A hand-operated diaphragm valve hand wheel limiting device and diaphragm valve

Abstract

The application discloses a kind of manual diaphragm valve hand wheel limiting device and diaphragm valve, the hand wheel inner of former hand wheel mechanism is equipped with first adjusting channel, valve stem and adjusting mechanism are arranged in first adjusting channel, and second adjusting channel and adjusting hole are equipped on valve stem;Adjusting member of adjusting mechanism is equipped with third adjusting channel, adjusting member is arranged in second adjusting channel, and adjusting member is rotatably connected with valve stem, driving member is located in third adjusting channel, and driving member is threadedly connected with adjusting member, first connecting hole is equipped on driving member, limiting member is sleeved on valve stem, and second connecting hole is equipped on limiting member.The manual diaphragm valve hand wheel limiting device of the application can be rotated to the required position of valve stem after first rotating hand wheel, then the moving stroke of hand wheel is adjusted by adjusting limiting member, and hand wheel can effectively avoid diaphragm being excessively extruded by valve stem when driving valve stem to move, with less operation steps and simple operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of manual diaphragm valve adjustment, and more particularly, to a manual diaphragm valve hand wheel limiting device and diaphragm valve. BACKGROUND

[0002] The opening and closing part of the diaphragm valve is a diaphragm, which separates the lower valve body cavity from the upper cylinder or valve cover cavity, so that the valve rod, valve flap and other parts above the diaphragm are not corroded by the medium, and the medium is not leaked.

[0003] The manual diaphragm valve is closed by a hand wheel. In order to avoid the diaphragm being excessively pressed, which reduces the service life of the diaphragm, a limiting structure needs to be provided in the manual diaphragm valve. The limiting structure can be used to limit the position of the hand wheel.

[0004] However, the existing hand wheel limiting structure of the manual diaphragm valve is troublesome to operate, and the hand wheel needs to be disassembled first and then reassembled after adjustment.

[0005] Therefore, how to provide a hand wheel limiting structure of a manual diaphragm valve with fewer operation steps and simple operation has become a technical problem to be solved in the field. SUMMARY

[0006] An object of the present application is to provide a new technical solution of a hand wheel limiting device of a manual diaphragm valve with fewer operation steps and simple operation.

[0007] According to a first aspect of the present application, a hand wheel limiting device of a manual diaphragm valve is provided.

[0008] The hand wheel limiting device of the manual diaphragm valve comprises a hand wheel mechanism and an adjusting mechanism; wherein,

[0009] The hand wheel mechanism comprises a hand wheel and a valve rod, the hand wheel is provided with a first adjusting channel, the valve rod and the adjusting mechanism are arranged in the first adjusting channel, and the valve rod is connected with the hand wheel, the valve rod is provided with a second adjusting channel and an adjusting hole, the second adjusting channel extends along the length direction of the valve rod, and the adjusting hole is arranged on the side wall of the second adjusting channel and extends along the length direction of the valve rod;

[0010] The adjusting mechanism comprises an adjusting member, a driving member, a limiting member and a first connecting member, the adjusting member is internally provided with a third adjusting channel, the adjusting member is arranged in the second adjusting channel, and the adjusting member is rotationally connected with the valve rod, the driving member is located in the third adjusting channel, and the driving member is threadedly connected with the adjusting member, the driving member is provided with a first connecting hole, the limiting member is sleeved on the valve rod, and the limiting member is correspondingly arranged with the adjusting hole, the limiting member is provided with a second connecting hole, and the first connecting member is matched with the first connecting hole, the second connecting hole and the adjusting hole.

[0011] Optionally, the hand wheel comprises a hand wheel handle and a hand wheel rod matched with the valve cover, and the hand wheel rod is provided with a scale line.

[0012] Optionally, the first adjusting channel has an adjusting section and a limiting section, and the limiting section and the adjusting section have a stepped surface therebetween, and the limiting member is located in the limiting section.

[0013] Optionally, the second adjusting channel has an adjusting member limiting section and a driving member matching section, and the adjusting member limiting section and the driving member matching section have a stepped surface therebetween, and the adjusting member is located in the adjusting member limiting section.

[0014] Optionally, the adjusting hole is a waist-shaped hole.

[0015] Optionally, the first connecting member is a fixed pin.

[0016] Optionally, the adjusting mechanism further comprises a second connecting member, and the second connecting member is used for connecting the adjusting member and the valve rod.

[0017] Optionally, the second connecting member is a retaining ring, and the retaining ring is arranged in the second adjusting channel.

[0018] Optionally, the adjusting mechanism further comprises an adjusting wheel, an end surface of the hand wheel is provided with an adjusting wheel cavity, the adjusting wheel cavity is in communication with the first adjusting channel, the adjusting wheel is arranged in the adjusting wheel cavity, and the adjusting wheel is connected with the adjusting member.

[0019] Optionally, the adjusting mechanism further comprises a third connecting member, and the third connecting member is used for connecting the adjusting wheel and the adjusting member.

[0020] Optionally, the third connecting member is a fixed pin.

[0021] Optionally, the adjusting mechanism further comprises a ball head plunger assembly, and the ball head plunger assembly comprises a ball head plunger, a spring and a positioning bead.

[0022] The ball head plunger is installed in the adjusting wheel cavity, the spring and the positioning bead are arranged in the ball head plunger, and the adjusting wheel is provided with a positioning hole matched with the positioning bead.

[0023] According to a second aspect of the present application, there is provided a diaphragm valve.

[0024] The diaphragm valve comprises a valve cover and the manual diaphragm valve hand wheel limiting device of the present application; wherein,

[0025] The valve cover is provided with a limiting device moving cavity, the limiting device moving cavity has an opening, one end of the hand wheel extends into the limiting device moving cavity, and the end surface of the hand wheel and the end surface of the limiting member are arranged opposite to the wall surface of the limiting device moving cavity.

[0026] Optionally, the hand wheel is gap-fitted with the opening of the limiting device moving cavity.

[0027] Optionally, the valve cover comprises a valve cover body and a limiting cover, the valve cover body and the limiting cover are fixedly connected, the limiting device moving cavity is formed by the valve cover body and the limiting cover, and the end surface of the hand wheel and the end surface of the limiting member are arranged opposite to the outer surface of the valve cover body.

[0028] The manual diaphragm valve hand wheel limiting device of the present application can adjust the moving stroke of the hand wheel through the adjusting limiting member after the hand wheel is first rotated to the position where the valve rod is adjusted to the required position, and the diaphragm can be effectively prevented from being excessively pressed by the valve rod when the hand wheel drives the valve rod to move, the operation steps are few, and the operation is simple.

[0029] Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application.

[0031] Figure 1 It is a structural schematic view of the embodiment of the manual diaphragm valve hand wheel limiting device of the present application.

[0032] Figure 2 It is a partial structural schematic view of the embodiment of the manual diaphragm valve hand wheel limiting device of the present application.

[0033] Figure 3 It is a sectional view along A-A direction in Figure 2

[0034] Figure 4 It is an exploded view of Figure 2

[0035] ​​Figure 5 Structure diagram of the embodiment of the diaphragm valve of the present application.

[0036] The symbols in the figures are as follows:

[0037] Hand wheel-1, first adjusting channel-101, adjusting section-1011, limiting section-1012, hand wheel handle-102, hand wheel rod-103, adjusting wheel cavity-104, valve rod-2, second adjusting channel-201, adjusting member limiting section-2011, driving member matching section-2012, adjusting hole-202, adjusting member-3, third adjusting channel-300, driving member-4, first connecting hole-400, limiting member-5, second connecting hole-500, first connecting member-6, second connecting member-7, adjusting wheel-8, third connecting member-9, ball head plunger assembly-10, ball head plunger-1001, spring-1002, positioning bead-1003, valve cover-11, limiting device moving cavity-1101, valve cover body-1102, limiting cover-1103. DETAILED DESCRIPTION

[0038] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of the components and steps set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0039] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the scope of the application its application or uses.

[0040] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and apparatus should be considered as part of the present description.

[0041] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0042] As Figures 1 to 4 shown, the hand wheel limiting device of the manual diaphragm valve of the present application comprises a hand wheel mechanism and an adjusting mechanism.

[0043] The hand wheel mechanism comprises a hand wheel 1 and a valve rod 2.

[0044] The first adjusting channel 101 is provided in the hand wheel 1, the valve rod 2 and the adjusting mechanism are arranged in the first adjusting channel 101, and the valve rod 2 is connected with the hand wheel 1. The connection between the valve rod 2 and the hand wheel 1 can be achieved by a threaded connection or a buckle connection, etc. so that the hand wheel 1 can drive the valve rod 2 to rotate synchronously. In specific implementation, the connection mode which can avoid relative rotation between the hand wheel 1 and the valve rod 2 is preferred.

[0045] The valve stem 2 is provided with a second adjusting channel 201 and an adjusting hole 202. The second adjusting channel 201 extends along the length direction of the valve stem 2. The adjusting hole 202 is arranged on the side wall of the second adjusting channel 201, and the adjusting hole 202 extends along the length direction of the valve stem 2. The adjusting hole 202 is in communication with the second adjusting channel 201.

[0046] The adjusting mechanism comprises an adjusting member 3, a driving member 4, a limiting member 5 and a first connecting member 6.

[0047] The adjusting member 3 is provided with a third adjusting channel 300. The adjusting member 3 is arranged in the second adjusting channel 201, and the adjusting member 3 is rotationally connected with the valve stem 2. The adjusting member 3 and the second adjusting channel 201 can be in clearance fit, so that the adjusting member 3 can rotate smoothly in the second adjusting channel 201 of the valve stem 2. The connection between the adjusting member 3 and the valve stem 2 should be able to rotate the adjusting member 3 in the second adjusting channel 201 while avoiding the adjusting member 3 from coming out of the second adjusting channel 201 of the valve stem 2. Usually, the end of the adjusting member 3 extends out of the second adjusting channel 201, so that the operator can easily apply force to the adjusting member 3.

[0048] The driving member 4 is located in the third adjusting channel 300, and the driving member 4 is threadedly connected with the adjusting member 3. The driving member 4 is provided with a first connecting hole 400. When the adjusting member 3 rotates in the second adjusting channel 201, the driving member 4 is driven by the adjusting member 3 and moves up and down along the third adjusting channel 300.

[0049] The limiting member 5 is sleeved on the valve stem 2, and the limiting member 5 is arranged corresponding to the adjusting hole 202. The limiting member 5 is provided with a second connecting hole 500. The first connecting member 6 cooperates with the first connecting hole 400, the second connecting hole 500 and the adjusting hole 202. The first connecting member 6 can fix the limiting member 5 on the driving member 4, and drive the limiting member 5 to move along the extension direction of the adjusting hole 202 through the driving member 4.

[0050] The hand wheel limiting device for the manual diaphragm valve in the application can adjust the moving stroke of the hand wheel 1 by adjusting the limiting piece 5 after the hand wheel 1 is first rotated to the position required by the valve rod 2, and the hand wheel 1 can effectively avoid the diaphragm being excessively pressed by the valve rod 2 when the hand wheel 1 drives the valve rod 2 to move, which is simple in operation steps and easy to operate.

[0051] When the valve leaks and needs to be completely closed, the hand wheel 1 is first reversely rotated, the hand wheel 1 drives the valve rod 2 to rotate in the valve cover, so that the valve rod 2 drives the diaphragm connecting piece to move away from the diaphragm. When the hand wheel 1 drives the valve rod 2 to move to the limit position, the adjusting piece 3 is forced to reversely rotate in the second adjusting channel 201 of the valve rod 2. With the rotation of the adjusting piece 3, the driving piece 4 moves away from the diaphragm in the second adjusting channel 201. When the driving piece 4 moves, the limiting piece 5 connected with the driving piece 4 through the first connecting piece 6 also moves with the driving piece 4, and the moving stroke of the first connecting piece 6 is limited by the adjusting hole 202. When the limiting piece 5 moves to abut against the valve cover, the limiting piece 5 cannot move any more, and the driving piece 4 and the adjusting piece 3 also stop moving. At this time, the limiting adjustment of the hand wheel 1 of the manual diaphragm valve is completed. When the hand wheel 1 drives the valve rod 2 to move, the moving stroke of the hand wheel 1 is limited by the limiting piece 5, which can effectively avoid the diaphragm being excessively pressed by the valve rod 2.

[0052] The hand wheel limiting device for the manual diaphragm valve in the application can adjust the moving stroke of the hand wheel 1 by adjusting the limiting piece 5 after the hand wheel 1 is first rotated to the position required by the valve rod 2, and the hand wheel 1 can effectively avoid the diaphragm being excessively pressed by the valve rod 2 when the hand wheel 1 drives the valve rod 2 to move, which is simple in operation steps and easy to operate.

[0053] In one embodiment of the hand wheel limiting device for the manual diaphragm valve in the application, the hand wheel 1 comprises a hand wheel handle 102 and a hand wheel rod 103 for cooperating with the valve cover. The hand wheel rod 103 is provided with scale lines. The operator can conveniently force the hand wheel handle 102. The scale lines on the hand wheel rod 103 can be used to obtain the position of the hand wheel 1 relative to the valve cover, so as to accurately adjust the opening of the manual diaphragm valve.

[0054] In particular implementation, the height of the hand wheel lever 103 can be controlled as follows: when the valve is closed, the distance between the hand wheel handle 102 and the valve cover is set to be suitable for the size of an adult's finger, so as to ensure the operation space of the operator and reduce the height of the manual diaphragm valve.

[0055] In an embodiment of the hand wheel limiting device of the manual diaphragm valve, the first adjusting channel 101 has an adjusting section 1011 and a limiting section 1012. The limiting section 1012 has a stepped surface with the adjusting section 1011, and the limiting member 5 is located in the limiting section 1012. The stepped surface between the limiting section 1012 and the adjusting section 1011 can limit the limiting member 5, thereby improving the stability of the manual diaphragm valve.

[0056] In particular implementation, the inner diameter of the adjusting section 1011 can be set to be smaller than that of the limiting section 1012, so as to more reliably control the limiting member 5.

[0057] In an embodiment of the hand wheel limiting device of the manual diaphragm valve, the second adjusting channel 201 has an adjusting member limiting section 2011 and a driving member matching section 2012. The adjusting member limiting section 2011 and the driving member matching section 2012 have a stepped surface, and the adjusting member 3 is located in the adjusting member limiting section 2011. The stepped surface between the adjusting member limiting section 2011 and the driving member matching section 2012 can limit the adjusting member 3, thereby improving the stability of the manual diaphragm valve.

[0058] In particular implementation, the inner diameter of the adjusting member limiting section 2011 can be set to be larger than that of the driving member matching section 2012, so as to more reliably control the adjusting member 3. In addition, the cooperation between the adjusting member 3 and the adjusting member limiting section 2011 can be clearance fit, and the cooperation between the driving member 4 and the driving member matching section 2012 can be sliding fit or clearance fit.

[0059] In an embodiment of the hand wheel limiting device of the manual diaphragm valve, in order to more reliably control the movement of the first connecting member 6 and the limiting member 5, the adjusting hole 202 is a waist-shaped hole. The adjusting holes 202 can be arranged in pairs.

[0060] In an embodiment of the hand wheel limiting device of the manual diaphragm valve, in order to improve the smoothness of the movement of the first connecting member 6 in the adjusting hole 202, the first connecting member 6 is a fixed pin.

[0061] In one embodiment of the manual diaphragm valve hand wheel limiting device of the present disclosure, the adjusting mechanism further comprises a second connecting member 7. The second connecting member 7 is used to connect the adjusting member 3 and the valve stem 2. The second connecting member 7 may, for example, be a retaining ring or a circlip arranged in the second adjusting channel 201, or the second connecting member 7 may be a fixing pin on the end of the adjusting member 3.

[0062] Further, the second connecting member 7 is a retaining ring, and the retaining ring is arranged in the second adjusting channel 201. The retaining ring can position the adjusting member 3 in the second adjusting channel 201 of the valve stem 2 while ensuring that the adjusting member 3 can rotate relative to the valve stem 2. In a specific implementation, the retaining ring can be fixed to the inner wall surface of the second adjusting channel 201 of the valve stem 2, and a sealing ring can be arranged between the retaining ring and the adjusting member 3.

[0063] In one embodiment of the manual diaphragm valve hand wheel limiting device of the present disclosure, the adjusting mechanism further comprises an adjusting wheel 8. The end surface of the hand wheel 1 is provided with an adjusting wheel cavity 104, and the adjusting wheel cavity 104 is in communication with the first adjusting channel 101. The adjusting wheel 8 is arranged in the adjusting wheel cavity 104, and the adjusting wheel 8 is connected to the adjusting member 3. The arrangement of the adjusting wheel 8 facilitates the operator to apply force to the adjusting member 3 more conveniently, thereby improving the convenience of use of the manual diaphragm valve.

[0064] Further, the adjusting mechanism further comprises a third connecting member 9, and the third connecting member 9 is used to connect the adjusting wheel 8 and the adjusting member 3. The third connecting member 9 may, for example, be a bolt or a fixing pin.

[0065] Further, the third connecting member 9 is a fixing pin, so as to improve the convenience of maintenance of the manual diaphragm valve.

[0066] Further, the adjusting mechanism further comprises a ball head plunger assembly 10, and the ball head plunger assembly 10 comprises a ball head plunger 1001, a spring 1002, and a positioning bead 1003.

[0067] The ball head plunger 1001 is installed in the adjusting wheel cavity 104, and the spring 1002 and the positioning bead 1003 are arranged in the ball head plunger 1001. The adjusting wheel 8 is provided with a positioning hole matched with the positioning bead 1003.

[0068] The arrangement of the ball head plunger assembly 10 can effectively avoid misoperation of the adjusting wheel 8.

[0069] In a specific implementation, the adjusting wheel 8 can be fixedly connected with a positioning plate, and the positioning hole is located on the positioning plate.

[0070] In order to more clearly illustrate the manual diaphragm valve hand wheel limiting device of the present disclosure, the following will take the embodiment shown in Figure 1 as an example for illustration:

[0071] The manual diaphragm valve hand wheel limiting device comprises a hand wheel mechanism and an adjusting mechanism.

[0072] The hand wheel mechanism comprises a hand wheel 1 and a valve rod 2.

[0073] The hand wheel 1 further comprises a hand wheel handle 102 and a hand wheel rod 103 for cooperating with a valve cover. The hand wheel rod 103 is provided with scale lines. An end surface of the hand wheel 1 is provided with an adjusting wheel cavity 104, which is in communication with the first adjusting channel 101, and the adjusting wheel cavity 104 is located on the hand wheel handle 102.

[0074] The hand wheel 1 is provided with the first adjusting channel 101 penetrating through the hand wheel handle 102 and the hand wheel rod 103, the valve rod 2 and the adjusting mechanism are arranged in the first adjusting channel 101, and the valve rod 2 is clamped with the hand wheel 1. The first adjusting channel 101 has an adjusting section 1011 and a limiting section 1012. The inner diameter of the adjusting section 1011 is smaller than that of the limiting section 1012, so as to form a stepped surface between the limiting section 1012 and the adjusting section 1011.

[0075] The valve rod 2 is provided with a second adjusting channel 201 and an adjusting hole 202. The second adjusting channel 201 extends along the length direction of the valve rod 2. The second adjusting channel 201 has an adjusting member limiting section 2011 and a driving member matching section 2012. The inner diameter of the adjusting member limiting section 2011 is larger than that of the driving member matching section 2012, so as to form a stepped surface between the adjusting member limiting section 2011 and the driving member matching section 2012. The adjusting hole 202 is arranged on the side wall of the driving member matching section 2012, and extends along the length direction of the valve rod 2. The adjusting hole 202 is in communication with the second adjusting channel 201. The adjusting hole 202 is a waist-shaped hole, and the adjusting hole 202 is arranged in pairs.

[0076] The adjusting mechanism comprises an adjusting member 3, a driving member 4, a limiting member 5, a first connecting member 6, a second connecting member 7, an adjusting wheel 8, a third connecting member 9 and a ball head plunger assembly 10.

[0077] The adjusting member 3 is arranged in the adjusting member limiting section 2011, and the adjusting member 3 is rotationally connected with the valve rod 2. The adjusting member 3 is provided with a third adjusting channel 300. The second connecting member 7 is a check ring arranged in the second adjusting channel 201, and is used for connecting the adjusting member 3 and the valve rod 2.

[0078] The driving member 4 is located in the third adjusting channel 300, and the driving member 4 is threadedly connected with the adjusting member 3. The driving member 4 is provided with a first connecting hole 400.

[0079] The limiting member 5 is sleeved on the valve rod 2, and the limiting member 5 is located in the limiting section 1012. The limiting member 5 is arranged correspondingly to the adjusting hole 202. The limiting member 5 is provided with a second connecting hole 500.

[0080] The first connecting member 6 is a fixed pin. The first connecting member 6 cooperates with the first connecting hole 400, the second connecting hole 500 and the adjusting hole 202.

[0081] The adjusting wheel 8 is arranged in the adjusting wheel cavity 104, and the adjusting wheel 8 is connected with the adjusting member 3 through the third connecting member 9. The third connecting member 9 is a fixed pin.

[0082] The ball plunger assembly 10 comprises a ball plunger 1001, a spring 1002 and a positioning bead 1003. The ball plunger 1001 is arranged in the adjusting wheel cavity 104, and the spring 1002 and the positioning bead 1003 are arranged in the ball plunger 1001. The adjusting wheel 8 is provided with a positioning hole cooperating with the positioning bead 1003.

[0083] In use, the manual diaphragm valve hand wheel limiting device of the embodiment is used as follows: first, rotate the hand wheel 1, the hand wheel 1 drives the valve rod 2 to rotate in the valve cover, so that the valve rod 2 drives the diaphragm connecting member to move, and the opening degree of the manual diaphragm valve is accurately judged through the scale line on the hand wheel rod 103. When the hand wheel 1 is moved to the required opening degree position of the diaphragm valve relative to the valve cover, force is applied to the adjusting wheel 8 and the resistance of the ball plunger assembly 10 is overcome, so that the adjusting member 3 rotates in the second adjusting passage 201 of the valve rod 2. With the rotation of the adjusting wheel 8, the driving member 4 moves in the second adjusting passage 201. When the driving member 4 moves, the limiting member 5 connected with the driving member 4 through the first connecting member 6 also moves with the driving member 4. When the limiting member 5 moves to abut against the valve cover, the limiting member 5 can no longer move, and the driving member 4 and the adjusting member 3 also stop moving. At this time, the limiting adjustment of the hand wheel 1 of the manual diaphragm valve is completed. When the hand wheel 1 drives the valve rod 2 to move, the movement stroke of the hand wheel 1 is limited by the limiting member 5, which can effectively avoid that the diaphragm is excessively pressed by the valve rod 2.

[0084] When valve leakage occurs and the valve needs to be completely closed, first, reverse rotate the hand wheel 1, the hand wheel 1 drives the valve rod 2 to rotate in the valve cover, so that the valve rod 2 drives the diaphragm connecting member to move away from the diaphragm. When the hand wheel 1 drives the valve rod 2 to move to the limit position, force is applied to the adjusting wheel 8 and the resistance of the ball plunger assembly 10 is overcome, so that the adjusting member 3 reversely rotates in the second adjusting passage 201 of the valve rod 2. With the rotation of the adjusting wheel 8, the driving member 4 moves away from the diaphragm in the second adjusting passage 201. When the driving member 4 moves, the limiting member 5 connected with the driving member 4 through the first connecting member 6 also moves with the driving member 4 until the limiting member 5 moves to the limit position. Then, rotate the hand wheel 1 again, the hand wheel 1 drives the valve rod 2 to move towards the diaphragm until the valve is completely closed. Force is applied to the adjusting wheel 8 again, so that the adjusting member 3 rotates in the second adjusting passage 201 of the valve rod 2 until the limiting member 5 moves to abut against the valve cover, and the adjusting member 3, the driving member 4 and the limiting member 5 all stop moving. At this time, the manual diaphragm valve is completely closed.

[0085] As Figure 5 shown, the application also provides a diaphragm valve, comprising a valve cover 11 and the manual diaphragm valve hand wheel limiting device of the application.

[0086] The valve cover 11 is provided with a limiting device moving cavity 1101, and the limiting device moving cavity 1101 has an opening. One end of the hand wheel 1 extends into the limiting device moving cavity 1101, and the end face of the hand wheel 1 and the end face of the limiting piece 5 are arranged opposite to the wall surface of the limiting device moving cavity 1101.

[0087] Rotating the hand wheel 1 can make the hand wheel 1 abut against the wall surface of the limiting device moving cavity 1101, so as to control the moving stroke of the hand wheel 1.

[0088] Rotating the adjusting piece 3 can make the end face of the limiting piece 5 abut against the wall surface of the limiting device moving cavity 1101, so as to control the moving stroke of the limiting piece 5.

[0089] The valve rod 2 is threadedly connected with the valve cover 11, so that when the valve rod 2 is driven to rotate, the valve rod 2 can move in the valve cover 11.

[0090] The diaphragm valve of the application can first rotate the hand wheel 1 to adjust the valve rod 2 to the required position, and then adjust the moving stroke of the hand wheel 1 through the limiting piece 5, so that the hand wheel 1 can effectively avoid the diaphragm being excessively pressed by the valve rod 2 when the valve rod 2 is driven to move, and the operation steps are less and the operation is simple.

[0091] In an embodiment of the diaphragm valve of the application, the hand wheel 1 is gap-fitted with the opening of the limiting device moving cavity 1101. This fitting mode between the hand wheel 1 and the valve cover 11 can more conveniently rotate the hand wheel 1 and improve the convenience of operation.

[0092] In an embodiment of the diaphragm valve of the application, in order to more conveniently maintain the diaphragm valve, the valve cover 11 comprises a valve cover body 1102 and a limiting cover 1103. The valve cover body 1102 and the limiting cover 1103 are fixedly connected. The fixed connection between the valve cover body 1102 and the limiting cover 1103 can be realized by bolt connection or welding.

[0093] The limiting device moving cavity 1101 is composed of the valve cover body 1102 and the limiting cover 1103. The end face of the hand wheel 1 and the end face of the limiting piece 5 are arranged opposite to the outer surface of the valve cover body 1102.

[0094] In order to more clearly illustrate the diaphragm valve of the application, the following will take the embodiment shown in the Figure 5 as an example for illustration:

[0095] The diaphragm valve comprises a valve cover 11 and a manual diaphragm valve hand wheel limiting device.

[0096] The valve cover 11 comprises a valve cover body 1102 and a limiting cover 1103. The valve cover body 1102 and the limiting cover 1103 are bolted. The valve cover body 1102 and the limiting cover 1103 constitute a limiting device moving cavity 1101, and the limiting device moving cavity 1101 has an opening.

[0097] The manual diaphragm valve hand wheel limiting device comprises a hand wheel mechanism and an adjusting mechanism.

[0098] The hand wheel mechanism comprises a hand wheel 1 and a valve rod 2.

[0099] The hand wheel 1 comprises a hand wheel handle 102 and a hand wheel rod 103 for cooperating with the valve cover. The hand wheel rod 103 is provided with a scale line. An adjusting wheel cavity 104 is arranged on the end face of the hand wheel 1, the adjusting wheel cavity 104 is connected with the first adjusting channel 101, and the adjusting wheel cavity 104 is located on the hand wheel handle 102. The hand wheel rod 103 extends into the limiting device moving cavity 1101, and the end face of the hand wheel rod 103 is arranged opposite to the outer surface of the valve cover body 1102. The hand wheel rod 103 is gap-fitted with the opening of the limiting device moving cavity 1101.

[0100] The first adjusting channel 101 is arranged in the hand wheel 1 and penetrates the hand wheel handle 102 and the hand wheel rod 103. The valve rod 2 and the adjusting mechanism are arranged in the first adjusting channel 101, and the valve rod 2 is clamped with the hand wheel 1. The first adjusting channel 101 has an adjusting section 1011 and a limiting section 1012. The inner diameter of the adjusting section 1011 is smaller than that of the limiting section 1012, so as to form a stepped surface between the limiting section 1012 and the adjusting section 1011.

[0101] The valve rod 2 is provided with a second adjusting channel 201 and an adjusting hole 202. The second adjusting channel 201 extends along the length direction of the valve rod 2. The second adjusting channel 201 has an adjusting member limiting section 2011 and a driving member matching section 2012. The inner diameter of the adjusting member limiting section 2011 is larger than that of the driving member matching section 2012, so as to form a stepped surface between the adjusting member limiting section 2011 and the driving member matching section 2012. The adjusting hole 202 is arranged on the side wall of the driving member matching section 2012 and extends along the length direction of the valve rod 2. The adjusting hole 202 is connected with the second adjusting channel 201. The adjusting hole 202 is a waist-shaped hole, and the adjusting hole 202 is arranged in pairs.

[0102] The adjusting mechanism comprises an adjusting member 3, a driving member 4, a limiting member 5, a first connecting member 6, a second connecting member 7, an adjusting wheel 8, a third connecting member 9 and a ball head plunger assembly 10.

[0103] The adjusting member 3 is arranged in the adjusting member limiting section 2011 and is rotationally connected with the valve rod 2. The adjusting member 3 is provided with a third adjusting channel 300. The second connecting member 7 is a stop ring arranged in the second adjusting channel 201 and used for connecting the adjusting member 3 and the valve rod 2.

[0104] The driving component 4 is located within the third adjustment channel 300, and the driving component 4 is threadedly connected to the adjustment component 3. The driving component 4 is provided with a first connecting hole 400.

[0105] The limiting member 5 is sleeved outside the valve stem 2 and located inside the limiting section 1012. The limiting member 5 is correspondingly provided with the adjusting hole 202. The limiting member 5 is provided with a second connecting hole 500. The end face of the limiting member 5 is positioned opposite to the outer surface of the valve cover body 1102.

[0106] The first connecting piece 6 is a fixing pin. The first connecting piece 6 mates with the first connecting hole 400, the second connecting hole 500, and the adjusting hole 202.

[0107] The adjusting wheel 8 is disposed within the adjusting wheel cavity 104, and the adjusting wheel 8 is connected to the adjusting member 3 via the third connecting member 9. The third connecting member 9 is a fixing pin.

[0108] The ball plunger assembly 10 includes a ball plunger 1001, a spring 1002, and a positioning bead 1003. The ball plunger 1001 is installed inside the adjusting wheel cavity 104, and the spring 1002 and the positioning bead 1003 are both disposed inside the ball plunger 1001. The adjusting wheel 8 is provided with a positioning hole that mates with the positioning bead 1003.

[0109] In this embodiment, when the diaphragm valve is in use, first rotate the handwheel 1. The handwheel 1 drives the valve stem 2 to rotate within the valve cover 11, causing the valve stem 2 to move the diaphragm connector. The opening degree of the manual diaphragm valve is accurately determined by the scale lines on the handwheel stem 103. When the handwheel 1 moves relative to the valve cover 11 to the desired opening degree of the diaphragm valve, force is applied to the adjusting wheel 8 to overcome the resistance of the ball plunger assembly 10, causing the adjusting member 3 to rotate within the second adjusting channel 201 of the valve stem 2. As the adjusting wheel 8 rotates, the driving member 4 moves within the second adjusting channel 201. When the driving member 4 moves, the limiting member 5, which is connected to the driving member 4 via the first connecting member 6, also moves with the driving member 4. When the limiting member 5 moves to abut against the surface of the valve cover body 1102, the limiting member 5 can no longer move, and the driving member 4 and the adjusting member 3 also stop moving. At this point, the limiting adjustment of the handwheel 1 of the manual diaphragm valve is completed. When the handwheel 1 drives the valve stem 2 to move, the movement of the handwheel 1 is limited by the limiting component 5, which can effectively prevent the diaphragm from being excessively squeezed by the valve stem 2.

[0110] When valve leakage occurs, and the valve needs to be closed completely, first reverse rotate the hand wheel 1, the hand wheel 1 drives the valve stem 2 to rotate in the valve cover 11, so that the valve stem 2 drives the diaphragm connecting piece to move in the direction away from the diaphragm. When the hand wheel 1 drives the valve stem 2 to move to the limit position, force is applied to the adjusting wheel 8 and overcomes the resistance of the ball plunger assembly 10, so that the adjusting member 3 reversely rotates in the second adjusting channel 201 of the valve stem 2. With the rotation of the adjusting wheel 8, the driving member 4 moves in the second adjusting channel 201 in the direction away from the diaphragm. When the driving member 4 moves, the limiting member 5 connected with the driving member 4 through the first connecting member 6 also moves with the driving member 4 until the limiting member 5 moves to the limit position. Then, rotate the hand wheel 1 again, the hand wheel 1 drives the valve stem 2 to move in the direction close to the diaphragm, and the hand wheel stem 103 abuts against the outer surface of the valve cover body 1102 to close the valve. Then, force is applied to the adjusting wheel 8, so that the adjusting member 3 positively rotates in the second adjusting channel 201 of the valve stem 2 until the limiting member 5 abuts against the outer surface of the valve cover body 1102, and the adjusting member 3, the driving member 4 and the limiting member 5 all stop moving. At this time, the manual diaphragm valve is completely closed.

[0111] Although some specific embodiments of the present application have been described in detail by way of example with reference to the drawings, it is to be understood that the examples are for illustrative purposes only and are not to be construed as limiting the scope of the present application. It is to be understood that modifications can be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A manual diaphragm valve handwheel limiting device, characterized in that, Includes a handwheel mechanism and an adjustment mechanism; among which, The handwheel mechanism includes a handwheel and a valve stem. The handwheel has a first adjustment channel, and the valve stem and the adjustment mechanism are disposed in the first adjustment channel. The valve stem is connected to the handwheel so that the valve stem rotates synchronously with the handwheel. The valve stem has a second adjustment channel and an adjustment hole. The second adjustment channel extends along the length of the valve stem, and the adjustment hole is disposed on the side wall of the second adjustment channel and extends along the length of the valve stem. The adjusting mechanism includes an adjusting component, a driving component, a limiting component, and a first connecting component. The adjusting component has a third adjusting channel and is disposed within a second adjusting channel. The adjusting component is rotatably connected to the valve stem. The driving component is located within the third adjusting channel and is threadedly connected to the adjusting component. The driving component has a first connecting hole. The limiting component is sleeved on the valve stem and is correspondingly disposed to the adjusting hole. The limiting component has a second connecting hole. The first connecting component cooperates with the first connecting hole, the second connecting hole, and the adjusting hole. The handwheel includes a handwheel handle and a handwheel lever for engaging with the valve cover, the handwheel lever having scale lines on it; The adjustment hole is a waist-shaped hole.

2. The manual diaphragm valve handwheel limiting device according to claim 1, characterized in that, The first adjustment channel has an adjustment section and a limiting section, and there is a stepped surface between the limiting section and the adjustment section. The limiting member is located within the limiting section.

3. The manual diaphragm valve handwheel limiting device according to claim 1, characterized in that, The second adjustment channel has an adjustment member limiting section and a driving member mating section, with a stepped surface between the adjustment member limiting section and the driving member mating section, and the adjustment member is located within the adjustment member limiting section.

4. The manual diaphragm valve handwheel limiting device according to claim 1, characterized in that, The first connecting component is a fixing pin.

5. The manual diaphragm valve handwheel limiting device according to claim 1, characterized in that, The adjusting mechanism further includes a second connector for connecting the adjusting member and the valve stem.

6. The manual diaphragm valve handwheel limiting device according to claim 5, characterized in that, The second connector is a retaining ring, and the retaining ring is disposed within the second adjustment channel.

7. The manual diaphragm valve handwheel limiting device according to any one of claims 1 to 6, characterized in that, The adjustment mechanism further includes an adjustment wheel, and the end face of the handwheel is provided with an adjustment wheel cavity. The adjustment wheel cavity is connected to the first adjustment channel. The adjustment wheel is disposed in the adjustment wheel cavity and is connected to the adjustment component.

8. The manual diaphragm valve handwheel limiting device according to claim 7, characterized in that, The adjustment mechanism further includes a third connector for connecting the adjustment wheel and the adjustment member.

9. The manual diaphragm valve handwheel limiting device according to claim 8, characterized in that, The third connector is a fixing pin.

10. The manual diaphragm valve handwheel limiting device according to claim 7, characterized in that, The adjustment mechanism further includes a ball plunger assembly, which includes a ball plunger, a spring, and a positioning ball. The ball plunger is installed inside the adjusting wheel cavity, the spring and the positioning bead are both located inside the ball plunger, and the adjusting wheel is provided with a positioning hole that cooperates with the positioning bead.

11. A diaphragm valve, characterized in that, Includes a valve cover and a manual diaphragm valve handwheel limiting device as described in any one of claims 1 to 10; wherein, The valve cover is provided with a limiting device moving cavity, the limiting device moving cavity has an opening, one end of the handwheel extends into the limiting device moving cavity, and the end face of the handwheel and the end face of the limiting member are both arranged opposite to the wall surface of the limiting device moving cavity.

12. The diaphragm valve according to claim 11, characterized in that, The handwheel is fitted with the opening of the moving cavity of the limiting device with a clearance.

13. The diaphragm valve according to claim 11, characterized in that, The valve cover includes a valve cover body and a limiting cover. The valve cover body and the limiting cover are fixedly connected. The moving cavity of the limiting device is formed by the valve cover body and the limiting cover. The end face of the handwheel and the end face of the limiting member are both arranged opposite to the outer surface of the valve cover body.

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