A metering system

Abstract

The present invention relates to the technical field of jet pumps, and specifically discloses a metering system, which includes a liquid storage bin, a first heating component, a flow channel, a jet valve body, and a second heating component. The first heating component is sleeved outside the liquid storage bin; a nozzle is provided on the jet valve body, and the nozzle is connected to an opening at the other end of the flow channel; openings are respectively provided at both ends of the flow channel, one opening at one end thereof is communicated with the liquid storage bin, and the opening at the other end thereof is connected to the nozzle. The flow channel further includes a closing element; the second heating component is slidably sleeved outside the flow channel and the nozzle. In the metering system of the present invention, the liquid storage bin and the nozzle can be heated separately, and the second heating component is directly slidably sleeved on the flow channel to directly heat the flow channel and the nozzle, which is convenient for loading and unloading, has a good heating effect, and the temperature control is more accurate; the temperature difference between the medium to be metered and the nozzle can be reduced, thereby improving the metering accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of jet pumps, and particularly to a metering system. Background Art

[0002] In a metering system, it is required that the metering medium be liquid. When the medium to be metered is viscous or even close to a solid state, a temperature higher than room temperature is needed to turn it into a liquid. Usually, a heating element is added to the storage part of the metering system to heat the metering medium to turn it into a liquid before it is ejected. In addition, accurately controlling the temperature of the metering medium and having the temperature of the metering medium evenly distributed will result in more accurate metering effects.

[0003] At present, most metering systems use hot melt adhesive jet valves. However, the existing hot melt adhesive jet valves have the problems that on the one hand, the structure is complex, there are temperature differences in the liquid storage chamber, flow channel and nozzle, and the temperature distribution is uneven. Among them, the temperature difference between the medium in the liquid storage chamber and the nozzle of the existing hot melt adhesive jet valve in the prior art reaches 30 - 60 °C, which easily leads to inaccurate metering. On the other hand, the existing hot melt adhesive jet valves are difficult to disassemble and it is difficult to clean their interiors; in addition, heat will flow from the heating element into the jet valve body, causing heat loss of the nozzle, thereby reducing the nozzle temperature. Therefore, the temperature of the metering medium cannot reach a very high level, and the existing metering system can only provide a medium at a maximum temperature of 180 °C.

[0004] For example, Chinese Patent CN108906492B discloses a hot melt adhesive jet valve, which configures a first heating device for a hot melt adhesive tank. At the same time, a second heating device is provided for the flow channel of the dispensing valve. The second heating device can ensure that the hot melt adhesive can smoothly flow into the valve body without blocking the flow channel. However, this patent does not consider the temperature differences between the nozzle and the hot melt adhesive tank, flow channel and nozzle. If there are temperature differences between the nozzle and other parts of the dispensing valve, it may affect the metering accuracy.

[0005] For example, Chinese Patent CN111842024A provides a hot melt piezoelectric jet valve, which includes a first heating element and a second heating element. The first heating element is used to heat the liquid storage assembly, and the second heating element is used to heat the valve body assembly. The second heating element is sleeved outside the valve body, which is convenient for disassembly. However, this will increase the volume of the valve body, and it is also not convenient to disassemble and clean each component in contact with the dispensing medium separately. Summary of the Invention

[0006] The object of the present invention is to provide a metering system, which solves the problems of inaccurate metering and difficult disassembly and cleaning caused by the existing jet valves.

[0007] In order to solve the above technical problems, the present invention provides a dosing system, including a liquid storage tank, a first heating component, a flow channel, an injection valve body and a second heating component, wherein the first heating component is sleeved outside the liquid storage tank; a nozzle is provided on the injection valve body, and the nozzle is connected to an opening at the other end of the flow channel; openings are respectively provided at both ends of the flow channel, the opening at one end is connected to the liquid storage tank, and the opening at the other end is connected to the nozzle, and the flow channel also includes a closing element; the second heating component is slidably sleeved outside the flow channel and the nozzle.

[0008] Preferably, the metering system further comprises a third heating component, and the third heating component is installed in the injection valve body.

[0009] Preferably, the dosing system further comprises a frame.

[0010] Preferably, a receiving cavity is provided in the frame, the first heating component is installed on the inner wall of the receiving cavity, the liquid storage tank is installed in the receiving cavity, and the first heating component further includes a first temperature sensor.

[0011] Preferably, a top cover is provided on the top of the accommodating chamber, one end of the top cover is rotatably connected to the frame, and the other end is snap-connected to the frame; an air interface connected to the liquid storage tank is provided on the top cover.

[0012] Preferably, the injection valve body is mounted on the frame.

[0013] Preferably, the flow channel is installed on the bottom surface of the frame, and the frame extends downward with a protrusion, and the protrusion is provided with a slideway; the second heating component includes:

[0014] A slider, wherein the slider is provided with an insert block matched with the slideway, and the insert block can be slidably inserted into the slideway, so that the slider is sleeved outside the flow channel;

[0015] A heating element is installed in the slider, and the heating element also includes a second temperature sensor.

[0016] Preferably, a limiting column is provided on the protrusion; and the second heating assembly further comprises:

[0017] A pressing lever, one end of which is rotatably connected to the slider; a limiting block cooperating with the limiting column is provided on the pressing lever;

[0018] An unlocking lever, one end of which is rotatably mounted on the slider, and a resisting block is provided on the unlocking lever, and the resisting block is in resisting connection with the other end of the pressing lever;

[0019] Press the spring, one end of the pressing spring is in contact connection with the slider, and the other end is in contact connection with the pressing lever.

[0020] Preferably, the top end of the limit block is provided with an inclined surface structure that cooperates with the limit post.

[0021] Preferably, the unlocking lever is of an L-shaped structure.

[0022] Preferably, a heating port that cooperates with the nozzle is provided at the end of the slider.

[0023] Preferably, a first spring contact is provided on the bottom surface of the frame, and one end of the first spring contact is electrically connected to an external power supply; a second spring contact corresponding to the first spring contact is provided on the slider, one end of the second spring contact is in contact connection with the other end of the first spring contact, and the other end is electrically connected to the heating element and the second temperature sensor.

[0024] The present invention has the following beneficial effects:

[0025] (1) The present invention provides a first heating component and a second heating component to heat the liquid storage chamber, and also heat the flow channel and the nozzle; realizing that the liquid storage chamber and the nozzle / flow channel can be heated separately, and the purpose of having different temperatures for the medium to be metered in the nozzle and the liquid storage chamber can be achieved;

[0026] (2) The first heating component of the present invention is sleeved outside the liquid storage chamber, so that the temperature distribution of the medium to be metered in the liquid storage chamber is uniform. The second heating component heats the flow channel and the nozzle, and the temperature of the medium to be metered in the flow channel can be kept stable and uniformly distributed. Also, the temperature difference between the medium to be metered in the flow channel and the nozzle can be reduced. The temperature difference between the medium in the nozzle and the liquid storage chamber can be reduced to 12 °C or lower, improving the metering accuracy;

[0027] (3) The present invention may further include a third heating component to heat the injection valve body, avoiding heat loss from the flow channel and the nozzle to the injection valve body, ensuring that the temperature at the nozzle can reach a higher level, and the medium can be heated to a maximum of 270 °C; when the metering medium is a material with a higher melting point such as metal, the present invention can also reach a higher heating temperature;

[0028] (4) Each component of the present invention can be disassembled and cleaned, which is convenient and fast; moreover, the parts in contact with the medium (such as the flow channel including the nozzle and the closing element) do not have integrated electronic components, and each part can be very easily and quickly removed from the dispensing system, making it easier to clean, with a smaller risk of damage and reducing machine downtime. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of the metering system provided by the embodiment of the present invention;

[0030] Figure 2 is a sectional view of the metering system provided by an embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of the bottom surface structure of the frame provided by an embodiment of the present invention;

[0032] Figure 4 is a schematic diagram of the structure of the second heating assembly provided by an embodiment of the present invention;

[0033] Figure 5 is a schematic diagram of the internal structure of the second heating assembly provided by an embodiment of the present invention.

[0034] Reference numerals: 1, liquid storage tank; 2, first heating assembly; 3, flow channel; 4, injection valve body; 401, nozzle; 5, second heating assembly; 501, slider; 502, insertion block; 503, heating element; 504, pressing lever; 505, unlocking lever; 506, pressing spring; 507, limiting block; 6, frame; 7, top cover; 701, buckle; 702, air interface; 8, bump; 801, slideway; 802, limiting post; 9, first spring contact; 10, second spring contact. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0036] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0037] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0038] See Figure 1 and Figure 2 Referring to Figure 1 and Figure 2 , a preferred embodiment of the present invention provides a metering system, including a liquid storage tank 1, a first heating component 2, a flow channel 3, a spray valve body 4, and a second heating component 5. The first heating component 2 is sleeved outside the liquid storage tank 1; both ends of the flow channel 3 are provided with openings, one opening at one end is communicated with the liquid storage tank 1, and the opening at the other end is connected to the nozzle. The flow channel further includes a closing element, and the flow channel is installed in the spray valve body and connects the closing element to the actuating unit in the valve body; a nozzle 401 is provided on the spray valve body 4, and the nozzle 401 is connected to the opening at the other end of the flow channel 3; the second heating component 5 is slidably sleeved outside the flow channel 3 and the nozzle 401.

[0039] Based on the above solution, the working principle of the metering system according to the preferred embodiment of the present invention is as follows: The first heating component 2 heats the liquid storage tank 1, and the metering medium heated by the first heating component 2 flows into the flow channel 3 and is heated by the second heating component 5. At the same time, the second heating component 5 heats the flow channel 3 and the nozzle 401, and finally the medium is ejected from the nozzle 401.

[0040] It should be noted that the spray valve body 4 is provided with a closing element such as a firing pin, and the driving unit drives the closing element to move, so that the metering medium is ejected or flows out of the nozzle along the ejection direction. The driving unit can be a piezoelectric drive or a pneumatic drive. A cooling component is also provided inside the spray valve body 4 to cool the heat generated by the spray valve body 4. When the driving unit is a piezoelectric drive, the influence of high temperature on the service life of the piezoelectric stack can be reduced. Therefore, without affecting other components, the medium can be heated to a higher temperature; in addition, if the metering system is heated to a higher temperature (>>200 °C), the components in the spray valve body 4 may undergo thermal expansion and deformation, which will affect the stability and accuracy of the distribution. The system of the present invention is provided with an internal cooling component. Therefore, the thermal influence of the first heating component 2 and the second heating component 5 on the spray valve body 4 is small, and the distribution accuracy can be improved. At the same time, the first heating component 2 and the second heating component 5 also include temperature sensors to monitor the temperatures of the metering medium in the liquid storage tank and the nozzle respectively.

[0041] As a preferred solution, the metering system further includes a third heating component, which is installed inside the injection valve body. The third heating component heats the connection part between the injection valve body 4 and the flow channel 3, avoiding heat loss from the flow channel 3 and the nozzle 401 into the injection valve body 4, thereby reducing the temperature difference between the second heating component 5 and the nozzle 401, ensuring that the temperature at the nozzle can reach a higher level, and the medium can be heated up to 270 °C at most.

[0042] As a preferred solution, the metering system further includes a frame 6. Specifically, the frame 6 can protect each component, preventing internal components from being damaged.

[0043] As a preferred solution, a receiving cavity is formed inside the frame 6. The first heating component 2 is installed on the inner wall of the receiving cavity, and the liquid storage tank 1 is installed inside the receiving cavity. The first heating component further includes a first temperature sensor. Specifically, by providing the receiving cavity, the liquid storage tank 1 is isolated from the outside, ensuring the heating effect of the first heating component 2 and protecting the safety and heating effect of the liquid storage tank 1.

[0044] As a preferred solution, a top cover 7 is provided at the top of the receiving cavity. One end of the top cover 7 is rotatably connected to the frame 6, and the other end is snap-connected to the frame 6 by a snap 701; an air interface 702 communicating with the liquid storage tank 1 is provided on the top cover 7. Specifically, the snap 701 type top cover 7 can facilitate the management, replacement and maintenance of the liquid storage tank 1 inside the receiving cavity, greatly improving the simplicity.

[0045] As a preferred solution, the injection valve body 4 is installed on the frame 6.

[0046] See Figures 3 to 5 , as a preferred solution, the flow channel 3 is installed on the bottom surface of the frame 6, and the frame 6 extends downward with a convex block 8, and a slideway 801 is formed on the convex block 8; the second heating component 5 includes:

[0047] A slider 501, on which an insertion block 502 cooperating with the slideway 801 is provided. The insertion block 502 is slidably inserted into the slideway 801, so that the slider 501 is sleeved outside the flow channel 3;

[0048] A heating element 503 and a second temperature sensor, and the heating element 503 is installed inside the slider 501.

[0049] Specifically, the slider 501 can be slidably inserted into the slideway 801 through the insertion block 502, so that the slider 501 is fixed on the convex block 8 and sleeved outside the flow channel 3, realizing close heating of the flow channel 3 by the heating component and ensuring the heating effect; at the same time, it is also convenient for disassembly.

[0050] As a preferred solution, a limiting column 802 is provided on the protrusion 8; the second heating component 5 further includes:

[0051] A pressing lever 504, one end of which is rotatably connected to the slider 501; a limiting block 507 cooperating with the limiting column 802 is provided on the pressing lever 504;

[0052] An unlocking lever 505, one end of which is rotatably mounted on the slider 501, and a resisting block is provided on the unlocking lever 505, and the resisting block is in resisting connection with the other end of the pressing lever 504;

[0053] A pressing spring 506 , one end of which is in contact with the slider 501 , and the other end of which is in contact with the pressing lever 504 .

[0054] Specifically, when the slider 501 needs to be slid onto the protrusion 8, the unlocking lever 505 rotates downward, the abutment block presses the pressing lever 504, and the pressing lever 504 rotates downward with one end as the center to squeeze the pressing spring 506, and the limiting block moves downward with the pressing lever 504, and the inserting block 502 is inserted into the slideway 801 until the slider 501 is completely sleeved on the flow channel 3, the unlocking lever 505 is rotated upward, the abutment block releases the pressing lever 504, and the pressing lever 504 moves upward due to the elastic force of the pressing spring 506, and the limiting block 507 presses against the limiting column 802 to prevent the slider 501 from sliding, thereby fixing the slider 501 on the protrusion 8; similarly, when the slider 501 is to be slid out of the protrusion 8, it is only necessary to operate the unlocking lever 505. In addition, the second heating component 5 also has the effect of absorbing the pressure of the liquid storage tank 1 and preventing the flow channel 3 from deforming.

[0055] As a preferred solution, the top of the limit block 507 is provided with an inclined surface structure that cooperates with the limit column 802. Specifically, since the top of the limit block 507 is an inclined surface structure, when the slider 501 is slid into the system, the limit column 802 will slide along the limit block 507, so that the upward force of the spring will generate a horizontal component force, pushing the slider 501 toward the direction of the nozzle 401, so as to obtain the best heat transfer between the nozzle 401 and the heating element 503.

[0056] It is worth noting that the slide groove is horizontally arranged, so the slider 501 is also horizontally inserted into the protrusion 8.

[0057] As a preferred solution, the unlocking lever 505 is an L-shaped structure. Specifically, the unlocking lever 505 of the L-shaped structure is convenient for operators to operate.

[0058] As a preferred solution, a heating port cooperating with the nozzle is provided at the end of the slider 501. Specifically, the heating port half-wraps the nozzle, facilitating direct heating of the nozzle and achieving optimal heat transfer.

[0059] As a preferred solution, a first spring contact 9 (the first spring contact 9 includes a plurality of contact points) is provided on the bottom surface of the frame 6, and one end of the first spring contact 9 is electrically connected to an external power source; a second spring contact 10 corresponding to the first spring contact is provided on the slider 501, and one end of the second spring contact 10 is abutted and connected to the other end of the first spring contact 9, and the other end thereof is electrically connected to the heating element 503 and the second temperature sensor. Specifically, the first spring contact 9 and the second spring contact 10 can be electrically connected without the need for cable connection, which is convenient and fast, and can be automatically connected according to the sliding in of the slider 501, and automatically disconnected when sliding out, which is quick and easy to operate.

[0060] In summary, the preferred embodiment of the present invention provides a dosing system, which, compared with the prior art:

[0061] (1) The present invention is provided with a first heating component 2 and a second heating component 5 to heat the liquid storage tank 1, and also heat the flow channel 3 and the nozzle 401; the liquid storage tank 1 and the nozzle 401 / flow channel 3 can be heated separately, so that the nozzle 401 and the medium to be metered in the liquid storage tank 1 can have different temperatures;

[0062] (2) The first heating component 2 of the present invention is sleeved outside the liquid storage tank 1, so that the temperature of the medium to be dosed in the liquid storage tank 1 is evenly distributed. The second heating component 5 heats the flow channel 3 and the nozzle 401. The temperature of the medium to be dosed in the flow channel 3 can be kept stable and evenly distributed, and the temperature difference between the medium to be dosed in the flow channel 3 and the nozzle 401 can be reduced. The temperature difference can be reduced to 12° C. or lower between the nozzle 401 and the medium in the liquid storage tank 1, thereby improving the accuracy of dosing.

[0063] (3) The present invention may further include a third heating component to heat the injection valve body 4 to prevent the heat of the flow channel 3 and the nozzle 401 from being lost into the injection valve body 4, thereby ensuring that the temperature at the nozzle 401 can reach a higher temperature, and the medium can be heated to a maximum of 270° C. When the metered medium is a material with a higher melting point such as metal, the present invention can also achieve a higher heating temperature;

[0064] (4) The various components of the present invention can be disassembled and cleaned, which is convenient and quick; and the parts that come into contact with the medium (such as the flow channel 3 including the nozzle 401 and the closing element) have no integrated electronic components, so the various parts can be removed from the distribution system very easily and quickly, which is easier to clean, has a lower risk of damage, and reduces machine downtime.

[0065] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A metering system, characterized in that: include: Liquid storage tank; A first heating component, wherein the first heating component is sleeved outside the liquid storage bin; An injection valve body, wherein the injection valve body is provided with a nozzle, and the nozzle is connected to the opening at the other end of the flow channel; A flow channel, wherein both ends of the flow channel are respectively provided with openings, the opening at one end is communicated with the liquid storage bin, and the opening at the other end is connected with the nozzle, and the flow channel further comprises a closing element; A second heating component, the second heating component is slidably mounted outside the flow channel and the nozzle; The dosing system also includes a frame; The flow channel is installed on the bottom surface of the frame, and the frame extends downward with a protrusion, and the protrusion is provided with a slideway; the second heating component includes: A slider, wherein the slider is provided with an insert block matched with the slideway, and the insert block can be slidably inserted into the slideway, so that the slider is sleeved outside the flow channel; a heating element, the heating element being installed in the slider; The convex block is provided with a limiting column; the second heating assembly further comprises: A pressing lever, one end of which is rotatably connected to the slider; a limiting block cooperating with the limiting column is provided on the pressing lever; An unlocking lever, one end of which is rotatably mounted on the slider, and a resisting block is provided on the unlocking lever, and the resisting block is in resisting connection with the other end of the pressing lever; A pressing spring, one end of which is in contact with the slider and connected thereto, and the other end of which is in contact with the pressing lever and connected thereto.

2. The metering system according to claim 1, characterized in that: The metering system further comprises a third heating component which is installed in the injection valve body.

3. The metering system according to claim 1, characterized in that: A receiving cavity is provided in the frame, the first heating component is installed on the inner wall of the receiving cavity, the liquid storage tank is installed in the receiving cavity, and the first heating component also includes a first temperature sensor.

4. The metering system according to claim 3, characterized in that: A top cover is arranged on the top of the accommodating chamber, one end of the top cover is rotatably connected to the frame, and the other end is snap-connected to the frame; an air interface connected to the liquid storage tank is arranged on the top cover.

5. The metering system according to claim 1, characterized in that: The heating element also includes a second temperature sensor.

6. The metering system according to claim 1, wherein: The top end of the limiting block is provided with an inclined surface structure matched with the limiting column.

7. The metering system according to claim 1, characterized in that: The end of the sliding block is provided with a heating port matched with the nozzle.

8. The metering system according to any one of claims 1 to 7, characterized in that: A first spring contact is arranged on the bottom surface of the frame, and one end of the first spring contact is electrically connected to an external power supply; a second spring contact corresponding to the first spring contact is arranged on the slider, and one end of the second spring contact is abutted and connected to the other end of the first spring contact, and the other end thereof is electrically connected to the heating element and the second temperature sensor.

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