Liquefied gas cylinder valve device and valve system

Abstract

The utility model provides a liquefied gas cylinder valve device and a valve system. The liquefied gas cylinder valve device and the valve system improve the use safety performance of liquefied gas. The liquefied gas cylinder valve device comprises a first elastic piece, a first valve needle and a valve body, the valve body is provided with a valve port part, and the first valve needle is used for blocking or opening the valve port part; the liquefied gas cylinder valve device further comprises a locking part, and the locking part is used for being matched with the first valve needle in an inserted mode so that the first valve needle can be kept away from the valve port part in the leakage cut-off direction. Or under the state that the gas consumption equipment leaks, the locking part can be driven to be separated from the first valve needle; the first elastic piece is elastically connected between the valve body and the first valve needle, and under the condition that the locking part is disengaged from the first valve needle, the first elastic piece drives the first valve needle to move in the leakage cut-off direction to form a sealing pair with the valve port part.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and in particular to a liquefied gas cylinder valve device and a valve system. Background Art

[0002] In recent years, liquefied petroleum gas, as a new type of fuel, has quickly entered people's lives with its advantages of convenience, speed and cleanliness. The use of bottled liquefied petroleum gas generally requires a liquefied gas cylinder (including a liquefied gas cylinder valve), a pressure regulator, a hose, a stove, etc. Leakage in the above places will bring about the risk of combustion and explosion, seriously threatening the safety of users' lives and property. Utility Model Content

[0003] The utility model aims to provide a liquefied gas cylinder valve device and a valve system to improve the safety performance of liquefied gas use.

[0004] To achieve the above-mentioned purpose, the utility model provides a liquefied gas cylinder valve device, comprising a first elastic member, a first valve needle and a valve body, the valve body being provided with a valve mouth portion, the first valve needle being used to block or open the valve mouth portion; the liquefied gas cylinder valve device also comprises a locking portion, the locking portion being used to form a plug-in fit with the first valve needle to keep the first valve needle away from the valve mouth portion in a leakage cut-off direction; or, in a state where a leakage occurs in a gas-using equipment, the locking portion can be driven to disengage from the first valve needle; the first elastic member is elastically connected between the valve body and the first valve needle, and when the locking portion is disengaged from the first valve needle, the first elastic member drives the first valve needle to move along the leakage cut-off direction to form a sealing pair with the valve mouth portion.

[0005] Optionally, a second elastic member is further included, which is elastically connected between the valve body and the locking portion. When the first valve needle and the valve port form a sealing pair, the second elastic member drives the locking portion to abut against the side wall of the first valve needle. In the leakage cut-off direction, the abutting position is at least partially located on the rear side of the plug-in position of the locking portion and the first valve needle.

[0006] Optionally, the valve device also includes a guide rod extending in the plug-in direction, the guide rod is fixedly connected to the valve body, the second elastic member and the locking portion are both sleeved on the guide rod, and the second elastic member is located on the rear side of the locking portion in the plug-in direction.

[0007] Optionally, the valve body forms a valve cavity, an annular step is provided in the valve body, the annular step defines the valve opening, and the valve opening divides the valve cavity formed by the valve body into a first sub-cavity and a second sub-cavity;

[0008] The first valve needle is arranged in the first sub-chamber, and the second valve needle is arranged in the second sub-chamber, and the second valve needle can move up and down along the leakage cut-off direction;

[0009] The first valve needle is provided with a convex rod axially protruding from the first valve needle, and the convex rod is used to cooperate with the second valve needle. When the first valve needle forms a sealing pair with the valve mouth, part of the convex rod is located at the valve mouth, and part of it is located at the second sub-cavity.

[0010] Optionally, the first valve needle is provided with a locking groove, the locking groove is radially concave, the locking groove is provided with a guiding slope, the guiding slope is used to form a sliding fit with the locking portion; the guiding slope gradually shrinks from the groove side toward the groove bottom side.

[0011] Optionally, the first valve needle includes a needle body and two convex rings, both of which protrude radially outward from the side wall surface of the needle body, and in the leakage cutting direction, the locking groove is defined between the two convex rings.

[0012] The present application also provides a liquefied gas cylinder valve system, including a control module, a detection module, a driving device and the above-mentioned liquefied gas cylinder valve device, the control module, the detection module and the driving device form a signal connection, the driving device is arranged on the outside of the valve body, and when a gas-using equipment leaks, the driving device is used to drive the locking part to disengage from the first valve needle.

[0013] Optionally, the liquefied gas cylinder valve system further includes an alarm module, and the alarm module is signal-connected to the control module.

[0014] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0016] Figure 1 It is a schematic diagram of the structure of the liquefied gas cylinder valve device in the embodiment of the utility model, state one;

[0017] Figure 2 This is a schematic diagram of the structure of the liquefied gas cylinder valve device in the embodiment of the utility model, state 2;

[0018] Figure 3 This is a schematic diagram of the structure of the liquefied gas cylinder valve device in the embodiment of the utility model, state three;

[0019] Figure 4is a schematic diagram of a liquefied gas cylinder valve system in an embodiment of the utility model;

[0020] Figure 5 It is a diagram of the components of the liquefied gas cylinder valve system in the embodiment of the utility model.

[0021] Figure 1-Figure 5 middle:

[0022] 100, valve body; 101, valve port; 101', annular step; 101a, flange; 102, expansion structure;

[0023] 201, first valve needle; 211, first convex ring; 211a, first groove wall; 211b, second groove wall; 2112, convex rod; 212, second convex ring; 212a, guide slope; 212b, plane section; 213, locking groove; 214, sealing ring; 215, needle body;

[0024] 202, second valve needle; 202a, blocking end; 202a-1, sealing block;

[0025] 300, locking assembly; 302, locking portion; 303, second elastic member; 304, guide rod;

[0026] 400, a first elastic member;

[0027] 500, bracket;

[0028] 601, first sub-cavity; 602, second sub-cavity;

[0029] 701, driving device;

[0030] 800. Liquefied gas cylinder. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] The present application discloses a liquefied gas cylinder valve device, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the liquefied gas cylinder valve device includes a valve body 100, which encloses a valve cavity, in which a first valve needle 201 is arranged, and the valve cavity is provided with a valve mouth portion 101, and the valve mouth portion 101 has a valve port; the liquefied gas cylinder 800 is connected with the gas-using equipment through the valve mouth portion 101; the liquefied gas cylinder valve device also includes a locking assembly 300, and the locking assembly 300 specifically includes a locking portion 302 for forming a plug-in fit with the first valve needle 201 to keep the first valve needle 201 away from the valve mouth portion 101 in the leakage cut-off direction; or, the locking portion 302 can be driven to disengage from the first valve needle 101.

[0033] The liquefied gas cylinder valve device also includes a first elastic member 400, which is elastically connected between the valve body 100 and the first valve needle 201. When the locking portion 302 is disengaged from the first valve needle 201, the first elastic member 400 drives the first valve needle 201 to move forward along the leakage cut-off direction to form a sealing pair with the valve mouth 101. The leakage cut-off direction is located in the axial direction of the first valve needle 201, and specifically refers to the direction of the valve mouth 101 in the axial direction of the first valve needle 201, that is, Figure 1 The direction indicated by the arrow. Figure 1 The leakage cut-off direction indicated by the middle arrow is defined as a reference, that is, the axial direction of the first valve needle 201 , the side from the first valve needle 201 to the valve port 101 is the front, and the opposite direction is the rear.

[0034] The locking portion 302 can move in a direction perpendicular to the leakage cut-off direction (radial direction of the first valve needle 201) toward the side close to the first valve needle 201 to form a radial plug-in connection with the first valve needle 201, thereby limiting the axial position of the first valve needle 201 to keep the first valve needle 201 at a position away from the valve mouth 101; or, the locking portion 302 moves in the reverse direction, that is, moves in a direction perpendicular to the leakage cut-off direction (radial direction of the first valve needle 201) toward the side away from the first valve needle 201 to disengage from the first valve needle 201; specifically, one of the first valve needle 201 and the locking portion 302 is provided with a locking groove 213, and the other is provided with a locking portion 302 adapted to the locking groove 213; the locking portion 302 can form a plug-in connection with the first valve needle 201 to form a stop in the leakage cut-off direction to keep the first valve needle 201 away from the valve mouth 101.

[0035] See also Figure 1-Figure 3 The first valve needle 201 is provided with a locking groove 213, which is radially concave along the outer circumference of the first valve needle 201; in the locked position, the locking groove 213 and the locking portion 302 are plugged and matched along the radial direction of the first valve needle 201 to form an axial limit for the first valve needle 201. In this way, the first valve needle 201 is kept away from the valve mouth 101, and the valve mouth 101 is in an open state.

[0036] A first elastic member 400 is also provided in the valve cavity, and one end of the first elastic member 400 is directly against the valve body 100; alternatively, a bracket 500 is fixedly provided in the valve body 100, and one end of the first elastic member 400 is indirectly against the valve body 100 via the bracket 500, and the other end of the first elastic member 400 is against the first valve needle 201; when the first valve needle 201 is plugged into the locking portion 302, the first elastic member 400 is in an elastic deformation state; when a leak occurs in the gas-using equipment, the locking portion 302 is driven to disengage from the locking groove 213, and under the action of the first elastic member 400, the first valve needle 201 moves forward (axially) along the leakage blocking direction to gradually approach and block the valve mouth 101.

[0037] The present application also provides a liquefied gas cylinder valve system, such as Figure 4 and Figure 5 As shown, the system includes a control module, a detection module, a drive device 701 and the aforementioned liquefied gas cylinder valve device, the drive device 701 can be an electromagnetic drive component; the control module, the detection module and the drive device form a signal connection, the detection module is used to identify whether a gas-using device has a gas leak, the drive device 701 is arranged on the outside of the valve body 100, and when the gas-using device is leaking, the drive device 701 is used to drive the locking portion 302 to disengage from the first valve needle 201.

[0038] The present application also provides a control method for a liquefied gas cylinder valve system, the control method comprising:

[0039] When the recognition result of the detection module is yes, the detection module sends a first signal;

[0040] The control module obtains the first signal, generates a second signal, and sends it outward;

[0041] The driving device 701 obtains the second signal, and drives the locking portion 302 to disengage from the first valve needle 201 .

[0042] In actual operation, the detection module is used to detect whether the gas-using equipment has a gas leak. When the gas-using equipment is in a normal state and has no gas leak, the locking assembly 300 is in a locked position, that is, the locking portion 302 is radially plugged into the first valve needle 201 to form an axial limit. At this time, the first valve needle 201 compresses the first elastic member 400, and the first valve needle 201 is away from the valve mouth portion 101 to open the valve mouth portion 101; when the detection module detects that the gas-using equipment has a gas leak, the control module receives the first signal and sends a second signal to the drive device 701. After receiving the second signal, the drive device 701 drives the locking portion 302 to move radially outward (radially away from the valve mouth portion 101). The first valve needle 201 moves on one side) to disengage from the first valve needle 201. At this time, the first valve needle 201 loses the axial stop of the locking portion 302, and the first elastic member 400 restores its elastic deformation, so that the first valve needle 201 moves axially upward under the action of the first elastic member 400 to approach and close the valve mouth portion 101; in this way, after detecting a gas leak in the gas-using equipment, the liquefied gas cylinder valve device can be automatically disconnected; thereby preventing the liquefied gas from leaking to the outside, and then being able to cut off the leaking gas at the source, thereby improving the safety of the use of liquefied gas; wherein, the detection module can be a liquefied gas leak detector and other devices, which can be selected by technicians in this field.

[0043] Furthermore, the liquefied gas cylinder valve system also includes an alarm module, which is connected to the control module signal; the control method also includes: the control module obtains the first signal, generates a third signal, and sends it to the outside; the alarm module obtains the third signal, and alarms to the outside; thereby, an alarm can be issued to the outside to remind maintenance personnel to perform maintenance; of course, the valve system also includes a power module to power the control module, the detection module, the drive device 701 and the alarm module.

[0044] In this embodiment, if Figure 2 and Figure 3 As shown, a specific solution for resetting the valve mouth 101 after being blocked is provided.

[0045] As shown in the figure, the valve device also includes a second valve needle 202 and a second elastic member 303. The second elastic member 303 is elastically connected between the valve body 100 and the locking portion 302. The second elastic member 303 cooperates with the driving device 701. When the driving device 701 drives the locking portion 302 to move radially to the left, it compresses the second elastic member 303. After the driving device 701 is powered off, the second elastic member 303 can restore elastic deformation in the radial direction to drive the locking portion 302 to move radially toward the first valve needle 201 again until it abuts against the side wall of the first valve needle 201. At this time, since the first valve needle 201 Under the push of the first elastic member 400, the locking groove 213 moves axially forward, and the axial position of the locking groove 213 also moves forward, that is, the locking groove 213 and the locking portion 302 are axially misaligned, and the locking groove 213 is now located at the front side of the locking portion 302; at this time, in the leakage cut-off direction, under the action of the second elastic member 303, the locking portion 302 abuts against the side wall of the first valve needle 201, but the abutting position of the two is at least partially located at the rear side of the locking groove 213 (that is, the locking portion 302 does not form a plug-in relationship with the locking groove 213 at this time, and the locking portion 302 does not constitute an axial limit to the first valve needle 201); thus, the locking portion 302 302 is in a waiting state, that is, when the first valve needle 201 moves axially backward (reset), the locking portion 302 can automatically slide into the locking groove 213. In this way, the locking portion 302 and the locking groove 213 can be automatically plugged into each other through the mechanical structure, avoiding the introduction of a complex electrical control system; in addition, by arranging the second elastic member 302 to cooperate with the driving device 701, the energy waste caused by the continuous operation of the driving device 701 is avoided. In the method of the present application, it is only necessary to energize the driving device 701 when the locking portion 302 is disengaged from the first valve needle 201; in this embodiment, The driving device 701 is an electromagnetic driving component. As shown in the figure, the driving device 701 is sleeved on the outer side of the valve body 100 and is compatible with the locking part 302; specifically, the locking assembly 300 also includes a guide rod 304 fixed to the valve body 100, and the locking part 302 is sleeved on the guide rod 304. The guide rod 304 extends radially, thereby forming a guiding effect on the locking part 302 in the radial direction. The guide rod 304 is fixedly connected to the valve body 100, and the second elastic member 303 and the locking part 302 are both sleeved on the guide rod 304. One end of the second elastic member 303 is against the valve body 100 in the radial direction, and the other end is against the locking part 302.

[0046] The specific method of axially resetting the first valve needle 201 is described below by way of example.

[0047] Please continue to refer to Figure 2 and Figure 3The valve device further comprises a second valve needle 202, which is axially arranged at two ends of the valve mouth 101 with the first valve needle 201, and the second valve needle 202 can move forward and backward along the axial direction; for example, the second valve needle 202 is threadedly connected to the valve body 100, and one end of the second valve needle 202 extends out of the valve body 100, and the second valve needle 202 is manually screwed to drive it to move forward and backward along the axial direction; wherein, the second valve needle 202 moves toward the side close to the valve mouth 101 for its backward movement, at which time, the second valve needle 202 gradually approaches the first valve needle 201 axially, and conversely, when it moves in a direction away from the valve mouth 101 and the first valve needle 201, the second valve needle 202 moves forward; in the technical solution of the present application, The second valve needle 202 is the original structure of the valve device, which is used to open and close the valve mouth portion 101; that is, under normal use, the opening and closing of the valve device are controlled by the second valve needle 202, and the first valve needle 201 blocks the valve mouth portion 101 in a leaking state; when the first valve needle 201 closes the valve mouth portion 101, the second valve needle 202 is driven to move axially backward to approach and gradually form a transmission with the first valve needle 201, so as to axially push the first valve needle 201 away from the valve mouth portion 101. In this way, the original second valve needle 202 of the valve device can be used to push the first valve needle 201 to open the valve mouth portion 101, without the need to add other devices to open the valve mouth portion 101, thereby simplifying the structure of the valve device.

[0048] In a specific implementation, an annular step 101' is formed in the valve body 100, and the annular step 101' serves as the aforementioned valve mouth portion 101. The valve mouth portion 101 divides the valve cavity surrounded by the valve body 100 into a first sub-cavity 601 and a second sub-cavity 602. A first valve needle 201 is arranged in the first sub-cavity 601, and a second valve needle 202 is arranged in the second sub-cavity 602. The first valve needle 201 is provided with a convex rod 2112, and the convex rod 2112 protrudes axially from the first valve needle 201 to cooperate with the second valve needle 202. After the first valve needle 201 forms a sealing pair with the valve mouth portion 101, part of the convex rod 2112 is located in the valve mouth portion 101, and part of it extends from the valve mouth portion 101 into the second sub-cavity 602. At this time, the second valve needle 202 moves axially backward and will gradually approach and abut against the convex rod 2112. Continue to move the second valve needle 202 axially backward, and the second valve needle 202 can push the first valve needle 201 to move backward stepwise and away from the valve mouth portion 101 through the protruding rod 2112. The dimension of the second valve needle 202 in axially pushing the first valve needle 201 backward is limited by the dimension of the protruding rod 2112 extending out of the valve mouth portion 101, and can be set by a person skilled in the art. In the present embodiment, the valve mouth portion 101 is limited by the inner ring wall of the annular step 101', which extends a certain length in the axial direction, and forms an upper valve port on the upper end face of the annular step 101' and a lower valve port on the lower end face respectively. The first valve needle 101 is used to block the lower valve port, and the second valve needle 201 can block the upper valve port during the backward movement. When one of the upper valve port and the lower valve port is blocked, the valve mouth portion 101 is in a blocked state, and the valve device is cut off.

[0049] Optionally, the protruding rod 2112 may also be arranged on one side of the second valve needle 202, which is not specifically limited here, so as to enable the second valve needle 202 to push open the first valve needle 101; in addition to manually driving the second valve needle 202 to move axially, the second valve needle 202 may also be driven axially by an external electromagnetic drive component or a motor, and the second valve needle 202 may be threadedly connected to the valve body 100, or the second valve needle 202 may be only indirectly connected to the valve body 100, so as to enable the second valve needle 202 to move axially, which is not specifically limited here.

[0050] When the gas-using equipment stops leaking and works normally, the second valve needle 202 is driven to push the first valve needle 201 away. As mentioned above, the locking portion 302 is now against the outer wall of the first valve needle 201 and is located at the rear side of the locking groove 213. When the first valve needle 210 is pushed axially backward relative to the locking portion 302 by the second valve needle 202, the locking portion 302 gradually moves axially closer to the locking groove 213 until it slides into the locking groove 213 to form an axial limit with the first valve needle 201.

[0051] Alternatively, if Figure 3As shown, the locking groove 213 is provided with a guiding bevel 212a, and the guiding bevel 212a is used to form a sliding fit with the locking portion 302; the guiding bevel 212a gradually retracts from the groove side toward the groove bottom side; at this time, the locking portion 302 can contact the guiding bevel 212a during the process of moving to the right (moving toward the side close to the first valve needle 201), so that under the action of the guiding bevel 212a, the first valve needle 201 is further pulled down until the locking portion 302 slides into the locking groove 213; by providing the guiding bevel 212a, the axial length of the protruding rod 2112 extending out of the valve mouth portion 101 can be shortened, thereby reducing the axial size of the valve device.

[0052] In an embodiment of the present application, the step of opening the valve device specifically includes:

[0053] First, in the process of the second valve needle 202 moving backward to gradually close the upper valve port, the second valve needle 202 can drive the first valve needle 201 to move toward the side away from the valve port portion 101 until the first valve needle 201 is pushed open, and the valve port portion 101 is connected to the first sub-chamber 601 through the lower valve port, and the gas in the liquefied gas cylinder enters the first sub-chamber 601 from the first sub-chamber through the lower valve port, and the upper valve port is sealed by the second valve needle 202, so the upper and lower air pressures of the first valve needle 201 are balanced at this time;

[0054] Then, the locking portion 302, under the cooperation between the second elastic member 303 and the guiding inclined surface 212a, drives the first valve needle 201 to continue to move toward the side away from the valve port 101 until the first valve needle 201 and the locking portion 302 resume radial insertion.

[0055] At this time, since the upper valve port is closed by the second valve needle 202, in order to open the valve device, the second valve needle 202 needs to be moved in the reverse direction so as to gradually move away from the upper valve port and open the upper valve port.

[0056] The structure of the valve device of the present application is further detailed and illustrated by two specific embodiments below.

[0057] Embodiment 1

[0058] In this embodiment, the specific structure of the first valve needle 201 is illustrated by way of example; the first valve needle 201 includes a needle body 215 and two convex rings, both of which radially protrude outward from the side wall surface of the needle body 215, and in the leakage cut-off direction, a locking groove 213 is defined between the two convex rings; specifically, the first valve needle 201 includes a radially protruding first convex ring 211 and a second convex ring 212, and a locking groove 213 is formed between the first convex ring 211 and the second convex ring 212; the lower surface of the first convex ring 211 is the locking groove 213 The groove wall, the upper surface is the end surface of the first valve needle 201 to seal the valve mouth 101; the side of the second convex ring 212 facing the first convex ring 211 is the upper surface, and the upper surface is the other groove wall of the locking groove 213; the guiding bevel 212a is located on the upper surface of the second convex ring 212; the part of the upper surface of the second convex ring 212 close to the groove is axially convex to form a bevel section as a guiding bevel 212a, and the part close to the bottom of the groove is an approximately flat section 212b, so that it can form an axial stop with the locking portion 302.

[0059] Optionally, a sealing ring 214 is provided at the top end of the first valve needle 201, and the sealing ring 214 can abut against the inner wall of the valve body 100. The part where the sealing ring 214 abuts against the inner wall of the valve body 100 surrounds the outer side of the valve mouth 101; the valve mouth 101 is sealed by the sealing ring 214, which can achieve a better sealing effect.

[0060] Optionally, the top of the first convex ring 211, i.e., the first valve needle 201, is provided with an annular receiving groove, and the sealing ring is embedded in the receiving groove; the receiving groove is located on the side of the locking groove 213 close to the valve mouth; the receiving groove has a first groove wall 211a and a second groove wall 211b opposite to each other in the axial direction, and the first groove wall 211a is closer to the valve mouth 101 than the second groove wall 211b, and the second groove wall 211b presses the sealing ring against the inner wall of the valve body 100 to seal the valve mouth 101; the first groove wall 211a only forms an axial stop for the inner ring side of the sealing ring, so as to avoid the first groove wall 211a accidentally touching the valve body 100 when the sealing ring abuts against the valve body 100, causing interference.

[0061] In a specific implementation, the valve body 100 is provided with a flaring structure 103, and the flaring structure 103 is connected to the valve opening 101. The radial dimension of the flaring structure 103 gradually expands toward the position close to the first valve needle 201, and the sealing ring 214 abuts against the side wall of the flaring structure 103; the first groove wall 211a forms an axial stop for the inner ring side of the sealing ring, and the second groove wall 211b presses the outer ring side of the sealing ring against the side wall of the flaring structure 103; by providing the flaring structure 103, the force of the outer ring side of the sealing ring against the side wall of the flaring structure 103 can be increased, thereby improving the sealing effect of the sealing ring on the valve opening 101.

[0062] Embodiment 2

[0063] In this embodiment, the structure of the second valve needle 202 is illustrated by way of example. In order to improve the integration of the liquefied gas cylinder valve device and simplify the structure of the liquefied gas cylinder valve device, the end of the second valve needle 202 that can abut against the first valve needle 201 is defined as a blocking end 202a. The blocking end 202a is provided with a mounting groove, and a sealing block 202a-1 is arranged in the mounting groove. On the one hand, the end face of the sealing block 202a-1 can cooperate with the protruding rod 2112 of the first valve needle 201, and on the other hand, the end face of the sealing block 202a-1 can block the upper valve port.

[0064] Optionally, an annular flange 101a is provided on the end surface of the annular step 101 ′ close to the second valve needle 202 ; the flange 101a is tightly pressed against the end surface of the sealing block 202a - 1 ; this can improve the sealing performance between the sealing block 202a - 1 and the valve port 101 .

[0065] The technical solution of the present application improves the specific structure of the valve device, so that when a gas leak occurs in the gas-using equipment, the valve device can be cut off in time to improve the safety of liquefied gas use; at the same time, after the leak is repaired, the valve device can be reopened to improve the repeated utilization rate of the liquefied gas cylinder; in particular, on the one hand, the present application arranges a locking assembly 300 in the valve device, and the locking assembly 300 is located in the valve body 100, and arranges a driving device 701 outside the valve body 100, and the driving device 701 is in the form of an electromagnetic driving part, and the locking assembly 300 is driven by electromagnetic force to cut off the valve mouth, thereby avoiding damage to the valve body 100; on the other hand, a valve system with a control module, a detection module and a driving device 701 is developed, so as to detect the leakage state of the liquefied gas cylinder, and at the same time, the valve device can be automatically cut off, thereby improving the overall intelligence of the valve system.

[0066] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A liquefied gas cylinder valve device, connected between a liquefied gas cylinder and a gas-using device, characterized in that: It comprises a first elastic member, a first valve needle and a valve body, wherein the valve body is provided with a valve opening, and the first valve needle is used to block or open the valve opening; The liquefied gas cylinder valve device further comprises a locking portion, which is used to form a plug-in fit with the first valve needle to keep the first valve needle away from the valve mouth in the leakage cut-off direction; or, in the state where the gas-using equipment leaks, the locking portion can be driven to disengage from the first valve needle; The first elastic member is elastically connected between the valve body and the first valve needle. When the locking portion is disengaged from the first valve needle, the first elastic member drives the first valve needle to move along the leakage cut-off direction to form a sealing pair with the valve port.

2. The liquefied gas cylinder valve device according to claim 1, characterized in that: It also includes a second elastic member, which is elastically connected between the valve body and the locking portion. When the first valve needle and the valve port form a sealing pair, the second elastic member drives the locking portion to abut against the side wall of the first valve needle. In the leakage cut-off direction, the abutting position is at least partially located on the rear side of the plug-in position between the locking portion and the first valve needle.

3. The liquefied gas cylinder valve device according to claim 2, characterized in that: The valve device also includes a guide rod extending in the plug-in direction, the guide rod is fixedly connected to the valve body, the second elastic member and the locking portion are both sleeved on the guide rod, and the second elastic member is located at the rear side of the locking portion in the plug-in direction.

4. The liquefied gas cylinder valve device according to claim 2, characterized in that: The valve body forms a valve cavity, an annular step is provided in the valve body, the annular step defines the valve opening, and the valve opening divides the valve cavity formed by the valve body into a first sub-cavity and a second sub-cavity; The first valve needle is arranged in the first sub-chamber, and the second valve needle is arranged in the second sub-chamber, and the second valve needle can move up and down along the leakage cut-off direction; The first valve needle is provided with a convex rod axially protruding from the first valve needle, and the convex rod is used to cooperate with the second valve needle. When the first valve needle forms a sealing pair with the valve mouth, part of the convex rod is located at the valve mouth, and part of it is located at the second sub-cavity.

5. The liquefied gas cylinder valve device according to claim 2, characterized in that: The first valve needle is provided with a locking groove, the locking groove is concave inwardly in the radial direction, the locking groove is provided with a guiding inclined surface, the guiding inclined surface is used to form a sliding fit with the locking portion; the guiding inclined surface gradually shrinks from the notch side toward the groove bottom side.

6. The liquefied gas cylinder valve device according to claim 5, characterized in that: The first valve needle comprises a needle body and two convex rings, both of which radially protrude outwardly from the side wall surface of the needle body, and in the leakage cutting direction, the locking groove is defined between the two convex rings.

7. A liquefied gas cylinder valve system, characterized in that: It comprises a control module, a detection module, a driving device and a liquefied gas cylinder valve device as described in any one of claims 1 to 6, wherein the control module, the detection module and the driving device form a signal connection, the driving device is arranged on the outside of the valve body, and when a gas-using equipment leaks, the driving device is used to drive the locking portion to disengage from the first valve needle.

8. The liquefied gas cylinder valve system according to claim 7, characterized in that: The liquefied gas cylinder valve system further comprises an alarm module, and the alarm module is signal-connected to the control module.

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