Double-layer runner device for heater

Abstract

The utility model relates to a heating device, in particular to a double-layer flow channel device for a heater, which comprises an upper shell, a lower shell, an upper flow channel and a lower flow channel, the lower shell is arranged on the upper shell, the lower shell is provided with a water outlet pipe and a lower cavity communicated with the water outlet pipe, and the lower cavity is further arranged opposite to the upper cavity; wherein the heating plate is arranged between the upper cavity and the lower cavity in a sealed mode, a heating through hole communicated with the upper cavity and the lower cavity is further formed in the heating plate, and liquid sequentially passes through the water inlet pipe, the upper cavity, the heating through hole, the lower cavity and the water outlet pipe. According to the double-layer flow channel device, the heating plate is wrapped in the upper cavity and the lower cavity, the heat source loss of the heating plate is very small, the heat conversion efficiency is higher, double-face heating can be achieved, meanwhile, the liquid flowing path is prolonged, the heat exchange time of liquid is prolonged, and the heat exchange effect is better.

Description

Technical Field

[0001] The utility model relates to a heating device, in particular to a double-flow channel device for a heater. Background Art

[0002] At present, electric heating is the only way to heat electric vehicles. In order to improve the heating comfort, a liquid heater is mostly used to heat air. However, the existing liquid heaters mainly use a heating substrate to heat the liquid in a single flow channel. For example, a liquid heater for automobiles disclosed in CN111536690A. This heating method results in low heating efficiency. In order to ensure reliable heat exchange and heat exchange efficiency, the heating substrate needs to have a large area, which leads to a large overall occupied area of the heater. If the heating power per unit area is increased, it will cause too high local temperature and unstable temperature control. Therefore, it is difficult for the existing structure to meet the requirements of high heating effect and small heating area at the same time. Summary of the Utility Model

[0003] In order to solve the problems of large area and low heat exchange efficiency of the above-mentioned heater, the utility model provides a double-flow channel device for a heater. The specific technical solution is as follows:

[0004] A double-flow channel device for a heater includes: an upper housing provided with a water inlet pipe and an upper cavity communicating with the water inlet pipe; and a lower housing disposed on the upper housing, the lower housing is provided with a water outlet pipe and a lower cavity communicating with the water outlet pipe, and the lower cavity is also disposed opposite to the upper cavity; wherein, a heating plate is hermetically disposed between the upper cavity and the lower cavity, and the heating plate is further provided with heating through holes communicating with the upper cavity and the lower cavity, and the liquid sequentially passes through the water inlet pipe, the upper cavity, the heating through holes, the lower cavity and the water outlet pipe.

[0005] Preferably, the upper housing is further provided with an upper flow structure for making the liquid flow uniformly; the lower housing is further provided with a lower flow structure for making the liquid flow uniformly.

[0006] Further, the upper flow structure includes an upper water tank disposed between the water inlet pipe and the upper cavity and below the upper cavity; the lower flow structure includes a lower water tank disposed between the water outlet pipe and the lower cavity and below the lower cavity; the heating plate is also located between the upper water tank and the lower water tank.

[0007] Among them, the water inlet pipe is arranged on one side of the upper water inlet end of the upper shell. The upper water tank includes an upper water outlet surface far from the water inlet pipe, and the upper water outlet surface is inclined from the water inlet pipe towards the upper cavity. The water outlet pipe is arranged on one side of the lower water outlet end of the lower shell. The lower water tank includes a lower water inlet surface far from the water outlet pipe, and the lower water inlet surface is inclined from the water outlet pipe towards the lower cavity.

[0008] Furthermore, the upper flow structure further includes an upper flow dividing plate, which is arranged between the upper cavity and the upper water tank. A number of upper flow dividing grooves for enabling the liquid to flow evenly and communicating with the upper cavity and the upper water tank respectively are arrayed on the upper flow dividing plate. The lower flow structure further includes a lower flow dividing plate, which is arranged between the lower cavity and the lower water tank. A number of lower flow dividing grooves for enabling the liquid to flow evenly and communicating with the lower cavity and the lower water tank respectively are arrayed on the lower flow dividing plate.

[0009] Among them, the upper flow dividing plate is arranged along the upper water outlet surface; the lower flow dividing plate is arranged along the lower water inlet surface.

[0010] Furthermore, both sides of the upper flow dividing grooves and the lower flow dividing grooves are arc surfaces; an inlet baffle boss is further arranged in the upper water tank.

[0011] Furthermore, the upper flow structure further includes a number of upper guide plates arranged in parallel. The upper guide plates are parallel to the flow direction of the liquid, and both ends of the upper guide plates are respectively located on one side of the upper flow dividing plate and one end of the upper cavity far from the upper flow dividing plate. A number of lower guide plates arranged in parallel are further arranged in the lower cavity. The lower guide plates are parallel to the flow direction of the liquid, and both ends of the lower guide plates are respectively located on one side of the lower flow dividing plate and one end of the lower cavity far from the lower guide plate.

[0012] Furthermore, the lower flow structure further includes a confluence groove, which is arranged between the lower flow dividing plate and the lower water tank.

[0013] Preferably, a number of upper turbulence bars are further arranged in the upper cavity. The upper turbulence bars are arranged crosswise to the flow direction of the liquid in the upper cavity for generating turbulence in the liquid flowing in the upper cavity. A number of lower turbulence bars are further arranged in the lower cavity. The lower turbulence bars are arranged crosswise to the flow direction of the liquid in the lower cavity for generating turbulence in the liquid flowing in the lower cavity.

[0014] Compared with the prior art, the present utility model has the following beneficial effects:

[0015] A double - flow - channel device for a heater provided by the present utility model wraps a heating plate in an upper cavity and a lower cavity. The heat source loss of the heating plate is very small, the heat conversion efficiency is higher, and double - sided heating can be achieved. At the same time, the liquid flow path is extended, the heat exchange time of the liquid is increased, and the heat exchange effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural view of the present application;

[0017] Figure 2 is a schematic structural view of the upper housing;

[0018] Figure 3 is Figure 2 a partial enlarged view at I in

[0019] Figure 4 is a front view of the upper housing;

[0020] Figure 5 is a schematic structural view of the lower housing;

[0021] Figure 6 is a front view of the lower housing;

[0022] Figure 7 is a schematic diagram of the liquid flow. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present utility model will be further described below in conjunction with the accompanying drawings.

[0024] By embedding the heating plate 3 in the water channel for heating, not only can the heat source loss of the heating plate 3 be reduced, the heat conversion efficiency be improved, but also the area of the heating plate 3 can be reduced through double - sided heating, making the area of the heater smaller under the condition of constant heating power.

[0025] Such as Figures 1 to 7As shown in the figure, a double-layer flow channel device for a heater includes an upper housing 5 and a lower housing 6. The upper housing 5 and the lower housing 6 are respectively located on both sides of the heating plate 3, and a sealing ring is installed between the upper housing 5 and the lower housing 6 and the heating plate 3. The heating plate 3 can be a double-sided heating plate 3, capable of heating both sides simultaneously. The upper water inlet end 572 of the upper housing 5 is provided with a water inlet pipe 51, and the water inlet pipe 51 is located on one side of the upper water inlet end 572. The inside of the upper housing 5 is provided with an upper cavity 54, and the upper cavity 54 communicates with the water inlet pipe 51. The upper cavity 54 makes the upper housing 5 in a shell shape. The lower water outlet end 682 of the lower housing 6 is provided with a water outlet pipe 62, and the water outlet pipe 62 is located on one side of the lower water outlet end 682. The inside of the lower housing 6 is provided with a lower cavity 61, and the lower cavity 61 communicates with the water outlet pipe 62. The lower cavity 61 makes the lower housing 6 in a shell shape. The lower housing 6 is installed on the upper housing 5 by screws. The lower cavity 61 is also arranged opposite to the upper cavity 54, and the heating plate 3 is located between the upper cavity 54 and the lower cavity 61. The heating plate 3 is also provided with heating through holes 31 communicating with the upper cavity 54 and the lower cavity 61. The liquid sequentially passes through the water inlet pipe 51, the upper cavity 54, the heating through holes 31, the lower cavity 61 and the water outlet pipe 62.

[0026] The heating plate 3 includes a heating substrate and an electric heating layer. The electric heating layer is arranged on one or two sides of the heating substrate, and the size of the electric heating layer is set according to the heating requirements. The heating plate 3 is an existing mature product and will not be described in detail here.

[0027] Since the heating plate 3 can perform double-sided heating, the area of the heating plate 3 can be reduced under the condition of constant heating power, thereby making the area of the heater smaller. At the same time, since two interconnected flow channels are formed on the upper and lower surfaces of the heating plate 3, the length of liquid flow is increased, thereby increasing the heat exchange time and improving the heat exchange effect, and the liquid can be fully heat exchanged.

[0028] The water inlet pipe 51 and the water outlet pipe 62 are respectively located on both sides of one end of the heater, which can effectively make the liquid fully flow through the upper cavity 54 and the lower cavity 61. Specifically, the water inlet pipe 51 is arranged on one side of the upper water inlet end 572 of the upper housing 5, and the water outlet pipe 62 is arranged on one side of the lower water outlet end 682 of the lower housing 6.

[0029] In order to improve the uniformity of liquid flow and further improve the heat exchange effect, the upper housing 5 is also provided with an upper flow structure for making the liquid flow evenly; the lower housing 6 is also provided with a lower flow structure for making the liquid flow evenly. The upper flow structure and the lower flow structure make the liquid flow more evenly in the upper cavity 54 and the lower cavity 61, thereby ensuring the heat exchange effect, improving the heat exchange efficiency, and at the same time being able to increase the flow rate.

[0030] In some embodiments, the upper flow structure includes an upper water tank 52 located between the water inlet pipe 51 and the upper cavity 54. The water inlet pipe 51 communicates with the upper cavity 54 through the upper water tank 52. The depth of the upper water tank 52 is greater than that of the upper cavity 54, and the upper water tank 52 is located below the upper cavity 54. The water inlet pipe 51 is located at the bottom of the upper water tank 52. The lower flow structure includes a lower water tank 63 located between the water outlet pipe 62 and the lower cavity 61. The water outlet pipe 62 communicates with the lower cavity 61 through the lower water tank 63. The depth of the lower water tank 63 is greater than that of the lower cavity 61, and the lower water tank 63 is located below the lower cavity 61. The water outlet pipe 62 is located at the bottom of the lower water tank 63. Liquid enters the bottom of the upper water tank 52 from the water inlet pipe 51, and then overflows into the upper cavity 54 through the upper water tank 52, thereby improving the uniformity of liquid flow. The upper water tank 52 changes the direction of the high-speed liquid entering from the water inlet pipe 51, preventing the high-speed liquid from directly entering the upper cavity 54. If the liquid entering from the water inlet pipe 51 directly enters the interior of the upper cavity 54, the liquid flow velocity in the area of the upper cavity 54 directly facing the water inlet pipe 51 will be fast, while the liquid flow velocity in the areas on both sides of the water inlet pipe 51 will be slow, affecting the overall heat exchange effect of the liquid, resulting in poor liquid uniformity and causing the local temperature of the heating plate 3 to be too high. Through the upper water tank 52, the uniformity of liquid flow when entering the upper cavity 54 can be improved, and thus the liquid can be uniformly heat-exchanged. Similarly, the lower water tank 63 can also avoid the problem that the liquid flow velocity in the area of the lower cavity 61 directly facing the water outlet pipe 62 is fast while the liquid flow velocity on both sides of the water outlet pipe 62 is slow, improving the uniformity of liquid flow in the lower cavity 61, and further improving the heat exchange effect of the liquid in the lower cavity 61.

[0031] To further improve the effect of the upper water tank 52 and the lower water tank 63 in making the liquid flow uniformly, the sides of the upper water tank 52 and the lower water tank 63 on one side of the upper cavity 54 and the lower cavity 61 are inclined. Specifically, the upper water tank 52 includes upper water inlet surfaces and an upper water outlet surface 522 on both sides. The upper water inlet surface communicates with the water inlet pipe 51, and the upper water outlet surface 522 is located on one side of the upper cavity 54. The upper water outlet surface 522 is inclined from the water inlet pipe 51 towards the upper cavity 54. The inclined upper water outlet surface 522 can gently change the flow direction of the liquid entering from the water inlet pipe 51, guide the liquid entering the upper water tank 52, and enable the liquid to flow in a way of overflowing along the top of the upper water tank 52, thereby improving the uniformity of liquid flow. The lower water tank 63 includes lower water inlet surfaces 631 and a lower water outlet surface on both sides. The lower water outlet surface communicates with the water outlet pipe 62, and the lower water inlet surfaces 631 are located on one side of the lower cavity 61. The lower water inlet surfaces 631 are inclined from the water inlet pipe 51 towards the lower cavity 61. The inclined lower water inlet surfaces 631 can guide the liquid entering the lower water tank 63, prevent the liquid from generating violent turbulence in the lower water tank 63, and enable the liquid entering the lower water tank 63 to flow uniformly towards the water outlet pipe 62, ensuring the uniformity of liquid flow in the lower cavity 61.

[0032] In some embodiments, the upper flow structure further includes an upper flow dividing plate 53, and the lower flow structure further includes a lower flow dividing plate 65. Among them, the upper flow dividing plate 53 is located between the upper cavity 54 and the upper water tank 52. A number of upper flow dividing grooves 531 for making the liquid flow uniformly and communicating with the upper cavity 54 and the upper water tank 52 respectively are arranged in an array on the upper flow dividing plate 53; the liquid in the upper water tank 52 enters the upper cavity 54 through the upper flow dividing grooves 531. The upper flow dividing plate 53 can block the flow of the liquid. The upper flow dividing plate 53 and the upper water tank 52 cooperate to change the flow direction of the liquid entering the upper water tank 52 through the water inlet pipe 51, and enter the upper cavity 54 uniformly through the arrayed upper flow dividing grooves 531, effectively ensuring the uniformity of the liquid in the upper cavity 54. The lower flow dividing plate 65 is arranged between the lower cavity 61 and the lower water tank 63. A number of lower flow dividing grooves 651 for making the liquid flow uniformly and communicating with the lower cavity 61 and the lower water tank 63 respectively are arranged in an array on the lower flow dividing plate 65. The lower flow dividing plate 65 prevents the liquid from directly entering the lower water tank 63 from the lower cavity 61, so that the liquid forms a confluence by entering the lower water tank 63 through the uniformly arranged lower flow dividing grooves 651, and then is discharged through the water outlet pipe 62, thereby ensuring the uniformity of the liquid flow in the lower cavity 61. Further, the upper flow dividing plate 53 is arranged along the upper water outlet surface 522; the lower flow dividing plate 65 is arranged along the lower water inlet surface 631.

[0033] Further, an inlet material blocking boss 521 is also arranged in the upper water tank 52, with a function.

[0034] Further, both sides of the upper flow dividing groove 531 and the lower flow dividing groove 651 are arc surfaces. The arc surfaces can not only avoid forming dead corners, but also reduce the formation of turbulent flow, enabling the liquid to flow uniformly.

[0035] In some embodiments, the upper flow dividing plate 53 can be directly arranged between the upper cavity 54 and the water inlet pipe 51, and the lower flow dividing plate 65 can be directly arranged between the lower cavity 61 and the water outlet pipe 62.

[0036] In some embodiments, the lower flow structure further includes a confluence groove 64. The confluence groove 64 is arranged between the lower flow dividing plate 65 and the lower water tank 63. The confluence groove 64 is located below the lower cavity 61. The depth of the confluence groove 64 is less than the depth of the lower water tank 63. The confluence groove 64 is an arc-shaped groove. The confluence groove 64 is used to converge the liquid passing through the lower flow dividing grooves 651, and overflows into the lower water tank 63 through the confluence groove 64, enabling the liquid to be repeatedly mixed in the confluence groove 64 and improving the temperature uniformity.

[0037] In some embodiments, the upper flow structure further includes a plurality of upper guide plates 56 arranged in parallel, and a plurality of lower guide plates 66 arranged in parallel are further provided in the lower cavity 61; wherein, the upper guide plates 56 are parallel to the flow direction of the liquid, and both ends of the upper guide plates 56 are respectively located on one side of the upper flow dividing plate 53 and one side of the upper water outlet surface 541 of the upper cavity 54. There are gaps between the upper guide plates 56 and the upper flow dividing plate 53 and between the upper guide plates 56 and the upper water outlet surface 541, so that the areas at both ends of the upper guide plates are in a communicating state, avoiding uneven liquid distribution. The upper guide plates 56 divide the upper cavity 54 into multiple parallel independent regions except for the regions at both ends, forming multiple independent flow channels, so that each region does not affect each other, and both ends of each region are in a communicating state, so that the liquid can maintain a uniform flow rate, solving the problem of uniform liquid flow in a large space. The lower guide plates 66 are parallel to the flow direction of the liquid, and both ends of the lower guide plates 66 are respectively located on one side of the lower flow dividing plate 65 and one side of the lower water inlet surface 611 of the lower cavity 61. The function of the lower guide plates 66 is the same as that of the upper guide plates 56, dividing the lower cavity 61 into multiple parallel independent regions except for the regions at both ends, forming multiple independent flow channels, so that each region does not affect each other, and both ends of each region are in a communicating state, so that the liquid can maintain a uniform flow rate, solving the problem of uniform liquid flow in a large space, and further improving the uniformity of liquid flow in the lower cavity 61.

[0038] In some embodiments, in order to improve the heat exchange efficiency of the liquid, a plurality of upper turbulence bars 55 are further provided in the upper cavity 54. The upper turbulence bars 55 are arranged crosswise to the flow direction of the liquid in the upper cavity 54 for generating turbulence in the liquid flowing in the upper cavity 54; a plurality of lower turbulence bars 67 are further provided in the lower cavity 61. The lower turbulence bars 67 are arranged crosswise to the flow direction of the liquid in the lower cavity 61 for generating turbulence in the liquid flowing in the lower cavity 61. The upper turbulence bars 55 and the lower turbulence bars 67 can stir the liquid, so that the liquid can be fully heat exchanged. The upper turbulence bars 55 and the lower turbulence bars are respectively arranged in the regions divided by the upper guide plates 56 and the lower guide plates 66, which can reduce the influence on the uniformity of liquid flow, can independently generate turbulence in their respective regions, and at the same time do not affect the flow rate, and have little influence on the uniformity of liquid flow in the cavity. The upper turbulence bars 55 are perpendicular to the upper guide plates 56 and are arranged in an array along the length direction. The top of the upper turbulence bars 55 and the connection with the upper cavity 54 are both arc-shaped to avoid forming dead corners, and the upper turbulence bars 55 also increase the strength of the upper housing 5. The lower turbulence bars 67 are perpendicular to the lower guide plates 66 and are arranged in an array along the length direction. The top of the lower turbulence bars 67 and the connection with the lower cavity 61 are both arc-shaped to avoid forming dead corners, and the lower turbulence bars 67 also increase the strength of the lower housing 6.

[0039] The liquid enters the upper water trough 52 through the water inlet pipe 51, and then enters the upper cavity 54 evenly through the upper water trough 52 and the upper diverter trough 531, and is divided into multiple flow channels under the action of the upper guide plate 56. The liquid forms turbulence in each flow channel through the upper turbulence strips 55, so that the liquid is fully in contact with the heating plate 3 to achieve sufficient heat exchange. Then the liquid enters the lower cavity 61 through the heating through hole 31, and is divided into multiple flow channels under the action of the lower guide plate 66. The liquid forms turbulence in each flow channel through the lower turbulence strips 67, so that the liquid is fully in contact with the heating plate 3 to achieve sufficient heat exchange. Then the liquid enters the confluence trough 64 through the lower diverter trough 651. After the liquid converges in the confluence trough 64, it enters the lower water trough 63, and finally flows out through the outlet pipe 62.

[0040] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the claims of the present invention.

Claims

1. A double-layer flow channel device for a heater, characterized in that: include: An upper shell (5) is provided with a water inlet pipe (51) and an upper cavity (54) communicating with the water inlet pipe (51); and a lower shell (6) disposed on the upper shell (5); a water outlet pipe (62) and a lower cavity (61) communicating with the water outlet pipe (62) are disposed on the lower shell (6); the lower cavity (61) is also disposed opposite to the upper cavity (54); The heating plate (3) is sealed between the upper cavity (54) and the lower cavity (61), and the heating plate (3) is also provided with a heating through hole (31) communicating with the upper cavity (54) and the lower cavity (61), and the liquid passes through the water inlet pipe (51), the upper cavity (54), the heating through hole (31), the lower cavity (61) and the water outlet pipe (62) in sequence.

2. A double-layer flow channel device for a heater according to claim 1, characterized in that: The upper shell (5) is also provided with an upper flow structure for making the liquid flow evenly; The lower shell (6) is also provided with a lower flow structure for making the liquid flow evenly.

3. A double-layer flow channel device for a heater according to claim 2, characterized in that: The upper flow structure comprises an upper water trough (52), wherein the upper water trough (52) is arranged between the water inlet pipe (51) and the upper cavity (54), and is located below the upper cavity (54); The lower flow structure comprises a lower water trough (63), wherein the lower water trough (63) is arranged between the water outlet pipe (62) and the lower cavity (61), and is located below the lower cavity (61); The upper water tank (52) and the lower water tank (63) are arranged opposite to each other and are located on both sides of the heating plate (3).

4. A double-layer flow channel device for a heater according to claim 3, characterized in that: The water inlet pipe (51) is arranged on one side of the upper water inlet end (572) of the upper shell (5), and the upper water tank (52) comprises an upper water outlet surface (522) away from the water inlet pipe (51), and the upper water outlet surface (522) is arranged to be inclined from the water inlet pipe (51) toward the upper cavity (54); The water outlet pipe (62) is arranged on one side of the lower water outlet end (682) of the lower shell (6), and the lower water tank (63) comprises a lower water inlet surface (631) away from the water outlet pipe (62), and the lower water inlet surface (631) is arranged to be inclined from the water outlet pipe (62) toward the lower cavity (61).

5. A double-layer flow channel device for a heater according to claim 4, characterized in that: The upper flow structure further comprises an upper flow distribution plate (53), the upper flow distribution plate (53) being arranged between the upper cavity (54) and the upper water tank (52), and the upper flow distribution plate (53) being arranged in an array with a plurality of upper flow distribution grooves (531) for making the liquid flow evenly and respectively communicating with the upper cavity (54) and the upper water tank (52); The lower flow structure further comprises a lower flow distribution plate (65), the lower flow distribution plate (65) being arranged between the lower cavity (61) and the lower water tank (63), and a plurality of lower flow distribution grooves (651) for making the liquid flow evenly and respectively communicating with the lower cavity (61) and the lower water tank (63) being arranged in an array on the lower flow distribution plate (65).

6. A double-layer flow channel device for a heater according to claim 5, characterized in that: The upper diverter plate (53) is arranged along the upper water outlet surface (522); The lower diverter plate (65) is arranged along the lower water inlet surface (631).

7. A double-layer flow channel device for a heater according to claim 5, characterized in that: Both sides of the upper flow dividing groove (531) and the lower flow dividing groove (651) are arc surfaces; A water inlet material blocking boss (521) is also provided in the upper water tank (52).

8. A double-layer flow channel device for a heater according to claim 5, characterized in that: The upper flow structure further comprises a plurality of upper flow guide plates (56) arranged in parallel, wherein the upper flow guide plates (56) are parallel to the flow direction of the liquid, and two ends of the upper flow guide plates (56) are respectively located on one side of the upper flow dividing plate (53) and one side of the upper water outlet surface (541) of the upper cavity (54); A plurality of lower guide plates (66) arranged in parallel are further provided in the lower cavity (61); the lower guide plates (66) are parallel to the flow direction of the liquid; and two ends of the lower guide plates (66) are respectively located on one side of the lower diverter plate (65) and one side of the lower water inlet surface (611) of the lower cavity (61).

9. A double-layer flow channel device for a heater according to claim 5, characterized in that: The lower flow structure further comprises a confluence groove (64), wherein the confluence groove (64) is arranged between the lower diverter plate (65) and the lower water groove (63).

10. A double-layer flow channel device for a heater according to claim 1 or 8, characterized in that: A plurality of upper turbulence strips (55) are further provided in the upper cavity (54), wherein the upper turbulence strips (55) are arranged to intersect with the flow direction of the liquid in the upper cavity (54) and are used to generate turbulence in the liquid flowing in the upper cavity (54); A plurality of lower turbulence strips (67) are further provided in the lower cavity (61). The lower turbulence strips (67) are arranged to intersect with the flow direction of the liquid in the lower cavity (61) and are used to generate turbulence in the liquid flowing in the lower cavity (61).

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