阅读说明：本技术 贯流风扇蜗壳、贯流风扇以及空调室内机 (Cross-flow fan volute, cross-flow fan and air conditioner indoor unit ) 是由 毛本甲 于 2018-07-20 设计创作，主要内容包括：一种贯流风扇蜗壳、具有该贯流风扇蜗壳的贯流风扇以及具有该贯流风扇的空调室内机,有助于在确保前蜗舌和后蜗舌的相对位置精度和出风口的精度的情况下简化铸造工序。本发明的贯流风扇蜗壳包括设有前蜗舌的第一壁、设有后蜗舌的第二壁以及将所述第一壁和所述第二壁连接的连接壁,第一壁和第二壁沿贯流风扇蜗壳的轴向延伸,第一壁、第二壁和连接壁围成进风口、出风口和从进风口弯曲延伸至出风口的风道,其中,第一壁具有第一部分和第二部分,第一部分包括前蜗舌、构成出风口的出风口构成部以及位于前蜗舌与出风口构成部之间且与后蜗舌相对应的开口,且与第二壁、连接壁通过模具一体形成,第二部分与第一部分拼接并覆盖开口。(A cross-flow fan volute, a cross-flow fan with the cross-flow fan volute and an air conditioner indoor unit with the cross-flow fan are beneficial to simplifying a casting process under the condition that the relative position precision of a front volute tongue and a rear volute tongue and the precision of an air outlet are ensured. The volute of the cross-flow fan comprises a first wall provided with a front volute tongue, a second wall provided with a rear volute tongue and a connecting wall for connecting the first wall and the second wall, wherein the first wall and the second wall extend along the axial direction of the cross-flow fan volute, the first wall, the second wall and the connecting wall enclose an air inlet, an air outlet and an air duct which is bent and extends from the air inlet to the air outlet, the first wall is provided with a first part and a second part, the first part comprises the front volute tongue, an air outlet forming part forming the air outlet and an opening which is positioned between the front volute tongue and the air outlet forming part and corresponds to the rear volute tongue, the first part and the second wall and the connecting wall are integrally formed through a mold, and the second part is spliced with the first part and covers the opening.)

1. A cross-flow fan volute comprising a first wall (10) provided with a front volute tongue, a second wall (20) provided with a rear volute tongue, and a connecting wall (30, 40) connecting the first and second walls, the first and second walls extending in an axial direction (L) of the cross-flow fan volute, the first, second and connecting walls enclosing an air inlet (JF), an air outlet (CF) and an air duct (FD) extending from the air inlet to the air outlet in a curved manner,

the first wall having a first portion (P1) and a second portion (P2),

the first portion (P1) comprises: the front volute tongue; an air outlet forming part (FK) forming the air outlet; and an opening (KK) between the front volute tongue and the air outlet forming part and corresponding to the rear volute tongue, wherein the first part (P1) is integrally formed with the second wall (20) and the connecting walls (30, 40) by a mold,

the second portion (P2) is spliced with the first portion (P1) and covers the opening (KK).

2. The crossflow fan volute of claim 1,

the rear volute tongue is provided with an arc section (22), when viewed along the axial direction, the arc section (22) extends from a starting point (B) to an end point (A) which is closer to the air outlet than the starting point by taking a central point (O) as a circle center,

the opening is formed in a range from an outlet side end point (X) of the front volute tongue to a first position (D) which is a projected position of an extension line of a connecting line of the center point (O) and the end point (A) on the first wall.

3. The crossflow fan volute of claim 2,

the first wall has an arcuate segment that is arcuate when viewed along the axial direction,

the arc-shaped section extends to the first position from the position, closer to the air inlet, of the front volute tongue than the end point (X) on the air outlet side.

4. The crossflow fan volute of claim 3,

the first wall has an air outlet section which is linear when viewed along the axial direction,

the air outlet section extends from the first position (D) to the air outlet.

5. The crossflow fan volute of claim 2,

the second wall (20) having an outlet section (23) which is linear when viewed in the axial direction and extends from the end point (A) to the outlet opening,

the opening is formed in a range from the first position (D) to a second position (J) of the first wall, wherein the second position is a projection position of an extension line of the wind outlet section (23) on the first wall (10).

6. The crossflow fan volute of claim 5,

the first portion (P1) is integrally formed with the second wall (20), the connecting wall (30, 40) using a mold comprising a first mold and a second mold,

the first die is for forming an outer surface of the first portion and an inner surface of the rear volute tongue,

the second die is for forming an outer surface of the second wall and an inner surface of the front volute tongue,

the opening is opposite the rear volute tongue in a direction of draw of the first die relative to the second die.

7. The crossflow fan volute of claim 6,

the opening is formed in a range from the second position (J) to a third position (F),

the third position (F) is a projected position on the first wall of a first parallel line passing the end point (a), the first parallel line being parallel to the drawing direction.

8. The crossflow fan volute of claim 6 or 7,

the opening is formed in a range from the first position (D) to a fourth position (E),

the fourth position (E) is a projected position on the first wall of a second parallel line (IE) passing through an air inlet side end point (I) of the second wall, the second parallel line being parallel to the pattern drawing direction.

9. The crossflow fan volute of claim 2,

the rear volute tongue is provided with an air inlet section (21),

the air inlet section (21) extending from an air inlet side end point (I) of the second wall to the starting point (B),

the air inlet section protrudes towards the centre point (O) when viewed in the axial direction.

10. The crossflow fan volute of claim 1,

the second portion and the opening are connected to each other by at least one of snapping, screwing and bonding.

11. The crossflow fan volute of claim 1,

the periphery of the inner surface of the second part (P2) is provided with a Flange (FB) which is abutted with the periphery of the opening.

12. The crossflow fan volute of claim 1,

the outer surface of the second part (P2) is provided with a reinforcing rib (JQ).

13. A crossflow fan comprising:

the crossflow fan volute of any of claims 1 to 12;

an impeller at least partially housed in the crossflow fan volute; and

a motor for driving the impeller to rotate.

14. An indoor unit of an air conditioner, comprising the cross-flow fan according to claim 13, and being any one of a side-suction bottom-out type indoor unit, a bottom-suction side-out type indoor unit, and a wall-hanging type indoor unit.

Technical Field

The invention relates to a cross-flow fan volute, a cross-flow fan with the same and an air conditioner indoor unit with the same.

Background

In an indoor unit of an air conditioner, a cross-flow fan having advantages such as uniform distribution of airflow at an outlet in an axial direction is often used as an air supply device.

The cross flow fan mainly comprises a volute, an impeller and a motor, wherein the volute can be formed by performing punch forming on a metal sheet or performing casting forming on plastic by using a mold.

However, the volute of the cross-flow fan is complex, that is, the volute of the cross-flow fan includes a first wall provided with a front volute tongue, a second wall provided with a rear volute tongue, and a connecting wall connecting the first wall and the second wall, wherein the first wall and the second wall extend in the axial direction of the volute of the cross-flow fan, the first wall, the second wall, and the connecting wall enclose an air inlet, an air outlet, and an air duct extending from the air inlet to the air outlet in a bending manner, and the accuracy of the relative position of the first wall and the second wall and the accuracy of the shape of the air outlet can significantly affect the performance of the cross-flow fan.

Disclosure of Invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a cross-flow fan volute, a cross-flow fan, and an air conditioning indoor unit, which contribute to simplification of a casting process while ensuring the accuracy of the relative position of a first wall and a second wall and the accuracy of an air outlet.

In order to achieve the above object, the present invention provides a cross-flow fan volute, which includes a first wall provided with a front volute tongue, a second wall provided with a rear volute tongue, and a connecting wall connecting the first wall and the second wall, the first wall and the second wall extending in an axial direction of the cross-flow fan volute, the first wall, the second wall and the connecting wall enclosing an air inlet, an air outlet and an air duct extending from the air inlet to the air outlet in a curved manner, wherein the first wall has a first portion and a second portion, and the first portion includes: the front volute tongue; an air outlet forming part forming the air outlet; and an opening which is positioned between the front volute tongue and the air outlet forming part and corresponds to the rear volute tongue, wherein the first part, the second wall and the connecting wall are integrally formed through a mold, and the second part is spliced with the first part and covers the opening.

Incidentally, the "second portion to be joined to the first portion and cover the opening" is not limited to the case where the second portion covers the opening from the outside of the cross-flow fan scroll, and includes the case where the second portion covers the opening from the inside of the air passage of the cross-flow fan scroll.

According to the cross-flow fan volute, the first part of the first wall, provided with the front volute tongue, is integrally formed with the second wall and the connecting wall, provided with the rear volute tongue, so that compared with the situation that the front volute tongue and the rear volute tongue are formed separately and then assembled, the cross-flow fan volute is beneficial to ensuring the relative position precision of the front volute tongue and the rear volute tongue, and therefore good air outlet performance is ensured; moreover, the first part of the first wall is provided with an air outlet forming part forming an air outlet, namely, the air outlet of the cross-flow fan volute is integrally formed, so that the accuracy of the air outlet is favorably ensured, and the good air outlet performance is ensured; in addition, the first part is provided with an opening corresponding to the rear volute tongue, so that a mould part for forming the inner surface (namely the inner side surface of the air duct) of the rear volute tongue can be conveniently drawn out from the air duct of the formed cross-flow fan volute to the outside through the opening, and the casting process is facilitated to be simplified.

In the cross-flow fan volute according to the present invention, it is preferable that the rear volute tongue has an arc section extending from a start point to an end point closer to the outlet than the start point with a center point as a center point when viewed in the axial direction, and the opening is formed in a range from an outlet-side end point of the front volute tongue to a first position when viewed in the axial direction, the first position being a projection position of an extension line of a connecting line between the center point and the end point on the first wall.

Under the condition that the rear volute tongue of the cross-flow fan volute is provided with the arc section, the mould part for forming the inner surface of the arc section is particularly difficult to take out from the air channel of the formed cross-flow fan volute.

However, according to the cross-flow fan volute of the present invention, the first portion of the first wall has the opening in the range from the air outlet side end point of the front volute tongue to the first position, and therefore, the mold portion for molding the inner surface of the circular arc segment of the rear volute tongue can be easily drawn out from the air duct of the molded cross-flow fan volute to the outside through the opening, which contributes to the simplification of the casting process.

In the cross-flow fan volute of the above-described configuration, it is preferable that the first wall has an arc-shaped section that is arc-shaped when viewed in the axial direction, and the arc-shaped section extends from a position of the front volute tongue closer to the air inlet than the end point on the air outlet side to the first position.

According to the volute of the cross flow fan with the structure, the improvement of the air outlet speed of the cross flow fan is facilitated, and the air outlet noise is reduced.

Further, in the cross-flow fan volute of the above-described configuration, it is preferable that the first wall has a straight air outlet section as viewed in the axial direction, the air outlet section extending from the first position to the air outlet.

According to the volute of the cross flow fan with the structure, the improvement of the air outlet speed of the cross flow fan is facilitated, and the air outlet noise is reduced.

Further, in the cross-flow fan volute of the above-described configuration, it is preferable that the second wall has a straight air outlet section extending from the end point to the air outlet as viewed in the axial direction, and the opening is formed in a range from the first position to a second position of the first wall, where the second position is a projection position of an extension line of the air outlet section on the first wall.

According to the cross-flow fan volute of the above configuration, by limiting the formation position of the opening to the range from the first position to the second position of the first wall, the first portion of the first wall formed integrally with the second wall and the connecting wall can be secured to a large extent, and therefore, the strength of the entire first wall can be secured, the accuracy of the relative position of the first wall and the second wall and the accuracy of the air outlet can be secured, and the performance of the cross-flow fan can be improved (for example, the pressure stability of the cross-flow fan can be secured, the cross-flow fan can be operated smoothly, the air outlet amount of the cross-flow fan can be made uniform, the airflow blown by the cross-flow fan can be made smooth, and the operating sound, abnormal sound, and the like of the cross-flow fan can be reduced or eliminated.

Further, in the cross-flow fan volute of the above-described structure, it is preferable that the first portion and the second wall, and the connecting wall are integrally formed by a mold including a first mold for forming an outer surface of the first portion and an inner surface of the rear volute tongue, and a second mold for forming an outer surface of the second wall and an inner surface of the front volute tongue, and the opening is opposed to the rear volute tongue in a direction in which the first mold is drawn with respect to the second mold.

According to the cross-flow fan volute with the structure, the opening is opposite to the rear volute tongue in the mold drawing direction of the first mold relative to the second mold, so that the first mold for molding the inner surface of the rear volute tongue can be conveniently drawn out from the air channel of the molded cross-flow fan volute to the outside through the opening, and the casting process is facilitated to be simplified.

Further, in the cross-flow fan volute of the above-described structure, it is preferable that the opening is formed in a range from the second position to a third position, the third position being a projected position of a first parallel line passing through the end point on the first wall, the first parallel line being parallel to the draft direction.

According to the cross-flow fan volute of the above configuration, the formation position of the opening is limited to a small range from the second position to the third position of the first wall, and the first portion of the first wall formed integrally with the second wall and the connecting wall can be further enlarged, and therefore, the strength of the entire first wall can be further increased, and the accuracy of the relative position between the first wall and the second wall and the accuracy of the air outlet can be ensured, and the performance of the cross-flow fan can be improved (for example, the pressure stability of the cross-flow fan can be ensured, the cross-flow fan can be smoothly operated, the air outlet amount of the cross-flow fan can be made uniform, the airflow blown by the cross-flow fan can be made smooth, and the operation sound, abnormal sound, and the like of the cross-flow fan can be reduced or eliminated).

Further, in the cross-flow fan volute of the above-described structure, it is preferable that the opening is formed to extend from the first position to a fourth position which is a projected position of a second parallel line passing through the air inlet side end point of the second wall on the first wall, the second parallel line being parallel to the draft direction.

According to the cross-flow fan volute of the above configuration, the formation position of the opening is limited to a small range from the second position to the third position of the first wall, and the first portion of the first wall formed integrally with the second wall and the connecting wall can be further enlarged, and therefore, the strength of the entire first wall can be further increased, and the accuracy of the relative position between the first wall and the second wall and the accuracy of the air outlet can be ensured, and the performance of the cross-flow fan can be improved (for example, the pressure stability of the cross-flow fan can be ensured, the cross-flow fan can be smoothly operated, the air outlet amount of the cross-flow fan can be made uniform, the airflow blown by the cross-flow fan can be made smooth, and the operation sound, abnormal sound, and the like of the cross-flow fan can be reduced or eliminated).

Further, in the cross-flow fan volute of the above-described structure, it is preferable that the rear volute tongue has an air inlet section extending from an air inlet side end point of the second wall to the start point, the air inlet section projecting toward the center point as viewed in the axial direction.

In the cross-flow fan volute, when the air inlet section of the rear volute tongue protrudes towards the central point, the air inlet section of the rear volute tongue can more easily cause that the part of the mold for forming the air channel of the cross-flow fan volute is not easy to take out from the formed air channel of the cross-flow fan volute.

However, according to the cross-flow fan volute with the above structure, the first portion of the first wall has the opening corresponding to the rear volute tongue between the front volute tongue and the air outlet, so that the mold portion for molding the inner surface of the air inlet section of the rear volute tongue can be conveniently drawn out from the air duct of the molded cross-flow fan volute to the outside through the opening, which helps to simplify the casting process.

Further, in the cross-flow fan volute of the present invention, it is preferable that the second portion and the opening are connected to each other by at least one of snap-fitting, screwing, and bonding.

According to the cross-flow fan volute provided by the invention, a complete air channel from the air inlet to the air outlet can be conveniently spliced.

In the cross-flow fan volute according to the present invention, it is preferable that the second portion has a flange on the periphery of the inner surface thereof, the flange abutting against the periphery of the opening.

According to the volute of the cross-flow fan, the reduction of the air outlet speed of the cross-flow fan and the increase of noise caused by the gap generated at the joint of the first part and the second part are avoided.

In addition, in the cross-flow fan volute of the present invention, it is preferable that the outer surface of the second portion is provided with a reinforcing rib.

According to the volute of the cross-flow fan, the deformation of the second part is restrained, so that the reduction of the air outlet speed of the cross-flow fan and the increase of noise caused by the local deformation of the air duct are avoided.

Further, in order to achieve the above object, the present invention provides a cross-flow fan having the above-described cross-flow fan volute; an impeller at least partially housed in the crossflow fan volute; and a motor for driving the impeller to rotate.

In order to achieve the above object, the present invention provides an air conditioning indoor unit including the cross-flow fan, the air conditioning indoor unit being any one of a side-suction bottom-out type indoor unit, a bottom-suction side-out type indoor unit, and a wall-hanging type indoor unit.

(effect of the invention)

According to the present invention, the first portion of the first wall provided with the front volute tongue is integrally formed with the second wall provided with the rear volute tongue and the connecting wall, and therefore, as compared with a case where the front volute tongue and the rear volute tongue are separately molded and then assembled, it is helpful to ensure the relative positional accuracy of the front volute tongue and the rear volute tongue; moreover, the first part of the first wall is provided with an air outlet forming part forming an air outlet, namely, the air outlet of the cross-flow fan volute is integrally formed, so that the accuracy of the air outlet is favorably ensured, and the good air outlet performance is ensured; in addition, the first part of the first wall is provided with an opening corresponding to the rear volute tongue, so that a mould part for molding the inner surface of the rear volute tongue can be conveniently drawn out from the air channel of the molded cross-flow fan volute to the outside through the opening, and the casting process is facilitated to be simplified.

Drawings

Fig. 1 is a side sectional view schematically showing an air conditioning indoor unit according to an embodiment of the present invention.

Fig. 2 is an exploded perspective view showing the structure of a cross flow fan volute according to an embodiment of the present invention.

Fig. 3 is another exploded perspective view illustrating the structure of a cross-flow fan volute according to an embodiment of the present invention from a different angle from that of fig. 2.

Fig. 4 is a side sectional view showing the structure of a cross flow fan volute according to an embodiment of the present invention, and shows a state viewed in the axial direction of the cross flow fan volute (i.e., the direction of the rotation axis of the impeller of the cross flow fan), and the impeller of the cross flow fan is shown in a dotted line for ease of understanding.

Fig. 5 is an explanatory view for explaining an example of the method of manufacturing the cross flow fan scroll according to the embodiment of the present invention.

(symbol description)

1-through-flow fan volute

2 impeller

10 first wall

11 front volute tongue

12 arc segment

13 air outlet section

20 second wall

21 air inlet section

22 arc segment

23 air outlet section

30. 40 connecting wall

JF air inlet

CF air outlet

FD air duct

First part of P1

Second part of P2

FB turned-over edge

JQ reinforcing rib

KK opening

TP projecting piece

FK air outlet forming part

MD1 first die

Second die of MD2

MD3 core

Center point of O

End point of A

Starting point of B

C closest position

D first position

E fourth position

F third position

J second position

G fifth position

I air inlet side end point

Side end point of X air outlet

Detailed Description

An air conditioning indoor unit according to an embodiment of the present invention will be described with reference to fig. 1 to 4, where fig. 1 is a side sectional view schematically showing the air conditioning indoor unit according to the embodiment of the present invention, fig. 2 is an exploded perspective view showing the structure of a cross-flow fan volute according to the embodiment of the present invention, fig. 3 is another exploded perspective view showing the structure of the cross-flow fan volute according to the embodiment of the present invention from a different angle from that of fig. 2, fig. 4 is a side sectional view showing the structure of the cross-flow fan volute according to the embodiment of the present invention, showing a state viewed in the axial direction of the cross-flow fan volute (i.e., the direction of the rotation shaft of the impeller of the cross-flow fan), and the impeller of the cross-flow fan is shown by a broken line for easy understanding.

As shown in fig. 1, the air-conditioning indoor unit of the present embodiment is a side-suction bottom-discharge type indoor unit, that is, the air-conditioning indoor unit has an air suction port on the side and an air outlet port on the lower side. In addition, a cross-flow fan GF having a cross-flow fan scroll 1, an impeller 2 at least partially housed in the cross-flow fan scroll, and a motor (not shown) for rotating the impeller 2 is provided in the air conditioning indoor unit, and a heat exchanger RJ, a drain pan PS, and a strainer LW are provided.

As shown in fig. 2 and 3, the cross-flow fan volute includes a first wall 10 provided with a front volute tongue 11, a second wall 20 provided with a rear volute tongue (including an air inlet section 21 and a circular arc section 22 described below), and connecting walls 30, 40 connecting the first wall 10 and the second wall 20. The first wall 10 and the second wall 20 extend along an axial direction L of the cross flow fan volute, that is, along a rotation axis direction of the impeller 2 of the cross flow fan, and the first wall 10, the second wall 20 and the connecting walls 30 and 40 enclose an air inlet JF, an air outlet CF and an air duct FD extending from the air inlet JF to the air outlet CF in a bending manner.

Further, as shown in fig. 2 and 3, the first wall 10 has a first portion P1 and a second portion P2, wherein the first portion P1 includes: a front volute tongue 11; an outlet constituting portion FK (including an edge of the first wall 10 constituting the outlet CF) constituting the outlet CF; and a slit KK (the slit KK is not limited to the case where the first portion P1 is cut halfway in the direction from the air inlet JF to the air outlet CF) between the front volute tongue 11 and the air outlet constituting part and corresponding to the rear volute tongue, wherein the first portion P1 is integrally formed with the second wall 20 and the connecting walls 30 and 40 by a mold, and the second portion P2 is joined to the first portion P1 to cover the slit KK.

Here, the first portion P1 is integrally formed with the second wall 20 and the connecting walls 30 and 40 using a mold including a first mold for forming the outer surface of the first portion P1 and the inner surface of the rear volute tongue, and a second mold for forming the outer surface of the second wall 20 and the inner surface of the front volute tongue 11, the opening KK being opposite to the rear volute tongue in a drawing direction of the first mold with respect to the second mold (refer to fig. 4).

Further, the second portion P2 of the first wall 10 and the slit KK may be connected to each other by any one or more of snap-fit, screw-connection and adhesion.

Here, the second part P2 of the first wall 10 is interconnected with the opening KK by means of screws not shown. Specifically, as shown in fig. 2, the first wall 10 is provided with projecting pieces TP having screw holes at a plurality of positions on the outer periphery of the second portion P2, the first portion P1 of the first wall 10 is provided with screw holes corresponding to the screw holes of the projecting pieces TP, and the second portion P2 is fixed to the first portion P1 by screwing screws into the screw holes of the second portion P2 and the screw holes of the first portion P1.

As shown in fig. 2, the periphery of the inner surface (i.e., the surface on the air path FD side) of the second portion P2 of the first wall 10 has a flange FB abutting against the periphery of the opening KK.

Further, as shown in fig. 3, the outer surface (i.e., the surface on the opposite side of the air path FD) of the second portion P2 of the first wall 10 is provided with a rib JQ. Specifically, the plurality of ribs JQ are provided so as to extend in the direction orthogonal to the axial direction L, but the present invention is not limited to this.

As shown in fig. 2 and 3, ribs are also provided on the outer surfaces (i.e., the surface on the opposite side of the air path FD) of the first portion P1 of the first wall 10 and the second wall 20. Specifically, a plurality of these ribs are provided so as to extend in a direction orthogonal to the axial direction L, but the present invention is not limited to this.

Here, as shown in fig. 4, the second wall 20 has an air inlet section 21, an arc section 22, and an air outlet section 23 in order from the air inlet JF to the air outlet CF, wherein the air inlet section 21 and the arc section 22 form a rear volute tongue, and the arc section 22 extends from a start point B to an end point a closer to the air outlet CF than the start point B with a center point O as a center when viewed in the axial direction L.

Further, as shown in fig. 4, the first wall 10 has a front volute tongue 11, an arc-shaped section 12 and an air outlet section 13 in sequence in a direction from the air inlet JF to the air outlet CF. Further, when viewed in the axial direction L, the arc-shaped section 12 of the first wall 10, i.e., a portion from the closest position C on the front volute tongue 11 to the first position D is an involute (but not limited thereto), wherein the closest position C is a position on the front volute tongue 11 closest to the impeller 2, and is closer to the air inlet JF than the air outlet side end point X of the front volute tongue 11, and the first position D is a projection position of an extension line of a connecting line of the center point O and the end point a on the first wall 10. Further, the air outlet section 13 of the first wall 10, that is, a portion closer to the outlet CF than the first position D extends linearly from the first position D toward the outlet CF when viewed in the axial direction L (in the illustrated example, the involute of the arc-shaped section 12 is tangent to the first position D, but the involute is not limited thereto). The first wall 10 has a front volute tongue 11 having an inner concave surface facing the duct FD when viewed in the axial direction L.

As shown in fig. 4, the air outlet section 23 of the second wall 20, that is, the portion closer to the air outlet CF than the arc section 22 extends from the end point a to the air outlet CF (in the illustrated example, the end point a is tangent to the arc formed by the arc section 22, but the present invention is not limited thereto). The air inlet section 21 (i.e., the portion closer to the air inlet JF than the circular arc section 22) of the second wall 20 protrudes toward the center point O (in the illustrated example, the portion is in an arc shape connected to the circular arc section 22 at the starting point B, and the tangent line at the starting point B is the same as the tangent line at the starting point B of the circular arc formed by the circular arc section 22, but is not limited thereto).

Here, the opening KK is formed in a range from the outlet side end point X of the front volute tongue 11 to a first position D, preferably in a range from the first position D of the first wall 10 to a second position J, where the second position J is a projection position of an extension line of a straight line formed by the outlet section 23 on the first wall 10. More preferably, the opening KK is formed in a range from a second position J, which is a projected position of a first parallel line passing through the end point a on the first wall 10, the first parallel line being parallel to a drawing direction of the first mold with respect to the second mold (refer to fig. 4), to a third position F, which is a projected position of a second parallel line of the air inlet side end point I of the second wall 20 on the first wall 10, the second parallel line being parallel to a drawing direction of the first mold with respect to the second mold, or in a range from a first position D, which is a projected position of a second parallel line of the end point a on the air inlet side of the second wall 20, to a fourth position E. It is most preferred that the slit KK is formed only from the third position F to the fourth position E (of course, in the case where the rear volute tongue is not provided with the air intake section 21, it is most preferred that the slit KK is formed only from the third position F to a fifth position G which is a projection of a third parallel line passing through the point B on the first wall 10, the third parallel line being parallel to the above-mentioned die drawing direction of the first die with respect to the second die).

Next, an example of a mold for manufacturing a cross flow fan volute according to the present invention will be described with reference to fig. 5.

Here, since the second portion P2 of the first wall 10 has a simple shape and can be manufactured only with a general mold, the mold for manufacturing the portion of the cross flow fan volute of the present invention except for the second portion P2 of the first wall 10 will be mainly described below, and it is assumed here that the slit KK extends from the third position F to the fourth position E.

As a mold for manufacturing a portion of the cross-flow fan volute other than the second portion P2 of the first wall of the present invention, the first die MD1, the second die MD2 and the core MD3 are included, wherein the first die MD1 is used to form an outer surface (a surface on the side opposite to the air passage FD) of a portion of the first wall 10 of the cross-flow fan volute other than the second portion P2 of the cross-flow fan volute, a portion of an outer surface of the connecting walls 30, 40 and an inner surface of the rear volute tongue, the second die MD2 is used to form an outer surface (a surface on the side opposite to the air passage FD) of the second wall 20 of the cross-flow fan volute, a second parallel line (refer to a line connecting the air inlet side end point I and the fourth position E in fig. 5) of the air passage to the air inlet JF and a portion of the connecting walls 30, 40, and the core 3 is used to form a portion of the air passage FD and a fourth parallel line (refer to the fourth end point F in fig. 5) of the air passage a Area of tuyere CF.

When the above mold is used, after the molding of the portion of the cross-flow fan volute except for the second portion P2 of the first wall 10 is completed, the core MD3 is taken out from the air outlet CF of the duct FD after the first die MD1 and the second die MD2 are separated in the die drawing direction.

According to the cross flow fan volute of the invention, the first part P1 of the first wall 10 provided with the front volute tongue 11 is integrally formed with the second wall 20 provided with the rear volute tongue (comprising the air inlet section 21 and the circular arc section 22) and the connecting walls 30 and 40, so that compared with the case that the front volute tongue and the rear volute tongue are separately molded and then assembled, the cross flow fan volute is beneficial to ensuring the relative position precision of the front volute tongue and the rear volute tongue, thereby ensuring good air outlet performance; moreover, the first part P1 has an outlet forming part forming the outlet CF, that is, the outlet CF of the cross flow fan volute is integrally formed, so that the accuracy of the outlet CF is ensured, and good air outlet performance is ensured; in addition, the first part P1 has an opening KK corresponding to the rear volute tongue, so that the mold part for molding the inner surface of the rear volute tongue (i.e. the inner side surface of the air duct) can be conveniently drawn out from the air duct of the molded cross-flow fan volute to the outside through the opening KK, which helps to simplify the casting process.

In addition, according to the volute of the cross flow fan of the present invention, the second portion P2 and the opening KK are connected to each other by a screw connection, so that the complete air path FD from the air inlet JF to the air outlet CF can be easily spliced.

In addition, according to the volute of the cross flow fan of the present invention, the periphery of the surface (i.e., the inner surface) of the second portion P2 on the side of the air duct FD has the turned-over edge FB abutting against the periphery of the opening KK, which helps to avoid the decrease in the air outlet speed and the increase in noise of the cross flow fan due to the gap generated at the connection between the first portion P1 and the second portion P2.

In addition, according to the volute of the cross flow fan of the present invention, the surface (i.e., the outer surface) of the second portion P2 opposite to the air duct FD is provided with the rib JQ, which helps to suppress the deformation of the second portion P2, thereby preventing the reduction of the air outlet speed of the cross flow fan and the increase of noise due to the local deformation of the air duct.

In addition, according to the volute of the cross flow fan of the present invention, the first wall 10 has the arc-shaped segment 12 which is arc-shaped when viewed along the axial direction L, and the arc-shaped segment 12 extends from the closest position C of the front volute tongue 11 (closer to the air inlet JF than the air outlet side end point X of the front volute tongue 11) to the first position D, thereby contributing to increase the air outlet speed of the cross flow fan and reducing the air outlet noise.

Further, according to the volute of the cross-flow fan of the present invention, by limiting the formation position of the opening KK to the range from the first position D to the second position J of the first wall 10, the first portion P1 of the first wall 10 formed integrally with the second wall 20 and the connecting walls 30, 40 can be ensured to be large, and therefore, it is helpful to ensure the strength of the entire first wall 10, thereby ensuring the accuracy of the relative position of the first wall 10 and the second wall 20 and the accuracy of the outlet CF, and improving the performance of the cross-flow fan (for example, ensuring the pressure stability of the cross-flow fan, making the cross-flow fan operate smoothly, making the outlet flow of the cross-flow fan uniform, making the airflow blown by the cross-flow fan smooth, and reducing or eliminating the operating sound, abnormal sound, and the like of the cross-flow fan).

In particular, by limiting the formation position of the opening KK to a small range from the third position F to the fourth position E of the first wall 10, the first portion P1 of the first wall 10 formed integrally with the second wall 20 and the connecting walls 30 and 40 can be increased without affecting the convenience of extracting the mold from the air path FD of the cross-flow fan volute after molding and without increasing the number of molds, and therefore, the strength of the entire first wall 10 can be further increased, and the accuracy of the relative position of the first wall 10 and the second wall 20 and the accuracy of the air outlet CF can be ensured, and the performance of the cross-flow fan can be improved (for example, the pressure stability of the cross-flow fan can be ensured, the cross-flow fan can be smoothly operated, the air flow amount of the cross-flow fan can be made uniform, and the operation sound, abnormal sound, and the like of the cross-flow fan can be reduced or eliminated).

The present invention is described above by way of example with reference to the accompanying drawings, and it is to be understood that the specific implementations of the present invention are not limited to the above-described embodiments.

For example, in the above-described embodiment, the side-suction bottom-discharge type indoor unit has been described for the purpose of illustration, but the present invention is not limited thereto, and the air-conditioning indoor unit may be a bottom-suction side-discharge type indoor unit or a wall-hanging type indoor unit.

In addition, in the above embodiment, the shapes of the front volute tongue 11, the arc-shaped section 12 and the air outlet section 13 of the first wall 10 are not limited to the shapes shown in fig. 4, and similarly, the shapes of the air inlet section 21, the arc-shaped section 22 and the air outlet section 23 of the second wall 20 are not limited to the shapes shown in fig. 4. For example, in the above embodiment, the arc-shaped section 12 of the first wall 10 extends from the closest position C of the front volute tongue 11 to the first position D, but the arc-shaped section 12 may also extend from a position different from the closest position C to the first position D.

In the above embodiment, the periphery of the surface of the second portion P2 on the air passage FD side of the first wall 10 has the burring FB abutting on the periphery of the opening KK, but the burring is not limited to this, and may be omitted in some cases.

In the above embodiment, the rib JQ is provided on the surface of the second portion P2 of the first wall 10 opposite to the air path FD, but the present invention is not limited to this, and the rib may be omitted in some cases.