阅读说明：本技术 干衣机 (Clothes dryer ) 是由 刘鲁砚 陈贺 毕波 王其建 汪庆波 张新新 于 2021-09-07 设计创作，主要内容包括：本发明提供了一种干衣机,其包括衣物处理腔、其内形成有烘干风道的底座、其内形成有转接风道的前支撑、设于转接风道内的过滤装置；烘干风道内设有加热器及冷凝器,衣物处理腔、烘干风道及转接风道依次相连形成环路风道；过滤装置包括第一过滤盒、第二过滤盒、第三过滤盒、过滤棉；第一过滤盒套装于第二过滤盒内,第二过滤盒的顶部形成有多个长条状的过滤孔且套装于第三过滤盒内,过滤棉套装于第一过滤盒、第二过滤盒、第三过滤盒其中任意一个内；本发明的过滤装置有效提高过滤装置的过滤效果,避免在冷凝器和加热器上附着过多毛屑而导致降低换热效率；另外,不需要为清洗冷凝器和加热器而在底座上专设清洗开口,提高烘干风道的密封性。(The invention provides a clothes dryer, which comprises a clothes treatment cavity, a base, a front support and a filtering device, wherein a drying air channel is formed in the base; a heater and a condenser are arranged in the drying air channel, and the clothes treatment cavity, the drying air channel and the switching air channel are sequentially connected to form a loop air channel; the filtering device comprises a first filtering box, a second filtering box, a third filtering box and filtering cotton; the first filter box is sleeved in the second filter box, a plurality of strip-shaped filter holes are formed in the top of the second filter box and sleeved in the third filter box, and filter cotton is sleeved in any one of the first filter box, the second filter box and the third filter box; the filtering device effectively improves the filtering effect of the filtering device, and avoids the reduction of heat exchange efficiency caused by the adhesion of excessive flock on the condenser and the heater; in addition, a cleaning opening is not required to be specially arranged on the base for cleaning the condenser and the heater, and the sealing performance of the drying air channel is improved.)

1. Laundry dryer, characterized in that it comprises:

a laundry treating chamber;

a base having a drying duct formed therein; a condenser and a heater are arranged in the drying air duct, and the condenser is positioned on the windward side of the heater;

a front support, in which a switching air duct is formed; the clothes processing cavity, the drying air duct and the switching air duct are sequentially connected to form a loop air duct;

the filtering device is arranged in the switching air duct; the filtering device includes:

a first filter cassette;

the second filter box is sleeved outside the first filter box; a filter plate is formed at the top of the second filter box, and a plurality of strip-shaped filter holes are formed in the filter plate;

the third filter box is sleeved outside the second filter box;

the filter cotton is sleeved in any one of the first filter box, the second filter box and the third filter box;

the hot and humid air passing through the clothes processing cavity enters the first filter box through the filter holes, then sequentially passes through the second filter box, the third filter box and the filter cotton, then enters the drying air channel, and enters the clothes processing cavity after sequentially passing through the condenser and the heater.

2. The clothes dryer of claim 1, wherein: the filter cotton is arranged between the second filter box and the third filter box.

3. The clothes dryer according to claim 1 or 2, characterized in that: the distance between two adjacent filtering holes is D, and D belongs to [3, 5], and the unit is as follows: mm.

4. The clothes dryer of claim 3, wherein: the area of the filter plate is marked as S₀The total area of the filter holes on the filter plate is marked as S₁，S₁：S₀∈[0.5，0.7]。

5. The clothes dryer of claim 4, wherein: the filtering holes are in an oblong shape.

6. The clothes dryer of claim 1, wherein: the first filter box comprises a first filter screen, and the mesh number of the first filter screen is N₁(ii) a The second filter box comprises a second filter screen, and the mesh number of the second filter screen is N₂(ii) a The third filter cartridge comprises a third filter screen; the mesh number of the third filter screen is recorded as N₃(ii) a Wherein N is₁≥N₂＞N₃。

7. The clothes dryer according to claim 1 or 2 or 4 or 5 or 6, characterized in that: a support table is formed at the air inlet end of the switching air channel, and a support plate is formed at the top of the third filter box; the supporting plate of the third filter box is arranged on the supporting table, and a sealing strip is arranged between the supporting table and the supporting plate.

8. The clothes dryer of claim 7, wherein: a clamping groove is formed in the top of the second filter box, and a clamping plate is arranged on the edge of the top of the first filter box; the clamping plate of the first filter box is arranged in the clamping groove of the second filter box.

9. The clothes dryer of claim 8, wherein: the second filter box comprises a first filter frame and a second filter frame, and the first filter frame is connected with the second filter frame in the circumferential direction to define an inner cavity of the second filter box.

10. The clothes dryer according to claim 1 or 2, characterized in that: a sink groove is formed on the filter plate; the clothes dryer comprises a drying bracket, wherein the drying bracket comprises a plug pin; the inserting pins are arranged in the sinking groove and supported by the groove bottom of the sinking groove.

Technical Field

The invention belongs to the technical field of clothes dryers, and particularly relates to a clothes dryer.

Background

At present, the heat pump clothes dryer is a very practical household appliance for drying clothes at present, and is suitable for various environments; the temperature of the heat pump clothes dryer is relatively mild, no damage is caused to clothes, and the power consumption is low, so that the heat pump clothes dryer is superior to an electric heating clothes dryer; the heat pump clothes dryer easily generates the fluff of clothes in the air circulation of the drying system, the fluff is easy to flow along with the air flow, if no filtering system exists, the fluff of the clothes dryer enters the two devices of the system along with the air flow through the air duct and is attached to the surfaces of the two devices, and the heat exchange efficiency is influenced as long as time goes; and there is also a risk of swarf adhering to other components, resulting in a reduction in the service life of the machine. At present, many brands' clothes dryers all use open type base, at the base opening of machine bottom, increase the door structure promptly, place two wares near the dead ahead of opening one side and cross the filter pulp to carry out effective filtration to the flock, the user regularly opens the little door of opening part and directly washes filter pulp and two wares. The arrangement needs to be additionally provided with components, and a sealing system is added to ensure the sealing property of the air duct, so that the cost is increased, the poor sealing property is easily caused, the drying efficiency is reduced, the power consumption and the drying time are increased, and the user experience is influenced; in addition, an opening needs to be arranged on the front plate of the clothes dryer corresponding to the opening for avoiding, the influence on the strength of the metal plate is large, and the door body can droop after a long time; secondly, the operation is complex during cleaning, and a user needs to bend down to wash the toilet, so that the inconvenience of the user is increased; and the long-time use of the above arrangement can cause the aging of a sealing system, thus causing air leakage, affecting the drying efficiency and increasing the energy consumption.

The invention is provided in view of the above.

Disclosure of Invention

The present invention provides a clothes dryer aiming at the technical problems.

In order to achieve the purpose, the invention adopts the technical scheme that:

a clothes dryer, comprising:

a laundry treating chamber;

a base having a drying duct formed therein; a condenser and a heater are arranged in the drying air duct, and the condenser is positioned on the windward side of the heater;

a front support, in which a switching air duct is formed; the clothes processing cavity, the drying air duct and the switching air duct are sequentially connected to form a loop air duct;

the filtering device is arranged in the switching air duct; the filtering device includes:

a first filter cassette;

the second filter box is sleeved outside the first filter box; a filter plate is formed at the top of the second filter box, and a plurality of strip-shaped filter holes are formed in the filter plate;

the third filter box is sleeved outside the second filter box;

the filter cotton is sleeved in any one of the first filter box, the second filter box and the third filter box;

the hot and humid air passing through the clothes processing cavity enters the first filter box through the filter holes, then sequentially passes through the second filter box, the third filter box and the filter cotton, then enters the drying air channel, and enters the clothes processing cavity after sequentially passing through the condenser and the heater.

As a practical way, the filter cotton is arranged between the second filter box and the third filter box.

As a practical mode, the distance between two adjacent filtering holes is D, D belongs to [3, 5], and the unit is: mm.

As a practical way, the area of the filter plate is marked S₀The total area of the filter holes on the filter plate is marked as S₁，S₁：S₀∈[0.5，0.7]。

As a practical way, the filtering holes are oblong.

As a practical mode, the first filter box comprises a first filter screen, and the mesh number of the first filter screen is N₁(ii) a The second filter box comprises a second filter screen, and the mesh number of the second filter screen is N₂(ii) a The third filter cartridge comprises a third filter screen; the mesh number of the third filter screen is recorded as N₃(ii) a Wherein N is₁≥N₂＞N₃。

As an implementation mode, a support table is formed at the air inlet end of the switching air channel, and a support plate is formed at the top of the third filter box; the supporting plate of the third filter box is arranged on the supporting table, and a sealing strip is arranged between the supporting table and the supporting plate.

As an implementation mode, a clamping groove is formed at the top of the second filter box, and a clamping plate is arranged at the edge of the top of the first filter box; the clamping plate of the first filter box is arranged in the clamping groove of the second filter box.

As an implementation manner, the second filter box comprises a first filter frame and a second filter frame, and the first filter frame and the second filter frame are connected in the circumferential direction to define an inner cavity of the second filter box.

As a practical mode, the filter plate is provided with a sinking groove; the clothes dryer comprises a drying bracket, wherein the drying bracket comprises a plug pin; the inserting pins are arranged in the sinking groove and supported by the groove bottom of the sinking groove.

Compared with the prior art, the invention has the advantages and positive effects that:

the invention provides a clothes dryer, which comprises a clothes treatment cavity, a base, a front support and a filtering device, wherein a drying air channel is formed in the base; a heater and a condenser positioned on the windward side of the heater are arranged in the drying air channel, and the clothes treatment cavity, the drying air channel and the switching air channel are sequentially connected to form a loop air channel; the filtering device comprises a first filtering box, a second filtering box, a third filtering box and filtering cotton; the first filter box is sleeved in the second filter box, the second filter box is sleeved in the third filter box, and the filter cotton is sleeved in any one of the first filter box, the second filter box and the third filter box; wherein, a filter plate is formed at the top of the second filter box, and a plurality of strip-shaped filter holes are formed on the filter plate; the hot and humid air passing through the clothes treatment cavity enters the first filter box through the filter holes, then enters the drying air channel after passing through the second filter box, the filter cotton and the third filter box in sequence, and is guided into the clothes treatment cavity after passing through the condenser and the heater in sequence; according to the invention, the filter boxes which are sleeved in three layers are arranged, and the filter cotton is clamped between two adjacent filter boxes, so that the filtering effect of the filtering device is effectively improved, thereby effectively removing the flock in the air entering the drying air channel, and avoiding that the heat exchange efficiency is reduced due to the excessive flock attached to the condenser and the heater; in addition, a cleaning opening is not required to be specially arranged on the base for cleaning the condenser and the heater, so that the sealing performance of the drying air channel is improved; moreover, the strip-shaped filtering holes filter out large-size impurities on one hand and prevent the impurities from entering the filtering device; on the other hand helps the flock to enter into the first filter box along with the drying air flow, and prevents the flock from accumulating on the filter plate to cause the filter hole to be blocked, thereby influencing the user experience.

Drawings

FIG. 1 is a schematic structural diagram of a front support, a base, a filtering device and a drying rack of a clothes dryer according to the present invention;

FIG. 2 is a schematic structural view of another perspective of the front support, base, filter and drying rack of the clothes dryer of the present invention;

FIG. 3 is a cross-sectional view of the assembled front support, base and filter assembly of the dryer of the present invention;

FIG. 4 is another cross-sectional view of the assembled front support, base and filter assembly of the dryer of the present invention;

FIG. 5 is an exploded view of the front support, base and filter assembly of the dryer of the present invention;

FIG. 6 is a schematic structural view of a second filter cartridge and a drying rack of the clothes dryer of the present invention;

FIG. 7 is a sectional view of a second filter cartridge and a drying rack of the clothes dryer of the present invention;

FIG. 8 is an exploded view of the filter assembly of the dryer of the present invention;

fig. 9 is a sectional view of a filter unit of the dryer of the present invention;

FIG. 10 is a schematic view showing a structure of a second filter cassette of the clothes dryer of the present invention;

fig. 11 is a structural schematic view of another view angle of the second filter cassette of the clothes dryer of the present invention.

In the above figures: a base 1; a drying air duct 10; a front support 2; a switching duct 20; a support table 21; a filtering device 3; a first filter cassette 4; a first cavity 11; a chucking plate 40; a second filter cassette 5; a filter plate 51; a card slot 52; a third filter cassette 6; a baffle 60; a stopper plate 61; a support plate 62; a first filter frame 91; a second filter frame 92; a support strip 93; a first butt plate 14; a first docking station 15; a second docking plate 16; a second docking station 17; a first clip portion 94; a second clip portion 95; a receptacle 96; a filter cotton 7; a sealing strip 8; a filtration aperture 50; a sink tank 54; drying the bracket 30; a pin 31.

Detailed Description

The present invention is further described below in conjunction with specific examples to enable those skilled in the art to better understand the present invention and to practice it, but the scope of the present invention as claimed is not limited to the scope described in the specific embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

It should be noted that the description relating to "first", "second", etc. in the present invention is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

A clothes dryer, as shown in FIGS. 1 to 11, includes a clothes treating chamber, a base 1, a front support 2, and a filtering device 3. A drying air duct 10 is formed in the base 1, and a condenser and a heater are arranged in the drying air duct 10; a switching air duct 20 is formed in the front support 2; the clothes processing cavity, the switching air duct 20 and the drying air duct 10 are sequentially communicated end to define a loop air duct. Wherein, the air inlet of the switching air duct 20 is communicated with the air outlet of the clothes processing cavity, and the air outlet of the switching air duct 20 is communicated with the air inlet of the drying air duct 10; the air flow passing through the clothes processing chamber enters the switching air duct 20, and then enters the drying air duct 10 through the switching air duct 20, and the heated and dried air formed by sequentially passing through the condenser and the heater arranged in the drying air duct 10 enters the clothes processing chamber, so as to form the cycle drying of clothes.

The filter device 3 is disposed in the switching duct 20 to filter the lint in the air passing through the clothes processing chamber, so as to reduce the lint attached to the condenser and the heater in the drying duct 10. Wherein, a support platform 21 is formed at the air inlet of the switching duct 20.

Specifically, as shown in fig. 5 to 9, the filtering device 3 includes a first filtering cassette 4, a second filtering cassette 5, a third filtering cassette 6 and a filter cotton 7. The first filter box 4 is sleeved in the second filter box 5, and the second filter box 5 is sleeved in the third filter box 6; the cavity of the first filter box 4 is marked as a first cavity 11, the first filter box 4 and the second filter box 5 jointly define a second cavity, and the second filter box 5 and the third filter box 6 jointly define a third cavity. In this embodiment, the filter cotton 7 is sleeved in the third cavity. The top of the second filter box 5 is provided with a filter plate 51, and a plurality of strip-shaped filter holes 50 are formed on the filter plate 51; the air passing through the clothes processing chamber passes through the filtering holes 50 on the filtering plate 51, enters the first chamber 11, then passes through the second chamber and the third chamber in sequence, and then enters the drying air duct 10. It should be noted that the filter cotton 7 can be sleeved in any one of the first filter box 4, the second filter box 5 and the third filter box 6, and the filter cotton 7 is not limited to be sleeved in the third cavity. The filter screen 7 has good air permeability, is not easy to fall flock, and can improve the filtering effect of the filtering device. In this embodiment, the elongated filtering holes 50 are oblong, which is more beneficial for the penetration and sinking of the flock, so as to fully collect the flock in the filtering device 3.

Hereinafter, the present embodiment is to investigate the pitch and size of the filtering holes 50, and the ratio of the total area of the filtering holes 50 to the area of the filtering plates 51 by measuring the mass of the lint accumulated on the filtering plates 51 after the clothes dryer dries the laundry for a certain time. The above conclusion is reached: the distance between two adjacent filtering holes 50 is marked as D, and D belongs to [3, 5]]The unit: mm. In this embodiment, the filtering holes 50 are long, and along the length direction of the filtering holes 50, the distance between two adjacent filtering holes 50 is marked as D_L(ii) a The distance between two adjacent filtering holes 50 along the width direction of the filtering holes 50 is marked as D_W；D_L＞D_W(ii) a As an implementable manner, D_L＝4mm，D_W3.2 mm. In the present embodiment, the length of the elongated filter hole 50 is denoted by L, and the width is denoted by W, L: w is an element of [3, 4 ]]，W∈[4，8]The unit: mm. In addition, the area of the filter plate is denoted as S₀The total area of the filter openings 50 in the filter plate 51 is denoted S₁，S₁：S₀∈[0.5，0.7]. The arrangement of the filtering holes 50 can ensure the filtering function of the filtering plate and prevent large-size impurities from falling into the filtering device; on the other hand, the arrangement of the filter holes 50 is beneficial to the fact that the flocks enter the first filter box along with the drying air flow, and the situation that the flocks are accumulated on the filter plate to cause the blockage of the filter holes 50 and influence the user experience is avoided; while ensuring the overall strength of the filter device 3.

In addition, the filter plate 51 is formed with a sink 54; the clothes dryer comprises a drying bracket 30, wherein the drying bracket 30 comprises a plug pin 31; the plug pins 31 are arranged in the sinking grooves 54 and supported by the groove bottoms of the sinking grooves 54; therefore, the plug pins 31 of the drying bracket 30 are separated from the top of the sinking groove 54, the top of the sinking groove 54 is prevented from touching the drying bracket 30 to cause paint falling, the phenomenon that the drying bracket rusts in humid air after paint falling is avoided, and the service life of the drying bracket is effectively prolonged.

The first filter cassette 4 comprises a first filter screen, the mesh number of which is indicated as N₁(ii) a The second filter cassette 5 includes a second filterThe mesh number of the second filter net is marked as N₂(ii) a The third filter cassette 6 comprises a third filter screen, the mesh number of which is indicated as N₃. Wherein N is₁≥N₂；N₁∈[80，150]，N₂∈[80，150]. In addition, N₂＞N₃；N₃∈[30，100]. Above setting, effectively ensure the filter effect, and reduced the windage of third filter cassette 6. The drying airflow passes through the first filter box 4, the second filter box 5, the filter cotton 7 and the third filter box 6 in sequence, and the flock in the drying airflow is mainly filtered by the first filter box 4 and the second filter box 5. In the embodiment, the flock in the drying airflow after three-layer filtering can be effectively removed, so that the flock attached to the condenser and the heater can be reduced, and the working efficiency of the condenser and the heater can be effectively ensured; excessive flocks are prevented from being attached to the condenser and the heater to reduce the heat exchange efficiency; in addition, a cleaning opening is not required to be specially arranged on the base for cleaning the condenser and the heater, so that the cost is reduced, the integrity and the sealing property of the drying air channel are ensured, the convenience of a user is improved, and the strength of the front plate is ensured; the drying time and the user experience are ensured.

A supporting plate 62 is formed at the outer side of the top of the third filter box 6; the supporting plate 62 of the third filter box 6 is arranged on the supporting table 21, and a sealing strip 8 is arranged between the supporting table 21 and the supporting plate 62; under the action of the gravity of the filtering device 3, the supporting plate 62 presses the sealing strip 8 to effectively seal the connection between the supporting table 21 and the supporting plate 62, so as to ensure that the filtering device 3 is in sealed connection with the front support 2, and the air flow passing through the clothes treatment cavity passes through the filtering device 3. A clamping groove 52 is formed at the top of the second filter box 5, and a clamping plate 40 is arranged at the edge of the top of the first filter box 4; the clamping plate 40 of the first filter cassette 4 is mounted in a clamping groove 52 on the second filter cassette 5 so that the second filter cassette 5 is fixedly connected with the first filter cassette 4. When the filtering device 3 is cleaned, the flock is mainly attached to the first filtering box 4 and the second filtering box 5, and generally, the connected first filtering box 4 and the second filtering box 5 are taken out and cleaned together; and the position of the filtering device 3 is high, so that the filtering device is convenient for a user to take and place, and the convenience for cleaning the user is improved.

A baffle 60 is formed on the inner wall of the third filter box 6, and the filter cotton 7 is arranged in the lower space of the baffle 60 to limit the filter cotton 7. In the embodiment, the filter cotton is made of polyester fiber and hot melt fiber non-woven fabric, and has the advantages of moisture resistance, good air permeability, flexibility, light weight, no toxicity, no odor, low price, recycling and the like.

As shown in fig. 10-11 (the drawings take the second filter cassette as an example), each of the first filter cassette 4, the second filter cassette 5, and the third filter cassette 6 includes a first filter frame 91 and a second filter frame 92, and the bottoms of the first filter frame 91 and the second filter frame 92 are connected to form the bottom of the filter cassette. Be equipped with first joint portion 94 on the first filter frame 91, be equipped with on the second filter frame 92 with the corresponding second joint portion 95 of first joint portion 94, through the joint of first joint portion 94 and second joint portion 95, can make the top of first filter frame 91 and the lock of second filter frame 92, form and have the filter chamber and be boxlike filter cartridge. In this embodiment, the first filter frame 91 and the second filter frame 92 can rotate relatively to realize the opening (for cleaning thread scraps) and the closing (for collecting thread scraps) of the filter box.

Wherein, the edge of the first filter frame 91 is provided with a first butt plate 14 and a first butt table 15 which are arranged in parallel. The edge of the second filter frame 92 is provided with a second butt plate 16 and a second butt table 17 which are arranged in parallel. In this embodiment, the first docking plate 14 is located on a side of the first docking station 15 away from the center of the first filter frame 91.

The first butt plate 14 on the first filter frame 91 is butted with the second butt plate 16 on the second filter frame 92, the second butt table 17 on the second filter frame 92 is butted with the first butt table 15 on the first filter frame 91, and the first clamping portion 94 is matched with the second clamping portion 95, so that the first filter frame 91 and the second filter frame 92 are fixed.

The first filter screen, the second filter screen and the third filter screen are all installed on the corresponding first filter frame 91 and the second filter frame 92.

The first filter frame 91 and the second filter frame 92 are connected through a support strip 93, and the support strip 93 comprises a bending part arranged in the middle area of the support strip 93; the thickness of the bending part is less than that of the supporting bar 93. The thickness of the support bar 93 is marked as D₁And the thickness of the bent part 20 is marked as D₂，D₂＜D₁. In this example, D₂∈[0.08，0.15]The unit: mm. The bending part is thinned, so that the bending part is easy to bend and is not easy to break.

The second filter box 5 is provided with a groove; a limiting plate 61 is arranged at the top of the third filter box 6; the third filter box 6 is sleeved outside the second filter box 5, and the limiting plate 61 on the third filter box 6 is installed in the groove of the second filter box 5 to ensure the relative position of the second filter box 5 and the third filter box 6.

Above, the inner side of the second filter box 5 is provided with a holding part 96 for mounting the aroma; therefore, the dried clothes have fragrance, and user experience is improved.

The moist air passing through the clothes treatment chamber enters the first cavity 11 through the filtering holes 50 on the filtering plate 51, then sequentially passes through the first filtering net, the second cavity, the second filtering net, the filtering cotton 7, the third cavity and the third filtering net, then enters the drying air duct 10, is dried by condensation of the condenser and heating of the heater to form dry hot air, and then enters the clothes treatment chamber, so that circulation is formed to treat clothes.

When the thread scraps in the filter boxes need to be cleaned, the connected first filter box 4 and the second filter box 5 are taken out together, and the first filter frame 91 and the second filter frame 92 of each filter box are rotated, so that the corresponding filter boxes are opened, and the thread scraps in the filter boxes can be cleaned.

The clothes dryer is provided with three layers of sleeved filter boxes, and filter cotton 7 is clamped between the two outermost layers of filter boxes, so that the filtering effect of the filter device 3 is effectively improved, the flock in the air entering the drying air duct 10 is effectively removed, and the phenomenon that the heat exchange efficiency is reduced due to the fact that too much flock is attached to a condenser and a heater is avoided; therefore, the cleanliness of the condenser and the heater is ensured, cleaning openings are not specially arranged on the base, the cost is reduced, the integrity and the tightness of the drying air channel are ensured, the convenience of users is improved, and the strength of the front plate is ensured; the drying time and the user experience are ensured.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.