Manual liquid medicine valve

Abstract

The present invention discloses a manual liquid medicine valve, comprising: a mounting base plate, a valve seat, a valve seat cover, an upper cover, a screw nut, a screw, a hand wheel and a torque expander; a diaphragm is arranged on the sealing surface of the valve seat, the valve seat is mounted on the mounting base plate, the valve seat cover is mounted on the valve seat, the upper cover is mounted on the valve seat cover, the screw is arranged in the screw nut, the torque expander is mounted on the screw nut, the hand wheel is connected to the torque expander, and the hand wheel is connected to the screw sleeve; when the hand wheel is rotated, the screw nut is driven to rotate through the torque expander, the screw moves downward, and the diaphragm is driven to press downward, and when the sealing surface of the diaphragm and the valve seat is completely closed, and the torque reaches the maximum torque threshold of the torque expander, the torque expander expands. The present invention overcomes the problem that the sealing surface of the PTFE diaphragm is excessively compressed due to the excessive closing torque of the manual liquid medicine valve, thereby causing the sealing surface of the diaphragm to be damaged, unable to seal and leak, or the diaphragm size changes after excessive compression, the stroke increases, and the diaphragm is pulled and ruptured.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid medicine valves, and in particular to a manual liquid medicine valve. Background Art

[0002] The structure of the liquid medicine valve is different from that of general valves. It is a new type of valve, a special form of shut-off valve, which is a fusion of the structures of diaphragm valves and plunger valves. Its opening and closing is a diaphragm made of high-temperature resistant, corrosion-resistant, and non-precipitated PTFE material, which separates the inner cavity of the valve body from the inner cavity of the valve cover and the drive components. It is now widely used in semiconductors, medical care, new energy and other fields, including gas, ultrapure water and pure acid and alkali chemicals. The main technical difficulty of existing manual liquid medicine valves lies in the life of the diaphragm of the product. Factors include the matching accuracy of each workpiece, the reasonable maturity of the long-term verification of the mechanism design, the structural design of the diaphragm itself, material properties and molding accuracy. Existing liquid medicine valves have the following disadvantages:

[0003] Existing manual liquid medicine valves, including all current straight-stroke valves, are opened and closed by manual twisting, and the switch control is achieved by a mature screw nut and screw rod structure. However, this structure cannot guarantee the locking force in the closed state, that is, if the lock is too loose, the valve will not close tightly, resulting in internal leakage; if the lock is too tight, the sealing surface of the PTFE diaphragm will be over-compressed, and frequent operations will cause damage to the diaphragm sealing surface and increase the diaphragm stroke, thereby reducing the life of the diaphragm and making it easy for the diaphragm to fail to seal or rupture. Summary of the invention

[0004] The main purpose of the present invention is to provide a manual liquid medicine valve, which aims to overcome the problem that the closing torque of the existing manual liquid medicine valve is too large, causing the sealing surface of the PTFE diaphragm to be excessively compressed, thereby causing the diaphragm sealing surface to be damaged and unable to seal and leak; or the diaphragm size changes after excessive compression, the stroke increases, and the diaphragm is pulled and ruptured.

[0005] To achieve the above object, the present invention provides a manual liquid medicine valve, comprising: a mounting base plate, a valve seat, a valve seat cover, an upper cover, a screw nut, a screw, a hand wheel and a torque expander;

[0006] Wherein, a diaphragm is arranged on the sealing surface of the valve seat, the valve seat is mounted on the mounting base plate, the valve seat cover is mounted on the valve seat, the upper cover is mounted on the valve seat cover, the screw rod is arranged in the screw rod nut, the torque expander is mounted on the screw rod nut, the hand wheel is connected to the torque expander, and the hand wheel is connected to the screw rod slipcover;

[0007] When the hand wheel is rotated, the screw nut is driven to rotate through the torque expander, and the screw moves downward, driving the diaphragm to be pressed downward. When the sealing surface of the diaphragm and the valve seat is completely closed and the torque reaches the maximum torque threshold of the torque expander, the torque expander expands.

[0008] A further technical solution of the present invention is that the diaphragm is a PTFE membrane.

[0009] A further technical solution of the present invention is that the maximum torque threshold is 5N.

[0010] A further technical solution of the present invention is that the screw nut is provided with an external hexagonal structure installation position, the torque expander is an internal hexagonal structure, and the torque expander is engaged with the external hexagonal structure installation position.

[0011] A further technical solution of the present invention is that the torque expander comprises an expander body and an expander outer cover detachably connected to the expander body.

[0012] A further technical solution of the present invention is that a plurality of expander outer cover slots are arranged on the expander body, and fixing claws corresponding to the plurality of expander outer cover slots are arranged on the expander outer cover.

[0013] A further technical solution of the present invention is that hooks are respectively arranged on both sides of the hand wheel, and hook grooves matching with the hooks are respectively arranged in the expander body and the expander outer cover, and the hooks are clamped in the hook grooves.

[0014] A further technical solution of the present invention is that the upper cover and the valve seat cover are detachably connected by bolts.

[0015] The beneficial effects of the manual liquid medicine valve of the present invention are as follows: the present invention, through the above technical scheme, comprises: a mounting base plate, a valve seat, a valve seat cover, an upper cover, a screw nut, a screw, a handwheel and a torque expander; wherein, a diaphragm is arranged on the sealing surface of the valve seat, the valve seat is mounted on the mounting base plate, the valve seat cover is mounted on the valve seat, the upper cover is mounted on the valve seat cover, the screw is arranged in the screw nut, the torque expander is mounted on the screw nut, the handwheel is connected to the torque expander, and the handwheel is connected to the screw sleeve; when the handwheel is rotated, the torque expander drives the screw The screw nut rotates, the screw moves downward, and drives the diaphragm to be pressed downward. When the sealing surfaces of the diaphragm and the valve seat are completely closed and the torque reaches the maximum torque threshold of the torque expander, the torque expander expands, realizing overload protection of the locking torque, and can effectively ensure the sealing surface of the diaphragm, avoiding damage due to uncertainty caused by large or small operating force of personnel, and overcoming the problem that the sealing surface of the PTFE diaphragm is over-compressed due to the excessive closing torque of the existing manual liquid medicine valve, thereby causing the diaphragm sealing surface to be damaged, unable to seal and leak, or the diaphragm size changes after excessive compression, the stroke increases, and the diaphragm is pulled and ruptured. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the exploded structure of a preferred embodiment of the manual liquid medicine valve of the present invention;

[0017] Figure 2 It is a schematic diagram of the assembly of the hand wheel, torque expander and screw nut;

[0018] Figure 3 It is a schematic diagram of the overall structure of a preferred embodiment of the manual liquid medicine valve of the present invention.

[0019] Description of Figure Numbers:

[0020] Mounting base plate 1; valve seat 2; valve seat cover 3; upper cover 4; screw nut 5; screw 6; handwheel 7; torque expander 8; diaphragm 9; external hexagonal structure mounting position 10; internal hexagonal structure 11; expander body 12; expander outer cover 13; expander outer cover slot 14; fixing claw 15; hook 16; hook slot 17; bolt 18.

[0021] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0023] The present invention proposes a manual liquid medicine valve, which relates to a torque protection mechanism for manually twisting and closing a high-temperature, corrosion-resistant manual liquid medicine valve with precise micro-flow control, so as to realize the protection of the diaphragm against overload. Specifically, it is a new polymer material valve with a diaphragm anti-locking mechanism, which can realize the control application of highly corrosive, high-temperature, and high-purity media in wet processes of new industries such as semiconductors, integrated circuits, and solar energy.

[0024] Specifically, Figures 1 to 3 A preferred embodiment of the manual liquid medicine valve of the present invention includes a mounting base plate 1, a valve seat 2, a valve seat cover 3, an upper cover 4, a screw nut 5, a screw 6, a hand wheel 7 and a torque expander 8.

[0025] Among them, a diaphragm 9 is provided on the sealing surface of the valve seat 2, the valve seat 2 is installed on the mounting base plate 1, the valve seat cover 3 is installed on the valve seat 2, the upper cover 4 is installed on the valve seat cover 3, the screw rod 6 is arranged in the screw rod nut 5, the torque expander 8 is installed on the screw rod nut 5, the handwheel 7 is connected to the torque expander 8, and the handwheel 7 is connected to the screw rod 6 with a sleeve.

[0026] The diaphragm 9 is, for example, a PTFE membrane.

[0027] When the hand wheel 7 is rotated, the screw nut 5 is driven to rotate through the torque expander 8, the screw 6 moves downward, and the diaphragm 9 is pressed downward. When the sealing surface of the diaphragm 9 and the valve seat 2 is completely closed, and the torque reaches the maximum torque threshold of the torque expander 8, the torque expander expands. The maximum torque threshold can be set according to actual conditions, for example, 5N for a 1 / 2" diameter.

[0028] In this embodiment, the handwheel 7 and the screw rod 6 improve the fixed installation in the prior art into a slip-on installation, and add a torque expander 8 of a mechanical structure. When the handwheel 7 is rotated to start closing the valve, the handwheel 7 drives the screw rod 6 to rotate and presses down the diaphragm. When the sealing surfaces of the diaphragm and the valve seat 2 are completely closed and the torque exceeds the maximum torque of the expander, the expander expands, and the handwheel 7 cannot drive the screw rod 6 to continue to rotate downward, thereby achieving overload protection of the locking torque, effectively ensuring the sealing surface of the diaphragm 9, and avoiding damage due to uncertainty caused by large or small operating force of personnel, and overcoming the problem that the closing torque of the existing manual liquid medicine valve is too large, causing the sealing surface of the PTFE diaphragm 9 to be over-compressed, thereby causing the sealing surface of the diaphragm 9 to be damaged, unable to seal and leak, or the diaphragm 9 changes in size after excessive compression, and the stroke increases, causing the diaphragm 9 to be pulled and ruptured.

[0029] Furthermore, in the present embodiment, the screw nut 5 is provided with an external hexagonal structure installation position 10 , the torque expander 8 is an internal hexagonal structure 11 , and the torque expander 8 is engaged with the external hexagonal structure installation position 10 .

[0030] In order to ensure the effective operation of the torque expander 8, the connection position between the screw nut 5 and the torque expander 8 is designed as a hexagonal structure. When the torque is lower than the set torque, the torque expander 8 and the screw nut 5 are tightly clamped. When the closing torque is higher than the set value, the torque expander 8 expands outward and the clamping structure is loosened.

[0031] In this embodiment, the torque expander 8 includes an expander body 12 and an expander outer cover 13 detachably connected to the expander body 12 .

[0032] The expander body 12 is provided with a plurality of expander cover slots 14 , and the expander cover 13 is provided with fixing claws 15 corresponding to the plurality of expander cover slots 14 .

[0033] Hooks 16 are respectively provided on both sides of the hand wheel 7 , and hook grooves 17 matched with the hooks 16 are respectively provided in the expander body 12 and the expander outer cover 13 , and the hooks 16 are clamped in the hook grooves 17 .

[0034] During assembly, the hooks 16 on both sides of the handwheel 7 are docked with the screw nut 5, and the expander body 12 is first pushed in along the hooks 16 on one side of the handwheel 7 until the inner hexagonal structure 11 of the expander body 12 and the outer hexagonal structure mounting position 10 are engaged, and then the expander outer cover 13 is pushed in along the hooks 16 on the other side of the handwheel 7 until the fixing claws 15 and the expander outer cover slots 14 are engaged.

[0035] As an implementation manner, in this embodiment, bolts 18 are used to detachably connect the upper cover 4 and the valve seat cover 3 .

[0036] The structure and working principle of the manual liquid medicine valve of the present invention are further described in detail below.

[0037] When the hand wheel 7 is rotated, the screw nut 5 is driven to rotate through the engagement structure of the torque expander 8 and the screw nut 5, so that the screw 6 moves downward, driving the diaphragm 9 to be pressed downward. When the sealing surface of the diaphragm 9 and the valve seat 2 is completely closed, the torque is increased by continuing to screw. When the torque reaches the predetermined expansion force value of the expander body 12, the expander body 12 expands outward, and the expander outer cover 13 slides outward accordingly until the size of the expander body 12 and the expander outer cover 13 opened is larger than the outer hexagonal structure mounting position 10. size, at this time, when the hand wheel 7 is rotated, the screw nut 5 cannot rotate, and only the expander body 12 and the expander outer cover 13 and the hand wheel 7 rotate, thereby realizing overload protection of the locking torque, effectively ensuring the sealing surface of the diaphragm 9, and avoiding damage due to uncertainty of large or small operating force of personnel, and overcoming the problem that the closing torque of the existing manual liquid medicine valve is too large, causing the sealing surface of the PTFE diaphragm 9 to be over-compressed, thereby causing the sealing surface of the diaphragm 9 to be damaged, unable to seal and leak, or the size of the diaphragm 9 changes after excessive compression, the stroke increases, and the diaphragm 9 is pulled and ruptured.

[0038] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A manual liquid medicine valve, characterized in that: include: Install the base plate, valve seat, valve seat cover, upper cover, screw nut, screw, handwheel and torque expander; Wherein, a diaphragm is arranged on the sealing surface of the valve seat, the valve seat is mounted on the mounting base plate, the valve seat cover is mounted on the valve seat, the upper cover is mounted on the valve seat cover, the screw rod is arranged in the screw rod nut, the torque expander is mounted on the screw rod nut, the hand wheel is connected to the torque expander, and the hand wheel is connected to the screw rod slipcover; When the hand wheel is rotated, the screw nut is driven to rotate through the torque expander, and the screw moves downward, driving the diaphragm to be pressed downward. When the sealing surface of the diaphragm and the valve seat is completely closed and the torque reaches the maximum torque threshold of the torque expander, the torque expander expands; The screw nut is provided with an external hexagonal structure installation position, the torque expander is an internal hexagonal structure, and the torque expander is engaged with the external hexagonal structure installation position; The torque expander comprises an expander body and an expander outer cover detachably connected to the expander body; The expander body is provided with a plurality of expander outer cover slots, and the expander outer cover is provided with fixing claws corresponding to the plurality of expander outer cover slots; Hooks are respectively arranged on both sides of the hand wheel, and hook grooves matching with the hooks are respectively arranged in the expander body and the expander outer cover, and the hooks are clamped in the hook grooves.

2. The manual liquid medicine valve according to claim 1, characterized in that: The diaphragm is a PTFE membrane.

3. The manual liquid medicine valve according to claim 1, characterized in that: The maximum torque threshold is 5N.

4. The manual liquid medicine valve according to claim 1, characterized in that: The upper cover and the valve seat cover are detachably connected via bolts.

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