Filling head and filling device

Abstract

A filling head comprises a filling head body, a feeding cavity is formed in the upper portion of the filling head body, and the filling head is characterized in that a plurality of discharging slits in the vertical direction are formed in the lower portion of the filling head body, the upper end of each discharging slit is communicated with the feeding cavity, and the lower end of each discharging slit is opened in the bottom face of the filling head body; the width of the discharging slit is smaller than or equal to 2 mm, and the height of the discharging slit is larger than or equal to 1 cm. The utility model further provides a filling device with the filling head. The filling head is used for filling liquid materials, bubbles in the liquid materials can be effectively eliminated or reduced, and the bubbles of the liquid materials filled into a packaging container are greatly reduced.

Description

Technical Field

[0001] The utility model relates to liquid filling equipment, in particular to a filling head and a filling device with the filling head. Background Art

[0002] A filling device for liquid materials typically includes a liquid filling valve and a filling head. The liquid filling valve generally includes a valve seat, a valve core, and a valve core position switching mechanism. The valve seat is provided with a liquid inlet and a liquid outlet, and the valve core is located in the valve seat cavity. The upper portion of the filling head is provided with a feed cavity, and the lower portion of the filling head is provided with an up-and-down discharge channel. The upper end of the discharge channel is connected to the feed cavity, and the lower end of the discharge channel opens to the bottom surface of the filling head body. The feed cavity in the upper portion of the filling head is connected to the liquid outlet on the valve seat. The liquid inlet on the valve seat is connected to the liquid material supply device. When the upper filling device is used to fill liquid materials, the valve core position switching mechanism switches the position of the valve core, so that the liquid inlet and the liquid outlet on the valve seat are connected, the liquid filling valve is opened, and the liquid material provided by the liquid material supply device enters the valve seat from the liquid inlet, and flows from the liquid outlet to the feed cavity on the filling head, and flows out through the discharge channel on the filling head to fill the packaging container; when the filling amount reaches the predetermined amount, the valve core position switching mechanism switches the position of the valve core again, so that the liquid inlet and the liquid outlet on the valve seat are no longer connected (the valve core usually closes both the liquid inlet and the liquid outlet), the liquid filling valve is in a closed state, and the filling is completed.

[0003] Most liquid materials need to be stirred during the production process so that their various components are fully dissolved and mixed evenly. Liquid materials such as milk or soy milk, etc., have a certain viscosity and strong surface tension due to the presence of ingredients such as protein. Therefore, air will be stirred into the liquid during the stirring process to produce a large number of bubbles. After being filled into the packaging container through the filling device, there will often be a large number of bubbles floating on the liquid surface, affecting the appearance and quality of the product. Therefore, how to reduce or eliminate bubbles in liquid materials is a problem that needs to be solved in this field. The applicant has tried to add a plurality of filter screens arranged in sequence from top to bottom in the feed cavity and the discharge channel, hoping to remove the bubbles in the liquid material by step-by-step filtration of the filter screens, but the defoaming effect is not ideal. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a filling head and a filling device having such a filling head. When such a filling head is used to fill liquid materials, it can effectively eliminate or reduce bubbles in the liquid materials, thereby greatly reducing bubbles in the liquid materials filled into the packaging container. The technical solution adopted is as follows:

[0005] A filling head comprises a filling head body, wherein a feed cavity is provided in the upper portion of the filling head body. The filling head is characterized in that: a plurality of discharge slits running vertically are provided in the lower portion of the filling head body, the upper end of each discharge slit is connected to the feed cavity, and the lower end of each discharge slit is open to the bottom surface of the filling head body; the width of the discharge slit is ≤ 2 mm, and the height of the discharge slit is ≥ 1 cm.

[0006] The sum of all the discharge slits constitutes the discharge channel of the filling head. The above-mentioned filling head is used for filling (filling) liquid materials, and its defoaming principle is as follows: driven by the liquid flow, the liquid material enters the upper end of the discharge slit and flows downward in the discharge slit. When the liquid material enters the upper end of the discharge slit, the bubbles it contains are cut by the edges on both sides of the upper end of the discharge slit. In the process of the liquid material flowing downward in the discharge slit, the bubbles it contains are squeezed by the inner walls on both sides of the discharge slit. The above cutting and squeezing effects can cause the bubbles to burst. In addition, after completing one filling, before the next filling, the liquid material remaining in the discharge slit acts as a liquid seal to prevent the liquid material from dripping (once the liquid material flows downward, negative pressure will be generated in the feed chamber, preventing the liquid material from flowing further downward and dripping).

[0007] In a preferred embodiment, the width of the discharge slit is 0.3-2 mm. Generally, the smaller the width of the discharge slit, the better the defoaming effect. However, if the width of the discharge slit is too small, the processing difficulty will increase.

[0008] In a preferred embodiment, the height of the discharge slit is 1-3 cm. Generally, the greater the height of the discharge slit, the better the defoaming effect. However, if the height of the discharge slit is too large, the material cost and processing difficulty will increase.

[0009] In a preferred embodiment, a downwardly projecting portion is provided at the center of the bottom surface of the filling head body, and the lower ends of the discharge slits are opened on the lower surface of the projecting portion.

[0010] On the cross section of the filling head body, the discharge slits may be linear or curved; when the discharge slits are linear, the discharge slits may be parallel to each other or have a certain angle with each other.

[0011] In a preferred embodiment, in the cross-section of the filling head body, each discharge slit is linear; the discharge slits are divided into multiple groups, each group of which is arranged in sequence along the circumference of the filling head body; each group of discharge slits is composed of multiple discharge slits that are parallel to each other; and two adjacent groups of discharge slits in the circumferential direction have an angle greater than 0 and less than or equal to 90° between each other. In a specific embodiment, the discharge slits are divided into four groups, each group of which is arranged in sequence along the circumference of the filling head body; each group of discharge slits is composed of multiple discharge slits that are parallel to each other; and two adjacent groups of discharge slits in the circumferential direction have an angle equal to 90° between each other. More preferably, the inner ends of the discharge slits are interconnected.

[0012] In another preferred embodiment, in the cross section of the filling head body, each of the discharge slits is linear; and each of the discharge slits is parallel to each other.

[0013] In a preferred embodiment, the filling head further comprises an upper guide plate and a lower guide plate, both of which are located in the feed chamber at the top of the filling head body. The upper guide plate is superimposed on the lower guide plate, with a guide gap defined between the lower surface of the upper guide plate and the upper surface of the lower guide plate. The upper guide plate is provided with a plurality of upper guide holes, and the lower guide plate is provided with a plurality of lower guide holes. The lower end of each upper guide hole and the upper end of each lower guide hole are both connected to the guide gap. The lower end of the lower guide hole corresponds to the upper end of the discharge slit. The upper guide holes, the guide gap, and the lower guide holes serve as guides.

[0014] In one specific embodiment, the number, size, arrangement, and spacing of the upper flow holes on the upper guide plate are identical to those of the lower flow holes on the lower guide plate. The upper flow holes can be aligned one-to-one with the lower flow holes, or they can be staggered circumferentially. When the upper and lower flow holes are staggered circumferentially, they can function as cross-flow guides.

[0015] In a more preferred embodiment, a lower groove is provided on the upper surface of the above-mentioned lower guide plate, and the upper end of each lower guide hole is connected to the cavity of the lower groove (for example, the upper end of each lower guide hole is open to the bottom of the lower groove); the lower surface of the upper guide plate and the bottom and wall of the lower groove together form the guide gap.

[0016] In a more preferred embodiment, an upper groove is provided on the upper surface of the upper guide plate, and the upper end of each upper guide hole is communicated with the cavity of the upper groove.

[0017] In a more preferred embodiment, an elastic gasket is superimposed on the upper surface of the upper guide plate, with each upper guide hole located inside the elastic gasket. If an upper groove is provided on the upper surface of the upper guide plate, the elastic gasket surrounds the groove. The elastic gasket can be made of silicone, thermoplastic elastomer (TPE), or rubber. The elastic gasket provides both cushioning and sealing functions. If the liquid filling valve is a plunger valve, the plunger valve core typically contacts the elastic gasket during descent, reducing the impact force of the valve core on the filling head. Furthermore, the contact surface between the elastic gasket and the valve core forms a seal, preventing leakage.

[0018] The utility model also provides a filling device having the aforementioned filling head. The filling device comprises a liquid filling valve and the aforementioned filling head. The liquid filling valve comprises a valve seat, a valve core, and a valve core position switching mechanism. The valve seat is provided with a liquid inlet and a liquid outlet, and the valve core is located within a cavity of the valve seat. The feed cavity in the upper portion of the filling head body communicates with the liquid outlet on the valve seat. The liquid inlet on the valve seat communicates with a liquid material supply device.

[0019] In a specific scheme, the above-mentioned liquid filling valve adopts a plunger valve, whose valve seat is cylindrical, the liquid inlet is arranged on the side wall of the cylindrical valve seat, the lower end opening of the cylindrical valve seat constitutes the liquid outlet, and the valve core is in the cylindrical valve seat; the valve core position switching mechanism includes a valve stem and a valve stem lifting drive mechanism, the lower end of the valve stem is connected to the upper end of the valve core, and the upper end of the valve stem extends from the upper end opening of the cylindrical valve seat and is connected to the output power end of the valve stem lifting drive mechanism. When filling liquid materials, the valve core position switching mechanism drives the valve stem and the valve core to rise, generating negative pressure in the part of the valve seat cavity below the liquid inlet and inside the feed cavity; when the lower end of the valve core is higher than the liquid inlet, the liquid inlet and the liquid outlet on the valve seat are connected, and the liquid material provided by the liquid material supply device enters the valve seat from the liquid inlet and flows from the liquid outlet to the feed cavity on the filling head; after the liquid material fills the part of the valve seat cavity below the liquid inlet and the feed cavity, the valve core position switching mechanism drives the valve stem and the valve core to descend, and the side wall of the valve core blocks the liquid inlet and can exert a downward thrust on the liquid material, so that the liquid material flows out through the discharge channel on the filling head to fill the packaging container; after the valve core descends to the predetermined position, the liquid inlet and the liquid outlet are both closed, the liquid filling valve is in a closed state, and a predetermined amount of liquid material has entered the packaging container, completing the filling.

[0020] The valve stem lifting mechanism typically includes a cylinder with a downwardly facing piston rod connected to the upper end of the valve stem. The valve stem lifting mechanism may also include a gear, a rack, and a motor, with the rack meshing with the gear, the gear being in driving connection with the motor, and the lower end of the rack being connected to the upper end of the valve stem. The valve stem lifting mechanism may also include a motor, an eccentric, and a connecting rod, with the motor being in driving connection with the eccentric, one end of the connecting rod being connected to the eccentric, and the other end of the connecting rod being connected to the upper end of the valve stem.

[0021] In a specific solution, an outer annular ridge is provided on the outer wall of the top of the filling head body, and the outer wall of the lower end of the cylindrical valve seat has an external thread; the filling head body is installed on the lower end of the cylindrical valve seat through a nut, and an inner annular ridge is provided on the lower side of the screw hole of the nut, and the outer annular ridge is located in the screw hole of the nut, and the upper surface of the inner annular ridge is in close contact with the lower surface of the outer annular ridge.

[0022] The filling head of the present utility model is used for filling (filling) liquid materials. Driven by the liquid flow, the liquid material enters the upper end of the discharge slit and flows downward in the discharge slit. When the liquid material enters the upper end of the discharge slit, the bubbles contained in the liquid material are cut by the edges on both sides of the upper end of the discharge slit. During the process of flowing downward in the discharge slit, the bubbles contained in the liquid material are squeezed by the inner walls on both sides of the discharge slit. The above cutting and squeezing effects can cause the bubbles to burst, thereby effectively eliminating or reducing bubbles in the liquid material. Therefore, using the filling head of the present utility model for filling (filling) liquid materials can effectively eliminate or reduce bubbles in the liquid material, greatly reducing bubbles in the liquid material filled into the packaging container. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a filling head according to a preferred embodiment 1 of the present invention;

[0024] Figure 2 yes Figure 1 A cross-sectional view of the filling head body taken along line AA;

[0025] Figure 3 yes Figure 1 Top view of the middle and upper orifice plate;

[0026] Figure 4 yes Figure 1 Top view of the middle and lower orifice plates;

[0027] Figure 5 This is a structural diagram of the filling device of the preferred embodiment 1 of the present invention (filling valve discharge state);

[0028] Figure 6 This is a schematic structural diagram of a filling head according to a preferred embodiment 2 of the present invention;

[0029] Figure 7 yes Figure 6 Cross-sectional view of the BB of the filling head body. DETAILED DESCRIPTION

[0030] Example 1, reference Figures 1 to 4 This filling head includes a filling head body 1, a feed cavity 2 is provided in the upper part of the filling head body 1, and a plurality of discharge slits 3 running up and down are provided in the lower part of the filling head body 1. The upper end of each discharge slit 3 is connected to the feed cavity 2, and the lower end of each discharge slit 3 is open on the bottom surface of the filling head body 1; the width of the discharge slit 3 is 0.3-2 mm; the height of the discharge slit 3 is 1-3 cm.

[0031] In this embodiment, a downwardly facing protrusion 4 is provided at the center of the bottom surface of the filling head body 1 , and the lower end of each discharge slit 3 opens on the lower surface of the protrusion 4 .

[0032] refer to Figure 2 In this embodiment, in the cross section of the filling head body 1, each discharge slit 3 is linear; the discharge slits 3 are divided into four groups, and the discharge slits 3-1, 3-2, 3-3, and 3-4 of each group are arranged in sequence along the circumference of the filling head body 1; each group of discharge slits 3-1, 3-2, 3-3, and 3-4 is composed of four (or other numbers) parallel discharge slits 3; two adjacent groups of discharge slits in the circumferential direction have an angle of 90° with each other (for example, an angle of 90° between one group of discharge slits 3-1 and another adjacent group of discharge slits 3-2, and so on). The inner ends of the discharge slits 3 are connected to each other, with reference to FIG. Figure 3 The inner ends of the four discharge slits 3 in each group of discharge slits are connected by a connecting slit 5, and the connecting slits 5 are also interconnected. The connecting slits 5 are also 0.3-2 mm wide and can also accommodate liquid materials, effectively acting as discharge slits. The discharge slits 3 and the connecting slits 5 together form the discharge channel of the filling head.

[0033] The filling head of this embodiment also includes an upper guide plate 6 and a lower guide plate 7. Both the upper guide plate 6 and the lower guide plate 7 are located in the feed chamber 2 at the top of the filling head body 1. The upper guide plate 6 is stacked on the lower guide plate 7, and a guide gap 8 is defined between the lower surface of the upper guide plate 6 and the upper surface of the lower guide plate 7. The upper guide plate 6 is provided with a plurality of upper guide holes 9, and the lower guide plate 7 is provided with a plurality of lower guide holes 10. The lower end of each upper guide hole 9 and the upper end of each lower guide hole 10 are both connected to the guide gap 8. The lower end of the lower guide hole 10 corresponds to the upper end of the discharge slit 3. In this embodiment, the number, size, arrangement, and spacing of the upper guide holes 9 on the upper guide plate 6 are the same as those of the lower guide holes 10 on the lower guide plate 7. The upper guide holes 9 can be aligned one-to-one with the lower guide holes 10, or they can be staggered circumferentially.

[0034] A lower groove 11 is provided on the upper surface of the lower guide plate 7, and the upper end of each lower guide hole 10 is connected to the cavity of the lower groove 11 (for example, the upper end of each lower guide hole 10 is open to the bottom of the lower groove 11); the lower surface of the upper guide plate 6 and the bottom and wall of the lower groove 11 together form the guide gap 8.

[0035] An upper groove 12 is provided on the upper surface of the upper guide plate 6 , and the upper end of each upper guide hole 9 is communicated with the cavity of the upper groove 12 .

[0036] An elastic gasket 13 is stacked on the upper surface of the upper guide plate 6, and each upper guide hole 9 is located inside the elastic gasket 13 (the elastic gasket 13 surrounds the upper groove 12). The elastic gasket 13 can be made of silicone, thermoplastic elastomer (TPE) or rubber.

[0037] refer to Figure 5 The filling device includes a liquid filling valve and the above-mentioned filling head; the liquid filling valve includes a valve seat 14, a valve core 15 and a valve core position switching mechanism, the valve seat 14 is provided with a liquid inlet 16 and a liquid outlet 17, and the valve core 15 is located in the cavity of the valve seat 14; the feed cavity 2 in the upper part of the filling head body 1 is connected to the liquid outlet 17 on the valve seat 14.

[0038] The liquid inlet 16 on the valve seat 14 is communicated with the liquid material supply device.

[0039] In this embodiment, the liquid filling valve is a plunger valve. Its valve seat 14 is cylindrical, with a liquid inlet 16 disposed on the sidewall of the cylindrical valve seat 14. The lower opening of the cylindrical valve seat 14 forms a liquid outlet 17. A valve core 15 is located within the cylindrical valve seat 14. The valve core position switching mechanism includes a valve stem 18 and a valve stem lifting drive mechanism. The lower end of the valve stem 18 is connected to the upper end of the valve core 15, while the upper end of the valve stem 18 extends from the upper opening of the cylindrical valve seat 14 and is connected to the output power terminal of the valve stem lifting drive mechanism. The valve stem lifting drive mechanism can be conventionally used and will not be described in detail here.

[0040] An outer annular ridge 19 is provided on the outer wall of the top of the filling head body 1, and the outer wall of the lower end of the cylindrical valve seat 14 has external threads. The filling head body 1 is mounted on the lower end of the cylindrical valve seat 14 using a nut 20. An inner annular ridge 21 is provided below the threaded hole of the nut 20. The outer annular ridge 19 is positioned within the threaded hole of the nut, and the upper surface of the inner annular ridge 21 is in close contact with the lower surface of the outer annular ridge 19. A sealing ring 22 is provided at the junction between the top of the filling head body 1 and the lower end of the cylindrical valve seat 14.

[0041] The working principle of the above filling device is briefly described below:

[0042] When filling liquid materials, the valve core position switching mechanism drives the valve stem 18 and the valve core 15 to rise, generating negative pressure in the portion of the valve seat cavity below the liquid inlet 16 and inside the feed cavity 2; when the lower end of the valve core 15 is higher than the liquid inlet 16, the liquid inlet 16 is connected to the liquid outlet 17, and the liquid material provided by the liquid material supply device enters the valve seat 14 from the liquid inlet 16 and flows from the liquid outlet 17 to the feed cavity 2 on the filling head; the liquid material fills the valve seat cavity at the liquid inlet 16. After the lower part and the feed chamber 2, the valve core position switching mechanism drives the valve stem 18 and the valve core 15 to descend. After the side wall of the valve core 15 blocks the liquid inlet 16, it can exert a downward thrust on the liquid material, so that the liquid material flows out through the discharge channel on the filling head to fill the packaging container; after the valve core 15 descends to the predetermined position, the liquid inlet 16 and the liquid outlet 17 are both closed, the liquid filling valve is in a closed state, and a predetermined amount of liquid material has entered the packaging container, completing the filling.

[0043] The filling head is used for filling (filling) liquid materials. Its defoaming principle is: driven by the liquid flow, the liquid material enters the upper end of the discharge slit 3 and flows downward in the discharge slit 3. When the liquid material enters the upper end of the discharge slit 3, the bubbles contained in it are cut by the edges on both sides of the upper end of the discharge slit 3. In the process of the liquid material flowing downward in the discharge slit 3, the bubbles contained in it are squeezed by the inner walls on both sides of the discharge slit. The above cutting and squeezing effects can cause the bubbles to burst.

[0044] In addition, after completing one filling, before the next filling, the liquid material remaining in the discharge slit 3 acts as a liquid seal to prevent the liquid material from dripping (once the liquid material flows downward, negative pressure will be generated in the feed chamber 2, preventing the liquid material from flowing further downward and dripping).

[0045] Example 2, reference Figures 6 and 7 In this embodiment, in the cross section of the filling head body 1, each discharge slit 3 is linear; each discharge slit 3 is parallel to each other. The rest of the structure of this embodiment can refer to that of embodiment 1.

Claims

1. A filling head, comprising a filling head body, wherein a feeding cavity is provided in the upper portion of the filling head body, and wherein: A plurality of discharge slits running up and down are provided in the lower part of the filling head body. The upper end of each discharge slit is connected to the feed cavity, and the lower end of each discharge slit is open to the bottom surface of the filling head body; the width of the discharge slit is ≤2 mm, and the height of the discharge slit is ≥1 cm.

2. The filling head according to claim 1, characterized in that: The width of the discharge slit is 0.3-2 mm; the height of the discharge slit is 1-3 cm.

3. The filling head according to claim 1, characterized in that: A downward convex portion is provided at the center of the bottom surface of the filling head body, and the lower ends of the discharge slits are opened on the lower surface of the convex portion.

4. The filling head according to claim 1, characterized in that: On the cross section of the filling head body, each discharge slit is straight; the discharge slits are divided into multiple groups, and each group of discharge slits is arranged in sequence along the circumference of the filling head body; each group of discharge slits is composed of multiple discharge slits parallel to each other; and the angle between two adjacent groups of discharge slits in the circumferential direction is greater than 0 and less than or equal to 90°.

5. The filling head according to claim 1, characterized in that: On the cross section of the filling head body, each discharge slit is linear; and each discharge slit is parallel to each other.

6. The filling head according to claim 1, characterized in that: The filling head also includes an upper guide plate and a lower guide plate, both of which are located in the feed cavity on the upper part of the filling head body, the upper guide plate is superimposed on the lower guide plate, and a guide gap is provided between the lower surface of the upper guide plate and the upper surface of the lower guide plate; a plurality of upper guide holes are provided on the upper guide plate, and a plurality of lower guide holes are provided on the lower guide plate, the lower end of each upper guide hole and the upper end of each lower guide hole are connected to the guide gap; the lower end of the lower guide hole corresponds to the upper end position of the discharge slit.

7. The filling head according to claim 6, characterized in that: A lower groove is provided on the upper surface of the lower guide plate, and the upper end of each lower guide hole is connected to the cavity of the lower groove; the lower surface of the upper guide plate and the groove bottom and groove wall of the lower groove together form the guide gap.

8. The filling head according to claim 6, characterized in that: An upper groove is provided on the upper surface of the upper guide plate, and the upper end of each upper guide flow hole is communicated with the cavity of the upper groove.

9. The filling head according to claim 6, characterized in that: An elastic washer is stacked on the upper surface of the upper guide plate, and each upper guide flow hole is located inside the elastic washer.

10. A filling device, characterized by: It comprises a liquid filling valve and a filling head according to any one of claims 1 to 9; the liquid filling valve comprises a valve seat, a valve core and a valve core position switching mechanism, the valve seat is provided with a liquid inlet and a liquid outlet, and the valve core is located in the cavity of the valve seat; the feed cavity in the upper part of the filling head body is connected to the liquid outlet on the valve seat.

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