A back suction flow controller

Abstract

The utility model discloses a kind of back suction flow controllers, comprising: shell, flow measuring part and flow regulating mechanism are connected by flow tube in shell and are provided with;Flow regulating mechanism includes electric control valve and back suction switch valve, one end of electric control valve is connected with flow measuring part, and the liquid passage of the other end of electric control valve is connected with back suction switch valve;The gas passage of back suction switch valve is connected with external gas passage by gas passage connector.This utility model discloses a kind of back suction flow controllers, after flow stops, residual fluid is effectively removed in outlet end by back suction structure, prevent dripping, to assist to improve the control performance and system cleanliness of application equipment.

Description

Technical Field

[0001] This utility model relates to the field of flow controller technology, and in particular to a backflow flow controller. Background Technology

[0002] In existing technologies, flow controllers are typically installed on delivery pipelines to detect and adjust flow rates. However, existing flow controllers have the following problems:

[0003] Flow detection and adjustment are not convenient enough;

[0004] The equipment exhibits low compatibility during installation and assembly.

[0005] During the flow monitoring and control process, when it is necessary to stop the fluid output and cut off the flow, residual fluid may leak or become contaminated at the outlet. Utility Model Content

[0006] This invention overcomes the shortcomings of the prior art and provides a back-suction flow controller that effectively removes residual fluid at the outlet end after the flow stops, preventing dripping and thus helping to improve the control performance of the application equipment and the cleanliness of the system.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a backflow flow controller, comprising: a housing, wherein a flow measurement unit and a flow regulation mechanism are disposed within the housing and connected by a flow pipe; the flow regulation mechanism includes an electrically controlled valve and a backflow switching valve, one end of the electrically controlled valve is connected to the flow measurement unit, and the other end of the electrically controlled valve is connected to the liquid circuit of the backflow switching valve; the air circuit of the backflow switching valve is connected to an external air circuit through an air circuit connector.

[0008] In a preferred embodiment of this utility model, one end of the gas connection is connected to an external gas connection, and the other end of the gas connection is connected to one end of the solenoid valve through a gas pipe to introduce external gas. The other end of the solenoid valve is connected to the gas connection of the back suction switch valve.

[0009] In a preferred embodiment of this utility model, one end of the flow measurement unit introduces external fluid through a flow pipe, the other end of the flow measurement unit is connected to one end of an electrically controlled valve, the other end of the electrically controlled valve is connected to the inlet of the liquid path of the back suction switch valve, and the outlet of the liquid path is used to discharge the fluid.

[0010] In a preferred embodiment of this utility model, the housing includes a mounting base and a cover plate that can be opened and closed relative to the mounting base. The mounting base is provided with a cavity, and the cavity and the cover plate form a mounting cavity. A solenoid valve, a flow measuring unit, and an electrically controlled valve are provided in the mounting cavity. The back suction switch valve provided on the housing, the electrically controlled valve, the flow measuring unit, and the solenoid valve are arranged in a groove-shaped structure.

[0011] In a preferred embodiment of this utility model, the mounting cavity is further provided with a motor connected to the electric control valve drive, and a circuit board electrically connected to the motor. The circuit board is connected to an external circuit through a circuit adapter provided on the housing.

[0012] In a preferred embodiment of this utility model, a bottom adapter shell is provided on one side of the mounting base, and the bottom adapter shell is used for assembly and connection with external equipment.

[0013] In a preferred embodiment of this invention, the flow tube or flow measurement unit is confined within the mounting cavity by a flow gland.

[0014] In a preferred embodiment of this utility model, the flow pressure cover includes a support block disposed in a recess of the mounting base, a pressure plate is mounted on the support block, and the opposite sides of the pressure plate and the support block are respectively provided with matching grooves, and the grooves define a flow tube or a flow measurement part.

[0015] In a preferred embodiment of this utility model, the housing has an L-shaped structure, and the back suction switch valve is installed outside the housing and located in the L-shaped groove of the L-shaped structure.

[0016] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0017] The present invention discloses a back-suction flow controller that effectively removes residual fluid at the outlet end after the flow stops through a back-suction structure, preventing dripping and thus helping to improve the control performance of the application equipment and the cleanliness of the system. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the external structure of a backflow flow controller according to this utility model. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the external structure of a backflow flow controller according to this utility model. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the internal structure of a backflow flow controller according to this utility model. Figure 1 ;

[0022] Figure 4 This is a schematic diagram of the internal structure of a backflow flow controller according to this utility model. Figure 2 ;

[0023] Figure 5 This is a side view of the internal structure of a backflow flow controller according to this utility model. Figure 1 ;

[0024] Figure 6 This is a side view of the internal structure of a backflow flow controller according to this utility model. Figure 2 ;

[0025] Figure 7 This is a side view of the internal structure of a backflow flow controller according to this utility model. Figure 3 ;

[0026] Figure 8 This is a side view of the internal structure of a backflow flow controller according to this utility model. Figure 4 ;

[0027] Figure 9 This is a flowchart illustrating the operation of a backflow flow controller according to this utility model;

[0028] The components are as follows: 1. Housing; 11. Cover plate; 12. Mounting seat; 13. Mounting cavity; 2. Back suction switch valve; 31. Circuit board; 32. Circuit connector; 33. Motor; 34. Air connector; 35. Valve mounting seat; 351. Electrically controlled valve; 352. Valve end cap; 353. Screw connector; 36. Solenoid valve; 37. Bottom adapter shell; 38. Flow pressure cap; 39. Flow pipe; 41. Air inlet; 42. Air outlet; 51. Liquid inlet; 52. Liquid outlet; 6. Flow measurement unit. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features therein are detailed descriptions of the present invention, rather than limitations thereof. In the absence of conflict, the embodiments of the present invention and the technical features therein can be combined with each other.

[0030] The term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship. Example 1

[0031] like Figures 1-8As shown, this utility model discloses a backflow flow controller, comprising: a housing 1, the housing 1 including a mounting base 12 and a cover plate 11 that can be opened and closed relative to the mounting base 12; a cavity is provided on the mounting base 12, and a mounting cavity 13 is formed between the cavity and the cover plate 11; a flow measurement unit 6 and a flow regulating mechanism are provided in the mounting cavity 13 and connected by a flow pipe 39; the flow regulating mechanism includes an electrically controlled valve 351 and a backflow switching valve 2; one end of the electrically controlled valve 351 is connected to the flow measurement unit 6, and the other end of the electrically controlled valve 351 is connected to the liquid circuit of the backflow switching valve 2; the gas circuit of the backflow switching valve 2 is connected to an external gas circuit through a gas circuit connector 34. The backflow switching valve 2, the electrically controlled valve 351, the flow measurement unit 6, and the solenoid valve 36 arranged on the housing 1 are in a groove-shaped structure.

[0032] Specifically, one end of the flow measurement unit 6 introduces external fluid through the flow pipe 39, and the other end of the flow measurement unit 6 is connected to one end of the electrically controlled valve 351. The other end of the electrically controlled valve 351 is connected to the inlet 51 of the liquid path of the back suction switch valve 2, and the outlet 52 of the liquid path is used to discharge the fluid. Furthermore, in this embodiment, the back suction switch valve 2 is a GT3I2R back suction switch valve.

[0033] Specifically, one end of the solenoid valve 36 serves as an air inlet 41 for introducing external gas, and the other end serves as an air outlet 42. One end of the air connector 34 is connected to an external air circuit, and the other end of the air connector 34 is connected to the air inlet 41 of the solenoid valve 36 via an air pipe to introduce external gas. The air outlet 42 of the other end of the solenoid valve 36 is connected to the air circuit of the backflow switch valve 2. The electrically controlled valve 351 is installed in the recess of the mounting base 12 via the valve end cap 352, the valve mounting seat 35, and the screw connector 353. Further, in this embodiment, the air connector 34 is a KQ2E04-00 air connector, and the air connector 34 is fixed to the corresponding hole in the housing 1 with a nut. The solenoid valve 36 is a 3QE110M5 solenoid valve, and the solenoid valve 36 is fixed to the corresponding hole in the housing 1 with screws.

[0034] Working principle:

[0035] This invention relates to a back-suction flow controller. After the flow stops, the back-suction switch valve 2 effectively removes residual fluid from the outlet, preventing dripping and thus improving the control performance of the application equipment and the cleanliness of the system. This flow controller with back-suction function combines precise flow control technology with a unique fluid back-suction function, solving the problem of dripping that easily occurs when the liquid supply of traditional flow controllers stops. Example 2

[0036] Based on Example 1, such as Figures 1-8As shown, the mounting cavity 13 also houses a motor 33 connected to the electrically controlled valve 351 and a circuit board 31 electrically connected to the motor 33. The circuit board 31 is connected to an external circuit via a circuit adapter 32 mounted on the housing 1. The motor 33 connected to the electrically controlled valve 351 is a product of the prior art, and the circuit structure on the circuit board 31 connected to the motor 33 also adopts a motor drive circuit of the prior art. The specific structure will not be described in detail here, as long as it can basically achieve the driving of the electrically controlled valve 351. Example 3

[0037] Based on Embodiment 1 or Embodiment 2, a bottom adapter shell 37 is provided on one side of the mounting base 12. The bottom adapter shell 37 is used for assembly and connection with external equipment. The housing 1 has an L-shaped structure, and the back suction switch valve 2 is installed on the outside of the housing 1 and located in the L-shaped groove of the L-shaped structure. Example 4

[0038] Based on Embodiment 1, Embodiment 2, or Embodiment 3, the flow tube 39 or the flow measuring unit 6 is confined in the mounting cavity 13 by the flow pressure cap 38. Specifically, the flow pressure cap 38 includes a support block disposed in the recess of the mounting base 12, a pressure plate mounted on the support block, and mating grooves disposed on opposite sides of the pressure plate and the support block, the grooves defining the flow tube 39 or the flow measuring unit 6. Example 5

[0039] Based on Example 1, flow control includes the establishment and regulation of fluid pathways.

[0040] The flow controller has an internal fluid passage, which includes a flow measurement unit 6 and a flow regulation mechanism connected via a flow pipe 39. The flow regulation mechanism is the core component for flow control and is a valve that adjusts the cross-sectional area of ​​the fluid passage. The drive motor 33 drives the electrically controlled valve 351 of the flow regulation mechanism to operate (adjusting the valve opening of the electrically controlled valve 351). The fluid (medium) forms a controllable pressure difference and flow resistance in the fluid passage, thereby controlling the speed and total amount of fluid passing through the flow controller. Example 6

[0041] Based on Example 2, flow control includes: flow monitoring and feedback.

[0042] The flow measurement unit 6 in this embodiment includes a pipe for introducing fluid, and a flow sensor for detecting fluid flow rate is installed in the pipe. In this embodiment, the pipe can be a flow tube 39, with both ends connected to the pipelines at both ends via adapters in the prior art to form a semi-frame structure; however, it is not limited to this. In other embodiments, other types of flow measurement unit structures in the prior art can be selected, as long as they can basically realize fluid delivery and flow sensor installation. The flow sensor can be a flow sensor in the prior art, and the model of the flow sensor is not limited here, as long as it can detect the flow rate of the medium flowing through the flow measurement unit 6 and obtain the measured flow signal. The actual measured flow rate is compared with the target flow rate. If there is a deviation, the direction of the drive motor 33 is changed, the valve opening of the electronically controlled valve 351 is adjusted, thereby changing the flow rate in the fluid passage and improving the actual flow rate to follow the target flow rate. Example 7

[0043] Based on Example 4, such as Figures 1-9 As shown, the back-suction method includes:

[0044] When the fluid supply and back suction are stopped: When it is necessary to stop the fluid output, especially to prevent residual fluid leakage or contamination at the outlet, the drive motor 33 closes the electrically controlled valve 351 of the flow regulation mechanism to cut off the forward fluid supply.

[0045] Negative pressure or reverse suction is generated: The back suction is activated simultaneously with or immediately after the main flow channel is closed. The resulting negative pressure or reverse suction is in the opposite direction to the normal fluid outflow and is sufficient to overcome the surface tension, gravity, and adhesion of the residual fluid to the pipe wall.

[0046] Residual fluid backflow and removal: Under negative pressure or reverse suction, residual fluid located at the outlet 52 and in the adjacent downstream pipe is rapidly drawn back or pulled back to the upstream fluid storage unit. Effective backflow ensures that the outlet remains dry and clean after the supply stops, completely eliminating dripping and preventing contamination of the operating environment, samples, or subsequent processes, significantly improving the system's precision and reliability.

[0047] Based on the preferred embodiments of this utility model, and through the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A backflow flow controller, characterized in that, include: The housing (1) is provided with a flow measurement unit (6) and a flow regulation mechanism connected by a flow tube (39); The flow regulation mechanism includes an electrically controlled valve (351) and a backflow switch valve (2). One end of the electrically controlled valve (351) is connected to the flow measurement unit (6), and the other end of the electrically controlled valve (351) is connected to the liquid circuit of the backflow switch valve (2). The gas circuit of the backflow switch valve (2) is connected to an external gas circuit through a gas circuit connector (34).

2. The backflow flow controller according to claim 1, characterized in that: One end of the gas connector (34) is connected to an external gas circuit, and the other end of the gas connector (34) is connected to one end of the solenoid valve (36) through a gas pipe to introduce external gas. The other end of the solenoid valve (36) is connected to the gas circuit of the back suction switch valve (2).

3. A backflow flow controller according to claim 2, characterized in that: One end of the flow measurement unit (6) introduces external fluid through the flow pipe (39), and the other end of the flow measurement unit (6) is connected to one end of the electric control valve (351). The other end of the electric control valve (351) is connected to the inlet (51) of the liquid path of the back suction switch valve (2), and the outlet (52) of the liquid path is used to discharge fluid.

4. A backflow flow controller according to claim 3, characterized in that: The housing (1) includes a mounting base (12) and a cover plate (11) that can be opened and closed relative to the mounting base (12). The mounting base (12) is provided with a cavity, and the cavity and the cover plate (11) form a mounting cavity (13). The mounting cavity (13) is provided with a solenoid valve (36), a flow measurement unit (6), and an electrically controlled valve (351). The back suction switch valve (2) provided on the housing (1), the electrically controlled valve (351), the flow measurement unit (6), and the solenoid valve (36) are arranged in a groove-shaped structure.

5. A backflow flow controller according to claim 4, characterized in that: The mounting cavity (13) is also provided with a motor (33) that is driven by an electric control valve (351) and a circuit board (31) that is electrically connected to the motor (33). The circuit board (31) is connected to an external circuit through a circuit adapter (32) provided on the housing (1).

6. A backflow flow controller according to claim 5, characterized in that: The mounting base (12) is provided with a bottom adapter shell (37) on one side, which is used for assembly and connection with external equipment.

7. A backflow flow controller according to claim 6, characterized in that: The flow tube (39) or flow measurement unit (6) is confined in the mounting cavity (13) by the flow gland (38).

8. A backflow flow controller according to claim 7, characterized in that: The flow pressure cap (38) includes a support block disposed in a cavity of the mounting base (12), a pressure plate is mounted on the support block, and the opposite sides of the pressure plate and the support block are respectively provided with engaging grooves, the grooves defining the flow tube (39) or the flow measurement unit (6).

9. A backflow flow controller according to claim 8, characterized in that: The housing (1) has an L-shaped structure, and the back suction switch valve (2) is installed outside the housing (1) and located in the L-shaped groove of the L-shaped structure.

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