between the impeller and the inner hole surface of the elliptical machine box and between the impellers. Since the impellers rotate in opposite directions at a uniform speed, a certain amount of gas surrounded by the box body and the impellers is transported from the suction side to the discharge side.

[0004] The Roots compressor has certain disadvantages. For example, first, because the blades occupy most of the space in the cylinder, in order to ensure a certain gas delivery volume, the volume of the cylinder is designed to be relatively large; second, the compression method determines that the outlet air pressure is in a pulsed state and the air pressure is not uniform enough; third, like many other types of compressors, it has a problem of high noise. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a compressor to overcome the problems of large volume, large air pressure fluctuation and high noise of the existing Roots compressor.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a compressor, which has a main housing, a blade shaft, a first crescent shaft and a second crescent shaft. The blade shaft, the first crescent shaft and the second crescent shaft are arranged on the main housing in a state where the three shafts are parallel and the axes are located in the same plane. The blade shaft is equidistantly arranged between the first crescent shaft and the second crescent shaft, and the three shafts are rotationally supported by the end covers at both ends of the main housing.

[0007] Both ends of the blade shaft are respectively an air inlet and an air outlet. The air inlet and the air outlet respectively extend axially inwards with non - communicating air inlet channels and air outlet channels. The blade shaft has blades radially protruding therefrom. The blades have a top edge that can be attached to the inner peripheral wall of the main housing and two side edges that can be attached to the inner walls of the two end covers. The blades have a front blade surface facing the front of the rotation direction and a rear blade surface facing the rear of the rotation direction. The air inlet channel radially extends from the blade shaft at the rear side of the rear blade surface, and the air outlet channel radially extends from the blade shaft at the front side of the front blade surface;

[0008] Both the first crescent shaft and the second crescent shaft have a crescent - shaped section with a crescent - shaped cross - section and cylindrical sections at both ends of the crescent - shaped section. The top edge of the rotating blade can be attached to the concave arc surface of the crescent - shaped section, and the two side edges of the rotating blade can be attached to the inner end faces of the two cylindrical sections;

[0009] The transmission gear on the blade shaft meshes with the transmission gear on the first crescent shaft and the transmission gear on the second crescent shaft. The number of teeth of the transmission gears on the three shafts is the same to achieve synchronous rotation of the three shafts;

[0010] The compressor forms a negative pressure at the rear side of the rear blade surface of the blade due to the rotation of the blade shaft to suck in gas through the air inlet channel, and forms a positive pressure at the front side of the front blade surface of the blade to press out gas through the air outlet channel.

[0011] Specifically, in terms of the transmission structure, at least one end of the blade shaft, the first crescent shaft, and the second crescent shaft extends out from the main housing. The transmission gears on the blade shaft, the first crescent shaft, and the second crescent shaft are located outside the main housing and are sealed by a gearbox cover.

[0012] Specifically, in terms of the shape of a blade, the blade is a flat rectangle, and the top edge of the blade on the blade shaft is parallel to the axis of the blade shaft.

[0013] In order to improve the sealing performance and facilitate maintenance, detachable sealing strips are provided on the top edge and the two side edges of the blade.

[0014] Specifically, the axial lengths of the crescent - shaped sections on the first crescent shaft and the second crescent shaft, the axial length of the blade, and the distance between the two end covers on the main housing are the same.

[0015] Specifically, the inner end faces of the two end covers on the main housing have sunk platforms for accommodating the cylindrical sections on the first crescent shaft and the second crescent shaft.

[0016] In order to improve the rigidity and strength of the blade, the blade shaft has support ribs for increasing the rigidity of the blade.

[0017] Also in order to improve the sealing performance, sealing rings are provided between the two end covers of the main housing and the annular cylinder of the main housing.

[0018] Specifically, a pulley for transmitting power is provided on the blade shaft.

[0019] The beneficial effects of the present invention are as follows: First, the crescent shaft and the blade shaft of a single blade used in the present invention occupy less space in the cylinder. Under the condition of the same air delivery requirement, the volume of the cylinder is smaller. Second, the blade always presses out gas, so that the outlet air pressure and air volume do not show an obvious pulsating state, and both the outlet air pressure and air volume are relatively uniform. Third, under the condition of the same air delivery requirement, the rotational speed requirement of the blade shaft is lower. Fourth, due to the stable air pressure and air volume and the low rotational speed, the noise of the compressor is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the drawings and embodiments.

[0021] Figure 1 is a perspective view of the present invention;

[0022] Figure 2 is a schematic diagram of the present invention with the gearbox cover and end covers removed;

[0023] Figure 3 is a first schematic diagram of the present invention with the end cover of the air outlet removed;

[0024] Figure 4 is a second schematic diagram of the present invention with the end cover of the air outlet removed;

[0025] Figure 5 is a perspective view of the blade shaft in the present invention;

[0026] Figure 6 is the front view of the blade shaft in the present invention;

[0027] Figure 7 is Figure 6 the A-A cross-sectional view of;

[0028] Figure 8 is Figure 6 the B-B cross-sectional view of;

[0029] Figure 9 is a perspective view of the first crescent shaft in the present invention;

[0030] Figure 10 is the front view of the first crescent shaft in the present invention;

[0031] Figure 11 is Figure 10 the C-C cross-sectional view of;

[0032] Figures 12 to 15 is a schematic diagram of four rotational angle states when the blade shaft, the first crescent shaft and the second crescent shaft in the present invention are working.

[0033] In the figure: 1. Main housing, 1-1. End cover;

[0034] 2. Blade shaft, 2-1. Air inlet, 2-2. Air outlet, 2-3. Air inlet passage, 2-4. Air outlet passage, 2-5. Blade, 2-5-1. Top edge, 2-5-2. Side edge, 2-5-3. Front blade surface, 2-5-4. Rear blade surface, 2-6. Support rib, 2-7. Sealing strip;

[0035] 3. First crescent shaft;

[0036] 4. Second crescent shaft;

[0037] 5. Crescent-shaped gap;

[0038] 6. Gearbox cover;

[0039] 7. Pulley. Specific embodiments

[0040] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic way, so they only show the components related to the present invention.

[0041] As shown in the attached Figure 1 and 2 figures, a compressor has a main housing 1, a blade shaft 2, a first crescent shaft 3 and a second crescent shaft 4. Combining the attached Figure 3 and the attached Figure 4 figures, the blade shaft 2, the first crescent shaft 3 and the second crescent shaft 4 are arranged in a state where the three axes are parallel and the axes are located in the same plane on the main housing 1. The blade shaft 2 is equidistantly arranged between the first crescent shaft 3 and the second crescent shaft 4. The three axes are rotationally supported by the end caps 1-1 at both ends of the main housing 1. A sealing ring is provided between the end caps 1-1 at both ends of the main housing 1 and the annular cylinder of the main housing 1. One end of each of the two ends of the blade shaft 2, one end of the first crescent shaft 3 and one end of the second crescent shaft 4 extend out from the main housing. The transmission gears on the blade shaft 2, the first crescent shaft 3 and the second crescent shaft 4 are located outside the main housing 1 and are sealed by the gearbox cover 6;

[0042] As shown in the attached Figure 5 to the attached Figure 8, both ends of the blade shaft 2 are respectively an air inlet 2-1 and an air outlet 2-2. The air inlet 2-1 and the air outlet respectively extend axially inwards with non-connecting air inlet channels 2-3 and air outlet channels 2-4, that is, the air inlet channel 2-3 and the air outlet channel 2-4 are not connected axially. The blade shaft 2 has radially protruding blades 2-5. The blade 2-5 has a top edge 2-5-1 that can fit on the inner peripheral wall of the main housing and two side edges 2-5-2 that can fit on the inner walls of the two end covers 1-1. The blade 2-5 is a flat rectangle. The top edge 2-5-1 of the blade 2-5 is parallel to the axis of the blade shaft 2. The blade 2-5 has a front blade surface 2-5-3 facing the front of the rotation direction and a rear blade surface 2-5-4 facing the rear of the rotation direction. The air inlet channel 2-3 radially extends from the blade shaft 2 at the rear side of the rear blade surface 2-5-4, and the air outlet channel 2-4 radially extends from the blade shaft 2 at the front side of the front blade surface 2-5-3. Radially extending means that the air inlet channel 2-3 and the air outlet channel 2-4 communicate with the external space of the blade shaft 2 in the radial direction. There are two radially extending holes on the blade shaft 2; there are support ribs 2-6 on the blade shaft 2 to increase the rigidity of the blade 2-5;

[0043] As shown in the attached Figures 9 to 11 figure, the first crescent shaft 3 and the second crescent shaft 4 have the same structure. Therefore, only the first crescent shaft 3 is taken as an example in the attached figure. Both the first crescent shaft 3 and the second crescent shaft 4 have a crescent section with a crescent-shaped cross-section and cylindrical sections at both ends of the crescent section. Combining the attached Figure 3 figure and the attached Figure 5 figure, the top edge 2-5-1 of the rotating blade 2-5 can fit on the concave arc surface of the crescent section, and the two side edges 2-5-2 of the rotating blade 2-5 can fit on the inner end faces of the two cylindrical sections. The area enclosed by the concave arc surface of the crescent section and the inner end faces of the two cylindrical sections is a lunate space 5. The lunate space 5 is the meshing area for the blade 2-5 to enter. There are sinks on the inner end faces of the two end covers 1-1 on the main housing 1 to accommodate the cylindrical sections on the first crescent shaft 3 and the second crescent shaft 4; the axial lengths of the crescent sections on the first crescent shaft 3 and the second crescent shaft 4, the axial length of the blade 2-5, and the distance between the two end covers 1-1 on the main housing 1 are the same, so that the blade 2-5 moves between the two end covers 1-1 and within the two lunate spaces 5; detachable sealing strips 2-7 are provided on the top edge 2-5-1 and the two side edges 2-5-2 of the blade 2-5;

[0044] The fitting of the top edge 2-5-1 of the above-mentioned blade 2-5 with the inner peripheral wall of the main housing and the concave arc surface of the crescent section, as well as the fitting of the two side edges 2-5-2 with the inner walls of the two end covers 1-1 and the inner end faces of the two cylindrical sections, are all for sealing to form a positive pressure area and a negative pressure area. Therefore, theoretically, this fitting is that the blade 2-5 remains in a sealed state with the contact surface during movement. However, due to reasons such as structure, process, material, and service life, it is not difficult to understand that this fitting includes contact or having only a tiny gap even without contact. This gap may be from 0.01 mm to 0.15 mm. For example, the detachable sealing strips 2-7 are provided on the top edge 2-5-1 and the two side edges 2-5-2 of the blade 2-5. In the early stage of a working cycle of the compressor, there is no gap on the working edge of the blade 2-5. In the middle stage, there is a slight gap. By the late stage, if the gap is too large, the sealing strip 2-7 needs to be replaced.

[0045] The transmission gear on the blade shaft 2 meshes with the transmission gear on the first crescent shaft 3 and the transmission gear on the second crescent shaft 4. The number of teeth of the transmission gears on the three shafts is the same to achieve synchronous rotation of the three shafts. The rotation directions of the first crescent shaft 3 and the second crescent shaft 4 are the same, and the rotation direction of the blade shaft 2 is different from that of the first crescent shaft 3. When the three shafts rotate, the orientations of the concave arc surfaces of the crescent sections on the first crescent shaft 3 and the second crescent shaft 4 are always the same; a pulley 7 for introducing power is provided on the blade shaft 2. Of course, a sprocket under a chain drive power device can also be used.

[0046] The inner peripheral wall of the main housing 1 simultaneously wraps the rotary outer peripheral surface of the blade 2-5, the rotary outer peripheral surface of the crescent section of the first crescent shaft 3, and the rotary outer peripheral surface of the crescent section of the second crescent shaft 4.

[0047] When the compressor rotates the blade shaft 2, a negative pressure is formed behind the rear blade surface 2-5-4 of the blade 2-5, and then gas is inhaled through the air inlet passage 2-3. A positive pressure is formed in front of the front blade surface 2-5-3 of the blade 2-5, and then the gas is pressed out through the air outlet passage 2-4.

[0048] Next, combined with the attached Figure 12 to the attached Figure 15 The working principle of the present invention will be described:

[0049] Power is transmitted by the pulley 7. The vane shaft 2 drives the first crescent shaft 3 and the second crescent shaft 4 to rotate simultaneously. The space behind the rear vane surface 2-5-4 of the vane 2-5 becomes larger to form a negative pressure, and air is inhaled through the air inlet passage 2-3. The space in front of the front vane surface 2-5-3 of the vane 2-5 becomes smaller to form a positive pressure, and air is pressed out through the air outlet passage 2-4. The crescent segments on the first crescent shaft 3 and the second crescent shaft 4 play a role in alternately closing the negative pressure space (low-pressure area) and the positive pressure space (high-pressure area). The front side of the front vane surface 2-5-3 of the vane 2-5 is always the high-pressure area, and the rear side of the rear vane surface 2-5-4 of the vane 2-5 is always the low-pressure area. The air pressure and air volume of the gas pressed out by the compressor do not have obvious pulse fluctuations.

[0050] In addition, the present invention is not only used for the compression and transportation of gases, but also can be used for the compression and transportation of liquids. Since the vane shaft 2 for transporting gases or liquids rotates, a sealing structure needs to be provided between both ends of the vane shaft 2 and the connected pipelines.

[0051] Enlightened by the above ideal embodiments according to the present invention, through the above description, relevant staff can completely make various changes and modifications within the scope not deviating from the technical idea of this invention. For example, gear transmission can be used instead of belt transmission. Therefore, the technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the content of the claims or the solutions that can be simply transformed.

Claims

1. A compressor, characterized in that: It has a main housing, a blade shaft, a first crescent shaft and a second crescent shaft. The blade shaft, the first crescent shaft and the second crescent shaft are arranged on the main housing in a state where the three shafts are parallel and their axes are located in the same plane. The blade shaft is equidistantly arranged between the first crescent shaft and the second crescent shaft, and the three shafts are rotatably supported by the end caps at both ends of the main housing; Both ends of the blade shaft are an air inlet and an air outlet respectively. The air inlet and the air outlet axially extend inwards with non-connecting air inlets and air outlets respectively. The blade shaft has radially protruding blades. The blades have a top edge that can fit on the inner peripheral wall of the main housing and two side edges that can fit on the inner wall of the end caps at both ends. The blades have a front blade surface facing the front of the rotation direction and a rear blade surface facing the rear of the rotation direction. The air inlet extends radially from the blade shaft on the rear side of the rear blade surface, and the air outlet extends radially from the blade shaft on the front side of the front blade surface; Both the first crescent shaft and the second crescent shaft have crescent sections with a crescent-shaped cross-section and cylindrical sections at both ends of the crescent sections. The top edge of the blade can fit on the concave arc surface of the crescent section, and the two side edges of the blade can fit on the inner end faces of the two cylindrical sections; The transmission gears on the blade shaft mesh with the transmission gears on the first crescent shaft and mesh with the transmission gears on the second crescent shaft. The number of teeth of the transmission gears on the three shafts is the same to achieve synchronous rotation of the three shafts; The compressor forms a negative pressure on the rear side of the rear blade surface of the blade by the rotation of the blade shaft to suck in gas through the air inlet, and forms a positive pressure on the front side of the front blade surface of the blade to press out gas through the air outlet; At least one end of the blade shaft, the first crescent shaft and the second crescent shaft extends out of the main housing. The transmission gears on the blade shaft, the first crescent shaft and the second crescent shaft are located outside the main housing and are sealed by a gearbox cover; A sealing ring is provided between the end caps at both ends of the main housing and the annular cylinder of the main housing.

2. The compressor according to claim 1, characterized in that: The top edge of the blade on the blade shaft is parallel to the axis of the blade shaft.

3. The compressor according to claim 1, characterized in that: Removable sealing strips are provided on the top edge and the two side edges of the blade.

4. The compressor according to claim 1, wherein: The axial lengths of the crescent sections on the first crescent shaft and the second crescent shaft, the axial length of the blade and the distance between the end caps on the main housing are the same.

5. The compressor according to claim 1, characterized in that: The inner end faces of the end caps at both ends of the main housing have sunk platforms for accommodating the cylindrical sections on the first crescent shaft and the second crescent shaft.

6. The compressor according to claim 1, characterized in that: The blade shaft has support ribs for increasing the rigidity of the blade.

7. The compressor according to claim 1, characterized in that: A pulley for transmitting power is provided on the blade shaft.

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