Worm gear case butterfly valve with lock

Abstract

The utility model discloses a worm gear case butterfly valve with a lock, which comprises a valve body, a valve seat, a valve plate, a connecting support, an upper valve rod, a worm gear case and a hand wheel, and is mainly characterized in that the outer surface of the worm gear case is fixedly provided with the lock plate with a fixing hole, a transmission shaft is coaxially and fixedly provided with a lock disc with a plurality of lock holes, and the lock holes are arranged at intervals along the circumferential direction. The lock disc drives the lock holes to rotate around the axis, so that the fixing holes are sequentially aligned with the different lock holes. Therefore, a mechanical interference locking state can be formed only by aligning the fixing hole with any lock hole and simultaneously penetrating through the fixing hole and the lock, so that the rotation of the lock disc is limited, the continuous rotation of the transmission shaft is further limited, and the whole butterfly valve cannot be operated; obviously, due to the fact that the structure with the lock is directly exposed on the outer surface of the worm gear case and the transmission shaft, and the position is obvious, the structure with the lock can be directly exposed when an installation worker encounters a narrow installation space, operation such as locking or unlocking of an operator is facilitated, and the butterfly valve is better prevented from being closed or opened by mistake.

Description

Technical Field

[0001] This utility model relates to a butterfly valve, specifically a worm gear box-type butterfly valve with locking mechanism. Background Technology

[0002] Butterfly valves are flow regulation and opening / closing control components for media pipelines, widely used in various fields such as industry, agriculture, petrochemicals, and even people's work and life. They are particularly suitable for air conditioning systems and industrial water treatment equipment. The existing butterfly valve structure mainly consists of a valve body, a valve seat inside the valve body, a valve plate inside the valve seat, a connecting bracket at the top of the valve body, an upper valve stem inside the connecting bracket, and a worm gear box at the top of the connecting bracket. This worm gear box is equipped with a drive shaft and a handwheel. The handwheel drives the drive shaft to rotate, inputting power into the worm gear box, which then drives the upper valve stem to rotate the valve plate to open and close. Due to the needs of industrial pipeline design and the structural layout requirements of building water supply, some applications require butterfly valves to prevent accidental closing or opening. Therefore, a locking butterfly valve must be designed to meet these needs. However, existing butterfly valves... The valve's locking structure is mainly designed inside the worm gear box. In actual use, this not only affects the layout of the transmission structure inside the worm gear box, making the structure of the worm gear box more complex, but also makes the unlocking position relatively hidden. It is mostly a small hole or short shaft on the back of the worm gear box. Some installers are not familiar with the structure of this butterfly valve, and when they encounter narrow installation spaces, they often hide the unlocking position on the back of the worm gear box in a corner, making it impossible for operators to lock or unlock. Or, when operators are not familiar with the structure of the butterfly valve, they can never find the locking or unlocking position. In fact, these locking structures are only to prevent accidental closing or opening, and there is no need to design them to be so hidden and complicated. If the locking position is directly shown to the operators, it will improve the ease of use. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a worm gear box lockable butterfly valve with a clear locking position and more convenient use.

[0004] The technical problem of this utility model is solved by the following technical solution:

[0005] A worm gear box with locking butterfly valve includes a valve body, a valve seat inside the valve body, a valve plate inside the valve seat, a connecting bracket at the top of the valve body, an upper valve stem inside the connecting bracket, and a worm gear box at the top of the connecting bracket. The worm gear box is equipped with a drive shaft and a handwheel. The handwheel drives the drive shaft to rotate, inputting power into the worm gear box. The worm gear box then drives the upper valve stem to rotate the valve plate to open and close. A locking plate is fixedly installed on the outer surface of the worm gear box, and the locking plate has a fixing hole. A locking disc is coaxially fixedly installed on the drive shaft. The locking disc has multiple locking holes spaced circumferentially. When the drive shaft rotates, the locking disc drives the multiple locking holes to rotate around the axis, so that the fixing holes are sequentially aligned with different locking holes. When the fixing hole is aligned with any locking hole, a lock simultaneously penetrates the fixing hole and the corresponding locking hole to form a mechanical interference locking state, thereby restricting the rotation of the locking disc and thus restricting the continued rotation of the drive shaft.

[0006] The locking plate and the locking disc are provided with a gap to prevent axial contact. The width of the gap is greater than the maximum allowable movement of the locking disc in the axial direction of the drive shaft.

[0007] The lock disc is a circular structure fixed coaxially with the drive shaft, and the multiple lock holes are arranged circumferentially with the axis of the lock disc as the center.

[0008] The lock disc and the drive shaft are coaxially fixed by a keyway fixing structure, a spline connection structure, or a pin fixing structure.

[0009] The valve plate has a lower valve stem at the bottom to form a rotational support.

[0010] The upper end of the upper valve stem has an arc groove on its outer circumference for mounting the worm gear box, and the lower end of the upper valve stem is inserted into the non-circular hole on the top of the valve plate via a non-circular cross-section shaft adapter to form a transmission connection.

[0011] The lower valve stem is inserted through the bottom hole at the bottom of the valve body, and the upper end of the lower valve stem is inserted into the non-circular hole at the bottom of the valve plate via a non-circular cross-section shaft adapter to form a transmission connection.

[0012] The outer circumferential surface of the valve seat and the inner circumferential surface of the valve body are respectively provided with annular grooves and annular ribs to form an embedded and fixed part.

[0013] The aforementioned annular groove and annular rib are I-shaped annular grooves and I-shaped annular ribs, or T-shaped annular grooves and T-shaped annular ribs, which interlock to form an axial fixation.

[0014] The bottom hole is provided with a screw plug that seals the lower valve stem inside.

[0015] Compared with the prior art, this utility model mainly features a locking plate fixedly installed on the outer surface of the worm gear box. The locking plate has fixing holes, and a locking disc is coaxially fixedly installed on the drive shaft. The locking disc has multiple locking holes spaced circumferentially. When the drive shaft rotates, the locking disc drives the multiple locking holes to rotate around the axis, causing the fixing holes to align with different locking holes in sequence. In this way, by simply aligning the fixing hole with any locking hole and then having the lock pass through both the fixing hole and the corresponding locking hole simultaneously, a mechanical interference locking state is formed, thereby restricting the rotation of the locking disc and thus restricting the continued rotation of the drive shaft, making the entire butterfly valve inoperable. Obviously, since the locking structure is directly exposed on the outer surface of the worm gear box and the drive shaft, the locking position is very obvious, allowing installers to directly expose the locking structure when encountering narrow installation spaces. This facilitates locking or unlocking operations for operators and better prevents the butterfly valve from being accidentally closed or opened. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0017] Figure 2 for Figure 1 Enlarged view of point A.

[0018] Figure 3 for Figure 1 The left view.

[0019] Figure 4 This is one perspective view of the locking structure between the worm gear box and the drive shaft.

[0020] Figure 5 Another perspective view of the locking structure between the worm gear box and the drive shaft.

[0021] Figure 6 This is a cross-sectional view of the upper valve stem.

[0022] Figure 7 This is a drawing of the upper valve stem.

[0023] Figure 8 This is a sectional view of the valve seat.

[0024] Figure 9 This is a cross-sectional view of the valve plate. Detailed Implementation

[0025] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] like Figures 1-9As shown, 1. Valve body, 101. Ring rib, 2. Valve seat, 201. Ring groove, 3. Valve plate, 31. Non-circular hole, 4. Connecting bracket, 5. Upper valve stem, 51. Semi-circular arc groove, 52. Non-circular section shaft, 6. Worm gear box, 61. Drive shaft, 62. Pin, 63. Switch indicator, 64. Keyway fixing structure, 7. Handwheel, 8. Locking plate, 81. Fixing hole, 9. Locking disc, 91. Locking hole, 10. Lock, 11. Lower valve stem, 12. Plug, 13. Washer, 14. O-ring.

[0027] A worm gear box with a locking butterfly valve, such as Figure 1 As shown, it can be used as a flow regulation and opening / closing control component for media pipelines. This embodiment mainly uses an anti-condensation butterfly valve as an example for detailed description. Its structure includes a valve body 1, a valve seat 2 inside the valve body, a valve plate 3 inside the valve seat, a connecting bracket 4 on the top of the valve body, an upper valve stem 5 inside the connecting bracket, and a worm gear box 6 on the top of the connecting bracket. The worm gear box is equipped with a drive shaft 61 and a handwheel 7. The handwheel drives the drive shaft 61 to rotate and input power into the worm gear box 6. The worm gear box then drives the upper valve stem 5 to rotate the valve plate 3 to open and close.

[0028] The valve body 1 is made of ultra-light aluminum alloy, and its weight is only one-third of that of a traditional butterfly valve, which can effectively prevent corrosion.

[0029] The outer circumferential surface of the valve seat 2 and the inner circumferential surface of the valve body 1 are respectively fixed by an annular groove 201 and an annular rib 101. In this embodiment, for example... Figure 2 As shown, the annular groove 201 and the annular rib 101 are made of I-shaped annular groove and I-shaped annular rib, but other shapes can also be used, such as T-shaped annular groove and T-shaped annular rib. The annular groove 201 and the annular rib 101 are interlocked to form an axial fixation, thereby preventing the valve plate 3 from accidentally driving the valve seat to detach from the valve body 1 when it rotates in the valve seat 2.

[0030] The valve seat 2 is integrally vulcanized with EPDM rubber and adopts a multi-layer progressive contact design, which allows the stainless steel ball-shaped valve plate 3 to gradually contact the valve seat 2 during the closing process, thereby ensuring good sealing performance while reducing unnecessary torque.

[0031] The connecting bracket 4 is made of stainless steel. It is fixed to the top of the valve body 1 by multiple bolts and a sealing component is provided between it and the top of the valve body to form a connection seal.

[0032] The upper valve stem 5 is vertically rotatably mounted in the shaft hole of the connecting bracket 4, and various sealing components such as O-rings 14 and sealing gaskets are provided between the outer circumferential surface of the upper valve stem 5 and the inner circumferential surface of the shaft hole to form a rotational seal; the upper valve stem 5 as... Figure 6 , Figure 7As shown, the upper outer circumference surface is provided with a semi-circular groove 51 to realize the installation with the worm gear box 6, and the lower end is adapted to be inserted into the non-circular hole 31 on the top of the valve plate 3 via a non-circular section shaft 52 to form a transmission connection.

[0033] Therefore, a lower valve stem 11 is also required at the bottom of the valve plate 3 to form a bidirectional rotational support, thereby improving the stability of the valve plate 3 in rotational opening and closing. The lower valve stem 11 is usually vertically inserted into the bottom hole of the valve body 1 and sealed inside by a screw plug 12 threaded into the bottom hole and a washer 13. At this time, the upper end of the lower valve stem 11 is also inserted into the non-circular hole at the bottom of the valve plate through a non-circular cross-section shaft adapter to form a transmission connection. An O-ring 14 is also provided between the outer circumferential surface of the lower valve stem 11 and the inner circumferential surface of the bottom hole to form a rotational seal.

[0034] In this example, the non-circular cross-section shaft 52 and non-circular hole 31 at the lower end of the upper valve stem and the top of the valve plate, as well as at the upper end of the lower valve stem and the bottom of the valve plate, can be connected by a double flat shaft with a double flat hole, or by a single flat shaft (i.e., a D-shaped shaft with a single flat hole, i.e., a D-shaped hole), or even by a polygonal shaft and polygonal hole with a matching connection. This matching connection does not require the use of traditional pin connections, so the structural design is simpler. Furthermore, the non-circular cross-section shaft 52 and non-circular hole 31 can use a transition fit to avoid relative rotation and better transmit torque.

[0035] The outer surface of the worm gear box 6, that is, as Figure 4 , Figure 5 A locking plate 8 is fixedly installed on the side of the worm gear box near the drive shaft 61. The locking plate is also made of lightweight aluminum alloy and has a fixing hole 81. Only one hole is needed, and the fixing method can be directly welded.

[0036] The top surface of the worm gear box 6 is provided with a switch indicator 63, which can be used to help operators intuitively understand the opening and closing operation of the butterfly valve.

[0037] The handwheel 7 is mounted on the transmission shaft 61 and fixed by the pin 62. Therefore, rotating the handwheel 7 will drive the transmission shaft 61 to rotate synchronously.

[0038] A locking disc 9 is coaxially fixedly mounted on the drive shaft 61, specifically by means of a... Figure 4 The keyway fixing structure 64 shown forms a coaxial fixation. Of course, a spline connection structure or a pin fixing structure can also form a coaxial fixation. The locking disc 9 is a disc structure with multiple locking holes 91 spaced around the circumference. That is, the multiple locking holes are spaced around the axis of the locking disc 9, and the distance between each two adjacent locking holes 91 is equal. In other words, the multiple locking holes 91 are evenly distributed in a circle with the axis of the locking disc 9 as the center.

[0039] In this way, when the drive shaft 61 is driven to rotate by the handwheel 7, the lock disc 9 will drive multiple lock holes 91 to rotate around the axis, and the fixing hole 81 can be aligned with different lock holes 91 in sequence.

[0040] When it is necessary to lock the butterfly valve, simply align the fixing hole 81 with any of the locking holes 91, and the additionally configured lock 10 simultaneously passes through the fixing hole 81 and the corresponding locking hole 91 to form a mechanical interference locking state, thereby restricting the rotation of the locking disc 9, which in turn restricts the continued rotation of the drive shaft 61, making the entire butterfly valve unable to be operated. This reduces the possibility of non-operating personnel controlling the butterfly valve, preventing the flow rate of the fluid passing through the butterfly valve from being arbitrarily changed, and ensuring that the equipment can operate normally.

[0041] In this embodiment, the lock 10 is a simple and practical padlock, but other locks with locking functions can also be selected.

[0042] In addition, a gap must be reserved between the locking plate 8 and the locking disc 9 to prevent axial contact. The width of this gap must be greater than the maximum axial movement allowance of the locking disc 9 on the drive shaft 61. In other words, the width of the gap needs to be determined based on the axial tolerance of the drive shaft 61 and the assembly tolerance of the locking disc 9. After the locking disc is assembled on the drive shaft 61, its actual range of motion needs to be left with a gap to avoid the locking disc 9 directly contacting the locking plate 8 and to prevent rotational interference between the two under normal working conditions.

[0043] Obviously, this utility model has a lockable structure that is directly exposed on the outer surface of the worm gear box 6 and the transmission shaft 61, meaning the lock position is very obvious. This allows the lockable structure to be directly exposed when the installation worker encounters a narrow installation space, which facilitates the locking or unlocking operations of the operator and can also better prevent the butterfly valve from being accidentally closed or opened.

[0044] The basic principles and main features of this utility model have been described above. Those skilled in the art should understand that this utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the utility model as claimed. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A worm gear box with locking butterfly valve, comprising a valve body (1), a valve seat (2) inside the valve body, a valve plate (3) inside the valve seat, a connecting bracket (4) at the top of the valve body, an upper valve rod (5) inside the connecting bracket, and a worm gear box (6) at the top of the connecting bracket, wherein the worm gear box is provided with a drive shaft (61) and a handwheel (7), and the handwheel drives the drive shaft (61) to rotate to input power into the worm gear box (6), and the worm gear box drives the upper valve rod (5) to rotate the valve plate (3) to open and close, characterized in that: A locking plate (8) is fixedly installed on the outer surface of the worm gear box (6), and the locking plate is provided with fixing holes (81). A locking disc (9) is coaxially fixedly installed on the drive shaft (61), and the locking disc has multiple locking holes (91) spaced apart along the circumference. When the drive shaft (61) rotates, the lock disc (9) drives multiple lock holes (91) to rotate around the axis, so that the fixing hole (81) is aligned with different lock holes (91) in sequence; When the fixing hole (81) is aligned with any of the lock holes (91), the lock (10) passes through the fixing hole (81) and the corresponding lock hole (91) at the same time to form a mechanical interference locking state, so as to restrict the rotation of the lock disc (9) and thus restrict the continued rotation of the drive shaft (61).

2. A butterfly valve of the type defined in claim 1, characterised in that The locking plate (8) and the locking disc (9) are provided with a gap to prevent axial contact. The width of the gap is greater than the maximum allowable movement of the locking disc in the axial direction of the drive shaft.

3. A butterfly valve of the type defined above, in which The lock disc (9) is a disc structure that is coaxially fixed with the transmission shaft (61), and the multiple lock holes (91) are arranged circumferentially with the axis of the lock disc (9) as the center.

4. A butterfly valve of the type defined in claim 3, characterised in that The lock disc (9) and the drive shaft (61) are coaxially fixed by a keyway fixing structure (64), a spline connection structure, or a pin fixing structure.

5. A butterfly valve of the type defined above, in which The valve plate (3) is provided with a lower valve rod (11) at the bottom to form a rotational support.

6. A butterfly valve of the type defined above, in which The upper valve stem (5) has a semi-circular groove (51) for mounting the worm gear box (6) on its upper outer circumference. The lower end of the upper valve stem (5) is adapted to be inserted into the non-circular hole (31) on the top of the valve plate (3) via a non-circular section shaft (52) to form a transmission connection.

7. A butterfly valve of the type defined in claim 5, characterised in that The lower valve stem (11) is inserted into the bottom hole of the valve body (1), and the upper end of the lower valve stem (11) is inserted into the non-circular hole at the bottom of the valve plate through a non-circular cross-section shaft adapter to form a transmission connection.

8. The butterfly valve of claim 1, wherein The outer circumferential surface of the valve seat (2) and the inner circumferential surface of the valve body (1) are respectively provided with an annular groove (201) and an annular rib (101) to form an embedded and fixed part.

9. A butterfly valve of the type defined in claim 8, characterised in that The annular groove (201) and annular rib (101) are I-shaped annular grooves and I-shaped annular ribs, or T-shaped annular grooves and T-shaped annular ribs. The annular groove (201) and annular rib (101) are interlocked to form an axial fixation.

10. A butterfly valve of the type defined by claim 7, characterised in that The bottom hole is provided with a screw plug (12) that seals the lower valve stem (11) inside.

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