Manual gas on-off device

Abstract

The manual gas on-off device is applied to the technical field of diaphragm valves and is characterized in that a transmission assembly is pushed to descend by rotating a shifting piece, and the transmission assembly descends to push a diaphragm to block a communication space and close communication of a first channel and a second channel; and then the shifting piece is rotated, the transmission assembly is not stressed, and then the diaphragm opens the communication between the first channel and the second channel by utilizing the self-recovery shape. According to the invention, the pick is used as a gas on-off switch, a knob is not used for adjustment, the occupied space is reduced, especially the pick is arranged in a narrow space between two parts in the internal space of the semiconductor equipment, and the device is suitable for a compact equipment space.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of valves, in particular to a manual gas on-off device. BACKGROUND

[0002] In a semiconductor processing process, ultra-high purity (UHP) gas plays a vital role, and a gas on-off device is used to control the delivery and flow regulation of various ultra-high purity gases (such as nitrogen, hydrogen, helium, etc.). According to different power sources, the gas on-off device can be divided into two types of pneumatic and manual. At present, the manual control gas on-off device mostly adopts a knob adjustment. In terms of space occupation, in addition to the volume of the device itself, a suitable operation space is also required. Therefore, the use environment of the gas on-off device, that is, the internal space of the semiconductor equipment, has a relatively high requirement. When the equipment space is relatively compact, the application of the gas on-off device with knob operation will be relatively limited.

[0003] Therefore, a new technical scheme is needed. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the application provides a manual gas on-off device.

[0005] The application provides the following technical scheme:

[0006] According to the manual gas on-off device provided by the application, the bottom of the valve body is provided with a first channel and a second channel which are in communication with the outside; the edge of the diaphragm is limited between the valve cover and the bottom of the valve body; the diaphragm and the bottom of the valve body form a communication space for communicating the first channel and the second channel; the bottom of the transmission assembly abuts against the diaphragm, so that the transmission assembly is lowered to push the diaphragm to block the communication of the first channel and the second channel; the sleeve is located outside the transmission assembly, the sleeve is provided with a pin shaft, the pin shaft is rotationally connected with the dial piece, and the dial piece abuts against the top of the transmission assembly, so that the dial piece can drive the transmission assembly to be lowered.

[0007] Preferably, the transmission assembly comprises a mandrel and a top column; the valve cover is provided with an upper chamber and a lower chamber, the upper chamber is provided with an upward opening, the sleeve is installed in the upper chamber, and the mandrel penetrates through the sleeve and is lifted and lowered; the lower chamber is provided with a downward opening, the top column is lifted and lowered in the lower chamber, the bottom of the upper chamber is formed with a perforation which communicates with the lower chamber, the bottom of the mandrel abuts against the top of the top column through the perforation, the bottom of the top column abuts against the diaphragm, and the dial piece abuts against the top of the mandrel.

[0008] Preferably, the manual gas on-off device further comprises a spring; a stop ring is fixed outside the mandrel, the spring is sleeved on the mandrel below the stop ring, the top of the spring abuts against the stop ring, the bottom of the spring abuts against the bottom of the upper chamber, the bottom of the sleeve is upwardly provided with a containing cavity for containing the spring and the stop ring, and the top of the containing cavity is used for limiting the stop ring so that the spring is in an elastic compression state.

[0009] Preferably, the bottom of the outer sidewall of the sleeve is circumferentially provided with a crimping ring; the manual gas on-off device further comprises an outer thread sleeve, the outer thread sleeve is sleeved on the outer sidewall of the sleeve and abuts against the crimping ring, and the outer thread sleeve is threadedly connected with the internal threads of the upper chamber of the valve cover, so as to change the initial compression amount of the spring by adjusting the screwing depth of the threads between the outer thread sleeve and the valve cover.

[0010] Preferably, the gas on-off device further comprises a fastening nut, the fastening nut is threadedly connected with the external threads of the outer thread sleeve, and the fastening nut abuts against the top of the valve cover to lock the outer thread sleeve.

[0011] Preferably, the pin shaft is an elastic cylindrical pin, the top of the sleeve is downwardly provided with a radial slot along the rotation plane of the switch plate, the switch plate has a pin hole, and the switch plate passes through the radial slot to make the pin hole rotationally connected with the elastic cylindrical pin, so as to switch the switch plate between the horizontal state and the vertical state.

[0012] Preferably, the distance from the center of the pin hole to the side of the mandrel abutting against the switch plate in the horizontal state is greater than the distance from the center of the pin hole to the side of the mandrel abutting against the switch plate in the vertical state, so as to push the mandrel to descend in the process of switching the switch plate from the vertical state to the horizontal state.

[0013] Preferably, the valve cover comprises a cover body and an abutting ring circumferentially provided on the bottom of the outer sidewall of the cover body, and the bottom of the abutting ring presses the diaphragm.

[0014] The manual gas on-off device further comprises a valve cover nut, the valve cover nut is sleeved on the cover body and abuts against the top of the abutting ring, and the inner sidewall of the valve body is threadedly connected with the external threads of the valve cover nut.

[0015] Preferably, the valve cover nut is provided with a receiving ring, and the receiving ring is circumferentially arranged around the valve cover nut.

[0016] The manual gas on-off device further comprises a crimping nut and a lock ring, the lock ring comprises a fixed ring piece and a ring hole piece.

[0017] The fixed ring piece is sleeved outside the valve cover and abuts on the receiving ring, the compression nut is threadedly connected with the outer thread of the valve cover, and the fixed ring piece is clamped between the compression nut and the receiving ring.

[0018] Preferably, the knob extends in a direction away from the rotation center of the knob, facilitating the rotation of the knob; the lug hole piece and the knob in the horizontal state of the knob are located on the same side of the sleeve, the lug hole piece is provided with a lug hole, the lug hole is located above the knob in the horizontal state of the knob, and the lug hole is used for inserting a locking object, so that the locking object is stopped on the knob in the horizontal state of the knob.

[0019] Compared with the prior art, the at least one technical scheme adopted by the application can achieve the beneficial effects at least including:

[0020] The knob is rotated to push the transmission assembly to descend, the transmission assembly pushes the diaphragm to block the communication space, and the communication between the first channel and the second channel is closed; the knob is rotated again, the transmission assembly is not stressed, and then the diaphragm restores the shape by itself, and the communication between the first channel and the second channel is opened. The knob is used as a gas on-off switch, and a knob is not used for adjustment, so that the occupied space is reduced, especially when the knob is arranged in a narrow space between two components in an internal space of a semiconductor device, the application is suitable for a compact device space. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 is a schematic view of the knob in a horizontal state of the manual gas on-off device in the application;

[0023] Figure 2 is a structural schematic view of the knob and the lug hole piece in the application;

[0024] Figure 3 is a schematic view of the knob in a vertical state of the manual gas on-off device in the application.

[0025] Reference numerals in the attached diagram: 1. Valve body; 2. Diaphragm; 3. Valve seat; 4. Valve cover; 401. Cover body; 402. Abutment ring; 5. Valve cover nut; 6. Top post; 7. Sleeve; 8. External threaded sleeve; 9. Spindle; 10. Paddle; 101. Handle block; 11. Pin; 12. Locking ring; 1201. Fixing ring plate; 1202. Ring plate hole; 13. Crimping nut; 14. Spring; 15. Fastening nut; 16. Retaining ring; 17. Crimping ring; 18. Receiving ring. Detailed Implementation

[0026] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0027] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0029] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0030] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0031] Applicant found that the diaphragm valve is used for controlling the delivery and flow regulation of various ultra-high purity gases (such as nitrogen, hydrogen, helium, etc.) through in-depth research and improvement of the gas on-off device. According to the different power sources, the diaphragm valve can be divided into two types of pneumatic and manual. The manual control diaphragm valve currently uses a knob to adjust. In terms of space occupation, in addition to the volume of the valve itself, a suitable operation space is also required. Therefore, the use environment of the valve, i.e. the internal space of the semiconductor equipment, has a higher requirement. When the equipment space is relatively compact, the diaphragm valve with knob operation will be more limited in application. Therefore, a diaphragm valve that can be manually operated, compact in size and small in space occupation, i.e. a switching diaphragm valve, needs to be developed.

[0032] Based on this, the technical solutions provided by the embodiments of the present application are described below in combination with the drawings.

[0033] The embodiments of the present application provide a kind of manual gas on-off device, as shown in Figure 1 It includes valve body 1, valve cover 4, diaphragm 2, transmission assembly, sleeve 7 and paddle 10;The bottom of valve body 1 is provided with first channel and second channel communicated with the outside;The edge of diaphragm 2 is limited between valve cover 4 and the bottom of valve body 1;Diaphragm 2 and the bottom of valve body 1 form a communication space for communicating first channel and second channel;The bottom of transmission assembly abuts diaphragm 2, so that transmission assembly is lowered to push diaphragm 2 to block the communication space, and the communication of first channel and second channel is blocked;Sleeve 7 is located outside transmission assembly, sleeve 7 is installed with pin shaft 11, pin shaft 11 is rotationally connected with paddle 10, and paddle 10 abuts the top of transmission assembly to realize that paddle 10 can drive transmission assembly to descend. Figure 1 and Figure 3 The arrow in the figure indicates the direction of gas flow. The first channel is the inlet channel, and the second channel is the outlet channel. For example, the valve cover 4 can press the edge of the diaphragm 2 tightly against the bottom of the valve body 1. The diaphragm 2 is an elastic membrane.

[0034] In an embodiment, as shown in Figure 1 and Figure 2As shown, the transmission assembly comprises the mandrel 9 and the top post 6; the valve cover 4 is provided with an upper chamber and a lower chamber, the upper chamber is upwardly open, the sleeve 7 is installed on the upper chamber, and the mandrel 9 is inserted into the sleeve 7 and can be lifted; the lower chamber is downwardly open, the top post 6 is lifted in the lower chamber, the bottom of the upper chamber is provided with a through hole communicating with the lower chamber, the bottom of the mandrel 9 abuts against the top of the top post 6 through the through hole, the bottom of the top post 6 abuts against the diaphragm 2, and the tab 10 abuts against the top of the mandrel 9. The mandrel 9 is in clearance fit with the inner side wall of the sleeve 7, so that the mandrel 9 can freely move up and down in the sleeve 7. The valve cover 4 is an independent part, two cylindrical cavities are excavated at both ends of the valve cover 4, a thin wall is formed between the two cavities, and a small hole allowing only the mandrel 9 to pass through is opened on the thin wall, i.e. the through hole. The mandrel 9 is in clearance fit or transition fit with the through hole. The valve body 1 is provided with the valve seat 3 at the bottom of the first passage, the first passage is connected to the communication space through the valve seat 3, the top post 6 is lowered to push the diaphragm 2 to block the valve seat 3, so as to block the communication between the first passage and the second passage, and the valve body 1 is further provided with a circular annular groove communicating with the second passage, and the groove is arranged with the valve seat 3 as the center. The diaphragm 2 is separated from the valve seat 3 and relies on the elastic force of the diaphragm 2 itself to restore to the shape before being compressed. For example, the valve seat 3 can be located at the middle position of the bottom of the valve body 1, and the top of the valve seat 3 is a ring-shaped open plane. The bottom edge of the valve cover 4 is inclined upward toward the bottom edge of the lower chamber, so that the bottom of the valve cover 4 is flared, and the diaphragm 2 is a circular arc surface capable of being attached to the bottom of the valve cover 4. The elastic restoring force of the diaphragm 2 itself is greater than the weight of the part of the transmission assembly contacting the diaphragm 2, i.e. the weight of the top post 6.

[0035] As shown in Figure 1 and Figure 2 , the manual gas on-off device further comprises a spring 14; a check ring 16 is fixed outside the mandrel 9, the spring 14 is sleeved on the mandrel 9 below the check ring 16, the top of the spring 14 abuts against the check ring 16, and the bottom of the spring 14 abuts against the bottom of the upper chamber; the bottom of the sleeve 7 is upwardly provided with an accommodating cavity accommodating the spring 14 and the check ring 16, and the check ring 16 abuts against the top of the accommodating cavity, so that the spring 14 is in an elastic compression state. For example, the check ring 16 is an open check ring 16, a ring groove is opened on the outside of the mandrel 9, and the open check ring 16 is installed in the ring groove. For example, the accommodating cavity is a cylindrical cavity. The part of the mandrel 9 above the check ring 16 is longer than the part of the mandrel 9 below the check ring 16.

[0036] As shown in Figure 1 and Figure 2 , the bottom of the outer side wall of the sleeve 7 is circumferentially provided with a crimping ring 17; the manual gas on-off device further comprises an outer thread sleeve 8, the outer thread sleeve 8 is sleeved on the outer side wall of the sleeve 7 and abuts against the crimping ring 17, and the outer thread sleeve 8 is threadedly connected to the inner thread of the upper chamber of the valve cover 4, so as to change the initial compression amount of the spring 14 by adjusting the screwing depth between the outer thread sleeve 8 and the valve cover 4.

[0037] In one embodiment, as shown in Figure 1 and Figure 2 , the gas on-off device further comprises a fastening nut 15, which is threadedly connected to the outer thread of the outer sleeve 8, so that the fastening nut 15 abuts against the top of the valve cover 4 to lock the outer sleeve 8.

[0038] In one embodiment, as shown in Figure 1 and Figure 3 , the pin shaft 11 is an elastic cylindrical pin, and the top of the sleeve 7 is provided with a radial slot along the rotation plane of the paddle 10, the paddle 10 has a pin hole, and the paddle 10 passes through the radial slot to make the pin hole rotationally connected with the elastic cylindrical pin, so that the paddle 10 is switched between the horizontal state and the vertical state.

[0039] In one embodiment, as shown in Figure 1 and Figure 3 , the distance from the center of the pin hole to the edge of the spindle 9 abutting against the paddle 10 in the horizontal state is greater than the distance from the center of the pin hole to the edge of the spindle 9 abutting against the paddle 10 in the vertical state, so that the spindle 9 is pushed down in the process of the paddle 10 being switched from the vertical state to the horizontal state. That is, the difference between the two distance sizes is the distance of the downward movement of the spindle 9 in the process of the paddle 10 being switched from the vertical state to the horizontal state. When the paddle 10 is switched from the horizontal state to the vertical state, the pressure applied to the diaphragm 2 is released, the diaphragm 2 is no longer elastically deformed, and returns to the natural state before being pressed, so that the flow passage is through and the valve is opened. The edge of the spindle 9 abutting against the paddle 10 in the horizontal state is transitioned to the edge of the spindle 9 abutting against the paddle 10 in the vertical state through an arc edge fillet.

[0040] In one embodiment, as shown in Figure 1 and Figure 3 , the valve cover 4 comprises a cover body 401 and an abutting ring 402 around the bottom of the outer sidewall of the cover body 401, and the bottom of the abutting ring 402 presses the diaphragm 2; the manual gas on-off device further comprises a valve cover nut 5, which is sleeved on the cover body 401 and abuts against the top of the abutting ring 402, and the inner sidewall of the valve body 1 is threadedly connected with the outer thread of the valve cover nut 5.

[0041] In one embodiment, as shown in Figure 1 and Figure 3 , the valve cover nut 5 is provided with a receiving ring 18, which is circumferentially arranged around the valve cover nut 5; the manual gas on-off device further comprises a crimping nut 13 and a locking ring 12, the locking ring 12 comprises a fixed ring piece 1201 and a ring hole piece 1202; the fixed ring piece 1201 is sleeved on the valve cover 4 and abuts against the receiving ring 18, the crimping nut 13 is threadedly connected with the outer thread of the valve cover 4, and the fixed ring piece 1201 is clamped between the crimping nut 13 and the receiving ring 18.

[0042] In one embodiment, as shown in Figure 1 ,Figure 2 as well as Figure 3 As shown, a lever 101 extends from the lever 10 in a direction opposite to the rotation center of the lever 10 to facilitate rotation of the lever 10. An annular plate 1202 and the lever 101 in a horizontal position are located on the same side of the sleeve 7. The annular plate 1202 has an annular hole located above the lever 101 in a horizontal position. The annular hole is used to insert a locking device so that the locking device stops on the lever 101 in a horizontal position. The lever 101 is located above the side wall of the horizontal lever 10, so that the lever 10 and the lever 101 form a gate shape. When the manual gas switch is in the closed state, the lever 101 is lower than the annular hole, and an additional part, i.e., a stop, passes through the annular hole, acting as a safety device to prevent accidental activation or other reasons that could cause the manual gas switch to be abnormally opened.

[0043] In one embodiment, such as Figure 1 , Figure 2 as well as Figure 3 As shown, the first channel is the air inlet channel, and the second channel is the air outlet channel. The first channel and the annular plate 1202 are located on the same side of the sleeve 7. The annular plate 1202 can be used on the air inlet side of the manual gas switching device, that is, the locking ring 12 is positioned close to the air inlet end, and then it can be pressed and fixed by the crimp nut 13. In addition, the position of the annular plate 1202 is similar to that of the lever 10. When the lever 10 is turned to the horizontal position, it is in the same straight line as the gas flow direction and points to the air inlet side, with the annular hole located in the middle of the gate. For example, the first channel and the second channel can be opposite L-shaped, and the first channel and the second channel can connect from the bottom of the valve body 1 to the outer wall of the valve body 1. The gas in this gas switching device is, for example, an ultra-high purity gas used in semiconductor processing.

[0044] In one embodiment, such as Figure 1 and Figure 3As shown, the gas on-off device can be manually operated, and is compact in size and small in space occupation, for example, a manual switching diaphragm valve. The valve is controlled by a small dial 10 which can be rotated by 90 degrees in the vertical plane. The dial 10 is assembled with a sleeve 7 through a pin, and the sleeve 7 has a spring 14 and a mandrel 9. The spring 14 is always in a compressed state, thereby pushing the mandrel 9 upward and ensuring that the mandrel 9 is tightly attached to the dial 10. The sleeve 7 is positioned and fixed by an external thread sleeve 8, which is connected with the valve cover 4 through a thread, and a fastening nut 15 is used to lock the position of the external thread sleeve 8. When the dial 10 is pushed downward to the horizontal position, the dial 10 pushes the mandrel 9 to push the top post 6 in the valve cover 4 downward, so that the top post 6 extrudes the diaphragm 2 downward, thereby blocking the flow channel and closing the valve. When the dial 10 is in the vertical position, the mandrel 9 is pushed upward by the spring 14, and the top post 6 loses the downward pressure, so that the diaphragm 2 returns to the natural state, the flow channel is opened, and the valve is opened.

[0045] The device is simple to operate and easy to use. The unique dial 10 is used as an action switch. When the dial 10 is in the vertical direction, the diaphragm valve is in the open state. When the dial 10 is pushed to the horizontal direction, the diaphragm valve is in the closed state. Compared with the rotary knob type manual diaphragm valve, the structure is more simple and clear in operation, compact in structure, small in space occupation, and wide in application range.

[0046] The device has good adjustability. The external thread sleeve 8 and the valve cover 4 are connected through a thread, and the initial compression amount of the spring 14 can be changed by adjusting the thread engagement depth between the external thread sleeve 8 and the valve cover 4, thereby adapting to the small changes in the stiffness of the spring 14 and ensuring the sealing property of the diaphragm valve.

[0047] The device has the advantages of convenient disassembly and maintenance. The diaphragm valve can be divided into upper and lower parts along the small hole in the valve cover 44. The upper half includes the mandrel 9, the spring 14, the sleeve 7, the external thread sleeve 8, the fastening nut 15, the dial 10, the crimping nut 13, the locking ring 12, and the lower half includes the valve cover 4, the valve cover nut 5, the top post 6, the diaphragm 2, the valve seat 3, and the valve body 1. If the external locking ring 12 needs to be replaced, only the crimping nut 13 needs to be removed. If the mandrel 9, the spring 14, or the dial 10 needs to be replaced, only the fastening nut 15 needs to be removed. That is, the disassembly or maintenance of the upper half parts does not involve the lower half parts, which can minimize the impact of replacing parts or maintenance on the sealing property of the valve body 1.

[0048] The device has excellent valve body 1 sealing. The diaphragm valve realizes sealing in the way of hard contact between the push piece 10, the mandrel 9 and the top column 6. The mandrel 9 is pushed down by the push piece 10, and the top column 6 is pushed down by the mandrel 9, and the diaphragm 2 is pressed tightly by the top column 6. This design can effectively ensure the sealing of the valve in the closed state. The diaphragm valve adopts a threadless or springless 14 design that does not contact the process fluid, which can minimize the generation and entrapment of particulate matter and reduce process contamination. The design of the diaphragm valve can control the stress of the valve seat 3 and the diaphragm 2 to provide stable and maintenance-free service life. The valve body 1 is made of 316L VIM VAR stainless steel, which has excellent corrosion resistance and leak integrity.

[0049] The working principle of the application is as follows: (1) When the push piece 10 is in the vertical position, the spring 14 has an initial compression amount, which lifts the mandrel 9 and the sleeve 7. Since the mandrel 9 is short at the bottom and long at the top, and the lower end of the mandrel 9 does not contact the upper end surface of the top column 6, the diaphragm 2 is not pressed at this time, the flow passage is unobstructed, and the diaphragm valve is in the open state; (2) When the push piece 10 is pushed to the horizontal position, due to the structure of the push piece 10, the push piece 10 will push the mandrel 9 to move downward, so that the mandrel 9 directly pushes the top column 6 to press the diaphragm 2 downward, at this time the spring 14 is further compressed, so that the flow passage is closed, and the diaphragm valve is in the closed state; (3) The push piece 10 is pushed upward, and under the action of the spring 14, the mandrel 9 moves upward, the top column 6 loses the downward pressure of the mandrel 9 and is lifted by the diaphragm 2, the diaphragm 2 is not pressed, the flow passage is unobstructed, and the diaphragm valve returns to the open state.

[0050] In this specification, the same or similar parts between the various embodiments are referred to each other, and each embodiment focuses on the difference from other embodiments. Especially, for the embodiments described later, the description is relatively simple, and the relevant part can refer to the part of the foregoing embodiment.

[0051] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, and any skilled person in the art can easily think of changes or replacements within the technical range disclosed in the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A manually operated gas shut-off device, characterized in that The valve body, the valve cover, the diaphragm, the transmission assembly, the sleeve and the knob; the bottom of the valve body is provided with the first channel and the second channel which are communicated with the outside; the edge of the diaphragm is limited between the valve cover and the bottom of the valve body; the diaphragm and the bottom of the valve body form the communication space which is used for communicating the first channel and the second channel; the bottom of the transmission assembly abuts against the diaphragm, so that the transmission assembly is lowered to push the diaphragm to block the communication space and block the communication of the first channel and the second channel; the sleeve is located outside the transmission assembly, the sleeve is provided with the pin shaft, the pin shaft is rotationally connected with the knob, and the knob abuts against the top of the transmission assembly, so that the knob can drive the transmission assembly to be lowered.

2. The manual gas on-off device according to claim 1, characterized in that The transmission assembly comprises the mandrel and the top column; the valve cover is provided with the upper chamber and the lower chamber, the upper chamber is upwardly provided, the sleeve is installed on the upper chamber, and the mandrel penetrates through the sleeve and is lifted and lowered; the lower chamber is downwardly provided, the top column is lifted and lowered in the lower chamber, the bottom of the upper chamber is provided with the perforation which communicates with the lower chamber, the bottom of the mandrel abuts against the top of the top column through the perforation, the bottom of the top column abuts against the diaphragm, and the knob abuts against the top of the mandrel.

3. The manual gas on-off device according to claim 2, wherein The manual gas on-off device further comprises the spring; the mandrel is externally fixed with the check ring, the spring is sleeved on the mandrel below the check ring, the top of the spring abuts against the check ring, the bottom of the spring abuts against the bottom of the upper chamber, and the bottom of the sleeve is upwardly provided with the accommodating cavity which accommodates the spring and the check ring, and the top of the accommodating cavity is used for limiting the check ring, so that the spring is in the elastic compression state.

4. The manual gas on-off device according to claim 3, wherein The bottom of the outer side wall of the sleeve is circumferentially provided with the crimping ring; the manual gas on-off device further comprises the outer thread sleeve, the outer thread sleeve is sleeved on the outer side wall of the sleeve and abuts against the crimping ring, and the outer thread sleeve is threadedly connected with the internal thread of the upper chamber of the valve cover, so that the initial compression amount of the spring is changed by adjusting the screwing depth between the outer thread sleeve and the valve cover.

5. The manual gas on-off device according to claim 4, wherein The gas on-off device further comprises the fastening nut, the fastening nut is threadedly connected with the external thread of the outer thread sleeve, the fastening nut abuts against the top of the valve cover, and the outer thread sleeve is locked.

6. The manual gas on / off device according to any one of claims 2 to 5, characterized in that The pin shaft is the elastic cylindrical pin, the top of the sleeve is downwardly provided with the radial slot along the rotation plane of the knob, the knob has the pin hole, the knob passes through the radial slot, the pin hole is rotationally connected with the elastic cylindrical pin, and the knob is switched between the horizontal state and the vertical state.

7. The manual gas on-off device according to claim 6, characterized in that The distance from the hole center of the pin hole to the edge of the knob which abuts against the mandrel in the horizontal state is greater than the distance from the hole center of the pin hole to the edge of the knob which abuts against the mandrel in the vertical state, so that the mandrel is pushed to be lowered in the process that the knob is switched from the vertical state to the horizontal state.

8. The manual gas on-off device according to claim 7, wherein The valve cover comprises the cover body and the abutting ring which is circumferentially arranged at the bottom of the outer side wall of the cover body and abuts against the diaphragm; The manual gas on-off device further comprises a valve cover nut, which is sleeved on the cover body and abuts against the top of the abutting ring, and the inner wall of the valve body is threadedly connected with the outer thread of the valve cover nut.

9. The manual gas on-off device according to claim 8, characterized in that The valve cover nut is provided with a receiving ring, and the receiving ring is arranged circumferentially around the valve cover nut. The manual gas on-off device further comprises a press nut and a lock ring, and the lock ring comprises a fixed ring piece and a ring hole piece. The fixed ring piece is sleeved on the valve cover and abuts against the receiving ring, the press nut is threadedly connected with the outer thread of the valve cover, and the fixed ring piece is clamped between the press nut and the receiving ring.

10. The manual gas on-off device according to claim 9, wherein The knob has a handle block extending in a direction away from the rotation center of the knob, the handle block is used to facilitate rotation of the knob, the ring hole piece and the handle block of the knob in a horizontal state are located on the same side of the sleeve, the ring hole piece is provided with a ring hole, the ring hole is located above the handle block of the knob in a horizontal state, and the ring hole is used to insert a lock object so that the lock object is stopped on the handle block of the knob in a horizontal state.

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