Constant-volume mixing tank

Abstract

The utility model relates to the technical field of beverage preparation, in particular to a constant-volume mixing tank. The constant-volume mixing tank comprises a tank body, the stirring assembly comprises a plurality of stirring blade assemblies, the plurality of stirring blade assemblies are rotatably arranged in the tank body, and the stirring blade assemblies are provided with a plurality of stirring blades; the cleaning assembly comprises a stirring blade cleaning structure and a cleaning pipeline, the stirring blade cleaning structure is provided with multiple first cleaning balls, the multiple first cleaning balls communicate with the cleaning pipeline, the multiple first cleaning balls correspond to the multiple stirring blade assemblies in a one-to-one mode, and the first cleaning balls are arranged on one sides of the stirring blade assemblies and located at the bottoms of the stirring blade assemblies; the surface of the first cleaning ball is provided with a plurality of water spraying holes, and the water spraying directions of the water spraying holes face the stirring blade bottom and the stirring blade root. And water spraying holes are formed in the surface of the first cleaning ball, cleaning liquid can be sprayed out from the water spraying holes to wash the bottoms and the roots of the stirring blades, residues are washed away, and the risk of beverage pollution is avoided.

Description

Technical Field

[0001] This utility model relates to the field of beverage preparation technology, specifically to a constant volume mixing tank. Background Technology

[0002] When producing bean-based, grain-based, and nut-based beverages, a constant-volume mixing tank is required. Various materials are added to the tank in a specific ratio through the inlet. The stirring device is then activated, causing the materials to undergo intense shearing, stirring, and mixing under the action of the stirring blades, achieving a uniform mixture. After a period of use, the constant-volume mixing tank requires cleaning. The tank is equipped with cleaning balls that spray cleaning solution into the tank. Cleaning is completed after a period of continuous rinsing. However, the cleaning balls only reach the inner wall of the tank and the upper surface of the stirring blades. Other areas of the stirring blades, due to their angle, cannot be cleaned, and residues can lead to microbial growth, posing a risk of beverage contamination. Utility Model Content

[0003] In view of this, the present invention provides a constant volume mixing tank to solve the problem of the risk of contaminating beverages.

[0004] This utility model provides a constant volume mixing tank, comprising:

[0005] Tank body;

[0006] A stirring assembly, comprising multiple stirring blade assemblies, the multiple stirring blade assemblies being rotatably disposed within the tank, each stirring blade assembly having multiple stirring blades;

[0007] A cleaning assembly includes a stirring blade cleaning structure and a cleaning pipeline. The stirring blade cleaning structure has multiple first cleaning balls, each of which is connected to the cleaning pipeline. Each of the multiple first cleaning balls corresponds to a multiple stirring blade assembly. The first cleaning balls are disposed on one side of the stirring blade assembly and located at the bottom of the stirring blade assembly. The surface of the first cleaning ball has a plurality of water spray holes, and the water spray direction of the plurality of water spray holes is towards the bottom of the stirring blade and the root of the stirring blade.

[0008] In one optional embodiment, the cleaning structure further includes a tank cleaning structure having at least one second cleaning ball disposed inside the tank. The surface of the second cleaning ball has a plurality of water spray holes, and the second cleaning ball is connected to the cleaning pipeline.

[0009] In one optional embodiment, the tank is connected to an overflow pipe, and the cleaning assembly further includes a third cleaning ball disposed inside the overflow pipe, the third cleaning ball being connected to the cleaning pipeline.

[0010] In one optional embodiment, the cleaning pipeline includes a first pipeline, a second pipeline, and a third pipeline. The two ends of the first pipeline are respectively connected to the second cleaning ball and the cleaning fluid delivery pipeline. One end of the second pipeline is connected to the first pipeline, and the other end of the second pipeline is respectively connected to a plurality of the first cleaning balls. One end of the third pipeline is connected to the first pipeline, and the other end of the third pipeline is connected to the third cleaning ball.

[0011] In one optional embodiment, the stirring assembly further includes a rotating shaft and a drive structure. The rotating shaft is rotatably disposed within the tank body. The rotating shaft is parallel to or coaxial with the central axis of the tank body. A first end of the rotating shaft extends out of the tank body and is connected to the drive structure. A plurality of stirring blade assemblies are spaced apart on the rotating shaft along its axial direction. The root of each stirring blade is fixedly connected to the rotating shaft. The plurality of stirring blades in each stirring blade assembly are spaced apart along the circumferential surface of the rotating shaft.

[0012] In one optional embodiment, the stirring blades are obliquely arranged on the rotating shaft, the stirring blades are at an angle of 35° to the horizontal plane, and the angle between adjacent stirring blades in each stirring blade assembly is 109°.

[0013] In one alternative embodiment, the agitators of adjacent agitator assemblies are staggered, with the angle between the upper agitator and the lower adjacent agitator being 49°.

[0014] In one alternative embodiment, the bottom of the tank has multiple support legs, and the support legs are equipped with a weighing structure.

[0015] In one optional embodiment, the discharge port of the tank is provided with an anti-vortex plate.

[0016] In one optional embodiment, control valves are respectively provided on the second pipeline and the third pipeline, and the control valves can control the opening degree of the second pipeline and the third pipeline.

[0017] Beneficial effects:

[0018] 1. By setting a first cleaning ball below the stirring blade assembly, and the surface of the first cleaning ball is provided with several water spray holes, the cleaning liquid can be sprayed out from the water spray holes to rinse the bottom and root of the stirring blade, thereby cleaning the residual material at the bottom and root of the stirring blade and avoiding the risk of contaminating the beverage.

[0019] 2. By installing a first cleaning ball and a second cleaning ball inside the tank, and a third cleaning ball inside the overflow pipe, the tank can be thoroughly cleaned to prevent material residue inside the tank and avoid the risk of contaminating the beverage.

[0020] 3. By setting the angle between the stirring blade and the horizontal plane to 35°, the angle between adjacent stirring blades in each stirring blade assembly to 109°, and the angle between the uppermost stirring blade and the adjacent lowermost stirring blade to 49°, the material in the tank can be fully mixed axially and radially during the stirring process. While ensuring the stirring effect, it avoids excessive radial force that could cause the tank to shake, which helps to reduce the impact on weighing and improve weighing accuracy.

[0021] 4. By installing an anti-vortex plate at the discharge port, the anti-vortex plate can effectively reduce the generation of air bubbles in the material and prevent the discharge pump from cavitating. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a constant-volume mixing tank according to an embodiment of the present utility model. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of a constant-volume mixing tank according to an embodiment of the present utility model. Figure 2 ;

[0025] Figure 3 This is a top view of a constant-volume mixing tank according to an embodiment of the present utility model;

[0026] Figure 4 This is a top view of the stirring assembly according to an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Tank body; 2. Agitator assembly; 201. Agitator blade assembly; 2011. Agitator blade; 202. Rotating shaft; 203. Drive structure; 3. Cleaning assembly; 301. Agitator blade cleaning structure; 3011. First cleaning ball; 302. Cleaning pipeline; 3021. First pipeline; 3022. Second pipeline; 3023. Third pipeline; 303. Tank body cleaning structure; 3031. Second cleaning ball; 304. Third cleaning ball; 4. Overflow pipe; 5. Support leg; 6. Discharge port; 7. Anti-vortex plate; 8. Control valve. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] The constant volume mixing tank usually has an agitator for mixing various materials in the tank. In related technologies, the agitator is a flat agitator, and the mixing direction is biased towards the periphery. During mixing, the tank body 1 shakes a lot, which affects the weighing of the materials in the tank body 1, resulting in inaccurate weighing and easily causing material shortage or material expansion. At the same time, the mixing intensity of the flat agitator is relatively weak, and the uniformity of the product is low.

[0031] The following is combined with Figures 1 to 4 The following describes embodiments of the present invention.

[0032] According to an embodiment of the present invention, a constant volume mixing tank is provided, comprising: a tank body 1, a stirring assembly 2, and a cleaning assembly 3.

[0033] Specifically, the stirring assembly 2 includes multiple stirring blade assemblies 201, which are rotatably disposed within the tank 1. Each stirring blade assembly 201 has multiple stirring blades 2011. The cleaning assembly 3 includes a stirring blade cleaning structure 301 and a cleaning pipeline 302. The stirring blade cleaning structure 301 has multiple first cleaning balls 3011, each of which is connected to the cleaning pipeline 302. Each first cleaning ball 3011 corresponds one-to-one with a stirring blade assembly 201. The first cleaning balls 3011 are disposed on one side of the stirring blade assembly 201 and located at the bottom of the stirring blade assembly 201. The surface of each first cleaning ball 3011 has several water spray holes, and the water spray direction of the several water spray holes is towards the bottom and root of the stirring blade 2011.

[0034] In this embodiment, multiple stirring blade assemblies 201 are coaxially arranged and evenly spaced along the top to bottom of the tank body 1. Each stirring blade assembly 201 has multiple stirring blades 2011, which are rotatably disposed inside the tank body 1. The stirring blades 2011 rotate circumferentially about the axis of the stirring blade assembly 201, thereby stirring the material inside the tank body 1. The stirring blade cleaning structure 301 includes multiple first cleaning balls 3011, the number of which is the same as the number of stirring blade assemblies 201. The first cleaning balls 3011 are located at one of the stirring blade assemblies 201. Located on the side and below the stirring blade assembly 201, the surface of the first cleaning ball 3011 has several water spray holes (not shown). The multiple first cleaning balls 3011 are respectively connected to the cleaning pipe 302. The cleaning liquid enters the first cleaning ball 3011 through the cleaning pipe 302. The first cleaning ball 3011 sprays the cleaning liquid onto the bottom and root of the stirring blade 2011 through several water spray holes. The water spray holes can increase the pressure of the cleaning liquid, so that the cleaning liquid has a certain impact force, thereby rinsing the material remaining at the bottom and root of the stirring blade 2011.

[0035] Preferably, in this embodiment, the tank 1 is provided with three stirring blade assemblies 201 and three first cleaning balls 3011, and the stirring blade assembly 201 has three stirring blades 2011. In other embodiments, the tank 1 is provided with four or five or other numbers of stirring blade assemblies 201 and first cleaning balls 3011, and the number of stirring blade assemblies 201 and first cleaning balls 3011 can be determined according to the height of the tank 1 and the process.

[0036] Specifically, in this embodiment, the first cleaning ball 3011 is horizontally positioned. In other embodiments, the first cleaning ball 3011 may be angled, with its extension direction facing the root of the stirring blade 2011, to facilitate rinsing of the root and bottom of the stirring blade 2011.

[0037] It should be noted that by setting a first cleaning ball 3011 below the stirring blade assembly 201, and the surface of the first cleaning ball 3011 is provided with several water spray holes, the cleaning liquid can be sprayed out from the water spray holes to rinse the bottom and root of the stirring blade 2011, thereby rinsing away the residual material at the bottom and root of the stirring blade 2011 and avoiding the risk of contaminating the beverage.

[0038] In one embodiment, the cleaning structure further includes a tank cleaning structure 303, which has at least one second cleaning ball 3031 disposed inside the tank 1. The surface of the second cleaning ball 3031 has a plurality of water spray holes and is connected to the cleaning pipeline 302.

[0039] In this embodiment, as Figure 2 and Figure 3 As shown, the tank cleaning structure 303 has two second cleaning balls 3031. The two second cleaning balls 3031 are arranged on the top of the tank 1 and are spaced apart from each other. The spaced arrangement of the second cleaning balls 3031 helps to expand the cleaning area. The surface of the second cleaning balls 3031 has several water spray holes. The two second cleaning balls 3031 are respectively connected to the cleaning pipe 302. The cleaning liquid can enter the second cleaning balls 3031 through the cleaning pipe 302. The two second cleaning balls 3031 can rinse the inner wall of the tank 1 and the upper surface of the stirring blade 2011.

[0040] In one embodiment, the tank 1 is connected to the overflow pipe 4, and the cleaning assembly 3 further includes a third cleaning ball 304 disposed in the overflow pipe 4, which is connected to the cleaning pipeline 302.

[0041] In this embodiment, as Figures 1 to 3 As shown, the cleaning assembly 3 also includes a third cleaning ball 304, which is disposed inside the overflow pipe 4 and connected to the cleaning pipeline 302. The surface of the third cleaning ball 304 has several water spray holes, allowing it to rinse the overflow pipe 4. By installing the first cleaning ball 3011 and the second cleaning ball 3031 inside the tank 1, and the third cleaning ball 304 inside the overflow pipe 4, the constant volume mixing tank can be thoroughly cleaned, preventing residues and microorganisms from remaining inside the tank and thus avoiding the risk of contaminating the beverage.

[0042] Specifically, the surface of the cleaning ball is spherical, with several water spray holes distributed on the spherical surface, allowing the cleaning ball to spray water 360°, which helps to expand the cleaning area.

[0043] In one embodiment, the cleaning pipeline 302 includes a first pipeline 3021, a second pipeline 3022, and a third pipeline 3023. The two ends of the first pipeline 3021 are respectively connected to a second cleaning ball 3031 and a cleaning fluid delivery pipe. One end of the second pipeline 3022 is connected to the first pipeline 3021, and the other end of the second pipeline 3022 is respectively connected to a plurality of first cleaning balls 3011. One end of the third pipeline 3023 is connected to the first pipeline 3021, and the other end of the third pipeline 3023 is connected to a third cleaning ball 304.

[0044] In this embodiment, as Figure 2As shown, one end of the first pipeline 3021 is connected to a cleaning fluid delivery pipe (not shown), which is connected to a CIP cleaning device (not shown). The other end of the first pipeline 3021 is connected to two second cleaning balls 3031. The cleaning fluid output from the CIP cleaning device is delivered to the first pipeline 3021 through the cleaning fluid delivery pipe and flows into the second cleaning balls 3031 along the first pipeline 3021. One end of the second pipeline 3022 is connected to the first pipeline 3021. The first cleaning ball 3011 is connected to the second pipeline 3022 through a branch pipe (not shown). The branch pipes of the second pipeline correspond one-to-one with the first cleaning balls 3011. The cleaning fluid entering the second pipeline 3022 from the first pipeline 3021 enters the first cleaning ball 3011 through the branch pipe. The two ends of the third pipe 3023 are connected to the first pipe 3021 and the third cleaning ball 304 respectively. The cleaning fluid that enters the second pipe 3022 from the first pipe 3021 flows into the third cleaning ball 304 along the third pipe 3023.

[0045] It should be noted that when cleaning tank 1, the drain port at the bottom of tank 1 is always open. The cleaning solution after rinsing will be discharged from the drain port and will not remain in tank 1.

[0046] In one embodiment, the stirring assembly 2 further includes a rotating shaft 202 and a driving structure 203. The rotating shaft 202 is rotatably disposed inside the tank 1. The rotating shaft 202 is parallel to or coaxial with the central axis of the tank 1. The first end of the rotating shaft 202 extends out of the tank 1 and is connected to the driving structure 203. A plurality of stirring blade assemblies 201 are spaced apart on the rotating shaft 202 along the axial direction of the rotating shaft 202. The root of the stirring blade 2011 is fixedly connected to the rotating shaft 202. The plurality of stirring blades 2011 of each stirring blade assembly 201 are spaced apart along the circumferential surface of the rotating shaft 202.

[0047] In this embodiment, as Figure 1 and Figure 4 As shown, the stirring assembly 2 also includes a rotating shaft 202 and a drive structure 203. The rotating shaft 202 extends into the tank body 1 and is parallel to the central axis of the tank body 1. The drive structure 203 is mounted on the top cover of the tank body 1. The upper end of the rotating shaft 202 passes through the top of the tank body 1 and connects to the drive structure 203. The drive structure 203 can drive the rotating shaft 202 to rotate. Multiple stirring blade assemblies 201 are spaced apart along the axial direction of the rotating shaft 202, and multiple stirring blades 2011 of each stirring blade assembly 201 are spaced apart along the circumferential surface of the rotating shaft 202. Preferably, the drive structure 203 is a motor.

[0048] In other embodiments, the rotating shaft 202 is coaxially arranged with the tank body 1.

[0049] In this embodiment, as Figure 4As shown, the stirring blade 2011 is obliquely arranged on the rotating shaft 202, the stirring blade 2011 has an angle of 35° with the horizontal plane, and the angle between adjacent stirring blades 2011 in each stirring blade assembly 201 is 109°.

[0050] In this embodiment, as Figure 4 As shown, the stirring blades 2011 of the adjacent stirring blade assembly 201 are staggered, and the angle between the relatively upper stirring blade 2011 and the adjacent relatively lower stirring blade 2011 is 49°.

[0051] Specifically, such as Figure 1 As shown, the tank 1 has three stirring blade assemblies 201. The stirring blades 2011 of the uppermost stirring blade assembly 201 and the stirring blades 2011 of the lowermost stirring blade assembly 201 are arranged in a one-to-one correspondence. The stirring blade assembly 201 located in the middle of the tank 1 has its stirring blades 2011 staggered with the stirring blades 2011 above and below it, as shown. Figure 4 As shown, from a top view of the tank 1, the included angle between adjacent stirring blades 2011 in each stirring blade assembly 201 is 109°. The lower stirring blade 2011 is located between two upper stirring blades 2011, and the included angle between the upper stirring blade 2011 and the adjacent lower stirring blade 2011 is 49°. By setting the included angle between the stirring blade 2011 and the horizontal plane to 35°, the included angle between adjacent stirring blades 2011 in each stirring blade assembly 201 to 109°, and the included angle between the upper stirring blade 2011 and the adjacent lower stirring blade 2011 to 49°, the material in the tank 1 can be fully mixed axially and radially during the stirring process. This ensures the stirring effect while avoiding excessive radial force that could cause the tank 1 to shake, thus reducing the impact on weighing and improving weighing accuracy.

[0052] In one embodiment, the bottom of the tank 1 has multiple legs 5, and a weighing structure is provided on the legs 5.

[0053] In this embodiment, as Figure 2 As shown, the bottom of the tank 1 has three legs 5, which can form a triangular structure. The upper end of the legs 5 is fixedly connected to the tank 1, and the lower end of the legs 5 is placed on the ground. Each leg 5 is equipped with a weighing structure. Preferably, the weighing structure is a resistance weighing sensor. The resistance weighing sensor is connected to the control system. The weight of the three resistance weighing sensors is the net weight of the material in the tank 1.

[0054] In one embodiment, the discharge port 6 of the tank 1 is provided with an anti-vortex plate 7.

[0055] In this embodiment, as Figure 1As shown, the bottom of the tank 1 has a discharge port 6, and the discharge port 6 is equipped with an anti-vortex plate 7. The anti-vortex plate 7 can effectively reduce the generation of air bubbles in the material and prevent the discharge pump from cavitating.

[0056] In one embodiment, control valves 8 are respectively provided on the second pipeline 3022 and the third pipeline 3023, and the control valves 8 can control the opening degree of the second pipeline 3022 and the third pipeline 3023.

[0057] In this embodiment, as Figure 2 As shown, control valves 8 are respectively installed on the second pipeline 3022 and the third pipeline 3023. The control valves 8 are connected to the control system signal. The control system can control the opening degree of the second pipeline 3022 and the third pipeline 3023 through the control valves 8, thereby controlling the rinsing of the first cleaning ball 3011 and the third cleaning ball 304.

[0058] Specifically, during the cleaning of tank 1, the two second cleaning balls 3031 remain open, allowing them to rinse the inner wall of tank 1 and the top of the agitator blade 2011. The control system controls the opening and closing of the first cleaning ball 3011 and the third cleaning ball 304 by controlling the control valves 8 of the second pipeline 3022 and the third pipeline 3023. The first cleaning ball 3011 and the third cleaning ball 304 are opened for 10 seconds every 1 minute. This interval needs to be confirmed by the CIP cleaning effect verification procedure. That is, after all parameters are set, a complete CIP cleaning process is performed. After a professional takes samples from the inside of tank 1, the underside of the agitator blade 2011, or the overflow pipe 4 and determines that there are no microbial residues, the cleaning effect is passed. If the verification is not passed, the parameters need to be adjusted according to the specific results, and finally all cleaning parameters, including the interval time, are determined.

[0059] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A constant volume mix tank characterized by, include: Tank body (1); A stirring assembly (2) includes multiple stirring blade assemblies (201), which are rotatably disposed inside the tank (1). Each stirring blade assembly (201) has multiple stirring blades (2011). The cleaning assembly (3) includes a stirring blade cleaning structure (301) and a cleaning pipeline (302). The stirring blade cleaning structure (301) has a plurality of first cleaning balls (3011). The plurality of first cleaning balls (3011) are all connected to the cleaning pipeline (302). The plurality of first cleaning balls (3011) correspond one-to-one with the plurality of stirring blade assemblies (201). The first cleaning balls (3011) are disposed on one side of the stirring blade assembly (201) and located at the bottom of the stirring blade assembly (201). The surface of the first cleaning balls (3011) has a plurality of water spray holes. The water spraying direction of the plurality of water spray holes is towards the bottom of the stirring blade (2011) and the root of the stirring blade (2011).

2. The constant volume mix tank of claim 1, wherein, The cleaning structure further includes a tank cleaning structure (303), which has at least one second cleaning ball (3031). The second cleaning ball (3031) is disposed inside the tank (1). The surface of the second cleaning ball (3031) has a plurality of water spray holes. The second cleaning ball (3031) is connected to the cleaning pipeline (302).

3. The constant volume mix tank of claim 2, wherein, The tank (1) is connected to the overflow pipe (4), and the cleaning assembly (3) further includes a third cleaning ball (304) disposed in the overflow pipe (4), and the third cleaning ball (304) is connected to the cleaning pipeline (302).

4. The constant volume mix tank of claim 3, wherein, The cleaning pipeline (302) includes a first pipeline (3021), a second pipeline (3022), and a third pipeline (3023). The two ends of the first pipeline (3021) are respectively connected to the second cleaning ball (3031) and the cleaning fluid delivery pipe. One end of the second pipeline (3022) is connected to the first pipeline (3021), and the other end of the second pipeline (3022) is respectively connected to a plurality of the first cleaning balls (3011). One end of the third pipeline (3023) is connected to the first pipeline (3021), and the other end of the third pipeline (3023) is connected to the third cleaning ball (304).

5. The constant-volume mix tank of any one of claims 1 to 4, wherein, The stirring assembly (2) further includes a rotating shaft (202) and a driving structure (203). The rotating shaft (202) is rotatably disposed inside the tank (1). The rotating shaft (202) is parallel to or coaxial with the central axis of the tank (1). The first end of the rotating shaft (202) extends out of the tank (1) and is connected to the driving structure (203). A plurality of stirring blade assemblies (201) are spaced apart on the rotating shaft (202) along the axial direction of the rotating shaft (202). The root of the stirring blade (2011) is fixedly connected to the rotating shaft (202). A plurality of stirring blades (2011) of each stirring blade assembly (201) are spaced apart along the circumferential surface of the rotating shaft (202).

6. The constant volume mix tank of claim 5, wherein, The stirring blade (2011) is obliquely arranged on the rotating shaft (202), the stirring blade (2011) has an angle of 35° with the horizontal plane, and the angle between adjacent stirring blades (2011) in each stirring blade assembly (201) is 109°.

7. The constant volume mix tank of claim 6, wherein, The stirring blades (2011) of adjacent stirring blade assemblies (201) are staggered, and the angle between the relatively upper stirring blade (2011) and the adjacent relatively lower stirring blade (2011) is 49°.

8. The constant volume mixing tank according to claim 6 or 7, characterized in that, The tank (1) has multiple legs (5) at the bottom, and a weighing structure is provided on the legs (5).

9. The constant volume mix tank of claim 8, wherein, The discharge port (6) of the tank (1) is equipped with an anti-vortex plate (7).

10. The constant volume mix tank of claim 4, wherein, Control valves (8) are respectively provided on the second pipeline (3022) and the third pipeline (3023), and the control valves (8) can control the opening degree of the second pipeline (3022) and the third pipeline (3023).

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