Mechanical pressure compensation device for a loss-in-weight scale

Abstract

This utility model discloses a mechanical pressure compensation device for a loss-in-weight scale, including a loss-in-weight scale, a receiving reactor, a loss-in-weight scale discharge pipe, and a pneumatic sealing valve. The loss-in-weight scale has a feed inlet at the top and a discharge port connecting flange at the bottom. The receiving reactor has a feed inlet, and a receiving reactor inlet connecting flange is also provided at the feed inlet. One end of the loss-in-weight scale discharge pipe is fixedly connected to the discharge port connecting flange at the bottom of the loss-in-weight scale, and the other end passes through the receiving reactor inlet connecting flange and connects to the inside of the receiving reactor inlet. A radial gap exists between the outer wall of the loss-in-weight scale discharge pipe and the inner hole of the receiving reactor inlet. A flexible discharge connector provides a sealed connection between the loss-in-weight scale discharge port connecting flange and the receiving reactor inlet connecting flange. This device compensates for pressure fluctuations within the reactor, improving the stability and weighing accuracy of the material conveying process.

Description

Technical Field

[0001] This utility model belongs to the field of loss-in-weight scales and relates to a mechanical pressure compensation device for loss-in-weight scales. Background Technology

[0002] In the production fields of fine chemicals, food, and pharmaceuticals, loss-in-weight scales serve as core material metering devices, achieving precise feeding control by continuously monitoring changes in the weight of the conveyed materials. However, when loss-in-weight scales are used in conjunction with closed reaction vessels, the intense physicochemical reactions within the reaction system (such as venting, expansion, or phase transitions) can cause pressure oscillations within the reaction vessel, and due to process safety limitations, pressure relief through venting is not possible. These pressure disturbances act on the elastic body of the load cell via a mechanical transmission path, causing drift in its output signal, resulting in measurement data deviations, and severely compromising the quality control stability and metering accuracy of the loss-in-weight scale. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a mechanical pressure compensation device for a loss-in-weight scale, thereby compensating for pressure fluctuations inside the reactor and improving the stability and weighing accuracy of the material conveying process.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A mechanical pressure compensation device for a loss-in-weight scale includes a loss-in-weight scale, a receiving reactor, a loss-in-weight scale discharge pipe, and a pneumatic sealing valve. The loss-in-weight scale is equipped with a loss-in-weight scale inlet at the top and a discharge outlet at the bottom. The discharge outlet is equipped with a loss-in-weight scale discharge outlet connecting flange. The receiving reactor is equipped with a receiving reactor inlet, and the receiving reactor inlet is equipped with a receiving reactor inlet connecting flange. One end of the loss-in-weight scale discharge pipe is fixedly connected to the loss-in-weight scale discharge port connecting flange at the bottom of the loss-in-weight scale, and the other end passes through the receiving reactor inlet connecting flange and connects to the inside of the receiving reactor inlet; there is a radial gap between the outer wall of the loss-in-weight scale discharge pipe and the inner hole of the receiving reactor inlet; a discharge flexible connection is used to seal the connection between the loss-in-weight scale discharge port connecting flange and the receiving reactor inlet connecting flange.

[0005] Preferably, the loss-in-weight scale is equipped with a loss-in-weight scale discharge screw.

[0006] Preferably, the discharge screw of the loss-in-weight scale is located inside the discharge pipe of the loss-in-weight scale.

[0007] Preferably, the feed inlet of the loss-in-weight scale is connected to a pneumatic sealing valve.

[0008] Preferably, the feed inlet of the loss-in-weight scale is connected to the feed valve via a feed flexible connector.

[0009] Preferably, the loss-in-weight scale is provided with a support base at the bottom, and the loss-in-weight scale is installed on the support base.

[0010] Preferably, the loss-in-weight scale is mounted on a support base via a load cell.

[0011] Preferably, the receiving reactor inlet flange is located at the top of the receiving reactor.

[0012] Preferably, the receiving reactor inlet flange is located on the side wall of the receiving reactor.

[0013] Preferably, the discharge flexible connector is made of a flexible and pressure-resistant material.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention effectively compensates for installation errors, vibrations, and thermal expansion and contraction caused by temperature differences between equipment by employing flexible connections and reserved gaps, protecting the weighing system and improving the adaptability of the entire device to different site layouts. By constructing a pressure self-balancing chamber, the interference problem of weighing signals caused by pressure fluctuations in the reactor is fundamentally solved, enabling the loss-in-weight scale to maintain extremely high measurement accuracy and stability even under harsh operating conditions such as closed environments, high pressure, and unstable pressure. The overall solution uses a purely mechanical structure for compensation, without additional active control units or complex sensing devices, resulting in a simple structure, stable and reliable operation, and minimal maintenance requirements. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the mechanical pressure compensation device of the loss-in-weight scale of this utility model. Figure 2 This is a schematic diagram of the loss-in-weight scale of this utility model; Figure 3 This is a schematic diagram of the feed inlet section of the receiving reactor of this utility model; Figure 4 This is a schematic diagram of the structure of the loss-in-weight scale and the receiving reaction vessel installation part of this utility model.

[0016] Wherein: 1, Loss-in-weight balance; 1-1, Loss-in-weight balance inlet; 1-2, Loss-in-weight balance outlet connecting flange; 1-3, Loss-in-weight balance outlet pipe; 1-4, Loss-in-weight balance outlet screw; 2, Support base; 3, Receiving reactor; 3-1, Receiving reactor inlet connecting flange; 3-2, Receiving reactor inlet; 4, Pressure sealing valve; 5, Feeding flexible connection; 6, Feeding valve; 7, Discharge flexible connection. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] Unless otherwise defined, 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 terms “installation,” “connection,” and “linkage” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; a mechanical connection, an electrical connection, or a connection that allows communication; a direct connection or an indirect connection via an intermediate medium; or a connection within two elements or an interaction between two elements. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0022] like Figure 1 and Figure 4 As shown, this utility model discloses a mechanical pressure compensation device for a loss-in-weight scale, which structurally includes a loss-in-weight scale 1, a support base 2, and a receiving reactor 3. The scale body of the loss-in-weight scale 1 is mounted on the support base 2 via a load cell (not shown), forming an independent weighing unit.

[0023] The key feature of this invention lies in the connection structure between the loss-in-weight balance 1 and the receiving reactor 3: like Figure 1 and Figure 2 As shown, at the feed end of the loss-in-weight scale 1, its feed inlet 1-1 is connected to a pneumatic sealing valve 4. This pneumatic sealing valve 4 can reliably close when the loss-in-weight scale 1 performs feeding operations, thereby isolating the internal cavity of the loss-in-weight scale 1 from the upstream feeding pipeline and the external atmospheric environment, forming a sealed space.

[0024] like Figure 3 and 4 As shown, at the discharge end of the loss-in-weight scale 1, a loss-in-weight scale discharge pipe 1-3 is fixedly connected to the discharge port connecting flange 1-2. The discharge pipe 1-3 extends outward and passes through the receiving reactor inlet connecting flange 3-1, extending into the receiving reactor inlet 3-2. The loss-in-weight scale discharge screw 1-4, used for conveying materials, is enclosed within the discharge pipe 1-3, and its discharge end also extends into the reactor 3.

[0025] The outer wall of the loss-in-weight balance discharge pipe 1-3 maintains a specific, non-contact radial clearance between it and the inner hole of the receiving reactor inlet flange 3-1 and the receiving reactor inlet 3-2. This design ensures that there is no rigid mechanical contact between the loss-in-weight balance discharge pipe and the receiving reactor body.

[0026] The discharge port flange 1-2 of the loss-in-weight scale and the inlet flange 3-1 of the receiving reactor are sealed together by a flexible discharge connector 7. This flexible discharge connector 7 is made of a flexible pressure-resistant material and serves two purposes: first, to seal the connection and prevent material leakage or intrusion of external gases; and second, to completely isolate the vibration transmission and rigid stress between the two components using its flexibility.

[0027] The pressure compensation principle of this utility model device in actual operation is as follows: When the loss-in-weight balance 1 feeds material into the receiving reactor 3, the air pressure sealing valve 4 at the inlet is closed, and the inside of the loss-in-weight balance 1 is a sealed chamber. At this time, if the receiving reactor 3 experiences pressure fluctuations due to internal chemical reactions or other reasons, these pressure fluctuations will be transmitted in reverse through the material channel and the outlet pipes 1-3 of the loss-in-weight balance to the sealed inner cavity of the entire loss-in-weight balance 1, ensuring that the pressure inside the balance and the pressure inside the reactor remain consistent in real time.

[0028] Based on the principle of pressure action, this fluctuating pressure will act evenly on all the inner surfaces of the loss-in-weight scale 1. Specifically, the pressure acting on the top surface of the scale's inner cavity will generate a downward force, while the pressure acting on the bottom surface of the scale's inner cavity, including the projected area of ​​the discharge pipe within the scale, will generate an upward force of equal magnitude but opposite direction. Since the entire loss-in-weight scale 1 is weighed as a whole, these two opposing forces cancel each other out inside the scale, and their resultant force is zero. Therefore, the pressure fluctuations in the reactor will not generate any additional net torque or vertical load on the weighing sensor, and the value measured by the weighing sensor is always only the real-time weight of the material inside the scale. In this way, a passive, mechanical "self-balancing" of pressure is achieved through structural design, thereby achieving the purpose of compensating for pressure fluctuations.

[0029] As a preferred option, the feed inlet 1-1 of the loss-in-weight scale can be connected to the upstream feed valve 6 via a flexible feed connector 5 to absorb vibrations and installation displacements in the upstream pipeline, further ensuring the stability of the weighing environment. During the replenishment operation, the control system feeds materials in the order of "opening the pneumatic sealing valve 4 first, then opening the feed valve 6," and stops in the order of "closing the feed valve 6 first, then closing the pneumatic sealing valve 4," ensuring the sealing and reliability of the replenishment process.

[0030] In addition, the receiving reactor inlet connection flange 3-1 can be flexibly set on the top or side wall of the reactor 3 according to the needs of the process layout, without affecting the realization of the pressure compensation function of this utility model, and has good on-site applicability.

[0031] This invention fundamentally solves the problem of interference with the weighing signal caused by pressure fluctuations in the reactor by constructing a pressure self-balancing chamber, enabling the loss-in-weight scale to maintain extremely high measurement accuracy and stability even under harsh working conditions such as closed, high-pressure, and unstable pressure.

[0032] This solution does not alter the main structure of the loss-in-weight scale; it only optimizes the discharge connection, making it compatible with various commercially available loss-in-weight scales and highly versatile. It is also very convenient for retrofitting existing production lines with low investment costs.

[0033] The overall solution uses a purely mechanical structure to achieve compensation, without additional active control units or complex sensing devices. It has a simple structure, stable and reliable operation, and requires minimal maintenance.

[0034] By adopting a flexible connection and reserved gap design, the installation error, vibration and thermal expansion and contraction caused by temperature difference between equipment are effectively compensated, the weighing system is protected and the adaptability of the whole set of equipment to different site layouts is improved.

[0035] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0036] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0037] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0038] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0039] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

[0040] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this patent should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed utility model subject matter.

Claims

1. A mechanical pressure compensation device for a loss-in-weight scale, characterized in that, It includes a loss-in-weight balance (1), a receiving reactor (3), a loss-in-weight balance discharge pipe (1-3), and a pressure sealing valve (4). The loss-in-weight scale (1) is provided with a loss-in-weight scale inlet (1-1) at the top and a discharge outlet at the bottom. The discharge outlet is provided with a loss-in-weight scale discharge outlet connecting flange (1-2). The receiving reactor (3) is provided with a receiving reactor inlet (3-2). The receiving reactor inlet (3-2) is provided with a receiving reactor inlet connecting flange (3-1). One end of the loss-in-weight scale discharge pipe (1-3) is fixedly connected to the loss-in-weight scale discharge port connecting flange (1-2) at the bottom of the loss-in-weight scale (1), and the other end passes through the receiving reactor inlet connecting flange (3-1) and connects to the inside of the receiving reactor inlet (3-2) of the receiving reactor (3); there is a radial gap between the outer wall of the loss-in-weight scale discharge pipe (1-3) and the inner hole of the receiving reactor inlet (3-2); a discharge flexible connection (7) is sealed between the loss-in-weight scale discharge port connecting flange (1-2) and the receiving reactor inlet connecting flange (3-1).

2. The mechanical pressure compensation device for the loss-in-weight scale according to claim 1, characterized in that, The loss-in-weight scale (1) is equipped with a loss-in-weight scale discharge screw (1-4).

3. The mechanical pressure compensation device for the loss-in-weight scale according to claim 2, characterized in that, The discharge screw (1-4) of the loss-in-weight scale is located inside the discharge pipe (1-3) of the loss-in-weight scale.

4. The mechanical pressure compensation device for the loss-in-weight scale according to claim 1, characterized in that, The feed inlet (1-1) of the loss-in-weight scale is connected to a pneumatic sealing valve (4).

5. The mechanical pressure compensation device for the loss-in-weight scale according to claim 1, characterized in that, The feed inlet (1-1) of the loss-in-weight scale is connected to a feed valve (6) via a feed flexible connector (5).

6. The mechanical pressure compensation device for the loss-in-weight scale according to claim 1, characterized in that, The loss-in-weight scale (1) is provided with a support base (2) at the bottom, and the loss-in-weight scale (1) is installed on the support base (2).

7. The mechanical pressure compensation device for the loss-in-weight scale according to claim 6, characterized in that, The loss-in-weight scale (1) is mounted on the support base (2) via a weighing sensor.

8. The mechanical pressure compensation device for the loss-in-weight scale according to claim 1, characterized in that, The receiving reactor inlet connection flange (3-1) is located on the top of the receiving reactor (3).

9. The mechanical pressure compensation device for the loss-in-weight scale according to claim 1, characterized in that, The receiving reactor inlet connecting flange (3-1) is located on the side wall of the receiving reactor (3).

10. The mechanical pressure compensation device for the loss-in-weight scale according to claim 1, characterized in that, The discharge flexible connector (7) is made of flexible pressure-resistant material.

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