Vacuum check valve

Abstract

The utility model provides a vacuum check valve which comprises a check valve body, the check valve body comprises a first body, the top of the first body is provided with a second body, the bottom of the first body is provided with a third body, the top of the second body is provided with a first air vent, and the bottom of the third body is provided with a second air vent. A pressure breaking channel is formed in one side of the diametral plane of the second main body, a supporting frame is arranged between the first main body and the third main body, a stabilizing sleeve is arranged in the center of the supporting frame, a valve rod is movably arranged in the stabilizing sleeve, an elastic supporting piece is arranged on the valve rod in a sleeving mode, and a valve element is arranged at the top of the valve rod; the edge of the top end of the valve element is sleeved with a valve element sealing gasket. The stable sleeve and the elastic supporting piece act on the valve rod, so that the stability of the valve rod and the valve element is better, the pressure maintaining effect is better, external atmosphere is introduced through the pressure breaking channel, the intensity of pressure in the cavity of the check valve body is increased, negative pressure is damaged (a workpiece is blown off), and use is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic components, in particular to a vacuum check valve. Background Art

[0002] A vacuum check valve is a valve used in a vacuum system. Its main function is to prevent the gas in the vacuum system from flowing back. Its working principle is based on the principle of fluid flow dynamics.

[0003] When the positive pressure gas source of the existing vacuum check valve is closed, the vacuum state in the vacuum check valve cavity cannot be maintained for a long time, resulting in the adsorption of objects being easily loosened, and the vacuum state inside the check valve body cannot be freely destroyed, resulting in inconvenience in use. Utility Model Content

[0004] The utility model provides a vacuum check valve to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A vacuum check valve comprises a check valve body, wherein the check valve body comprises a first body, a second body is provided on the top of the first body, a third body is provided on the bottom of the first body, a first vent is provided on the top of the second body, a second vent is provided on the bottom of the third body, a pressure-breaking channel is provided on one side of the diameter surface of the second body, a support frame is provided between the first body and the third body, a stabilizing sleeve is provided at the center of the support frame, a valve stem is movably provided in the stabilizing sleeve, an elastic supporting member is mounted on the valve stem, a valve core is provided on the top of the valve stem, and a valve core sealing gasket is mounted on the top edge of the valve core.

[0007] Preferably, a trachea joint is installed in the pressure breaking channel.

[0008] Preferably, the elastic support member adopts a spring structure with a small upper end and a large lower end.

[0009] Preferably, an O-ring is provided at the connection between the first body and the second body and the third body.

[0010] Beneficial Effects

[0011] The above one or more technical solutions in a vacuum check valve provided by the embodiment of the utility model have at least one of the following technical effects:

[0012] Through the above technical scheme, the utility model acts on the valve stem through the stabilizing sleeve and the elastic support member, so that the valve stem and the valve core are more stable and there will be no air leakage, thereby achieving a better pressure maintaining effect. When the positive pressure source is closed, the vacuum state inside the check valve body will not cause air leakage, thereby improving the overall reliability. The outside atmosphere is introduced through the pressure-breaking channel, so that the pressure in the cavity of the check valve body is increased to destroy the negative pressure (blow off the workpiece), thereby facilitating the destruction of the vacuum state inside the check valve body, and making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the workpiece adsorption state of the utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the blown-off workpiece state of the utility model;

[0017] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0018] 1. Check valve body; 2. First body; 3. Second body; 4. Third body; 5. Vent 1; 6. Vent 2; 7. Pressure relief channel; 8. Support frame; 9. Stabilizing sleeve; 10. Valve stem; 11. Elastic supporting member; 12. Valve core; 13. Valve core sealing gasket; 14. Air pipe joint. DETAILED DESCRIPTION

[0019] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left" and "right" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] like Figure 1-4 As shown, it is a structural schematic diagram of a vacuum check valve in a preferred embodiment of the utility model;

[0023] In this embodiment, a check valve body 1 is included, and the check valve body 1 includes a first body 2, a second body 3 is provided on the top of the first body 2, and a third body 4 is provided on the bottom of the first body 2. The first body 2, the second body 3, and the third body 4 are all hollow structures. The first body 2, the second body 3, and the third body 4 are connected. A vent 1 5 is provided on the top of the second body 3, and the vent 1 5 is used to adsorb objects. A vent 2 6 is provided on the bottom of the third body 4, and the vent 2 6 is used to connect to a vacuum generator. A pressure-breaking channel 7 is provided on one side of the radial surface of the second body 3, and the pressure-breaking channel 7 is used for external gas to enter the second body 3, thereby destroying the vacuum negative pressure state inside the second body 3. A support frame 8 is provided between the first main body 2 and the third main body 4, and a stabilizing sleeve 9 is provided at the center of the support frame 8. The stabilizing sleeve 9 is extended along the center line direction of the support frame 8. A valve stem 10 is movably provided in the stabilizing sleeve 9, and the valve stem 10 can slide back and forth along the stabilizing sleeve 9. An elastic support member 11 is mounted on the valve stem 10, and the elastic support member 11 provides elastic supporting force and reset force for the valve stem 10 and the valve core 12. A valve core 12 is provided on the top of the valve stem 10, and the valve core 12 abuts against the bottom of the second main body 3. A valve core sealing gasket 13 is mounted on the top edge of the valve core 12, and the valve core sealing gasket 13 improves the sealing effect of the contact between the valve core 12 and the bottom of the second main body 3.

[0024] In this embodiment, a trachea connector 14 is installed in the pressure-breaking channel 7, and the trachea connector 14 is used to connect an electric control valve, through which the outside air is introduced into the check valve body 1 via the pressure-breaking channel 7 to achieve a pressure-breaking effect.

[0025] In this embodiment, the elastic support member 11 adopts a spring structure with a small upper end and a large lower end. Since the lower end is larger, the spring can provide more stable support when under pressure. Compared with springs of uniform diameter, this design can store more elastic energy, that is, under the same deformation conditions, a spring with a small upper end and a large lower end can store more energy. This design allows the spring to provide a more appropriate elastic response when facing loads of different sizes. Since the force-bearing part of the spring is mainly concentrated at the lower end, by increasing the diameter of the lower end, the stress can be effectively dispersed to avoid the situation where stress concentration causes fracture, thereby better ensuring the stability of the valve stem 10 and the valve core 12.

[0026] In this embodiment, an O-ring is provided at the connection between the first body 2 and the second body 3 and the third body 4, so as to enhance the sealing effect at the connection between the first body 2 and the second body 3 and the third body 4.

[0027] Working principle of this utility model:

[0028] When the gas flow direction in the vacuum system is consistent with the opening direction of the check valve body 1, the check valve body 1 will open to allow gas to pass. At this time, the valve stem 10 and the valve core 11 of the check valve body 1 move downward vertically under the action of the positive pressure gas pressure to maintain the open state (adsorbing the workpiece). Figure 3 At this time, close the positive pressure gas source to keep the relative vacuum state in the cavity of the check valve body 1 (continue to maintain the workpiece adsorption state). Figure 3 The outside atmosphere is introduced through the pressure-breaking channel 7 to increase the pressure in the cavity of the check valve body 1 to break the negative pressure (blow off the workpiece). Figure 4 , thereby facilitating the destruction of the vacuum state inside the check valve body 1.

[0029] The vacuum check valve of the utility model has a mounting method, a connection method or a setting method which are all common mechanical methods and can be implemented as long as the beneficial effects can be achieved.

[0030] Technologies not described in detail in the present invention are all well-known technologies. Those skilled in the art can easily implement the present invention based on understanding this specification, and the contents shown in the drawings are part of this specification.

[0031] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. A vacuum check valve, comprising a check valve body (1), characterized in that: The check valve body (1) comprises a first body (2), a second body (3) is arranged on the top of the first body (2), a third body (4) is arranged on the bottom of the first body (2), a vent hole (1) is arranged on the top of the second body (3), a vent hole (2) is arranged on the bottom of the third body (4), a pressure-breaking channel (7) is arranged on one side of the radial surface of the second body (3), a support frame (8) is arranged between the first body (2) and the third body (4), a stabilizing sleeve (9) is arranged at the center of the support frame (8), a valve stem (10) is movably arranged in the stabilizing sleeve (9), an elastic supporting member (11) is mounted on the valve stem (10), a valve core (12) is arranged on the top of the valve stem (10), and a valve core sealing gasket (13) is mounted on the top edge of the valve core (12).

2. A vacuum check valve according to claim 1, characterized in that: A trachea joint (14) is installed in the pressure-breaking channel (7).

3. A vacuum check valve according to claim 1, characterized in that: The elastic support member (11) adopts a spring structure with a small upper end and a large lower end.

4. A vacuum check valve according to claim 1, characterized in that: An "O"-shaped sealing ring is provided at the connection between the first body (2) and the second body (3) and the third body (4).

Images