Flow-adjustable overflowing device
By designing a flow adjustable overcurrent device including adjusting parts, sliding seats and overcurrent springs, the problem of fixed flow thresholds in existing safety valve products is solved, and the flexible adjustment of flow thresholds is achieved, which improves the applicability and safety of the equipment and reduces maintenance costs.
Patent Information
- Application Number
- CN202422076522.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-26
AI Technical Summary
The flow threshold of existing safety valve products is fixed and cannot adapt to the differences in working conditions in different industries and regions, resulting in automatic valve closing due to changes in flow value in different application scenarios, affecting use and increasing maintenance costs.
A flow-adjustable overcurrent device is designed to control the position of the sliding seat through the adjusting member, adjust the movement of the valve core, the overcurrent spring and the end cover, and adjust the overcurrent threshold. The device includes an intake passage, a sealing ring, a return spring, a valve core, a sliding seat, an overflow spring and an end cover. Through the coordination of the flow adjustment shaft and the limit cap, a rapid adjustment of the flow threshold is achieved.
By adjusting the flow threshold, the problem of automatic valve closing due to flow changes is avoided, the applicability and flexibility of the safety valve is improved, maintenance costs are reduced, and the risk of airtightness caused by disassembly and reinstallation is reduced.
Smart Images
Figure CN223019540U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of safety valve accessories, and particularly relates to a flow adjustable overcurrent device. Background Art
[0002] In the gas safety fields such as gas and toxic gases, safety valves (such as timing valves, solenoid valves, electric valves, etc.) play a crucial role when using an overcurrent device as a fitting. When the flow rate increases to the maximum value designed for overcurrent, or the pipeline at the outlet end falls off resulting in underpressure, the overcurrent device will automatically close the valve to ensure that no safety hazards are caused by overcurrent or underpressure.
[0003] However, the working conditions in different industries and regions vary significantly, which means that the required flow threshold of the safety valve will also be different. Existing safety valve products often adopt a fixed flow setting value. When applied to different industries and regions, the normal use of the product is often affected due to different flow values, restricting the use areas and application scenarios of the product. If the safety valve product continues to be used, due to the large difference in the conveyed flow value, the safety valve often automatically closes the valve due to the change of the flow value (this flow value belongs to the normal value), affecting the work or life of users. When after-sales personnel solve such problems, they usually need to remove the pipeline, replace parts or the safety valve. There is a risk of damaging the airtightness of the pipeline during the disassembly and reinstallation process, which may cause the leakage of toxic gases or gas; in addition, since the replacement of parts or the installation of the safety valve all require professional personnel to be present for handling, the cost is greatly increased. Summary of the Utility Model
[0004] The utility model aims to provide a flow adjustable overcurrent device to solve the problem of the fixed flow threshold of current safety valve products.
[0005] A flow adjustable overcurrent device in this solution includes a fixed seat provided with an air inlet passage. An airtight ring, a return spring, a valve core, a sliding seat, an overcurrent spring and an end cover are sequentially arranged in the air inlet passage. The airtight ring is fixed at the air outlet end of the air inlet passage. The return spring is located between the airtight ring and the sliding seat, and both ends of the return spring respectively abut against the walls of the fixed seat and the sliding seat. The valve core includes a connecting rod and a circular baffle fixedly connected to the connecting rod. The diameter of the baffle is larger than the outer diameter of the airtight ring. The sliding seat is evenly provided with air inlet holes for gas to pass through. One end of the connecting rod penetrates through the sliding seat and is slidably connected thereto. The baffle is located in the return spring and there is a gap between them. The end cover is fixedly connected to the end of the connecting rod far from the return spring. The overcurrent spring is sleeved on the connecting rod, and both ends of the overcurrent spring respectively abut against the sliding seat and the end cover. The fixed seat is provided with an adjusting member for controlling the sliding seat to approach or move away from the airtight ring.
[0006] Working principle and beneficial effects of this solution: When it is necessary to reduce the threshold value of the overcurrent device, the sliding seat is controlled to move towards the sealing ring side through the adjusting member. The sliding seat drives the valve core, the overcurrent spring and the end cover to move towards the sealing ring side, so that the distance between the end face of the baffle and the sealing ring decreases. At this time, if the flow rate at the inlet end increases, the valve core is pressed in. Because the distance between the end face of the baffle and the sealing ring decreases, with the spring modulus unchanged, the overcurrent spring only needs a relatively small flow rate to achieve the fitting of the baffle and the sealing ring and close the valve. On the contrary, by controlling the sliding seat to move away from the sealing ring side through the adjusting member, the sliding seat and the valve core and the overcurrent spring move away from the sealing ring side, and the distance between the end face of the baffle and the sealing ring increases. At this time, if the flow rate at the inlet end increases, the valve core is pressed in. Because the distance between the end face of the baffle and the sealing ring increases, with the spring modulus unchanged, the overcurrent spring needs a relatively large flow rate to achieve the fitting of the baffle and the sealing ring and close the valve. Therefore, by controlling the sliding seat to approach or move away from the sealing ring through the adjusting member, the adjustment of the overcurrent threshold value can be realized.
[0007] Furthermore, the adjusting member is a flow regulating shaft, which is threadedly connected to the fixed seat. One end of the flow regulating shaft extends into the intake passage. The end of the flow regulating shaft located in the intake passage is hemispherical, frustum-shaped or conical. The end of the sliding seat away from the sealing ring is provided with a chamfer, and the end of the flow regulating shaft located in the intake passage abuts against the chamfer of the sliding seat. Through the setting of the flow regulating shaft, during the upward / downward movement, the sliding seat can be driven to move away from / towards the sealing ring side, thereby adjusting the flow threshold value of the overcurrent device and realizing the rapid adjustment of the flow threshold value.
[0008] Furthermore, an adjusting groove is provided at the end of the flow regulating shaft away from the intake passage. Through the setting of the adjusting groove, it is convenient to rotate the flow regulating shaft.
[0009] Furthermore, a groove is provided on the outer surface of the fixed seat, and a limiting cap is arranged in the groove. The end of the flow regulating shaft provided with the adjusting groove is located in the limiting cap. An adjusting hole is provided at the top of the limiting cap, and the adjusting hole is located directly above the flow regulating shaft. The flow regulating shaft extends into the adjusting hole; a threaded hole is provided at the bottom of the groove, and the threaded hole penetrates through the fixed seat and communicates with the intake passage. The diameter of the threaded hole is smaller than the diameter of the groove, and the flow regulating shaft is threadedly connected in the threaded hole. Through the setting of the limiting cap and the adjusting hole, the flow regulating shaft can be rotated through the adjusting hole, and the flow regulating shaft can be prevented from extending out of the limiting cap, avoiding gas leakage caused by the flow regulating shaft detaching from the fixed seat.
[0010] Furthermore, a sealing gasket is provided at the bottom of the groove, and the top of the sealing gasket abuts against the bottom of the limiting cap. Through the setting of the sealing gasket, it helps to further ensure the tightness of the connection between the flow regulating shaft and the fixed seat.
[0011] Further, the flow regulating shaft is larger at the top and smaller at the bottom. In the middle of the outer wall of the larger end of the flow regulating shaft, there is an annular groove. A sealing gasket is sleeved at the annular groove. The smaller end of the flow regulating shaft is threadedly connected in the threaded hole. The smaller end of the flow regulating shaft extends into the air inlet passage and abuts against the chamfer of the sliding seat. A circular adjusting block is integrally formed at the end of the flow regulating shaft away from the sliding seat. The diameter of the adjusting block is smaller than the diameter of the larger end of the flow regulating shaft. An adjusting groove is provided on the adjusting block.
[0012] Further, the end cover is threadedly connected to the connecting rod, which is convenient for the loading and unloading of the end cover.
[0013] Further, a fixing ring is integrally formed on the outer wall of the sealing ring. The aperture of the air outlet end of the air inlet passage is smaller than the outer diameter of the fixing ring. One side of the fixing ring is hermetically abutted against the inner wall of the air outlet end of the fixing seat. The end of the return spring away from the sliding seat abuts against the other side of the fixing ring. Through the setting of the fixing ring, it helps to improve the installation stability of the sealing ring, and further improve the sealing performance.
[0014] Further, an inner chamfer is provided at the air inlet end of the fixing seat, which is convenient for connecting with an external pipeline.
[0015] Further, the length of the return spring is 15 mm and the elastic coefficient is 6.9 g / mm; the length of the flow-through spring is 12 mm and the elastic coefficient is 0.2 g / mm.
[0016] Further, in the initial state, the baffle is 0.5 cm away from the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a perspective view of a flow rate adjustable flow-through device according to Embodiment 1 of the present utility model;
[0018] Figure 2 is Figure 1 an exploded view of;
[0019] Figure 3 is Figure 1 a longitudinal sectional view of. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] The following is further detailed through specific embodiments:
[0021] The reference numerals in the accompanying drawings of the specification include: fixing seat 1, sealing ring 2, return spring 3, valve core 4, sliding seat 5, flow-through spring 6, end cover 7, sealing gasket 8, flow regulating shaft 9, limit cap 10.
[0022] Embodiment 1 is basically as shown in the attached Figures 1 to 3As shown: A flow adjustable overcurrent device, including an adjustment component, a valve core 4, a sealing ring 2, a return spring 3, an overcurrent spring 6, a sliding seat 5, and a fixed seat 1 provided with an air intake passage. The air intake passage is a circular passage, and the aperture of the air outlet end of the air intake passage is smaller than that of the air inlet end. The inner wall of the air inlet end of the fixed seat 1 is provided with an expansion hole, and the side wall of the air inlet end of the expansion hole is provided with a chamfer for facilitating the installation of the pipeline.
[0023] A fixing ring is integrally formed on the outer wall of the sealing ring 2. One side of the fixing ring is hermetically abutted against the inner wall of the air outlet end of the fixed seat 1. One end of the return spring 3 abuts against the other side of the fixing ring, and the other end of the return spring 3 abuts against the sliding seat 5;
[0024] The sliding seat 5 is cylindrical. The sliding seat 5 is located inside the fixed seat 1 and has a clearance fit with it, and the clearance value is 0 - 0.04 mm. One end of the sliding seat 5 is open, and the outer wall of the open end of the sliding seat 5 is provided with a chamfer. The other end of the sliding seat 5 is evenly distributed with air intake holes for gas passage. A fixing column is provided at the center of the sliding seat 5. The fixing column and the sliding seat 5 are coaxial, and a guiding hole is provided at the center of the fixing column. The open end of the sliding seat 5 faces the expansion hole.
[0025] The valve core 4 includes a connecting rod, an end cap 7, and a circular baffle. The baffle is fixedly connected to the middle of the connecting rod. The end cap 7 is threadedly connected to one end of the connecting rod. The diameter of the baffle is larger than the outer diameter of the sealing ring 2. The end of the connecting rod away from the end cap 7 passes through and extends into the return spring 3. The baffle is located inside the return spring 3 and there is a gap between them, that is, the baffle does not contact the return spring 3. The end of the connecting rod connected with the end cap 7 passes through the guiding hole of the fixing column and is slidably connected to it. The sliding seat 5 is located between the end cap 7 and the baffle. The overcurrent spring 6 is sleeved on the connecting rod, and both ends of the overcurrent spring 6 respectively abut against the sliding seat 5 and the end cap 7. In the initial state, the distance between the baffle and the sealing ring 2 is 5 mm.
[0026] The regulating assembly includes a flow regulating shaft 9, a limiting cap 10 and a sealing gasket 8. A circular groove is provided on the top of the fixing seat 1, and a threaded hole is provided at the bottom of the groove. The threaded hole penetrates the upper wall of the fixing seat 1 and is connected to the air inlet channel, and the aperture of the threaded hole is smaller than the aperture of the groove; the flow regulating shaft 9 is larger at the top and smaller at the bottom, and an annular annular groove is provided in the middle of the outer wall of the larger end of the flow regulating shaft 9. The sealing gasket 8 is sleeved in the annular groove, and the smaller end of the flow regulating shaft 9 is conical and threadedly connected in the threaded hole. The smaller end of the flow regulating shaft 9 extends into the air inlet channel, and the flow regulating shaft 9 is located at one end in the air inlet channel. Resting on the chamfer of the sliding seat 5, a circular adjusting block is integrally formed at one end of the flow regulating shaft 9 away from the sliding seat 5, the diameter of the adjusting block is smaller than the diameter of the larger end of the flow regulating shaft 9, and a straight-line adjusting groove is provided on the adjusting block; the opening end of the limiting cap 10 faces downward, the opening of the opening end of the limiting cap 10 is circular and the diameter is equal to the outer diameter of the larger end of the flow regulating shaft 9, the adjusting block is located in the limiting cap 10, and the top of the limiting cap 10 is provided with an adjusting hole that is connected to the opening and coaxial with the adjusting hole, the aperture of the adjusting hole is smaller than the outer diameter of the larger end of the flow regulating shaft 9, and the adjusting hole is located directly above the flow regulating shaft 9.
[0027] The only difference between Example 2 and Example 1 is that the end of the flow regulating shaft 9 located in the air inlet passage is hemispherical.
[0028] The only difference between Example 3 and Example 1 is that no annular groove is set on the flow regulating shaft 9, the diameter of the regulating block is larger than the diameter of the flow regulating shaft 9, the sealing gasket 8 is set at the bottom of the groove, and the top of the sealing gasket 8 is against the bottom of the limiting cap 10.
[0029] In Examples 1 to 3, the length of the return spring 3 is 15 mm, and the elastic coefficient is 6.9 g / mm; the length of the overflow spring 6 is 12 mm, and the elastic coefficient is 0.2 g / mm.
[0030] Taking Example 1 as an example, the specific implementation process is as follows: Installation of the flow-adjustable flow device: the sealing ring 2 is fixed to the air outlet end of the fixed seat 1, the reset spring 3 is pressed in, one end of the reset spring 3 is close to the fixed ring of the sealing ring 2, the valve core 4, the sliding seat 5, the flow spring 6, and the end cover 7 are assembled as a whole and installed in the air inlet channel of the fixed seat 1, the flow regulating shaft 9 is connected to the fixed seat 1 through the threaded hole, the sealing gasket 8 is pressed into the groove, and the limit cap 10 is firmly connected to the fixed seat 1 through tight fitting and gluing, and does not fall off. The outer wall of one end of the flow regulating shaft 9, which is a right truncated cone, is against the chamfer of the sliding seat 5, and the end of the reset spring 3 away from the sealing ring 2 is against the sliding seat 5. After the flow-adjustable flow device is installed, the end of the fixed seat 1 with the sealing ring 2 is installed at the inlet end of the safety valve (such as a timing valve, an electric valve, a solenoid valve, etc.).
[0031] When it is necessary to reduce the threshold value of the over-current device, rotate the flow adjustment shaft 9 clockwise. The entire flow adjustment shaft 9 moves downward. The flow adjustment shaft 9 contacts the sliding seat 5, causing the entire sliding seat 5 to move toward the side close to the sealing ring 2. The distance between the end face of the baffle and the sealing ring 2 decreases. At this time, if the flow rate at the inlet end increases, the valve core 4 is pressed in. Because the distance between the end face of the baffle and the sealing ring 2 decreases, with the spring modulus unchanged, the compression amount required for the over-current spring 6 decreases. Only a relatively small flow rate is required to achieve the fitting of the valve core 4 and the sealing ring 2 and close the valve. On the contrary, rotate the flow adjustment shaft 9 counterclockwise. The entire flow adjustment shaft 9 moves upward. The flow adjustment shaft 9 contacts the sliding seat 5 through an inclined surface, causing the entire sliding seat 5 to move away from the side of the sealing ring 2. The distance between the end face of the baffle and the sealing ring 2 increases. At this time, if the flow rate at the inlet end increases, the valve core 4 is pressed in. Because the distance between the end face of the baffle and the sealing ring 2 increases, with the spring modulus unchanged, the compression amount required for the over-current spring 6 increases. Then a relatively large flow rate is required to achieve the fitting of the valve core 4 and the sealing ring 2 and close the valve.
[0032] Through the cooperation of the flow adjustment shaft 9, the sliding seat 5, the over-current spring 6, and the return spring 3, the over-current adjustable device realizes adjustable over-current value by the special surface contact between the flow adjustment shaft and the sliding seat 5.
[0033] The above are only the embodiments of the present invention. Common knowledge such as the specific structures and characteristics known in the solutions is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.
Claims
1. A flow-adjustable flow device, comprising a fixing seat provided with an air inlet passage, characterized in that: A sealing ring, a return spring, a valve core, a sliding seat, an overflow spring and an end cover are sequentially arranged in the air intake channel, the sealing ring is fixed at the air outlet end of the air intake channel, the return spring is located between the sealing ring and the sliding seat, and the two ends of the return spring are respectively abutted against the walls of the fixed seat and the sliding seat, the valve core comprises a connecting rod and a circular baffle fixedly connected to the connecting rod, the diameter of the baffle is larger than the outer diameter of the sealing ring, the sliding seat is evenly provided with air intake holes for gas to pass through, one end of the connecting rod passes through the sliding seat and is slidably connected thereto, the baffle is located in the return spring and there is a gap between the two; the end cover is fixedly connected to the end of the connecting rod away from the return spring, the overflow spring is sleeved on the connecting rod, and the two ends of the overflow spring are respectively abutted against the sliding seat and the end cover; the fixed seat is provided with an adjusting member for controlling the sliding seat to approach or move away from the sealing ring.
2. The flow-adjustable flow device according to claim 1, characterized in that: The adjusting part is a flow adjusting shaft, which is threadedly connected to the fixed seat. One end of the flow adjusting shaft extends into the air inlet channel. The end of the flow adjusting shaft located in the air inlet channel is hemispherical, truncated cone or conical. The end of the sliding seat away from the sealing ring is provided with a chamfer, and the end of the flow adjusting shaft located in the air inlet channel is abutted against the chamfer of the sliding seat.
3. The flow-adjustable flow device according to claim 2, characterized in that: An adjusting groove is arranged at one end of the flow adjusting shaft away from the air inlet passage.
4. The flow-adjustable flow device according to claim 3, characterized in that: The outer surface of the fixed seat is provided with a groove, and a limiting cap is provided in the groove. The end of the flow regulating shaft provided with an adjustment groove is located in the limiting cap, and an adjustment hole is provided on the top of the limiting cap. The adjustment hole is located directly above the flow regulating shaft, and the flow regulating shaft extends into the adjustment hole; a threaded hole is provided at the bottom of the groove, and the threaded hole passes through the fixed seat and is connected with the air inlet channel. The aperture of the threaded hole is smaller than the aperture of the groove, and the flow regulating shaft is threadedly connected in the threaded hole.
5. The flow-adjustable flow device according to claim 4, characterized in that: A sealing gasket is arranged at the bottom of the groove, and the top of the sealing gasket abuts against the bottom of the limiting cap.
6. The flow-adjustable flow device according to claim 4, characterized in that: The flow regulating shaft is larger at the top and smaller at the bottom. An annular groove is provided in the middle of the outer wall of the larger end of the flow regulating shaft, and a sealing gasket is sleeved on the annular groove. The smaller end of the flow regulating shaft is threadedly connected to the threaded hole. The smaller end of the flow regulating shaft extends into the air inlet channel and abuts against the chamfer of the sliding seat. A circular regulating block is integrally formed at the end of the flow regulating shaft away from the sliding seat. The diameter of the regulating block is smaller than the diameter of the larger end of the flow regulating shaft, and the regulating groove is provided on the regulating block.
7. A flow-adjustable flow device according to any one of claims 1 to 6, characterized in that: The end cover is threadedly connected to the connecting rod.
8. The flow-adjustable flow device according to claim 7, characterized in that: A fixing ring is integrally formed on the outer wall of the sealing ring, the aperture of the air outlet end of the air inlet channel is smaller than the outer diameter of the fixing ring, one side of the fixing ring is airtightly abutted against the inner wall of the air outlet end of the fixing seat, and the end of the return spring away from the sliding seat is abutted against the other side of the fixing ring.
9. The flow-adjustable flow device according to claim 8, characterized in that: The length of the return spring is 15 mm, and the elastic coefficient is 6.9 g / mm; the length of the overflow spring is 12 mm, and the elastic coefficient is 0.2 g / mm.
10. The flow-adjustable flow device according to claim 9, characterized in that: In the initial state, the baffle is 0.5 cm away from the sealing ring.