Miniature safety valve

Abstract

The miniature safety valve comprises a valve body, a cavity is formed in the middle of the valve body, a sealing column capable of moving along the axis of the sealing column is arranged in the cavity, an air channel is formed in the bottom of the valve body, and a sealing ring is arranged at an outlet of the air channel. Limiting columns capable of moving along the axis of the valve body are arranged on the side portion of the valve body, each limiting column is matched with a fine adjustment knob, the fine adjustment knob abuts against the limiting column through a compression spring, the contact position of the limiting column and the sealing column is an inclined face, the limiting columns are perpendicular to the sealing column and used for limiting the sealing column, and the bottom of the sealing column is matched with the sealing ring to form a sealing structure. And the limiting columns are used for sealing the air channel, and the number of the limiting columns is at least two. The utility model provides a miniature safety valve which is a medical miniature safety valve which is provided with a mechanical structure, does not need electric control and can release air pressure to a safety value, and solves the problems that the existing safety valve with a mechanical structure cannot release the air pressure to the safety value and an electromagnetic safety valve can release the air pressure to the safety value but needs electric control.

Description

Technical Field

[0001] This utility model relates to a miniature safety valve. Background Technology

[0002] Intermittent pressure devices are used in various fields, including circulatory system diseases, postoperative rehabilitation, elderly care, and athlete rehabilitation. Based on a deep understanding of blood circulation, this technology applies gradually increasing and decreasing air pressure to the patient's limbs through intermittent inflation and deflation of a cuff, simulating the body's natural blood flow process to promote blood circulation and reduce edema. To prevent excessive air pressure caused by continuous inflation during malfunctions, which could endanger patient safety, a miniature safety valve is used for depressurization.

[0003] Existing miniature safety valves are generally divided into two categories: mechanical and gas. Mechanical safety valves, such as the utility model patent CN219994471U, disclose a ball-type check valve. This valve consists of a spring, valve core, and rubber ring. When the inlet pressure is less than the spring force, the valve core presses tightly against the rubber ring, preventing pressure release. When the inlet pressure exceeds the spring force, the valve core opens, releasing pressure. The disadvantage of mechanical safety valves is their inability to quickly release pressure to a safe level. When equipment malfunctions, the air bladder is continuously inflated. After reaching the opening threshold, the force on the valve core exceeds the spring's counterforce, causing the valve core to gradually open. As the valve core moves, the spring force gradually increases, while the gas force gradually decreases, eventually reaching equilibrium. However, because the valve core still has momentum, it continues to open, then decelerates. When the valve core speed drops to zero, the valve core reaches its maximum position, then accelerates in the opposite direction, reaching a point of equilibrium at some point, and then continues to move until its speed is zero again, reaching its minimum position. The valve core then accelerates open again under the action of the resultant force, repeating this process several times until it finally reaches equilibrium. Therefore, this safety valve must not be depressurized to the safe value. Because the spring compression at final stability is greater than the initial spring compression, the final stable air pressure value is greater than the safety valve opening threshold.

[0004] Another type is the electromagnetic safety valve. For example, the utility model patent with publication number CN212529612U discloses an electromagnetic normally closed valve and an electrically controlled brake valve. It requires electrical control. Taking the normally closed electromagnetic valve as an example, the safety valve is tightly closed when not energized, and opens and releases pressure when energized. For electromagnetic safety valves, the opening and closing of the valve needs to be electrically controlled. The disadvantage is that there is a risk of failure due to power failure or microcontroller control failure. Summary of the Invention

[0005] This invention proposes a miniature safety valve, which is a medical miniature safety valve with a mechanical structure, requiring no electrical control, and capable of releasing air pressure to a safe value. It solves the problems of existing mechanical safety valves being unable to release pressure to a safe value and electromagnetic safety valves, although capable of releasing pressure to a safe value, requiring electrical control.

[0006] The technical solution of this utility model to solve the above problems is:

[0007] This utility model proposes a miniature safety valve, which is special in that:

[0008] It includes a valve body, a cavity in the middle of the valve body, a sealing column that can move along its own axis inside the cavity, an air passage at the bottom of the valve body, and a sealing ring at the outlet of the air passage.

[0009] The valve body has a limit post on its side that can move along its own axis. Each limit post is equipped with a fine adjustment knob, which is in contact with the limit post by a compression spring. The contact point between the limit post and the sealing post is an inclined surface. The limit post and the sealing post are perpendicular to each other. The limit post is used to limit the sealing post. The bottom of the sealing post cooperates with the sealing ring to form a sealing structure for sealing the air passage. There are at least two limit posts.

[0010] By using a limit post, compression spring, and fine-tuning knob, adjusting the fine-tuning knob changes the spring compression, thereby altering the force between the limit post and the inclined surface of the sealing post, and thus changing the opening threshold of the safety valve. The cooperation between the sealing post and the limit post ensures that when the gas pressure is below the safety valve's opening threshold, the sealing post is restrained by the limit post, the safety valve remains sealed, and normal equipment operation is not affected. When the gas pressure exceeds the safety valve's opening threshold, the sealing post pushes open the limit post and disengages from the valve body, creating a large pressure relief space and rapidly releasing pressure to a safe value, without requiring electrical control.

[0011] Furthermore, the fine-tuning knob is threadedly connected to the valve body, enabling adjustment of the fine-tuning knob.

[0012] Furthermore, the fine-tuning knob is provided with a guide rod, and a compression spring is sleeved on the guide rod.

[0013] Furthermore, the limiting post is provided with a retaining ring, and the valve body sidewall is provided with a through hole. One end of the limiting post extends into the through hole, and the diameter of the retaining ring is larger than the diameter of the through hole.

[0014] Furthermore, the bottom of the sealing column is a conical surface, which, together with the sealing ring, forms a sealing structure for sealing the air passage.

[0015] Furthermore, the top of the sealing post is a conical surface, which contacts the inclined surface at the end of the limiting post.

[0016] Furthermore, the number of the limiting posts is two, and the two limiting posts are arranged symmetrically.

[0017] Furthermore, the number of the limiting posts appears in pairs, for example, there are two pairs of limiting posts, and each pair of limiting posts is symmetrically arranged.

[0018] Furthermore, a guide sleeve is provided inside the cavity of the valve body, and the sealing column moves axially along the guide sleeve.

[0019] Furthermore, the airway outlet is provided with a groove, and a sealing ring is disposed in the groove, with the sealing ring in a fixed position.

[0020] Advantages of this utility model:

[0021] 1) By using the limit post, spring, and fine adjustment knob in combination, the fine adjustment knob can be adjusted to change the spring compression (spring force), thereby changing the force between the inclined surfaces of the limit post and the sealing post, thus changing the opening threshold of the safety valve and making it suitable for scenarios with different pressure threshold requirements.

[0022] 2) Through the cooperation of the sealing column and the limiting column, when the gas pressure is less than the opening threshold of the safety valve, the sealing column is restricted by the limiting column, the safety valve is sealed, and the normal operation of the equipment is not affected; when the gas pressure is greater than the opening threshold of the safety valve, the sealing column pushes open the limiting column and detaches from the valve body, forming a large pressure relief space, and quickly depressurizes to a safe value, without the need for electrical control.

[0023] 3) This utility model has a simple structure, small size, and significant pressure relief effect. It does not require electrical control and solves the problems of existing mechanical safety valves being unable to relieve pressure to a safe value and only being able to keep the air pressure stable above the opening threshold, and electromagnetic safety valves being able to relieve pressure to a safe value but requiring electrical control and thus posing certain risks. Attached Figure Description

[0024] Figure 1 This is a front view of the structure of a miniature safety valve;

[0025] Figure 2 This is a force analysis diagram between the limiting post and the sealing post;

[0026] Figure 3 This is a force analysis diagram between the limiting column and the sealing column;

[0027] Figure 4 This is a diagram of the pressure relief process of a miniature safety valve;

[0028] Figure 5 This is a top view of the structure of a miniature safety valve;

[0029] Figure 6 This is a perspective view of the pressure relief process of a miniature safety valve;

[0030] In the diagram, 1 is the valve body; 2 is the sealing column; 3 is the sealing ring; 4 is the limit column; 5 is the fine-tuning knob; 6 is the compression spring; 7 is the guide rod; 8 is the retaining ring; and 9 is the air passage. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0032] See Figure 1 A miniature safety valve includes a valve body 1 with a cavity in the middle. Inside the cavity is a sealing post 2 that can move along its own axis. An air passage 9 is located at the bottom of the valve body 1. The lower end of the sealing post 2 faces the outlet of the air passage 9, and a sealing ring 3 is fixedly installed at the outlet of the air passage 9. The bottom of the sealing post 2 and the sealing ring 3 cooperate to form a sealing structure for sealing the air passage 9. A limiting post 4 that can move along its own axis is located on the side of the valve body 1, perpendicular to the side wall of the valve body 1. Each limiting post 4 is equipped with a fine-tuning knob 5, which abuts against the limiting post 4 via a compression spring 6, providing a preload force to the limiting post 4. This preload force can be adjusted by adjusting the fine-tuning knob 5. The contact point between the limiting post 4 and the sealing post 2 is an inclined surface, and the limiting post 4 is perpendicular to the sealing post 2. The limiting post 4 is used to limit the axial movement of the sealing post 2. At least two limiting posts 4 are used.

[0033] See Figure 4 and Figure 6 The safety valve operates by using a limit post, a compression spring, and a fine-tuning knob. Adjusting the knob changes the spring compression, altering the force between the limit post and the inclined surfaces of the sealing post, thus changing the valve's opening threshold. The combination of the sealing post and the limit post ensures that when the gas pressure is below the safety valve's opening threshold, the sealing post is restrained by the limit post, sealing the valve and preventing disruption to normal equipment operation. When the gas pressure exceeds the threshold, the sealing post pushes open the limit post and detaches from the valve body, creating a large pressure relief space and rapidly releasing pressure to a safe level without requiring electrical control.

[0034] The miniature safety valve provided by this utility model functions through the cooperation of a limiting post and a sealing post. By adjusting the fine-tuning knob, the spring force can be changed, thereby altering the forces on the inclined surfaces of the limiting post and the sealing post. Force analysis is as follows: Figure 2 Ignoring gravity, FN is the vertical pressure received on the inclined surface of the sealing column, u is the coefficient of friction, and f is the frictional force. The force distribution in the direction perpendicular to the air inlet is as follows: Figure 3 As shown, the total force exerted on the sealing column by the two limiting columns is 2*F_resultant. When the intake pressure is less than 2*F_resultant, the sealing column is restricted by the limiting columns, and the safety valve is sealed; when the intake pressure is greater than 2*F_resultant, the sealing column pushes open the limiting columns and detaches from the valve body, forming a large pressure relief space, quickly releasing pressure to a safe value. The pressure relief effect is significant, effectively preventing patient injury.

[0035] Specifically, see Figure 6 The fine-tuning knob 5 is connected to the valve body 1 by a thread. By rotating the fine-tuning knob 5, the adjustment of the fine-tuning knob 5 can be realized, changing the spring compression and spring force, changing the force between the inclined surfaces of the limit post and the sealing post, thereby changing the opening threshold of the safety valve.

[0036] As a preferred embodiment of this utility model, see [link to relevant documentation]. Figure 1 The fine-tuning knob 5 is provided with a guide rod 7, and the compression spring 6 is sleeved on the guide rod 7. The guide rod 7 guides the compression spring 6.

[0037] As a preferred embodiment of this utility model, see [link to relevant documentation]. Figure 1 The limiting post 4 is provided with a retaining ring 8, and the side wall of the valve body 1 is provided with a through hole. One end of the limiting post 4 extends into the through hole. The diameter of the retaining ring 8 is larger than the diameter of the through hole. When the limiting post 4 moves along the through hole and abuts against the sealing post, the retaining ring 8 limits the limiting post 4.

[0038] As a preferred embodiment of this utility model, see [link to relevant documentation]. Figure 6 The bottom of the sealing column 2 is a conical surface, which cooperates with the sealing ring 3 to form a sealing structure for sealing the gas passage 9. The top of the sealing column 2 is also a conical surface, which contacts the inclined surface at the end of the limiting column 4. The angle of the inclined surface of the limiting column and the angle of the conical surface of the sealing column are complementary. When the gas pressure does not reach the safety valve opening threshold, the limiting column effectively restricts the position of the sealing column, and the safety valve is sealed. When the gas reaches the safety valve opening threshold, the sealing column moves outward along the inclined surface of the limiting column and eventually detaches from the valve body, quickly releasing pressure. This allows the safety valve to quickly release pressure to a safe value without being electrically controlled.

[0039] As a preferred embodiment of this utility model, see [link to relevant documentation]. Figure 5The number of limiting posts 4 is two, and the two limiting posts 4 are symmetrically arranged. Specifically, the number of limiting posts 4 can appear in pairs, and each pair of limiting posts 4 is symmetrically arranged.

[0040] In a preferred embodiment of the present invention, a guide sleeve (not shown in the figure) is provided in the cavity of the valve body 1. The guide sleeve is fixed inside the valve body 1, and the middle part of the sealing column 2 passes through the guide sleeve, so that the sealing column 2 can move axially along the guide sleeve.

[0041] In a preferred embodiment of this utility model, the outlet of the air passage 9 is provided with a groove (not shown in the figure), and the sealing ring 3 is disposed in the groove and the position of the sealing ring 3 is fixed.

[0042] In summary, this invention provides a miniature safety valve with a mechanical structure that requires no electrical control and can release gas pressure to a safe value. It incorporates a fine-tuning knob, a spring, and a limiting post to provide pressure and friction to the sealing column, ensuring that the sealing column is tightly pressed against the sealing ring before the gas reaches the opening threshold, preventing pressure leakage. Once the gas reaches the opening threshold, the sealing column moves and pushes open the limiting post, finally detaching from the limiting post and disengaging from the valve body for rapid pressure release. This solves the problems of mechanical safety valves failing to release pressure to a safe value and electromagnetic safety valves requiring electrical control, although they can release pressure to a safe value. Therefore, this invention effectively protects patient safety, avoiding the risks posed by mechanical safety valves that cannot completely release pressure, and eliminating concerns about electrical control failure. When the safety valve opens, the sealing column 2 detaches from the valve body 1 and pops out. The fine-tuning knob 5 can be adjusted outwards to move the limiting post 4 outwards. The sealing column 2 can then be reinstalled back into the valve body 1, and the fine-tuning knob 5 can be adjusted again to lock the sealing column 2 in place, thus enabling reuse.

[0043] The above description is merely an embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related system fields, are similarly included within the scope of protection of this utility model.

Claims

1. A miniature safety valve, characterized in that: It includes a valve body (1), a cavity in the middle of the valve body (1), a sealing column (2) that can move along its own axis inside the cavity, an air passage (9) at the bottom of the valve body (1), and a sealing ring (3) at the outlet of the air passage (9). The valve body (1) is provided with a limiting post (4) on its side that can move along its own axis. Each limiting post (4) is equipped with a fine adjustment knob (5), which abuts against the limiting post (4) through a compression spring (6). The contact point between the limiting post (4) and the sealing post (2) is an inclined surface. The limiting post (4) is perpendicular to the sealing post (2). The limiting post (4) is used to limit the sealing post (2). The bottom of the sealing post (2) cooperates with the sealing ring (3) to form a sealing structure for sealing the air passage (9). The number of limiting posts (4) is at least two.

2. A miniature safety valve according to claim 1, characterized in that: The fine adjustment knob (5) is threadedly connected to the valve body (1), which can realize the adjustment of the fine adjustment knob (5).

3. A miniature safety valve according to claim 2, characterized in that: The fine-tuning knob (5) is provided with a guide rod (7), and a compression spring (6) is sleeved on the guide rod (7).

4. A miniature safety valve according to claim 3, characterized in that: The limiting post (4) is provided with a retaining ring (8), and the valve body (1) has a through hole on its side wall. One end of the limiting post (4) extends into the through hole, and the diameter of the retaining ring (8) is larger than the diameter of the through hole.

5. A miniature safety valve according to claim 4, characterized in that: The bottom of the sealing column (2) is a conical surface, which cooperates with the sealing ring (3) to form a sealing structure for sealing the air passage (9).

6. A miniature safety valve according to claim 5, characterized in that: The top of the sealing post (2) is a conical surface, which contacts the inclined surface at the end of the limiting post (4).

7. A miniature safety valve according to claim 6, characterized in that: The number of the limiting posts (4) is two, and the two limiting posts (4) are symmetrically arranged.

8. A miniature safety valve according to claim 7, characterized in that: The number of the limiting posts (4) appears in pairs, and each pair of limiting posts (4) is symmetrically arranged.

9. A miniature safety valve according to claim 8, characterized in that: The valve body (1) is provided with a guide sleeve in its cavity, and the sealing column (2) moves axially along the guide sleeve.

10. A miniature safety valve according to claim 9, characterized in that: The outlet of the air passage (9) is provided with a slot, and the sealing ring (3) is set in the slot and the position of the sealing ring (3) is fixed.

Images