CN218934672U - Box, box subassembly, air compressor and commercial car - Google Patents

Abstract

The utility model relates to the technical field of air compression, in particular to a box body, a box body assembly, an air compressor and a commercial vehicle. The air compressor comprises a box body, a motor and a crankshaft; the box body is provided with a mounting cavity, wherein the motor and the crankshaft are respectively arranged in the mounting cavity; the motor has a motor shaft, at least one end of which is detachably provided with a crankshaft, wherein a part of the surface of the crankshaft is in contact with a part of the surface of the motor shaft. According to the air compressor provided by the utility model, the motor and the crankshaft are respectively arranged in the box body, and the crankshaft is directly connected with the motor, so that a rear end cover in the prior art is not arranged; compared with the prior art, the box body provided by the utility model at least saves the length of the rear end cover when being practically used for the air compressor, so that the axial length of the air compressor is smaller than that of the vertical air compressor in the prior art, and the space occupied by the air compressor with the box body is smaller.

Description

Box, box subassembly, air compressor and commercial car

Technical Field

The utility model relates to the technical field of air compression, in particular to a box body, a box body assembly, an air compressor and a commercial vehicle.

Background

In the prior art, a patent document with the application number of 201721525161.8 is provided; in the prior art, a vertical air compressor is provided with a crankcase and a motor; the motor shaft is connected with the crankshaft through an elastic coupling; in addition, a rear cover is arranged on the crankcase, and a bearing for installing a coupler is arranged on the rear cover; it can be derived from the above prior art that, due to the arrangement of the elastic coupling and the bearing between the motor shaft and the crankshaft, the axial length of the prior art (the axial direction of the motor shaft of the prior art) at least includes the length of the elastic coupling, thereby resulting in the large volume and high weight of the vertical air compressor of the prior art, and when the vertical air compressor is applied to a commercial vehicle, the vertical air compressor of the prior art occupies more space of the commercial vehicle.

Therefore, how to reduce the volume of the air compressor becomes a technical problem in the prior art.

Disclosure of Invention

In order to solve the technical problem of how to reduce the volume of an air compressor in the prior art, the utility model provides a box body, a box body assembly, the air compressor and a commercial vehicle.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

According to one aspect of the utility model, there is provided a case machined with a mounting cavity for accommodating at least a motor and a crankshaft;

the mounting cavity is in a linear state and penetrates through the box body, and a first mounting opening and a second mounting opening are formed in the surface of the mounting cavity and the surface of the box body;

the direction from the first mounting port to the second mounting port is defined as a first direction, and any cross section of the mounting cavity is respectively circular, wherein the cross section of the mounting cavity is perpendicular to the first direction.

Further, one surface of the box body is provided with a first flaring and a second flaring;

the first flaring and the second flaring are respectively communicated with the mounting cavity;

the first flaring is positioned at the second mounting port, and the second flaring is positioned at the first mounting port.

Further, the box body is provided with an air inlet channel and two radial channels;

the extending direction of the air inlet channel is parallel to the first direction, and one radial channel is respectively arranged at any end of the air inlet channel, wherein the mounting cavity is communicated with the air inlet channel through the two radial channels.

According to one aspect of the present utility model there is provided a tank assembly comprising a tank as hereinbefore described, further comprising a first end cap and a second end cap;

the first end cover covers the first mounting opening, and the second end cover covers the second mounting opening;

the first end cover is provided with an air inlet.

According to one aspect of the present utility model, there is provided an air compressor comprising a casing as described above, further comprising the motor and the crankshaft;

the motor and the crankshaft are respectively arranged in the mounting cavity;

the motor is provided with a motor shaft, at least one end of the motor shaft is detachably provided with the crankshaft, and a part of the surface of the crankshaft is contacted with a part of the surface of the motor shaft.

Further, the crankshaft is provided with a mounting groove;

the groove cavity of the mounting groove and the surface of the crankshaft form a mounting opening, and the motor shaft is inserted into the mounting groove through the mounting opening.

Further, the number of the crankshafts is 2;

and two ends of the motor shaft are respectively and detachably provided with one of the crankshafts.

Further, the device also comprises a box sleeve and a bearing;

the number of the box sleeves and the number of the bearings are 2 respectively, wherein any one of the bearings is sleeved on one of the crankshafts respectively, and any one of the bearings is in interference fit with one of the crankshafts respectively;

The box sleeve is detachably arranged in the mounting cavity, and a mounting seat for mounting the bearing is arranged on the box sleeve;

the bearing is arranged in the mounting seat and in interference fit with the mounting seat, and the bearing is sleeved on the crankshaft positioned at the mounting groove;

the material of case cover includes iron, the material of bearing includes iron.

Further, the motor further comprises a stator and a rotor;

the stator and the rotor are respectively arranged in the mounting cavity, and the stator and the rotor are respectively limited between the two box sleeves;

the stator is detachably connected to the box body;

the motor shaft is detachably connected to the rotor, wherein the motor shaft penetrates through the rotor, and the rotor and the stator form clearance fit.

According to one aspect of the present utility model there is provided a commercial vehicle comprising an air compressor as hereinbefore described.

The technical scheme has the following advantages or beneficial effects:

the motor and the crankshaft are respectively arranged in the box body, and the crankshaft is directly connected with the motor, so that a rear end cover in the prior art is not arranged; in other words, when the box body provided by the utility model is practically used for the air compressor, compared with the prior art, the length of the rear end cover is at least saved, so that the axial length of the air compressor is smaller than that of the vertical air compressor in the prior art, and the space occupied by the air compressor with the box body provided by the utility model is smaller.

Drawings

Fig. 1 is a sectional view of an air compressor according to embodiment 1 of the present utility model;

fig. 2 is a schematic structural diagram of a case provided in embodiment 1 of the present utility model;

fig. 3 is a sectional view of an air compressor according to embodiment 1 of the present utility model;

fig. 4 is a schematic structural diagram of a part of a cylinder head assembly according to embodiment 1 of the present utility model;

fig. 5 is a schematic structural diagram of a part of a cylinder head assembly according to embodiment 1 of the present utility model;

FIG. 6 is an enlarged view of section I of FIG. 3;

fig. 7 is a schematic structural diagram of a secondary air intake valve plate and a valve plate provided in embodiment 1 of the present utility model;

fig. 8 is a schematic structural diagram of an air compressor according to embodiment 1 of the present utility model.

Detailed Description

Example 1:

in the present embodiment, referring to fig. 1, there is provided an air compressor including a casing 1, a motor 2, and a crankshaft 3;

the box body 1 is provided with a mounting cavity 001, wherein the motor 2 and the crankshaft 3 are respectively arranged in the mounting cavity 001;

the motor 2 has a motor shaft 201, and at least one end of the motor shaft 201 is detachably provided with a crankshaft 3, wherein a part of the surface of the crankshaft 3 contacts a part of the surface of the motor shaft 201.

Wherein, the box body is provided with a mounting cavity 001, and the mounting cavity 001 is at least used for accommodating the motor 2 and the crankshaft 3;

The mounting cavity 001 is in a linear state and penetrates through the box body, and a first mounting opening and a second mounting opening are formed in the surfaces of the mounting cavity 001 and the box body; the motor and the crankshaft can be arranged in the installation cavity 001 through the first installation port 002 or the second installation port 003;

the direction from the first mounting port 002 to the second mounting port 003 is defined as a first direction, and any one of the cross sections of the mounting cavities 001 is respectively circular, wherein the cross section of the mounting cavity 001 is perpendicular to the first direction.

In practical application, the box 1 is provided with at least one cylinder head assembly 4; at least one piston-connecting rod assembly 5 is arranged in the box 1. The cylinder head assembly 4 is provided on the case 1, the piston rod assembly 5 is restrained between the case 1 and the cylinder head assembly 4, and the piston rod assembly 5 is connected with the crankshaft 3.

In the prior art (a vertical air compressor, patent document with application number 201721525161.8), a crank case and a motor are detachably connected, so that the motor is positioned outside the crank case; meanwhile, a rear end cover is arranged between the crank case and the motor, the rear end cover is provided with a bearing, and the purpose of the bearing and the rear end cover is to fix the crank shaft and the coupler, so that the maximum length between the crank case and the motor at least comprises the rear end cover or the length of the rear end cover and the length of the coupler, and the axial length of the vertical air compressor in the prior art is longer, so that the volume of the vertical air compressor in the prior art is larger, and the space of a commercial vehicle is occupied more.

In the embodiment, the motor and the crankshaft are respectively arranged in the box body 1, and the crankshaft is directly connected with the motor, so that a rear end cover in the prior art is not arranged; in other words, when the case 1 provided in this embodiment is actually used in an air compressor, compared with the prior art, the length of the rear end cover is at least saved, so that the axial length of the air compressor is smaller than that of the vertical air compressor in the prior art, and the space occupied by the air compressor with the case in this embodiment is smaller.

In the case 1, the motor 2 is directly connected with the crankshaft 3, so as to omit a coupling and a bearing in the prior art (a vertical air compressor, patent document with application number 201721525161.8), thereby achieving the purpose of reducing the axial length of the motor and the crankshaft, further reducing the volume of the air compressor, and occupying a small space of a commercial vehicle.

Therefore, the air compressor provided by the embodiment solves the technical problem of how to reduce the volume of the air compressor.

Specifically, the motor 2 and the crankshaft 3 may be connected in the following ways:

a first mode: a connection for bringing the motor shaft 201 of the motor 2 and the crankshaft 3 into contact with each other in the axial direction of the motor shaft 201; for example: the motor shaft 201 is provided with a threaded blind hole, the direction of the opening of the threaded blind hole is the axial direction of the motor shaft 201, the corresponding crankshaft 3 is provided with a mounting through hole, the direction of the opening of the mounting through hole is the axial direction of the motor shaft 201, the mounting through hole is penetrated through by a bolt and is connected with the threaded blind hole, and the motor 2 and the crankshaft 3 can be directly connected, wherein the end face of the motor shaft 201 and the end face of the crankshaft 3 are in contact with each other.

The second mode is as follows: a connection for bringing the motor shaft 201 of the motor 2 and the crankshaft 3 into contact with each other in the radial direction of the motor shaft 201; for example: a positioning groove and a positioning through hole are processed on the motor shaft 201, the positioning groove penetrates through the motor shaft 201 along the radial direction of the motor shaft 201, and the positioning through hole penetrates through the motor shaft 201 along the radial direction of the motor shaft 201, wherein the perforating direction of the positioning through hole and the penetrating direction of the positioning groove are mutually intersected, so that two opening parts are formed on the groove surfaces of the positioning through hole and the positioning groove; furthermore, the positioning through holes are preferably provided as threaded holes or round through holes or rectangular through holes; correspondingly, a positioning block is processed on the crankshaft 3, the positioning block is positioned at the shaft end part of the crankshaft 3, the shape of the positioning block is matched with that of the positioning groove, and a connecting through hole is processed on the positioning block, and the shape of the connecting through hole is matched with that of the positioning through hole; the positioning block of the crankshaft 3 is arranged in the positioning groove of the motor shaft 201, so that the radial positioning surface of the positioning block (the radial direction of the motor shaft 201) can be contacted with the groove surface of the positioning groove, on the basis, according to the specific arrangement mode of the positioning through hole, a screw or a rectangular positioning pin or a round positioning pin can be inserted into the positioning through hole and the connecting through hole, and the motor 2 can be directly connected with the crankshaft 3.

It should be appreciated that the specific connection of the second embodiment may also be simply transformed to form a similar connection, for example: the position is changed, a positioning block is arranged on the motor shaft 201, a connecting through hole is arranged on the positioning block, and a positioning groove and a positioning through hole are correspondingly arranged on the crankshaft 3; another example is: the direction is changed, a groove-shaped positioning groove is formed in the motor shaft 201, the groove-shaped positioning groove is recessed in the motor shaft 201 along the radial direction of the motor shaft 201 to form two positioning surfaces, correspondingly, a convex positioning block is arranged on the crankshaft 3, and the convex positioning block forms a convex shape when being observed along the axial direction of the crankshaft 3, and the convex positioning block is arranged in the groove-shaped positioning groove; the simple transformation described above to form a similar connection should be considered as one of the second modes of application, the specific connection process and the connection structure formed being the same as the second mode.

In a third mode, the crankshaft 3 is provided with an installation groove; the groove cavity of the mounting groove and the surface of the crankshaft 3 form a mounting opening through which the motor shaft 201 is inserted into the mounting groove.

Wherein, the mounting groove is configured as a blind groove, when the motor shaft 201 is inserted into the mounting groove, the end surface of the motor shaft 201 can be contacted or not contacted with the bottom surface of the mounting groove, and the circumferential surface of the motor shaft 201 and the side surface of the mounting groove can form clearance fit, thus the arrangement is beneficial to reducing the processing cost of the mounting groove and the motor shaft 201; correspondingly, key grooves are respectively machined on the outer surface of the motor shaft 201 and the groove side surface of the mounting groove, key pins are respectively arranged in the key grooves of the motor shaft 201 and the key grooves of the mounting groove, and due to the existence of the key pins, a part of the circumferential surface of the motor shaft 201 is tightly attached to the groove side surface of the mounting groove on the basis of ensuring the coaxiality of the motor shaft 201 and the crankshaft 3; in addition, the key pin is used for ensuring synchronous rotation of the motor shaft 201 and the crankshaft 3 along the circumferential direction during the actual operation of the air compressor; and, in order to avoid the displacement of the motor shaft 201 and the crankshaft 3 along the axial direction of the motor shaft 201, a threaded positioning hole may be provided on the motor shaft 201, and a matching through hole is provided on the crankshaft 3, and a screw is used to penetrate through the matching through hole and connect to the threaded positioning hole, so that the displacement of the motor shaft 201 and the crankshaft 3 along the axial direction of the motor shaft 201 can be avoided.

Or the mounting groove is configured as a blind groove, when the motor shaft 201 is inserted into the mounting groove, the end surface of the motor shaft 201 can be contacted or not contacted with the bottom surface of the mounting groove, the circumferential surface of the motor shaft 201 and the side surface of the mounting groove form interference fit, and the arrangement mode can ensure the coaxiality of the motor shaft 201 and the crankshaft 3; also, key grooves should be formed on the outer surface of the motor shaft 201 and the groove side surfaces of the installation groove, respectively, and it is necessary to guide the connection of the motor shaft 201 and the installation groove using key pins; the arrangement mode can enable the circumferential surface of the motor shaft 201 to be fully contacted with the groove side surface of the mounting groove, and the key pin is used for ensuring synchronous rotation of the motor shaft 201 and the crankshaft 3 along the circumferential direction in the actual operation process of the air compressor; in addition, the motor shaft 201 and the crankshaft 3 can be prevented from being displaced along the circumferential direction by means of a positioning pin or a positioning screw.

It should be appreciated that the specific connection of the third embodiment may also be simply transformed to form a similar connection, for example: the position change is performed by machining an installation groove in the motor shaft 201, machining an insertion portion matching the installation groove in the shaft end portion of the crankshaft 3, and inserting the insertion portion of the crankshaft 3 into the installation groove; another example is: element conversion, wherein an external spline is processed on the motor shaft 201, and correspondingly, an internal spline is processed in a mounting groove of the crankshaft 3, and when the motor shaft 201 is inserted into the mounting groove, the external spline and the internal spline form a meshed state along the circumferential direction; the simple transformation to form a similar connection should be considered as one of the third modes, and the specific connection process and the formed connection structure are the same as those of the third mode.

In this embodiment, the connection between the motor 2 and the crankshaft 3 is preferably implemented in the aforementioned third mode; in the following, the connection between the motor 2 and the crankshaft 3 should follow the third way, unless otherwise indicated.

The air compressor in this embodiment may be a single-stage compressor or a two-stage compressor. It should be understood that in other embodiments, a multi-stage compressor may also be configured, wherein the multi-stage compressor is configured with at least three cylinder head assemblies 4.

Preferably, referring to fig. 1, the air compressor in the present embodiment is a two-stage compressor, i.e., the number of crankshafts 3 is 2; two ends of the motor shaft 201 are respectively detachably provided with one of the crankshafts 3. In the following, the air compressor of the present embodiment should be understood as a two-stage compressor unless specifically noted.

The air compressor in the embodiment can be configured as a vertical air compressor, wherein two cylinder head assemblies 4 are arranged on the box body 1 along the vertical direction; it is also possible to provide a horizontal air compressor in which two cylinder head assemblies 4 are arranged on the tank 1 in the horizontal direction.

In the actual arrangement, referring to fig. 1, either crankshaft 3 is provided with a piston rod assembly 5, respectively; the two piston-connecting rod assemblies 5 are limited at two ends of the motor shaft 201, so that the reciprocating motion masses at the two ends of the motor shaft 201 have the basis of being kept the same or similar; on this basis, it is possible to employ the configuration of the masses of the two piston-connecting rod assemblies 5 to be the same or similar, so that the reciprocating masses at both ends of the motor shaft 201 can be configured to be the same or similar.

Furthermore, in the present embodiment, referring to fig. 1, the number of cylinder head assemblies 4 is preferably set to 2;

either piston rod assembly 5 is respectively restrained between one of the cylinder head assemblies 4 and the housing 1.

It should be understood that in other embodiments, the number of cylinder head assemblies 4 may also be 3 or 4, the number of corresponding piston rod assemblies 5 being the same as the number of cylinder head assemblies 4, wherein at least one crankshaft 3 is provided with two piston rod assemblies 4.

Specifically, in this embodiment, according to the working principle of the two-stage compressor and the exhaust pressure of each cylinder head assembly 4, the cylinder head assembly 4 with relatively low exhaust pressure is a low-pressure cylinder head assembly, and the cylinder head assembly 4 with relatively high exhaust pressure is a high-pressure cylinder head assembly;

one surface of the box body is provided with a first flaring 101 and a second flaring 102;

the first flaring 101 and the second flaring 102 are respectively communicated with the mounting cavity 001;

the first flare 101 is located at the second mounting port 003 and the second flare 102 is located at the first mounting port 002.

Referring to fig. 1 or 2, a first flaring 101 and a second flaring 102 are provided on the case 1, wherein a low pressure cylinder head assembly is provided at the first flaring 101 and covers the first flaring 101, and wherein a high pressure cylinder head assembly is provided at the second flaring 102 and covers the second flaring 102; the piston rod assembly 5, which is confined between the low pressure cylinder head assembly and the case 1, is a low pressure piston rod assembly, wherein a rod portion of the low pressure piston rod assembly may penetrate the first flare 101; the piston rod assembly 5, which is confined between the high pressure cylinder head assembly and the housing 1, is a high pressure piston rod assembly, wherein the rod portion of the high pressure piston rod assembly may penetrate the second flared mouth 102.

The first flaring 101 is positioned at one end of the motor shaft 201, and the second flaring 102 is positioned at the other end of the motor shaft 201; when the low-pressure cylinder head assembly and the high-pressure cylinder head assembly are respectively arranged on the box body 1, a preset interval is reserved between the low-pressure cylinder head assembly and the high-pressure cylinder head assembly.

In the foregoing scenario, there may be a special case where: the motor of the related art is directly provided in the case 1 of the present embodiment, whereby the radial dimension of the air compressor in the radial direction of the motor shaft 201 is relatively large in the foregoing scheme, which is caused by the motor case of the related art being accommodated in the case 1. In order to better reduce the volume of the air compressor, in this embodiment, the motor casing in the prior art is removed, so that the radial size of the air compressor in the foregoing scheme is reduced, and the volume of the air compressor is better reduced. However, after the motor case of the related art is removed, how the aforementioned crankshaft 3 is fixed in the case 1 and how the stator 202, the rotor 203, and the motor shaft 201 of the motor 2 are fixed in the case 1 becomes a new technical problem.

Specifically, referring to fig. 1, the device further comprises a case 6 and a bearing 7;

the number of the box sleeves 6 and the number of the bearings 7 are respectively 2, wherein any one of the bearings 7 is respectively sleeved on one of the crankshafts 3, and any one of the bearings 7 is respectively in interference fit with one of the crankshafts 3;

the box sleeve 6 is detachably arranged in the mounting cavity 001, wherein the box sleeve 6 is provided with a mounting seat for mounting the bearing 7;

the bearing 7 is arranged in the mounting seat, the bearing 7 is in interference fit with the mounting seat, and the bearing 7 is sleeved on the crankshaft 3 positioned at the mounting groove;

the material of the case 6 includes iron, and the material of the bearing 7 includes iron.

The case 6 should be understood as a positioning structure; in the present embodiment, the outer contour of the case 6 is set to the same or similar shape as the inner contour of the case 1, for example: in the radial direction of the motor shaft 201, if the cross section of the inner contour of the case 1 is circular, the cross section of the outer contour of the case 6 is set to be circular.

Preferably, the cross section of the inner contour of the case 1 in the present embodiment is provided in a circular shape (see fig. 2) along the radial direction of the motor shaft 201, and correspondingly, the cross section of the outer contour of the case 6 is provided in a circular shape.

The case 6 is provided with a mounting seat for accommodating one of the bearings 7, wherein an interference fit is formed between the mounting seat and the bearing 7, and one end of the mounting seat is used for blocking the bearing 7. Specifically, the inner cavity of the mounting seat is cylindrical, and along the axial direction of the motor shaft 201, the two axial ends of the mounting seat respectively form a mouth, and any mouth can be penetrated by one end of the motor shaft 201; one of the mouths of the mount has a diameter similar to the diameter of the bearing 7, and the other of the mouths of the mount extends towards the centre of the mount to provide an annular stop which, when axially disposed in the mount, can contact and stop the bearing 7.

The connecting structure of the case cover 6 relative to the case body 1 can adopt an interference fit connecting structure; however, since the air compressor is different in temperature between the working state and the non-working state, an interference fit connection structure may be adopted, the expansion coefficient of the casing 1 is not matched with that of the casing 6, and in the reciprocating motion of the piston connecting rod assembly 5, the casing 1 and the casing 6 are respectively vibrated, so that displacement phenomenon occurs between the casing 6 and the casing 1.

In the present embodiment, it is preferable that the case 6 and the case 1 are connected by a set screw and a set pin; wherein, the box body 1 is provided with a positioning hole and a locking hole, the box sleeve 6 is provided with a threaded hole, and the positioning part is provided with a blind hole shape or a groove shape; the locating pin penetrates through a locating hole in the box body 1, and the locating pin is inserted into the locating part, so that locating is formed between the box sleeve 6 and the box body 1; the set screw is inserted into the locking hole and is connected with the threaded hole of the case 6, so that fixation is formed between the case 6 and the case 1. By adopting the preferable connecting structure, the assembly of the box sleeve 6 and the box body 1 can be facilitated, and the assembly efficiency of the air compressor is improved;

in addition, the above-mentioned preferred connection structure can avoid the occurrence of the phenomenon ' of displacement between the ' case 6 and the case 1 '.

In the present embodiment, it has been mentioned in the foregoing 'third mode', that the crankshaft 3 is provided with a mounting groove, and the motor shaft 201 is directly inserted into the mounting groove, and the bearing 7 in the present embodiment is fitted over the crankshaft 3 at the mounting groove; therefore, on the basis of the aforementioned 'third mode', the crankshaft 3 is connected through the motor shaft 201, the bearing 7 forms interference fit with the case 6 and the crankshaft 3 respectively, and the case 6 and the case 1 are connected through a plurality of positioning screws and positioning pins, so that the motor shaft 201 and the crankshaft 3 are fixed relative to the case 1 respectively.

It should be understood that the aforementioned 'first mode' and 'second mode' can also be implemented by means of the case 6 and the bearing 7, so as to fix the motor shaft 201 and the crankshaft 3 with respect to the case 1, respectively;

the difference between the modes of the 'first mode' and the 'third mode' using the case 6 and the bearing 7, respectively, is that in the 'third mode', the motor shaft 201 is inserted into the mounting groove of the crankshaft 3, so that the motor shaft 201 and the crankshaft 3 form a radial overlap portion in the radial direction; in the 'first mode', however, a radial overlap portion cannot be formed between the motor shaft 201 and the crankshaft 3, so that the crankshaft 3 must be disposed on the motor shaft 201 or on the crankshaft 3 in the 'first mode', which results in one of the motor shaft 201 and the crankshaft 3 forming a suspended shape with respect to the bearing 7, and in order to avoid the suspended shape, it may be necessary to lengthen the axial length of the crankshaft 3 so that the motor shaft 201 and the crankshaft 3 are inserted into the bearing 7, respectively, but such a disposition increases the axial length between the motor shaft 201 and the crankshaft 3 with respect to the 'third mode';

The difference between the manners of the 'second mode' and the 'third mode' using the case 6 and the bearing 7, respectively, is that in the 'third mode', the motor shaft 201 is inserted into the installation groove of the crankshaft 3, and the assembling process of the two is very simple; in the 'second mode', if the motor shaft 201 is connected to the crankshaft 3 first, and then the bearing 7 is disposed at the overlapping portion of the motor shaft 201 and the crankshaft 3, the bearing 7 cannot be actually mounted at the overlapping portion of the motor shaft 201 and the crankshaft 3 due to the blocking of the crankshaft 3 or the motor shaft 201 or other motor 2 components (e.g., the stator 202 or the rotor 203), and in order to avoid this problem, the crankshaft 3 needs to be disposed at a position other than the overlapping portion, which results in the motor shaft 201 or the crankshaft 3 needing to be increased in length, thereby increasing the length between the motor shaft 201 and the crankshaft 3; or, in the 'second mode', if the bearing 7 is connected to the motor shaft 201 first, and then the motor shaft 201 is connected to the crankshaft 3, the crankshaft 3 cannot be inserted into the bearing 7 or is difficult to insert due to the interference connection between the bearing 7 and the motor shaft 201, or the bearing 7 is connected to the crankshaft 3, the bearing 7 and the crankshaft 3 form the interference connection, so that the motor shaft 201 cannot be inserted into the bearing 7 or is difficult to insert, and in order to avoid the problem, the crankshaft 3 needs to be disposed at a position other than the overlapping position, which results in the motor shaft 201 or the crankshaft 3 needing to be increased in length, and thus the length between the motor shaft 201 and the crankshaft 3.

In this embodiment, the material of the casing 6 and the material of the bearing 7 include iron, which is substantially as follows: the expansion coefficient of the case 6 and the expansion coefficient of the bearing 7 are configured to be the same or similar.

In the prior art, the crankcase is usually made of aluminum alloy material, and the bearing is made of steel (the steel contains iron), so that the expansion coefficient of aluminum is quite different from that of the steel;

in the present embodiment, the material of the case 6 and the material of the bearing 7 are set to be the same or similar material (both contain iron), so that the expansion coefficient of the case 6 and the expansion coefficient of the bearing 7 are configured to be the same or have a relatively small difference in coefficients. So as to avoid the creeping phenomenon of the bearing 7 relative to the box sleeve 6 caused by overlarge expansion coefficient difference of the box sleeve 6 and the bearing 7 in the working state of the air compressor; the phenomenon of peristalsis should be understood at least as: a circumferential displacement is generated between the outer race of the bearing 7 and the housing 6.

On the basis of the casing 6 and the bearing 7 described above, the motor 2 also comprises a stator 202 and a rotor 203, see fig. 1;

the stator 202 and the rotor 203 are respectively arranged in the mounting cavity 001, and the stator 202 and the rotor 203 are respectively limited between the two box sleeves 6;

the stator 202 is detachably connected to the case 1;

The motor shaft 201 is detachably connected to the rotor 203, wherein the motor shaft 201 penetrates the rotor 203, and the rotor 203 forms a clearance fit with the stator 202.

Wherein the stator 202 and the rotor 203 are confined between the two casings 6, whereby displacement of the stator 202 and the rotor 203 with respect to the casing 1 is avoided. Preferably, an interference fit is formed between the stator 202 and the case 1, so that heat of the stator 202 can exchange with the atmosphere outside the case 1 through the case 1, thereby improving the heat dissipation efficiency of the motor 2.

The foregoing case 1 is preferably provided with heat dissipation ribs for increasing the surface area of the case 1, so that the heat exchange efficiency between the case 1 and the atmosphere is higher.

Further, the tank body is provided with an air inlet channel 8 and two radial channels 801;

the extending direction of the air intake passage 8 is parallel to the first direction, and one radial passage 801 is provided at either end of the air intake passage 8, respectively, wherein the installation chamber 001 communicates with the air intake passage through the two radial passages 801.

The intake passage 8 is limited to the inside of the case 1, wherein the outline of the intake passage 8 and the outline of the installation cavity 001 are isolated from each other;

the two ends of the air inlet channel 8 are respectively a head end and a tail end, the box body 1 is respectively provided with a radial channel 801 at the head end and the tail end, and the radial channel 801 is respectively communicated with the installation cavity 001 and the air inlet channel 8.

If the air intake mode of the prior art is adopted, air outside the box body 1 is injected into the low-pressure cylinder head assembly, and the temperature of the air compressor is higher than the temperature of the atmosphere in the working state, so that the air which is injected into the box body 1 and is not sucked into the low-pressure cylinder head assembly absorbs the heat of some air compressor to cause the temperature rise of the air compressor; the air temperature increases and will affect the compression efficiency of the air compressor.

Further, the device also comprises a first end cover 004 and a second end cover 005; the box body, the first end cover 004 and the second end cover 005 form a box body assembly, the first end cover 004 covers the first mounting opening 002, and the second end cover 005 covers the second mounting opening 003; the first end cap 004 is provided with an air inlet 006.

In this embodiment, the motor 2 is disposed in the case 1, so that the installation cavity 001 of the case 1 is blocked by the motor 2 to form two chambers, and the two chambers are respectively located at one end of the motor shaft 201; after the case 1 is provided with the air intake passage 8, if external air is injected into the first chamber through the air inlet 006, the air in the first chamber may be sucked into the second chamber through the air intake passage 8, so that the air intake passage 8 increases the length of the 'passage' through which the air is injected into the low pressure cylinder head assembly; meanwhile, in the process that air circulates in the air inlet channel 8, heat exchange is formed between air in the air inlet channel 8 and air outside through the box body 1, so that the temperature of air flowing through the air inlet channel 8 can be reduced, and then air with low temperature is sucked into the low-pressure cylinder head assembly, and the compression efficiency is improved.

Specifically, one of the two radial passages 801 is located on the inner wall of the first chamber, and the other radial passage 801 is located on the inner wall of the second chamber, so that the air located in the first chamber can be sucked into the air intake passage 8 through the radial passage 801 located in the first chamber, and the air in the air intake passage 8 can be discharged into the second chamber through the radial passage 801 located in the second chamber; air in the second chamber is drawn into the low pressure cylinder head assembly.

It should be understood that, in the piston-connecting rod assembly 5 corresponding to the low pressure cylinder head assembly, the piston provided with the air inlet channel and the air inlet valve plate is arranged on the piston, so that during the movement of the piston from the top dead center to the bottom dead center relative to the low pressure cylinder head assembly, negative pressure is generated in the compression cavity of the low pressure cylinder head assembly, the negative pressure enables the air inlet valve plate to be opened relative to the air inlet channel 8, and air in the second cavity is sucked into the compression cavity of the low pressure cylinder head assembly.

Further, in the prior art (a vertical air compressor, patent document with application number 201721525161.8), an intercooler and an air intake pipe are provided, the purpose of which is to guide low-pressure compressed air to the intercooler for cooling through the air intake pipe, and return the cooled compressed air through other pipelines or channels; however, due to the arrangement of the intercooler and the air inlet pipe, the volume of the vertical air compressor is obviously increased.

In this embodiment, in order to reduce the volume of the air compressor better, a preferred solution is provided in this embodiment.

Specifically, referring to fig. 3 to 5, a low pressure cylinder head assembly and a high pressure cylinder head assembly are provided on the case 1;

the compression chamber of the low pressure cylinder head assembly is defined as a first compression chamber and the compression chamber of the high pressure cylinder head assembly is defined as a second compression chamber, the first compression chamber and the second compression chamber being in communication through an air guide channel 9, wherein the air guide channel 9 is confined inside the combination of the low pressure cylinder head assembly, the high pressure cylinder head assembly and the tank 1.

The first purpose of the air guide channel 9 is: and guiding the primary compressed air generated by the first compression cavity of the low-pressure cylinder head assembly into the second compression cavity of the high-pressure cylinder head assembly.

The second purpose of the air guide channel 9 is: in the process of guiding the primary compressed air, the air guide channel 9 becomes a cooling channel of the primary compressed air; wherein, the in-process of one-level compressed air at the air duct 9 of flowing through, one-level compressed air forms the heat exchange through low pressure cylinder body subassembly, box 1 and high pressure cylinder head subassembly respectively, with the outside air that is located air compressor to reached the purpose of cooling one-level compressed air, and then improved the compression efficiency of high pressure cylinder head subassembly.

The air guide channel 9 is disposed inside the low-pressure cylinder head assembly, the box 1 and the high-pressure cylinder head assembly, and compared with the prior art (a vertical air compressor, patent document with application number 201721525161.8), at least the volumes of the intercooler and the air inlet pipe are saved, so that the volume of the air compressor of the embodiment is significantly smaller than that of the vertical air compressor of the prior art.

Specifically, referring to fig. 3 to 5, the air guide passage 9 includes a first passage 901, a second passage 902, a third passage 903, and at least two air guide holes 904;

the first channel 901 is arranged in the low pressure cylinder head assembly, wherein the contour of the first channel 901 and the contour of the first compression cavity are isolated from each other;

a second passage 902 is provided within the high pressure cylinder head assembly, wherein the profile of the second passage 902 is isolated from the profile of the second compression chamber;

the third channel 903 is arranged in the box body 1, all the air guide holes 904 are respectively arranged on the box body 1, wherein the outline of the third channel 903 is mutually isolated from the outline of the installation cavity 001, the outline of any one air guide hole 904 is mutually isolated from the outline of the installation cavity 001, any one air guide hole 904 is respectively communicated with the third channel 903, the first channel 901 is communicated with the third channel 903 through at least one air guide hole 904, and the second channel 902 is communicated with the third channel 903 through at least one air guide hole 904;

The first passage 901 serves, in addition to discharging the primary compressed air to the first compression chamber, to be penetrated by a bolt of the low pressure cylinder head assembly, which is coupled to the case 1 such that the low pressure cylinder head assembly is fixed with respect to the cylinder, wherein when the first passage 901 accommodates the bolt, an air guide gap is formed between an inner surface of the first passage 901 and the bolt, and the air guide gap communicates with the second passage 902.

The third channel 903 has the same structure as the first channel 901, uses similar to those described above, and uses thereof are different from each other: the primary compressed air in the second passage 902 is directed into the second compression chamber, and the remainder will not be described in detail herein.

The specific configuration of the first passage 901 and the third passage 903 is dependent on the specific configuration of the low pressure cylinder head assembly and the high pressure cylinder head assembly thereof.

If the low pressure cylinder head assembly comprises a cylinder cover, a valve plate and a cylinder body, and the valve plate and the cylinder body are of a split structure, the first channel 901 should penetrate through the valve plate and the cylinder body respectively, and the first channel 901 is covered by the cylinder cover; if the low pressure cylinder head assembly comprises a cylinder head and an integrated cylinder body, wherein the integrated cylinder body is machined with a valve plate, the first channel 901 should penetrate the cylinder body and the first channel 901 is covered by the cylinder head.

Referring to fig. 6, when the bolt can penetrate the installation through hole of the cylinder head, a first sealing gasket B is provided between the bolt and the outer surface of the cylinder head for preventing air outside the cylinder head assembly 4 from entering the inside of the cylinder head assembly 4 through a gap between the installation through hole and the bolt; a second sealing washer C is arranged between the bolt and the wall of the mounting through hole on the cylinder cover for preventing the compressed air from overflowing to the outside of the cylinder head assembly 4.

The specific structure of the high-pressure cylinder head assembly is the same as or similar to the specific structure of the first channel 901, and will not be described again here.

Referring to fig. 3, the air guide channel 9 further includes a primary exhaust chamber 905 and a primary intake chamber 906;

the primary exhaust chamber 905 is disposed within the low pressure cylinder head assembly, wherein the contour of the primary exhaust chamber 905 is isolated from the contour of the first compression chamber, the primary exhaust chamber 905 being in communication with the first passage 901;

a primary air intake chamber 906 is disposed within the high pressure cylinder head assembly, wherein the contour of the primary air intake chamber 906 is isolated from the contour of the second compression chamber, the primary air intake chamber 906 communicating with the second passage 902;

wherein, referring to fig. 1 or 3, the primary exhaust chamber 905 is confined between the head and valve plate of the low pressure cylinder head assembly; the valve plate is provided with a first-stage exhaust channel, a first-stage exhaust valve plate E is covered at the first-stage exhaust channel D, and when the first-stage compressed air is discharged out of the first compression cavity, the pressure of the first-stage compressed air forces the first-stage exhaust valve plate E to deform, so that the first-stage compressed air is injected into the first-stage exhaust cavity 905; since the first passage 901 communicates with the primary exhaust chamber 905, primary compressed air located in the primary exhaust chamber 905 is circulated into the second passage 902 through the first passage 901.

Referring to fig. 1 or 3 or 7, the primary intake chamber 906 is defined between the head and valve plate of the high pressure head assembly; the valve plate is provided with a secondary air inlet channel G and a secondary air outlet channel, wherein the secondary air inlet channel G is communicated with the primary air inlet cavity 906, and the secondary air outlet channel is mutually isolated from the primary air inlet cavity 906; the secondary air inlet channel G and the secondary air outlet channel are respectively covered with a secondary air inlet valve plate F and a secondary air outlet valve plate; the pressure of the primary compressed air forces the secondary air inlet valve plate F to be opened, so that the primary compressed air is sucked into the second compression cavity; the primary compressed air is compressed in the second compression chamber and is converted into secondary compressed air, and the pressure of the secondary compressed air forces the secondary exhaust valve plate to open, so that the secondary compressed air is discharged from the secondary compression chamber.

It should be understood that the high pressure cylinder head assembly is further provided with a secondary exhaust chamber and an exhaust port, and the secondary compressed gas discharged from the secondary compression chamber is injected into the secondary exhaust chamber and then discharged to the outside of the air compressor through the exhaust port.

Referring to fig. 3 or 4, the air guide passage 9 further includes a first direction-changing passage 907 and a second direction-changing passage 908;

one surface of the low-pressure cylinder head assembly is a first-stage mounting surface, a first-stage opening is formed at the intersection of the first channel 901 and the first-stage mounting surface, a first diversion channel 907 is positioned at the first-stage opening, the first diversion channel 907 is communicated with the first channel 901 along the radial direction of the first-stage compression cavity, and the first diversion channel 907 is communicated with at least one air guide hole 904 along the axial direction of the first-stage compression cavity;

One of the surfaces of the high-pressure cylinder head assembly is a secondary mounting surface, a secondary opening is formed at the intersection of the second channel 902 and the secondary mounting surface, the second direction-changing channel 908 is positioned at the secondary opening, the second direction-changing channel 908 is communicated with the second channel 902 along the radial direction of the secondary compression cavity, and the second direction-changing channel 908 is communicated with at least one air guide hole 904 along the axial direction of the secondary compression cavity.

In the connection structure of the low pressure cylinder head assembly and the case 1, if the bolt is connected to the case 1 by penetrating one of the air guide holes 904 directly after the bolt penetrates the first passage 901, since the gap between the bolt and the air guide hole 904 is relatively small, the gap affects the flow rate of the primary compressed air, thereby creating a new problem. The connection structure and existing problems of the high-pressure cylinder head assembly and the case 1 are similar, and are not repeated here.

If the bolts to be accommodated in the first passages 901 and the bolts to be accommodated in the second passages 902 penetrate the gas-guide holes 904 on the case 1, respectively, the connection of the bolts to the case 1 will be provided deep in the case 1, which results in the case 1 requiring an increase in thickness in order to provide screw holes corresponding to the bolts, thereby increasing the volume of the case 1.

In this embodiment, referring to fig. 2, a screw hole a for a connection bolt is provided at the surface of the case 1, specifically, the screw hole a is recessed toward the second passage 902 along the surface of the case 1, and the screw hole a may be provided as a through hole or a blind hole.

Referring to fig. 2 or 3, the screw holes a are juxtaposed with the previously described air holes 904 such that after the bolts are connected to the screw holes a, one of the air holes 904 communicates with the first passage 901 through the first redirecting passage 907, and the other air hole 904 communicates with the second passage 902 through the second redirecting passage 908.

The specific shapes of the first redirecting passage 907 and the second redirecting passage 908 are not limited in this embodiment as long as the first redirecting passage 907 communicates with the first passage 901 and the first redirecting passage 907 communicates with one of the gas holes 904, and as long as the second redirecting passage 908 communicates with the second passage 902 and the second redirecting passage 908 communicates with one of the gas holes 904.

Further, referring to fig. 1, a cooling device is provided on the case 1;

the cooling device at least comprises a cooling fan 01, wherein the cooling fan 01 is positioned between the low-pressure cylinder head assembly and the high-pressure cylinder head assembly, the cooling fan 01 is provided with a positive pressure end and a negative pressure end, the positive pressure end faces the high-pressure cylinder head assembly, and the negative pressure end faces the low-pressure cylinder head assembly.

The cooling device is used for pressurizing air outside the air compressor, so that the high-pressure cylinder head assembly positioned at the positive pressure end of the cooling fan 01 forms heat exchange with the air with positive pressure, and the low-pressure cylinder head assembly positioned at the negative pressure end of the cooling fan 01 forms heat exchange with the air with rich pressure.

Preferably, referring to fig. 8, the cooling device further includes a guide cover 02, and the guide cover 02 covers the first cylinder head assembly 4, the second cylinder head assembly 4, and the cooling fan 01 in a radial direction of the cooling fan 01.

The air guide sleeve 02 can limit the flow direction of the air leaving the cooling fan 01, so that the air pressurized by the cooling fan 01 can only flow along the axial direction of the cooling fan 01, but not flow along the radial direction of the cooling fan 01, and further the heat exchange efficiency of the high-pressure cylinder head assembly and the low-pressure cylinder head assembly is improved.

Example 2:

in this embodiment, a commercial vehicle is provided that includes an air compressor as in the foregoing embodiment 1.

The specific structure and technical effects of the air compressor in this embodiment are the same as those of the air compressor in the foregoing embodiment 1, and are not repeated here.

The commercial vehicles in this embodiment include, but are not limited to: trucks and buses; commercial vehicles include from the perspective of the power source: fuel oil commercial vehicles, pure commercial vehicles, oil-electricity hybrid commercial vehicles, hydrogen energy commercial vehicles and the like.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the present utility model and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present utility model.

Claims (10)

1. The box body is characterized in that a mounting cavity is formed in the box body and is at least used for accommodating a motor and a crankshaft;

the mounting cavity is in a linear state and penetrates through the box body, and a first mounting opening and a second mounting opening are formed in the surface of the mounting cavity and the surface of the box body;

the direction from the first mounting port to the second mounting port is defined as a first direction, and any cross section of the mounting cavity is respectively circular, wherein the cross section of the mounting cavity is perpendicular to the first direction.

2. The case according to claim 1, wherein one face of the case is provided with a first flare and a second flare;

the first flaring and the second flaring are respectively communicated with the mounting cavity;

the first flaring is positioned at the second mounting port, and the second flaring is positioned at the first mounting port.

3. The tank according to claim 2, characterized in that it is provided with an air intake channel and two radial channels;

the extending direction of the air inlet channel is parallel to the first direction, and one radial channel is respectively arranged at any end of the air inlet channel, wherein the mounting cavity is communicated with the air inlet channel through the two radial channels.

4. A tank assembly comprising the tank of any one of claims 1 to 3, further comprising a first end cap and a second end cap;

the first end cover covers the first mounting opening, and the second end cover covers the second mounting opening;

the first end cover is provided with an air inlet.

5. An air compressor comprising the housing of claim 1, further comprising the motor and the crankshaft;

the motor and the crankshaft are respectively arranged in the mounting cavity;

the motor is provided with a motor shaft, at least one end of the motor shaft is detachably provided with the crankshaft, and a part of the surface of the crankshaft is contacted with a part of the surface of the motor shaft.

6. The air compressor of claim 5, wherein the crankshaft is provided with a mounting groove;

The groove cavity of the mounting groove and the surface of the crankshaft form a mounting opening, and the motor shaft is inserted into the mounting groove through the mounting opening.

7. The air compressor of claim 6, wherein the number of crankshafts is 2;

and two ends of the motor shaft are respectively and detachably provided with one of the crankshafts.

8. The air compressor of claim 7, further comprising a casing and a bearing;

the number of the box sleeves and the number of the bearings are 2 respectively, wherein any one of the bearings is sleeved on one of the crankshafts respectively, and any one of the bearings is in interference fit with one of the crankshafts respectively;

the box sleeve is detachably arranged in the mounting cavity, and a mounting seat for mounting the bearing is arranged on the box sleeve;

the bearing is arranged in the mounting seat and in interference fit with the mounting seat, and the bearing is sleeved on the crankshaft positioned at the mounting groove;

the material of case cover includes iron, the material of bearing includes iron.

9. The air compressor of claim 8, wherein the motor further comprises a stator and a rotor;

The stator and the rotor are respectively arranged in the mounting cavity, and the stator and the rotor are respectively limited between the two box sleeves;

the stator is detachably connected to the box body;

the motor shaft is detachably connected to the rotor, wherein the motor shaft penetrates through the rotor, and the rotor and the stator form clearance fit.

10. Commercial vehicle, characterized in that it comprises an air compressor according to claim 5.

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