Inflation and drainage device and hydraulic system

Abstract

The utility model relates to the technical field of fluid transmission and control, in particular to an inflation and drainage device and a hydraulic system. The inflation and drainage device is used for inflating gas with fixed volume and fixed pressure into an elastic air bag in a closed box body, an extension part extending outwards is arranged at the top of the box body, and the inflation and drainage device comprises a support, a drainage device and a drainage device, and a platform or a groove for placing the extension part is formed in the support; the weight sensor is arranged between the extension part and the bracket and is used for detecting the weight of the box body; and the controller is electrically connected with the weight sensor and the first electromagnetic valve at the liquid outlet of the box body, and the controller controls opening and closing of the first electromagnetic valve according to the weight change, detected by the weight sensor, of the box body. The technical problems that in the prior art, in the inflation and drainage process of an air bag in a closed box, the operation process of manually reading the liquid volume of liquid drained into a measuring cylinder is complex, the measurement error is large, consequently, the inflation and drainage precision is low, the working efficiency is low, and pollution is likely to be caused are solved.

Description

Technical Field

[0001] This utility model relates to the field of fluid transmission and control technology, and in particular to an air-filling and liquid-draining device and a hydraulic system. Background Technology

[0002] In common hydraulic systems, the hydraulic fluid surface is in contact with the atmosphere, and atmospheric pressure forces the hydraulic oil into the hydraulic pump port. This system has many drawbacks. For example, moisture in the air can enter the hydraulic fluid, causing emulsification; dust in the air can also enter the hydraulic fluid, causing contamination; and this system is difficult to use on moving equipment because of the risk of oil spillage, which would pollute the environment. To overcome these drawbacks, some closed-loop bladder-pressurized hydraulic modules have emerged. These bladder-pressurized hydraulic modules maintain the pressure of the fluid inside the hydraulic module by setting an inflatable bladder, allowing the hydraulic fluid to flow smoothly from the oil port even in a closed environment. However, the existing inflation and deflation processes are very complex, inefficient, and have low precision.

[0003] For example, the invention patent with patent number "CN202110104773.4" and titled "A Constant Volume and Constant Pressure Inflating Device and Method" discloses an inflating device including a tank, a capsule, and a valve block assembly. When a volume of gas V0 is inflated into the capsule, the volume of hydraulic oil discharged from the tank is measured using a measuring cylinder. However, using a measuring cylinder to measure the volume of discharged hydraulic oil to ensure the volume of gas available to the capsule is not practical and is prone to significant measurement errors. The reasons are as follows:

[0004] 1. When reading the volume of hydraulic oil in a graduated cylinder, the cylinder filled with liquid should be placed on a level and stable table; your eyes should be at the same level as the highest point of the concave meniscus or the lowest point of the convex meniscus. Looking up, looking down, or holding the graduated cylinder by hand will all affect the accuracy of the reading.

[0005] 2. When the hydraulic oil in the measuring cylinder reaches the standard value, it is necessary to manually close the filling and draining ports. During operation, it is difficult to ensure the accuracy of the hydraulic oil in the measuring cylinder, which seriously affects the operating efficiency. Moreover, manually closing the filling and draining ports can easily spill hydraulic oil onto the ground, causing pollution to the working environment. Utility Model Content

[0006] To address the technical problems in existing technologies where manually reading the volume of liquid discharged into a measuring cylinder during the inflation and drainage process of an airbag within a sealed container is complex, has large measurement errors leading to low inflation and drainage accuracy, low work efficiency, and easy contamination, this invention provides an inflation and drainage device and a hydraulic system that solves the aforementioned technical problems.

[0007] To solve the above-mentioned technical problems, this utility model provides an inflation and drainage device for inflating a fixed volume and pressure of gas into an elastic airbag inside a sealed box. The top of the box has an outwardly extending extension. The device includes:

[0008] A support having a platform or groove for placing the extension portion;

[0009] A weight sensor is disposed between the extension portion and the bracket for detecting the weight of the housing;

[0010] The controller is electrically connected to the weight sensor and the first solenoid valve at the liquid outlet of the tank. The controller controls the opening and closing of the first solenoid valve according to the weight change of the tank detected by the weight sensor.

[0011] According to one embodiment of the present invention, the housing is further provided with a pressure control module. The pressure control module includes a pressure sensor disposed inside the housing and an air valve disposed on the air port of the elastic airbag. The pressure sensor is used to detect the pressure inside the housing. The controller is electrically connected to the air valve and the pressure sensor respectively. The controller controls the opening and closing of the air valve according to the pressure detected by the pressure sensor.

[0012] According to one embodiment of the present invention, the pressure control module further includes a pneumatic reversing valve, which is connected to the air valve via an air supply pipe, and the controller is electrically connected to the pneumatic reversing valve.

[0013] This utility model also provides a hydraulic system, including: a closed box housing with an internal elastic airbag, an inflation and drainage device as described above, and a liquid module. The inflation and drainage device is used to inflate the elastic airbag with a fixed volume and pressure of gas. The liquid module includes a storage tank. A first solenoid valve at the outlet of the box housing is connected to the storage tank through a first liquid delivery pipe to form a first channel for liquid flow between the box housing and the storage tank.

[0014] According to one embodiment of the present invention, a hydraulic reversing valve is provided on the liquid storage tank. The first valve port of the hydraulic reversing valve is connected to the first infusion pipe, the second valve port of the hydraulic reversing valve is connected to the second infusion pipe in the liquid storage tank, and the third valve port of the hydraulic reversing valve is connected to the hydraulic pump in the liquid storage tank through the third infusion pipe. The hydraulic pump is used to output the liquid in the liquid storage tank to the hydraulic reversing valve.

[0015] According to one embodiment of the present invention, the liquid module further includes a valve block disposed on the top of the tank. One end of the valve block is connected to an electric pump inside the tank, and the other end of the valve block is connected to a storage tank in sequence through a second solenoid valve and a mixing pipeline, so as to form a second channel for liquid and / or gas flow between the tank and the storage tank.

[0016] According to one embodiment of the present invention, the liquid module further includes a secondary liquid tank disposed between the mixing pipeline and the storage tank, the top of the secondary liquid tank being connected to the mixing pipeline, and a fourth delivery pipe connected to the storage tank being disposed in the middle of the secondary liquid tank.

[0017] According to one embodiment of the present invention, the auxiliary liquid tank is further provided with a return liquid filter for filtering gas and / or contaminants in the liquid in the auxiliary liquid tank.

[0018] According to one embodiment of the present invention, the auxiliary liquid tank is further provided with an air filter for discharging gas that enters the auxiliary liquid tank through the mixing pipeline.

[0019] According to one embodiment of the present invention, the liquid module further includes a liquid chiller and a heater disposed in the liquid storage tank, wherein the liquid chiller is connected to the liquid storage tank via a fifth liquid delivery pipe.

[0020] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0021] 1. The inflation and drainage device of this utility model has a platform or groove formed on the support for placing the outer extension of the box, and a weight sensor is set between the support and the box. Therefore, the box can be placed on the weight sensor on the support when inflation and drainage are required. By setting a preset gas volume for the gas to be filled into the elastic air bladder, inflation and drainage can be automatically implemented, reducing complicated manual operation steps. The inflation and drainage process is relatively simple and the work efficiency is high. Moreover, compared with manual reading of measuring cylinder values ​​and manual closing of solenoid valve, it has higher accuracy and shorter delay, which is conducive to achieving precise control of inflation and drainage and meeting actual production needs.

[0022] 2. The inflation and drainage device of this utility model is further provided with the controller electrically connected to the air valve on the elastic airbag and the pressure sensor inside the box, so that the controller can control the drainage and inflation at the same time, which can effectively avoid the delay of manual operation and improve work efficiency.

[0023] 3. The hydraulic system of this utility model, since it includes the above-mentioned air-filling and liquid-draining device, also has the above-mentioned beneficial effects;

[0024] 4. The hydraulic system of this utility model, by setting a valve block on the top of the box and connecting the two ends of the valve block to the electric pump and the liquid storage tank inside the box respectively, forms a second channel for the flow of liquid and / or gas between the box and the liquid storage tank. This allows the liquid and gas suspended in the box to completely leave the box through the second channel and be stored in the liquid storage tank again. When liquid is injected into the box, the space inside the box except for the elastic air bladder can be filled with liquid, so that the liquid volume reaches the rated volume of the box and improves the accuracy of inflation and drainage.

[0025] 5. The hydraulic system of this utility model further includes a secondary liquid tank between the mixing pipeline and the storage tank, and a fourth liquid delivery pipe is set in the middle of the secondary liquid tank, so that impurities in the liquid can be deposited at the bottom of the secondary liquid tank, thus ensuring the quality of the liquid in the storage tank. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the air-filling and liquid-draining device of this utility model;

[0027] Figure 2 This is a schematic diagram of the hydraulic system of this utility model;

[0028] Figure 3 This is a schematic diagram of the hydraulic system after the air is vented from the housing.

[0029] Figure 4 This is a schematic diagram of the hydraulic system after the elastic airbag has been fully compressed.

[0030] Figure 5 A schematic diagram of the state of a hydraulic system after a constant volume and pressure of gas is filled into an elastic airbag;

[0031] In the diagram: 1-Box body; 11-Extension; 12-Electric pump; 2-Elastic airbag; 3-Bracket; 4-Weight sensor; 5-Controller; 6-First solenoid valve; 7-Pressure control module; 71-Pressure sensor; 72-Air valve; 73-Pneumatic directional valve; 74-Air supply pipe; 8-Liquid module; 81-Reservoir tank; 811-Hydraulic directional valve; 812-Second supply pipe; 813-Third supply pipe; 814-Hydraulic pump; 815-Liquid level and temperature sensor; 816-Replenishment pipe; 82-First supply pipe; 83-Valve block; 84-Second solenoid valve; 85-Mixed supply pipe; 86-Substitute liquid tank; 861-Fourth supply pipe; 862-Return filter; 863-Air filter; 87-Liquid chiller; 871-Inlet pipe; 872-Outlet pipe; 88-Heater. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0035] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0036] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0037] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0038] like Figure 1 As shown, this embodiment provides an inflation and drainage device for inflating a fixed volume and pressure of gas into an elastic airbag 2, such as a bladder, inside a sealed box 1. The top of the box 1 has an outwardly extending extension 11. The device includes a support 3, a weight sensor 4, and a controller 5. The support 3 has a platform or groove for placing the extension 11. The extension 11 is positioned between the support 3 and the support 3 to detect the weight of the box 1. The controller 5 is electrically connected to the weight sensor 4 and a first solenoid valve 6 at the outlet of the box 1. The controller 5 controls the opening and closing of the first solenoid valve 6 based on the weight change of the box 1 detected by the weight sensor 4. To ensure the accuracy of weight measurement, the weight sensor 4 can be symmetrically arranged on the platform or groove of the support 3. The bearing surface of the weight sensor 4 can be slightly larger than the contact surface of the extension 11 of the box 1 located above the support 3.

[0039] It is understandable that, based on the density formula ρ = m / v, the volume of the output liquid can be obtained by knowing the weight change of the liquid inside the box 1 (i.e., the weight change of the box 1 placed on the support 3) and the liquid density, where ρ represents the liquid density, m represents the liquid weight, and v represents the liquid volume. Therefore, in the inflation and drainage device of this utility model embodiment, by setting a weight sensor 4 between the support 3 and the box 1 to detect the change in the box 1, the controller 5 can calculate the preset box weight change ΔM based on the fillable volume V inside the box 1, the preset gas constant volume V1 of the gas filled into the elastic airbag 2 (i.e., the preset drainage volume of the liquid to be output from the box 1), and the liquid density ρ, i.e., ΔM = ρV1. During the inflation and drainage process, when the actual weight change of the box 1 detected by the weight sensor 4 is equal to the preset box weight change ΔM, the controller 5 can control the first solenoid valve 6 to close, completing the drainage of the preset gas constant volume V1.

[0040] In one embodiment of this utility model, the housing 1 is further provided with a pressure control module 7. The pressure control module 7 includes a pressure sensor 71 disposed inside the housing 1 and an air valve 72 disposed on the air port of the elastic airbag 2. The pressure sensor 71 is used to detect the pressure inside the housing 1. The controller 5 is electrically connected to the air valve 72 and the pressure sensor 71 respectively. The controller 5 controls the opening and closing of the air valve 72 according to the pressure detected by the pressure sensor 71.

[0041] It is understandable that, according to Pascal's principle, pressure applied to a liquid or gas will propagate evenly in all directions and act on every point within the container. When pressure sensor 71 detects that the pressure inside the chamber 1 reaches the preset pressure P1, the gas pressure inside the elastic airbag 2 is also P1, and controller 5 can then control the air valve 72 to close, stopping inflation. In some other embodiments of this invention, a separate control unit for the air valve 72 can be provided on the chamber 1 and connected to both the pressure sensor 71 and the air valve 72 to achieve automatic control of the air valve 72; this embodiment does not impose such limitations.

[0042] In one embodiment of this utility model, the pressure control module 7 may further include a pneumatic reversing valve 73. The pneumatic reversing valve 73 is connected to the air valve 72 via an air supply pipe 74. The controller 5 is also electrically connected to the pneumatic reversing valve 73, so that the controller 5 can not only control the air pump installed on the pneumatic reversing valve 73 to fill the elastic airbag 2 with external gas through the air supply pipe 74 and the air valve 72, but also discharge the gas in the elastic airbag 2 through the pneumatic reversing valve 73, thereby controlling the amount of gas in the elastic airbag 2. Optionally, the pneumatic reversing valve 73 may be installed on one side of the controller 5. When the elastic airbag 2 reaches the preset gas volume and preset pressure, the pneumatic reversing valve 73 may be removed together with the inflation and drainage device.

[0043] In addition, to achieve the above objectives, this utility model also proposes a hydraulic system.

[0044] like Figure 2 As shown, the hydraulic system of this embodiment includes a closed housing 1 with an internal elastic airbag 2, an inflation and drainage device as described above, and a liquid module 8. The inflation and drainage device is used to inflate the elastic airbag 2 with a fixed volume and pressure of gas. The liquid module 8 may include a storage tank 81. A first solenoid valve 6 at the outlet of the housing 1 is connected to the storage tank 81 via a first delivery pipe 82, forming a first channel for liquid flow between the housing 1 and the storage tank 81. This allows liquid discharged from the housing 1 to be stored in the storage tank 81 through the first channel. When liquid needs to be input into the housing 1, the liquid can be directly output from the storage tank 81 and enter the housing 1 through the first channel, achieving liquid reuse and improving liquid utilization. The storage tank 81 can be a non-fully enclosed housing. By introducing air into the storage tank 81 to balance the pressure, excessive liquid pressure is prevented from preventing liquid from entering the storage tank 81.

[0045] Specifically, the liquid storage tank 81 may be equipped with a hydraulic directional valve 811. The first valve port of the hydraulic directional valve 811 is connected to the first liquid delivery pipe 82, and the second valve port of the hydraulic directional valve 811 is connected to the second liquid delivery pipe 812 inside the liquid storage tank 81. The second liquid delivery pipe 812 is used to output the liquid input from the first liquid delivery pipe 82. The third valve port of the hydraulic directional valve 811 is connected to the hydraulic pump 814 inside the liquid storage tank through the third liquid delivery pipe 813. The hydraulic pump 814 is used to output the liquid in the liquid storage tank 81 to the hydraulic directional valve 811, so that the hydraulic directional valve 811 inputs liquid to the tank body 1 through the first liquid delivery pipe 82.

[0046] In one embodiment of this utility model, a liquid level and temperature sensor 815 can also be installed in the liquid storage tank 81. When the liquid level and temperature sensor 815 detects that the liquid level in the liquid storage tank 81 is at the lowest level, the liquid storage tank 81 can be replenished through the liquid replenishment pipe 816. When the liquid in the liquid storage tank 81 reaches the highest level, the liquid replenishment is stopped.

[0047] In one embodiment of the present invention, the liquid module 8 may further include a valve block 83 disposed on the top of the housing 1. One end of the valve block 83 is connected to the electric pump 12 inside the housing 1, and the other end of the valve block 83 is connected to the liquid storage tank 81 in sequence through the second solenoid valve 84 and the mixing pipeline 85, so as to form a second channel for the flow of liquid and / or gas between the housing 1 and the liquid storage tank 81.

[0048] It is understandable that, considering that some gas may be dissolved in the liquid inside the box 1, the electric pump 12 can actively extract the liquid or gas inside the box 1. Before inflation and liquid discharge, the liquid and / or gas inside the box 1 can be emptied in a better way, so that when liquid is injected into the box 1, the space inside the box 1 except for the elastic airbag 2 can be filled with liquid, so that the liquid volume reaches the rated volume of the box 1, and ensure that the gas volume in the elastic airbag 2 after inflation can reach the preset gas volume V1.

[0049] In one embodiment of this utility model, the liquid module 8 may further include a secondary liquid tank 86 disposed between the mixing pipeline 85 and the storage tank 81. The top of the secondary liquid tank 86 is connected to the mixing pipeline 85, and a fourth infusion pipe 861 connected to the storage tank 81 is provided in the middle of the secondary liquid tank 86. By setting the secondary liquid tank 86 between the mixing pipeline 85 and the storage tank 81, and setting the fourth infusion pipe 861 connected to the storage tank 81 in the middle of the secondary liquid tank 86, the liquid will only flow back into the storage tank 81 when the liquid level inside the secondary liquid tank 86 reaches the height of the fourth infusion pipe 861. Impurities in the liquid can be deposited at the bottom of the secondary liquid tank 86. By regularly cleaning the secondary liquid tank 86, the purity of the liquid in the storage tank 81 and the tank body 1 can be better guaranteed.

[0050] In a preferred embodiment of this utility model, a return liquid filter 862 may also be provided in the auxiliary liquid tank 86 to filter out gas and / or contaminants in the liquid in the auxiliary liquid tank 86. The fourth infusion pipe 861 may be directly connected to the output end of the return liquid filter 862 to ensure the purity of the liquid entering the storage tank 81.

[0051] In one embodiment of this utility model, an air filter 863 may also be provided on the auxiliary liquid tank 86 to discharge the gas that enters the auxiliary liquid tank 86 through the mixing pipeline 85, so as to prevent the gas input into the auxiliary liquid tank 86 from the tank 1 from re-entering the storage tank 81.

[0052] Since the liquid storage tank 81 may also store some gas, an air filter can be configured for the liquid storage tank 81. When the liquid level of the liquid storage tank 81 changes, external gas can be discharged or enter the liquid storage tank 81 through the air filter to achieve internal pressure balance.

[0053] If the temperature of the liquid changes during the outflow process, the liquid density may change, which will affect the actual output liquid volume and cause the actual output liquid volume to fail to meet the actual demand.

[0054] As a preferred technical solution in this embodiment, in order to maintain the liquid temperature within a certain range, the liquid module 8 may further include a liquid chiller 87 and a heater 88 disposed in the liquid storage tank 81. The liquid chiller 87 can be connected to the liquid storage tank 81 through a fifth liquid delivery pipe. The fifth liquid delivery pipe can be divided into an inlet pipe 871 for the liquid chiller 87 to input liquid into the liquid storage tank 81 and an outlet pipe 872 for inputting liquid from the liquid storage tank 81 into the liquid chiller 87. If the actual temperature of the liquid in the liquid storage tank 81 is lower than the preset temperature, the heater 88 starts to heat the liquid. The liquid inside the liquid storage tank 81 flows into the liquid chiller 87 through the inlet pipe and flows out of the liquid chiller 87 through the outlet pipe. At this time, the liquid chiller 87 only plays the role of liquid circulation, so that the liquid in the liquid storage tank 81 is heated evenly. If the actual temperature of the liquid is higher than the preset temperature, the cooling system of the liquid chiller 87 is activated and the heater 88 stops working, so that the liquid in the storage tank 81 is cooled evenly, and the temperature of the liquid flowing between the tank 1 and the storage tank 81 is controlled near the preset temperature to ensure that the liquid pressure remains stable.

[0055] The working principle of the inflation and drainage device in a hydraulic system is described below with reference to a specific embodiment of this utility model. Inflating the housing 1 may specifically include the following steps:

[0056] (1) Preparatory work

[0057] Place the housing 1 on the weight sensor 4 on the bracket 3, such as Figure 2 As shown. Since the box 1 is connected to the storage tank 81 through the first infusion tube 82, during preparation, it is not necessary to move the storage tank 81 and its other attached devices. Simply fix the bracket 3 to one side of the storage tank 81, for example, place it directly above the storage tank 81, then move the box 1 and connect the relevant wiring of the controller 5.

[0058] (2) Exhaust from the box

[0059] Switch the hydraulic directional valve 811 to the filling state, open the first solenoid valve 6 and the second solenoid valve 84, switch the pneumatic directional valve 73 to the unloading state, and start the hydraulic pump 814 so that the liquid in the storage tank 81 enters the tank 1 through the first delivery pipe 82. The gas inside the tank 1 is discharged into the auxiliary liquid tank 86 through the mixing pipe 85 and then enters the atmosphere through the air filter 863. During this process, when the gas inside the tank 1 is completely discharged, the liquid inside the tank 1 will enter the auxiliary liquid tank 86 through the mixing pipe 85. Since the density of the liquid is greater than that of the gas, the liquid will settle at the bottom of the auxiliary liquid tank 86. When the liquid level in the auxiliary liquid tank 86 reaches the height of the return filter 862, it can flow into the storage tank 81 through the fourth delivery pipe 861. Because the oil flow capacity of the return filter 862 is much greater than the flow rate of the hydraulic pump 814 outlet, the liquid in the auxiliary liquid tank 86 will not overflow. Throughout the process, weight sensor 4 can detect the weight of chamber 1 in real time. The value detected by weight sensor 4 will continuously increase. When the weight of chamber 1 stops increasing, it indicates that the venting process is complete. At this time, the state of the liquid system is as follows: Figure 3 As shown.

[0060] (3) Compression airbag

[0061] The second solenoid valve 84 is closed, controlling the hydraulic pump 814 to continue filling the housing 1 with liquid. The gas inside the elastic airbag 2 can be discharged into the atmosphere through the air valve 72 and the pneumatic reversing valve 73. Figure 4 As shown. An overflow valve can also be installed on the pneumatic reversing valve 73. The opening pressure of the overflow valve can be set to a fixed value, such as 2 bar. In this way, when the pressure sensor 717 in the housing 1 detects a pressure of 2 bar, it indicates that the elastic airbag 2 has been fully compressed. The weight M1 detected by the weight sensor 4 at this time is recorded, which is the initial weight of the housing 1 before inflation and drainage.

[0062] (4) Inflate and drain the box

[0063] The preset gas volume V1 and the preset pressure P1 of the elastic airbag 2 are set in advance on the controller 5. It can be understood that, based on the preset gas volume V1 and the liquid density, the weight M2 of the box 1 after inflation and liquid discharge can be calculated as M1-ΔM, where ΔM=ρV1.

[0064] Switching the hydraulic directional valve 811 to the unloading state and the pneumatic directional valve 73 to the inflation state, the air pump on the pneumatic directional valve 73 is started, allowing gas to enter the elastic air bladder 2 through the pneumatic directional valve 73. At this time, the liquid in the oil tank is pressurized and flows from the hydraulic directional valve 811 into the liquid storage tank 81, thus reducing the weight of the tank body 1. When the weight sensor 4 detects a weight change of ΔM in the tank body 1, or when the weight of the tank body 1 after inflation and drainage is M2, the controller 5 can control the first solenoid valve 6 to close and stop drainage.

[0065] (5) Inflation of the airbag

[0066] The air pump continuously inflates the elastic airbag. When the pressure sensor 71 inside the chamber detects that the pressure inside chamber 1 reaches the preset pressure P1, the air pump is turned off, completing the pressurization of the elastic airbag 2. Simultaneously, the main function of the inflation and drainage device is completed. Figure 5 As shown. At this point, the staff can remove the box from the support, disassemble other components in the hydraulic system connected to the inflation and drainage device, and completely remove the inflation and drainage device without affecting the normal operation of the hydraulic system. The box, storage tank, and other devices can be arranged according to actual needs.

[0067] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A gas-liquid displacement device for charging a flexible gas bag (2) in a closed tank (1) with a gas of a constant volume and constant pressure, characterized in that, The top of the housing (1) is provided with an outwardly extending extension (11), and the device includes: The bracket (3) has a platform or groove formed on it for placing the extension portion (11); A weight sensor (4) is disposed between the extension (11) and the bracket (3) for detecting the weight of the housing (1); The controller (5) is electrically connected to the weight sensor (4) and the first solenoid valve (6) at the liquid outlet of the box (1). The controller (5) controls the opening and closing of the first solenoid valve (6) according to the weight change of the box (1) detected by the weight sensor (4).

2. The gas and liquid separation device of claim 1, wherein, The housing (1) is also provided with a pressure control module (7). The pressure control module (7) includes a pressure sensor (71) installed inside the housing (1) and an air valve (72) installed on the air port of the elastic airbag (2). The pressure sensor (71) is used to detect the pressure inside the housing (1). The controller (5) is electrically connected to the air valve (72) and the pressure sensor (71) respectively. The controller (5) controls the opening and closing of the air valve (72) according to the pressure detected by the pressure sensor (71).

3. The gas and liquid separation device of claim 2, wherein, The pressure control module (7) also includes a pneumatic reversing valve (73), which is connected to the air valve (72) via an air supply pipe (74), and the controller (5) is electrically connected to the pneumatic reversing valve (73).

4. A hydraulic system characterized by, include: The enclosed box (1) containing an elastic airbag (2), the inflation and drainage device and the liquid module (8) as described in any one of claims 1-3, wherein the inflation and drainage device is used to inflate the elastic airbag (2) with a fixed volume and pressure of gas, and the liquid module (8) includes a liquid storage tank (81), wherein a first solenoid valve (6) at the liquid outlet of the box (1) is connected to the liquid storage tank (81) through a first liquid delivery pipe (82) to form a first channel for liquid flow between the box (1) and the liquid storage tank (81).

5. The hydraulic system of claim 4, wherein, The liquid storage tank (81) is equipped with a hydraulic directional valve (811). The first valve port of the hydraulic directional valve (811) is connected to the first infusion pipe (82). The second valve port of the hydraulic directional valve (811) is connected to the second infusion pipe (812) inside the liquid storage tank (81). The third valve port of the hydraulic directional valve (811) is connected to the hydraulic pump (814) inside the liquid storage tank (81) through the third infusion pipe (813). The hydraulic pump (814) is used to output the liquid in the liquid storage tank (81) to the hydraulic directional valve (811).

6. The hydraulic system of claim 4, wherein, The liquid module (8) also includes a valve block (83) disposed on the top of the housing (1). One end of the valve block (83) is connected to the electric pump (12) inside the housing (1), and the other end of the valve block (83) is connected to the liquid storage tank (81) in sequence through a second solenoid valve (84) and a mixing pipeline (85) to form a second channel for liquid and / or gas flow between the housing (1) and the liquid storage tank (81).

7. The hydraulic system of claim 6, wherein, The liquid module (8) also includes a secondary liquid tank (86) disposed between the mixing pipeline (85) and the storage tank (81). The top of the secondary liquid tank (86) is connected to the mixing pipeline (85), and a fourth delivery pipe (861) connected to the storage tank (81) is provided in the middle of the secondary liquid tank (86).

8. The hydraulic system of claim 7, wherein, The auxiliary liquid tank (86) is also equipped with a return liquid filter (862) for filtering gas and / or contaminants in the liquid in the auxiliary liquid tank (86).

9. The hydraulic system of claim 7, wherein, The auxiliary liquid tank (86) is also equipped with an air filter (863) for discharging the gas that enters the auxiliary liquid tank (86) through the mixing pipeline (85).

10. The hydraulic system of claim 4, wherein, The liquid module (8) also includes a liquid chiller (87) and a heater (88) disposed in the liquid storage tank (81). The liquid chiller (87) is connected to the liquid storage tank (81) through a fifth liquid delivery pipe.

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