Diaphragm valve

Abstract

The utility model discloses a diaphragm valve which comprises a valve body, a driving piece arranged on the valve body and a driving rod arranged on the driving piece. The valve body comprises a lower valve seat and an upper valve seat, and a pressing column and a diaphragm are arranged between the upper valve seat and the lower valve seat. The diaphragm is extruded by the pressing column or is separated from the pressing column, so that a medium flows in from an inlet formed in the lower valve seat and flows out from an outlet; when the driving rod applies pressure to the pressing column, the diaphragm is promoted to block the communication between the inlet and the outlet; the driving rod is separated from the pressing column, and the pressure of a medium is utilized to promote the diaphragm to jack up the pressing column to move upwards, so that communication between the inlet and the outlet is completed. The lower end of the driving rod is arranged to be conical, and the conical driving rod is used for promoting the pressing column to move downwards, so that the pressing column is pressed downwards and stressed uniformly, and the problem that the upper end face of the inlet is difficult to be completely sealed by the diaphragm due to non-uniform stress of the pressing surface of the pressing column caused by a cylindrical driving rod is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rubber valves, in particular to a diaphragm valve. Background Art

[0002] Through searching, it is found that the prior art with patent number: CN205877371U has the following general scheme, namely: it includes a cylinder, an upper valve body and a lower valve body, the cylinder is fixedly connected to the upper valve body by bolts, the upper valve body is fixedly connected to the lower valve body by bolts, the cylinder is equipped with an air inlet and a muffler, one end of the cylinder is threadedly equipped with a cylinder push rod, the cylinder push rod passes through the cavities of the upper valve body and the lower valve body, the cylinder push rod is sleeved with a spring on the upper valve body section, and the end of the cylinder push rod is connected with a steel ball; the upper valve body is provided with a feed inlet, a sealing diaphragm is designed on the connecting surface of the upper valve body and the cylinder push rod, the lower valve body is designed with a discharge port, and a gasket is provided at the contact hole between the upper valve body and the lower valve body.

[0003] Although it has a simple structure, reduces the friction between the valve stem or steel ball and the sealing material, has a good sealing effect, can effectively prevent material overflow, and has strong corrosion resistance, greatly extending the life of the product. However, in actual use, the gasket and steel ball inside the valve body are completely immersed in glue, affecting the flow rate of the medium; secondly, a larger space is required between the diaphragm and the steel ball, which leads to a larger volume of the valve body; Utility Model Content

[0004] The purpose of the utility model is to provide a diaphragm valve to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a diaphragm valve, including a valve body, a driving member arranged on the valve body, and a driving rod arranged on the driving member; the valve body includes a lower valve seat and an upper valve seat, and a pressure column and a diaphragm are arranged between the upper valve seat and the lower valve seat; the pressure column squeezes the diaphragm or separates from the diaphragm, so that the medium flows in from the inlet provided on the lower valve seat and flows out through the outlet provided on the lower valve seat. When the driving rod applies pressure to the pressure column, the diaphragm is prompted to block the connection between the inlet and the outlet; the driving rod is separated from the pressure column, so that the pressure of the medium is used to prompt the diaphragm to lift the pressure column and move upward to complete the connection between the inlet and the outlet.

[0006] As a preferred technical solution of the utility model: a first pressure-bearing surface and a second pressure-bearing surface are provided in the middle of the lower valve seat; the upper valve seat presses the outer edge of the diaphragm against the second pressure-bearing surface through a protrusion provided thereon, and the pressure column causes the middle of the diaphragm to contact the first pressure-bearing surface.

[0007] As a preferred technical solution of the present utility model: an annular cavity connected to the outflow port is further provided between the first pressure-bearing surface and the second pressure-bearing surface.

[0008] As a preferred technical solution of the utility model: the end of the driving rod facing the valve seat is configured to be conical.

[0009] As a preferred technical solution of the utility model: a limiting portion is further provided inside the upper valve seat, and the limiting portion limits the upward movement distance of the pressure column.

[0010] As a preferred technical solution of the utility model: an overflow hole is also provided on the upper valve seat.

[0011] As a preferred technical solution of the utility model: a muffler is also provided on the driving member, and the driving rod is movably mounted on the driving member.

[0012] By adopting the above technical solution, the utility model has the following beneficial effects: 1. Since a diaphragm is installed inside the valve seat and the diaphragm is used to move up and down at the inlet, the flow of the medium can be realized and the medium can be blocked, and the diaphragm is in contact with the medium on one side when realizing the above actions, so the resistance when the medium flows out is small;

[0013] 2. The opening of the diaphragm is completely dependent on the pressure of the medium, so the valve body does not require additional mechanical structure during the opening process, thereby simplifying the internal structure of the valve body to reduce the volume of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the exploded structure of the valve body and the driving member of the utility model;

[0015] Figure 2 This is a front structural schematic diagram of the valve body and the driving component of the utility model after being decomposed;

[0016] Figure 3 This is a front structural schematic diagram of the valve body of the utility model;

[0017] Figure 4 For this utility model Figure 3 Schematic diagram of the cross-sectional structure at AA in the middle;

[0018] Figure 5 This is a schematic diagram of the exploded structure of the valve seat of the utility model;

[0019] Figure 6 It is a schematic diagram of the cross-sectional structure of the lower valve seat of the utility model;

[0020] Figure 7 It is a schematic diagram of the cross-sectional structure of the upper valve seat of the utility model.

[0021] In the figure: 1. driving member; 2. muffler; 3. valve seat; 30. lower valve seat; 31. upper valve seat; 32. pressure column; 33. diaphragm; 34. inlet; 35. protrusion; 36. overflow hole; 37. annular cavity; 38. outflow port; 39. limiting part; 310. first pressure-bearing surface; 311. second pressure-bearing surface; 4. driving rod. DETAILED DESCRIPTION

[0022] Embodiments of the present utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present utility model, and should not be construed as limitations on the present utility model. In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "upper surface", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 construed as a limitation on the present utility model.

[0023] See also Figure 1-7 The utility model provides an embodiment: a diaphragm valve, including a valve body 3, a driving member 1 arranged on the valve body 3, and a driving rod 4 arranged on the driving member 1; the valve body 3 includes a lower valve body 30 and an upper valve body 31, and a pressure column 32 and a diaphragm 33 are provided between the upper valve body 31 and the lower valve body 30; the diaphragm 33 is squeezed or separated from the diaphragm 33 by the pressure column 32, so that the medium flows in from the inlet 34 provided on the lower valve body 30, and flows out through the outlet 38 provided on the lower valve body 30.

[0024] In summary, when the driving rod 4 applies pressure to the pressure column 32, the diaphragm 33 is prompted to block the connection between the inlet 34 and the outlet 38; the driving rod 4 is separated from the pressure column 32, so that the pressure of the medium is used to prompt the diaphragm 33 to lift the pressure column 32 and move it upward, so as to complete the connection between the inlet 34 and the outlet 38.

[0025] Based on this, by installing the diaphragm 33 inside the valve body 3 and using the diaphragm 33 to move up and down at the inlet 34, the flow of the medium and the blocking of the medium can be achieved, and the diaphragm 33 is in contact with the medium on one side when achieving the above-mentioned actions, so the resistance when the medium flows out is small; at the same time, the opening of the diaphragm 33 completely depends on the pressure of the medium, so that the valve body does not need an additional mechanical structure during the opening process, so the internal structure of the valve body 3 can be simplified to reduce the volume of the valve body 3. In addition, the device also has the advantages of simple structure, easy disassembly, easy maintenance, and long service life.

[0026] Specifically, a first pressure-bearing surface 310 and a second pressure-bearing surface 311 are provided in the middle of the lower valve body 30; the upper valve body 31 presses the outer edge of the diaphragm 33 against the second pressure-bearing surface 311 through the protrusion 35 provided thereon, and the pressure column 32 causes the middle of the diaphragm 33 to contact the first pressure-bearing surface 310.

[0027] In the above manner, the outer edge of the diaphragm 33 is pressed against the second pressure-bearing surface 311 by the protrusion 35, so that the medium can be prevented from flowing into the upper valve body 31; at the same time, the diaphragm 33 is squeezed onto the first pressure-bearing surface 310 by the pressure column 32, so that the flow of the medium can be prevented; conversely, when the driving member 1 does not apply pressure, the medium uses its own pressure to push open the diaphragm 33, so that the normal flow of the medium can be achieved.

[0028] In addition, the diaphragm 33 is composed of a rubber layer, a mesh layer and a polytetrafluoroethylene layer from top to bottom. Therefore, the diaphragm 33 is flexible to improve the sealing effect of the composite diaphragm, and the tension of the diaphragm 33 is enhanced by the mesh layer, and the polytetrafluoroethylene layer is used to improve the corrosion resistance of the diaphragm 33 to the medium.

[0029] Furthermore, since an annular cavity 37 connected to the outflow port 38 is provided between the first pressure-bearing surface 310 and the second pressure-bearing surface 311, the annular cavity 37 can be used to increase the space for the medium to flow so as to reduce the resistance to the flow of the medium. At the same time, the annular cavity 37 can accumulate a certain amount of medium, thereby stabilizing the output of the medium.

[0030] On the basis of the above scheme, since the end of the driving rod 4 facing the valve body 3 is arranged to be conical, the cone head is used to apply force to ensure that the pressure column 32 is evenly stressed when pressed downward. Compared with the cylindrical surface, the problem of a gap between the diaphragm and the first pressure-bearing surface 310 caused by uneven force on the pressure surface can be avoided.

[0031] Furthermore, since a limit portion 39 is provided inside the upper valve body 31 and the limit portion 39 limits the upward movement distance of the pressure column 32, when the diaphragm 33 arches upward, the pressure column 32 is prompted to move upward. Since the setting of the limit portion 39 limits the upward movement distance of the pressure column 32, when the medium pushes up the diaphragm 33, the lower end surface of the pressure column 32 is blocked and fits with the diaphragm 33, thereby avoiding the problem of the diaphragm 33 being squeezed or over-stretched due to excessive medium pressure, thereby shortening the life of the diaphragm 33.

[0032] Furthermore, since the upper valve body 31 is also provided with an overflow hole 36, when the pressure column 32 moves upward, the gas can be discharged through the overflow hole 36 to reduce the resistance of the pressure column 32 when it moves upward; when the pressure column 32 moves downward, the internal and external pressures of the upper valve body 31 are balanced, which can reduce the resistance of the pressure column 32 when it moves downward. At the same time, when the diaphragm 33 is damaged, the medium can also be discharged to the outside through the overflow hole 36, so the problem of the medium flowing into the inside of the driving member 1 and causing damage to the driving member 1 can be avoided.

[0033] In addition, when the driving member 1 is a cylinder, a muffler 2 is also provided on the driving member 1, which can reduce the noise when the air flow is discharged and balance the air pressure inside the cylinder; further, since the driving rod 4 is movably installed on the driving member 1, the driving rod 4 can be easily installed and replaced when the conical part of the driving rod 4 is damaged; wherein, the driving rod 4 is connected to the cylinder rod by means of threaded fitting.

[0034] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A diaphragm valve, characterized in that: It comprises a valve body (3), a driving member (1) arranged on the valve body (3), and a driving rod (4) arranged on the driving member (1); The valve body (3) comprises a lower valve seat (30) and an upper valve seat (31), and a pressure column (32) and a diaphragm (33) are provided between the upper valve seat (31) and the lower valve seat (30); The diaphragm (33) is squeezed or separated from the diaphragm (33) by the pressure column (32), so that the medium flows in through the inlet (34) provided on the lower valve seat (30) and flows out through the outlet (38) provided on the lower valve seat (30); When the driving rod (4) applies pressure to the pressure column (32), the diaphragm (33) is prompted to block the communication between the inlet (34) and the outlet (38); The driving rod (4) is separated from the pressure column (32), so that the pressure of the medium is used to cause the diaphragm (33) to lift the pressure column (32) and move it upward, thereby completing the communication between the inlet (34) and the outlet (38).

2. A diaphragm valve according to claim 1, characterized in that: A first pressure-bearing surface (310) and a second pressure-bearing surface (311) are provided in the middle of the lower valve seat (30); the upper valve seat (31) presses the outer edge of the diaphragm (33) against the second pressure-bearing surface (311) via a protrusion (35) provided thereon, and the pressure column (32) causes the middle of the diaphragm (33) to contact the first pressure-bearing surface (310).

3. A diaphragm valve according to claim 2, characterized in that: An annular cavity (37) connected to and communicating with the outflow port (38) is also provided between the first pressure-bearing surface (310) and the second pressure-bearing surface (311).

4. A diaphragm valve according to claim 1, 2 or 3, characterized in that: One end of the driving rod (4) facing the valve body (3) is configured to be conical.

5. A diaphragm valve according to claim 4, characterized in that: A limiting portion (39) is also provided inside the upper valve seat (31), and the limiting portion (39) limits the distance that the pressure column (32) moves upward.

6. A diaphragm valve according to claim 5, characterized in that: The upper valve seat (31) is also provided with an overflow hole (36).

7. A diaphragm valve according to claim 6, characterized in that: The driving member (1) is also provided with a muffler, and the driving rod (4) is movably mounted on the driving member (1).

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