WO2021056942A1

WO2021056942A1 - Air compressor box body and air compressor provided with box body

Info

Publication number: WO2021056942A1
Application number: PCT/CN2020/073205
Authority: WO
Inventors: 林帮法
Original assignee: 浙江奥利达气动工具股份有限公司
Priority date: 2019-09-24
Filing date: 2020-01-20
Publication date: 2021-04-01
Also published as: CN112628123A

Abstract

An air compressor box body and an air compressor provided with said box body. The box body comprises a main body part (2) and a cylinder base part (3), the main body part (2) being cylindrical, there being a cavity inside the cylinder base part (3), and an inner cavity of the main body part (2) being in communication with the inner cavity of the cylinder base part (3); a necked part (4) is arranged between a main body part inner end (6) and a main body part outer end (5), the inner diameter of the necked part (4) being smaller than the inner diameter of the main body part inner end (6) and the inner diameter of the main body part outer end (5), there being a tapering diameter section (7) having a gradually decreasing inner diameter between the main body part outer end (5) and the necked part (4) and a flared section (8) between the necked part (4) and the main body part inner end (6). The box body has a more rational structural design and can guide a cooling air flow produced by fan blades to better dissipate the heat of a motor, and can also increase the proportion of cooling air flow entering the cylinder base part, so that the cylinder base part can be better cooled.

Description

Air compressor box body and air compressor with the box body

Technical field

The invention relates to an air compressor, in particular to an air compressor box body and an air compressor with the box body.

Background technique

An air compressor is an air source equipment that compresses air. An air compressor generally includes a box, a motor, and a cylinder assembly. The box body includes a main body part and a cylinder seat part that communicate with each other. The motor is installed at the inner end of the main body part. The motor shaft extends into the main body part and is installed with cranks and fan blades. The cylinder assembly includes a cylinder liner, a piston, a valve plate and a cylinder head, and the piston It is installed in the piston cavity in the cylinder liner and connected with the crank through a connecting rod. When the motor rotates, it drives the piston to reciprocate, compresses the air sucked into the cylinder liner, and provides high-pressure gas to the outside.

When the air compressor is working, the motor generates heat, and as the temperature of the motor itself increases, the working efficiency decreases. At the same time, when the air in the cylinder liner is compressed, the compressed gas will also generate heat, causing the temperature of the piston, cylinder liner, valve plate and cylinder head to rise. The increase in the temperature of the piston, cylinder liner, valve plate and cylinder head will, on the one hand, lead to a reduction in the service life of the seal between the piston and cylinder liner. On the other hand, the physical properties of the gas itself determine that the higher the temperature of the gas, the larger the volume, the higher its pressure and the harder it is to compress. When outside air enters the intake cavity and piston cavity, the heat of the cylinder head, valve plate and cylinder liner will be transferred to the air. The higher the temperature of the cylinder liner, valve plate and cylinder head, the greater the air temperature in the piston cavity. , The lower the working efficiency of the air compressor. At the same time, the higher the temperature in the piston cavity, the lower the service life of the seals in the piston cavity, resulting in a decrease in the overall service life of the air compressor. Therefore, the heat dissipation performance of the motor and the cylinder assembly has a greater impact on the working efficiency of the air compressor.

The Chinese patent with the patent number 201811471190.X and the name of a multi-cylinder air compressor discloses a heat dissipation structure for an air compressor. A heat dissipation channel is provided on the cylinder head, and the heat dissipation channel is connected to the cavity of the box. The end surface is provided with heat dissipation holes. A part of the cooling air flow generated when the blades rotates radiates heat to the cylinder liner, valve plate and cylinder head through the heat dissipation channel. Another part of the cooling air flow generated by the wind blade can be discharged through the heat dissipation hole on the end surface of the box body, and in the process, the end of the motor is radiated.

Most of the main body of the existing box body has a straight cylindrical shape, and when the wind blade rotates, the air at the outer end of the main body is sucked in to form an axially flowing cooling airflow. The cooling airflow flows axially. On the one hand, due to the obstruction of the crank, connecting rod and the end surface of the electrode, a large eddy current will be generated between the inner side of the connecting rod and the end surface of the motor, resulting in a large wind resistance. At the same time, the eddy current circulates on the connecting rod and the motor. Between the end faces, the temperature of the cooling airflow that composes the vortex will increase. The existence of the vortex will also prevent other lower temperature cooling airflows from contacting the end of the motor, bringing out the heat of the motor and failing to cool the motor well. On the other hand, the cylinder seat is arranged outside the straight cylindrical main body. When the cooling airflow flows axially, the cooling airflow is not easy to enter the cylinder seat, and the flow of the cooling airflow entering the cylinder seat is small, causing the cylinder assembly to not be cooled. Adequate cooling of the airflow.

Summary of the invention

In view of the shortcomings of the prior art, the purpose of the present invention is to provide an air compressor housing with a more reasonable structure design, which can guide the cooling air flow generated by the blades to better dissipate the heat of the motor, and at the same time increase the access to The proportion of the cooling air flow in the cylinder seat part enables the cylinder assembly to be better cooled.

The above-mentioned technical purpose of the present invention is achieved through the following technical solutions: an air compressor housing body, comprising a main body part and a cylinder base part, the main body part is cylindrical, the cylinder base part is provided with a cavity, and the main body part inner cavity It communicates with the inner cavity of the cylinder seat. A constriction is arranged between the inner end of the main body and the outer end of the main body. The inner diameter of the constriction is smaller than the inner diameter of the inner end of the main body and the inner diameter of the outer end of the main body. It is a reduced diameter section with a gradually reduced inner diameter, and a flared section is formed between the necked portion and the inner end of the main body.

Through the above technical solution, the inner diameter of the reduced diameter section is gradually reduced, so that the cooling air flow generated by the blades installed at the outer end of the main body can be guided by the inner wall of the reduced diameter section, so that part of the cooling air flow can be on the inner wall of the reduced diameter section. Under the action, it flows to the outer surface of the motor stator coil to cool the end of the motor stator. At the same time, since the inner cavity of the cylinder seat and the main body is connected, after the neck is set, the lower end of the cylinder seat is more extended into the main body, so that the flow area between the cylinder seat and the main body is increased, thereby making The cooling airflow flowing on the axis can more easily enter the cylinder base, increasing the proportion of the cooling flow of the cylinder base, and effectively improving the cooling effect of the cylinder assembly.

A flaring section is arranged between the constricted neck portion and the inner end of the main body, and the end of the flaring section close to the constricted neck has a small inner diameter and the end close to the motor has a larger inner diameter. The space formed between the inner wall of the flared end and the outer surface of the motor stator coil increases in the axial direction, the flow rate of the cooling airflow decreases after entering the space, and the static pressure increases. The reduction of the flow rate enables sufficient heat exchange between the cooling airflow and the outer surface of the motor stator coil, and takes away the heat from the electronic coil. The reduction of the flow rate can also reduce the generation of eddy currents and the intensity of eddy currents. The static pressure increases, so that the cooling air flow there can be smoothly discharged from the main body.

In addition, the diameter-reducing arrangement of the main body can better improve the longitudinal compression resistance of the main body. When the air compressor is working, the piston is always in a state of reciprocating rocking motion. Although it is balanced by the crank, a small part of the longitudinal impact force is still transmitted to the main body. The two ends of the main body are large and the middle is small. The overall shape is an hourglass. Compared with a straight cylinder, when the main body is subjected to longitudinal pressure (vertical to the axis of the main body), the main body is less prone to deformation and avoids the cross-section from being round to ellipse. Shape, improve the stability at work.

Preferably, the inner diameter of the outer end of the main body is larger than the inner diameter of the inner end of the main body, the ratio of the inner diameter of the necked portion to the inner diameter of the outer end of the main body is between 1: 1.15 and 1.30, and the ratio of the inner diameter of the reduced diameter to the inner diameter of the main body is 1:1.03 Between ~ 1.20.

Through the above technical solution, the inner diameter of the outer single part of the main body is increased, and a fan blade with a larger outer diameter can be installed at the outer end of the main body, thereby increasing the total flow of the cooling airflow generated when the fan rotates. After the total flow rate of the cooling air flow is increased, the flow rate for cooling the motor will increase accordingly, and the flow rate for cooling the cylinder assembly will also increase, so as to achieve a better heat dissipation effect.

The ratio of the reduced diameter section to the inner diameter of the outer end of the main body is between 1: 1.15 and 1.30, which can ensure a certain compression ratio when the cooling air flow generated by the fan blade flows in the axial direction, thereby ensuring the air pressure. On the one hand, the cooling airflow can flow to the cylinder seat more smoothly, and the flow distribution ratio of the cylinder seat is increased. On the other hand, as the wind pressure increases, the corresponding cooling air flow rate will also increase, so that the cooling air can be accurately injected between the outer surface of the stator coil and the inner wall of the flaring section, thereby providing better heat dissipation to the outer surface of the stator coil effect. And within this range, a better wind pressure can be ensured, and the overall wind resistance will not be too large, affecting the air intake at the outer end of the main body, and the actual heat dissipation effect is better.

The ratio of the reduced diameter section to the inner diameter of the inner end of the main body is between 1:1.03 and 1.20, so that the space between the flaring section and the stator coil is gradually increased, thereby reducing the wind speed, so that the cooling airflow can fully contact the outer surface of the stator coil. Heat, improve cooling efficiency.

Preferably, the constricted portion is close to the inner end of the main body, and the center of the cylinder seat is between the constricted portion and the outer end of the main body.

Through the above technical solution, most of the cylinder seat part is at the outer end of the necked portion, so that the cooling air flow generated by the fan blade can be discharged as much as possible through the heat dissipation flow channel on the cylinder head and the valve plate. The heat dissipation effect of the cylinder assembly is improved. Relatively speaking, the work efficiency of the air compressor improved by reducing the temperature of the cylinder assembly is greater than the work efficiency of the air compressor improved by reducing the temperature of the motor.

Preferably, a motor shaft seat is arranged in the box body, and the motor shaft seat is connected to the inner wall of the constricted portion through spokes.

Through the above technical solution, the motor shaft seat can be arranged to fix and support the motor shaft. When the motor shaft drives the piston to reciprocate, the vibration and swing generated by the piston will act on the motor shaft seat through the motor shaft. The inner diameter near the constriction is small, and the spokes are arranged there to reduce the length of the spokes and save materials. On the other hand, the spokes can transmit the impact force to the outer wall of the box on both sides of the neck after being stressed, so as to achieve the purpose of dispersing the force and improve the overall structural strength of the box.

Preferably, the cross section of the cylinder seat is polygonal or circular with more than five sides.

Through the above technical solution, because the piston cavity section is round, the cylinder seat part is outside the cylinder liner, and the cylinder seat part is polygonal or circular with more than five sides, so that a space is formed between the inner wall of the cylinder seat part and the outer wall of the cylinder liner. The annular air flow channel makes the distance between the outer wall of the cylinder liner and the inner wall of the cylinder seat substantially the same. When the cooling airflow enters between the two, the cooling airflow can cool the surface of the cylinder liner more uniformly, so as to achieve a better cooling effect.

Preferably, the inner wall of the reduced diameter section is conical surface one, and the half apex angle α of conical surface one is between 5° and 20°.

Through the above technical solution, the inner wall of the reduced-diameter section is a conical surface. When the cooling airflow is guided, the inner wall of the reduced-diameter section does not cause major obstruction to the cooling airflow, and the flow is relatively smooth. The half apex angle of the cone surface 1 is small, the cross-sectional area of the reduced diameter section changes little, and the cooling airflow flows smoothly and regularly.

Preferably, the inner wall of the flaring section is a second cone surface, and the half apex angle β of the second cone surface is between 5° and 15°.

Through the above technical solution, the inner wall of the flaring section is a conical surface, and when the corresponding cooling air flows from the necked portion to the inner end of the main body, the flow rate gradually decreases, the pressure gradually rises, and the flow becomes more regular, which can produce better heat dissipation effect.

Preferably, feet are provided on the lower outer wall of the reduced diameter section.

Through the above technical solution, the support foot is arranged at this place, roughly at the lower part of the outer end of the cylinder seat, so that the impact force generated by the piston during operation can be directly transmitted to the support foot, so that the overall structural rigidity of the box body is better. The vibration is smaller.

Through the above technical solution, by improving the box structure, the effect of changing the cooling air distribution ratio is achieved, increasing the proportion of the cooling air flowing to the cylinder part, and correspondingly reducing the proportion of the cooling air flowing to the motor end. At the same time, by guiding the airflow flowing axially in the main body, the cooling airflow is directly directed to the end face of the stator coil of the linear motor, so that the cooling airflow is fully utilized and the cooling effect of the motor is ensured.

Another object of the present invention is to provide an air compressor, which has better heat dissipation performance, lower temperature during operation of the cylinder assembly and motor, high working efficiency and long service life.

The above technical objectives of the present invention are achieved through the following technical solutions: an air compressor, including a motor and a cylinder assembly, the cylinder assembly includes a cylinder liner, a piston, a valve plate and a cylinder head, the cylinder head and the valve plate are provided with and The heat dissipation channel communicating with the inner cavity of the cylinder base further includes the above-mentioned air-compression case body, the inner end of the main body is connected to the end of the motor, the motor includes a stator and a rotor, a stator coil is wound on the stator, and a motor shaft is pierced on the rotor. The motor shaft extends into the box and is equipped with a crank and a fan blade. The crank and the piston are connected by a connecting rod. The end of the stator coil extends into the inner end of the main body. The inner wall of the reduced diameter section points to the outer surface of the end of the stator coil. A heat dissipation hole is opened on the end or the motor.

Through the above technical solution, the arrangement of the reduced diameter section and the necked portion can guide the cooling airflow. On the one hand, the axially flowing cooling airflow is blown toward the outer surface of the stator coil of the motor, and then follows the outer surface of the stator coil and the inside of the main body. Flow between the inner walls of the end to dissipate heat from the electronic coil, and finally exhaust from the end of the main body or the heat dissipation hole on the motor housing to take out the heat generated by the motor.

This arrangement of the main body has a better heat dissipation effect than the straight cylindrical main body. Since the stator and rotor of the motor are solid, the cooling air cannot pass through, and the heat dissipation holes can only be opened on the inner end surface of the electrode shell or the main body. When a straight cylindrical main body is used, the cooling airflow flows axially, and the cooling airflow in the central part of the main body directly impacts the end face of the stator or rotor of the motor, and then flows to the outside of the stator and rotor. This will generate eddy currents between the connecting rod and the end face of the motor, and at the same time, eddy currents will also be generated at the outer and rear ends of the stator end face, that is, the outer surface of the stator coil. After the eddy current is generated on the outer surface of the stator coil, it will affect the contact between the axially flowing cooling air flow near the inner wall portion of the main body and the outer surface of the stator coil, thereby affecting the heat dissipation of the motor.

Using a main body with a constricted neck and constricted section can guide the cooling airflow flowing in the axial direction, and guide the cooling airflow through the lower part of the constricted section, so that the cooling airflow at the lower part of the main body flows upward and toward the middle of the main body. , Pointing to the outer surface of the stator coil of the motor, and at the same time, by guiding the airflow flowing in the axial direction, the axial airflow can enter more into the cylinder base, increasing the proportion of the cooling airflow entering the cylinder base, without affecting the heat dissipation of the motor In the case of performance, improve the cooling effect of the cylinder assembly.

The heat dissipation hole can be arranged on the inner end surface of the main body, or on the motor housing. The cooling holes are arranged on the end surface of the main body, and the cooling air flow can flow out axially, and the flow is smoother. When the heat dissipation holes are arranged on the motor casing, the cooling airflow flows along the outer wall of the electronic coil for a longer distance, and the heat exchange is more sufficient, but the wind resistance is relatively large when flowing relatively.

Preferably, the inner diameter of the outer end of the main body is greater than the inner diameter of the inner end, and the outer diameter of the blade is greater than the outer diameter of the motor.

Through the above technical solution, the inner diameter of the outer end is increased and the fan blades with a larger outer diameter are used. At the same motor speed, the fan blades can suck more cooling airflow for cooling, thereby improving the cooling effect of the motor and cylinder components .

Preferably, the cylinder head is provided with an air inlet cavity and an air outlet cavity, the air inlet cavity is located on the side of the cylinder head close to the motor, and the air outlet cavity is located on the side of the cylinder head away from the motor.

Through the above technical solution, the presence of the crank and the connecting rod will hinder the flow of the cooling air flow. The cooling air flow in the cylinder head at the outer end of the connecting rod will be greater than the cooling air flow on the other side of the cylinder head. The cylinder body, valve plate and cylinder head on the outer side of the neck have a better cooling effect. At the same time, when the air compressor is working, the compressed high-temperature gas will enter the air outlet cavity, so that the temperature of the cylinder head on the side of the air outlet cavity is higher than the temperature on the other side of the cylinder head. The air outlet cavity side of the cylinder head is located above the cylinder seat at the outer end of the constricted neck, so that more cooling airflow can be used to fully cool the higher temperature side of the cylinder head, which improves the utilization rate of the cooling airflow and improves the heat dissipation capacity.

Preferably, the ratio of the volume of the air inlet cavity to the volume of the air outlet cavity is between 1: 1.7 and 2.6; or the ratio of the inner wall area of the inlet cavity to the inner wall area of the outlet cavity is between 1: 1.3 and 2.2.

With the above technical solution, due to the limited volume of the cylinder head, the increase in the volume of the air outlet cavity will reduce the volume of the air inlet cavity to a large extent. At the same time, for a simple and regular chamber structure, such as a chamber with a circular arc or polygonal cross section, the larger the volume, the larger the corresponding inner wall area. The volume of the outlet cavity is larger than the volume of the inlet cavity, so that the inner wall area of the outlet cavity is larger than the inner wall area of the inlet cavity, so that after the compressed high temperature gas enters the outlet cavity, more heat can be transferred to the cylinder head, and then pass through The cylinder head emits to prevent the compressed gas with a higher temperature from entering the gas storage tank after compression, which causes the gas temperature and pressure in the gas storage tank to increase, and reduces the gas efficiency of the air compressor.

Correspondingly, protrusions, bumps, etc. protruding to the center of the outlet cavity can also be provided in the outlet cavity to increase the inner wall area of the outlet cavity, thereby increasing the heat exchange area, but without increasing the volume of the outlet cavity, making the volume of the outlet cavity equal to Or less than the volume of the air inlet cavity.

Preferably, fan blades are provided on the end face of the rotor.

Through the above technical solution, the heat dissipation condition of the inner wall of the stator coil can be improved. Generally speaking, the length at both ends of the stator coil is greater than the length of the rotor. After the rotor is provided with fan blades, the fan blades will also be inside the stator coils. When the rotor rotates, the fan blades generate centrifugal airflow, which can cool the stator coils, thereby further improving the heat dissipation performance of the stator coils.

Preferably, a recess is provided on the upper surface of the valve plate facing the air inlet cavity and the air outlet cavity.

Through the above technical solution, the overall height of the cylinder head can be reduced. Since air compressors generally have certain requirements on the volume of the air inlet cavity and the air outlet cavity, after a recess is provided on the surface of the valve plate, the depth of the air inlet cavity and outlet cavity on the corresponding cylinder head can be reduced accordingly, thereby reducing the cylinder The overall height of the cover. At the same time, the thickness of the cylinder head is reduced after the recess is provided, and the heat generated when the piston compresses the air can be transferred to the cylinder head more quickly, which is convenient for cooling.

Preferably, a valve plate limiting block is installed on the upper surface of the valve plate, and a plurality of heat dissipation slopes are provided on the valve plate limiting block.

Through the above technical solution, the arrangement of multiple heat dissipation slopes can increase the surface area of the limit block, thereby increasing the heat exchange area, facilitating the heat exchange between the limit block and the compressed air in the intake cavity, thereby reducing the limit block and valve. The temperature of the board.

Preferably, boxes are installed at both ends of the motor.

Compared with the prior art, the present invention has the beneficial effect that by improving the internal structure of the box, the cooling airflow flowing in the axis can act on the outer surface of the motor stator, thereby improving the heat dissipation performance of the stator coil. At the same time, the flow distribution of the cooling air flow is adjusted to increase the proportion of the cooling air flow to the cylinder block, improve the heat dissipation capacity of the cylinder assembly, reduce the temperature of the cylinder assembly during operation, improve the work efficiency and the life of the seal, and reduce the motor end The eddy current strength of the part facilitates the heat dissipation of the motor.

Description of the drawings

Figure 1 is a perspective view of the outer end of the main body in the first embodiment;

2 is a perspective view of the inner end of the main body in the first embodiment;

Fig. 3 is a schematic diagram of a three-dimensional cross-section of the first embodiment;

Figure 4 is a schematic cross-sectional view of the first embodiment;

Fig. 5 is a schematic diagram of a transverse cross-section of the box body after connection in the first embodiment;

Figure 6 is a perspective view of the second embodiment;

Figure 7 is a schematic cross-sectional view of the second embodiment;

Figure 8 is an exploded view of the second embodiment;

Figure 9 is a perspective view of the rotor in the second embodiment;

Figure 10 is a perspective view of the cylinder head in the second embodiment when viewed from below;

Figure 11 is an exploded view of the valve plate limiting block in the second embodiment.

Reference signs: 1. Box body; 2. Main body; 3. Cylinder seat; 4. Constriction; 5. Outer end of main body; 6. Inner end of main body; 7. Diameter reduction section; 8. Flaring section 9. Motor shaft seat; 10. Spokes; 11. Motor; 12. Cylinder assembly; 13. Cylinder liner; 14. Piston; 15. Valve plate; 16. Cylinder head; 17. Heat dissipation runner; 18. Stator; 19 20. Stator coil; 21. Motor shaft; 22. Crank; 23. Fan blade; 24. Connecting rod; 25. Cooling hole; 26. Inlet cavity; 27. Outlet cavity; 28. Fan blade; 29. Piston cavity; 30, seal; 31, muffler; 32, conical surface one; 33, conical surface two; 34, feet; 35, recessed part; 36, valve limit block; 37, cooling slope; 38, valve sheet.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

This specific embodiment is only an explanation of the present invention, and is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contribution as needed, but as long as the rights of the present invention The scope of the requirements is protected by the patent law.

Embodiment one, an air compressor case body

As shown in Figures 1 to 5, an air compressor housing includes a main body 2 and a cylinder seat 3. The main body 2 is cylindrical with a circular longitudinal section. The cylinder seat 3 is provided with a cavity, and the inner cavity of the cylinder seat 3 and the inner cavity of the main body 2 are connected. The cylinder seat 3 is integrally provided outside the main body 2, and the inner cavity of the cylinder seat 3 is in communication with the inner cavity of the main body 2. The two ends of the main body 2 are respectively the inner end 6 of the main body and the outer end 5 of the main body. The inner end 6 of the main body faces the motor 11 and is matched and connected with the motor 11. The central part of the main body 2 is provided with a constricted portion 4, and the inner diameter of the constricted portion 4 is smaller than the inner diameter of the inner end 6 of the main body, and at the same time, is smaller than the inner diameter of the outer end 5 of the main body. Between the outer end 5 of the main body and the neck 4 is a reduced diameter section 7. The inner wall of the reduced diameter section 7 is a conical surface 32. The inner diameter of the reduced diameter section 7 gradually decreases from the outside to the inside along the axis of the main body 2. The ratio of the inner diameter of the constricted portion 4 to the inner diameter of the outer end of the main body 2 is between 1:1.15 and 1.30, and the half apex angle α of the conical surface 32 is between 10° and 20°. Between the constricted portion 4 and the inner end 6 of the main body portion is a flaring section 8. The inner wall of the flaring section 8 is a conical surface 33, and the inner diameter of the end of the flaring section 8 near the neck 4 is smaller than the inner diameter of the flaring section 8 near the inner end 6 of the main body. The ratio of the inner diameter of the constricted portion 4 to the inner diameter of the inner end of the main body 2 is between 1:1.03 and 1.20, and the half apex angle β of the second conical surface 33 is between 5 and 15 degrees. The diameter of the main body 2 is reduced, so that the main body 2 is in a non-straight cylindrical shape, and the overall structural strength of the main body 2 is higher. When the main body 2 is subjected to radial pressure, the deformation range is smaller, which makes the air compressor work more stable. At the same time, in order to be able to better support the box 1, the lower outer wall of the reduced diameter section 7 is provided with a foot 34. The support is provided there, roughly at the lower part of the outer end of the cylinder seat 3, so that the piston 14 is produced during operation. The impact force can be directly transmitted to the feet 34, so that the overall structural rigidity of the box body 1 is better, and the vibration generated during work is smaller.

The inner diameter of the outer end 5 of the main body is larger than the inner diameter of the inner end 6 of the main body. This arrangement enables the outer end 5 of the main body to install a fan blade 23 with a larger outer diameter, so that when the motor 11 drives the fan blade 23 to rotate, more air can be drawn in to form a cooling airflow for cooling the motor 11 and the cylinder assembly. Thereby, the cooling effect is improved, and the operating temperature of the motor 11 and the cylinder assembly 12 is reduced.

A motor shaft seat 9 is provided in the box 1, and the motor shaft seat 9 is connected to the inner wall near the neck 4 through the spokes 10. The spokes 10 are arranged here. On the one hand, since the inner diameter of the constricted portion 4 is the smallest, the length of the spokes 10 can be reduced and materials can be saved. On the other hand, the reduced diameter section 7 and the flared section 8 are located on both sides of the constricted portion 4, and the spokes 10 are also connected there, so that the connection between the spoke 10 and the constricted portion 4 forms a Y-shaped structure. When the spoke 10 is impacted by the motor shaft base 9, the Y-shaped structure can disperse the impact force to the reduced diameter section 7 and the flared section 8 on both sides of the spoke 10, thereby improving the overall structural strength and box The anti-vibration ability of the body 1 during work reduces the vibration generated by the air compressor during work. The number of spokes 10 is 7, and the angle between two adjacent spokes 10 is approximately the same. Except for the angle between the uppermost two spokes 10, which needs to be determined according to the outer diameter of the cylinder sleeve 13, the other relative angles The included angle between two adjacent spokes 10 is approximately between 45 and 55 degrees, and the adjacent included angles are basically the same.

The constriction 4 is close to the inner end 6 of the main body 2, and the center of the cylinder seat 3 is between the constriction 4 and the outer end 5 of the main body, so that the cylinder seat 3 is mostly located outside the constriction 4. Due to the existence of the connecting rod 24, the crank 22, the spokes 10 and the motor shaft seat 9, the cooling airflow flowing in the axial direction will be greatly hindered. The flow field inside the neck 4 is more complicated, and the wind resistance is relatively large when the cooling airflow flows. . The flow field at the outer end 5 of the constricted portion 4 is relatively regular. Due to the existence of the constricted section 7, the cooling air flow from the lower part of the main body 2 will be guided to the middle of the main body 2 to facilitate the cooling air flow into the cylinder seat 3 , Thereby increasing the proportion of the cooling airflow in the cylinder seat part 3.

The cylinder base 3 has an octagonal cross-section. After the cylinder liner 13 is installed, the cooling airflow entering the cylinder base 3 can more evenly surround the outer wall of the piston cavity 29 to cool the cylinder liner 13. Since the cross-section of the piston chamber 29 is generally circular, the inner wall of the cylinder seat part 3 has an octagonal cross-section, which can better surround the outside of the piston chamber 29 and between the outer surface of the outer wall of the piston chamber 29 and the cross-section of the cylinder seat part 3 A near-annular area is formed, so that the cooling airflow entering the cylinder seat portion 3 can be more evenly distributed in the annular area, thereby producing a better and more uniform cooling effect on the cylinder liner 13.

In actual use, the size of a box 11 with good actual use effect is roughly as follows, the inner diameter of the outer end of the main body 22 is 136mm, the inner diameter of the neck 44 is 110mm, the inner diameter of the inner end of the main body 22 is 124mm, and the tapered surface is half of one. The apex angle α is 14.6°, and the half apex angle β of the second tapered surface is 11.8°. The dimensions of another box 11 with better practical results are as follows, the inner diameter of the outer end of the main body 22 is 168mm, the inner diameter of the neck 44 is 136mm, the inner diameter of the inner end of the main body 22 is 149mm, and the half-vertex angle α of the tapered surface 1 is 17.4° , The half apex angle β of the second tapered surface is 10.6°.

Embodiment two, an air compressor,

As shown in Figures 6-11, an air compressor includes a motor 11, a casing 1 and a cylinder assembly 12 in the first embodiment. A box 1 is installed at each end of the motor 11.

The motor 11 includes a stator 18 and a rotor 19. A stator coil 20 is wound on the stator 18, and the end of the stator coil 20 protrudes from the stator 18. The rotor 19 is installed in the stator 18, and the motor shaft 21 passes through the rotor 19. Both ends of the motor shaft 21 penetrate the rotor 19 and protrude from the ends of the stator 18 and the stator coil 20. A box 1 is installed at both ends of the stator 18 respectively, and the two boxes 1 are fixed by bolts, so that the motor 11 is clamped between the two boxes 1. The motor shaft 21 extends into the main body 2 from the inner end 6 of the main body. A crank 22 and a fan blade 23 are mounted on the motor shaft 21 from the inside to the outside. When the motor 11 rotates, the crank 22 and the fan blade 23 rotate. When the fan blade 23 rotates, the air from the outer end 5 of the main body part is sucked into the main body part 2 to form a cooling airflow for the motor 11 and the cylinder assembly 12 to dissipate heat. The heat of the motor 11 is mainly concentrated on the stator 18, which has a solid structure, and a rotor 19 is installed inside the stator 18, and the rotor is also a solid structure. Therefore, the motor 11 can only dissipate heat through the end surface of the stator 18, the end of the stator coil 20 and the outer surface of the stator 18.

The cylinder assembly 12 includes a cylinder sleeve 13, a piston 14, a valve plate 15 and a cylinder head 16. A piston cavity 29 is opened in the cylinder sleeve 13, and a piston 14 is installed in the piston cavity 29. A seal 30 is provided between the piston 14 and the cylinder liner 13, and the seal 30 seals the cylinder liner 13 and the piston 14. The valve plate 15 and the cylinder head 16 are provided with a heat dissipation channel 17, which communicates with the inner cavity of the cylinder seat 3 and the inner cavity of the box 1, so that the cooling air flow generated by the fan blade 23 can pass through the valve plate 15 and the cylinder The cover 16 enables the valve plate 15 and the cylinder head 16 to be in contact with the cooling air flow, so that the temperature can be effectively reduced.

The cylinder assembly 12 is installed on the cylinder seat part 3 of the box 1, wherein the cylinder liner 13 is installed in the cylinder seat part 3, and the valve plate 15 and the cylinder head 16 are installed on the upper end of the cylinder seat part 3 and the cylinder liner 13. The piston 14 is connected to the crank 22 through the connecting rod 24. When the motor 11 rotates, the connecting rod 24 drives the piston 14 to move up and down in the cylinder sleeve 13 to compress the gas in the piston cavity 29.

The end of the stator coil 20 also extends into the inner end 6 of the main body, and the end of the stator coil 20 is inside the flared section 8. At the same time, the inner wall of the reduced diameter section 7 points to the outer surface of the end of the stator coil 20, and a part of the cooling airflow is directed to the outer surface of the stator coil 20. A heat dissipation hole 25 is provided on the end surface of the inner end 6 of the main body, and the cooling airflow entering between the outer surface of the end of the stator coil 20 and the inner wall of the flaring section 8 is finally discharged from the heat dissipation hole 25.

Fan blades 28 are also provided on the end surface of the rotor 19. The fan blades 28 are located inside the stator coil 20. When the rotor 19 rotates, the fan blades 28 there rotate together, thereby generating a centrifugal airflow inside the stator coil 20. The centrifugal airflow flows around the inner surface of the stator coil 20 and takes away the heat from the inner surface of the end of the stator coil 20. The presence of the fan blade 28 can also continuously exhaust the air flow inside the end of the stator coil 20, realize the air flow circulation between the inside of the stator coil 20 and the outside of the stator coil 20, and improve the heat dissipation efficiency of the stator 18 of the motor 11.

The arrangement of the reduced-diameter section 7 whose inner diameter is gradually reduced makes the cooling air flow in the lower half of the main body 2 deviate toward the middle of the main body 2 when flowing. The cooling air flow in the lower half of the main body 2 shifts to the middle of the main body 2, and the corresponding air flow in the middle and upper part of the main body 2 will also be shifted upwards, so that more cooling air flow can enter the cylinder seat 3 and increase the entrance. The proportion of the cooling air flow of the cylinder seat part 3 improves the cooling effect of the cylinder assembly 12.

The inner diameter of the outer end 5 of the main body is greater than the inner diameter of the inner end 6 of the main body, and the outer diameter of the wind blade 23 is greater than the outer diameter of the motor 11. Increasing the inner diameter of the outer end 5 of the main body can install a fan 23 with a larger outer diameter. The outer diameter of the fan 23 is larger. Driven by the motor 11 at the same speed, more cooling airflow can be generated. The cooling air flow for heat dissipation will increase, and the cooling flow for cooling the cylinder assembly will also increase, thereby improving the heat dissipation effect of the motor 11 and the cylinder assembly 12, reducing the working temperature of the motor 11 and the cylinder assembly, improving work efficiency, and increasing the cylinder liner The service life of the seal 30 between 13 and the piston 14.

The cylinder head 16 is provided with an air inlet chamber 26 and an air outlet chamber 27. An inlet valve plate is installed on the lower surface of the valve plate 15 opposite to the air inlet cavity 26, and an outlet valve is installed on the upper surface of the valve plate 15 opposite to the air outlet chamber 27.阀片38。 Valve plate 38. When the piston cavity 29 takes in air, the intake valve plate opens, and outside air enters the piston cavity 29 through the intake cavity 26. When the piston chamber 29 is exhausted, the outlet valve plate opens, and the compressed air in the piston chamber 29 enters the outlet chamber 27 through the outlet valve plate. Both the outlet cavity 27 and the inlet cavity 26 are located directly above the piston cavity 29. The air inlet cavity 26 is located on the side of the cylinder head 16 close to the motor 11, and the air outlet cavity 27 is located on the side of the cylinder head 16 away from the motor 11. The volume of the outlet cavity 27 is greater than the volume of the inlet cavity 26, so that the inner wall area of the outlet cavity 27 is larger than the inner wall area of the inlet cavity 26. According to a large number of tests, when the ratio of the volume of the inlet chamber 26 to the outlet chamber 27 is between 1:1.7 to 2.6, or the ratio of the inner wall area of the inlet chamber 26 to the outlet chamber 27 is between 1:1.3 to 2.2, The cylinder head 16 has better heat dissipation performance, and the temperature of the cylinder head 16 is lower when it is working. For example, the air inlet cavity 26 and the air outlet cavity 27 can be arranged according to the following ratio, the ratio of the inner wall area of the air inlet cavity 26 and the air outlet cavity 27 is 1:1.64, and the volume ratio of the air inlet cavity 26 and the air outlet cavity 27 is 1:1.92; Or the ratio of the area of the inner wall of the inlet chamber 26 and the outlet chamber 27 is 1:1.93, and the ratio of the volume of the inlet chamber 26 to the outlet chamber 27 is 1:2.48.

The air intake cavity 26 and the air outlet cavity 27 are arranged in this way because, on the one hand, the cooling air flow of the cylinder head 16 near the outer end 5 of the main body is relatively large, and the cooling air flow of the cylinder head 16 close to the inner end 6 of the main body is relatively small. At the same time, during the actual operation of the air compressor, the temperature on the side of the air outlet cavity 27 of the cylinder head 16 is higher than the temperature on the side of the air inlet cavity 26. Setting the side of the outlet cavity 27 with a higher temperature of the cylinder head 16 above the cylinder seat 3 with a larger flow of cooling air can make full use of the larger cooling air flow there to cool the side of the outlet cavity 27 of the cylinder head 16 sufficiently. The cooling air flow is used to reduce the overall temperature of the cylinder head 16. A muffler is also installed on the cylinder head 16. The muffler is installed inside the cylinder head 16 and mostly above the motor 11, so that the cylinder head 16 and the motor 11 shield and protect the muffler 31 to prevent the muffler from being used. 31 collides with other objects, causing damage.

A recess 35 is provided on the upper surface of the valve plate 15 facing the air inlet chamber 26 and the air outlet chamber 27. The recess 35 can be provided on the valve plate 15 by setting the recess 35 on the valve plate 15 so as to reduce the cylinder head 16. The depths of the intake chamber 26 and the exhaust chamber 27 are such that the overall height of the cylinder head 16 can also ensure the volume of the intake chamber 26 and the exhaust chamber 27 with a corresponding reduction. At the same time, after the valve plate 15 is provided with the recess 35, the thickness of the valve plate 15 at the recess 35 is reduced, so that the heat generated during compression of the gas in the piston 14 cavity can be more quickly transferred to the cylinder inlet cavity 26 or the outlet cavity 27 Then, the air in the air inlet cavity 26 or the air outlet cavity 27 is transferred to the cylinder head 16 for heat dissipation, and a better heat dissipation effect is obtained. Correspondingly, a plurality of heat dissipation slopes 37 can be provided on the valve plate limit block 36 installed on the upper surface of the valve plate 15 to increase the heat exchange area, thereby speeding up the transfer of the temperature on the valve plate 15 to the compressed air in the air outlet chamber 27, and Finally, the heat is transferred to the cylinder head 16 for dissipation.

By changing the box structure, the air compressor using the box in the first embodiment is compared with the original air compressor with a straight cylindrical main body. It uses the same model of motor and cylinder assembly and works under the same working conditions. Below, the operating parameters for both continuous and stable operation are shown in the following table:

It can be seen from the above table that a constriction 4 is provided on the main body 2, and a constriction 7 is provided between the outer end of the main body 2 and the constriction 4, which can greatly increase the flow rate of the cooling airflow to the cylinder. At the same time, due to the arrangement of the reduced diameter section 7, the temperature rise of the motor 11 will not be greatly increased, and the heat loss will be small. In addition, by increasing the inner diameter of the outer end of the main body 2 and the inner diameter of the fan blade 23, the total cooling air flow is significantly increased, the working temperature rise of the cylinder assembly after the improvement is greatly reduced, and the service life of the seal 30 is greatly increased.

The above descriptions are merely exemplary embodiments of the present invention, and are not used to limit the protection scope of the present invention, which is determined by the appended claims.

Claims

An air compressor case body, comprising a main body part (2) and a cylinder seat part (3), the main body part (2) is cylindrical, the cylinder seat part (3) is provided with a cavity, and the main body part (2) is The cavity and the inner cavity of the cylinder seat (3) communicate with each other, and are characterized in that: a constriction (4) is arranged between the inner end (6) of the main body and the outer end (5) of the main body, and the inner diameter of the constriction (4) is smaller than The inner diameter of the inner end (6) of the main body and the inner diameter of the outer end (5) of the main body. Between the outer end of the main body (5) and the necked portion (4) is a reduced diameter section (7) with a gradually reduced inner diameter. Between) and the inner end (6) of the main body is a flaring section (8).
An air compressor case body according to claim 1, characterized in that the inner diameter of the outer end (5) of the main body is greater than the inner diameter of the inner end (6) of the main body, and the inner diameter of the necked portion (4) is more than the inner diameter of the outer end (5) of the main body. ) The ratio of the inner diameter is between 1:1.15 and 1.30, and the ratio between the inner diameter of the neck portion (4) and the inner diameter of the main body portion (6) is between 1:1.03 and 1.20.
An air compressor case body according to claim 1, characterized in that: the necking part (4) is close to the inner end (6) of the main body part, and the center of the cylinder seat part (3) is at the necking part (4) and the main body part. Between the outer ends (5).
The air compressor case body according to claim 1, characterized in that: a motor shaft seat (9) is arranged in the case body (1), and the motor shaft seat (9) passes through the spokes (10) and the neck portion ( 4) The inner wall connection at the location.
An air compressor cabinet body according to claim 4, characterized in that the number of spokes (10) is seven.
The air compressor casing according to claim 1, wherein the cross section of the cylinder seat (3) is polygonal or circular with more than five sides.
The air compressor cabinet body according to claim 1, wherein the inner wall of the reduced diameter section (7) is a cone surface (32), and the half apex angle α of the cone surface (32) is between 10° and 20°. °between.
An air compressor cabinet body according to claim 1 or 7, characterized in that the inner wall of the flaring section (8) is two cone surfaces (33), and the half apex angle β of the second cone surface (33) is between 5 and Between 15°.
The air compressor case body according to claim 1, wherein the outer wall of the lower side of the reduced diameter section (7) is provided with a supporting foot (34).
An air compressor includes a motor (11) and a cylinder assembly (12). The cylinder assembly (12) includes a cylinder liner (13), a piston (14), a valve plate (15) and a cylinder head (16), and the cylinder head ( 16) and the valve plate (15) are provided with a heat dissipation channel (17) communicating with the inner cavity of the cylinder seat part (3), which is characterized in that it further comprises the air compressor case according to any one of claims 1-9 Body (1), the inner end (6) of the main body is connected with the end of the motor (11), the motor (11) includes a stator (18) and a rotor (19), a stator coil (20) is wound on the stator (18), and the rotor (19) There is a motor shaft (21) through the upper part, the motor shaft (21) extends into the box (1) and is installed with a crank (22) and a fan blade (23), between the crank (22) and the piston (14) They are connected by a connecting rod (24), the end of the stator coil (20) extends into the inner end (6) of the main body, the inner wall of the reduced diameter section (7) points to the outer surface of the end of the stator coil (20), and the inner end (6) of the main body ) Or the motor (11) is provided with a heat dissipation hole (25).
An air compressor according to claim 10, characterized in that the inner diameter of the outer end (5) of the main body is greater than the inner diameter of the inner end (6), and the outer diameter of the blade (23) is greater than the outer diameter of the motor (11).
An air compressor according to claim 10, characterized in that: the cylinder head (16) is provided with an air inlet cavity (26) and an air outlet cavity (27), and the air inlet cavity (26) is located on the cylinder head (16) On the side close to the motor (11), the air outlet cavity (27) is located on the side of the cylinder head (16) away from the motor (11).
An air compressor according to claim 12, characterized in that: the ratio of the volume of the inlet cavity (26) to the volume of the outlet cavity (27) is between 1:1.7 and 2.6; or the inlet cavity (26) The ratio of the inner wall area of the) to the inner wall area of the outlet cavity (27) is between 1:1.3 and 2.2.
An air compressor according to claim 10, characterized in that: the end face of the rotor (19) is provided with fan blades (28).
An air compressor according to claim 12, characterized in that the upper surface of the valve plate (15) facing the air inlet cavity (26) and the air outlet cavity (27) is provided with a recess (35).
An air compressor according to claim 10, characterized in that: the upper surface of the valve plate (15) is provided with a valve plate limiting block (36), and the valve plate limiting block (36) is provided with a plurality of heat dissipation slopes (37).
An air compressor according to claim 10, characterized in that: a box (1) is installed at both ends of the motor (11).