Aqueous coating production liquid additive dosing device

Abstract

The utility model relates to the technical fields of paint additive adds, especially a kind of water-based paint production liquid additive ration adding device, it is realized additive ration by setting overflow pipe backflow additive, eliminate the influence of air cushion layer in ration tank, and quantitative operation is more stable and accurate;Including ration tank and discharge pipe;Still including discharge box, feeding pipe, overflow pipe and backflow pipe, discharge box is located the outside of ration tank, and the inside of discharge box is provided with storage chamber, and discharge box is provided with feed pipe, the input end of feeding pipe is inserted into the storage chamber of discharge box, feeding pump is installed on feeding pipe, the output end of feeding pipe is inserted into the upper portion of the ration chamber of ration tank, overflow pipe is vertically installed in the ration chamber of discharge pipe, the lower end of overflow pipe is stretched out below the bottom of discharge pipe, the input end of backflow pipe is connected with the lower end of overflow pipe, and the output end of backflow pipe is inserted into the storage chamber of discharge box.

Description

Technical Field

[0001] This utility model relates to the technical field of coating additives, and in particular to a device for quantitatively adding liquid additives in the production of water-based coatings. Background Technology

[0002] In the production process of water-based coatings, liquid additives need to be added in a quantitative manner. Various liquid additive quantitative addition devices are disclosed in the prior art. For example, Chinese utility model patent CN220214577U proposes a coating additive addition device. This device includes a storage bottle, a servo motor fixedly connected to the top of the storage bottle, a rotating rod fixedly connected to the output end of the servo motor, and the bottom end of the rotating rod penetrating the inner side of the storage bottle. A stirring rod is fixedly connected to the outer wall of the bottom end of the rotating rod. A first connecting pipe is fixedly connected to the bottom end of the storage bottle, a quantitative bottle is fixedly connected to the bottom end of the first connecting pipe, and a mounting box is fixedly connected to the bottom end of the quantitative bottle. A second connecting pipe is fixedly connected to the bottom end of the mounting box. The servo motor drives the rotating rod to rotate, which in turn drives the stirring rod to rotate. The rotation of the stirring rod agitates the coating additives inside the storage bottle, preventing blockage of the additives inside the storage bottle, ensuring that the addition device can properly discharge the coating additives, and preventing inaccurate addition of the coating additives, making it convenient for operators to use.

[0003] However, the above-mentioned additive addition device uses a variable volume metering bottle as a metering tool. During operation, the metering space inside the metering bottle needs to be filled to complete the metering operation. This results in inaccurate metering if an air cushion layer is formed inside the metering bottle. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a device for quantitatively adding liquid additives in water-based coating production by setting an overflow pipe to return the additives, thereby eliminating the influence of the air cushion layer inside the metering tank and making the metering operation more stable and accurate.

[0005] This utility model discloses a quantitative addition device for liquid additives in water-based coating production, comprising a quantitative tank and a discharge pipe. The quantitative tank has a quantitative chamber inside, and a discharge pipe is installed at the bottom of the quantitative tank, communicating with the quantitative chamber. It also includes a discharge box, a feeding pipe, an overflow pipe, and a return pipe. The discharge box is located outside the quantitative tank, and a storage chamber is located inside the discharge box. An inlet pipe is installed on the discharge box, and the inlet end of the feeding pipe extends into the storage chamber of the discharge box. A feeding pump is installed on the feeding pipe, and the outlet end of the feeding pipe extends into the upper part of the quantitative chamber of the quantitative tank. The overflow pipe is vertically installed in the quantitative chamber of the discharge pipe, and its lower end extends below the bottom of the discharge pipe. The inlet end of the return pipe is connected to the lower end of the overflow pipe, and its outlet end extends into the storage chamber of the discharge box. During operation, the valve of the discharge pipe is closed, and the liquid is added through the inlet pipe to the discharge chamber. The additive is fed into the storage chamber of the material hopper. The feed pump operates to deliver the additive to the metering chamber of the metering tank through the feed pipe. As the additive is delivered, the liquid level of the additive in the metering chamber of the metering tank gradually rises. When the additive submerges the upper end of the overflow pipe, the additive overflows through the overflow pipe and the return pipe and flows back to the storage chamber of the discharge hopper. The feed pump is then stopped, and the metering of the additive is completed. The valve of the discharge pipe is opened to allow the additive to be discharged through the discharge pipe. By adjusting the height of the overflow pipe extending into the metering chamber of the metering tank, the metering amount of the additive can be adjusted. Compared with the existing technology that limits the liquid level of the additive in the metering tank by setting an overflow pipe to return the additive, thereby achieving metering, the metering amount can be adjusted by adjusting the height of the overflow pipe, thus eliminating the influence of the air cushion layer in the metering tank, making the metering operation more stable and accurate.

[0006] Preferably, it also includes a telescopic tube and a drive rod. The telescopic tube is provided between the return tube and the overflow tube. One end of the drive rod is connected to the overflow tube, and the other end of the drive rod is fixedly installed. The extension and retraction of the drive rod drives the overflow tube to rise and fall, thereby adjusting the height of the overflow tube extending into the metering chamber of the metering tank, thereby adjusting the metering size. When the overflow tube rises and falls, the telescopic tube extends and retracts adaptively, so that the overflow and return of the additives are smooth.

[0007] Preferably, it also includes an electrically controlled valve and an additive probe. The electrically controlled valve is installed on the feed pipe, and the additive probe is installed on the overflow pipe or return pipe. The probe of the additive probe extends into the interior of the return pipe, and the additive probe is electrically connected to the electrically controlled valve. The additive probe is used to detect whether there is additive overflow or return in the overflow pipe or return pipe. When the additive overflows or returns through the overflow pipe and return pipe, it is determined that the additive in the metering tank has been metered. The additive probe generates a signal, and the electrically controlled valve closes after receiving the signal. At the same time, the feed pump of the feed pipe is turned off, and the additive delivery is automatically stopped.

[0008] Preferably, it also includes a vent cap, which is installed on the discharge box and is connected to the top of the storage chamber of the discharge box; the vent cap connects the storage chamber of the discharge box to the outside atmosphere, facilitating feeding and discharging of the metering tank into the storage chamber.

[0009] Preferably, the system also includes an outer tube, an inner tube, a movable tube, and a push rod. The outer tube is installed in the metering chamber of the metering tank, with its upper end closed and a gap between its lower end and the bottom of the metering tank. The inner tube is installed inside the outer tube, with its lower end connected to the discharge pipe. The movable tube is slidably fitted onto the inner tube, and a wear-resistant sealing ring is provided between the movable tube and the inner tube. The fixed end of the push rod is installed on the metering tank, and the piston rod of the push rod is connected to the movable tube. A vacuum pipe is provided, communicating with the interior of the outer tube, to evacuate the interior of the outer tube to a certain degree of vacuum. The piston rod of the push rod extends or retracts, causing the upper end of the movable tube to be higher than the upper end of the overflow pipe. When the liquid level of the additive reaches the upper end of the overflow pipe and metering is completed, the piston rod of the push rod drives the movable tube to descend, causing the upper end of the movable tube to be lower than the overflow pipe. At the upper end of the tube, the upper end of the movable tube is lower than the additive liquid level, thus forming a communication between the space outside the outer tube, the space inside the outer tube, and the movable tube. This allows the additive inside the outer tube to be discharged through the movable tube, the inner tube, and the discharge pipe. Because the internal pressure of the outer tube is lower than the external pressure, a pressure difference is formed. Under the action of the pressure difference, the additive outside the outer tube enters the outer tube under the siphon effect and is discharged through the movable tube, the inner tube, and the discharge pipe. When the additive liquid level in the metering chamber of the metering tank is lower than the lower end of the outer tube, air enters the outer tube, balancing the pressure inside and outside the outer tube. The additive discharge automatically stops, and the additive inside the outer tube flows back into the metering chamber of the metering tank through the gap below, submerging the gap and facilitating the extraction of air from the outer tube again.

[0010] Preferably, it also includes an observation window, a light strip, and a liquid level sensor. A vertical observation window is provided on the outer wall of the metering tank, and the observation window is connected to the metering chamber of the metering tank. The light strip and the liquid level sensor are installed opposite each other on the inner walls of the observation window. The observation window has a transparent shell to facilitate observation of the inside of the metering tank. When the light strip is turned on, it illuminates the additives inside the observation window, thereby highlighting the additives inside the observation window for easy observation of the liquid level. The liquid level sensor facilitates monitoring of the additive liquid level and sends the liquid level information to the control system for easy information collection and processing.

[0011] Preferably, it also includes an inflation tube and a pressure probe. The inflation tube is installed on the metering tank and is connected to the metering chamber of the metering tank. The pressure probe is installed on the metering tank and its probe extends into the metering chamber of the metering tank. The inflation tube is connected to an external high-pressure air system and delivers high-pressure air to the metering chamber of the metering tank through the inflation tube, thereby increasing the pressure on the outer wall of the outer tube, further increasing the pressure difference between the inside and outside of the outer tube, improving the efficiency of additive discharge, and monitoring the pressure through the pressure probe.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting an overflow pipe to return the auxiliary agent, the liquid level of the auxiliary agent in the metering tank is limited, thereby realizing the metering of the auxiliary agent. The metering size can be adjusted by adjusting the height of the overflow pipe, thereby eliminating the influence of the air cushion layer in the metering tank, and the metering operation is more stable and accurate. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial cross-sectional view of the present invention. Figure 3 This is a schematic diagram of the isometric structure of this utility model; Figure 4 This is a partial cross-sectional structural diagram of a metering tank or similar structure. Figure 5 It is a partial cross-sectional structural diagram of structures such as the discharge box.

[0014] The following are labels in the attached diagram: 1. Metering tank; 2. Discharge pipe; 3. Discharge box; 4. Feeding pipe; 5. Overflow pipe; 6. Return pipe; 7. Telescopic pipe; 8. Drive rod; 9. Electrically controlled valve; 10. Additive probe; 11. Vent cap; 12. Outer pipe; 13. Inner pipe; 14. Movable pipe; 15. Push rod; 16. Observation window; 17. Light strip; 18. Liquid level sensor; 19. Air filling pipe; 20. Pressure probe. Detailed Implementation

[0015] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example 1

[0016] like Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, a device for quantitatively adding liquid additives in the production of water-based coatings includes a metering tank 1 and a discharge pipe 2. The metering tank 1 has a metering chamber inside, and the discharge pipe 2 is installed at the bottom of the metering tank 1, communicating with the metering chamber. It also includes a discharge box 3, a feeding pipe 4, an overflow pipe 5, and a return pipe 6. The discharge box 3 is located outside the metering tank 1, and a storage chamber is located inside the discharge box 3. An inlet pipe is installed on the discharge box 3. The inlet end of the feeding pipe 4 extends into the storage chamber of the discharge box 3, and a feeding pump is installed on the feeding pipe 4. The outlet end of the feeding pipe 4 extends into the upper part of the metering chamber of the metering tank 1. The overflow pipe 5 is vertically installed in the metering chamber of the discharge pipe 2, and its lower end extends out of the bottom of the discharge pipe 2. Below, the input end of the return pipe 6 is connected to the lower end of the overflow pipe 5, and the output end of the return pipe 6 extends into the storage chamber of the discharge box 3; it also includes a telescopic pipe 7 and a drive rod 8, with the telescopic pipe 7 installed between the return pipe 6 and the overflow pipe 5, one end of the drive rod 8 connected to the overflow pipe 5, and the other end of the drive rod 8 fixedly installed; it also includes an electric control valve 9 and an additive probe 10, with the electric control valve 9 installed on the feeding pipe 4, and the additive probe 10 installed on the overflow pipe 5 or the return pipe 6, the probe of the additive probe 10 extending into the interior of the return pipe 6, and the additive probe 10 electrically connected to the electric control valve 9; it also includes a vent cap 11, which is installed on the discharge box 3 and communicates with the top of the storage chamber of the discharge box 3.

[0017] During operation, the drive rod 8 extends and retracts, causing the overflow pipe 5 to rise and fall, thereby adjusting the height of the overflow pipe 5 extending into the metering chamber of the metering tank 1, thus adjusting the metering amount. As the overflow pipe 5 rises and falls, the telescopic pipe 7 extends and retracts accordingly, ensuring smooth overflow and return of the additive. The valve of the discharge pipe 2 is closed, and the additive is fed into the storage chamber of the discharge box 3 through the feed pipe. The storage chamber of the discharge box 3 is connected to the outside atmosphere through the vent cap 11, facilitating feeding and discharging into the storage chamber of the metering tank 1. The feed pump operates, delivering the additive into the metering chamber of the metering tank 1 through the feed pipe 4. As the additive is delivered, the liquid level of the additive in the metering chamber of the metering tank 1 gradually rises. When the additive submerges the upper end of the overflow pipe 5, the additive overflows through the overflow pipe 5 and the return pipe 6 and returns to the storage chamber of the discharge box 3. The additive probe 10 is used for detection. The overflow pipe 5 or return pipe 6 is checked for overflow and return of the additive. When the additive overflows or returns through the overflow pipe 5 and return pipe 6, it is determined that the additive in the metering tank 1 has been metered. The additive probe 10 generates a signal, and the electric control valve 9 closes after receiving the signal. At the same time, the feed pump of the feed pipe 4 is turned off, and the additive delivery is automatically stopped. At this time, the metering of the additive is completed. The valve of the discharge pipe 2 is opened to allow the additive to be discharged through the discharge pipe 2. By adjusting the height of the overflow pipe 5 extending into the metering chamber of the metering tank 1, the metering amount of the additive can be adjusted. Compared with the existing technology that sets the overflow pipe 5 to return the additive and limit the liquid level of the additive in the metering tank 1, thereby achieving the metering of the additive, the metering amount can be adjusted by adjusting the height of the overflow pipe 5, thus eliminating the influence of the air cushion layer in the metering tank 1, and the metering operation is more stable and accurate. Example 2

[0018] like Figure 1 and Figure 4 As shown, based on Embodiment 1, it further includes an outer tube 12, an inner tube 13, a movable tube 14, and a push rod 15. The outer tube 12 is installed in the metering chamber of the metering tank 1, with its upper end closed and a gap provided between its lower end and the bottom of the metering tank 1. The inner tube 13 is installed inside the outer tube 12, with its lower end connected to the discharge pipe 2. The movable tube 14 is slidably fitted onto the inner tube 13, and a wear-resistant sealing ring is provided between the movable tube 14 and the inner tube 13. The fixed end of the push rod 15 is installed on the metering tank 1, and the piston rod of the push rod 15 is connected to the movable tube 14. It also includes an inflation tube 19 and a pressure probe 20. The inflation tube 19 is installed on the metering tank 1 and communicates with the metering chamber of the metering tank 1. The pressure probe 20 is installed on the metering tank 1, and its probe extends into the metering chamber of the metering tank 1.

[0019] The inflation pipe 19 is connected to an external high-pressure air system, supplying high-pressure air to the metering chamber of the metering tank 1 through the inflation pipe 19. This increases the pressure on the outer wall of the outer pipe 12, further increasing the pressure difference between the inside and outside of the outer pipe 12, thus improving the efficiency of additive discharge. The pressure is monitored by a pressure probe 20. A suction pipe is connected to the inside of the outer pipe 12, evacuating the inside of the outer pipe 12 to a certain degree of vacuum. The piston rod of the push rod 15 extends and retracts, causing the upper end of the movable pipe 14 to be higher than the upper end of the overflow pipe 5. When the liquid level of the additive reaches the upper end of the overflow pipe 5 and the metering is completed, the piston rod of the push rod 15 drives the movable pipe 14 to descend, causing the upper end of the movable pipe 14 to be lower than the upper end of the overflow pipe 5. At this time, the upper end of the movable pipe 14 is lower than the liquid level of the additive, thereby making the outer pipe 12... The external space, the internal space of the outer tube 12, and the movable tube 14 form a communication device, allowing the additive inside the outer tube 12 to be discharged through the movable tube 14, the inner tube 13, and the discharge tube 2. Since the internal pressure of the outer tube 12 is lower than the external pressure of the outer tube 12, a pressure difference is formed. Under the action of the pressure difference, the additive outside the outer tube 12 enters the outer tube 12 under the siphon effect and is discharged through the movable tube 14, the inner tube 13, and the discharge tube 2. When the additive liquid level in the metering chamber of the metering tank 1 is lower than the lower end of the outer tube 12, air enters the outer tube 12, making the pressure inside and outside the outer tube 12 equal, and the additive automatically stops discharging. The additive inside the outer tube 12 flows back into the metering chamber of the metering tank 1 through the gap below, submerging the gap, which facilitates the extraction of air from the outer tube 12 again. Example 3

[0020] like Figure 2 , Figure 3 and Figure 4 As shown, based on Embodiment 1, it also includes an observation window 16, a light strip 17, and a liquid level sensor 18. A vertical observation window 16 is provided on the outer wall of the metering tank 1, and the observation window 16 is connected to the metering chamber of the metering tank 1. The light strip 17 and the liquid level sensor 18 are installed opposite each other on the inner walls of the two sides of the observation window 16. The observation window 16 is provided with a transparent shell to facilitate observation of the inside of the metering tank 1. The light strip 17 is turned on to illuminate the additives inside the observation window 16, thereby highlighting the additives inside the observation window 16 to facilitate observation of the liquid level. The liquid level sensor 18 is provided to facilitate monitoring of the additive liquid level. The liquid level sensor 18 sends the liquid level information to the control system to facilitate information collection and processing.

[0021] like Figures 1 to 5As shown, this utility model discloses a device for quantitatively adding liquid additives in the production of water-based coatings. During operation, the height of the overflow pipe 5 extending into the quantitative chamber of the quantitative tank 1 is first adjusted to regulate the quantitative amount. The valve of the discharge pipe 2 is closed, and the additive is fed into the storage chamber of the discharge box 3 through the inlet pipe. Then, the feed pump operates, conveying the additive into the quantitative chamber of the quantitative tank 1 through the feed pipe 4. As the additive is conveyed, the liquid level of the additive in the quantitative chamber of the quantitative tank 1 gradually rises. When the additive submerges the upper end of the overflow pipe 5, the additive overflows through the overflow pipe 5 and the return pipe 6 and flows back into the storage chamber of the discharge box 3. The additive probe 10 generates a signal, and the solenoid valve 9 closes upon receiving the signal. Simultaneously, the feed pump of the feed pipe 4 is shut off, completing the quantitative addition of the additive. Then, the discharge pipe 2 is opened. The valve, push rod 15, and piston rod drive movable tube 14 to descend, so that the upper end of movable tube 14 is lower than the upper end of overflow tube 5. At this time, the upper end of movable tube 14 is lower than the additive liquid level, so that the space outside the outer tube 12, the space inside the outer tube 12, and movable tube 14 form a communication device. The additive outside the outer tube 12 enters the interior of the outer tube 12 under the siphon effect and is discharged through movable tube 14, inner tube 13, and discharge tube 2. When the additive liquid level in the metering chamber of metering tank 1 is lower than the lower end of outer tube 12, air enters the interior of outer tube 12, so that the pressure inside and outside the outer tube 12 is balanced, and the additive automatically stops discharging. Finally, the additive inside the outer tube 12 flows back into the metering chamber of metering tank 1 through the gap below, submerging the gap, so that the air inside the outer tube 12 can be extracted again.

[0022] The main functions achieved by this utility model are: 1. By setting an overflow pipe 5 to return the additive, the liquid level of the additive in the metering tank 1 is limited, thereby achieving metering of the additive; 2. The metering volume can be adjusted by adjusting the height of the overflow pipe 5; 3. The influence of the air cushion layer inside the metering tank 1 has been eliminated, making the metering operation more stable and accurate; 4. It can automatically stop the discharge of additives.

[0023] This utility model discloses a quantitative addition device for liquid additives in water-based coating production. Its installation, connection, and setup methods are all common mechanical methods, and any method that achieves the desired beneficial effect can be implemented. The quantitative tank 1, discharge pipe 2, discharge box 3, feeding pipe 4, overflow pipe 5, return pipe 6, telescopic pipe 7, drive rod 8, electric control valve 9, additive probe 10, vent cap 11, push rod 15, observation window 16, light strip 17, liquid level sensor 18, air filling pipe 19, and pressure probe 20 of this device are commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative effort from those skilled in the art.

[0024] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A device for quantitatively adding liquid additives in the production of water-based coatings, comprising a metering tank (1) and a discharge pipe (2), wherein a metering chamber is provided inside the metering tank (1), and the discharge pipe (2) is installed at the bottom of the metering tank (1), and the discharge pipe (2) is connected to the metering chamber; characterized in that, It also includes a discharge box (3), a feeding pipe (4), an overflow pipe (5), and a return pipe (6). The discharge box (3) is located outside the metering tank (1). The discharge box (3) is equipped with a storage chamber. The discharge box (3) is equipped with a feed pipe. The input end of the feeding pipe (4) extends into the storage chamber of the discharge box (3). A feeding pump is installed on the feeding pipe (4). The output end of the feeding pipe (4) extends into the upper part of the metering chamber of the metering tank (1). The overflow pipe (5) is installed vertically in the metering chamber of the discharge pipe (2). The lower end of the overflow pipe (5) extends below the bottom of the discharge pipe (2). The input end of the return pipe (6) is connected to the lower end of the overflow pipe (5). The output end of the return pipe (6) extends into the storage chamber of the discharge box (3).

2. The device for quantitatively adding liquid additives in the production of water-based coatings as described in claim 1, characterized in that, It also includes a telescopic pipe (7) and a drive rod (8). The telescopic pipe (7) is set between the return pipe (6) and the overflow pipe (5). One end of the drive rod (8) is connected to the overflow pipe (5), and the other end of the drive rod (8) is fixedly set.

3. The device for quantitatively adding liquid additives in water-based coating production as described in claim 1, characterized in that, It also includes an electric control valve (9) and an additive probe (10). The electric control valve (9) is installed on the feed pipe (4), and the additive probe (10) is installed on the overflow pipe (5) or the return pipe (6). The probe of the additive probe (10) extends into the interior of the return pipe (6), and the additive probe (10) is electrically connected to the electric control valve (9).

4. The device for quantitatively adding liquid additives in water-based coating production as described in claim 1, characterized in that, It also includes a vent cap (11), which is installed on the discharge box (3) and is connected to the top of the storage chamber of the discharge box (3).

5. The device for quantitatively adding liquid additives in water-based coating production as described in claim 1, characterized in that, It also includes an outer tube (12), an inner tube (13), a movable tube (14), and a push rod (15). The outer tube (12) is installed in the metering chamber of the metering tank (1). The upper end of the outer tube (12) is closed, and a gap is set between the lower end of the outer tube (12) and the bottom of the metering tank (1). The inner tube (13) is installed inside the outer tube (12). The lower end of the inner tube (13) is connected to the discharge pipe (2). The movable tube (14) is slidably fitted on the inner tube (13). A wear-resistant sealing ring is set between the movable tube (14) and the inner tube (13). The fixed end of the push rod (15) is installed on the metering tank (1), and the piston rod of the push rod (15) is connected to the movable tube (14).

6. The device for quantitatively adding liquid additives in the production of water-based coatings as described in claim 1, characterized in that, It also includes an observation window (16), a light strip (17) and a liquid level sensor (18). A vertical observation window (16) is provided on the outer wall of the metering tank (1). The observation window (16) is connected to the metering chamber of the metering tank (1). The light strip (17) and the liquid level sensor (18) are installed on the inner walls of the two sides of the observation window (16).

7. The device for quantitatively adding liquid additives in the production of water-based coatings as described in claim 5, characterized in that, It also includes an inflation tube (19) and a pressure probe (20). The inflation tube (19) is installed on the metering tank (1) and is connected to the metering chamber of the metering tank (1). The pressure probe (20) is installed on the metering tank (1) and the probe of the pressure probe (20) extends into the metering chamber of the metering tank (1).

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