Straight-through type diaphragm valve

Abstract

The utility model provides a straight-through type diaphragm valve which comprises a valve cover and a valve body, a fluid channel is arranged in the valve body, a valve port is arranged on the valve body, a diaphragm is covered on the valve port, a valve rod is arranged on the valve cover in a matched mode, and the valve rod can ascend and descend relative to the valve body to enable an abutting portion of the valve rod to abut against the diaphragm so as to conduct or block the fluid channel. The fluid channel is transversely arranged in a cylindrical shape, the valve port is longitudinally matched with the valve rod, a valve seat is arranged at the valve port in a matched mode, an operation port corresponding to the valve port is formed in the valve seat, and the width a of the operation port is larger than the width b of the valve port so that the abutting portion can abut against the diaphragm conveniently to form sealing. The diaphragm is detachably connected between the valve cover and the valve seat so as to shield the operation opening; according to the straight-through type diaphragm valve, a traditional valve weir structure is omitted, the flowing resistance of fluid in a pipeline is small, flowing is smooth, material deposition caused by dead angles is avoided, and a corrosion-resistant lining is conveniently arranged.

Description

Technical Field

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

[0002] The diaphragm valve is a stop valve that uses a diaphragm as a start and stop part to close the flow channel, cut off the fluid, and separate the inner cavity of the valve body from the inner cavity of the valve cover. The diaphragm is usually made of elastic, corrosion-resistant, and non-permeable materials such as rubber and plastic. The valve body is mostly made of plastic, fiberglass, ceramic or metal-lined rubber materials. The diaphragm valve has a simple structure, good sealing and corrosion resistance, and low fluid resistance. It is often used in low-pressure, low-temperature, highly corrosive media and media containing suspended matter. According to the drive mode, it can be divided into manual, pneumatic, and electric.

[0003] Reference Fig.10 The existing diaphragm valve generally has a valve weir (i.e., valve seat) protruding relative to the pipeline, and a diaphragm sheet matched with the valve weir. The two sides of the valve weir face the two ends of the pipeline and divide the pipeline into two sections. The staff controls whether the diaphragm sheet above the valve weir contacts and cooperates with the valve weir through the valve stem to achieve blocking and conduction of the pipeline. However, the valve weir of this diaphragm valve protruding from the inner wall of the pipeline increases the fluid resistance in the pipe and is prone to form dead angles. When a corrosion-resistant lining is provided on the inner wall of the pipeline, the valve weir part needs to be precisely designed to fit the surface of the valve weir, otherwise it will easily affect the sealing of the diaphragm valve.

[0004] In view of the above technical problems, the inventors have designed a straight-through diaphragm valve, eliminating the traditional valve weir structure, so that the fluid has low flow resistance in the pipeline and flows smoothly, and avoids dead corners that lead to material deposition, making it convenient to set up a corrosion-resistant lining. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a straight-through diaphragm valve. The technical solution adopted by the utility model is as follows:

[0006] A straight-through diaphragm valve comprises a valve cover and a valve body, wherein the valve body has a fluid channel and a valve port is arranged on the valve body, the valve port is covered by a diaphragm, the valve cover is provided with a valve stem, the valve stem can be raised and lowered relative to the valve body so that the abutting portion of the valve stem abuts against the diaphragm to thereby open or block the fluid channel, the fluid channel is cylindrical and arranged transversely, the valve port is longitudinally matched with the valve stem, and a valve seat is provided at the valve port, an operating port is formed on the valve seat corresponding to the valve port, the width a of the operating port is greater than the width b of the valve port, the diaphragm is detachably connected between the valve cover and the valve seat to cover the operating port; the width a of the operating port is greater than the width b of the valve port, so that the abutting portion of the valve stem is adapted to the operating port and the valve port, and the abutting diaphragm forms a stepped seal or a sealing slope, thereby enhancing the stability of the valve stem abutment and the sealing performance of blocking the fluid.

[0007] Preferably, the maximum width b of the valve openingmax Equal to the diameter of the fluid channel.

[0008] Preferably, the abutment portion of the valve stem is conical, and the tip of the abutment portion is an arc surface that matches the inner wall of the fluid channel. The tip of the abutment portion pushes the diaphragm to match the inner wall of the bottom surface of the fluid channel to block the fluid channel.

[0009] Preferably, the valve seat comprises an expansion portion extending from the valve port and expanding outwardly relative to the valve port, and the upper end of the expansion portion encloses and forms an operating port.

[0010] Preferably, the valve port is opened on the outer surface of the valve body pipeline, and a fluid channel is formed in the pipeline; the edge of the valve port is in an arc shape, and the arc extends obliquely downward from the two lateral ends of the valve port located on the top surface of the pipeline and intersects at the lowest longitudinal point of the valve port so that the two-dimensional projection of the valve port edge is a closed figure.

[0011] Preferably, the top of the expansion portion is at the same height as the top surface of the valve body pipe with the fluid channel, that is, the expansion portion is not higher than the valve body pipe with the fluid channel in the longitudinal direction, and its upper end surface is flush with the top surface of the valve body pipe.

[0012] Preferably, a flange portion is provided at the top of the expansion portion, the diaphragm covers the valve seat to cover the valve port, and the edge of the diaphragm is connected to the flange portion via a detachable positioning structure, for example, screw holes are provided on the flange portion for detachable connection via bolts.

[0013] Preferably, the flange portion forms an opening at a position corresponding to the operating port, and the inner wall of the opening is an outwardly inclined surface; the "outwardly inclined" refers to inclining from bottom to top in a direction away from the center of the opening, and when the conical resistance portion resists the diaphragm and thus blocks the fluid channel, it contacts the outwardly inclined surface of the inner wall of the opening, the expansion portion, and the edge of the valve port.

[0014] Preferably, a corrosion-resistant lining layer is provided in the fluid channel of the valve body, and the diaphragm has a corrosion-resistant layer.

[0015] Preferably, both ends of the fluid channel of the valve body are provided with detachable connecting parts, such as connecting flanges or threaded interfaces.

[0016] The beneficial effects of the utility model are as follows:

[0017] 1. The cylindrical fluid channel is adopted, and the valve weir is eliminated, so that the flow channel is unobstructed, the fluid resistance is small, and there is no dead angle in the flow channel;

[0018] 2. It has good sealing performance and is easy to replace the diaphragm. The diaphragm of the diaphragm valve can be replaced on site in a very short time, which is convenient for maintenance;

[0019] 4. Various structural forms, manual and pneumatic operation of the valve stem, suitable for sterile and pollution-free production;

[0020] 5. Self-cleaning effect: The inside of the diaphragm valve is straight, without shrinkage, accumulation, or dead angle. It is not easy for materials to get blocked or agglomerated, which reduces pressure and friction loss and is easy to flush.

[0021] 6. Corrosion resistance: The valve body of the diaphragm valve uses corrosion-resistant lining and corrosion-resistant diaphragm instead of the valve core assembly, and uses the movement of the diaphragm to adjust the valve body, which is suitable for the adjustment of strong corrosive media such as strong acids and alkalis;

[0022] 7. Flow characteristics: The flow characteristics of the diaphragm valve are close to fast opening, and are approximately linear before 60% of the stroke. The flow rate does not change much after 60%, meeting the needs of automatic control, program control or flow regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, 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 utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0024] Figure 1 This is the overall structural appearance diagram of Example 1;

[0025] Figure 2 This is an exploded view of the overall structure of Example 1;

[0026] Figure 3 This is a top view of the valve seat of Example 1;

[0027] Figure 4 for Figure 3 Sectional view at AA;

[0028] Figure 5 for Figure 3 Sectional view at the middle BB;

[0029] Figure 6 It is a schematic diagram of the cooperation between the valve seat and the fluid channel;

[0030] Figure 7 A schematic diagram showing the cooperation between the valve seat and the fluid channel from another angle;

[0031] Figure 8 Schematic diagram of the coordination between the valve cover, valve stem, valve seat and fluid passage (the valve cover and valve stem structures are not distinguished);

[0032] Fig. 9It is a schematic diagram of the coordination of the valve cover, valve stem, valve seat and fluid channel from another angle (the valve cover and valve stem structure are not distinguished);

[0033] Fig.10 It is a structural schematic diagram of an existing diaphragm valve;

[0034] Figure 1-9 Among them, 1-valve cover, 2-valve body, 21-valve port, 22-valve seat, 221-operating port, 222-expansion part, 223-flange part, 23-connecting part, 201-fluid channel, 3-diaphragm, 4-contact part;

[0035] Fig.10 Among them, 001-existing bonnet, 002-existing valve stem, 003-existing valve disc, 004-existing lining layer, 005-existing diaphragm, 006-existing valve body. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0037] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0038] Example 1

[0039] like Figure 1-7 As shown, a straight-through diaphragm valve comprises a valve cover 1 and a valve body 2. The valve body 2 has a fluid channel 201 therein and a valve port 21 is arranged on the valve body 2. The valve port 21 is covered with a diaphragm 3. The valve cover 1 is provided with a valve stem. The valve stem can be raised and lowered relative to the valve body 2 so that the abutting portion 4 of the valve stem abuts against the diaphragm 3 to thereby open or block the fluid channel 201. The fluid channel 201 is cylindrical and arranged transversely. The valve port 21 is longitudinally matched with the valve stem, and a valve seat 22 is provided at the valve port 21. An operating port 221 is formed on the valve seat 22 corresponding to the valve port 21. The width a of the operating port 221 is greater than the width b of the valve port 21. The diaphragm 3 is detachably connected between the valve cover 1 and the valve seat 22 to cover the operating port 221.

[0040] In this embodiment, the width of the valve port 21 is equal to the diameter of the fluid channel 201. Figure 4 , then b=b max, the valve port 21 is at least partially located on the center line of the fluid channel 201; the valve seat 22 includes an expansion portion 222 extending from the valve port 21 and expanding outward relative to the valve port 21, and the upper end of the expansion portion 222 encloses an operating port 221, and the resistance portion 4 of the valve stem is conical, and the tip of the resistance portion 4 is an arc surface that cooperates with the inner wall of the fluid channel 201, and the tip of the resistance portion 4 pushes the diaphragm to cooperate with the inner wall of the bottom surface of the fluid channel to block the fluid channel.

[0041] Specifically, refer to Figure 3-7 , the width b of the valve port 21 is equal to the diameter of the fluid channel 201, and the length of the valve port 21 is greater than the diameter of the fluid channel, so the plane projection of the valve port 21 is an ellipse; after the expansion portion is expanded, it is enclosed with the pipeline surface to form an operating port 221, and the width of the operating port 221 is equal to the length of the valve port 21 to form a circular operating port, and the contact portion 4 of the valve stem is roughly conical but not a standard cone, but a cone with an arc transition surface that matches the shape of the operating port, the expansion portion, the valve port 21, and the inner wall of the fluid channel; refer to Figure 8-9 The abutting portion 4 of the valve stem abuts against the diaphragm and seals against the inner wall of the fluid channel.

[0042] Reference Figure 5 The valve port 21 is opened on the outer surface of the valve body pipeline, and a fluid channel 201 is formed in the pipeline; the edge of the valve port 21 is in an arc shape, and the left and right ends of the valve port are located on the top surface of the pipeline. The left and right ends of the valve port extend obliquely downward in an arc and meet at the lowest point in the longitudinal direction of the valve port 21 (located on the same horizontal plane as the center line of the pipeline), so that the two-dimensional projection of the edge of the valve port 21 is a closed figure.

[0043] The top of the expansion portion 222 is at the same height as the top surface of the valve body pipe that opens the fluid channel 201; Figure 6-7 , that is, the expansion portion is not higher than the valve body pipeline with the fluid channel in the longitudinal direction, and its upper end surface is flush with the top surface of the valve body pipeline.

[0044] Furthermore, a flange portion 223 is provided at the top of the expansion portion 222, the diaphragm 3 covers the valve seat 22 to cover the valve port 21, and the edge of the diaphragm 3 is connected to the flange portion 223 via a detachable positioning structure. In this embodiment, a screw hole is provided on the flange portion, a positioning hole is opened at the edge of the diaphragm, and the positioning hole and the screw hole are detachably connected via bolts.

[0045] Reference Figure 4 , Figure 7 The flange portion 223 forms an opening at a position corresponding to the operating port 221, and the inner wall of the opening is an outwardly inclined slope. When the conical contact portion 4 contacts the diaphragm 3 and thus blocks the fluid channel 201, it contacts the outwardly inclined slope of the inner wall of the opening, the expansion portion, and the edge of the valve port 21.

[0046] Finally, a corrosion-resistant lining layer is provided in the fluid channel 201 of the valve body 2, the diaphragm 3 has a corrosion-resistant layer, and both ends of the fluid channel 201 of the valve body 2 are detachably provided with connecting parts 23, such as connecting flanges or threaded interfaces.

[0047] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A straight-through diaphragm valve, comprising a valve cover (1) and a valve body (2), wherein the valve body (2) has a fluid passage (201) therein and a valve port (21) is arranged on the valve body (2), and a diaphragm (3) covers the valve port (21), the valve cover (1) is provided with a valve stem, and the valve stem can be raised and lowered relative to the valve body (2) so that a contact portion (4) of the valve stem contacts the diaphragm (3) to thereby open or block the fluid passage (201), characterized in that: The fluid channel (201) is arranged transversely in a cylindrical shape, the valve port (21) is longitudinally matched with the valve stem, and a valve seat (22) is arranged at the valve port (21), an operating port (221) is formed on the valve seat (22) corresponding to the valve port (21), a width a of the operating port (221) is greater than a width b of the valve port (21), and the diaphragm (3) is detachably connected between the valve cover (1) and the valve seat (22) to cover the operating port (221).

2. A straight-through diaphragm valve according to claim 1, characterized in that: The maximum width b of the valve opening (21) max Equal to the diameter of the fluid channel (201).

3. A straight-through diaphragm valve according to claim 1, characterized in that: The abutment portion (4) of the valve stem is conical, and the tip of the abutment portion (4) is an arc surface that matches the inner wall of the fluid channel (201).

4. A straight-through diaphragm valve according to claim 3, characterized in that: The valve seat (22) comprises an expansion portion (222) extending from the valve port (21) and expanding outwardly relative to the valve port (21), and the upper end of the expansion portion (222) encloses the operating port (221).

5. A straight-through diaphragm valve according to claim 3, characterized in that: The valve port (21) is opened on the outer surface of the valve body pipeline, and a fluid channel (201) is formed in the pipeline; the edge of the valve port (21) is in the shape of an arc, and the arc extends obliquely downward from the two lateral ends of the valve port located on the top surface of the pipeline and intersects at the lowest point in the longitudinal direction of the valve port (21), so that the two-dimensional projection of the edge of the valve port (21) is a closed figure.

6. A straight-through diaphragm valve according to claim 4, characterized in that: The top end of the expansion portion (222) is at the same height as the top surface of the valve body pipe in which the fluid channel (201) is opened.

7. A straight-through diaphragm valve according to claim 4, characterized in that: A flange portion (223) is provided at the top end of the expansion portion (222), the diaphragm (3) covers the valve seat (22) to cover the valve port (21), and the edge of the diaphragm (3) is connected to the flange portion (223) via a detachable positioning structure.

8. A straight-through diaphragm valve according to claim 7, characterized in that: The flange portion (223) forms an opening at a position corresponding to the operation port (221), and the inner wall of the opening is an inclined surface inclined outwards.

9. The straight-through diaphragm valve according to claim 1, characterized in that: A corrosion-resistant lining layer is arranged in the fluid channel (201) of the valve body (2), and the diaphragm (3) has a corrosion-resistant layer.

10. The straight-through diaphragm valve according to claim 1, characterized in that: Connecting parts (23) are detachably provided at both ends of the fluid channel (201) of the valve body (2).

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