A dual-purpose filling valve

Abstract

The invention discloses a dual-purpose filling valve, which relates to the field of filling valve structure, and in particular to a dual-purpose filling valve. A dual-purpose filling valve is proposed, which can be used for isobaric filling of carbonated beverages or beer, and can be used for hot filling of non-carbonated materials. It includes a valve body and a valve stem, and a liquid outlet channel is provided in the valve body; the dual-purpose filling valve also includes a back pressure chamber and a pressure relief reflux chamber; a return air channel is provided in the valve body, and the bottom of the return air channel is connected to the bottom of the valve body; the liquid outlet channel is connected to the pressure relief reflux chamber through a reflux valve, and the return air channel is connected to the pressure relief reflux chamber through a pressure relief valve, and the return air channel is also connected to the back pressure chamber through a back pressure valve. It can be used for isobaric filling of carbonated beverages or beer, and can be used for hot filling of non-carbonated materials, which significantly improves production efficiency. The material flows down in a columnar shape from the center of the container, which can effectively prevent the material from sticking to the surface of the can mouth sealing ring and polluting the mouth of the container.

Description

Technical Field

[0001] The invention relates to the field of filling valve structures, in particular to a dual-purpose filling valve which can be used for low-temperature isobaric filling of carbonated beverages and beer and can also be used for hot filling of non-carbonated beverages. Background Art

[0002] Carbonated beverages or beer usually adopt low-temperature isobaric filling process (filling under a certain pressure), while many non-carbonated beverages such as juice and tea need to adopt hot filling process. The former needs to use isobaric filling valve for filling, while the latter needs to use hot filling valve for filling; isobaric filling valve has the function of back pressure and pressure relief, while hot filling valve has the function of material reflux in the valve. The two filling valves have different structures and working principles, so the two filling processes cannot be completed on one filling machine.

[0003] Specifically:

[0004] Since carbonated beverages or beer require isobaric filling valves, general hot filling valves do not have isobaric function. Therefore, if hot filling valves are used to fill carbonated beverages or beer, it will directly lead to filling failure and the problem of being unable to fill will occur. If isobaric filling valves are used to hot fill still beverages, the following problems will arise:

[0005] 1. The hot filling process needs to ensure that the material filled into the container exceeds a certain temperature (usually above 88°C), but the isobaric filling valve does not have a liquid material reflux function. When the filling is suspended due to equipment failure or other reasons, the temperature of the material in the filling valve will drop. When the filling is restarted, the temperature of the product at the beginning will not meet the process requirements.

[0006] 2. In order to reduce the disturbance of liquid materials, the isobaric filling valve is designed to allow the liquid materials to flow down along the inner wall of the container being filled and fill into the container. Figure 1 However, when used for hot filling, the material flowing down the inner wall of the container will stick to the surface of the container mouth and the can mouth sealing ring. Due to the high temperature of the material, these materials are easy to dry and stick to the surface of the can mouth sealing ring, polluting the container mouth, and even making the container stick to the can mouth sealing ring and unable to be removed. The can mouth sealing ring has to be cleaned frequently, affecting continuous production and product quality.

[0007] Therefore, when a production line needs to produce both carbonated beverages and beer and hot-filled beverages without beverages, it usually requires two filling machines or two filling valves to be interchanged, which results in low production efficiency and extremely inconvenient operation. Summary of the invention

[0008] In view of the above problems, the present invention proposes a dual-purpose filling valve which can be used for isobaric filling of carbonated beverages or beer and hot filling of non-carbonated materials.

[0009] The technical solution of the present invention is as follows: it comprises a valve body 26 and a valve stem 7, wherein a liquid outlet channel is provided in the valve body 26, wherein the valve stem 7 is arranged in the liquid outlet channel in a liftable manner, and the side wall of the valve stem 7 is sealed with the top of the liquid outlet channel, and the discharge hole at the bottom of the liquid outlet channel is exposed or blocked by the valve stem 7;

[0010] The dual-purpose filling valve further includes a back pressure chamber 23 and a pressure relief reflux chamber 24;

[0011] The valve body 26 is provided with a return air passage 29, and the bottom opening of the return air passage 29 is connected to the bottom of the valve body 26;

[0012] The outer wall of the valve body 26 is provided with a reflux groove, a pressure relief groove and a back pressure groove, wherein the reflux groove, the pressure relief groove and the back pressure groove are provided with a reflux valve 9, a pressure relief valve 10 and a back pressure valve 11 respectively;

[0013] The liquid outlet channel is connected to the pressure relief reflux chamber 24 through the reflux valve 9 , the air return channel 29 is connected to the pressure relief reflux chamber 24 through the pressure relief valve 10 , and the air return channel 29 is also connected to the back pressure chamber 23 through the back pressure valve 11 .

[0014] The back pressure chamber 23 is connected to the upper part of the material cylinder 20 .

[0015] The pressure relief reflux chamber 24 is connected to the atmospheric pressure or the material bin.

[0016] The bottom of the valve stem 7 is tapered.

[0017] The discharge hole is located at the center of the tank mouth sealing sleeve 4.

[0018] The dual-purpose filling valve further comprises a material pipe 19 and a slow filling valve 17. The material pipe 19 is connected to a material cylinder 20 for isobaric filling or a material bin for hot filling. The slow filling valve 17 is arranged in the material pipe 19 to control the area of ​​the internal flow channel.

[0019] The valve core of the slow filling valve 17 is provided with a slow filling channel.

[0020] The beneficial effects of the present invention are:

[0021] 1. This case combines the functions of back pressure, pressure relief and reflux, and can be used for isobaric filling of carbonated beverages or beer, as well as hot filling of non-carbonated materials, which significantly improves production efficiency and avoids defects such as low production efficiency and long production cycle due to replacement of filling valves.

[0022] 2. During filling in this case, the material flows down from the center of the container in a columnar shape. Figure 2, instead of flowing down along the inner wall of the container, the material will not come into contact with the tank mouth sealing ring, which can effectively prevent the material from sticking to the surface of the tank mouth sealing ring and contaminating the mouth of the container.

[0023] 3. When filling materials that are sensitive to oxidation (such as beer), the back pressure reduces the contact area between the material and the air, and the oxygen content of the material in the container after filling is lower, which improves the product quality.

[0024] 4. In this case, the slow filling valve for controlling high-speed and slow filling of materials is installed on the material pipeline, rather than on the return air channel during filling (the filling flow rate is controlled by controlling the return air speed). When slow filling is performed for the first time, the flow rate control is more accurate (if the return air speed is used to control the filling flow rate, when filling just starts, the pressure in the container is not yet equal to the pressure of the material out of the filling nozzle, and the filling flow rate will be faster), thereby effectively avoiding the material from impacting the bottom of the bottle to produce a large amount of foam, or splashing and gas entrainment in the early stage of filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the background technology when the material flows out.

[0026] Figure 2 This is a schematic diagram of the structure of this case when the material is flowing out.

[0027] Figure 3 It is a schematic diagram of the structure of this case;

[0028] In the figure, 1 is a container support plate, 2 is a container, 3 is a tank mouth sealing ring, 4 is a tank mouth sealing sleeve, 5 is a liquid valve sealing ring, 6 is a sliding sealing ring, 7 is a valve stem, 8 is a guide rod, 9 is a reflux valve, 10 is a pressure relief valve, 11 is a back pressure valve, 12 is a cam, 13 is a roller, 14 is a sealing bellows, 15 is a downward pressure cylinder, 16 is a liquid valve cylinder, 17 is a slow filling valve, 18 is a flow meter, 19 is a material pipe, 20 is a material cylinder, 21 is a material, 22 is a back pressure gas, 23 is a back pressure chamber, 24 is a pressure relief reflux chamber, 25 is a filling valve mounting ring, 26 is a valve body, 27 is a return spring, 28 is an annular nozzle, and 29 is a return air channel. DETAILED DESCRIPTION

[0029] In order to clearly illustrate the technical features of this patent, the following is a specific implementation method and its attached Figure 1-3 , this patent is elaborated in detail.

[0030] Figure 3Except for the cam 12, the parts shown in the figure are all installed on the filling valve mounting ring 25 of the filling machine and rotate together. It includes a valve body 26 and a valve stem 7. The valve body 26 is provided with a liquid outlet channel, and the liquid outlet channel is connected to the material cylinder or the material bin. The valve stem 7 can be lifted and lowered in the liquid outlet channel, and the side wall of the valve stem 7 is sealed with the top of the liquid outlet channel. The upper part of the valve stem 7 is provided with a sealing bellows 14, through which the discharge hole at the bottom of the liquid outlet channel is exposed or blocked; the valve body 26 is fixedly connected to the filling valve mounting ring 25; the valve stem 7 is also fixedly connected to the liquid valve cylinder 16, and the liquid valve cylinder 16 is fixedly connected to the filling valve mounting ring 25, and the valve stem 7 is driven downward by the liquid valve cylinder 16. A limit ring is fixedly connected to the valve stem 7 or the piston rod of the liquid valve cylinder 16, and a return spring 27 is provided between the limit ring and the valve body 26, and the valve stem 7 is driven upward by the return spring 27;

[0031] Thus, when the liquid valve needs to be closed, the piston rod of the liquid valve cylinder 16 extends, the valve stem 7 moves downward, the liquid valve sealing ring 5 mounted on the valve stem 7 is pressed against the inner conical surface of the lower part of the valve body 26, and the liquid valve is closed;

[0032] When the liquid valve needs to be opened, the piston rod of the liquid valve cylinder 16 is retracted, the valve stem 7 rises under the action of the return spring 27, the liquid valve sealing ring 5 is separated from the inner cone surface at the bottom of the valve seat 26, and the liquid valve is opened.

[0033] The dual-purpose filling valve further includes a back pressure chamber 23 and a pressure relief reflux chamber 24;

[0034] The valve body 26 is provided with a return air passage 29, the bottom of which is connected to the bottom of the valve body 26; specifically, a tank mouth sealing sleeve 4 adapted to the tank mouth is fixedly connected to the bottom of the valve body 26, and a tank mouth sealing ring 3 for sealing the tank mouth is fixedly connected to the bottom surface of the tank mouth sealing sleeve 4; a discharge hole and an annular nozzle 28 are provided on the bottom surface of the valve body 26, the annular nozzle 28 is connected to the bottom of the return air passage 29, and the annular nozzle 28 is located on the inner side of the tank mouth sealing sleeve 4, and the discharge hole is located on the inner side of the annular nozzle 28;

[0035] In this way, the back pressure gas and the gas in the tank can enter and exit the return gas channel through the annular nozzle 28, and the liquid in the liquid outlet channel can flow downward through the discharge hole;

[0036] The outer wall of the valve body 26 is provided with a reflux groove, a pressure relief groove and a back pressure groove, and the reflux groove, the pressure relief groove and the back pressure groove are respectively provided with a reflux valve 9, a pressure relief valve 10 and a back pressure valve 11 for independently closing or opening each groove;

[0037] The liquid outlet channel is connected to the pressure relief reflux chamber 24 through the reflux valve 9 , the air return channel 29 is connected to the pressure relief reflux chamber 24 through the pressure relief valve 10 , and the air return channel 29 is connected to the back pressure chamber 23 through the back pressure valve 11 .

[0038] When this case is used, the back pressure gas in the back pressure chamber can be controlled to be injected into the tank along the return gas channel through the back pressure valve, the material in the liquid outlet channel can be controlled to return to the pressure relief return gas chamber through the reflux valve, and the gas in the return gas channel can be controlled to release pressure in the pressure relief return gas chamber through the pressure relief valve. Thus, this case has the functions of back pressure, pressure relief and reflux, and can be used for isobaric filling of carbonated beverages or beer, and hot filling of non-carbonated materials.

[0039] Specifically,

[0040] The bottom of the reflux groove is connected to the liquid outlet channel, and the notch of the reflux groove is connected to the pressure relief reflux chamber; the valve stem of the reflux valve 9 extends into the reflux groove, and the valve stem of the reflux valve 9 blocks or exposes the hole at the bottom of the reflux groove, thereby realizing the cutoff or conduction from the bottom of the groove to the notch in the reflux groove; thereby realizing the cutoff or conduction between the liquid outlet channel and the pressure relief reflux chamber.

[0041] The bottom of the pressure relief groove is connected to the return air channel, and the notch of the pressure relief groove is connected to the pressure relief reflux chamber; the valve stem of the pressure relief valve 10 extends into the pressure relief groove, and the valve stem of the pressure relief valve 10 blocks or exposes the hole at the bottom of the pressure relief groove, thereby realizing the cutoff or conduction from the bottom of the groove to the notch in the pressure relief groove; thereby realizing the cutoff or conduction between the return air channel and the pressure relief reflux chamber.

[0042] The bottom of the back pressure groove is connected to the return air channel, and the notch of the back pressure groove is connected to the back pressure chamber; the valve stem of the back pressure valve 11 extends into the back pressure groove, and the valve stem of the back pressure valve 11 blocks or exposes the hole at the bottom of the back pressure groove, thereby realizing the cutoff or conduction from the bottom of the groove to the notch in the back pressure groove; thereby realizing the cutoff or conduction between the return air channel and the back pressure chamber.

[0043] The back pressure chamber 23 and the pressure relief reflux chamber 24 are provided inside the filling valve mounting ring 25, and the back pressure groove, the pressure relief groove and the reflux groove are parallel to each other and arranged in sequence from top to bottom. This makes the valve body structure layout of this case more sophisticated and easier to implement than the prior art, and achieves the purpose of isobaric filling and hot filling with a simpler and more sophisticated structure.

[0044] The back pressure chamber 23 and the pressure relief reflux chamber 24 may also be arranged inside the valve body 26 or on other components fixedly connected to the filling valve mounting ring 25 .

[0045] The back pressure chamber 23 is connected to the upper part of the material cylinder 20 through a pipeline. To make the drawings clearer, the pipeline between the back pressure chamber and the material cylinder 20 is Figure 3It is not shown in the figure, the material cylinder 20 is used for isobaric filling, wherein the lower part contains the material 21 and the upper part contains the back pressure gas 22, so that the back pressure gas 22 can be kept injected into the back pressure chamber.

[0046] The pressure relief reflux chamber 24 is connected to the atmospheric pressure or the material bin through a pipe and a tee. To make the drawings clearer, the pipes between the material bin, the pressure relief reflux chamber 24 and the material bin are Figure 3 It is not shown in the figure, the material bin is used for hot filling, and it also has functions such as filtering and heating. In the hot filling process, during the filling interval, that is, when the filling is stopped, after the material enters the liquid outlet channel from the material bin, it can flow back through the reflux groove and the pressure relief reflux chamber 24, and after being processed by the material bin, it flows to the liquid outlet channel again, forming a cycle to avoid natural cooling of the material, thereby preventing the material from being contaminated by high temperature and having the effect of killing bacteria.

[0047] During pressure relief, the gas can be discharged outward through the pressure relief groove and the pressure relief reflux chamber 24 to complete the pressure relief.

[0048] The bottom of the valve stem 7 is conical, and a liquid valve sealing ring 5 is fixedly connected to the side wall of the bottom of the valve stem 7. In this way, when the bottom of the valve stem 7 is separated from the discharge hole for filling, Figure 2 As shown, the material can flow down from the center of the container in a column, not as Figure 1 As shown, the material flows down along the inner wall of the container, so that the material does not contact the tank mouth sealing ring, which can effectively prevent the material from sticking to the surface of the tank mouth sealing ring and polluting the mouth of the container. At the same time, the conical structural design can also play an effective role in stabilizing and guiding the flow.

[0049] Furthermore, the side surface of the cone is in the shape of an arc surface that is concave inward or convex outward, thereby effectively improving the flow stabilization and flow guidance effects.

[0050] Furthermore, the side surface of the cone is provided with a plurality of flow-guiding ridges arranged along its length direction, thereby further improving the flow stabilization and flow-guiding effects.

[0051] In addition, the inner wall of the discharge hole is in a conical shape that matches the bottom end of the valve stem 7 .

[0052] The discharge hole is located at the center of the tank mouth sealing sleeve 4.

[0053] People also found that the columnar flow of materials from the center of the container solved various problems during hot filling, but during isobaric filling, the materials fell directly to the bottom of the container instead of falling on the side wall of the container. Therefore, the columnar flow from the center would cause the gas-containing materials to directly impact the bottom of the container under the influence of gravity at the beginning of filling, which brought about the problem of gas contained in the materials being easy to precipitate at the beginning of filling, causing material gushing and difficulty in filling. That is, in the design process of dual-purpose canning valves, technical barriers that are difficult for technicians in this field to overcome have emerged.

[0054] At the same time, it is worth noting that even if the structure of controlling the liquid flow rate by controlling the return air speed in the traditional isobaric filling valve is adopted, it must be after the filling starts and the return air is generated that the resistance of gas outflow can be used to force the pressure in the container to be higher than the pressure in the back pressure chamber, so as to achieve the purpose of lowering the liquid flow rate; in the early stage of isobaric filling, at the moment when the liquid valve is opened, since the pressure in the container is equal to the pressure in the back pressure chamber, the liquid flow rate is still very fast, and therefore, it is still unable to overcome the above-mentioned technical barriers.

[0055] In response to the above-mentioned technical barriers, in this case, a slow filling valve as described below is set in the feed pipeline, through which two filling modes, fast filling or slow filling, can be realized. In this way, in the early stage of isobaric filling, due to the incompressibility of the liquid, when the liquid valve is opened, slow filling can be carried out immediately. Even if the pressure in the container is equal to the pressure in the back pressure chamber at this time, the slow filling valve can be used to control the slow outflow of the material, thereby avoiding the problem of gas precipitation and filling failure caused by impact and severe disturbance in the early stage of isobaric filling of carbonated beverages. Ultimately, the above-mentioned technical barriers can be effectively overcome.

[0056] After that, rapid filling is carried out until the liquid level reaches a certain level to ensure the filling efficiency. At this time, since there is liquid buffer at the bottom of the container, the liquid poured in is very stable. Therefore, during the rapid filling process, basically no bubbles can be seen below the liquid level.

[0057] The dual-purpose filling valve also includes a material pipe 19 and a slow filling valve 17. The material pipe 19 is connected to a material cylinder 20 for isobaric filling or a material bin for hot filling. The slow filling valve 17 is arranged in the material pipe 19 to control the area of ​​the internal flow channel. A flow meter 18 for monitoring the flow rate is also arranged on the material pipe 19. The slow filling valve for controlling the fast and slow filling of materials is installed on the material pipeline, rather than on the return air channel during filling (the filling flow rate is controlled by controlling the return air speed), so that the flow rate can be controlled more accurately during the first slow filling (if the return air speed is used to control the filling flow rate, when the filling just starts, the pressure in the container is not equal to the pressure of the material out of the filling nozzle, and the filling flow rate will be faster), so that the material can be effectively prevented from impacting the bottom of the bottle to produce a large amount of foam, or splashing and gas entrainment in the early stage of filling.

[0058] The slow filling valve 17 has a flow channel, a valve core extending into the flow channel, and a driving mechanism for driving the valve core to reciprocate, and the driving mechanism drives the valve core to block or expose the flow channel; a slow filling channel is provided on the valve core of the slow filling valve 17. In this way, when the slow filling valve 17 is opened, that is, when the valve core moves out of the flow channel, the internal flow channel area becomes larger, and if the liquid valve is opened at this time, the filling valve performs fast filling; when the slow filling valve 17 is closed, that is, when the valve core moves into the flow channel and blocks the flow channel, the material can only flow through the slow filling channel, that is, the internal flow channel area becomes smaller, and if the liquid valve is opened at this time, the filling valve performs slow filling.

[0059] The actions of the liquid valve cylinder 16, the slow filling valve 17, the back pressure valve 11, the pressure relief valve 10 and the reflux valve 9 are all controlled by the electrical control device.

[0060] The container 2 to be filled is located on the container support plate 1; the tank mouth sealing sleeve 4, the tank mouth sealing ring 3, the sliding sealing ring 6, the guide rod 8, and the roller 13 are combined into one body; when the filling machine rotates, the roller 13 rises along the cam 12 or descends along the cam 12 under the action of the pressing cylinder 15 (the pressing cylinder 15 is always pressed down, which is equivalent to a gas spring), driving the tank mouth sealing sleeve 4 to rise or fall.

[0061] The following is a detailed description of the processes of isobaric canning and heat pipe packaging.

[0062] The isobaric process is: filling the tank, air replacement, tank mouth sealing and back pressure, slow filling, fast filling, slow filling, static, pressure relief, tank mouth separation and tank exit. During the isobaric filling process, the reflux valve 9 is always closed.

[0063] The filling capacity of the can filling valve is controlled by a flow meter 18. When the material passing through the flow meter 18 reaches a set value, the electrical control system sends a signal to close the filling action.

[0064] , into the tank

[0065] Before filling, the liquid valve cylinder 16, the slow filling valve 17, the back pressure valve 11 and the pressure relief valve 10 are all closed, the piston of the liquid valve cylinder 16 is extended, and the liquid valve is closed.

[0066] When the filling valve rotates with the filling valve mounting ring 25, the roller 13 rises along the cam 12, driving the guide rod 8, the tank mouth sealing sleeve 4, the sliding sealing ring 6, and the tank mouth sealing ring 3 to rise together, and the container 2 is pushed onto the container support plate 1 by other mechanisms (not shown);

[0067] S2. Air replacement

[0068] The back pressure valve 11 is opened, and the back pressure gas in the back pressure chamber 23 is blown into the container 2 through the back pressure valve 11, the return air channel 29, and the annular nozzle 28, and the air in the container 2 is driven out from the annular gap between the mouth of the container 2 and the tank mouth sealing ring 3. When the set time is reached, the back pressure valve 11 is closed and the next step is entered;

[0069] When used to fill materials that are not sensitive to oxygen, this step can be skipped directly.

[0070] S3, tank mouth sealing and back pressure

[0071] When the filling machine continues to rotate, the roller 13 leaves the cam 12, and the guide rod 8 descends under the action of the downward pressure cylinder 15, driving the tank mouth sealing sleeve 4, the sliding sealing ring 6, and the tank mouth sealing ring 3 to descend together, so that the tank mouth sealing ring 3 is pressed tightly against the mouth of the container 2, so that a closed filling space is formed between the container 2 and the filling valve.

[0072] The back pressure valve 11 is opened again, and the back pressure gas in the back pressure chamber 23 enters the container 2 through the back pressure valve 11, the return air channel 29, and the annular nozzle 28; when the pressure in the container 2 is nearly equal to the pressure in the back pressure chamber 23, the next step is entered.

[0073] S4, slow filling

[0074] The liquid valve cylinder 16 opens, the piston retracts, the valve stem 7 rises under the action of the return spring 27, and the liquid valve opens; the material 21 flows down through the material pipe 19, the flow meter 18, and the slow filling valve 17 under the action of gravity, and flows into the annular channel formed between the valve body 26 and the valve stem 7; it flows into the interior of the container 2 in a columnar shape from the center of the container 2 through the liquid valve sealing ring 5; at the same time, the gas in the container 2 returns to the back pressure chamber 23 through the annular nozzle 28, the return air channel 29, and the back pressure valve 11.

[0075] Since the slow filling valve 17 is not opened and the channel area is small, slow filling is used at this time to prevent splashing and gas from being involved when the material impacts the bottom of the container 2. When the flow meter 18 measures that the filling volume reaches the first slow filling setting value, the next step is entered.

[0076] S5, fast filling

[0077] The slow filling valve 17 is opened, the channel area is enlarged, and it is fast filling at this time. When the flow meter 18 measures that the filling amount reaches the fast filling set value, the next step is entered.

[0078] S6, slow filling

[0079] The slow filling valve 17 is closed again, the channel area is reduced, and slow filling is performed again to improve the filling accuracy. When the flow meter 18 measures that the filling amount reaches the final set value, the next step is entered.

[0080] S7, Standstill

[0081] The liquid valve cylinder 16, the slow filling valve 17, and the back pressure valve 11 are closed, and the piston of the liquid valve cylinder 16 extends, driving the valve stem 7 to descend, and the liquid valve is closed; after the set static time, the next step is transferred.

[0082] S8, pressure relief

[0083] The pressure relief valve 10 is opened together. Since the flow area of ​​the pressure relief valve 10 is small, the gas above the material in the container 2 and the back pressure gas in the filling valve are slowly discharged into the pressure relief reflux chamber 24 through the annular nozzle 28, the return air channel 29, and the pressure relief chamber 10, so that the pressure in the container 2 drops to atmospheric pressure.

[0084] S9, can mouth detached, can out

[0085] When the filling valve rotates to the can discharge position on the filling machine, the roller 13 rises along the cam 12, driving the guide rod 8, the can mouth sealing sleeve 4, the sliding sealing ring 6, and the can mouth sealing ring 3 to rise together, and the can mouth sealing ring 3 is separated from the container 2. Finally, the filled container 2 is pushed away from the container support plate by other mechanisms not shown.

[0086] The isobaric filling process is completed.

[0087] The hot filling process is: entering the can, sealing the can mouth, slow filling, fast filling, slow filling, filling completion, can mouth detaching and exiting the can. During the hot filling process, the pressure relief valve 10 is always closed.

[0088] The filling capacity of the can filling valve is controlled by a flow meter 18. When the material passing through the flow meter 18 reaches a set value, the electrical control system sends a signal to close the filling action.

[0089] During hot filling, the pressure of the back pressure gas may be equal to the atmospheric pressure or slightly higher than the atmospheric pressure to prevent external gas from entering the material cylinder 20 .

[0090] When the filling machine is on standby or the filling valve lacks a small container, since material 21 is always flowing in the filling valve, the temperature of the filling valve will not drop due to heat dissipation.

[0091] T1. Tank entry

[0092] Before filling, the liquid valve cylinder 16, the slow filling valve 17, the back pressure valve 11, and the reflux valve 9 are all closed, the piston of the liquid valve cylinder 16 is extended, and the liquid valve is closed.

[0093] When the filling valve rotates with the filling valve mounting ring 25, the roller 13 rises along the cam 12, driving the guide rod 8, the tank mouth sealing sleeve 4, the sliding sealing ring 6, and the tank mouth sealing ring 3 to rise together, and the container 2 is pushed onto the container support plate 1 by other mechanisms not shown.

[0094] T2, tank mouth sealing

[0095] When the filling machine continues to rotate, the roller 13 leaves the cam 12, and the guide rod 8 descends under the action of the downward pressure cylinder 15, driving the tank mouth sealing sleeve 4, the sliding sealing ring 6, and the tank mouth sealing ring 3 to descend together, so that the tank mouth sealing ring 3 is pressed tightly against the mouth of the container 2, so that a closed filling space is formed between the container 2 and the filling valve.

[0096] T3, slow filling

[0097] The back pressure valve 11 opens, and the liquid inlet valve cylinder 16 opens, the piston retracts, the valve stem 7 rises under the action of the return spring 27, and the liquid valve opens; the material 21 flows down through the material pipe 19, the flow meter 18, and the slow filling valve 17 under the action of gravity, and flows down from the annular channel formed between the valve body 26 and the valve stem 7; it flows into the interior of the container 2 in a columnar shape from the center of the container 2 through the liquid valve sealing ring 5; at the same time, the gas in the container 2 returns to the back pressure chamber 23 through the annular nozzle 28, the return air channel 29, and the back pressure valve 11.

[0098] Since the slow filling valve 17 is not opened and the channel area is small, slow filling is used at this time to prevent splashing and gas from being involved when the material impacts the bottom of the container 2. When the flow meter 18 measures that the filling volume reaches the first slow filling setting value, the next step is entered.

[0099] T4, fast filling

[0100] The slow filling valve 17 is opened, the channel area is enlarged, and it is fast filling at this time. When the flow meter 18 measures that the filling amount reaches the fast filling set value, the next step is entered.

[0101] T5, slow filling

[0102] The slow filling valve 17 is closed again, the channel area is reduced, and slow filling is performed again to improve the filling accuracy. When the flow meter 18 measures that the filling amount reaches the final set value, the next step is entered.

[0103] T6, filling is finished

[0104] The liquid valve cylinder 16, the slow filling valve 17, and the back pressure valve 11 are closed, and the piston of the liquid valve cylinder 16 extends, driving the valve stem 7 to descend, and the liquid valve is closed.

[0105] T7, can mouth detached, can out

[0106] When the filling valve rotates to the can discharge position on the filling machine, the roller 13 rises along the cam 12, driving the guide rod 8, the can mouth sealing sleeve 4, the sliding sealing ring 6, and the can mouth sealing ring 3 to rise together, and the can mouth sealing ring 3 is separated from the container 2. Finally, the filled container 2 is pushed away from the container support plate by other mechanisms (not shown).

[0107] The hot filling process is finished.

[0108] There are many specific implementation ways of the present invention. The above is only the preferred implementation mode of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the present invention. These improvements should also be regarded as the protection scope of the present invention.

Claims

1. A dual-purpose filling valve, comprising a valve body (26) and a valve stem (7), wherein a liquid outlet channel is provided in the valve body (26), the valve stem (7) is arranged in the liquid outlet channel in a manner such that it can be raised or lowered, and the side wall of the valve stem (7) is sealed from the top of the liquid outlet channel, and a discharge hole at the bottom of the liquid outlet channel is exposed or blocked by the valve stem (7); It is characterized in that The dual-purpose filling valve further comprises a back pressure chamber (23) and a pressure relief reflux chamber (24); The valve body (26) is provided with an air return channel (29), and the bottom opening of the air return channel (29) is connected to the bottom of the valve body (26); A reflux groove, a pressure relief groove and a back pressure groove are provided on the outer wall of the valve body (26), and a reflux valve (9), a pressure relief valve (10) and a back pressure valve (11) are provided in the reflux groove, the pressure relief groove and the back pressure groove respectively; The liquid outlet channel is connected to the pressure relief reflux chamber (24) via a reflux valve (9), the air return channel (29) is connected to the pressure relief reflux chamber (24) via a pressure relief valve (10), and the air return channel (29) is also connected to the back pressure chamber (23) via a back pressure valve (11).

2. A dual-purpose filling valve according to claim 1, characterized in that: The back pressure chamber (23) is connected to the upper part of the material cylinder (20).

3. A dual-purpose filling valve according to claim 1, characterized in that: The pressure relief reflux chamber (24) is connected to atmospheric pressure or a material bin.

4. A dual-purpose filling valve according to claim 1, 2 or 3, characterized in that: The bottom of the valve stem (7) is conical.

5. A dual-purpose filling valve according to claim 1, 2 or 3, characterized in that: The discharge hole is located at the center of the tank mouth sealing sleeve (4).

6. A dual-purpose filling valve according to claim 1, 2 or 3, characterized in that: The dual-purpose filling valve further comprises a material pipe (19) and a slow filling valve (17); the material pipe (19) is connected to a material cylinder (20) for isobaric filling or a material bin for hot filling; the slow filling valve (17) is arranged in the material pipe (19) and is used to control the area of ​​the internal flow channel.

7. A dual-purpose filling valve according to claim 6, characterized in that: A slow filling channel is provided on the valve core of the slow filling valve (17).

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