Negative pressure control valve and negative pressure dust extraction system

Abstract

The utility model provides a negative pressure control valve and a negative pressure dust extraction system.The negative pressure control valve comprises a valve seat, an inner cavity is formed in the valve seat, a negative pressure inlet communicating with the inner cavity is formed in the side, in the first direction, of the valve seat, and a negative pressure outlet communicating with the inner cavity is formed in the other side, in the first direction, of the valve seat; an opening communicating with the inner cavity is formed in the side, in the second direction, of the valve seat. One end of the valve body penetrates through the opening and can be movably installed on the valve seat in the second direction, the valve body is provided with an opening position enabling the negative pressure inlet and the negative pressure outlet to be communicated and a closing position enabling the negative pressure inlet and the negative pressure outlet to be separated, and the valve body is provided with a pressure balance groove communicated with external air pressure. And the pressure balance groove is communicated with the negative pressure inlet. According to the negative pressure control valve, the air pressure in the negative pressure pipeline and the external air pressure can be kept balanced.

Description

Technical Field

[0001] The present application belongs to the technical field of on-off control of negative pressure pipelines, and more specifically, to a negative pressure control valve and a negative pressure dust extraction system. Background Art

[0002] The negative pressure control valve is mainly used to control the on-off of the negative pressure pipeline. During laser processing, the workpiece is usually adsorbed through the negative pressure pipeline or the dust generated during the processing is extracted through the negative pressure pipeline.

[0003] However, when the negative pressure control valve in the related art is closed, the negative pressure pipeline cannot automatically return to the room pressure, resulting in a pressure difference between the air pressure inside the negative pressure pipeline and the external air pressure, and the balance cannot be maintained. Utility Model Content

[0004] An embodiment of the present application provides a negative pressure control valve, which can balance the air pressure inside the negative pressure pipeline with the external air pressure.

[0005] The technical solution adopted in the embodiment of the present application is: to provide a negative pressure control valve, including:

[0006] A valve seat, wherein the valve seat is provided with an inner cavity, a negative pressure inlet communicating with the inner cavity is provided on one side of the valve seat along a first direction, a negative pressure outlet communicating with the inner cavity is provided on the other side of the valve seat along the first direction, and an opening communicating with the inner cavity is provided on one side of the valve seat along a second direction;

[0007] a valve body, one end of which passes through the opening and can be movably mounted on the valve seat along the second direction, the valve body having an open position for connecting the negative pressure inlet with the negative pressure outlet and a closed position for isolating the negative pressure inlet from the negative pressure outlet, the valve body being provided with a pressure balancing groove connected with the external air pressure, and when the valve body is in the closed position, the pressure balancing groove is connected with the negative pressure inlet;

[0008] The first direction is arranged at an angle to the second direction.

[0009] Furthermore, the valve body includes a first side edge, the first side edge faces the negative pressure inlet, the pressure balance groove is opened at the first side edge, and when the valve body is in a closed position, the pressure balance groove is at least partially exposed outside the inner cavity, the pressure balance groove is located at one end of the inner cavity and is connected to the negative pressure inlet, and the end of the pressure balance groove exposed outside the inner cavity is connected to the external air pressure.

[0010] Furthermore, the valve body includes a first side edge, the first side edge faces the negative pressure inlet, the pressure balance groove is opened at the first side edge, the valve seat is provided with a through hole, and when the valve body is in a closed position, the pressure balance groove is located in the inner cavity, and one end of the pressure balance groove is connected to the negative pressure inlet, and the other end of the pressure balance groove is connected to the external air pressure through the through hole.

[0011] Furthermore, the valve body includes a first side edge and a second side edge, the first side edge faces the negative pressure inlet, and the second side edge is located on the side away from the opening, the pressure balance groove is opened on the first side edge, and the second side edge is provided with a notch connected to the pressure balance groove, when the valve body is in a closed position, the pressure balance groove is located in the inner cavity, and one end of the pressure balance groove is connected to the negative pressure inlet, and the other end of the pressure balance groove is connected to the external air pressure through the notch.

[0012] Further, the valve body includes a third side edge, the third side edge faces the negative pressure outlet, and the third side edge is provided with the pressure balancing groove.

[0013] The pressure balancing groove located on the third side edge and the pressure balancing groove located on the first side edge are symmetrically arranged with respect to a central axis of the valve body extending along the second direction.

[0014] Furthermore, a ventilation groove is provided on the valve body. When the valve body is in a closed position, the ventilation groove is staggered with the negative pressure inlet or the negative pressure outlet. When the valve body is in an open position, the ventilation groove is connected with the negative pressure inlet and the negative pressure outlet.

[0015] Furthermore, a dust outlet communicating with the inner cavity is provided on a side of the valve seat away from the opening.

[0016] Furthermore, the negative pressure control valve also includes a mounting seat, the valve seat is arranged on the mounting seat, and the mounting seat is provided with an avoidance groove directly facing the dust outlet.

[0017] Furthermore, the negative pressure control valve also includes an air inlet connector and an air outlet connector, the air inlet connector is connected to the negative pressure inlet, and the air outlet connector is connected to the negative pressure outlet.

[0018] Furthermore, the air inlet connector includes a plurality of air inlet connectors, and the plurality of air inlet connectors are arranged at intervals along the third direction.

[0019] The inner cavity includes a plurality of negative pressure inlets, each of which is connected to one of the air inlet connectors.

[0020] The valve body comprises a plurality of valve bodies, each of which is located in one of the inner cavities.

[0021] The gas outlet connector includes one, and the negative pressure outlet of each of the inner cavities is respectively connected to the gas outlet connector;

[0022] or,

[0023] The gas outlet connectors include a plurality of gas outlet connectors, and the negative pressure outlet of each of the inner cavities is connected to one of the gas outlet connectors respectively.

[0024] The third direction is arranged at an angle to the first direction and the second direction respectively.

[0025] An embodiment of the present application also provides a negative pressure dust extraction system, including a negative pressure pipeline, a dust extraction generating device and the negative pressure control valve as described above, wherein the negative pressure pipeline is connected to the negative pressure inlet, and the dust extraction generating device is connected to the negative pressure outlet.

[0026] The beneficial effect of the negative pressure control valve provided in the embodiment of the present application is that: an inner cavity is provided on the valve seat, a negative pressure inlet communicating with the inner cavity is provided on one side of the valve seat along the first direction, a negative pressure outlet communicating with the inner cavity is provided on the other side of the valve seat along the first direction, and an opening communicating with the inner cavity is provided on one side of the valve seat along the second direction; one end of the valve body passes through the opening and is movably mounted on the valve seat along the second direction so that the valve body can be switched between an open position and a closed position, thereby realizing the connection or isolation between the negative pressure inlet and the negative pressure outlet. The valve body is provided with a pressure balancing groove communicating with the external air pressure. When the valve body is in the closed position, the pressure balancing groove is communicated with the negative pressure inlet, so that the air pressure at the negative pressure inlet can be communicated with the external air pressure, that is, the balance of the air pressure at the negative pressure inlet and the external air pressure is achieved. When the negative pressure inlet is connected to the negative pressure pipeline, the air pressure inside the negative pressure pipeline can be balanced with the external air pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 A schematic diagram of the three-dimensional structure of a negative pressure control valve provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of the three-dimensional structure of the negative pressure control valve provided in an embodiment of the present application from another angle;

[0030] Figure 3 A schematic diagram of the explosion structure of the negative pressure control valve provided in an embodiment of the present application;

[0031] Figure 4 A schematic diagram of the three-dimensional structure of the valve seat used in the embodiment of the present application;

[0032] Figure 5 This is a schematic diagram of the three-dimensional structure of the valve body used in the embodiment of the present application.

[0033] Among them, the reference numerals in the figure are:

[0034] 10. Valve seat; 11. Inner cavity; 12. Negative pressure inlet; 13. Negative pressure outlet; 14. Opening; 15. Dust outlet; 20. Valve body; 21. Pressure balance groove; 22. First side edge; 23. Second side edge; 24. Notch; 25. Ventilation groove; 30. Driving mechanism; 40. Mounting seat; 41. Avoidance groove; 50. Air inlet connector; 60. Air outlet connector. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0037] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] See also Figure 1 and Figure 2, the negative pressure control valve provided in the embodiment of the present application is now described. The negative pressure control valve provided in the embodiment of the present application can be used for on-off control of the negative pressure pipeline. Among them, during laser processing, the negative pressure pipeline can be used to adsorb the workpiece or remove the dust generated during the processing.

[0040] The negative pressure control valve provided in the embodiment of the present application includes a valve seat 10 and a valve body 20. Figure 4 As shown, the valve seat 10 is provided with an inner cavity 11, and a negative pressure inlet 12 connected to the inner cavity 11 is provided on one side of the valve seat 10 along the first direction, and the negative pressure inlet 12 is connected to a negative pressure pipeline, and the negative pressure pipeline can be connected to an adsorption platform or a dust hood. A negative pressure outlet 13 connected to the inner cavity 11 is provided on the other side of the valve seat 10 along the first direction, and the negative pressure outlet 13 can be connected to a dust generating device. The dust generating device can be an independent smoke purifier or a public centralized dust extraction pipeline. An opening 14 connected to the inner cavity 11 is provided on one side of the valve seat 10 along the second direction.

[0041] like Figure 1 , Figure 3 As shown, one end of the valve body 20 passes through the opening 14 and can be movably installed on the valve seat 10 along the second direction, that is, one end of the valve body 20 passes through the opening 14 and can be movably accommodated in the inner cavity 11 along the second direction. The valve body 20 has an open position that allows the negative pressure inlet 12 to communicate with the negative pressure outlet 13, and a closed position that separates the negative pressure inlet 12 from the negative pressure outlet 13. The valve body 20 is provided with a pressure balance groove 21 that is connected to the external air pressure on one side of the negative pressure inlet 12. When the valve body 20 is in the closed position, the pressure balance groove 21 is connected to the negative pressure inlet 12, so that the air pressure at the negative pressure inlet 12 can be connected to the external air pressure, that is, the balance of the air pressure at the negative pressure inlet 12 and the external air pressure is achieved. Since the negative pressure inlet 12 is connected to the negative pressure pipeline, the air pressure inside the negative pressure pipeline is kept balanced with the external air pressure. When the negative pressure pipeline is used to connect the adsorption platform, when the valve body 20 is in the closed position, the negative pressure pipeline can be restored to the room pressure, which is convenient for removing the workpiece.

[0042] It is understandable that when the valve body 20 is in the open position, in order to avoid negative pressure leakage in the negative pressure pipeline, the pressure balance groove 21 is disconnected from the negative pressure inlet 12, and the external air pressure cannot enter the negative pressure inlet 12 through the pressure balance groove 21.

[0043] The negative pressure control valve may further include a driving mechanism 30, which is drivingly connected to the valve body 20 to drive the valve body 20 to move along the second direction, so that the valve body 20 switches between the open position and the closed position. By providing the driving mechanism 30, the valve body 20 can move along the second direction, thereby switching the valve body 20 between the open position and the closed position.

[0044] The first direction and the second direction are set at an angle. Specifically, the first direction and the second direction can be set at 90°. Figure 1 , the "first direction" can be used Figure 1 The X-axis in the figure represents the “second direction”. Figure 1 The Z-axis in .

[0045] The negative pressure control valve provided in the embodiment of the present application has an inner cavity 11 formed on the valve seat 10, a negative pressure inlet 12 connected to the inner cavity 11 formed on one side of the valve seat 10 along a first direction, a negative pressure outlet 13 connected to the inner cavity 11 formed on the other side of the valve seat 10 along the first direction, and an opening 14 connected to the inner cavity 11 formed on one side of the valve seat 10 along a second direction; one end of the valve body 20 passes through the opening 14 and is movably installed on the valve seat 10 along the second direction so that the valve body 20 can be switched between an open position and a closed position, thereby realizing the connection or isolation between the negative pressure inlet 12 and the negative pressure outlet 13. The valve body 20 is provided with a pressure balancing groove 21 connected to the external air pressure. When the valve body 20 is in a closed position, the pressure balancing groove 21 is connected to the negative pressure inlet 12, so that the air pressure at the negative pressure inlet 12 can be connected to the external air pressure, that is, the balance between the air pressure at the negative pressure inlet 12 and the external air pressure is achieved. When the negative pressure inlet 12 is connected to a negative pressure pipeline, the air pressure inside the negative pressure pipeline can be balanced with the external air pressure.

[0046] See also Figure 5 The valve body 20 may include a first side edge 22, the first side edge 22 faces the negative pressure inlet 12, and the pressure balance groove 21 is opened at the first side edge 22. When the valve body 20 is in the closed position, the pressure balance groove 21 is at least partially exposed outside the inner cavity 11. One end of the pressure balance groove 21 located in the inner cavity 11 is connected to the negative pressure inlet 12, and the end of the pressure balance groove 21 exposed outside the inner cavity 11 is connected to the external air pressure. By setting the pressure balance groove 21 at the first side edge 22, and making the pressure balance groove 21 at least partially exposed outside the inner cavity 11 when the valve body 20 is in the closed position, the pressure balance groove 21 is located at one end of the inner cavity 11 and is connected to the negative pressure inlet 12, and the end of the pressure balance groove 21 exposed outside the inner cavity 11 is connected to the external air pressure, the air pressure at the negative pressure inlet 12 can be connected to the external air pressure.

[0047] See also Figure 5The valve body 20 may include a first side edge 22, the first side edge 22 faces the negative pressure inlet 12, the pressure balance groove 21 is opened at the first side edge 22, the valve seat 10 is provided with a through hole (not shown in the figure), when the valve body 20 is in the closed position, the pressure balance groove 21 is located in the inner cavity 11, and one end of the pressure balance groove 21 is connected to the negative pressure inlet 12, and the other end of the pressure balance groove 21 is connected to the external air pressure through the through hole. By providing a through hole in the valve seat 10, when the valve body 20 is in the closed position, since the pressure balance groove 21 is located in the inner cavity 11, it can be connected to the external air pressure through the through hole, and the air pressure at the negative pressure inlet 12 can also be connected to the external air pressure.

[0048] See also Figure 5 The valve body 20 may include a first side edge 22 and a second side edge 23, the first side edge 22 faces the negative pressure inlet 12, the second side edge 23 is located at a side away from the opening 14, the pressure balance groove 21 is opened at the first side edge 22, and the second side edge 23 is provided with a notch 24 connected to the pressure balance groove 21. When the valve body 20 is in the closed position, the pressure balance groove 21 is located in the inner cavity 11, and one end of the pressure balance groove 21 is connected to the negative pressure inlet 12, and the other end of the pressure balance groove 21 is connected to the external air pressure through the notch 24. The notch 24 connected to the pressure balance groove 21 is opened by the second side edge 23, when the pressure balance groove 21 is located in the inner cavity 11, it can be connected to the external air pressure through the notch 24, and the air pressure at the negative pressure inlet 12 can also be connected to the external air pressure.

[0049] See also Figure 5 The valve body 20 may include a third side edge (not shown in the figure), the third side edge faces the negative pressure outlet 13, and the third side edge is provided with a pressure balancing groove 21. The pressure balancing groove 21 on the third side edge and the pressure balancing groove 21 on the first side edge 22 are symmetrically arranged about the central axis of the valve body 20 extending along the second direction. That is, the pressure balancing grooves 21 are symmetrically arranged on the first side edge 22 and the third side edge. By arranging the pressure balancing grooves 21 symmetrical to the first side edge 22 on the third side edge, the valve body 20 can be installed in both the positive and negative directions, and the installation is very convenient.

[0050] See also Figure 5, a vent groove 25 may be provided on the valve body 20. When the valve body 20 is in the closed position, the vent groove 25 and the negative pressure inlet 12 or the negative pressure outlet 13 are staggered with each other, and at this time, the negative pressure inlet 12 and the negative pressure outlet 13 can be isolated. When the valve body 20 is in the open position, the vent groove 25 is connected with the negative pressure inlet 12 and the negative pressure outlet 13, and at this time, the negative pressure inlet 12 and the negative pressure outlet 13 can be connected. By providing the vent groove 25 on the valve body 20, the movement stroke of the valve body 20 can be effectively shortened. Of course, it is understandable that the vent groove 25 may not be provided, and the valve body 20 is directly opposite to the negative pressure inlet 12 or the negative pressure outlet 13, and at this time, the negative pressure inlet 12 and the negative pressure outlet 13 can be isolated. By staggering the valve body 20 and the negative pressure inlet 12 and the negative pressure outlet 13, the negative pressure inlet 12 and the negative pressure outlet 13 can be connected.

[0051] See also Figure 2 The valve seat 10 may be provided with a dust outlet 15 on one side away from the opening 14 and connected to the inner cavity 11. Through the provision of the dust outlet 15, dust in the inner cavity 11 can fall through the dust outlet 15, thereby preventing dust from clogging the inner cavity 11 and causing the valve body 20 to fail to work normally.

[0052] See also Figures 2 to 3 The negative pressure control valve may further include a mounting seat 40, which may be connected to an external device so that the negative pressure control valve may be fixed to the external device. The valve seat 10 is disposed on the mounting seat 40, and a avoidance groove 41 is provided on the mounting seat 40, which is directly opposite to the dust outlet 15. The avoidance groove 41 can prevent dust in the inner cavity 11 from falling out of the dust outlet 15 and accumulating on the mounting seat 40.

[0053] See also Figure 1 The negative pressure control valve may further include an air inlet connector 50 and an air outlet connector 60, wherein the air inlet connector 50 is connected to the negative pressure inlet 12, and the air outlet connector 60 is connected to the negative pressure outlet 13. The air inlet connector 50 may be connected to the negative pressure pipeline, and the air outlet connector 60 may be connected to the dust extraction device.

[0054] See also Figure 1 , the air inlet connector 50 may include multiple ones, and the multiple air inlet connectors 50 are arranged at intervals along the third direction. The inner cavity 11 includes multiple ones, and the negative pressure inlet 12 of one inner cavity 11 is respectively connected to one air inlet connector 50. The valve body 20 includes multiple ones, and each valve body 20 is respectively located in one inner cavity 11. The air outlet connector 60 may include one, and the negative pressure inlet 12 of each inner cavity 11 is respectively connected to the air outlet connector 60. Of course, the air outlet connector 60 may also include multiple ones, and the negative pressure inlet 12 of one inner cavity 11 is respectively connected to one air outlet connector 60.

[0055] By setting up multiple air inlet connectors 50 and cooperating with setting up multiple valve bodies 20, compared with setting up one air inlet connector 50 and one valve body 20, while ensuring the same air flow rate, the movement stroke of the valve body 20 can be reduced, thereby shortening the opening and closing time and improving work efficiency.

[0056] The third direction is set at an angle with the first direction and the second direction. Specifically, the first direction and the second direction and the third direction can be set at 90 degrees. Figure 1 , "third direction" can be used Figure 1 The Y-axis represents.

[0057] See also Figure 1 The air inlet connector 50 may include two, and the air outlet connector 60 may include one, that is, the air inlet connector 50 and the air outlet structure are Y-shaped as a whole.

[0058] See also Figure 1 The driving mechanism 30 includes a cylinder, which drives the valve body 20 to move along the second direction. The driving method is simple and the action response is fast. It can be understood that the driving mechanism 30 can also be a motor.

[0059] An embodiment of the present application also provides a negative pressure dust extraction system, including a negative pressure pipeline, a dust extraction generating device and a negative pressure control valve in any of the above embodiments, the negative pressure pipeline is connected to the negative pressure inlet, and the dust extraction generating device is connected to the negative pressure outlet.

[0060] The negative pressure dust extraction system provided in the embodiment of the present application includes the negative pressure control valve in any of the above embodiments, and therefore has the beneficial effects brought by the negative pressure control valve in any of the above embodiments, which will not be elaborated here.

[0061] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A negative pressure control valve, characterized in that: include: A valve seat, wherein the valve seat is provided with an inner cavity, a negative pressure inlet communicating with the inner cavity is provided on one side of the valve seat along a first direction, a negative pressure outlet communicating with the inner cavity is provided on the other side of the valve seat along the first direction, and an opening communicating with the inner cavity is provided on one side of the valve seat along a second direction; and a valve body, one end of which passes through the opening and can be movably mounted on the valve seat along the second direction, the valve body having an open position for connecting the negative pressure inlet with the negative pressure outlet and a closed position for isolating the negative pressure inlet from the negative pressure outlet, the valve body being provided with a pressure balancing groove connected with the external air pressure, and when the valve body is in the closed position, the pressure balancing groove is connected with the negative pressure inlet; The first direction is arranged at an angle to the second direction.

2. The negative pressure control valve according to claim 1, characterized in that: The valve body includes a first side edge, the first side edge faces the negative pressure inlet, the pressure balance groove is opened at the first side edge, when the valve body is in a closed position, the pressure balance groove is at least partially exposed outside the inner cavity, one end of the pressure balance groove located in the inner cavity is connected to the negative pressure inlet, and the end of the pressure balance groove exposed outside the inner cavity is connected to the external air pressure.

3. The negative pressure control valve according to claim 1, characterized in that: The valve body includes a first side edge, the first side edge faces the negative pressure inlet, the pressure balance groove is opened at the first side edge, the valve seat is opened with a through hole, and when the valve body is in a closed position, the pressure balance groove is located in the inner cavity, and one end of the pressure balance groove is connected to the negative pressure inlet, and the other end of the pressure balance groove is connected to the external air pressure through the through hole.

4. The negative pressure control valve according to claim 1, characterized in that: The valve body includes a first side edge and a second side edge, the first side edge faces the negative pressure inlet, and the second side edge is located on a side away from the opening, the pressure balance groove is opened on the first side edge, and the second side edge is provided with a notch connected to the pressure balance groove, when the valve body is in a closed position, the pressure balance groove is located in the inner cavity, and one end of the pressure balance groove is connected to the negative pressure inlet, and the other end of the pressure balance groove is connected to the external air pressure through the notch.

5. The negative pressure control valve according to claim 2, 3 or 4, characterized in that: The valve body comprises a third side edge, the third side edge faces the negative pressure outlet, and the third side edge is provided with the pressure balancing groove. The pressure balancing groove located on the third side edge and the pressure balancing groove located on the first side edge are symmetrically arranged with respect to a central axis of the valve body extending along the second direction.

6. The negative pressure control valve according to any one of claims 1 to 4, characterized in that: A vent groove is provided on the valve body. When the valve body is in a closed position, the vent groove is staggered with the negative pressure inlet or the negative pressure outlet. When the valve body is in an open position, the vent groove is connected with the negative pressure inlet and the negative pressure outlet.

7. The negative pressure control valve according to any one of claims 1 to 4, characterized in that: A dust outlet communicated with the inner cavity is provided on one side of the valve seat away from the opening.

8. The negative pressure control valve according to claim 7, characterized in that: The negative pressure control valve further comprises a mounting seat, the valve seat is arranged on the mounting seat, and an avoidance groove directly facing the dust outlet is opened on the mounting seat.

9. The negative pressure control valve according to any one of claims 1 to 4, characterized in that: The negative pressure control valve also includes an air inlet connector and an air outlet connector, wherein the air inlet connector is communicated with the negative pressure inlet, and the air outlet connector is communicated with the negative pressure outlet.

10. The negative pressure control valve according to claim 9, characterized in that: The air inlet connectors include a plurality of air inlet connectors, which are spaced apart along the third direction. The inner cavity includes a plurality of negative pressure inlets, each of which is connected to one of the air inlet connectors. The valve body comprises a plurality of valve bodies, each of which is located in one of the inner cavities. The gas outlet connector includes one, and the negative pressure outlet of each of the inner cavities is respectively connected to the gas outlet connector; or, The gas outlet connectors include a plurality of gas outlet connectors, and the negative pressure outlet of each of the inner cavities is connected to one of the gas outlet connectors respectively. The third direction is arranged at an angle to the first direction and the second direction respectively.

11. A negative pressure dust extraction system, characterized in that: It comprises a negative pressure pipeline, a dust extraction generating device and the negative pressure control valve according to any one of claims 1 to 10, wherein the negative pressure pipeline is connected to the negative pressure inlet, and the dust extraction generating device is connected to the negative pressure outlet.

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