Diaphragm valve driven by worm gear and worm and having position signal feedback function

Abstract

The utility model relates to a diaphragm valve driven by a worm and gear and having a signal feedback function. The diaphragm valve is characterized in that the other end of a valve rod penetrates through a valve cover and a worm and gear mechanism and is connected with a position feedback mechanism; the outer side wall of the valve rod and the valve cover are arranged in a spaced mode, but the valve rod is in threaded connection with the worm and gear mechanism. Under driving of the worm and gear mechanism, the diaphragm piece can be driven to open or close the valve body, and the position feedback mechanism synchronously sends out real-time position signals of the diaphragm piece. The diaphragm valve has the advantages that one end of the valve rod penetrates through the worm and gear mechanism, is in threaded connection with the worm and gear mechanism and is connected with the position feedback mechanism, the valve rod can be prevented from axially moving at the moment when the diaphragm piece is opened or closed, and the working stability of the diaphragm valve is improved; the situation that the diaphragm valve shakes or vibrates due to the electric hammer effect generated at the moment when the diaphragm piece is opened or closed is avoided, the accuracy of the contact reliability of the valve rod and the position feedback mechanism is guaranteed, and the use safety performance of the diaphragm valve is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a control valve, more specifically relates to a diaphragm valve of application worm and gear drive and with signal feedback function mainly applied to chemical industry, pharmacy, food and the like field. BACKGROUND

[0002] The existing diaphragm valve with position signal feedback mostly adopts non-contact proximity switch to carry out position signal feedback, and the proximity switch is basically connected and fixed with the valve body through screw thread. When the diaphragm valve is used, the diaphragm is perpendicular to the flow direction of medium in the pipeline, and in the moment of opening or closing the diaphragm, the medium pressure will impact the diaphragm to make the diaphragm valve shake or vibrate, so that the proximity switch fixed on the valve body through screw thread connection will also shake or vibrate correspondingly, which makes the proximity switch send false position signal feedback, especially when the diaphragm is not completely closed but the proximity switch sends closing signal, which causes certain safety hazard of the diaphragm valve. SUMMARY

[0003] In order to solve the technical defects such as false position signal of the existing diaphragm valve with position signal feedback, the utility model provides a diaphragm valve of application worm and gear drive and with position signal feedback, which is driven by worm and gear, can effectively avoid shaking or vibration of the diaphragm valve in the moment of opening or closing the diaphragm, ensure the accuracy of position signal feedback, and improve the use safety of the diaphragm valve.

[0004] In order to solve the above technical problems, the utility model takes the technical scheme of a diaphragm valve of application worm and gear drive and with position signal feedback function, which comprises a valve body, a valve cover, a valve rod and a diaphragm, the diaphragm is between the valve body and the valve cover and the valve cover is sealingly connected with the valve body, one end of the valve rod is connected and fixed with the diaphragm, the other end of the valve rod penetrates the valve cover and the worm and gear mechanism and is connected with the position feedback mechanism, the outer wall of the valve rod is spaced apart from the valve cover but is screw-connected with the worm and gear mechanism, and under the driving of the worm and gear mechanism, the diaphragm can be opened or closed to the valve body and the position feedback mechanism can send real-time position signal of the diaphragm at the same time.

[0005] Preferably, the worm and gear mechanism comprises a hand wheel, a worm, a worm wheel and a base, the base is installed on the valve cover, the worm chamber and the worm wheel chamber are communicated with each other in the base, the worm wheel is coaxially arranged with the valve rod and is placed in the worm wheel chamber, the worm axis is perpendicular to the valve rod axis and one end of the worm is placed in the worm chamber and engaged with the worm wheel, the other end of the worm is placed outside the base and fixed with the hand wheel, when the hand wheel is driven to rotate forward and backward by external force, the worm drives the worm wheel to rotate forward and backward along the valve rod axis synchronously to make the valve rod rise and fall to open or close the diaphragm.

[0006] Preferably, the outer side wall of the worm and the outer side wall of the worm wheel are provided with double thread respectively and are engaged with each other to synchronize the worm wheel with the worm.

[0007] Preferably, the abutting surface of the base and the valve cover is provided with a limiting ring, and an annular boss is arranged on the opposite surface of the valve cover, and the limiting ring is arranged on the annular boss to form radial limiting of the base relative to the valve cover.

[0008] Preferably, a three-line external thread is arranged on the outer side wall of the valve rod, an inner hole is arranged on the worm wheel, and a three-line internal thread is arranged on the inner wall of the inner hole, the valve rod passes through the worm wheel, and the three-line external thread is engaged with the three-line internal thread in the worm wheel, so that the valve rod can be lifted or lowered to open or close the diaphragm when the worm wheel rotates in the forward or reverse direction.

[0009] Preferably, a limiting piece is arranged on the outer side wall of the valve rod, and the limiting piece is in contact with the worm wheel to form axial limiting of the valve rod after closing the diaphragm.

[0010] Preferably, the position feedback mechanism comprises a shell, a striker, a contact switch and a signal feedback element, one end of the striker is connected with the valve rod, the other end of the striker extends into the shell and is provided with two spaced apart striker blocks at a preset distance, the contact switch and the signal feedback element are respectively provided with two and are fixed in the upper and lower ends of the shell, and when the striker rises and falls along with the valve rod, the striker blocks spaced apart on the striker can respectively touch the contact switches in the upper and lower ends of the shell, and the corresponding signal feedback element can emit a position signal in real time.

[0011] Preferably, the end of the shell in contact with the base is provided with a convex upper limiting ring and is inserted into the base, a coaxial lower limiting ring is arranged at the bottom of the base, two needle bearings are respectively arranged at the two ends of the worm wheel, and the two needle bearings are respectively in interference fit with the inner walls of the upper limiting ring and the lower limiting ring.

[0012] Preferably, the diaphragm comprises a valve core seat and an elastic piece, the elastic piece is arranged between the valve body and the valve cover around the valve core seat to seal and connect the valve core seat and the valve cover, and a floating nut is arranged between the valve core seat and the elastic piece to form detachable connection and fixation.

[0013] Preferably, a transparent cover is arranged on the shell, and the position signal emitted by the signal feedback element is a light signal.

[0014] The beneficial effects of the utility model are:

[0015] 1. The valve stem is arranged at one end to pass through the worm gear mechanism and is screwed with the worm gear mechanism, and is connected with the position feedback mechanism, when it is needed to open or close the diaphragm valve, rotating the worm gear mechanism can drive the valve stem to rise or fall along its axis, so that the diaphragm opens or closes the valve body; the worm gear mechanism can not only prevent the axial movement of the valve stem at the moment of opening or closing the diaphragm, but also improve the stability of the diaphragm valve; at the same time, the transmission process of the worm gear mechanism is more stable, the impact force and the working noise are smaller, so that the larger speed reduction or speed increasing effect can be realized, which is suitable for the use requirement under the condition of transmitting larger torque, and the service life of the diaphragm valve is improved.

[0016] 2. When the valve stem is driven to rise or fall by the worm gear mechanism, the valve stem can also make the position feedback mechanism display the state of the diaphragm in real time, and the contact between the valve stem and the position feedback mechanism is more stable and reliable due to the blockage of the worm gear mechanism, so that the shaking or vibration of the diaphragm valve caused by the electric hammer effect of the diaphragm at the moment of opening or closing is avoided, the accuracy of the contact reliability of the valve stem and the position feedback mechanism is ensured, and the safety performance of the diaphragm valve is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 the diaphragm valve driven by a worm gear and having a position signal feedback function

[0018] Figure 2 the diaphragm valve driven by a worm gear and having a position signal feedback function

[0019] Figure 3 the diaphragm valve driven by a worm gear and having a position signal feedback function DETAILED DESCRIPTION

[0020] The diaphragm valve driven by a worm gear and having a position signal feedback function Figure 1 ~ 3 further illustrate the embodiments of the diaphragm valve driven by a worm gear and having a position signal feedback function

[0021] The diaphragm valve driven by a worm gear and having a position signal feedback function, comprising a valve body 1, a valve cover 2, a valve stem 3 and a diaphragm 4, a medium inlet and a medium outlet are arranged in the valve body 1, the diaphragm 4 is arranged between the valve body 1 and the valve cover 2, and the valve cover 2 is sealingly connected with the valve body 1, one end of the valve stem 3 is connected with the diaphragm 4, the other end of the valve stem 3 passes through the valve cover 2 and the worm gear mechanism 5 and is connected with the position feedback mechanism 6, the outer wall of the valve stem 3 is arranged apart from the valve cover 2 and is screwed with the worm gear mechanism 5, and under the driving of the worm gear mechanism 5, the diaphragm 4 can be driven to open or close the valve body 1, and the position feedback mechanism 6 can synchronously send the real-time position signal of the diaphragm 4. The outer wall of the valve stem 3 is arranged apart from the valve cover 2, so that the valve cover 2 can not interfere with the valve stem 3 when the valve stem 3 rises or falls.

[0022] Because the worm gear mechanism 5 has good transmission ratio and large carrying capacity, one end of the valve stem 3 is arranged to pass through the worm gear mechanism 5 and is threadedly connected with the worm gear mechanism 5, and is connected with the position feedback mechanism 6. When it is needed to open or close the diaphragm valve, rotating the worm gear mechanism 5 can drive the valve stem 3 to ascend or descend along the axis, so as to open or close the diaphragm plate 4. The worm gear mechanism 5 can not only prevent the valve stem 3 from axial movement at the moment of opening or closing of the diaphragm plate 4, but also can improve the working stability of the diaphragm valve. At the same time, the transmission process of the worm gear mechanism 5 is more stable, the impact force and the working noise are smaller, so that the large speed reduction or speed increase effect can be realized, which is suitable for the use requirement under the condition of large torque transmission, and the service life of the diaphragm valve is improved.

[0023] Secondly, when the valve stem 3 is driven to ascend or descend by the worm gear mechanism 5, the valve stem 3 can also make the position feedback mechanism 6 display the state of the diaphragm plate 4 in real time. Moreover, due to the blockage of the worm gear mechanism 5, the contact between the valve stem 3 and the position feedback mechanism 6 is more stable and reliable, which avoids the shaking or vibration of the diaphragm valve due to the electric hammer effect of the diaphragm plate 4 at the moment of opening or closing, and ensures the accuracy of the contact reliability of the valve stem 3 and the position feedback mechanism 6, and improves the safety performance of the diaphragm valve.

[0024] In the specific embodiment, the worm gear mechanism 5 comprises a hand wheel 51, a worm 52, a worm gear 53 and a base 54. The base 54 is installed on the valve cover 2, and the worm chamber 55 and the worm gear chamber 56 which are in communication with each other are arranged in the base 54. The worm gear 53 is coaxially arranged with the valve stem 3 and is arranged in the worm gear chamber 56. The axis of the worm 52 is perpendicular to the axis of the valve stem 3, and one end of the worm 52 is arranged in the worm chamber 55 and is engaged with the worm gear 53. The other end of the worm 52 is arranged outside the base 54 and is fixed with the hand wheel 51. When the hand or other external force drives the hand wheel 51 to rotate forward or reversely, the worm 52 synchronously drives the worm gear 53 to rotate forward or reversely along the axis of the valve stem 3, so as to ascend or descend the valve stem 3 to open or close the diaphragm plate 4. By adopting this structure, the worm gear 53 can be coaxially installed with the valve stem 3 and arranged outside the valve stem 3, so that the worm gear 53 can press the valve stem 3 to prevent the axial movement of the valve stem 3 when the electric hammer effect occurs. This not only improves the working stability of the diaphragm valve, but also avoids the error signal of the position feedback mechanism 6 caused by the change of the position of the valve stem 3, so as to mislead the production workers and improve the safety of the equipment.

[0025] In order to improve the working stability of the worm gear mechanism 5, the outer side wall of the worm 52 and the outer side wall of the worm gear 53 are respectively provided with double thread and are engaged with each other, so that the worm gear 53 is synchronously linked with the worm 52. Because the double thread has high torque, large lead and anti-loosening performance, the worm gear 53 and the worm 52 adopt the double thread as the preferred embodiment.

[0026] To prevent displacement when rotating the worm 52 to drive the worm gear 53 to rotate the valve stem 3 and the diaphragm 4 to open or close the valve, the base 54 is provided with a limiting ring on the surface abutting the bonnet 2, and the bonnet 2 is provided with an annular boss 21 on the opposite surface, and the limiting ring is arranged on the annular boss 21 to limit the base 54 relative to the bonnet 2 in the radial direction. By arranging the annular boss 21 and the limiting ring on the bonnet 2 and the base 54 respectively, when the hand wheel 51 is manually rotated to drive the worm 52 to rotate the worm gear 53, the annular boss 21 can limit the limiting ring, thereby preventing the base 54 from moving relative to the bonnet 2 in the radial direction, ensuring the coaxiality of the installation of the worm gear 53 and the valve stem 3, and thus improving the stability of the rising and falling of the valve stem 3.

[0027] The diaphragm 4 is easily affected by the medium pressure to form a water hammer effect to cause the valve stem 3 to move axially at the moment of opening or closing the valve body 1, and the valve stem 3 is provided with a three-line external thread 31 on the outer wall, the worm gear 53 is provided with an inner hole 531, and the inner hole 531 is provided with a three-line internal thread 532 on the inner wall, the valve stem 3 passes through the worm gear 53, and the three-line external thread 31 of the valve stem 3 is engaged with the three-line internal thread 532 in the worm gear 53, so that the valve stem 3 can rise or fall to open or close the diaphragm 4 when the worm gear 53 rotates in the forward or reverse direction. The three-line thread is used for the transmission cooperation between the valve stem 3 and the worm gear 53, which not only can realize the function of large lead and fast opening and closing of the diaphragm 4, but also can improve the tightness and firmness of the transmission structure between the valve stem 3 and the worm gear 53 by using the engagement of the three-line thread, thereby effectively avoiding the axial movement of the valve stem 3 under non-human control conditions, and preventing the irregular movement of the valve stem 3 from mistakenly touching the position feedback mechanism 6, and ensuring the accuracy of the signal feedback of the position feedback mechanism 6.

[0028] To avoid damage to the diaphragm 4 due to excessive extrusion when closing the diaphragm 4, a limiting piece 32 is arranged on the outer wall of the valve stem 3, and the limiting piece 32 is in contact with the worm gear 53 to limit the axial movement of the valve stem 3 after closing the diaphragm 4. By arranging the limiting piece 32 on the worm 52 and the limiting step 533 on the worm gear 53, when the worm gear 53 rotates to drive the valve stem 3 to move axially downward to close the diaphragm 4, if the limiting piece 32 contacts the limiting step 533, the valve stem 3 cannot continue to move downward, thereby avoiding excessive extrusion of the diaphragm 4 by the valve stem 3, and ensuring the safety of the diaphragm 4. In actual production, the distance between the limiting piece 32 and the limiting step 533 is equal to the stroke of the valve stem 3 in closing the diaphragm 4.

[0029] In specific embodiments, the position feedback mechanism 6 comprises a housing 61, a striker 62, a contact switch 63 and a signal feedback element 64, one end of the striker 62 is connected with the valve rod 3, the other end extends into the housing 61 and is provided with two spaced apart striker blocks 65 at a predetermined distance, the contact switch 63 and the signal feedback element 64 are respectively provided with two and fixed at the upper and lower ends of the housing 61, and when the striker 62 rises and falls with the valve rod 3, the striker blocks 65 spaced apart on the striker 62 can respectively touch the contact switches 63 at the upper and lower ends of the housing 61, and the corresponding signal feedback element 64 can send a position signal in real time. The contact switch 63 and the striker block 65 are used to trigger the signal transmission, which is more reliable than the proximity switch and the position signal is more accurate.

[0030] In order to improve the installation coaxiality of the valve rod 3, the worm gear 53 and the position feedback mechanism 6, the end of the housing 61 in contact with the base 54 is provided with a protruding upper positioning ring 611 inserted into the base 54, and the bottom of the base 54 is provided with a coaxial lower positioning ring 541, the worm gear 53 is respectively sleeved with a needle bearing 57 at both ends, and the two needle bearings 57 are respectively in interference fit with the inner walls of the upper positioning ring 611 and the lower positioning ring 541. Since the valve rod 3 and the worm gear 53 are driven by three-threaded screws, the installation coaxiality of the worm gear 53 and the valve rod 3 is ensured; the upper positioning ring 611 is arranged on the housing 61 and the lower positioning ring 541 is arranged on the base 54, and the needle bearings 57 are respectively arranged at the upper and lower ends of the worm gear 53, and the needle bearings 57 are respectively arranged in the upper positioning ring 611 and the lower positioning ring 541, which not only reduces the torque of the worm gear 53 rotation, realizes the purpose of the valve rod 3 fast rising and falling to open or close the diaphragm 4, but also improves the coaxiality of the position feedback mechanism 6 and the worm gear and worm mechanism 5 with the valve rod 3, and ensures the stability and accuracy of the valve rod 3 and the diaphragm 4 opening or closing.

[0031] In order to facilitate the production, assembly and replacement of the diaphragm 4, the diaphragm 4 comprises a valve core seat 41 and an elastic sheet 42, the elastic sheet 42 is arranged between the valve body 1 and the valve cover 2 around the valve core seat 41, and the valve core seat 41 and the elastic sheet 42 are connected and fixed by a floating nut. The diaphragm 4 is of a split structure, when the diaphragm 4 is damaged or naturally aged, only the elastic sheet 42 needs to be removed, and the use and maintenance cost is lower. The floating nut is arranged between the valve core seat 41 and the elastic sheet 42, after the diaphragm 4 is opened, the elastic sheet 42 has a certain elastic deformation space, which can effectively improve the fatigue resistance of the elastic sheet 42 and prolong the service life of the elastic sheet 42. Therefore, the floating nut is a mature technology, which is not described in detail here.

[0032] In order to facilitate the real-time identification of the operator, the transparent cover 66 is sleeved on the shell 61, the position signal emitted by the signal feedback element 64 is an optical signal, that is, when the contact block on the valve rod 3 physically contacts or separates from the contact switch 63, the signal feedback element 64 immediately synchronously emits different color LED lights, so that the operator can observe the real-time position of the diaphragm 4 in real time. Of course, an acoustic signal can also be added, for example, when the contact block in the valve rod 3 contacts or separates from the contact switch 63, different sounds are emitted, which can also serve as a real-time feedback position signal of the diaphragm 4. The specific setting can be determined according to the actual working place, and the present embodiment is not limited further. Secondly, the transparent cover 66 can also play a dustproof role, preventing dust or sundries from causing damage to or affecting the contact switch 63 and the signal feedback element 64, resulting in a position signal error.

[0033] The above embodiments should not be considered as limiting the present application, but any improvement based on the spirit of the present application should be within the scope of protection of the present application.

Claims

1. A diaphragm valve with worm gear drive and position signal feedback function, comprising a valve body (1), a valve cover (2), a valve stem (3) and a diaphragm (4), the diaphragm (4) being between the valve body (1) and the valve cover (2) and the valve cover (2) being sealingly connected with the valve body (1), the valve stem (3) being fixedly connected with the diaphragm (4) at one end; characterized in that The other end of the valve rod (3) penetrates the valve cover (2) and the worm gear mechanism (5) and is connected with the position feedback mechanism (6); the outer wall of the valve rod (3) is arranged apart from the valve cover (2) but is threadedly connected with the worm gear mechanism (5), and is driven by the worm gear mechanism (5) to drive the diaphragm (4) to open or close the valve body (1) and make the position feedback mechanism (6) synchronously send the real-time position signal of the diaphragm (4).

2. The diaphragm valve according to claim 1, wherein The worm gear mechanism (5) comprises a hand wheel (51), a worm (52), a worm gear (53) and a base (54), the base (54) is installed on the valve cover (2), and the worm gear chamber (56) and the worm chamber (55) are arranged in the base (54) and are communicated with each other, the worm gear (53) is coaxially arranged with the valve rod (3) and is arranged in the worm gear chamber (56), the axis of the worm (52) is perpendicular to the axis of the valve rod (3), one end of the worm (52) is arranged in the worm chamber (55) and is engaged with the worm gear (53), the other end of the worm (52) is arranged outside the base (54) and is fixed with the hand wheel (51), when the hand wheel (51) is driven to rotate in the positive direction or the reverse direction, the worm (52) synchronously drives the worm gear (53) to rotate in the positive direction or the reverse direction along the axis of the valve rod (3) to drive the valve rod (3) to ascend or descend and open or close the diaphragm (4).

3. The diaphragm valve according to claim 2, characterized in that The outer wall of the worm (52) and the outer wall of the worm gear (53) are respectively provided with double thread and are engaged with each other to make the worm gear (53) synchronously link with the worm (52).

4. The diaphragm valve according to claim 2, characterized in that The surface of the base (54) abutting with the valve cover (2) is provided with a limiting ring, the opposite surface of the valve cover (2) is provided with an annular boss (21), and the limiting ring is arranged on the annular boss (21) to form the radial limiting of the base (54) relative to the valve cover (2).

5. The diaphragm valve according to claim 2, characterized in that The outer wall of the valve rod (3) is provided with a three-line external thread (31), the worm gear (53) is provided with an inner hole (531) and a three-line internal thread (532) on the inner wall of the inner hole (531), the valve rod (3) penetrates the worm gear (53) and the three-line external thread (31) of the valve rod (3) is engaged with the three-line internal thread (532) in the worm gear (53), so that the valve rod (3) can ascend or descend to open or close the diaphragm (4) when the worm gear (53) rotates in the positive direction or the reverse direction.

6. The diaphragm valve according to claim 2, characterized in that The outer wall of the valve rod (3) is provided with a limiting piece (32), the limiting piece (32) is in contact with the worm gear (53) to form the axial limiting of the valve rod (3) after closing the diaphragm (4).

7. The diaphragm valve according to claim 1 or 2, characterized in that The position feedback mechanism (6) comprises a shell (61), a striker (62), a contact switch (63) and a signal feedback element (64), one end of the striker (62) is connected with the valve rod (3), the other end of the striker (62) extends into the shell (61) and is provided with two spaced apart striker blocks (65) at a predetermined distance, the contact switch (63) and the signal feedback element (64) are respectively provided with two and are fixed in the upper and lower ends of the shell (61), when the striker (62) ascends and descends along with the valve rod (3), the striker blocks (65) arranged apart on the striker (62) can respectively touch the contact switches (63) in the upper and lower ends of the shell (61), and the corresponding signal feedback elements (64) can send the position signal in real time.

8. The diaphragm valve according to claim 7, characterized in that The end of the shell (61) in contact with the base (54) is provided with a protruding upper positioning ring (611) and is inserted into the base (54), and the bottom of the base (54) is provided with a coaxial lower positioning ring (541), the worm wheel (53) is respectively sleeved with a needle bearing (57) at both ends, and the two needle bearings (57) are respectively in interference fit with the inner walls of the upper positioning ring (611) and the lower positioning ring (541).

9. The diaphragm valve according to claim 1, characterized in that The diaphragm (4) comprises a valve core seat (41) and an elastic sheet (42), the elastic sheet (42) is arranged between the valve body (1) and the valve cover (2) around, so that the valve body (1) and the valve cover (2) are sealingly connected, and a floating nut is arranged between the valve core seat (41) and the elastic sheet (42) to form a detachable connection and fixation.

10. The diaphragm valve according to claim 7, characterized in that A transparent cover (66) is sleeved on the shell (61), and the position signal emitted by the signal feedback element (64) is an optical signal.

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