A diaphragm valve manual adjusting mechanism and an electric diaphragm valve

Abstract

The application discloses a diaphragm valve manual adjusting mechanism and an electric diaphragm valve. A first cylinder body cooperation part and a first adjusting cooperation part are arranged on a hand wheel of the former. A second cylinder body cooperation part is arranged on a cylinder body, and the second cylinder body cooperation part is detachably connected with the first cylinder body cooperation part. An adjusting part is rotationally connected with the cylinder body, and a second adjusting cooperation part of the adjusting part is in transmission cooperation with the first adjusting cooperation part, a third adjusting cooperation part is in clearance cooperation with the first adjusting cooperation part, and a valve rod cooperation part is used for being connected with a valve rod. In a static state, the first cylinder body cooperation part and the second cylinder body cooperation part are cooperated, and the first adjusting cooperation part and the third adjusting cooperation part are cooperated. In an adjusting state, the first cylinder body cooperation part and the second cylinder body cooperation part are separated, and the first adjusting cooperation part and the second adjusting cooperation part are cooperated. The hand wheel of the diaphragm valve manual adjusting mechanism can directly drive the valve rod to move through the adjusting part, and the structure is simple, the cost is low, and the volume is small.

Description

Technical Field

[0001] This invention relates to the field of diaphragm valve regulation, and more specifically, to a manual adjustment mechanism for a diaphragm valve and an electric diaphragm valve. Background Technology

[0002] The diaphragm valve's opening and closing element is a diaphragm. The diaphragm separates the lower valve body cavity from the upper cylinder or valve cover cavity, ensuring that the valve stem, valve disc, and other parts located above the diaphragm are not corroded by the medium and have the advantage of preventing media leakage.

[0003] Non-manual diaphragm valves may encounter unexpected situations requiring emergency manual operation during use. For example, in the event of a power outage, an electric diaphragm valve needs to be manually operated to shut it off immediately. However, existing manual adjustment mechanisms for diaphragm valves are complex, leading to increased cost and larger size.

[0004] Therefore, how to provide a low-cost and compact manual adjustment mechanism for diaphragm valves has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] One objective of this invention is to provide a new technical solution for a diaphragm valve manual adjustment mechanism that is low in cost and small in size.

[0006] According to a first aspect of the present invention, a manual adjustment mechanism for a diaphragm valve is provided.

[0007] The manual adjustment mechanism of the diaphragm valve includes a handwheel, a cylinder, and an adjusting element; wherein...

[0008] The handwheel is provided with a first cylinder body mating part and a first adjustment mating part;

[0009] The cylinder body is provided with a second cylinder body mating part, which is detachably connected to the first cylinder body mating part;

[0010] The adjusting member is rotatably connected to the cylinder body, and the adjusting member is provided with a second adjusting engagement part, a third adjusting engagement part and a valve stem engagement part. The second adjusting engagement part is in transmission engagement with the first adjusting engagement part, the third adjusting engagement part is in clearance engagement with the first adjusting engagement part, and the valve stem engagement part is used to connect with the valve stem.

[0011] The handwheel has a stationary state and an adjustment state;

[0012] In the stationary state, the first cylinder body mating part and the second cylinder body mating part are mated, and the first adjusting mating part and the third adjusting mating part are mated;

[0013] In the adjusted state, the first cylinder body mating part and the second cylinder body mating part are separated, and the first adjustment mating part and the second adjustment mating part are mated.

[0014] Optionally, the handwheel includes a handwheel body and a mating cavity, the first cylinder mating part is disposed on the handwheel body, and the first adjusting mating part is disposed on the inner wall of the mating cavity.

[0015] Optionally, the first cylinder body mating part is an annular groove provided on the handwheel body, and the second cylinder body mating part is an annular protrusion.

[0016] Optionally, both the first and second adjusting parts have toothed structures, and the third adjusting part is located on the side of the second adjusting part away from the handwheel.

[0017] Optionally, the cylinder body is provided with an adjusting member retaining ring, and the adjusting member is provided with an adjusting member retaining ring groove, and the adjusting member retaining ring cooperates with the adjusting member retaining ring groove.

[0018] Optionally, the handwheel is further provided with a fourth adjusting engagement part, and the cylinder body is further provided with a fifth adjusting engagement part and a sixth adjusting engagement part. The fourth adjusting engagement part and the fifth adjusting engagement part are engaged in a snap-fit ​​engagement, and the sixth adjusting engagement part and the fourth adjusting engagement part are engaged in a clearance engagement.

[0019] In the static state, the fourth adjustment and the fifth adjustment and the fifth adjustment are engaged.

[0020] In the adjusted state, the fourth adjustment mating part and the sixth adjustment mating part cooperate.

[0021] Optionally, the manual adjustment mechanism of the diaphragm valve further includes a limiting member, which is connected to the handwheel;

[0022] The adjusting member has a limiting member cavity, the limiting member is slidably connected to the limiting member cavity, and the limiting member cavity has a limiting fitting part, the limiting member has a limiting part, the limiting fitting part and the limiting part cooperate to control the movement stroke of the limiting member in the limiting member cavity.

[0023] Optionally, the cylinder, the handwheel, the adjusting member, and the limiting member are arranged sequentially from the outside to the inside.

[0024] According to a second aspect of the present invention, an electric diaphragm valve is provided.

[0025] The electric diaphragm valve includes a valve stem and a manual adjustment mechanism for the diaphragm valve as described in this invention, wherein the valve stem and the valve stem mating part are in a driving engagement.

[0026] Optionally, the electric diaphragm valve further includes a display rod, one end of which is fixedly connected to the valve stem, and the other end of which passes through the adjusting member and through the handwheel.

[0027] In the manual adjustment mechanism of the diaphragm valve of the present invention, when the handwheel is stationary, the handwheel and the cylinder remain relatively stationary, and the adjusting component can rotate within the cylinder along with the valve stem; when the handwheel is in the adjustment state, the handwheel can drive the adjusting component to rotate within the cylinder, and the adjusting component drives the valve stem to rotate, thereby achieving the purpose of adjusting the position of the valve stem within the cylinder by means of the handwheel.

[0028] The handwheel of the manual adjustment mechanism for the diaphragm valve of the present invention can directly drive the valve stem to move through the adjustment component. It has a simple structure, low cost and small size.

[0029] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0031] Figure 1 This is a schematic diagram of an embodiment of the manual adjustment mechanism for the diaphragm valve of the present invention.

[0032] Figure 2 for Figure 1 Cross-sectional view.

[0033] Figure 3 This is a schematic diagram of the structure of the manual adjustment mechanism of the diaphragm valve of the present invention in a static state.

[0034] Figure 4 This is a schematic diagram of the structure of the manual adjustment mechanism of the diaphragm valve of the present invention in the adjustment state.

[0035] The diagram is marked as follows:

[0036] Handwheel-1, handwheel body-11, first cylinder body mating part-111, fourth adjustment mating part-112, first adjustment mating part-12, cylinder body-2, second cylinder body mating part-21, fifth adjustment mating part-22, sixth adjustment mating part-23, adjusting member-3, second adjustment mating part-31, third adjustment mating part-32, limiting member cavity-33, valve stem cavity-34, valve stem mating part-340, limiting member-4, limiting part-40, valve stem-5, display rod-6. Detailed Implementation

[0037] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0038] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0039] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0040] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0041] like Figures 1 to 4 As shown, the manual adjustment mechanism of the diaphragm valve of the present invention includes a handwheel 1, a cylinder 2, and an adjustment component 3.

[0042] The handwheel 1 is provided with a first cylinder body mating part 111 and a first adjusting mating part 120. The first cylinder body mating part 111 can be used to position the handwheel 1 on the cylinder body 2 when the diaphragm valve does not need to be manually adjusted. The first adjusting mating part 120 can drive the adjusting member 3 to move via the handwheel 1 when the diaphragm valve needs to be manually adjusted.

[0043] The cylinder block 2 is provided with a second cylinder block mating part 21. The second cylinder block mating part 21 is detachably connected to the first cylinder block mating part 111. The detachable connection between the second cylinder block mating part 21 and the first cylinder block mating part 111 can be achieved by snap-fit ​​connection or interference fit. By applying a force to the handwheel 1 in a direction away from or towards the cylinder block 2, the first cylinder block mating part 111 and the second cylinder block mating part 21 can be switched between connected and disconnected states.

[0044] Normally, when the second cylinder body mating part 21 is connected to the first cylinder body mating part 111, the handwheel 1 and the cylinder body 2 remain relatively stationary; when the second cylinder body mating part 21 is separated from the first cylinder body mating part 111, the handwheel 1 can move relative to the cylinder body 2 under the action of an external force.

[0045] The adjusting member 3 is rotatably connected to the cylinder body 2, and the adjusting member 3 is provided with a second adjusting mating part 31, a third adjusting mating part 32, and a valve stem mating part 340. The rotatable connection between the adjusting member 3 and the cylinder body 2 allows the adjusting member 3 to rotate relative to the cylinder body 2 under the drive of the valve stem 5 without moving up and down. The rotatable connection between the adjusting member 3 and the cylinder body 2 can be achieved through the fit between the protrusion and the groove, or through the rotatable fit between the retaining ring on the adjusting member 3 and the groove on the cylinder body.

[0046] The second adjusting part 31 is driven to engage with the first adjusting part 120, so that when the diaphragm valve needs to be manually adjusted, the handwheel 1 can drive the adjusting member 3 to rotate within the cylinder 2. The drive engagement between the second adjusting part 31 and the first adjusting part 120 can be achieved through the engagement between the strip teeth provided on the adjusting member 3 and the mating teeth provided on the handwheel 1.

[0047] The third adjusting part 32 is clearance-fitted with the first adjusting part 120, so that when the diaphragm valve does not need to be manually adjusted, the adjusting member 3 can be driven by the valve stem 5 to rotate relative to the handwheel 1 without being jammed by the handwheel 1 or causing the handwheel 1 to rotate. In specific implementation, the third adjusting part 32 can be, for example, an annular groove provided on the adjusting member 3, with a gap between the annular groove and the first adjusting part 120; or, the third adjusting part 32 can be a smooth surface on the adjusting member 3, with a gap between the smooth surface and the first adjusting part 120.

[0048] The valve stem mating part 340 is used to connect with the valve stem 5. The connection between the valve stem mating part 340 and the valve stem 5 allows the adjusting member 3 to drive the valve stem 5 to rotate within the cylinder body 2. When the diaphragm valve is an electric diaphragm valve, the valve stem 5 is driven by an electric drive mechanism to move up and down within the cylinder body 2 via a screw drive. In this case, the valve stem mating part 340 can be driven to the valve stem 5 (for example, via a rack and pinion drive), so that when the adjusting member 3 drives the valve stem 5 to rotate within the cylinder body 2, the valve stem 5 can move up and down within the cylinder body 2 under the threaded limit of the screw drive. When the diaphragm valve is a pneumatic diaphragm valve, the valve stem mating part 340 can be threaded to the valve stem 5, so that when the adjusting member 3 is rotated, the valve stem 5 can move up and down within the cylinder body 2 under the drive of the adjusting member 3.

[0049] In a specific implementation, the regulating member 3 may be provided with a valve stem cavity 34, and the valve stem mating part 340 may be located in the valve stem cavity 34.

[0050] Handwheel 1 has a stationary state and an adjustment state.

[0051] In the stationary state, the first cylinder body mating part 111 and the second cylinder body mating part 31 are engaged, and the first adjusting mating part 120 and the third adjusting mating part 32 are engaged. In the stationary state, the handwheel 1 and the cylinder body 2 remain relatively stationary, and the valve stem 5 can drive the adjusting member 3 to move up and down within the cylinder body 2.

[0052] In the adjustment state, the first cylinder body mating part 111 and the second cylinder body mating part 31 are separated, and the first adjustment mating part 120 and the second adjustment mating part 120 are engaged. In the adjustment state, the handwheel 1 is separated from the cylinder body 2, and the handwheel 1 can be rotated under the action of external force. The handwheel 1 drives the adjusting member 3 to rotate, and the adjusting member 3 drives the valve stem 5 to move up and down inside the cylinder body 2.

[0053] In use, the manual adjustment mechanism for the diaphragm valve of this invention first applies force to the handwheel 1, causing it to separate from the cylinder 2. At this point, the handwheel 1 can be rotated. Rotating the handwheel 1 causes the adjusting element 3 to rotate, which in turn causes the valve stem 5 to rotate synchronously, achieving manual adjustment of the valve stem 5's position within the cylinder 2, ultimately resulting in manual closure of the diaphragm valve. Next, force can be applied to the handwheel 1, causing it to re-engage with the cylinder 2. At this point, the handwheel 1 is positioned on the cylinder 2, and the rotation of the adjusting element 3 does not affect the stationary state of the handwheel 1. When the diaphragm valve returns to normal operation, the valve stem 5 can rotate within the cylinder 2, and the adjusting element 3 is rotated by the valve stem 5 without causing the handwheel 1 to move.

[0054] In the manual adjustment mechanism of the diaphragm valve of the present invention, when the handwheel 1 is stationary, the handwheel 1 and the cylinder 2 remain relatively stationary, and the adjusting member 3 can rotate with the valve stem 5 inside the cylinder 2; when the handwheel 1 is in the adjustment state, the handwheel 1 can drive the adjusting member 3 to rotate inside the cylinder 2, and the adjusting member 3 drives the valve stem 5 to rotate, so as to achieve the purpose of adjusting the position of the valve stem 5 inside the cylinder 2 by the handwheel 1.

[0055] The handwheel 1 of the manual adjustment mechanism of the diaphragm valve of the present invention can directly drive the valve stem 5 to move through the adjustment component 3. It has a simple structure, low cost and small size.

[0056] In one embodiment of the manual adjustment mechanism for the diaphragm valve of the present invention, the handwheel 1 includes a handwheel body 11 and a mating cavity. A first cylinder mating part 111 is disposed on the handwheel body 11. A first adjustment mating part 120 is disposed on the inner wall of the mating cavity. This structure of the handwheel 1 makes the structure of the manual adjustment mechanism for the diaphragm valve more compact, thereby reducing the volume of the manual adjustment mechanism for the diaphragm valve.

[0057] Furthermore, to more effectively reduce the volume of the diaphragm valve manual adjustment mechanism, the first cylinder body mating part 111 is an annular groove provided on the handwheel body 11, and the second cylinder body mating part 21 is an annular protrusion. In specific implementation, the handwheel body 11 can be made of a plastic (such as rubber) with a certain degree of elasticity, so that the first cylinder body mating part 111 and the second cylinder body mating part 21 can undergo elastic deformation when they are mated together, thereby more reliably positioning the handwheel 1 on the cylinder body 2.

[0058] In one embodiment of the manual adjustment mechanism for the diaphragm valve of the present invention, both the first adjustment mating part 120 and the second adjustment mating part 31 have toothed structures, and the third adjustment mating part 32 is located on the side of the second adjustment mating part 31 away from the handwheel 1. The toothed structures of the first adjustment mating part 120 and the second adjustment mating part 31 can efficiently and stably transmit the force received by the handwheel 1 to the adjustment member 3, improving the user experience of the manual adjustment mechanism for the diaphragm valve and making it easy to implement.

[0059] In one embodiment of the manual adjustment mechanism for the diaphragm valve of the present invention, an adjusting member retaining ring is provided on the cylinder body 2. An adjusting member retaining ring groove is provided on the adjusting member 3, and the adjusting member retaining ring mates with the adjusting member retaining ring groove. By providing the adjusting member retaining ring and the adjusting member retaining ring groove, the adjusting member 3 can be installed more stably and reliably within the cylinder body 2. In specific implementations, the adjusting member retaining ring and the adjusting member retaining ring groove are arranged in pairs, and the manual adjustment mechanism for the diaphragm valve has multiple pairs of adjusting member retaining rings and adjusting member retaining ring grooves.

[0060] In one embodiment of the manual adjustment mechanism of the diaphragm valve of the present invention, the handwheel 1 is further provided with a fourth adjustment mating part 112, and the cylinder body 2 is further provided with a fifth adjustment mating part 22 and a sixth adjustment mating part 23.

[0061] The fourth adjusting part 112 and the fifth adjusting part 22 are engaged. This engagement can be achieved through a snap-fit ​​connection or a toothed locking mechanism. The engagement between the fourth adjusting part 112 and the fifth adjusting part 22 ensures a more stable and reliable hold of the handwheel 1 on the cylinder body 2 when manual adjustment of the diaphragm valve is not required.

[0062] The sixth adjusting part 23 and the fourth adjusting part 112 are fitted with a clearance, so that when the diaphragm valve needs to be manually adjusted, a certain clearance can be maintained between the handwheel 1 and the cylinder 2, thereby allowing for smoother application of force to the handwheel 1. In specific implementation, the sixth adjusting part 23 can be, for example, an annular groove provided on the cylinder 2, with a clearance between the annular groove and the fourth adjusting part 112; or, the sixth adjusting part 23 can be a smooth surface inside the cylinder 2, with a clearance between the smooth surface and the fourth adjusting part 112.

[0063] In the stationary state, the fourth adjusting part 112 and the fifth adjusting part 22 are engaged. In the stationary state, the handwheel 1 is stably engaged with the cylinder body 2, and the valve stem 5 can drive the adjusting member 3 to move up and down within the cylinder body 2.

[0064] In the adjustment state, the fourth adjustment mating part 112 and the sixth adjustment mating part 23 are engaged. In the adjustment state, the handwheel 1 is separated from the cylinder body 2 with a gap. The handwheel 1 can be rotated under the action of external force. The handwheel 1 drives the adjustment member 3 to rotate, and the adjustment member 3 drives the valve stem 5 to move up and down inside the cylinder body 2.

[0065] In one embodiment of the manual adjustment mechanism for the diaphragm valve of the present invention, the manual adjustment mechanism for the diaphragm valve further includes a limiting member 4, which is connected to the handwheel 1.

[0066] The adjusting member 3 has a limiting member cavity 33. The limiting member 4 is slidably connected to the limiting member cavity 33, and the limiting member cavity 33 has a limiting fitting part. The limiting member 4 has a limiting part 40, and the limiting fitting part and the limiting part 40 cooperate to control the movement stroke of the limiting member 4 within the limiting member cavity 33. The cooperation between the limiting fitting part and the limiting part 40 can be achieved through the cooperation between the groove and the protrusion, or through the cooperation between the boss and the protruding edge, or through the cooperation between the retaining ring fixed in the limiting member cavity 33 and the circumferential groove on the limiting member 4.

[0067] The setting of the limiting component 4 can keep the relative position between the handwheel 1 and the adjusting component 3 controllable in the adjusting state, and avoid the problem of the handwheel 1 being completely pulled away from the diaphragm valve.

[0068] Furthermore, in order to better control the volume of the manual adjustment mechanism of the diaphragm valve, the cylinder 2, handwheel 1, adjustment component 3 and limit component 4 are arranged sequentially from the outside to the inside.

[0069] To more clearly illustrate the manual adjustment mechanism of the diaphragm valve of the present invention, the following will use... Figure 3 and Figure 4 The following is an example of an embodiment shown in the figure:

[0070] The manual adjustment mechanism of the diaphragm valve includes a handwheel 1, a cylinder 2, an adjusting component 3, and a limiting component 4, which are arranged sequentially from the outside to the inside.

[0071] The handwheel 1 includes a handwheel body 11 and a mating cavity. The handwheel body 11 has a first cylinder mating part 111 and a fourth adjusting mating part 112, and the inner wall of the mating cavity has a first adjusting mating part 120. The first cylinder mating part 111 is an annular groove on the handwheel body 11, and the second cylinder mating part 21 is an annular protrusion. Both the first adjusting mating part 120 and the fourth adjusting mating part 112 have toothed structures.

[0072] The cylinder body 2 is provided with a second cylinder body mating part 21, a fifth adjusting mating part 22, and a sixth adjusting mating part 23. The second cylinder body mating part 21 is detachably connected to the first cylinder body mating part 111. The fifth adjusting mating part 22 has a toothed structure, and the sixth adjusting mating part 23 is a smooth surface on the inner wall of the cylinder body 2. The fourth adjusting mating part 112 and the fifth adjusting mating part 22 are engaged. The sixth adjusting mating part 23 and the fourth adjusting mating part 112 are clearance-fitted.

[0073] The adjusting component 3 is rotatably connected to the cylinder body 2, and the adjusting component 3 is provided with a second adjusting mating part 31, a third adjusting mating part 32, and a valve stem mating part 340. Both the second adjusting mating part 31 and the valve stem mating part 340 have toothed structures, and the third adjusting mating part 32 is a smooth surface on the outer wall of the adjusting component 3. The second adjusting mating part 31 is in a transmission fit with the first adjusting mating part 120. The third adjusting mating part 32 is in a clearance fit with the first adjusting mating part 120. The third adjusting mating part 32 is located on the side of the second adjusting mating part 31 away from the handwheel 1. The adjusting component 3 is provided with a limiting cavity 33.

[0074] The limiting member 4 is connected to the handwheel 1. The limiting member 4 is slidably connected to the limiting member cavity 33, and a limiting engagement part is provided inside the limiting member cavity 33. The limiting member 4 is provided with a limiting part 40, and the limiting engagement part and the limiting part 40 cooperate to control the movement stroke of the limiting member 4 within the limiting member cavity 33. The cooperation between the limiting engagement part and the limiting part 40 is achieved through the cooperation between the retaining ring fixed inside the limiting member cavity 33 and the circumferential groove on the limiting member 4.

[0075] The valve stem mating part 340 is connected to the valve stem 5 through a bar gear transmission.

[0076] Handwheel 1 has a stationary state and an adjustment state.

[0077] In the stationary state, the first cylinder body mating part 111 and the second cylinder body mating part 31 are engaged, the first adjusting mating part 120 and the third adjusting mating part 32 are engaged, and the fourth adjusting mating part 112 and the fifth adjusting mating part 22 are engaged. In the stationary state, the handwheel 1 and the cylinder body 2 remain relatively stationary and stably engaged, and the valve stem 5 can drive the adjusting member 3 to move up and down within the cylinder body 2.

[0078] In the adjustment state, the first cylinder body mating part 111 and the second cylinder body mating part 31 are separated, the first adjustment mating part 120 and the second adjustment mating part 120 are mated, and the fourth adjustment mating part 112 and the sixth adjustment mating part 23 are mated. In the adjustment state, the handwheel 1 is separated from the cylinder body 2 with a gap, and the handwheel 1 can be rotated under the action of external force. The handwheel 1 drives the adjusting member 3 to rotate, and the adjusting member 3 drives the valve stem 5 to move up and down inside the cylinder body 2.

[0079] In this embodiment, the manual adjustment mechanism for the diaphragm valve is first applied to the handwheel 1 to separate it from the cylinder 2, at which point the handwheel 1 can be rotated. Rotating the handwheel 1 causes the adjusting element 3 to rotate, which in turn causes the valve stem 5 to rotate synchronously, achieving manual adjustment of the valve stem 5's position within the cylinder 2, ultimately resulting in manual closure of the diaphragm valve. Next, force can be applied to the handwheel 1 to re-engage it with the cylinder 2. At this point, the handwheel 1 is positioned on the cylinder 2, and the rotation of the adjusting element 3 does not affect the stationary state of the handwheel 1. When the diaphragm valve returns to normal operation, the valve stem 5 can rotate within the cylinder 2, and the adjusting element 3 is rotated by the valve stem 5 without moving the handwheel 1.

[0080] The present invention also provides an electric diaphragm valve, which includes a valve stem 5 and a manual adjustment mechanism for the diaphragm valve of the present invention, wherein the valve stem 5 is driven to engage with the valve stem mating part 340. In the electric diaphragm valve, the valve stem 5 is driven by an electric drive mechanism to move up and down within the cylinder 2 via a screw drive. At this time, the valve stem mating part 340 can be driven to engage with the valve stem 5, so that when the adjusting member 3 drives the valve stem 5 to rotate within the cylinder 2, the valve stem 5 can move up and down within the cylinder 2 under the thread limit of the screw drive.

[0081] In practice, the valve stem cavity 34 of the regulating component 3 is connected to the limiting component cavity 33, and the inner diameter of the valve stem cavity 34 is larger than the inner diameter of the limiting component cavity 33, so as to limit the valve stem 5 while reducing manufacturing costs.

[0082] In one embodiment of the electric diaphragm valve of the present invention, the electric diaphragm valve further includes a display rod 6. One end of the display rod 6 is fixedly connected to the valve stem 5, and the other end of the display rod 6 passes through the adjusting member 3 and through the handwheel 1. The position of the valve stem 5 in the cylinder body can be obtained by the position of the display rod 6 relative to the end face of the handwheel 1, thereby determining whether the electric diaphragm valve is in the open or closed position.

[0083] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A diaphragm valve hand adjustment mechanism characterized by, Including hand wheel, cylinder and adjusting part, wherein, The hand wheel is provided with a first cylinder matching part and a first adjusting matching part; The cylinder is provided with a second cylinder matching part, which is detachably connected with the first cylinder matching part; The adjusting part is rotationally connected with the cylinder, and is provided with a second adjusting matching part, a third adjusting matching part and a valve rod matching part, the second adjusting matching part is transmissionally matched with the first adjusting matching part, the third adjusting matching part is clearance matched with the first adjusting matching part, and the valve rod matching part is used for being connected with a valve rod; The hand wheel has a static state and an adjusting state; In the static state, the first cylinder matching part and the second cylinder matching part are matched, and the first adjusting matching part and the third adjusting matching part are matched; In the adjusting state, the first cylinder matching part and the second cylinder matching part are separated, and the first adjusting matching part and the second adjusting matching part are matched; The hand wheel comprises a hand wheel body and a matching cavity, the first cylinder matching part is arranged on the hand wheel body, and the first adjusting matching part is arranged on the inner wall of the matching cavity; The cylinder is provided with an adjusting part stop ring, the adjusting part is provided with an adjusting part stop ring groove, and the adjusting part stop ring is matched with the adjusting part stop ring groove; The hand wheel is connected with a limiting part; The adjusting part is internally provided with a limiting part cavity, the limiting part is slidingly and matchingly connected with the limiting part cavity, the limiting part cavity is internally provided with a limiting matching part, the limiting part is provided with a limiting part, and the limiting matching part and the limiting part are matched to control the moving stroke of the limiting part in the limiting part cavity.

2. The diaphragm valve manual adjustment mechanism of claim 1, wherein, The first cylinder matching part is an annular groove arranged on the hand wheel body, and the second cylinder matching part is an annular protrusion.

3. The diaphragm valve manual adjustment mechanism of claim 1, wherein, The first adjusting matching part and the second adjusting matching part both have a toothed structure, and the third adjusting matching part is located on the side of the second adjusting matching part away from the hand wheel.

4. The diaphragm valve manual adjustment mechanism of claim 1, wherein, The hand wheel is further provided with a fourth adjusting matching part, the cylinder is further provided with a fifth adjusting matching part and a sixth adjusting matching part, the fourth adjusting matching part and the fifth adjusting matching part are clamped and matched, and the sixth adjusting matching part and the fourth adjusting matching part are clearance matched; In the static state, the fourth adjusting matching part and the fifth adjusting matching part are matched; In the adjusting state, the fourth adjusting matching part and the sixth adjusting matching part are matched.

5. The diaphragm valve manual adjustment mechanism of claim 1, wherein, The cylinder, the hand wheel, the adjusting part and the limiting part are sequentially arranged from outside to inside.

6. An electric diaphragm valve characterized by The valve rod is transmissionally matched with the valve rod matching part.

7. The motor-operated diaphragm valve of claim 6, wherein, The electric diaphragm valve further comprises a display rod, one end of the display rod is fixedly connected with the valve rod, and the other end of the display rod penetrates through the adjusting part and the hand wheel.

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