Flow-limiting straight valve

Abstract

The utility model discloses a flow-limiting straight valve which comprises a main valve body, an airflow channel is formed in the main valve body, an air inlet end and an air outlet end with the central axes coincident are arranged at the two ends of the main valve body respectively, and a flow-limiting core is provided with a core head matched with the upper end of the airflow channel in shape and a stop part arranged on the side portion of the flow-limiting core. The valve body core is positioned in the main valve body, is close to one side of the air outlet end and is in threaded connection with the main valve body, and a core spring sleeve, a valve core spring and a valve core rod matched with the air outlet end are sequentially sleeved in the valve body core. The valve core rod moves in the axial direction of the core spring sleeve and is matched with the valve body core, so that the gas flow channel is opened, and in the process that the gas flow channel is disconnected with external gas equipment, the valve core rod can be pushed to move under the action of the valve core spring, the gas outlet end is rapidly closed, and gas leakage is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas valves, and particularly relates to a current-limiting straight valve. Background Art

[0002] At present, the valve body of a common liquefied gas tank on the market is mainly a closed valve, that is, a common rotary butterfly valve. When it is in use, the valve body needs to be rotated to open and close. During the use of the liquefied gas tank, if a failure occurs in the closed valve, subsequent pipelines or the user's usage end, it will cause the liquefied gas tank to leak, that is, an overcurrent phenomenon will occur when the liquefied gas passes through the valve body. However, the current closed valve does not have an overcurrent cut-off function, which will cause the liquefied gas in the liquefied gas tank to continuously flow out, thereby posing a hazard to public safety. Content of the Utility Model

[0003] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0004] A current-limiting straight valve, comprising:

[0005] A main valve body, internally formed with an air flow channel, and an air inlet end and an air outlet end with coincident central axes are respectively arranged at both ends;

[0006] A limiting lower sleeve, arranged in the air flow channel;

[0007] A current-limiting core, formed inside the limiting lower sleeve, and the two can move axially relative to each other. The current-limiting core has a core head adapted to the upper end of the air flow channel and a stop portion arranged on the side of the current-limiting core;

[0008] A valve body core, located inside the main valve body and close to the air outlet end side, and threadedly connected to the main valve body. A core spring sleeve, a valve core spring and a valve core rod cooperating with the air outlet end are sequentially sleeved inside the valve body core;

[0009] A trigger assembly, located at the side end of the main valve body and communicating with the inside of the main valve body. The trigger assembly is used to impact the current-limiting core or cooperate with the stop portion to prevent the current-limiting core from moving close to the valve body core and cooperating;

[0010] When the air outlet end cooperates with an external pressure regulating device, the valve core rod moves axially along the core spring sleeve, the head of the valve core rod moves away from or close to the air outlet end, and the air flow channel is in an open or closed state.

[0011] Further, a quick connector is arranged on the main valve body at the side of the air outlet end.

[0012] Further, the end of the core head in contact with the valve body core is conical.

[0013] Further, a plurality of support bars are circumferentially distributed on the core spring sleeve, and the support bars axially extend downward along the upper end surface of the core spring sleeve.

[0014] Further, the stop portion includes a convex block extending radially outward along the flow-limiting core.

[0015] Further, an arc-shaped groove is provided at the top of the convex block and is matched with the trigger assembly.

[0016] Further, a valve port sealing ring is provided at the air outlet end.

[0017] Further, an intake pipe is connected to the intake end of the main valve body, and the intake pipe is communicated with the air flow channel. The limiting lower sleeve is abutted against the main valve body by the intake pipe.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] When overcurrent occurs in the liquefied gas tank, the flow-limiting valve in the present application cooperates with the inner cavity of the main valve body through the flow-limiting core to close the air flow channel, thereby completing the overcurrent cut-off of the liquefied gas tank and realizing the safety protection function when the gas tank has overpressure and overcurrent;

[0020] In the utility model, after troubleshooting, the trigger assembly acts on the flow-limiting core, causing the flow-limiting core to shake, generating a gap with the air flow channel, weakening the airtightness, and enabling the air flow to circulate again to restore the normal use of the flow-limiting valve;

[0021] The air outlet end of the utility model can adjust external equipment. For example, after being connected to a pressure reducing valve, the valve core rod moves axially along the core spring sleeve and cooperates with the valve body core to open the air flow channel. During the disconnection process from the external gas-using equipment, under the action of the valve core spring, the valve core rod can be pushed to move, and the air outlet end can be quickly closed to avoid gas leakage. Description of the Drawings

[0022] Figure 1 is a three-dimensional structural schematic diagram of an embodiment of a flow-limiting straight valve of the utility model;

[0023] Figure 2 is a top view structural schematic diagram of an embodiment of a flow-limiting straight valve of the utility model;

[0024] Figure 3 is Figure 2 the sectional structural schematic diagram of A-A in

[0025] Figure 4 is an exploded structural schematic diagram of an embodiment of the utility model;

[0026] Figure 5 is Figure 4 the partial enlarged view at A in

[0027] Figure 6 This is a schematic structural diagram of the trigger assembly, the lower limit sleeve, and the current-limiting core in the embodiments of the present utility model;

[0028] The reference numerals in the accompanying drawings of the specification include:

[0029] Main valve body 1, air flow channel 10, positioning groove 11, air outlet end 12, air inlet end 13, air inlet pipe 2, lower limit sleeve 3, limit boss 30, air permeable through hole 31, current-limiting core 5, core head 50, stop portion 51, arc-shaped groove 510, trigger assembly 6, trigger end face 60, ejector rod 61, annular groove 610, valve body core 7, core spring sleeve 8, support strip 80, valve core spring 90, valve core rod 91, quick connector 92, valve port sealing ring 93. Detailed implementation manners

[0030] In order to enable those skilled in the art to better understand the present utility model, the technical solutions of the present utility model will be further described below with reference to the accompanying drawings and embodiments.

[0031] Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical diagrams, and should not be construed as a limitation to this patent; in order to better illustrate the embodiments of the present utility model, some components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. The same or similar reference numerals in the accompanying drawings of the embodiments of the present utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that if terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation to this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] As Figures 1-6 shown, a current-limiting direct valve of the present utility model includes:

[0033] Main valve body 1, with an air flow channel 10 formed inside, and an air inlet end 13 and an air outlet end 12 are respectively provided at both ends;

[0034] Lower limit sleeve 3, disposed inside the air flow channel 10;

[0035] The current-limiting core 5 is formed inside the limiting lower sleeve 3, and the two can move axially relative to each other. The current-limiting core 5 has a core head 50 adapted to the upper end of the air flow channel 10 and a stop portion 51 provided on the side of the current-limiting core 5.

[0036] When the liquefied gas tank has an overcurrent, the current-limiting valve in this application cooperates with the inner cavity of the main valve body 1 through the current-limiting core 5 to close the air flow channel 10, thereby completing the overcurrent cut-off of the liquefied gas tank and realizing the safety protection function when the gas tank has overpressure and overcurrent.

[0037] The valve body core 7 is located inside the main valve body 1 and close to the air outlet end 12 side, and is threadedly connected to the main valve body 1. A core spring sleeve 8, a valve core spring 90 and a valve core rod 91 cooperating with the air outlet end 12 are sequentially sleeved inside the valve body core 7.

[0038] The trigger assembly 6 is located at the side end of the main valve body 1 and is communicated with the inside of the main valve body 1. The trigger assembly 6 is used to impact the current-limiting core 5 or cooperate with the stop portion 51 to prevent the current-limiting core 5 from moving and cooperating close to the valve body core 7.

[0039] In the trigger assembly 6 of the present utility model, after troubleshooting, the trigger assembly 6 acts on the current-limiting core 5 to make the current-limiting core 5 shake, generate a gap with the air flow channel 10, weaken the airtightness, and make the air flow circulate again to restore the normal use of this current-limiting valve.

[0040] When the air outlet end 12 cooperates with an external pressure regulating device, the valve core rod 91 moves axially along the core spring sleeve 8, the head of the valve core rod 91 moves away from or close to the air outlet end 12, and the air flow channel 10 is in an open or closed state.

[0041] Among them, a quick connector 92 is provided on the main valve body 1 at the side of the air outlet end 12. The air outlet end 12 of the present utility model can, after being quickly connected to an external regulating device, such as a pressure reducing valve, move the valve core rod 91 axially along the core spring sleeve 8 and cooperate with the valve body core 7 to open the air flow channel 10. During the disconnection process from an external gas using device, under the action of the valve core spring 90, the valve core rod 91 can be pushed to move and quickly close the air outlet end 12 to avoid gas leakage.

[0042] The central axes of the air inlet end 13 and the air outlet end 12 in this current-limiting valve coincide, making the whole valve form a straight valve shape.

[0043] Such as Figure 3 、 Figure 6 As shown, the end of the core head 50 in contact with the valve body core 7 is conical, and the two are surface-sealed.

[0044] A plurality of support bars 80 are circumferentially distributed on the core spring sleeve 8, and the support bars 80 axially extend downward along the upper end surface of the core spring sleeve 8.

[0045] Such as Figure 3As shown, a valve port sealing ring 93 is provided at the air outlet end 12.

[0046] An intake pipe 2 is connected to the intake end 13 of the main valve body 1, and the intake pipe 2 is communicated with the air flow channel 10. The limiting lower sleeve 3 is abutted in the main valve body 1 by the intake pipe 2. The material of the intake pipe 2 can be selected as a plastic part.

[0047] One end of the intake pipe 2 is connected to the gas tank, and the other end of the intake pipe 2 is threadedly connected to the main valve body 1. During continuous screwing of the intake pipe 2, the intake pipe 2 fixes and coaxially installs the limiting lower sleeve 3 in the main valve body 1. Specifically, a limiting boss 30 is provided on the outer periphery of the bottom of the limiting lower sleeve 3. A positioning groove 11 matching with the limiting boss 30 is provided at the intake end of the main valve body 1. Through the connection between the intake pipe 2 and the main valve body 1, the limiting boss 30 is abutted in the limiting boss 30 by the intake pipe 2.

[0048] Wherein, there is a sliding gap and play between the current-limiting core 5 and the limiting lower sleeve 3, and the current-limiting core 5 can only move upward or downward along the axis of the limiting lower sleeve 3.

[0049] During normal use of the gas tank, the internal air flow or air pressure is at a normal value, the current-limiting core 5 does not move or moves upward by a certain distance, and the high-pressure gas inside the tank can normally enter the main valve body 1 from the intake pipe 2.

[0050] A number of air-permeable through holes 31 are provided on the circumferential direction of the limiting lower sleeve 3. The high-pressure gas entering the main valve body 1 passes through the air-permeable through holes 31 provided in the limiting lower sleeve 3, and enters the valve body core 7 provided in the upper part along the air flow channel 10. When an external gas-using device is connected, the gas overflows from the air outlet end 12. The outer wall of the valve body core 7 has threads and is threadedly connected to the inner wall of the main valve body.

[0051] When an overcurrent occurs in the liquefied gas tank, the current-limiting valve in the present application cooperates with the inner cavity of the main valve body 1 through the current-limiting core 5 to close the air flow channel 10, thereby completing the overcurrent cut-off of the liquefied gas tank and realizing the safety protection function when the gas tank has overpressure and overcurrent.

[0052] Specifically, under the action of the overcurrent / overpressure gas, the current-limiting core 5 moves upward along the axis of the limiting lower sleeve 3 and fits with the bottom surface of the valve body core 7, and the air flow channel 10 is closed. It should be noted that the current-limiting valve will automatically close when the air pressure / flow rate is too large. On the contrary, when the air pressure is small, the automatic closing function is not triggered.

[0053] In the daily actual use of this flow-limiting valve, after the flow-limiting valve is triggered and automatically closed, due to the air pressure inside the air tank, the flow-limiting core 5 always maintains the state of blocking the air flow channel 10, so manual intervention is required to restore the original state. The trigger assembly 6 in this embodiment is located at the side end of the main valve body 1 and is communicated with the inside of the main valve body 1. The trigger assembly 6 is used to impact the flow-limiting core 5 or cooperate with the stop portion 51 to prevent the flow-limiting core 5 from moving closer to the valve body core 7 side.

[0054] In the trigger assembly 6 of the present utility model, after troubleshooting, by the action of the trigger assembly 6 on the flow-limiting core 5, the flow-limiting core 5 is shaken, a gap is generated with the bottom surface of the valve body core 7, the airtightness is weakened, and the air flow is circulated again to restore the normal use of this flow-limiting valve.

[0055] In addition, when manufacturing this flow-limiting valve and the corresponding tank body, relevant experiments and detection operations need to be carried out, and it is necessary to ensure that the automatic closing and flow interruption function cannot be triggered to meet the requirements of detection and the like.

[0056] The stop portion 51 provided on the flow-limiting core 5 can cooperate with the trigger assembly 6 to prevent the flow-limiting core 5 from sliding upward relative to the limit lower sleeve 3, avoiding the cooperation between the head of the flow-limiting core 5 and the bottom surface of the valve body core 7, so as to meet the requirements of exhausting or vacuuming in the detection operation of the air tank and keep the air flow channel 10 always in an open state.

[0057] Such as Figure 6 shown, specifically, the stop portion 51 includes a convex block extending radially outward along the flow-limiting core 5, and the top of the convex block has an arc-shaped groove 510 for cooperating with the trigger assembly 6.

[0058] Specifically, the trigger assembly 6 has a push rod 61 that acts on the flow-limiting core 5. Before carrying out relevant experiments and detection operations, by pressing the trigger assembly 6, the push rod 61 extends to the radial side of the flow-limiting core 5. When the flow-limiting core 5 is acted on by high-pressure gas and moves upward, due to the action of the push rod 61 on the convex block, the upward movement of the flow-limiting core 5 is blocked. Different from opening a ring-shaped retaining piece on the flow-limiting core 5, the setting of this convex block can reduce the resistance of high-pressure gas in the air flow channel 10, and the gas flow is smoother.

[0059] During the relevant test process, in order to keep the push rod and the convex block in cooperation, methods such as but not limited to clips, adhesive tapes or special tools can be used to apply force to the outer end of the push rod to keep it connected to the main valve body, and after the relevant test is completed, the lateral movement restriction of the push rod is removed.

[0060] The above-mentioned trigger components 6 are all prior arts. For the specific structure and connection form, reference can be made to the technical solutions described in the patent with the application number 202311462030X. The above connection method can use the prior art and is also easy to implement, which does not fall within the protection scope of this application. Therefore, it at least has the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here.

[0061] There is no specific limitation on the specific shape and quantity of the ventilation through holes 31, including but not limited to a runway shape, a round hole shape, etc.

[0062] As Figure 6 shown, in addition, the cross-sections of the limiting lower sleeve 3 and the flow-limiting core 5 are polygon structures that are adapted to each other.

[0063] With the polygon structure provided, a proprietary adjustment tool can be inserted from the bottom of the limiting lower sleeve 3 to turn the limiting core clockwise or counterclockwise, aligning the side stop portion 51 with the ejector rod 61 to achieve the structural purpose.

[0064] There is no specific limitation on the cross-sectional shapes of the limiting lower sleeve 3 and the flow-limiting core 5, including but not limited to adapted hexagon, pentagon, quadrilateral, triangle and other structures. In this embodiment, the cross-sections of the limiting lower sleeve 3 and the flow-limiting core 5 adopt a hexagon structure.

[0065] On the side of the trigger component 6 away from the main valve body 1, there is a trigger end face 60, and the tail end of the ejector rod 61 extends out of the trigger end face 60.

[0066] As Figure 3 、 Figure 6 shown, an annular groove 610 (groove) is provided on the circumferential direction of the ejector rod 61. Since the overpressure / overflow of high-pressure gas is a small-probability event, while retaining the above-mentioned trigger recovery function, for this flow-limiting valve and the gas cylinder using this flow-limiting valve, in normal use, to prevent the operator from accidentally triggering and pressing the trigger component 6, causing the stop portion 51 to be blocked by the ejector rod 61, the trigger component 6 can be further improved. An annular groove 610 can be opened on the right side of the ejector rod 61. After exhausting or evacuating the gas cylinder, before leaving the factory, an external force is applied to the annular groove 610 to break it off. When the end user gets this flow-limiting valve, the trigger component 6 still retains the function of manually intervening and restoring the flow-limiting core 5. If a situation of excessive air pressure / flow occurs, an external tool, such as a pen / screwdriver, etc., can be used to apply force to the end of the ejector rod 61 to impact the main body of the flow-limiting core 5 by the ejector rod 61 to restore the flow-limiting valve to its initial state. Since the annular groove 610 is located inside the trigger section, it can play the role of preventing triggering.

[0067] It should be noted that this flow-limiting valve is used for high-pressure cylinders, including but not limited to those used for liquefied petroleum gas, dimethyl ether, etc.

[0068] The above are only embodiments of the present utility model. Specific structures and common knowledge such as characteristics well-known in the art are not described in detail herein. Those of ordinary skill in the art know all the common general technical knowledge in the technical field to which the utility model belongs before the application date or the priority date, can acquire all the existing technologies in this field, and have the ability to apply the conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, combine their own abilities to complete and implement this solution. Some typical well-known structures or well-known methods should not become obstacles for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent.

Claims

1. A flow limiting straight valve, characterized in that: include: The main valve body has an air flow channel formed inside, and an air inlet end and an air outlet end whose central axes coincide with each other are respectively formed at both ends; A limit lower sleeve is arranged in the air flow channel; The flow limiting core is formed inside the limiting lower sleeve, and the two can move axially relative to each other, and the flow limiting core has a core head conforming to the upper end of the air flow channel and a stopper arranged on the side of the flow limiting core; The valve body core is located in the main valve body and close to the air outlet end, and is threadedly connected to the main valve body. The valve body core is sequentially sleeved with a core spring sleeve, a valve core spring, and a valve core rod matched with the air outlet end; A trigger assembly is located at the side end of the main valve body and communicated with the interior of the main valve body, and the trigger assembly is used to impact the flow limiting core or cooperate with the stopper to prevent the flow limiting core from moving close to the valve body core and cooperating; When the gas outlet is matched with an external pressure regulating device, the valve core rod moves axially along the core spring sleeve, the valve core rod head moves away from or close to the gas outlet, and the gas flow channel is in an open or closed state.

2. A flow limiting straight valve as claimed in claim 1, characterized in that: The main valve body is provided with a quick connector at one side of the gas outlet end.

3. A flow limiting straight valve according to claim 1 or 2, characterized in that: The end of the core head in contact with the valve body core is tapered.

4. A flow limiting straight valve as claimed in claim 3, characterized in that: The core spring sleeve is provided with a plurality of support strips distributed in the circumferential direction, and the support strips extend axially downward along the upper end surface of the core spring sleeve.

5. A flow limiting straight valve as claimed in claim 1, 2 or 4, characterized in that: The stopper portion includes a protrusion extending radially outward along the limiting core.

6. A flow limiting straight valve as claimed in claim 5, characterized in that: The top of the protrusion is provided with an arc-shaped groove matched with the trigger component.

7. A flow limiting straight valve as claimed in claim 1 or 2 or 4 or 6, characterized in that: A valve port sealing ring is arranged at the gas outlet end.

8. A flow limiting straight valve as claimed in claim 7, characterized in that: An air intake pipe is connected to the air intake end of the main valve body, and the air intake pipe is communicated with the air flow channel, and the lower limit sleeve is connected to the main valve body by the air intake pipe.

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