Manual diaphragm valve

Abstract

The utility model discloses a manual diaphragm valve which comprises a valve body, internal threads are arranged on the inner wall of the valve body, a valve rod is rotatably installed in the valve body, a rotary knob is installed on one side of the valve rod in a butt joint mode, external threads are arranged on the surface of the valve rod, the internal threads and the external threads are arranged in a mutual transmission mode, and an extrusion block is arranged at the bottom of the valve body. Diaphragms are arranged at the bottoms of the extrusion blocks. By means of the spiral valve rod and the valve body structure, opening and closing of the diaphragm valve can be achieved by rotating the valve rod, the diaphragm valve has a good disassembly and assembly structure, and the technical problem that in the prior art, a diaphragm valve is difficult to disassemble and assemble is solved. And through the arrangement of the integrated valve rod structure, the manufacturing cost of the device is greatly reduced, and the market advantage of the product is increased.

Description

Technical Field

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

[0002] A diaphragm valve is a special type of globe valve that controls the flow of fluid through a flexible diaphragm. This diaphragm is typically made of rubber, plastic, or other elastic materials and is attached to the valve's upper structure. When an operating mechanism (such as a handle or pneumatic / electric actuator) moves, it pushes or pulls on the diaphragm, opening or closing the flow path. The key feature of a diaphragm valve is that the diaphragm completely isolates the fluid from the actuator, making it ideal for applications requiring high purity and handling corrosive or toxic substances.

[0003] The Chinese invention patent with application number CN205745438U discloses a sampling diaphragm valve, which includes a valve body, which is composed of a handle, a valve cover, a valve seat "O" ring, a valve stem, a diaphragm valve core and a diaphragm valve seat. The diaphragm valve core is installed in the inner cavity of the valve seat to form a diaphragm cavity. The valve seat "O" ring is arranged between the valve cover and the diaphragm valve core to compress and seal. The handle and the valve stem are fixedly connected with screws. A feed area is designed at the bottom of the valve body, and a discharge area and an online disinfection interface are designed on the valve body. The discharge area and the online disinfection interface are designed on both sides of the valve body. The discharge area is designed with a discharge port. The rotation of the handle drives the valve stem to move up and down, and at the same time, the valve stem drives the diaphragm valve core to open and close. The diaphragm and the valve core are designed as one piece. The diaphragm valve core can meet the process requirements of frequent switching of oil and online high-temperature disinfection in the current production process of pharmaceuticals and biological products.

[0004] The IGS manual diaphragm valve in the prior art has the disadvantages of complex structure, difficult assembly and difficult maintenance. Once disassembled for repair, it is difficult to restore to the original state. Forced disassembly will cause the diaphragm valve to be scrapped or fail. In order to avoid the above risks, an IGS manual diaphragm valve structure with simple structure, easy assembly and easy maintenance is designed. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and provides a manual diaphragm valve.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A manual diaphragm valve includes a valve body, an inner wall of the valve body is provided with an internal thread, a valve stem is rotatably installed inside the valve body, a knob is butt-mounted on one side of the valve stem, the surface of the valve stem is provided with an external thread, the internal thread and the external thread are arranged to transmit to each other, an extrusion block is provided at the bottom of the valve body, and a diaphragm is provided at the bottom of the extrusion block.

[0008] According to a further technical solution, nitrile rubber is provided on the upper side of the valve stem inside the valve body.

[0009] According to a further technical solution, a switch mark is provided on the valve body at a position corresponding to the knob.

[0010] Compared with the prior art, the present invention provides a manual diaphragm valve with the following beneficial effects:

[0011] By setting up the spiral valve stem and valve body structure, the diaphragm valve can be opened and closed by rotating the valve stem. The diaphragm valve has a good disassembly and assembly structure, avoiding the technical problem of difficult disassembly and assembly of the diaphragm valve in the prior art.

[0012] The integrated valve stem structure greatly reduces the manufacturing cost of the device and increases the market advantage of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural diagram of a manual diaphragm valve proposed by the utility model;

[0014] Figure 2 This is a schematic cross-sectional structural diagram of a manual diaphragm valve proposed by the utility model.

[0015] In the figure: 1. Valve body; 2. Internal thread; 3. Valve stem; 4. External thread; 5. Extrusion block; 6. Diaphragm; 7. Knob; 8. Nitrile rubber; 9. Switch mark. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] Example 1: Reference Figure 1 - Figure 2 A manual diaphragm valve includes a valve body 1, which is the main shell of the diaphragm valve. The inner wall of the valve body 1 is provided with an internal thread 2, and the internal thread 2 and the external thread 4 are docked with each other to achieve the threaded installation effect of the valve stem 3. The valve stem 3 is rotatably installed inside the valve body 1, and a knob 7 is docked and installed on one side of the valve stem 3. The knob 7 is used to control the rotation effect of the valve stem 3. The surface of the valve stem 3 is provided with an external thread 4, and the internal thread 2 and the external thread 4 are arranged to transmit to each other to achieve the up and down movement of the valve stem 3. An extrusion block 5 is provided at the bottom of the valve body 1. Under the action of the valve stem 3, the extrusion block 5 contacts the surface of the diaphragm 6, thereby achieving the closing effect of the diaphragm 6. A diaphragm 6 is provided at the bottom of the extrusion block 5.

[0018] A manual diaphragm valve is provided with nitrile rubber 8 on the upper side of the valve stem 3 inside the valve body 1, for increasing the sealing performance of the gap between the valve stem 3 and the valve body 1.

[0019] A manual diaphragm valve is provided with a switch mark 9 at a position corresponding to the knob 7 on the valve body 1, which is used to indicate the rotation angle of the knob 7 corresponding to the rotation angle of the valve stem 3.

[0020] Working principle:

[0021] During the actual design process of the utility model, in order to avoid the following defects existing in the prior art: "The IGS manual diaphragm valve in the prior art has the disadvantages of complex structure, difficult assembly, and difficult maintenance. Once it is disassembled for repair, it is difficult to restore it to its original state. Forced disassembly will cause the diaphragm valve to be scrapped or fail. In order to avoid the above risks, an IGS manual diaphragm valve structure with a simple structure, easy assembly and easy maintenance is designed." A manual spiral valve stem structure is proposed in a targeted manner.

[0022] To open or close the diaphragm valve, manually rotate the knob 7 according to the position of the switch mark 9 to achieve the "open" and "close" effects respectively. When the knob 7 is rotated to the valve opening position, the valve stem 3 moves upward inside the valve body 1 due to the relative rotation between the internal thread 2 and the external thread 4, thereby causing the extrusion block 5 to spring up at the bottom of the valve body 1 and cause the diaphragm 6 to tilt. The process of the diaphragm 6 tilting up will open the valve.

[0023] Similarly, to close the diaphragm valve, we rotate the knob 7 in the opposite direction, and the valve stem 3 moves downward by a spiral action, and then abuts against the surface of the extrusion block 5. The extrusion block 5 squeezes the diaphragm 6, so that the bottom of the valve body 1 is closed, achieving the effect of closing the valve.

[0024] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or device. The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the present invention, who makes equivalent substitutions or changes based on the technical solution and utility model concept of the present invention, should be included in the scope of protection of the present invention.

Claims

1. A manual diaphragm valve, comprising a valve body (1), characterized in that: The inner wall of the valve body (1) is provided with an internal thread (2), a valve stem (3) is rotatably installed inside the valve body (1), a knob (7) is docked and installed on one side of the valve stem (3), an external thread (4) is provided on the surface of the valve stem (3), the internal thread (2) and the external thread (4) are arranged to transmit each other, an extrusion block (5) is provided at the bottom of the valve body (1), and a diaphragm (6) is provided at the bottom of the extrusion block (5).

2. A manual diaphragm valve according to claim 1, characterized in that: The upper side of the valve stem (3) inside the valve body (1) is provided with nitrile rubber (8).

3. A manual diaphragm valve according to claim 1, characterized in that: A switch mark (9) is provided on the valve body (1) at a position corresponding to the knob (7).

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