Pediatric breathing machine air supply mechanism with automatic compensation and pressure maintenance

Abstract

The present application relates to the technical field of medical apparatus and instruments, in particular to a pediatric breathing machine gas supply mechanism with automatic compensation and pressure maintenance, which comprises a machine body, a first piston, a second piston and a pressure relief valve, a first chamber, a second chamber and a third chamber are respectively arranged in the machine body, the first piston and the second piston are respectively slidably arranged in the second chamber and the third chamber, the pressure relief valve is fixedly arranged on the machine body and communicates with the first chamber, a self-adaptive compensation assembly that cooperates with the first piston and the second piston is arranged in the machine body, and the self-adaptive compensation assembly is connected with the pressure relief valve through a transmission structure, through the cooperation of the first piston, the second piston, the self-adaptive compensation assembly, the pressure relief valve and the transmission structure, the capacity of the first chamber is expanded, the excess oxygen is discharged in time, the harm caused by the continuous increase of pressure to the patient is effectively avoided, and the self-adaptive compensation assembly can quickly drive the first piston and the second piston to approach each other, so that the capacity of the first chamber is quickly reduced to restore the pressure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a pediatric breathing machine gas supply mechanism with automatic compensation and pressure maintenance. BACKGROUND

[0002] In the field of pediatric medicine, breathing machines as an important auxiliary treatment equipment are widely used in the respiratory support treatment of newborns, infants and children. Due to the significant differences between the physiological characteristics of pediatric patients and adults, their respiratory systems are relatively fragile, and the inspiratory volume is low, so they have more stringent requirements for the gas supply pressure and stability of the breathing machine. However, the existing breathing machine gas supply mechanism has many deficiencies when dealing with pediatric patients, and needs to be improved.

[0003] Pediatric patients, especially newborns and infants, have not fully developed respiratory systems, small lung capacity, high respiratory rate, and low inspiratory volume. This makes it necessary to have higher requirements for the stability and adjustment accuracy of the gas supply pressure when using a breathing machine. If the gas supply pressure is too high, it may cause damage to the lungs of the child, causing serious complications such as pulmonary emphysema and pneumothorax; while if the pressure is too low, it cannot meet the respiratory needs of the child, leading to difficulty breathing and affecting treatment effectiveness. In addition, the pressure change during the breathing process of pediatric patients has certain regularity: pressure increase is usually continuous, while pressure decrease is usually temporary. Therefore, the breathing machine gas supply mechanism needs to accurately identify and adapt to this pressure change feature, and timely compensate and adjust to ensure the stability and safety of the gas supply.

[0004] At present, most breathing machine gas supply mechanisms use a single pressure adjustment method, which maintains the stability of the gas supply pressure through manual or simple automatic control systems. However, these systems often cannot achieve accurate pressure adjustment when dealing with the low inspiratory volume and special pressure change regularity of pediatric patients. Manual adjustment relies on the experience and real-time monitoring of medical personnel, which is not only cumbersome to operate, but also prone to inaccurate adjustment due to human factors. While the simple automatic control system can automatically adjust the pressure to some extent, its adjustment accuracy and response speed are limited, making it difficult to meet the high requirements of pediatric patients for pressure stability.

[0005] The existing breathing machine gas supply mechanism lacks effective adaptive compensation mechanisms when facing pressure changes. When the pressure in the first chamber increases continuously due to the low inspiratory volume of pediatric patients, it cannot maintain the stability of the pressure by automatically expanding the chamber volume or discharging excess oxygen. This results in a continuous increase in pressure, which may cause damage to the lungs of the child. Similarly, when the pressure is temporarily reduced, it also cannot quickly restore the pressure, affecting the respiratory support effect of the child. This gas supply mechanism lacking adaptive compensation function has a great safety hazard in pediatric respiratory treatment. SUMMARY

[0006] The purpose of the present application is to provide an automatic compensation pressure maintaining pediatric respirator gas supply mechanism to solve the problems raised in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] An automatic compensation pressure maintaining pediatric respirator gas supply mechanism, comprising a body, a first piston, a second piston and a pressure relief valve, wherein the body is internally provided with a first chamber, a second chamber and a third chamber, the two ends of the first chamber are respectively communicated with the second chamber and the third chamber;

[0009] The first piston and the second piston are respectively slidably arranged in the second chamber and the third chamber, the pressure relief valve is fixedly arranged on the body and communicated with the first chamber, and the pressure relief valve is in a closed state;

[0010] Further comprising an air inlet head and an air outlet head fixedly arranged on the body, one end of the air inlet head is communicated with the first chamber, and the other end is used for being communicated with a respirator; one end of the air outlet head is communicated with the first chamber through an air passage formed in the body, and the other end is used for being communicated with a trachea for patient inhalation;

[0011] The body is provided with an adaptive compensation assembly, the adaptive compensation assembly is matched with the first piston and the second piston, when the pressure in the first chamber increases, the first piston will slide in the second chamber away from the first chamber under the action of the pressure, in this process, the adaptive compensation assembly will drive the second piston to slide in the third chamber away from the first chamber, thereby expanding the capacity of the first chamber, on the contrary, when the pressure in the first chamber decreases, the first piston and the second piston will approach each other;

[0012] The adaptive compensation assembly is connected with the pressure relief valve through a transmission structure, in the process that the first piston slides away from the first chamber, the transmission structure will drive the pressure relief valve to open, thereby discharging the oxygen in the first chamber.

[0013] As a further scheme of the present application: the adaptive compensation assembly comprises a rectangular rod, a first spring and a second spring, the rectangular rod is slidably arranged in the body;

[0014] One end of the rectangular rod is fixedly connected with one end of the first piston close to the second piston, under the action of the rectangular rod, the first piston can only slide and cannot rotate.

[0015] As a further further scheme of the present application: the first spring and the second spring are respectively located on both sides of the first piston, and the two ends of the first spring and the second spring are respectively abutted with the two ends of the first piston and the two ends of the second chamber.

[0016] Under the action of the first spring and the second spring, the first piston will be in a central position in the second chamber.

[0017] As a further further scheme of the present application: the self-adaptive compensation assembly further comprises a lead screw and a threaded sleeve, the lead screw is rotationally arranged in the third chamber, and the threaded sleeve is coaxially and fixedly arranged at the center of the second piston and threadedly matched with the outer wall of the lead screw.

[0018] Wherein, the second piston can only slide in the third chamber and cannot rotate, so when the lead screw rotates, the second piston will slide in the third chamber.

[0019] As a further further scheme of the present application: the end of the lead screw close to the first piston is coaxially and fixedly provided with a rotating rod, and the outer wall of the rotating rod is slidably sleeved with a collar.

[0020] The collar is fixedly connected with the other end of the rectangular rod through a plurality of connecting rods, and when the first piston slides, the rectangular rod will drive the collar to slide on the outer wall of the rotating rod through the plurality of connecting rods.

[0021] As a further further scheme of the present application: a spiral groove is formed in the outer wall of the rotating rod along the length direction of the rotating rod, a plurality of rolling balls are rollingly embedded in the inner wall of the collar, and the rolling balls are also rollingly embedded in the spiral groove.

[0022] As a further further scheme of the present application: the transmission structure comprises a gear ring, the gear ring is rotationally arranged in the interior of the second chamber, and the gear ring is also coaxially sleeved on the outer wall of the first piston.

[0023] An arc-shaped groove is formed in the outer wall of the first piston along the length direction of the first piston, a plurality of steel balls are rollingly embedded in the inner wall of the gear ring, and the steel balls are also rollingly embedded in the arc-shaped groove.

[0024] As a further further scheme of the present application: a transmission rod is rotationally arranged on the machine body, one end of the transmission rod is coaxially and fixedly provided with a first gear, and the first gear is intermeshed with the gear ring.

[0025] As a further further scheme of the present application: the other end of the transmission rod is coaxially and fixedly provided with a second gear, the adjusting rod of the pressure relief valve is coaxially and fixedly provided with a third gear, and the second gear and the third gear are intermeshed.

[0026] Compared with the prior art, the present application has the beneficial effects of:

[0027] Since the pediatric patient has a low inhalation volume, the pressure increase in the first chamber is usually continuous, at which time the mechanism can expand the capacity of the first chamber by cooperation of the first piston and the second piston, and timely discharge the excess oxygen by cooperation of the self-adaptive compensation assembly, the pressure relief valve and the transmission structure, effectively avoiding the continuous pressure increase from causing harm to the patient, providing continuous and stable breathing support for the pediatric patient, and avoiding breathing discomfort caused by pressure fluctuations;

[0028] When the pressure in the first chamber decreases, which is usually temporary, the self-adaptive compensation assembly of the mechanism can quickly drive the first piston and the second piston to approach each other, rapidly reducing the capacity of the first chamber to restore the pressure, and at the same time, the transmission structure connected thereto can timely control the opening and closing of the pressure relief valve, avoiding the waste of oxygen caused by the temporary pressure decrease. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Overall structure schematic diagram of an embodiment of the automatic compensation pressure maintaining pediatric respirator gas supply mechanism.

[0030] Figure 2 Cutaway view of the mechanism body, gas inlet head and gas outlet head in an embodiment of the automatic compensation pressure maintaining pediatric respirator gas supply mechanism.

[0031] Figure 3 For Figure 2 Enlarged view of A in the middle.

[0032] Figure 4 For Figure 2 Enlarged view of B in the middle.

[0033] Figure 5 Overall structure half cutaway schematic diagram of an embodiment of the automatic compensation pressure maintaining pediatric respirator gas supply mechanism.

[0034] Figure 6 For Figure 2 On the basis of the collar and the gear ring cutaway view.

[0035] Figure 7 For Figure 6 Enlarged view of C in the middle.

[0036] Figure 8 For Figure 6 Enlarged view of D in the middle.

[0037] In the figure: 1, body; 101, No. 1 chamber; 102, No. 2 chamber; 103, No. 3 chamber; 104, air passage; 2, No. 1 piston; 201, arc-shaped groove; 3, No. 2 piston; 4, pressure relief valve; 5, air inlet head; 6, air outlet head; 7, rectangular rod; 8, No. 1 spring; 9, No. 2 spring; 10, screw rod; 11, threaded sleeve; 12, rotating rod; 1201, helical groove; 13, sleeve ring; 14, connecting rod; 15, ball; 16, gear ring; 17, steel ball; 18, transmission rod; 19, No. 1 gear; 20, No. 2 gear; 21, No. 3 gear. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0039] In addition, the elements in the present application are referred to as "fixed to" or "disposed on" another element, which can be directly on another element or can have a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or can have a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0040] Please refer to Figures 1-8 In the embodiments of the present application, an automatic compensation pressure maintaining pediatric respirator gas supply mechanism includes a body 1, a No. 1 piston 2, a No. 2 piston 3 and a pressure relief valve 4. The body 1 has a No. 1 chamber 101, a No. 2 chamber 102 and a No. 3 chamber 103 arranged therein. The two ends of the No. 1 chamber 101 are in communication with the No. 2 chamber 102 and the No. 3 chamber 103, respectively.

[0041] The No. 1 piston 2 and the No. 2 piston 3 are slidingly arranged in the No. 2 chamber 102 and the No. 3 chamber 103, respectively. The pressure relief valve 4 is fixedly arranged on the body 1 and in communication with the No. 1 chamber 101. The pressure relief valve 4 is in a closed state.

[0042] The automatic compensation pressure maintaining pediatric respirator gas supply mechanism further includes an air inlet head 5 and an air outlet head 6 fixedly arranged on the body 1, respectively. One end of the air inlet head 5 is in communication with the No. 1 chamber 101, and the other end is used to communicate with a respirator. One end of the air outlet head 6 is in communication with the No. 1 chamber 101 through an air passage 104 formed in the body 1, and the other end is used to communicate with a trachea for a patient to inhale air.

[0043] The body 1 is provided with an adaptive compensation assembly which cooperates with the first piston 2 and the second piston 3, when the pressure in the first chamber 101 increases, the first piston 2 will slide in the second chamber 102 away from the first chamber 101, in this process, the adaptive compensation assembly will drive the second piston 3 to slide in the third chamber 103 away from the first chamber 101, so as to expand the capacity of the first chamber 101, on the contrary, when the pressure in the first chamber 101 decreases, the first piston 2 and the second piston 3 will approach each other.

[0044] The adaptive compensation assembly is connected with the pressure relief valve 4 through a transmission structure, in the process that the first piston 2 slides away from the first chamber 101, the transmission structure will drive the pressure relief valve 4 to open, so as to discharge the oxygen in the first chamber 101.

[0045] In this scheme, the intake head 5 continuously introduces breathing machine gas, so that the first chamber 101 becomes a high pressure reference chamber, the pediatric patient has small inhalation volume, the gas accumulation rate in the first chamber 101 is greater than the discharge rate, the pressure is first established in the first chamber 101 and continuously increases;

[0046] The increased pressure directly acts on the end surface of the first piston 2, and pushes it to slide to the far end of the second chamber 102; at the same time, the adaptive compensation assembly synchronously transmits the linear displacement to the second piston 3 in the third chamber 103, so that the second piston 3 also slides to the far end, the two pistons move in opposite directions, the axial length of the first chamber 101 is instantaneously lengthened, the chamber volume is increased, and part of the rising slope of the pressure is offset, so that soft suppression is realized;

[0047] When the pressure continues to rise and reaches a set threshold, the stroke of the first piston 2 just triggers the transmission structure, which converts the mechanical displacement into the opening force of the pressure relief valve 4; the valve core is opened, the excess oxygen is accurately discharged, the pressure is prevented from further rising, a hard upper limit protection is formed, and the discharge only occurs at the end of the piston stroke, so that continuous gas leakage is avoided;

[0048] At the moment of patient inhalation, the pressure in the first chamber 101 appears a temporary decrease, the pneumatic force acting on the two pistons decreases; the pre-tightened elastic element (or gas back pressure) pushes the pistons to move reversely, the volume of the first chamber 101 is reduced, the pressure is quickly restored to the working interval, the pressure relief valve 4 is closed due to the reset of the transmission structure, the exhaust is stopped, the oxygen waste is prevented, the whole cycle is periodically repeated with the breathing beat of the child, and an automatic compensation pressure maintaining process of "capacity expansion slow rise-partial pressure relief high limit-volume reduction fast compensation" is realized.

[0049] Please refer to Figure 3 and Figure 5The self-adaptive compensation assembly comprises a rectangular rod 7, a first spring 8 and a second spring 9, the rectangular rod 7 is slidingly arranged in the machine body 1;

[0050] One end of the rectangular rod 7 is fixedly connected with the first piston 2 close to one end of the second piston 3, under the action of the rectangular rod 7, the first piston 2 can only slide and cannot rotate;

[0051] The first spring 8 and the second spring 9 are respectively located on both sides of the first piston 2, and both ends of the first spring 8 and the second spring 9 are respectively abutted with both ends of the first piston 2 and both ends of the second chamber 102;

[0052] Under the action of the first spring 8 and the second spring 9, the first piston 2 will be in a position in the middle of the second chamber 102.

[0053] In this embodiment, the rectangular rod 7 and the wall surface of the machine body 1 form a moving pair, the axis of which is parallel to the axis of the second chamber 102; the rod end is rigidly fixed to the end surface of the first piston 2, so that the first piston 2 can only slide along the axial direction, the rotational degree of freedom is completely eliminated, the circumferential wear of the piston sealing ring is uniform, and the transmission direction is constant;

[0054] When the pressure in the first chamber 101 increases and the first piston 2 slides outward, the rectangular rod 7 is synchronously extended as a rigid connection, and the displacement amount is transmitted to the subsequent transmission link without lag, so that the mechanical interlocking of volume compensation and safety relief is realized;

[0055] The first spring 8 and the second spring 9 are respectively arranged on both sides of the first piston 2, and the pre-compression amounts are equal; in the static state, the forces of the two springs are equal in size and opposite in direction, the resultant force is zero, and the first piston 2 is locked at the geometric center position of the second chamber 102;

[0056] When the pressure changes and breaks the balance:

[0057] The pressure increases, the first piston 2 moves outward, the second spring 9 is further compressed, the first spring 8 is stretched, the synthetic restoring force linearly increases, and once the pressure and the force are rebalanced, the first piston 2 stops at a new position, the volume of the first chamber 101 increases, and the compensation is completed;

[0058] The pressure decreases, the reverse restoring force dominates, the first piston 2 is retracted under the joint action of the two springs, and the volume decreases, and the pressure quickly rises;

[0059] The first piston 2 is always subjected to the action of the center-symmetric spring force, so no matter which side it deviates, the system can provide a non-discriminatory return tendency, ensuring that the next cycle starts from the central position, and realizing the real "self-adaptive compensation-automatic reset" closed loop.

[0060] Please refer to Figure 4And Figure 7 The adaptive compensation assembly further comprises a screw rod 10 and a threaded sleeve 11, the screw rod 10 is rotationally arranged in the third cavity 103, and the threaded sleeve 11 is coaxially and fixedly arranged at the center of the second piston 3 and is in threaded cooperation with the outer wall of the screw rod 10;

[0061] The second piston 3 can only slide in the third cavity 103 and cannot rotate, so when the screw rod 10 rotates, the second piston 3 will slide in the third cavity 103;

[0062] The end of the screw rod 10 close to the first piston 2 is coaxially and fixedly provided with a rotating rod 12, and the outer wall of the rotating rod 12 is slidably sleeved with a sleeve ring 13;

[0063] The sleeve ring 13 is fixedly connected with the other end of the rectangular rod 7 through a plurality of connecting rods 14, when the first piston 2 slides, the rectangular rod 7 will drive the sleeve ring 13 to slide on the outer wall of the rotating rod 12 through the plurality of connecting rods 14;

[0064] The outer wall of the rotating rod 12 is provided with a spiral groove 1201 along the length direction, and the inner wall of the sleeve ring 13 is rollingly embedded with a ball 15, and the ball 15 is also rollingly embedded in the spiral groove 1201.

[0065] In this embodiment, when the pressure of the first cavity 101 changes, the first piston 2 drives the rectangular rod 7 to linearly slide along the axis of the second cavity 102; the plurality of connecting rods 14 at the end of the rectangular rod 7 rigidly transmit the same direction displacement to the sleeve ring 13, forcing the sleeve ring 13 to make pure linear sliding (without rotation) on the outer wall of the rotating rod 12;

[0066] The ball 15 in the inner wall of the sleeve ring 13 is constrained in the spiral groove 1201 of the rotating rod 12; since the sleeve ring 13 can only move linearly, the ball 15 becomes the rolling body in the "nut-screw rod", and the linear motion of the sleeve ring 13 is forcibly converted into the rotary motion of the rotating rod 12 - the rise angle of the spiral groove 1201 determines the rotation direction and angular displacement; thus, each linear stroke of the first piston 2 is accurately "coded" as the rotation angle of the rotating rod 12;

[0067] The rotating rod 12 is coaxially and fixedly connected with the screw rod 10, and the screw rod 10 synchronously rotates; the second piston 3 can only axially slide due to the anti-rotation structure of the third cavity 103; the screw rod 10 and the threaded sleeve 11 form a rotary-linear conversion pair, and the above angular displacement is converted into the axial displacement of the second piston 3 again, and the displacement direction is opposite to that of the first piston 2:

[0068] The outward movement of the first piston 2 (the volume increases), the forward rotation of the rotating rod 12, the outward movement of the second piston 3 driven by the screw rod 10, and the further expansion of the volume of the first cavity 101, realize "two-stage compensation".

[0069] When the first piston 2 moves outward (volume decreases), the rotating rod 12 rotates reversely, and the second piston 3 moves inward synchronously, so that the pressure is rapidly recovered.

[0070] Please refer to Figure 4 , Figure 7 and Figure 8 , the transmission structure comprises a gear ring 16, which is rotationally arranged inside the second chamber 102, and the gear ring 16 is also coaxially arranged on the outer wall of the first piston 2.

[0071] The outer wall of the first piston 2 is provided with an arc-shaped groove 201 along the length direction, the inner wall of the gear ring 16 is rollingly fitted with a steel ball 17, and the steel ball 17 is also rollingly fitted in the arc-shaped groove 201.

[0072] The machine body 1 is rotationally arranged with a transmission rod 18, one end of the transmission rod 18 is coaxially fixedly arranged with a first gear 19, and the first gear 19 is in mesh with the gear ring 16.

[0073] The other end of the transmission rod 18 is coaxially fixedly arranged with a second gear 20, and the adjusting rod of the pressure relief valve 4 is coaxially fixedly arranged with a third gear 21, and the second gear 20 and the third gear 21 are in mesh with each other.

[0074] In this embodiment, the outer wall of the first piston 2 is provided with an axial arc-shaped groove 201; the gear ring 16 is rotationally arranged inside the second chamber 102, the inner wall of the gear ring 16 is rollingly fitted with a steel ball 17, and the steel ball 17 is also rollingly fitted in the arc-shaped groove 201; when the first piston 2 is linearly moved outward under the action of the gas pressure, the groove wall of the arc-shaped groove 201 pushes the steel ball 17, so that the gear ring 16 rotates around its own axis-the linear displacement of the piston is accurately converted into the rotation angle of the gear ring 16.

[0075] The gear ring 16 is in mesh with the first gear 19, so that the torque is transmitted to the transmission rod 18; the other end of the transmission rod 18 is fixedly arranged with the second gear 20, so that the speed reduction and direction conversion of the gear ring 16, the first gear 19 and the second gear 20 are realized, the torque is amplified and the rotation plane is changed, so as to provide sufficient opening torque for the pressure relief valve 4;

[0076] The second gear 20 is directly in mesh with the third gear 21 (fixedly connected to the adjusting rod of the pressure relief valve 4); when the first piston 2 moves outward to the set stroke, the third gear 21 drives the valve rod to rotate, the pressure relief valve 4 is gradually opened from the normally closed state, and the excess oxygen is discharged; when the first piston 2 returns, the gears rotate reversely, the valve rod returns to the original position, the valve is closed again, and the exhaust is stopped.

[0077] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0078] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description is made in this way only for the sake of clarity, and a person skilled in the art should consider the description as a whole, and the technical solutions in each embodiment can also be combined appropriately to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A pediatric respirator gas supply mechanism with automatic compensation and pressure maintenance, comprising a body (1), a first piston (2), a second piston (3) and a pressure relief valve (4), characterized in that, The inner part of the machine body (1) is respectively provided with a first chamber (101), a second chamber (102) and a third chamber (103), both ends of the first chamber (101) are respectively communicated with the second chamber (102) and the third chamber (103); The first piston (2) and the second piston (3) are respectively slidably arranged in the second chamber (102) and the third chamber (103), the pressure relief valve (4) is fixedly arranged on the machine body (1) and communicated with the first chamber (101), and the pressure relief valve (4) is in a closed state; It also includes an air inlet head (5) and an air outlet head (6) which are respectively fixedly arranged on the machine body (1), one end of the air inlet head (5) is communicated with the first chamber (101), and the other end is used for being communicated with a breathing machine; one end of the air outlet head (6) is communicated with the first chamber (101) through an air passage (104) arranged in the machine body (1), and the other end is used for being communicated with a trachea for a patient to inhale air; The machine body (1) is provided with an adaptive compensation assembly, the adaptive compensation assembly comprises a rectangular rod (7), a first spring (8) and a second spring (9), and the rectangular rod (7) is slidably arranged in the machine body (1); One end of the rectangular rod (7) is fixedly connected with the first piston (2) close to one end of the second piston (3); The first spring (8) and the second spring (9) are respectively located on both sides of the first piston (2), and both ends of the first spring (8) and the second spring (9) are respectively abutted with both ends of the first piston (2) and both ends of the second chamber (102); The adaptive compensation assembly further comprises a lead screw (10) and a threaded sleeve (11), the lead screw (10) is rotatably arranged in the third chamber (103), and the threaded sleeve (11) is coaxially fixedly arranged at the center of the second piston (3) and threadedly matched with the outer wall of the lead screw (10); One end of the lead screw (10) close to the first piston (2) is coaxially fixedly provided with a rotating rod (12), and the outer wall of the rotating rod (12) slidably sleeved with a sleeve ring (13); The sleeve ring (13) is fixedly connected with the other end of the rectangular rod (7) through a plurality of connecting rods (14); When the pressure in the first chamber (101) increases, the first piston (2) will slide in the second chamber (102) away from the first chamber (101) under the action of the pressure; In this process, the rectangular rod (7) drives the sleeve ring (13) to slide on the outer wall of the rotating rod (12) through a plurality of connecting rods (14), drives the rotating rod (12) and the lead screw (10) to rotate synchronously, and drives the second piston (3) to slide in the third chamber (103) away from the first chamber (101), so as to expand the capacity of the first chamber (101), and vice versa, when the pressure in the first chamber (101) decreases, the first piston (2) and the second piston (3) will approach each other. The first piston (2) is connected with the pressure relief valve (4) through a transmission structure, and in the process that the first piston (2) slides away from the first chamber (101), the transmission structure drives the pressure relief valve (4) to open, thereby discharging oxygen in the first chamber (101).

2. The pediatric respirator gas supply mechanism of claim 1, wherein, Under the action of the rectangular rod (7), the first piston (2) can only slide and cannot rotate.

3. The pediatric respirator gas supply mechanism of claim 2, wherein, Under the action of the first spring (8) and the second spring (9), the first piston (2) will be in a central position in the second chamber (102).

4. The pediatric respirator gas supply mechanism of claim 2, wherein, The second piston (3) can only slide in the third chamber (103) and cannot rotate, so when the lead screw (10) rotates, the second piston (3) will slide in the third chamber (103).

5. The pediatric respirator gas supply mechanism of claim 4, wherein, The outer wall of the rotating rod (12) is provided with a spiral groove (1201) along the length direction, the inner wall of the sleeve ring (13) is rollingly embedded with a ball (15), and the ball (15) is also rollingly embedded in the spiral groove (1201).

6. The pediatric respirator gas supply mechanism of claim 1, wherein, The transmission structure comprises a gear ring (16), the gear ring (16) is rotationally arranged in the second chamber (102), and the gear ring (16) is also coaxially arranged on the outer wall of the first piston (2). The outer wall of the first piston (2) is provided with an arc-shaped groove (201) along the length direction, the inner wall of the gear ring (16) is rollingly embedded with a steel ball (17), and the steel ball (17) is also rollingly embedded in the arc-shaped groove (201).

7. The pediatric respirator gas supply mechanism of claim 6, wherein, The transmission rod (18) is rotationally arranged on the machine body (1), one end of the transmission rod (18) is coaxially fixedly arranged with a first gear (19), and the first gear (19) is in meshing engagement with the gear ring (16).

8. The pediatric respirator gas supply mechanism of claim 7, wherein, The other end of the transmission rod (18) is coaxially fixedly arranged with a second gear (20), the adjusting rod of the pressure relief valve (4) is coaxially fixedly arranged with a third gear (21), and the second gear (20) and the third gear (21) are in meshing engagement.

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