Negative pressure control valve

Abstract

The utility model relates to a negative pressure control valve which is provided with a valve body and a valve cover, a diaphragm and a first barrier plate are sequentially arranged in the valve body, and the diaphragm and the first barrier plate divide the interior of the valve body into a closed first chamber, a closed second chamber and a closed third chamber; the valve body is further provided with an output port communicated with the third cavity and a negative pressure air input port communicated with the second cavity. A positive pressure air input port is formed in the bottom wall of the valve body, and the area close to the bottom wall of the valve body is a fourth cavity; a negative pressure hole is formed in the first barrier plate; a positive pressure hole is formed in the bottom wall of the valve body; the diaphragm is provided with a valve rod; the valve rod is provided with a first blocking piston and a second blocking piston. An output channel of the electromagnetic valve is communicated with the first cavity, a first input channel of the electromagnetic valve is communicated with positive pressure air, and a second input channel of the electromagnetic valve is communicated with the negative pressure air input port. According to the utility model, connection and disconnection are realized by utilizing negative pressure air, so that the problems of high power demand and large power consumption caused by direct use of an electromagnetic valve are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum suction cups, in particular to a negative pressure control valve. Background Art

[0002] Vacuum suction cups are widely used in industrial production due to their ability to quickly absorb and release objects, and are mainly used in object handling devices. When sucking objects, suction is achieved by introducing negative pressure air, while when releasing objects, it is achieved by positive pressure air. The switching control of negative and positive pressure air usually relies on a solenoid valve installed on the suction cup. The solenoid valve controls the working state of the suction cup by switching the input of negative and positive pressure air. However, this also means that the solenoid valve must overcome the suction force of negative pressure air on its valve core when switching. Therefore, the solenoid valve must have a certain power to overcome the suction force of negative pressure air, especially in the case of large flow and negative pressure, the power demand of the solenoid valve is higher, resulting in higher power consumption. Utility Model Content

[0003] To this end, the utility model provides a negative pressure control valve, which mainly solves the technical problem of large power consumption of the electromagnetic valve of the vacuum suction cup controlling negative pressure and positive pressure air in the prior art.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A negative pressure control valve comprises a valve body with a box-like structure having a top opening; a valve cover is provided on the top of the valve body for closing the top of the valve body; a solenoid valve is provided on the top of the valve cover; an elastic and airtight diaphragm is provided on the upper part of the valve body; a closed first chamber is formed between the diaphragm and the valve cover; a first blocking plate is provided in the valve body below the diaphragm; a closed second chamber is formed between the first blocking plate and the diaphragm, and a closed third chamber is formed between the first blocking plate and the diaphragm and the bottom wall of the valve body; an output port connected to the third chamber is provided on the left side wall of the valve body for outputting positive and negative pressure air, a negative pressure air input port is provided on the right side wall of the valve body for inputting negative pressure air, and a positive pressure air input port is provided on the bottom wall of the valve body for inputting positive pressure air; the area of ​​the positive pressure air input port close to the bottom wall of the valve body is a fourth chamber; a through negative pressure hole is provided on the top surface of the first blocking plate; the valve A through positive pressure hole is provided on the top surface of the bottom wall of the body; the diaphragm is provided with a valve stem; the bottom end of the valve stem passes through the second chamber, the negative pressure hole, the third chamber, and the positive pressure hole and extends to the fourth chamber respectively; the valve stem body of the second chamber is provided with a first blocking piston for blocking or opening the negative pressure hole; the valve stem body of the fourth chamber is provided with a second blocking piston for blocking or opening the positive pressure hole; the top surface of the valve cover is provided with a through second connecting hole and a third connecting hole respectively; a through first connecting hole is provided on the inner wall of the negative pressure air input port; the solenoid valve is a three-way solenoid valve, and its first input channel is connected to the positive pressure air; one end of the second connecting hole is connected to the first connecting hole, and the other end is connected to the second input channel of the solenoid valve; one end of the third connecting hole is connected to the output channel of the solenoid valve, and the other end is connected to the first chamber. Under the action of the solenoid valve, the first chamber is connected to the positive pressure air or to the negative pressure air input port.

[0006] Optionally, the diaphragm is made of rubber.

[0007] Preferably, the bottom of the first blocking piston is conical; the upper hole wall of the negative pressure hole is provided with a conical first section; the conical surface of the bottom of the first blocking piston can fit with the first section.

[0008] Preferably, the upper portion of the second blocking piston is in an inverted cone shape; the lower hole wall of the positive pressure hole is provided with an inverted cone-shaped second section surface; the upper conical surface of the second blocking piston can fit with the second section surface.

[0009] Preferably, a limiting disk is provided on the top surface of the diaphragm.

[0010] Preferably, a through vent hole is provided on the top surface of the limiting plate.

[0011] Preferably, the positive pressure air input port below the second blocking piston is provided with a filter disk; the filter disk is used to block the positive pressure air input port; and a plurality of through filter holes are provided on the top surface of the filter disk.

[0012] Optionally, the first blocking piston and the second blocking piston are both made of rubber.

[0013] The utility model has at least the following beneficial effects:

[0014] A valve body and a valve cover are provided, and a diaphragm and a first blocking plate are arranged in the valve body in sequence, which divide the valve body into a closed first chamber, a second chamber and a third chamber; an output port connected to the third chamber is arranged on the left side of the valve body, a negative pressure air input port connected to the second chamber is arranged on the right side, a positive pressure air input port is arranged on the bottom wall of the valve body, and the area of ​​the positive pressure air input port near the bottom wall of the valve body is the fourth chamber; a negative pressure hole is opened on the first blocking plate; a positive pressure hole is opened on the bottom wall of the valve body; a valve stem is arranged on the diaphragm; the valve stem body of the second chamber is provided with a first blocking piston, and the valve body body of the fourth chamber is provided with a second blocking piston; a three-way solenoid valve is also provided, whose output channel is connected to the first chamber through a third connecting hole, whose first input channel is connected to the positive pressure air, and whose second input channel is connected to the negative pressure air input port through the second connecting hole and the first connecting hole. When adsorbing an object, the electromagnetic connects negative pressure air to the first chamber, and the diaphragm is adsorbed and moved upward by the negative pressure air in the first chamber, driving the valve stem upward, the first blocking piston opens the negative pressure hole, and the second blocking piston blocks the positive pressure hole. The negative pressure air enters the third chamber from the second chamber through the negative pressure hole, flows out from the output port, and adsorbs the object; when releasing the object, the electromagnetic connects positive pressure air to the first chamber, and the diaphragm is adsorbed and moved downward by the negative pressure air in the second chamber, driving the valve stem downward, the first blocking piston blocks the negative pressure hole, and the second blocking piston opens the positive pressure hole. The positive pressure air enters the third chamber from the fourth chamber through the positive pressure hole, flows out from the output port, and releases the object. The control valve of the present application switches the connection and closing of negative pressure air by moving the valve stem, and the movement of the valve stem is achieved by the adsorption of the negative pressure air on the diaphragm, that is, the negative pressure air itself is used to achieve connection and closing, avoiding the problem of higher power demand of the solenoid valve caused by the adsorption force of the negative pressure air on the solenoid valve core when directly using the solenoid valve for switching, resulting in higher power consumption. At present, the solenoid valve of the vacuum suction cup requires at least 18W of power, while the solenoid valve of the control valve of the present application only requires 2.3W of power; at the same time, the movement of the valve stem of the present application is achieved by the adsorption of the negative pressure air on the diaphragm, and the response speed during switching is fast.

[0015] It can be seen that the negative pressure control valve of the utility model has the advantages of fast response speed and power saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly explain the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the present invention. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other drawings can be derived from the provided drawings without creative work.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0018] Figure 1 This is a schematic diagram of the structure of a negative pressure control valve of the utility model;

[0019] Figure 2 This is an accessory of a negative pressure control valve of the utility model. Figure 1 Schematic diagram of the upward direction;

[0020] Figure 3 This is a top view of a negative pressure control valve of the utility model;

[0021] Figure 4 This is an accessory of a negative pressure control valve of the utility model. Figure 3 AA section view of the state;

[0022] Figure 5 This is an accessory of a negative pressure control valve of the utility model. Figure 3 Schematic diagram of the valve body in cross-section along AA direction;

[0023] Figure 6 This is an accessory of a negative pressure control valve of the utility model. Figure 5 Schematic diagram of the upward direction;

[0024] Figure 7 This is an accessory of a negative pressure control valve of the utility model. Figure 3 BB section view of the state;

[0025] Figure 8 This is a schematic diagram of the structure of a valve stem, a first blocking piston and a second blocking piston of a negative pressure control valve of the utility model;

[0026] Description of reference numerals:

[0027] 1. Valve body; 101. First chamber; 102. Second chamber; 103. Third chamber; 104. Fourth chamber; 105. First blocking plate; 1051. First section; 106. Bottom wall of valve body; 1061. Second section; 107. First connecting hole; 2. Solenoid valve; 3. Negative pressure air input port; 4. Output port; 5. Positive pressure air input port; 6. Valve cover; 601. Second connecting hole; 602. Third connecting hole; 7. Diaphragm; 8. Valve stem; 9. Filter disc; 901. Filter hole; 10. Limit disc; 1001. Air vent; 11. First blocking piston; 12. Second blocking piston. DETAILED DESCRIPTION

[0028] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0029] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0030] The terms such as "upper", "lower", "left", "right", "middle", etc. used in this application are usually used to facilitate intuitive understanding by comparing with the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as the scope of this application.

[0031] The utility model provides a negative pressure control valve, such as Figures 1 to 8As shown, a valve body 1 is provided, and the valve body 1 is a box-shaped structure with a hollow interior. For the convenience of processing and installation, the top opening thereof is provided. A valve cover 6 is provided on the top of the valve body 1 to close the top of the valve body 1. In some applications, the valve cover 6 can be an integral structure with the valve body 1, an integrally formed structure. A solenoid valve 2 is provided on the top of the valve cover 6, and an elastic and airtight diaphragm 7 is provided on the upper part of the valve body 1, such as made of rubber material, or other materials. A sealed first chamber 101 is formed between the diaphragm 7 and the valve cover 6, and a first blocking plate 105 is provided in the valve body 1 below the diaphragm 7. A sealed second chamber 102 is formed between the first blocking plate 105 and the diaphragm 7, and a sealed third chamber 103 is formed between the first blocking plate 105 and the valve body bottom wall 106 of the valve body 1. The left wall of the valve body 1 is provided with an output port 4 connected to the third chamber 103, and positive and negative pressure air is output from this port; the right wall of the valve body 1 is provided with a negative pressure air input port 3 connected to the second chamber 102, and negative pressure air is input from this port; the bottom wall 106 of the valve body is provided with a positive pressure air input port 5, and positive pressure air is input from this port. The area near the bottom wall 106 of the valve body is the fourth chamber 104. A through negative pressure hole is opened on the top surface of the first blocking plate 105, and the negative pressure hole conducts the second chamber 102 and the third chamber 103; the top surface of the bottom wall 106 of the valve body is provided with a through positive pressure hole, and the positive pressure hole conducts the fourth chamber 104 and the third chamber 103. The diaphragm 7 is provided with a valve stem 8, and the bottom end of the valve stem 8 passes through the second chamber 102, the negative pressure hole, the third chamber 103, and the positive pressure hole respectively and extends to the fourth chamber 104. The valve stem 8 of the second chamber 102 is provided with a first blocking piston 11 for blocking or opening the negative pressure hole; the valve stem 8 of the fourth chamber 104 is provided with a second blocking piston 12 for blocking or opening the positive pressure hole, and the first blocking piston 11 and the second blocking piston 12 are both made of rubber. A through second connecting hole 601 and a through third connecting hole 602 are respectively provided on the top surface of the valve cover 6; a through first connecting hole 107 is provided on the inner wall of the negative pressure air input port 3. The solenoid valve 2 selects a three-way solenoid valve, such as a two-phase three-way solenoid valve, so that its first input channel is connected to the positive pressure air; one end of the second connecting hole 601 is connected to the first connecting hole 107, and the other end is connected to the second input channel of the solenoid valve 2; one end of the third connecting hole 602 is connected to the output channel of the solenoid valve 2, and the other end is connected to the first chamber 101. In this way, under the action of the electromagnetic valve 2 , the first chamber 101 is connected with the positive pressure air or connected with the negative pressure air input port 3 , so that the positive pressure air or negative pressure air is introduced into the first chamber 101 .

[0032] Preferably, in order to improve the sealing performance of the first blocking piston 11 on the negative pressure hole, the bottom of the first blocking piston 11 is designed to be conical. At the same time, a conical first section 1051 is opened on the upper hole wall of the negative pressure hole. The conical surface at the bottom of the first blocking piston 11 fits with the first section 1051 to improve the sealing performance of the blockage.

[0033] Preferably, in order to improve the sealing performance of the second blocking piston 12 for blocking the negative pressure hole, the upper part of the second blocking piston 12 is designed to be an inverted cone. At the same time, an inverted cone-shaped second section 1061 is opened on the lower hole wall of the positive pressure hole, and the upper conical surface of the second blocking piston 12 fits with the second section 1061 to improve the sealing performance of the blockage.

[0034] Preferably, a limit plate 10 is provided on the top surface of the diaphragm 7 to facilitate the fixed installation of the diaphragm 7 and prevent the diaphragm 7 from being separated from the valve stem 8. Specifically, the top of the valve stem 8 can pass through the diaphragm 7, and the limit plate 10 is installed on the protruding part of the valve stem 8.

[0035] Preferably, in order to prevent the limiting plate 10 from affecting the negative pressure air adsorption membrane 7 , a through vent hole 1001 is provided on the top surface of the limiting plate 10 .

[0036] Preferably, the positive-pressure air of the vacuum suction cup generally utilizes the outside air at the place of use. In order to prevent foreign matter in the outside air from entering the control valve of the present application, a filter disc 9 is provided at the positive-pressure air input port 5 below the second blocking piston 12; the filter disc 9 blocks the positive-pressure air input port 5. In order to facilitate production and installation, the bottom of the valve stem 8 can be extended into the positive-pressure air input port 5, and the filter disc 9 is installed at the bottom of the valve stem 8. A plurality of through filter holes 901 are provided on the top surface of the filter disc 9.

[0037] Here’s how this application works:

[0038] When adsorbing an object, the solenoid valve switches to connect the second input channel with the output channel, and negative pressure air is input from the negative pressure air input port. The negative pressure air enters the first chamber from the first connecting hole, the second connecting hole, and the third connecting hole. Under the action of the negative pressure air, the diaphragm is adsorbed upward, driving the valve stem upward, and the first blocking piston leaves the negative pressure hole, and the negative pressure hole is opened. At the same time, the first blocking piston blocks the positive pressure hole, and the negative pressure air enters the third chamber from the second chamber through the negative pressure hole, and flows out from the output port to adsorb the object;

[0039] When releasing the object, the solenoid valve switches to connect the first input channel with the output channel. At the moment of connection, the positive-pressure air connected to the first input channel enters the first chamber through the third connecting hole, and the negative-pressure air in the first chamber is quickly released, and the diaphragm rebounds and moves downward. At the same time, the diaphragm continues to move downward under the adsorption of the negative-pressure air in the second chamber, driving the valve stem downward, and the first blocking piston blocks the negative-pressure hole. At the same time, the second blocking piston opens the positive-pressure hole, and the positive-pressure air enters the third chamber from the fourth chamber through the positive-pressure hole, and flows out from the output port to release the object.

[0040] The above is a relatively specific and detailed description of the present application through general description and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not deviate from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the scope of protection of the claims of the present application.

Claims

1. A negative pressure control valve, characterized in that: The invention comprises a valve body (1) of a box-shaped structure with an opening at the top; a valve cover (6) is provided on the top of the valve body (1) for closing the top of the valve body (1); a solenoid valve (2) is provided on the top of the valve cover (6); an elastic and airtight diaphragm (7) is provided on the upper part of the valve body (1); a sealed first chamber (101) is formed between the diaphragm (7) and the valve cover (6); a first blocking plate (105) is provided in the valve body (1) below the diaphragm (7); a sealed second chamber (102) is formed between the first blocking plate (105) and the diaphragm (7) and is in contact with the bottom of the valve body (1); A closed third chamber (103) is formed between the valve body and the wall (106); the left side wall of the valve body (1) is provided with an output port (4) connected to the third chamber (103) for outputting positive and negative pressure air; the right side wall of the valve body (1) is provided with a negative pressure air input port (3) connected to the second chamber (102) for inputting negative pressure air; the bottom wall (106) of the valve body is provided with a positive pressure air input port (5) for inputting positive pressure air; the area near the bottom wall (106) of the valve body of the positive pressure air input port (5) is the fourth chamber (104); the top surface of the first blocking plate (105) is provided with a through negative pressure hole; the valve body A through positive pressure hole is provided on the top surface of the bottom wall (106); the diaphragm (7) is provided with a valve stem (8); the bottom end of the valve stem (8) respectively passes through the second chamber (102), the negative pressure hole, the third chamber (103), and the positive pressure hole to extend to the fourth chamber (104); the valve stem (8) body of the second chamber (102) is provided with a first blocking piston (11) for blocking or opening the negative pressure hole; the valve stem (8) body of the fourth chamber (104) is provided with a second blocking piston (12) for blocking or opening the positive pressure hole; the top surface of the valve cover (6) is respectively provided with a through second connecting hole (601) and a through third connecting hole ( 602); a through first connecting hole (107) is provided on the inner wall of the negative pressure air input port (3); the solenoid valve (2) is a three-way solenoid valve, and its first input channel is connected to the positive pressure air; one end of the second connecting hole (601) is connected to the first connecting hole (107), and the other end is connected to the second input channel of the solenoid valve (2); one end of the third connecting hole (602) is connected to the output channel of the solenoid valve (2), and the other end is connected to the first chamber (101), and under the action of the solenoid valve (2), the first chamber (101) is connected to the positive pressure air or the negative pressure air input port (3).

2. A negative pressure control valve according to claim 1, characterized in that: The diaphragm (7) is made of rubber.

3. A negative pressure control valve according to claim 1, characterized in that: The bottom of the first blocking piston (11) is conical; the upper hole wall of the negative pressure hole is provided with a conical first section (1051); the conical surface at the bottom of the first blocking piston (11) can fit with the first section (1051).

4. A negative pressure control valve according to claim 3, characterized in that: The upper portion of the second blocking piston (12) is in the shape of an inverted cone; the lower hole wall of the positive pressure hole is provided with an inverted cone-shaped second section (1061); the upper conical surface of the second blocking piston (12) can fit with the second section (1061).

5. A negative pressure control valve according to claim 1, characterized in that: A limiting plate (10) is provided on the top surface of the diaphragm (7).

6. A negative pressure control valve according to claim 5, characterized in that: The top surface of the limiting plate (10) is provided with a through vent hole (1001).

7. A negative pressure control valve according to claim 1, characterized in that: The positive pressure air input port (5) below the second blocking piston (12) is provided with a filter disc (9); the filter disc (9) is used to block the positive pressure air input port (5); and a plurality of through filter holes (901) are provided on the top surface of the filter disc (9).

8. The negative pressure control valve according to claim 1, characterized in that: The first blocking piston (11) and the second blocking piston (12) are both made of rubber.

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