Integrated unit structure of volumetric blower

Abstract

The utility model discloses an integrated unit structure of a volumetric blower, which comprises an integrated shell, a blower main machine, an exhaust silencer and a driving motor are accommodated in the integrated shell, an air inlet end of the exhaust silencer is directly butted on a cylinder body exhaust port of the blower main machine, and an air outlet end of the exhaust silencer is directly butted on a cylinder body exhaust port of the driving motor. Gas exhausted from the exhaust port of the cylinder body of the draught fan main machine directly enters the exhaust silencer to be subjected to silencing treatment, the driving motor and a driving rotor in the draught fan main machine are coaxially and directly driven, the draught fan main machine, the exhaust silencer and the driving motor share space and materials to the maximum extent, the manufacturing cost is greatly reduced, and the service life of the draught fan main machine is prolonged. And compared with a traditional structural mode, the volume is compressed by one half, and the weight is reduced by one third.

Description

Technical Field

[0001] The utility model relates to a volumetric gas conveying device, in particular to an integrated unit structure of a volumetric blower. Background Art

[0002] Existing volumetric gas delivery hosts, including twin-screw gas delivery hosts and roots-type gas delivery hosts, do not contain exhaust mufflers themselves. When in use, they need to be connected to an independent exhaust muffler outside their exhaust port through a connecting pipe to form a complete blower. The common features of these volumetric gas delivery devices are: a sealed cavity formed by a pair of grooves on the outer circle of the rotor in the cylinder and the inner circle of the cylinder. These sealed cavities inhale air from the air inlet 10, and then as the rotor rotates, the gas in these sealed cavities is pushed by the rotor and discharged through the cylinder exhaust port 5 of the main engine cylinder 1. In order to reduce the exhaust noise, an additional exhaust muffler needs to be installed. When the exhaust muffler is installed, the main engine exhaust port 6 and the exhaust muffler inlet 11 are connected through a section of connecting pipe 7 so that the gas discharged from the main engine cylinder can enter the exhaust muffler 8.

[0003] In addition, the fan host and the drive motor of the volumetric gas conveying equipment both adopt independent structural systems, and the independent drive motor is connected to the driving shaft of the fan host through a coupling 13 for power transmission.

[0004] Such a structure has the following problems:

[0005] 1. The noise and vibration of the gas discharged from the main engine cylinder before reaching the exhaust muffler will radiate into the space and affect the environment;

[0006] 2. The passage before the main engine cylinder reaches the exhaust muffler has a certain energy loss on the mechanical energy of the gas;

[0007] 3. The passage between the main engine cylinder and the exhaust muffler takes up space and consumes a certain amount of material;

[0008] 4. This separate structure requires a large space for the exhaust muffler and drive motor;

[0009] 5. The frame 16 supporting the drive motor and the main machine also occupies a large space and consumes a lot of materials;

[0010] 6. With this structure, when a soundproof cover is configured externally, the volume of the soundproof cover is bound to be larger.

[0011] 7. The driving motor is connected to the driving shaft of the fan host through a coupling for power transmission, which results in a certain power loss.

[0012] 8. The driving motor is connected to the driving shaft of the fan main engine through a coupling for power transmission. The assembly process is complicated, the adjustment is difficult, the failure rate is high, and there are safety hazards.

[0013] 9. The driving motor is connected to the driving shaft of the fan host through a coupling for power transmission, and the coupling part occupies a large space. Utility Model Content

[0014] In order to overcome the above defects, the utility model provides an integrated unit structure of a volumetric blower, which has low manufacturing cost, occupies a small space, has a compact overall structure, has low operating noise and low energy loss.

[0015] The utility model adopts a technical solution to solve the technical problem: an integrated unit structure of a volumetric blower, including an integrated shell, wherein a blower host, an exhaust muffler and a drive motor are accommodated in the integrated shell, the air inlet end of the exhaust muffler is directly connected to the cylinder exhaust port of the blower host, the gas discharged from the cylinder exhaust port of the blower host directly enters the exhaust muffler for silencing treatment, and the drive motor is directly driven coaxially with the active rotor inside the blower host.

[0016] As a further improvement of the utility model, a motor cavity and a main engine cylinder are provided at intervals inside the integrated shell, wherein: a motor stator is fixedly installed in the motor cavity, a driving shaft and at least one driven shaft are rotatably provided in the main engine cylinder, the driving shaft and the driven shaft are arranged in parallel and at intervals, the driving shaft axially extends into the motor cavity, a driving rotor is provided in a fixed sleeve on the circumferential outer side of the portion of the driving shaft located in the main engine cylinder, a motor rotor is provided in a fixed sleeve on the circumferential outer side of the portion of the driving shaft located in the motor cavity, a driven rotor is provided in a fixed sleeve on the circumferential outer side of the driven shaft, a driven rotor is provided in a fixed sleeve on the circumferential outer side of the driven shaft, the motor stator fixedly provided in the motor cavity can drive the motor rotor to rotate by electromagnetic force, the motor rotor drives the driving shaft to rotate, a set of synchronous gears are respectively provided at the same axial position of the driving shaft and the driven shaft, the driving shaft can drive the driven shaft to rotate by the synchronous gears, and the rotation of the driving shaft and the driven shaft respectively drives the driving rotor and the driven rotor to rotate, the motor cavity and the driving shaft, the motor rotor and the motor stator therein together form a drive motor, and the main engine cylinder and the driving shaft, the driven shaft, the driving rotor and the driven rotor therein together form a fan main engine;

[0017] A connecting passage is provided between the motor cavity and the main engine cylinder body to connect the two. A first driving shaft bearing is fixedly arranged in the connecting passage. A second driving shaft bearing is arranged at the end of the driving shaft located at one end of the driving rotor.

[0018] As a further improvement of the utility model, the driving rotor and the driven rotor in the main engine cylinder body adopt a screw structure.

[0019] As a further improvement of the utility model, the active rotor and the driven rotor in the main engine cylinder body adopt a Roots-type structure.

[0020] As a further improvement of the present invention, an exhaust silencer cavity is provided at the lower portion of the integrated shell, and the exhaust silencer cavity is arranged in parallel on the radial side of the motor cavity and the main engine cylinder body, and an exhaust port of the whole machine connected to the inside of the exhaust silencer cavity is formed at one end of the exhaust silencer cavity, and the other end of the exhaust silencer cavity is connected to the cylinder exhaust port on the side wall of the main engine cylinder body, and a muffler inner core is fixedly installed in the exhaust silencer cavity, and a gas channel connected to the exhaust port of the whole machine and the cylinder exhaust port is formed at the center position of the muffler inner core, and the muffler inner core can perform silencer treatment on the gas passing through the gas channel so that the exhaust noise of the exhaust port of the whole machine is smaller than the exhaust noise of the cylinder exhaust port, and the exhaust silencer cavity and the muffler inner core therein together form an exhaust silencer.

[0021] As a further improvement of the present invention, the other end of the exhaust silencer cavity opposite to the exhaust port of the whole machine is an open structure, and an exhaust silencer end plate is removably fixedly installed at the corresponding position on the integrated shell, and the exhaust silencer end plate seals and covers the opening structure of the exhaust silencer cavity.

[0022] As a further improvement of the utility model, a first sealing body and a second sealing body are respectively arranged on both sides of the first bearing of the driving shaft, the first sealing body is located between the motor cavity and the first bearing of the driving shaft, and the second sealing body is located between the first bearing of the driving shaft and the main engine cylinder body, the outer circles of the circumferences of the first sealing body and the second sealing body are sealed and connected to the inner side wall of the connecting channel, and the inner circles of the circumferences of the first sealing body and the second sealing body are in dynamic sealing contact with the outer circle of the circumference of the driving shaft.

[0023] As a further improvement of the present invention, a third sealing body is provided between the second bearing of the driving shaft and the driving rotor.

[0024] As a further improvement of the utility model, a first driven shaft bearing and a second driven shaft bearing are respectively provided at both ends of the driven shaft, and the first driven shaft bearing and the second driven shaft bearing are respectively arranged opposite to the first driving shaft bearing and the second driving shaft bearing on the driving shaft, and a fourth sealing body is provided between the first driven shaft bearing and the driven rotor, and a fifth sealing body is provided between the second driven shaft bearing and the driven rotor.

[0025] As a further improvement of the present invention, an opening structure is formed at the axially outer end of the motor cavity in the integrated shell, and a motor fan cover is detachably fixedly installed on the opening structure, a cooling fan accommodating space connected to the motor cavity is formed inside the motor fan cover, the end of the driving shaft extends into the cooling fan accommodating space, and a motor cooling fan blade is fixedly installed on the outer circumference of the end of the driving shaft, the motor cooling fan blade can be accommodated in the cooling fan accommodating space so as to rotate with the driving shaft, an axially through ventilation groove is provided between the motor stator and the motor cavity or on the outer side wall of the motor cavity, one end of the ventilation groove close to the cooling fan accommodating space is connected to the inner side of the cooling fan accommodating space, the axial outer side of the cooling fan accommodating space is connected to the external space, and the other end of the ventilation groove is also connected to the external space, and when the motor cooling fan blades rotate, they push the air to flow axially along the ventilation groove to take away the heat generated during the operation of the motor.

[0026] As a further improvement of the present utility model, an opening structure is formed at the outer end of the main engine cylinder body within the integrated housing, and a fuel tank housing is detachably fixedly mounted on the opening structure. The fuel tank housing seals the inner cavity of the cylinder body on the side facing the inner cavity of the main engine cylinder body to form an end plate of the main engine cylinder body. The interior of the fuel tank housing can accommodate a third sealing body, a second bearing of the driving shaft and a synchronous gear. The fuel tank housing is a box-type structure, and the axial outer side of the fuel tank housing facing away from the main engine cylinder body is fixedly covered with a fuel tank end plate.

[0027] As a further improvement of the utility model, the first driving shaft bearing and the second driving shaft bearing on the driving shaft and the first driven shaft bearing and the second driven shaft bearing on the driven shaft, at least one bearing on each shaft is a deep groove ball bearing, the first driving shaft bearing and the second driving shaft bearing are respectively arranged on both sides of the driving rotor, and the first driven shaft bearing and the second driven shaft bearing are respectively arranged on both sides of the driven rotor.

[0028] As a further improvement of the present utility model, a motor end plate is fixedly provided in the motor cavity, the motor end plate is located between the motor cooling fan blades and the motor rotor, a third bearing of the driving shaft is fixedly installed on the motor end plate, sealing bodies are provided on both axial sides of the third bearing of the driving shaft, one end of the driving shaft extending into the motor cavity is inserted into the third bearing of the driving shaft, the first bearing of the driving shaft, the second bearing of the driving shaft and the third bearing of the driving shaft on the driving shaft exist at the same time, so that the driving shaft forms a three-set bearing support system, or the first bearing of the driving shaft is cancelled, and only the second bearing of the driving shaft and the third bearing of the driving shaft exist at the same time on the driving shaft, so that the driving shaft forms a two-set bearing support system supported at both ends.

[0029] As a further improvement of the utility model, a whole machine foot is fixedly arranged on the one-piece shell, and a mounting hole for installation is provided on the whole machine foot.

[0030] The beneficial effects of the utility model are as follows: the driving motor and the active rotor located in the cylinder body of the fan host of the utility model adopt the same driving shaft, and the driving motor, the fan host and the exhaust muffler are made into an integrated shell structure, and the cylinder exhaust port of the main engine cylinder is directly used as the air inlet of the exhaust muffler. The utility model integrates the fan host, the exhaust muffler and the driving motor into one, and the three are interdependent. A deep fusion design is achieved between the fan host, the exhaust muffler and the driving motor, and the three share space and materials to the maximum extent, and the traditional frame part is omitted, so that the volume of the volumetric gas conveying equipment is greatly reduced, precious space and considerable metal materials are saved, and the manufacturing cost is greatly reduced. The exhaust muffler makes maximum use of the main engine cylinder and the lower part of the driving motor. Space: The space inside the exhaust muffler is large, which is conducive to improving the muffler effect. The one-piece shell can be cast, and the mechanical strength and stability are enhanced. The positions of the inner cavity of the main engine cylinder, the motor cavity and the exhaust muffler cavity are fixed, the dimensional error is small, the performance of the whole machine is stable, and the main engine cylinder and the exhaust muffler are seamlessly integrated, which effectively compresses the link of noise leakage. The main engine cylinder and the exhaust muffler are integrated into one, which shortens the gas channel to the maximum extent, and the energy loss of gas flow is small. The utility model makes the overall structure of the volumetric gas conveying equipment simple, the assembly process is greatly simplified, and the assembly accuracy is fully guaranteed; the overall volume is small, and when a soundproof cover is configured on the outside, the volume of the soundproof cover is also reduced. Compared with the traditional structural mode, the volume is compressed by one half and the weight is reduced by one third. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an existing twin-screw gas conveying equipment;

[0032] Figure 2 It is a structural schematic diagram of an existing Roots-type gas conveying equipment;

[0033] Figure 3 It is a three-dimensional diagram of the utility model;

[0034] Figure 4 This is a cross-sectional view of the structure principle of the twin-screw gas conveying equipment of the utility model;

[0035] Figure 5 for Figure 4 Middle AA section view;

[0036] Figure 6 for Figure 4 Middle BB section view;

[0037] Figure 7 This is a cross-sectional view of the structural principle of the Roots-type gas conveying equipment used in the utility model;

[0038] Figure 8 for Figure 7 Middle CC section view;

[0039] Fig. 9 for Figure 7 Middle DD section view.

[0040] Main engine cylinder--1 Driven rotor--2 Active rotor--3

[0041] Oil tank housing--4 Cylinder exhaust port--5 Main engine exhaust port--6

[0042] Connecting pipe--7 Exhaust muffler--8 Machine exhaust port--9

[0043] Air inlet--10 Muffler inlet--11 Drive motor--12

[0044] Coupling--13 Muffler core--14 Gas channel--15

[0045] Frame--16 Muffler end plate--17 Motor cavity---18

[0046] Motor stator---19 Motor rotor---20 Motor cooling fan blades---21

[0047] First seal body---22 First bearing of driving shaft---23

[0048] Synchronous gear---24 Second sealing body--25 Third sealing body---26

[0049] Second bearing of driving shaft---27 Driving shaft---28 Machine base---29

[0050] Motor fan cover 30 Driven shaft --- 31 Integrated housing --- 32

[0051] Fuel tank end plate---33 DETAILED DESCRIPTION

[0052] Embodiment: An integrated unit structure of a volumetric blower includes an integrated shell 32, wherein the integrated shell 32 accommodates a blower main unit, an exhaust muffler 8 and a drive motor 12, wherein the air inlet end of the exhaust muffler 8 is directly connected to the cylinder exhaust port 5 of the blower main unit, and the gas discharged from the cylinder exhaust port 5 of the blower main unit directly enters the exhaust muffler 8 for silencing treatment, and the drive motor 12 is coaxially and directly driven with the active rotor 3 inside the blower main unit.

[0053] The cylinder exhaust port 5 of the fan main unit is directly connected to the inlet of the exhaust muffler 8. This mode directly silences the noise at the source of the noise, with good noise reduction effect. The fan main unit and the exhaust muffler 8 are integrated, which shortens the gas exhaust channel to the maximum extent and reduces the energy loss of gas flow.

[0054] When in use, a complete gas delivery unit can be formed by connecting an air intake filter or an air intake pipe to the main engine air intake port 10. A soundproof cover can also be configured outside the integrated housing 32. In this case, the soundproof cover has a smaller volume and a smaller noise radiation surface, thereby achieving a better sound insulation effect.

[0055] The motor cavity 18 and the main engine cylinder body 1 are arranged in intervals inside the integrated housing 32, wherein: a motor stator 19 is fixedly installed in the motor cavity 18, a driving shaft 28 and at least one driven shaft 31 are rotatably arranged in the main engine cylinder body 1, the driving shaft 28 and the driven shaft 31 are arranged in parallel and spaced apart, the driving shaft 28 extends axially into the motor cavity 18, a driving rotor 3 is fixedly sleeved on the circumferential outer side of the portion of the driving shaft 28 located in the main engine cylinder body 1, a motor rotor 20 is fixedly sleeved on the circumferential outer side of the portion of the driving shaft 28 located in the motor cavity 18, a driven rotor 2 is fixedly sleeved on the circumferential outer side of the driven shaft 31, and a driven rotor 2 is fixedly sleeved on the circumferential outer side of the driven shaft 31, and a fixed stator 19 is fixedly sleeved on the motor cavity 18. The motor stator 19 can drive the motor rotor 20 to rotate by electromagnetic force, and the motor rotor 20 drives the driving shaft 28 to rotate. The driving shaft 28 and the driven shaft 31 are respectively provided with a set of synchronous gears 24 at the same position in the axial direction. The driving shaft 28 can drive the driven shaft 31 to rotate through the synchronous gears 24. The rotation of the driving shaft 28 and the driven shaft 31 respectively drives the driving rotor 3 and the driven rotor 2 to rotate. The motor cavity 18 and the driving shaft 28, the motor rotor 20 and the motor stator 19 therein together form a driving motor 12, and the main engine cylinder 1 and the driving shaft 28, the driven shaft 31, the driving rotor 3 and the driven rotor 2 therein together form a fan main engine;

[0056] A connecting passage is provided between the motor cavity 18 and the main engine cylinder body 1 to connect the two. A first driving shaft bearing 23 is fixedly provided in the connecting passage. A second driving shaft bearing 27 is provided at the end of the driving shaft 28 located at one end of the driving rotor 3 .

[0057] The main engine cylinder body 1, the motor cavity 18 and the outer shell of the exhaust muffler 8 are integrated with each other to form an integrated shell 32. After the three are highly integrated into an integrated structure, the shell structure is shared, which not only compresses the volume but also saves materials.

[0058] The motor cavity 18 and the motor stator 19, the motor rotor 20 and one end of the driving shaft 28 inside it form the driving motor 12, the main engine cylinder 1 and the driving shaft 28, the driving rotor 3, the driven shaft 31 and the driven rotor 2 inside it form the fan main engine, the driving shaft 28 of the fan main engine is also the main shaft of the driving motor 12, the driving rotor 3 and the motor rotor 20 of the fan main engine adopt the transmission structure of the same driving shaft 28, eliminating the transmission links such as couplings, and also eliminating the tedious debugging work such as centering; the transmission efficiency is 100%, and the reliability is high.

[0059] The driving rotor 3 and the driven rotor 2 in the main engine cylinder body 1 adopt a screw structure.

[0060] The driving rotor 3 and the driven rotor 2 in the main engine cylinder body 1 adopt a Roots-type structure.

[0061] An exhaust silencer cavity is provided at the lower portion of the integrated shell 32, and the exhaust silencer cavity is arranged in parallel to the radial side of the motor cavity 18 and the main engine cylinder body 1, and an exhaust port 9 of the whole machine connected to the inside of the exhaust silencer cavity is formed at one end of the exhaust silencer cavity, and the other end of the exhaust silencer cavity is connected to the cylinder exhaust port 5 on the side wall of the main engine cylinder body 1. A muffler core 14 is fixedly installed in the exhaust silencer cavity, and a gas channel 15 connected to the exhaust port 9 of the whole machine and the cylinder exhaust port 5 is formed at the center position of the muffler core 14. The muffler core 14 can perform silencer treatment on the gas passing through the gas channel 15 so that the exhaust noise of the exhaust port 9 of the whole machine is smaller than the exhaust noise of the cylinder exhaust port 5. The exhaust silencer cavity and the muffler core 14 therein together form an exhaust silencer 8.

[0062] The main engine cylinder body 1, the exhaust silencer cavity of the exhaust silencer 8 and the motor cavity 18 of the drive motor 12 are an integrated structure. The main engine cylinder body 1 and the motor cavity 18 are above the exhaust silencer cavity. The exhaust silencer 8 makes full use of the space below the fan main engine and the drive motor 12. Figure 4 -- Fig. 9 There is a large space inside the exhaust muffler 8, which can effectively improve the muffler effect.

[0063] The other end of the exhaust silencer cavity facing the exhaust port 9 of the whole machine is an open structure, and an exhaust silencer end plate 17 is detachably fixedly installed at the corresponding position on the integrated shell 32, and the exhaust silencer end plate 17 seals and covers the opening structure of the exhaust silencer cavity.

[0064] On the basis of sharing the casing, a detachable exhaust muffler end plate 17 is provided at the end of the exhaust muffler 8 close to the main engine cylinder body 1, which brings convenience to maintenance and repair work.

[0065] A first sealing body 22 and a second sealing body 25 are respectively arranged on both sides of the first bearing 23 of the driving shaft. The first sealing body 22 is located between the motor cavity 18 and the first bearing 23 of the driving shaft, and the second sealing body 25 is located between the first bearing 23 of the driving shaft and the main engine cylinder body 1. The outer circles of the circumferences of the first sealing body 22 and the second sealing body 25 are sealed and connected to the inner side wall of the connecting channel, and the inner circles of the circumferences of the first sealing body 22 and the second sealing body 25 are in dynamic sealing contact with the outer circle of the circumference of the driving shaft 28.

[0066] By installing the first driving shaft bearing 23, the first sealing body 22 and the second sealing body 25 in the connecting channel, effective separation between the motor cavity 18 and the inner cavity of the main engine cylinder body 1 is achieved, while also making the overall structure more compact and making full use of the internal space of the integrated housing 32.

[0067] The first sealing body 22 prevents the lubricating oil for lubricating the first bearing 23 of the driving shaft from leaking into the motor cavity 18 , and the second sealing body 25 prevents the lubricating oil for lubricating the first bearing 23 of the driving shaft from leaking into the inner cavity of the main engine cylinder 1 .

[0068] A third sealing body 26 is provided between the second driving shaft bearing 27 and the driving rotor 3. The third sealing body 26 is used to prevent the lubricating oil used to lubricate the bearing from leaking into the inner cavity of the main engine cylinder 1.

[0069] A first bearing of the driven shaft 31 and a second bearing of the driven shaft 31 are respectively provided at both ends of the driven shaft 31. The first bearing of the driven shaft 31 and the second bearing of the driven shaft 31 are respectively arranged opposite to the first bearing 23 of the driving shaft and the second bearing 27 of the driving shaft 28, and a fourth sealing body is provided between the first bearing of the driven shaft 31 and the driven rotor 2, and a fifth sealing body is provided between the second bearing of the driven shaft 31 and the driven rotor 2.

[0070] The axial outer end of the motor cavity 18 in the integrated shell 32 forms an opening structure, and a motor fan cover 30 is detachably fixedly installed on this opening structure, and a cooling fan accommodating space connected to the motor cavity 18 is formed inside the motor fan cover 30, and the end of the driving shaft 28 extends into the cooling fan accommodating space, and a motor cooling fan blade 21 is fixedly installed on the outer circle of the end of the driving shaft 28, and the motor cooling fan blade 21 can be accommodated in the cooling fan accommodating space rotatably with the driving shaft 28, and an axially through ventilation groove is provided between the motor stator 19 and the motor cavity 18 or on the outer side wall of the motor cavity 18, and one end of the ventilation groove close to the cooling fan accommodating space is connected to the inner side of the cooling fan accommodating space, and the axial outer side of the cooling fan accommodating space is connected to the external space, and the other end of the ventilation groove is also connected to the external space, and when the motor cooling fan blade rotates, it pushes the air to flow along the axial direction of the ventilation groove to take away the heat generated during the operation of the motor. A detachable motor fan cover 30 is provided at the rear of the driving motor 12 , which brings convenience to the installation and maintenance of the driving motor 12 .

[0071] The outer end of the main engine cylinder block 1 in the integrated housing 32 forms an opening structure, on which a fuel tank housing 4 is detachably fixedly mounted, and the fuel tank housing 4 closes the inner cavity of the cylinder block 1 on the side facing the inner cavity of the main engine cylinder block 1 to form an end plate of the main engine cylinder block 1, and the interior of the fuel tank housing 4 can accommodate a third sealing body 26, a second driving shaft bearing 27 and a synchronous gear 24. The fuel tank housing 4 is a box-type structure, and the axial outer side surface of the fuel tank housing 4 facing away from the main engine cylinder block 1 is fixedly covered with a fuel tank end plate 33.

[0072] A detachable oil tank housing 4 is provided at the outer end of the main engine cylinder body 1. The oil tank housing 4 can serve as an end plate of the inner cavity of the cylinder body and can also be used to accommodate the related third sealing body 26, the second bearing 27 of the driving shaft and the synchronous gear 24. It is convenient to install and maintain, has a simple structure and saves materials.

[0073] The driving shaft first bearing 23 and the driving shaft second bearing 27 on the driving shaft 28 and the driven shaft 31 first bearing and the driven shaft 31 second bearing on the driven shaft 31, each shaft has at least one bearing that is a deep groove ball bearing, the driving shaft first bearing 23 and the driving shaft second bearing 27 are respectively arranged on both sides of the driving rotor 3, and the driven shaft 31 first bearing and the driven shaft 31 second bearing are respectively arranged on both sides of the driven rotor 2. The driving shaft 28 is provided with the driving shaft first bearing 23 and the driving shaft second bearing 27 at both ends of the driving rotor 3, two sets of bearings, i.e., two fulcrums, and the driving shaft 28 at the position where the motor rotor 20 and the motor cooling fan blade 21 are installed is in a cantilever state, and the above structure enables the driving shaft 28 to form a two-fulcrum support structure.

[0074] A motor end plate is fixedly provided in the motor cavity 18, and the motor end plate is located between the motor cooling fan blades 21 and the motor rotor 20. The third bearing of the driving shaft 28 is fixedly installed on the motor end plate. The third bearing of the driving shaft 28 is provided with sealing bodies on both sides of the axial direction. One end of the driving shaft 28 extending into the motor cavity 18 is inserted into the third bearing of the driving shaft 28. The first driving shaft bearing 23, the second driving shaft bearing 27 and the third driving shaft bearing 28 on the driving shaft 28 exist at the same time, so that the driving shaft 28 forms a three-set bearing support system, or the first driving shaft bearing 23 is cancelled, and only the second driving shaft bearing 27 and the third driving shaft bearing 28 exist on the driving shaft 28 at the same time, so that the driving shaft 28 forms a two-set bearing support system supported at both ends.

[0075] When the first driving shaft bearing 23, the second driving shaft bearing 27 and the third driving shaft bearing 28 exist at the same time, the driving shaft 28 has three fulcrums, forming a three-point support structure, which is suitable for systems with relatively high power.

[0076] When only the second driving shaft bearing 27 and the third driving shaft bearing 28 are provided on the driving shaft 28 , two fulcrums are formed at both ends of the main shaft, and no bearing is provided between the motor rotor 20 and the driving rotor 3 . This is another two-fulcrum support structure of the driving shaft 28 .

[0077] The integrated housing 32 is also fixedly provided with a whole machine foot 29 , and the whole machine foot is provided with a mounting hole for mounting.

[0078] The whole machine is supported and fixed by the whole machine foot 29 integrally formed on the one-piece shell 32. The whole machine foot is preferably arranged below the one-piece shell 32 and can be arranged at intervals at both ends to achieve stable support for the whole machine, provide convenience for the installation of the whole machine, and save materials. The above structure eliminates the traditional structure of the frame 16, and the overall structure is simple, easy to assemble, and small in size.

Claims

1. An integrated unit structure of a positive displacement blower, characterized in that: The invention comprises an integrated housing (32), wherein the integrated housing accommodates a fan main unit, an exhaust muffler (8) and a drive motor (12), wherein the air inlet end of the exhaust muffler is directly connected to the cylinder exhaust port (5) of the fan main unit, and the gas discharged from the cylinder exhaust port of the fan main unit directly enters the exhaust muffler for silencing treatment, and the drive motor is directly driven coaxially with the driving rotor (3) inside the fan main unit, and a motor cavity (18) and a main unit cylinder (1) are arranged at intervals inside the integrated housing, wherein: a motor stator (19) is fixedly installed in the motor cavity, and a driving shaft (28) and at least one driven shaft (31) are rotatably provided in the main unit cylinder (1), and the driving shaft and the driven shaft are arranged in parallel and at intervals, and the driving shaft axially extends into the motor cavity, and the driving shaft is located in the main unit cylinder A driving rotor (3) is provided on the circumferential outer fixed sleeve of the portion in the body (1), a motor rotor (20) is provided on the circumferential outer fixed sleeve of the portion of the driving shaft located in the motor cavity, a driven rotor (2) is provided on the circumferential outer fixed sleeve of the driven shaft, a motor stator fixedly arranged in the motor cavity can drive the motor rotor to rotate by electromagnetic force, the motor rotor drives the driving shaft to rotate, a set of synchronous gears (24) are respectively provided at the same position in the axial direction of the driving shaft and the driven shaft, the driving shaft can drive the driven shaft to rotate by the synchronous gears, and the rotation of the driving shaft and the driven shaft respectively drives the driving rotor and the driven rotor to rotate, the motor cavity and the driving shaft, the motor rotor and the motor stator therein together form a driving motor, and the main engine cylinder body (1) and the driving shaft, the driven shaft, the driving rotor and the driven rotor therein together form a fan main engine; A connecting passage is provided between the motor cavity and the main engine cylinder (1) to connect the two, a first driving shaft bearing (23) is fixedly arranged in the connecting passage, and a second driving shaft bearing (27) is arranged at the end of the driving shaft located at one end of the driving rotor.

2. The integrated unit structure of the positive displacement blower according to claim 1, characterized in that: The driving rotor and the driven rotor in the main engine cylinder (1) adopt a screw structure.

3. The integrated unit structure of the positive displacement blower according to claim 1, characterized in that: The driving rotor and the driven rotor in the main engine cylinder (1) adopt a Roots-type structure.

4. The integrated unit structure of the positive displacement blower according to claim 1, characterized in that: An exhaust silencer cavity is provided at the lower part of the integrated shell, and the exhaust silencer cavity is arranged in parallel on one radial side of the motor cavity and the main engine cylinder body (1). An exhaust port (9) for the whole machine connected to the inside of the exhaust silencer cavity is formed at one end of the exhaust silencer cavity, and the other end of the exhaust silencer cavity is connected to the cylinder body exhaust port (5) on the side wall of the main engine cylinder body (1). A muffler core (14) is fixedly installed in the exhaust silencer cavity, and a gas channel (15) connected to the exhaust port of the whole machine and the cylinder body exhaust port is formed at the center of the muffler core. The muffler core can perform silencer treatment on the gas passing through the gas channel so that the exhaust noise of the exhaust port of the whole machine is smaller than the exhaust noise of the cylinder body exhaust port. The exhaust silencer cavity and the muffler core therein together form an exhaust silencer.

5. The integrated unit structure of the positive displacement blower according to claim 4, characterized in that: The other end of the exhaust silencer cavity facing the exhaust port of the whole machine is an open structure, and an exhaust silencer end plate (17) is detachably fixedly installed at a corresponding position on the integrated shell, and the exhaust silencer end plate seals and covers the opening structure of the exhaust silencer cavity.

6. The integrated unit structure of the positive displacement blower according to claim 1, characterized in that: A first sealing body (22) and a second sealing body (25) are respectively arranged on both sides of the first bearing of the driving shaft, the first sealing body is located between the motor cavity and the first bearing of the driving shaft, and the second sealing body is located between the first bearing of the driving shaft and the main engine cylinder body (1), the outer circles of the circumferences of the first sealing body and the second sealing body are sealedly connected to the inner side wall of the connecting channel, and the inner circles of the circumferences of the first sealing body and the second sealing body are in dynamic sealing contact with the outer circle of the circumference of the driving shaft.

7. The integrated unit structure of the positive displacement blower according to claim 1, characterized in that: A third sealing body (26) is arranged between the second bearing of the driving shaft and the driving rotor.

8. The integrated unit structure of a positive displacement blower according to claim 1, characterized in that: A first driven shaft bearing and a second driven shaft bearing are respectively arranged at both ends of the driven shaft, and the first driven shaft bearing and the second driven shaft bearing are respectively arranged opposite to the first driving shaft bearing and the second driving shaft bearing on the driving shaft, and a fourth sealing body is arranged between the first driven shaft bearing and the driven rotor, and a fifth sealing body is arranged between the second driven shaft bearing and the driven rotor.

9. The integrated unit structure of a positive displacement blower according to claim 1, characterized in that: The axial outer end of the motor cavity in the integrated shell forms an opening structure, and a motor fan cover (30) is detachably fixedly installed on the opening structure. A cooling fan accommodating space connected to the motor cavity is formed inside the motor fan cover. The end of the driving shaft extends into the cooling fan accommodating space, and a motor cooling fan blade (21) is fixedly installed on the outer circumference of the end of the driving shaft. The motor cooling fan blade can be accommodated in the cooling fan accommodating space with the driving shaft. An axially through ventilation groove is provided between the motor stator (19) and the motor cavity (18) or on the outer wall of the motor cavity (18). One end of the ventilation groove close to the cooling fan accommodating space is connected to the inner side of the cooling fan accommodating space, and the axial outer side of the cooling fan accommodating space is connected to the external space. The other end of the ventilation groove is also connected to the external space. When the motor cooling fan blade rotates, it pushes air to flow along the axial direction of the ventilation groove to take away the heat generated when the motor is running.

10. The integrated unit structure of a positive displacement blower according to claim 1, characterized in that: The outer end of the main engine cylinder (1) in the integrated housing forms an opening structure, on which a fuel tank housing (4) is detachably fixedly mounted, the fuel tank housing sealing the inner cavity of the cylinder body on the side facing the inner cavity of the main engine cylinder body to form an end plate of the main engine cylinder body (1), the interior of the fuel tank housing can accommodate a third sealing body (26), a second bearing (27) of the driving shaft and a synchronous gear (24), the fuel tank housing is a box-type structure, and the axial outer side surface of the fuel tank housing facing away from the main engine cylinder body (1) is fixedly covered with a fuel tank end plate (33).

11. The integrated unit structure of a positive displacement blower according to any one of claims 6 to 8, characterized in that: The first driving shaft bearing and the second driving shaft bearing on the driving shaft and the first driven shaft bearing and the second driven shaft bearing on the driven shaft, at least one bearing on each shaft is a deep groove ball bearing, the first driving shaft bearing and the second driving shaft bearing are respectively arranged on both sides of the driving rotor, and the first driven shaft bearing and the second driven shaft bearing are respectively arranged on both sides of the driven rotor.

12. The integrated unit structure of a positive displacement blower according to claim 1, characterized in that: A motor end plate is fixedly provided in the motor cavity, and the motor end plate is located between the motor cooling fan blades and the motor rotor. A third driving shaft bearing is fixedly installed on the motor end plate, and sealing bodies are provided on both axial sides of the third driving shaft bearing. One end of the driving shaft extending into the motor cavity is inserted into the third driving shaft bearing. The first driving shaft bearing, the second driving shaft bearing and the third driving shaft bearing on the driving shaft exist at the same time, so that the driving shaft forms a three-set bearing support system, or the first driving shaft bearing is cancelled, and only the second driving shaft bearing and the third driving shaft bearing exist at the same time on the driving shaft, so that the driving shaft forms a two-set bearing support system supported at both ends.

13. The integrated unit structure of a positive displacement blower according to claim 1, characterized in that: The integrated housing is also fixedly provided with a whole machine foot (29), and the whole machine foot is provided with a mounting hole for mounting.

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