阅读说明：本技术 一种泵体结构和压缩机 (Pump body structure and compressor ) 是由 马啸昌 史正良 贾波 陈晓晓 郑慧芸 李业林 于 2021-07-09 设计创作，主要内容包括：本公开提供一种泵体结构和压缩机,泵体结构包括气缸和滚子,所述滚子设置于所述气缸中且能在所述气缸中运动以压缩气体,且所述气缸的内周壁上设置有第一凸起和第一凹槽,且在周向方向上所述第一凸起和所述第一凹槽交替连接,以形成第一结构,所述滚子的外周壁上设置有第二凸起和第二凹槽,且在周向方向上所述第二凸起和所述第二凹槽交替连接,以形成第二结构,所述第一凸起能够卡入所述第二凹槽中,所述第二凸起能够卡入所述第一凹槽中；且在所述滚子的运动过程中所述第一结构与所述第二结构相啮合。根据本公开使得气缸和滚子的散热面积得到明显的增大,从而提高了泵体本身的散热效率,使得原有气缸扩容,增大气缸制冷量。(The utility model provides a pump body structure and compressor, pump body structure includes cylinder and roller, the roller set up in the cylinder and can move in the cylinder in order to compress gas, and be provided with first arch and first recess on the internal perisporium of cylinder, and in the circumferential direction the first arch with the first recess is connected alternately to form first structure, be provided with second arch and second recess on the external peripheral wall of roller, and in the circumferential direction the second arch with the second recess is connected alternately to form second structure, the first arch can block in the second recess, the second arch can block in the first recess; and the first structure engages the second structure during movement of the roller. According to the present disclosure, the heat dissipation area of the cylinder and the roller is obviously increased, so that the heat dissipation efficiency of the pump body is improved, the capacity of the original cylinder is expanded, and the refrigerating capacity of the cylinder is increased.)

1. A pump body structure, its characterized in that: the method comprises the following steps:

a cylinder (1) and a roller (2), wherein the roller (2) is arranged in the cylinder (1) and can move in the cylinder (1) to compress gas, a first bulge (11) and a first groove (12) are arranged on the inner peripheral wall of the cylinder (1), the first bulge (11) and the first groove (12) are alternately connected in the circumferential direction to form a first structure, a second bulge (21) and a second groove (22) are arranged on the outer peripheral wall of the roller (2), the second bulge (21) and the second groove (22) are alternately connected in the circumferential direction to form a second structure, and the first structure is meshed with the second structure during the movement of the roller (2); the first projection (11) can be snapped into the second recess (22), and the second projection (21) can be snapped into the first recess (12).

2. The pump body structure according to claim 1, wherein:

the first structure is a first corrugated structure (10), the second structure is a second corrugated structure (20), and the corrugated curve equation of the first corrugated structure in the cross section of the cylinder is

Where rho (t)₁Is the corrugation curve, R, of the first corrugation (10)₁Is the central circular radius, A, of the first corrugation (10)₁Is the sinusoidal amplitude of the first corrugation (10),the phase of the sine curve of the first corrugated structure (10) is shown, t is a rotation angle, and t is 0-2 pi;

in a cross section of the roller, a corrugation curve equation of the second corrugation structure is as follows:

where rho (t)₂Is the corrugation curve, R, of the second corrugation structure (20)₂Is the central radius of the second corrugation, A₂Is the sinusoidal amplitude of the second corrugation (20),the phase of the sine curve of the second ripple structure (20) is t, t is a rotation angle, and t is 0-2 pi.

3. The pump body structure according to claim 2, wherein:

in the cylinderWhereinIs the circumferential radius corresponding to the wave trough of the wave curve of the first wave structure (10) of the cylinder,is the circumferential radius corresponding to the wave crest of the wave curve of the first wave structure (10) of the cylinder.

4. The pump body structure according to claim 2, wherein:

in the rollerWhereinIs the corresponding circumferential radius of the wave trough of the wave curve of the second wave structure (20) of the roller,is the circumferential radius corresponding to the wave curve crest of the second wave structure (20) of the roller.

5. The pump body structure according to any one of claims 2 to 4, wherein:

2A in the corrugation curve equation of the first corrugation (10) of the cylinder₁<The wall thickness H of the cylinder;

2A in the wave curve equation of the second wave structure (20) of the roller₂<The thickness h of the roller wall;

a of the wave curve equation of the first wave structure (10) and the wave curve equation of the second wave structure (20)₁＝A₂；

R in the equation of the corrugation curve of the first corrugation (10) and the equation of the corrugation curve of the second corrugation (20)₂<R₁。

6. The pump body structure according to claim 2, wherein:

of the wave curve equation of the first wave structure (10) and the wave curve equation of the second wave structure (20),andsatisfy the relational expression

7. The pump body structure according to claim 2, wherein:

R₁＝18-22，A₁＝0.2-0.8，

R₂＝12-18，A₂＝0.2-0.8，

8. the pump body structure according to any one of claims 1 to 7, wherein:

the length of the first structure along the axial direction of the cylinder (1) is equal to the axial length of the cylinder (1); the length of the second structure in the axial direction of the roller (2) is equal to the axial length of the roller (2).

9. The pump body structure according to any one of claims 2 to 7, wherein:

the cylinder is subjected to fine machining after being directly cast into a corrugated shape, or the corrugated shape is cut on the inner wall of the cylindrical cylinder of the circular ring by a wire cutting method; and/or the presence of a gas in the gas,

the roller is subjected to fine machining after being directly cast into a corrugated shape, or is subjected to corrugated shape cutting on the outer wall of the cylindrical roller of the circular ring by a wire cutting method.

10. A compressor, characterized by: comprising a pump body structure according to any one of claims 1-9.

Technical Field

The disclosure relates to the technical field of compressors, in particular to a pump body structure and a compressor.

Background

The pump body assembly is a core component for the work of the compressor, is a basic component for realizing the compression function of the compressor, and belongs to the core of the compressor. The refrigerating capacity of the compressor is closely related to the structure of the pump body, and along with the development of the rotary compressor, especially the continuous development of the variable frequency compressor, the limitations of the structure and the material of the traditional compressor begin to appear, and the development of the rotary compressor to higher frequency and energy conservation is hindered to different degrees.

As a pump body moving part, the outer circle of the roller of the existing rotary compressor is in direct contact with the cylinder, so that the friction and heat generation are huge during working, and even if lubricating oil can play a certain role in cooling, the lubricating effect is reduced when the oil temperature is too high, so that how to dissipate heat is important for reducing the temperature of the pump body; meanwhile, in the design process of the compressor, in order to improve the refrigerating capacity, the refrigerating capacity can be improved by increasing the volume of the cylinder, the whole volume of the compressor is required to be changed, and the design is complicated and the compressor is heavy.

The prior art has no obvious improvement on the structure of the compressor, only the design of a heat dissipation device is carried out outside a pump body of the compressor or outside the compressor, the pump body still has low heat dissipation efficiency, and an additional structure needs to be additionally arranged on the basis of original parts of the compressor, so that the volume of the compressor is increased, and the production cost is increased; the pump body with a new structure is designed in a gear meshing mode, so that the heat generation of the pump body is further improved, and the heat dissipation is not facilitated.

Because roller compressor among the prior art produces a large amount of heats because of the friction between roller and the cylinder, but its radiating efficiency is low, and the common structure sets up heat abstractor in the pump body outside, however its radiating efficiency is still lower for compressor system can the bulk temperature higher, and add extra structure in the outside of the compressor pump body and can increase the compressor volume to and technical problem such as increase cost, consequently this disclosure research designs a pump body structure and compressor.

BRIEF SUMMARY OF THE PRESENT DISCLOSURE

Therefore, the technical problem to be solved by the present disclosure is to overcome the defect that the roller compressor in the prior art generates a large amount of heat due to friction between the roller and the cylinder, but the heat dissipation efficiency is low, so as to provide a pump body structure and a compressor.

In order to solve the above problem, the present disclosure provides a pump body structure, which includes:

the cylinder and the roller are arranged in the cylinder and can move in the cylinder to compress gas, a first protrusion and a first groove are arranged on the inner peripheral wall of the cylinder and are alternately connected in the circumferential direction to form a first structure, a second protrusion and a second groove are arranged on the outer peripheral wall of the roller and are alternately connected in the circumferential direction to form a second structure, the first protrusion can be clamped into the second groove, and the second protrusion can be clamped into the first groove; and the first structure engages the second structure during movement of the roller.

In some embodiments, the first structure is a first corrugated structure and the second structure is a second corrugated structure, and the first corrugated structure has a corrugation profile equation of

Where rho (t)₁Is a corrugation curve of the first corrugation structure, R₁Is the central radius of the first corrugation, A₁Is the sinusoidal amplitude of the first corrugation,the phase of the sine curve of the first corrugated structure is shown, t is a rotation angle, and t is 0-2 pi;

in a cross section of the roller, a corrugation curve equation of the second corrugation structure is as follows:

where rho (t)₂Is a corrugation curve of the second corrugation structure, R₂Is the central radius of the second corrugation, A₂Is the sinusoidal amplitude of the second corrugation,and t is the phase of the sine curve of the second corrugated structure, and t is 0-2 pi.

In some embodiments, the cylinder is a cylinderWhereinIs the circumferential radius corresponding to the wave trough of the wave curve of the first wave structure of the cylinder,the radius of the circumference corresponding to the wave crest of the wave curve of the first wave structure of the cylinder.

In some embodiments, the roller is a rollerWhereinIs the circumferential radius corresponding to the wave trough of the wave curve of the second wave structure of the roller,the radius of the circumference corresponding to the wave crest of the wave curve of the second wave structure of the roller.

In some embodiments, 2A in the corrugation curve equation of the first corrugation structure of the cylinder₁<The wall thickness H of the cylinder;

2A in the wave curve equation of the second wave structure of the roller₂<The thickness h of the roller wall;

a in the equation of the corrugation curve of the first corrugation structure and the equation of the corrugation curve of the second corrugation structure₁＝A₂；

R in the equation of the corrugation curve of the first corrugation structure and the equation of the corrugation curve of the second corrugation structure₂<R₁。

In some embodiments, in the equation of the corrugation curve of the first corrugation and the equation of the corrugation curve of the second corrugation,andsatisfies the relation R₁：

In some embodiments, R₁＝18-22，A₁＝0.2-0.8，

R₂＝12-18，A₂＝0.2-0.8，

In some embodiments, a length of the first structure in an axial direction of the cylinder is equal to an axial length of the cylinder; the length of the second structure in the axial direction of the roller is equal to the axial length of the roller.

In some embodiments, the cylinder is subjected to the corrugated shape cutting on the inner wall of the cylinder in the shape of a circular column by a wire cutting method or by a fine machining after the corrugated shape is cast directly; and/or the presence of a gas in the gas,

the roller is subjected to fine machining after being directly cast into a corrugated shape, or is subjected to corrugated shape cutting on the outer wall of the cylindrical roller of the circular ring by a wire cutting method.

The present disclosure also provides a compressor including the pump body structure of any one of the foregoing.

The pump body structure and the compressor provided by the disclosure have the following beneficial effects:

the invention forms a first corrugated structure in the circumferential direction by arranging a first bulge and a first groove which are alternated in the circumferential direction on the inner wall of an air cylinder, simultaneously forms a second corrugated structure in the circumferential direction by arranging a second bulge and a second groove which are alternated in the circumferential direction on the outer circumferential wall of a roller, the first bulge can be clamped into the second groove, the second bulge can be clamped into the first groove, the second bulge on the roller can be meshed with the first bulge of the air cylinder in the movement process of the roller, the corrugated curve of the outer ring of the roller is matched with the corrugated curve of the inner ring of the air cylinder, the inside of the air cylinder is divided into a high pressure area and a low pressure area by a slip sheet, the compression cycle is completed once when the crankshaft drives the roller to rotate for one circle, the heat dissipation areas of the air cylinder and the roller are obviously increased by the structure, thereby improving the heat dissipation efficiency of the pump body, and simultaneously due to the meshing of the corrugated structures, the rolling friction is increased, and the sliding friction between the original roller and the cylinder is reduced, so that the friction and the heating are reduced, the vibration and the noise are reduced, and the service life of the compressor is prolonged; this cylinder and roller complex scheme can be used as and improve the scheme to current cylinder, because the roller trough of this disclosed ripple structure is the excircle size of original roller promptly, consequently this disclosure has effectively increased the area on roller pivoted global, has increased the global area of the inner wall of cylinder equally to make original cylinder dilatation, increase cylinder refrigerating capacity.

Drawings

Fig. 1 is an internal cross-sectional view of a pump body structure of a compressor of the present disclosure;

FIG. 2 is a top view block diagram of the cylinder of FIG. 1 of the present disclosure;

FIG. 3 is an enlarged view of a portion A of FIG. 2;

FIG. 4 is a top view block diagram of the roller of FIG. 1 of the present disclosure;

FIG. 5 is a partial enlarged view of portion B of FIG. 4;

fig. 6 is a top view block diagram of the roller and cylinder combination of the present disclosure.

The reference numerals are represented as:

1. a cylinder; 10. a first corrugated structure; 11. a first protrusion; 12. a first groove; 2. a roller; 20. A second corrugated structure; 21. a second protrusion; 22. a second groove; 3. a lower flange; 4. an upper flange; 5. A crankshaft; 6. a rotor; 7. a stator; 8. a housing.

Detailed Description

As shown in fig. 1-6, the present disclosure provides a pump body structure comprising:

the gas compressor comprises a cylinder 1 and a roller 2, wherein the roller 2 is arranged in the cylinder 1 and can move in the cylinder 1 to compress gas, a first protrusion 11 and a first groove 12 are arranged on the inner peripheral wall of the cylinder 1, the first protrusion 11 and the first groove 12 are alternately connected in the circumferential direction to form a first structure 10, a second protrusion 21 and a second groove 22 are arranged on the outer peripheral wall of the roller 2, the second protrusion 21 and the second groove 22 are alternately connected in the circumferential direction to form a second structure 20, the first protrusion 11 can be clamped into the second groove, and the second protrusion 21 can be clamped into the first groove 12; and the first structure engages the second structure during movement of the roller.

And during the movement of the roller 2 the first structure 10 is matched with the second structure 20, so that the first protrusion 11 is released from the upper second groove 22 and enters the lower second groove 22, and the second protrusion 21 is released from the upper first groove 12 and enters the lower first groove 12.

The invention forms a first structure in the circumferential direction by arranging a first bulge and a first groove which are alternated along the circumferential direction on the inner wall of an air cylinder, simultaneously forms a second structure in the circumferential direction by arranging a second bulge and a second groove which are alternated along the circumferential direction on the outer circumferential wall of a roller, the first bulge can be clamped into the second groove, the second bulge can be clamped into the first groove, the second bulge on the roller can be meshed with the first bulge of the air cylinder in the movement process of the roller, the corrugation curve of the outer ring of the roller is matched with the corrugation curve of the inner ring of the air cylinder, the slide sheet divides the air cylinder into a high pressure area and a low pressure area, the crankshaft finishes one compression cycle every time the roller is driven to rotate for one circle, the heat dissipation areas of the air cylinder and the roller are obviously increased by the structure, thereby improving the heat dissipation efficiency of the pump body, and simultaneously due to the meshing of the corrugation structure, the rolling friction is increased, and the sliding friction between the original roller and the cylinder is reduced, so that the friction and the heating are reduced, the vibration and the noise are reduced, and the service life of the compressor is prolonged; this cylinder and roller complex scheme can be used as and improve the scheme to current cylinder, because the roller trough of this disclosed ripple structure is the excircle size of original roller promptly, consequently this disclosure has effectively increased the area on roller pivoted global, has increased the global area of the inner wall of cylinder equally to make original cylinder dilatation, increase cylinder refrigerating capacity.

The excircle of the roller 2 can be tightly meshed with the inner circle of the cylinder 1, the roller 2 rotates under the driving of the crankshaft 5, the roller can still be tightly meshed with the inner circle of the cylinder in the rotation process, and the air suction and the air exhaust are completed in one rotation. The roller is driven by the crankshaft to translate and rotate in the cylinder, but the excircle of the roller always rotates, so that clamping by the groove and the protrusion can be realized, the clamping can be realized when the amplitude is large, similar gear meshing is realized, and the protrusion in the moving process is continuously clamped in and rotated out of the groove without increasing friction.

The novel compressor structure provided by the disclosure provides a new idea and method for designing the volume and the refrigerating capacity of the compressor. The concave-convex design is carried out on the original circumference, so that the circumference of the circumference is increased, and the volume is increased. Not only the accessible increases the compressor volume and removes the dilatation and design the refrigeration capacity, can carry out the design of novel refrigeration capacity on the basis of original model, reduction design work that can be great. In addition, the contact area of the cylinder and the roller with the corrugated structure is increased, the heat dissipation area is increased, the heat dissipation efficiency can be effectively improved, and the energy loss is reduced.

The utility model provides a novel compressor and compression mechanism that has thereof, including lower flange 3, roller 2, cylinder 1, upper flange 4, bent axle 5, rotor 6, stator 7 that set up in casing 8.

The pump body structure of the compressor is characterized in that the pump body structure mainly comprises a lower flange 3 positioned at the bottommost part of the compressor, a roller 2 and a cylinder 1 which are matched with each other upwards are arranged on the lower flange, a motor consisting of a rotor 6 and a stator 7 drives a crankshaft 5 to rotate, the roller 2 is sleeved on an eccentric circle of the crankshaft, and an upper flange 4 and the lower flange 3 form a closed working cavity.

In some embodiments, the first structure is a first corrugated structure 10 and the second structure is a second corrugated structure 20, and the first corrugated structure 10 has a corrugation profile equation of

Where rho (t)₁Is the corrugation curve, R, of the first corrugation structure 10₁Is the central radius of the first corrugation 10, A₁For the sinusoidal amplitude of the first corrugation 10,the phase of the sine curve of the first ripple structure 10, i.e. how many ripple periods, t is a rotation angle, and t is 0-2 pi;

in a cross section of the roller, a corrugation curve equation of the second corrugation structure is as follows:

where rho (t)₂Is the corrugation curve, R, of the second corrugation structure 20₂Is the central radius of the second corrugation, A₂Being the sinusoidal amplitude of the second corrugation 20,the phase of the sine curve of the second corrugated structure 20, t is a rotation angle, and t is 0-2 pi.

Andthe magnitude of (2) can be arbitrary, and the magnitude of this value affects the number of corrugations in the circumference.Andthe larger the number of the corrugations, the more dense the corrugations, the smaller the number of the corrugations, the more sparse the corrugations, and the corrugation curve is a concave-convex groove formed along the circumference, namely a periodical corrugation curve.

This is the preferred structural style of this first ripple structure and the second ripple structure of disclosure, can effectively guarantee the meshing of mutual stability between two ripple curves, roller excircle ripple can form steady meshing with cylinder inner circle ripple, and whole compression chamber can obtain the dilatation on the basis of original size.

In some embodiments, the cylinder is a cylinderWhereinThe circumferential radius corresponding to the wave trough of the wave curve of the first wave structure 10 of the cylinder,is the circumferential radius corresponding to the wave crest of the wave curve of the first wave structure 10 of the cylinder. This is the preferred structural dimension of the cylinder of the present disclosure, i.e., the peak radius minus the curve amplitude is the center circle radius, and the valley radius plus the curve amplitude is the center circle radius.

In some embodiments, the roller is a rollerWhereinIs the circumferential radius corresponding to the wave trough of said second corrugation 20 of the roller,is the circumferential radius corresponding to the wave crest of said second corrugation 20 of the roller. This is the preferred structural dimension of the roller of the present disclosure, i.e., the peak radius minus the curve amplitude is the center circle radius, and the valley radius plus the curve amplitude is the center circle radius.

In some embodiments, 2A in the corrugation curve equation of the first corrugation structure 10 of the cylinder₁<The wall thickness H of the cylinder;

2A in the wave curve equation of said second wave structure 20 of said roller₂<The thickness h of the roller wall;

a in the equation of the corrugation curve of the first corrugation structure 10 and the equation of the corrugation curve of the second corrugation structure 20₁＝A₂；

R in the equation of the corrugation curve of the first corrugation structure 10 and the equation of the corrugation curve of the second corrugation structure 20₂<R₁。

In order to ensure that the cylinder and the roller can be stably meshed, the amplitude of the inner circle ripple curve of the cylinder and the amplitude of the outer circle ripple curve of the roller must be consistent; the fact that the inner circle of the cylinder is larger than the outer circle of the roller is inevitable, otherwise, the compression volume does not exist, and the compression effect cannot be achieved.

In some embodiments, R of the inner circle of the cylinder and the outer circle of the roller in the corrugation curve equation of the first corrugation structure 10 and the corrugation curve equation of the second corrugation structure 20₁And R₂After the size is determined, the size of the product is determined,andsatisfies the relation R₁：In order to ensure that the cylinder and the roller can be stably meshed, the wave lengths of the inner circle ripple curve of the cylinder and the outer circle ripple curve of the roller are required to be consistent, and the wave lengths are consistent, namely, the period and the phase are consistent.

In some embodiments, R₁＝18-22，A₁＝0.2-0.8，

R₂＝12-18，A₂＝0.2-0.8，

Preferably R₁＝20，A₁＝0.5，Preferably R₂＝15，A₂＝0.5，

In some embodiments, the length of the first corrugated structure 10 in the axial direction of the cylinder 1 is equal to the axial length of the cylinder 1; the length of the second corrugations 20 in the axial direction of the roller 2 is equal to the axial length of the roller 2. This disclosed first ripple structure equals along the axial direction with the axial length of cylinder, can mesh with the second ripple structure on the roller on whole axial length, improves the meshing effect, and increase heat radiating area, and the compression volume and the compression space of increase compressor pump body structure improve the refrigerating output, can also further improve the damping effect.

The cylinder and the roller can be stably meshed in the running process of the compressor, and a complete air suction and exhaust process is formed. The consistency of the amplitude and the wavelength of the curve is ensured in order to ensure stable meshing, the cylinder is motionless, the excircle of the roller rotates along the inner circle of the cylinder and is stably meshed without disengaging all the time, and the excircle of the roller per se is smaller than the inner circle of the cylinder, so that air suction and exhaust can be completed.

In some embodiments, the cylinder is subjected to the corrugated shape cutting on the inner wall of the cylinder in the shape of a circular column by a wire cutting method or by a fine machining after the corrugated shape is cast directly; and/or the presence of a gas in the gas,

the roller is subjected to fine machining after being directly cast into a corrugated shape, or is subjected to corrugated shape cutting on the outer wall of the cylindrical roller of the circular ring by a wire cutting method. This is the preferred machining of the first corrugations on the cylinder and the second corrugations on the roller of the present disclosure, either by casting + finish machining or by wire cutting. The corrugated inner circle of the cylinder is corrugated at the position where the corrugated inner circle passes through the linear cutting, and then a finished product is finely ground by a grinding machine. The inner circle of the roller 2 is a matching surface with the eccentric circle of the crankshaft, and the rough grinding → the fine grinding are carried out. The corrugated shape of the excircle of the roller 2 is roughly processed by linear cutting, and then the excircle is finely ground by a grinder.

The present disclosure also provides a compressor (preferably a roller compressor) comprising a pump body structure according to any one of the preceding claims. The utility model provides a novel compressor and compressing mechanism who has thereof, including setting up pump body structure and the motor in the casing, the pump body mainly has the bent axle, goes up the flange, the cylinder in irregularly shaped compression chamber, irregularly shaped roller, lower flange. The compressor mechanism consists of a working cavity roller, an air cylinder, an upper flange and a lower flange, a motor pushes a crankshaft to drive the roller to rotate at a high speed, the corrugated curve of the outer ring of the roller is matched with the corrugated curve of the inner ring of the air cylinder, the inside of the air cylinder is divided into a high-pressure area and a low-pressure area by a sliding sheet, and one compression cycle is completed when the crankshaft drives the roller to rotate for one circle.

The whole beneficial effects are as follows: a novel compressor pump body structure comprises an air cylinder with an irregular-shaped inner hole and a roller with an irregular-shaped excircle, wherein the irregular shape in the irregular-shaped air cylinder is a corrugated inner hole and a roller excircle in the text; the air cylinder scheme can be used as an improvement scheme for the existing air cylinder, so that the capacity of the original air cylinder is expanded, and the refrigerating capacity of the air cylinder is increased; the original circle is used as the corrugated wave trough, the wave trough is manufactured, the area is increased on the basis of the original circle, and the volume of the air cylinder is increased. Because the roller and the cylinder have the corrugated structure, the effects of vibration reduction and noise reduction can be achieved to a certain extent.

The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present disclosure, and these modifications and variations should also be regarded as the protection scope of the present disclosure.