Ventilation structure of refrigerant recovery machine

Abstract

The present utility model relates to the technical field of refrigerant recovery, and in particular to a ventilation structure of a refrigerant recovery machine. In order to overcome the defect that springs of air inlet valves and / or air outlet valves of existing refrigerant recovery machines are impacted by liquid refrigerants and are thus lack of protection, the present utility model uses the following technical solution: the ventilation structure of the refrigerant recovery machine comprises a valve seat provided with an air hole, a valve core axially moving relative to the air hole, a compression spring mounted on the valve core, and a protective assembly arranged on the valve seat, wherein the protective assembly has an annular wall, the annular wall surrounds the compression spring, the compression spring is spaced apart from the valve seat by a distance, and the area, located between the compression spring and the valve seat, of the protective assembly forms a radial ventilation channel. The ventilation structure of the refrigerant recovery machine of the present utility model has the beneficial effect of reducing or avoiding impact of a liquid refrigerant in a radially arriving airflow on the compression spring.

Description

Refrigerant recovery machine ventilation structure Technical Field

[0001] The utility model belongs to the technical field of refrigerant recovery, and in particular relates to a ventilation structure of a refrigerant recovery machine. Background Art

[0002] A Chinese utility model, with authorization publication number CN217422205U, discloses an air intake valve for a refrigerant recovery machine, comprising: a valve seat defining an air intake hole; a valve core axially movable within the air intake hole, with a mounting slot defined at one end of the valve core distal from the air intake hole; a first elastic member mounted within the mounting slot; a second elastic member abutting the first elastic member; a flat washer abutting the circular member; and a compression spring abutting the valve seat and the flat washer, respectively. In this utility model, the addition of the elastic member absorbs some energy through deformation, reducing the force exerted on the first elastic member and making it less susceptible to breakage or loosening.

[0003] However, the above-mentioned utility model solution still has the following problems: 1. The liquid refrigerant in the air flow will cause radial impact on the spring, causing the spring to be in a skewed state. At this time, reciprocating motion will increase the risk of spring breakage; 2. The stroke of the spring is not restricted. The greater the load, the greater the stroke of the spring, which is prone to insufficient fatigue strength, resulting in spring breakage; 3. A conical spring is used. During the compression process of the spring, as the pitch becomes smaller, the air intake of the valve seat inlet decreases accordingly. At the same time, the gap between the conical spring and the valve core is also larger, and the radial deflection of the conical spring is large; 4. After the spring breaks, the movement of the valve core loses the guiding effect of the spring. Due to the long stroke, the valve core will become skewed, and the valve core rod will collide with the valve seat. After multiple collisions, the valve core will deform, causing the entire ventilation structure to fail, and eventually causing the compressor to jam.

[0004] At the same time, the outlet valve of the refrigerant recovery machine also has similar problems: 1. Liquid refrigerant will cause radial impact on the spring; 2. The valve core is not guided or the guiding effect is poor or difficult to guarantee; 3. After the spring breaks, the broken spring steel wire enters the internal channel, affecting the life of the compressor.

[0005] Summary of the Invention

[0006] This utility model addresses the problem of the springs of existing refrigerant recovery machines being impacted by liquid refrigerant and lacking protection. By providing a ventilation structure for the refrigerant recovery machine, the utility model protects the springs, thereby preventing or reducing the impact of liquid refrigerant on the springs, and thus preventing or reducing spring failure and the adverse consequences thereof. Furthermore, the utility model guides the springs, reducing or preventing spring deflection, and limits the spring travel, thereby extending the spring life.

[0007] To achieve the above purpose, the present invention adopts the following technical solution: the ventilation structure of the refrigerant recovery machine includes:

[0008] Valve seat, with air holes;

[0009] A valve core is axially movable relative to the air hole;

[0010] A compression spring mounted on the valve core;

[0011] A protective component, disposed on the valve seat;

[0012] The protection component has an annular wall, which surrounds the compression spring. The compression spring is a distance away from the valve seat. The area of ​​the protection component located between the compression spring and the valve seat forms a radial ventilation channel.

[0013] The ventilation structure of the refrigerant recovery machine of the present invention has a protective component, which has an annular wall. The annular wall surrounds the compression spring, and the annular wall reduces or avoids the impact of liquid refrigerant in the radial airflow on the compression spring; the compression spring is a certain distance away from the valve seat, and the protective component is located in the area between the compression spring and the valve seat to form a radial ventilation channel. All or part of the liquid refrigerant will reach the ventilation channel along the outer wall of the annular wall with the air flow, and reach the air hole through the ventilation channel, thereby avoiding or reducing the impact of the liquid refrigerant on the compression spring through the compression spring.

[0014] As an improvement, the protection component has a guide portion for guiding the middle portion of the valve core, and the compression spring is further away from the air hole than the guide portion.

[0015] As an improvement, the ventilation structure of the refrigerant recovery machine includes an air intake structure, and the air intake structure includes:

[0016] The valve seat is provided with an air inlet hole;

[0017] An air intake valve core is axially movable relative to the air intake hole;

[0018] an abutment assembly, mounted on an end of the intake valve core away from the intake hole;

[0019] an air intake protection assembly, disposed on the valve seat;

[0020] An air intake spring is sleeved outside the air intake valve core and abuts against the air intake protection component and the abutment component respectively;

[0021] The intake protection assembly has an intake annular wall, which surrounds the intake spring. The intake spring is a distance away from the valve seat. The area of ​​the intake protection assembly between the intake spring and the valve seat forms an intake channel.

[0022] As an improvement, the projections of the abutment assembly and the intake protection assembly in the axial direction at least partially overlap, so as to limit the compression degree of the intake spring;

[0023] A limiting groove is provided on a side of the abutting component facing the valve seat, and one end of the air intake spring is matched with the limiting groove.

[0024] As an improvement, the intake protection assembly further forms a guiding inclined surface, a limiting portion, a supporting portion, and an intake guide portion for guiding the intake valve core, the intake spring abuts against the supporting portion, and the limiting portion limits the radial direction of the intake spring;

[0025] The radial gap between the intake annular wall and the intake spring is smaller than the radial gap between the intake spring and the intake valve core;

[0026] The upper end of the air intake annular wall extends radially outward to form a convex ring.

[0027] As an improvement, the air intake protection assembly includes a bracket and a spring seat fixedly connected to each other, the bracket is installed on the valve seat, the air intake annular wall is formed on the spring seat, and the bracket is hollowed to form the air intake channel.

[0028] As an improvement, the bracket includes a first annular portion, a second annular portion and a plurality of columns therebetween, the air inlet channel being formed between the plurality of columns, an annular convex portion being formed at the air inlet hole of the valve seat, the first annular portion being sleeved outside the annular convex portion, and the diameter of the outer circle formed by the plurality of columns being smaller than that of the first annular portion and forming a step;

[0029] An annular groove is formed outside the annular protrusion of the valve seat, and the height of the first annular portion is adapted to the depth of the annular groove.

[0030] As an improvement, the lower end of the spring seat forms the intake guide portion, the intake guide portion is inserted into the second annular portion, the intake guide portion is clearance-matched with the intake valve core, and the second annular portion supports the spring seat;

[0031] The air intake spring is a cylindrical spring;

[0032] The abutting assembly includes a first elastic member, a second elastic member and a top ring, and the top ring is provided with the limiting groove.

[0033] As an improvement, the ventilation structure of the refrigerant recovery machine includes an air outlet structure, and the air outlet structure includes:

[0034] The valve seat is provided with an air outlet;

[0035] The outlet valve core A moves axially relative to the outlet hole;

[0036] An air outlet protection assembly is provided on the valve seat and has an air outlet guide portion for guiding the air outlet valve core A;

[0037] An air outlet spring A is provided on the air outlet valve core A and abuts against the air outlet protection component and the air outlet valve core A respectively;

[0038] The air outlet protection assembly has an air outlet annular wall, which surrounds the air outlet spring A. The air outlet spring A is a distance away from the valve seat. The area of ​​the air outlet protection assembly located between the air outlet spring A and the valve seat forms an air outlet channel.

[0039] As an improvement, the air outlet protection assembly includes an air outlet protection sleeve and a positioning pin, the air outlet protection sleeve is fixed to the valve seat through the positioning pin, and one end of the air outlet protection sleeve close to the air outlet hole is hollowed out to form the air outlet channel;

[0040] The air outlet protective sleeve has a cylindrical portion, a reinforcement portion and an opening portion. One end of the air outlet spring A abuts against the cylindrical portion, and the cylindrical portion forms the air outlet annular wall; the cylindrical portion is clearance-matched with the air outlet valve core A.

[0041] The beneficial effects of the ventilation structure of the refrigerant recovery machine of the present invention are: it has a protective component, the protective component has an annular wall, the annular wall surrounds the compression spring, the annular wall reduces or avoids the impact of the liquid refrigerant in the radial airflow on the compression spring; the compression spring is a certain distance away from the valve seat, and the protective component is located in the area between the compression spring and the valve seat to form a radial ventilation channel, all or part of the liquid refrigerant will reach the ventilation channel along the outer wall of the annular wall with the air flow, and reach the air hole through the ventilation channel, thereby avoiding or reducing the impact of the liquid refrigerant on the compression spring through the compression spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG1 is a schematic diagram of the three-dimensional structure of the air intake structure of the ventilation structure of the refrigerant recovery machine according to the first embodiment of the present invention.

[0043] FIG2 is a cross-sectional view of the air intake structure of the ventilation structure of the refrigerant recovery machine according to the first embodiment of the present invention.

[0044] FIG3 is a structural exploded view of the air intake structure of the ventilation structure of the refrigerant recovery machine according to the first embodiment of the present invention.

[0045] FIG4 is a structural diagram of a valve seat of an air intake structure of a ventilation structure of a refrigerant recovery machine according to a first embodiment of the present invention.

[0046] FIG5 is a structural diagram of a valve core of an air intake structure of a ventilation structure of a refrigerant recovery machine according to a first embodiment of the present invention.

[0047] FIG6 is a structural diagram of a bracket of a protective assembly of an air intake structure of a ventilation structure of a refrigerant recovery machine according to a first embodiment of the present invention.

[0048] 7 and 8 are structural schematic diagrams at different angles of the spring seat of the protective assembly of the air intake structure of the ventilation structure of the refrigerant recovery machine according to the first embodiment of the present invention.

[0049] FIG9 is a cross-sectional view of the air intake structure of the ventilation structure of the refrigerant recovery machine according to the first embodiment of the present invention (compared to FIG2 , the cylinder head is also shown).

[0050] FIG10 is a schematic diagram of the three-dimensional structure of the air outlet structure of the ventilation structure of the refrigerant recovery machine according to the second embodiment of the present invention.

[0051] FIG11 is a cross-sectional view of the air outlet structure of the ventilation structure of the refrigerant recovery machine according to the second embodiment of the present invention.

[0052] FIG12 is a structural exploded view of the air outlet structure of the ventilation structure of the refrigerant recovery machine according to the first embodiment of the present invention.

[0053] FIG13 is a schematic structural diagram of an air outlet protective cover of an air outlet structure of a ventilation structure of a refrigerant recovery machine according to a first embodiment of the present invention.

[0054] FIG14 is a cross-sectional view of the air outlet structure of the ventilation structure of the refrigerant recovery machine according to the first embodiment of the present invention (compared to FIG10 , the cylinder head is also shown).

[0055] In the figure, 1, valve seat; 11, air inlet; 12, annular convex portion; 13, annular groove; 14, air outlet;

[0056] 2. Intake valve core;

[0057] 3. a first elastic member;

[0058] 4. a second elastic member;

[0059] 5. Top ring; 51. Limiting groove;

[0060] 6. Intake protection assembly; 61. Bracket; 611. First annular portion; 612. Second annular portion; 613. Column portion; 62. Spring seat; 621. Intake annular wall; 622. Guide slope; 623. Positioning portion; 624. Support portion; 625. Intake guide portion; 626. Protruding ring;

[0061] 7. Intake spring;

[0062] 2A, outlet valve core;

[0063] 6A, air outlet protection assembly; 63, air outlet protection sleeve; 631, cylindrical portion; 632, reinforcement portion; 633, opening portion; 64, positioning pin;

[0064] 7A, air outlet spring;

[0065] 8. Cylinder head.

[0066] DETAILED DESCRIPTION

[0067] The technical solutions of the embodiments of the present invention are explained and described below, but the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0068] 1 to 14 , the ventilation structure of the refrigerant recovery machine includes:

[0069] Valve seat, with air holes;

[0070] A valve core is axially movable relative to the air hole;

[0071] A compression spring is sleeved outside the valve core;

[0072] A protective component, disposed on the valve seat;

[0073] The protection component has a guide portion for guiding the middle portion of the valve core, and the compression spring is further away from the air hole than the guide portion.

[0074] The ventilation structure of the refrigerant recovery machine of the present invention is provided with a protective component on the valve seat. The protective component has a guide part for guiding the valve core. The protective component guides the middle part of the valve core to prevent or avoid deflection of the valve core. The protective component is arranged on the valve seat, and the air hole is also opened on the valve seat, so that the coaxiality of the protective component and the valve core is easier to ensure, thereby ensuring the guiding effect.

[0075] Example 1

[0076] 1 to 14 , the ventilation structure of the refrigerant recovery machine according to the first embodiment of the present invention includes an air inlet structure and an air outlet structure.

[0077] 1 to 9 , the air intake structure of the ventilation structure of the refrigerant recovery machine according to the first embodiment of the present invention includes:

[0078] The valve seat 1 is provided with an air inlet hole 11;

[0079] An air intake valve core 2 is axially movably disposed in the air intake hole 11, and a mounting groove is defined at one end of the air intake valve core 2 away from the valve seat 1;

[0080] A first elastic member 3 is installed in the installation groove;

[0081] A top ring 5 is sleeved outside the intake valve core 2 and is closer to the valve seat 1 than the first elastic member 3;

[0082] The second elastic member 4 is located between the first elastic member 3 and the top ring 5;

[0083] An air intake protection component 6 is provided on the valve seat 1;

[0084] An intake spring 7 is sleeved outside the intake valve core 2 and abuts against the intake protection assembly 6 and the top ring 5 respectively;

[0085] The air intake protection assembly 6 has a guide portion for guiding the air intake valve core 2;

[0086] The air intake protection assembly 6 has an air intake annular wall 621 , and the air intake annular wall 621 surrounds the air intake spring 7 .

[0087] In this embodiment, the air intake annular wall 621 only surrounds a portion of the air intake spring 7 .

[0088] Referring to Figure 2 , in this embodiment, the top ring 5 has a retaining groove 51 on the side facing the valve seat 1. One end of the intake spring 7 engages with this retaining groove 51. The retaining groove 51 limits the radial displacement of the intake spring 7. Typically, the retaining groove 51 is slightly tight with the intake spring 7. The retaining groove 51 has rounded corners to facilitate the entry of the intake spring 7. The depth of the retaining groove 51 is slightly greater than the wire diameter of the intake spring 7.

[0089] Referring to Figures 2 and 7 , in this embodiment, the inner side of the intake guard assembly 6 further includes a guide slope 622, a stopper 623, and a support 624. The intake spring 7 abuts against the support 624, and the stopper 623 limits the radial direction of the intake spring 7. Typically, the stopper 623 is slightly tight against the intake spring 7. The height of the stopper 623 is slightly greater than the wire diameter of the intake spring 7.

[0090] 2 , in this embodiment, the radial gap between the intake annular wall 621 and the intake spring 7 is smaller than the radial gap between the intake spring 7 and the intake valve core 2 , thereby avoiding or reducing friction between the intake spring 7 and the intake valve core 2 .

[0091] Referring to Figure 2 , in this embodiment, the axial projections of the lower end of the top ring 5 and the upper end of the intake guard assembly 6 at least partially overlap. The intake spring 7 is compressed to its maximum extent when the intake annular wall 621 contacts the top ring 5. The upper end of the intake annular wall 621 extends radially outward to form a raised ring 626. The top ring 5 and intake guard assembly 6 limit the maximum travel of the intake valve core 2, thereby limiting the maximum compression of the intake spring 7 and improving its service life. The raised ring 626 increases the contact area between the intake guard assembly 6 and the top ring 5.

[0092] Referring to Figures 2, 4, and 6 to 8, in this embodiment, the intake guard assembly 6 comprises a fixed bracket 61 and a spring seat 62. The bracket 61 is fixed to the valve seat 1, and the intake annular wall 621 is formed on the spring seat 62. The bracket 61 is hollowed out to form an intake passage. The intake guard assembly 6 is assembled from the bracket 61 and spring seat 62, making it relatively easy to manufacture. In other embodiments, the intake guard assembly can also be a single, integral component.

[0093] In this embodiment, the bracket 61 includes a first annular portion 611 , a second annular portion 612 , and a plurality of columnar portions 613 therebetween. The air inlet passage is formed between the plurality of columnar portions 613 .

[0094] In this embodiment, an annular protrusion 12 is formed at the air inlet 11 of the valve seat 1, and the first annular portion 611 is sleeved outside the annular protrusion 12. The diameter of the outer circle formed by the multiple columnar portions 613 is smaller than the first annular portion 611 and forms a step; an annular groove 13 is also formed outside the annular protrusion 12 of the valve seat 1, and the height of the first annular portion 611 is adapted to the depth of the annular groove 13.

[0095] In this embodiment, an air intake guide portion 625 is formed at the lower end of the spring seat 62 , and the air intake guide portion 625 is inserted into the second annular portion 612 . The air intake guide portion 625 is clearance-matched with the air intake valve core 2 ; the second annular portion 612 supports the spring seat 62 .

[0096] 2 and 5 , the intake valve core 2 comprises a conical portion, a cylindrical portion and a transition portion that cooperate with the intake hole 11 of the valve seat 1 , and a mounting groove is provided on the cylindrical portion.

[0097] Referring to Figure 9, the ventilation structure is used in a compressor. The compressor comprises a cylinder body (not shown) and a cylinder head 8. The cylinder body and cylinder head are fixedly connected, abutting against the valve seat 1. The cylinder body and cylinder head secure the valve seat 1 and bracket 61, thereby preventing bracket 61 from tilting. When the valve seat 1 is fixed, an axial gap exists between the column portion 613 of the bracket 61 and the annular protrusion 12 of the valve seat 1. An airflow channel is formed in the cylinder head 8.

[0098] In this embodiment, the intake spring 7 is a cylindrical spring. Due to the presence of the intake guard assembly 6, the spring seat 62 of the intake guard assembly 6 is elevated, and the entire spring seat 62 corresponds to the cylindrical portion of the intake valve core 2. Therefore, a cylindrical spring can be used. Compared to conical coil springs, cylindrical springs (cylindrical helical intake springs with a circular cross-section) have less radial deflection, a linear characteristic curve, stable stiffness, a simple structure, and are easy to manufacture.

[0099] In this embodiment, an intake protection assembly 6 having an intake annular wall 621 is provided, and the intake channel is located in the area between the intake spring 7 and the valve seat 1, so that the air flow path completely or partially avoids the intake spring 7, thereby avoiding or preventing the intake spring 7 from being impacted by the liquid refrigerant.

[0100] The beneficial effects of the air intake structure of the ventilation structure of the refrigerant recovery machine of the first embodiment of the present invention are as follows: an air intake protection component 6 is provided, and the air intake protection component 6 has an air intake annular wall 621 surrounding the lower part of the air intake spring 7. The air intake annular wall 621 avoids or reduces the impact of the liquid refrigerant on the spring, thereby reducing the risk of failure of the air intake spring 7; the air intake protection component 6 limits the maximum compression degree of the air intake spring 7, thereby increasing the service life of the air intake spring 7; the air intake spring 7 adopts a cylindrical spring with a small radial deflection; the air intake protection component 6 A radial air intake channel is formed between the multiple columns 613 of the bracket 61, which blocks or reduces the air flow through the air intake spring 7, avoids or reduces the impact on the air intake spring 7, and the degree of compression of the air intake spring 7 does not affect the air intake volume; the radial displacement of both ends of the air intake spring 7 is limited by the top ring 5 and the spring seat 62; even if the air intake spring 7 fails, due to the setting of the air intake guide portion 625 of the spring seat 62, the air intake valve core 2 will hardly be skewed, thereby preventing or reducing the collision between the air intake valve core 2 and the valve seat 1; the air intake path is short.

[0101] In other embodiments, the air intake structure may also be in the following form: the inner diameter of the annular wall of the spring seat is made larger than the outer diameters of the top ring, the first elastic member, and the second elastic member, and the height of the annular wall is increased, so that the top ring, the first elastic member, and the second elastic member can enter the spring seat, further preventing or reducing the impact of liquid refrigerant on the compression spring. At this time, the limiting effect of the spring seat and the top ring on the stroke of the compression spring disappears.

[0102] 10 to 14 , the air outlet structure of the ventilation structure of the refrigerant recovery machine according to the first embodiment of the present invention includes:

[0103] The valve seat 1 is provided with an air outlet 14;

[0104] The outlet valve core 2A is axially movable relative to the outlet hole 14;

[0105] An outlet protection assembly 6A is provided on the valve seat 1 and has an outlet guide portion for guiding the outlet valve core 2A;

[0106] An air outlet spring 7A is sleeved outside the air outlet valve core 2A and abuts against the air outlet protection component 6A and the air outlet valve core 2A respectively;

[0107] The outlet protection assembly 6A has an outlet guide portion for guiding the outlet valve core 2A.

[0108] The air outlet protection assembly 6A has an air outlet annular wall, and the air outlet annular wall surrounds the air outlet spring 7A.

[0109] In this embodiment, the outlet protection assembly 6A includes an outlet protection sleeve 63 and a positioning pin 64. The outlet protection sleeve 63 is fixed to the valve seat 1 through the positioning pin 64. The outlet protection sleeve 63 forms an outlet channel at one end close to the outlet hole 14.

[0110] In this embodiment, the air outlet protective sleeve 63 has a cylindrical portion 631, a reinforcement portion 632 and an opening portion 633. One end of the air outlet spring 7A abuts against the cylindrical portion 631. The cylindrical portion 631 forms the air outlet annular wall. There are two opening portions 633 and two positioning pins 64.

[0111] In this embodiment, the air outlet valve core 2A includes a conical portion and a stepped shaft portion located in the air outlet hole 14, the stepped shaft portion has a large diameter section and a small diameter section, the air outlet spring 7A is sleeved on the small diameter section and abuts against the large diameter section, and the cylindrical portion 631 guides the large diameter section of the stepped shaft portion.

[0112] In this embodiment, an air inlet 11 and an air outlet 14 are provided on the same valve seat 1 of the ventilation structure.

[0113] The beneficial effects of the air outlet structure of the ventilation structure of the refrigerant recovery machine of the first embodiment of the present invention are: the air outlet protective component 6A guides the air outlet valve core 2A; the air outlet protective component 6A protects the air outlet spring 7A to prevent the entire air outlet spring 7A from being impacted by the liquid refrigerant, and the air outlet spring 7A is not easy to be damaged and has a long service life; the air outlet protective component 6A wraps the air outlet spring 7A inside, and the protective effect is good; the air outlet protective component 6A forms an air outlet channel near one end of the valve seat 1; the air outlet protective component 6A is installed on the valve seat 1, and the coaxiality of the air outlet valve core 2A and the air outlet protective sleeve 63 of the air outlet protective component 6A is easy to ensure, thereby ensuring the guiding effect.

[0114] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. The ventilation structure of the refrigerant recovery machine is characterized by: The refrigerant recovery machine ventilation structure comprises: The valve seat (1) is provided with an air hole; The valve core moves axially relative to the air hole; A compression spring mounted on the valve core; A protective component, arranged on the valve seat (1); The protective component has an annular wall, the annular wall surrounds the compression spring, the compression spring is a distance away from the valve seat (1), and the area of ​​the protective component located between the compression spring and the valve seat (1) forms a radial ventilation channel.

2. The ventilation structure of the refrigerant recovery machine according to claim 1, characterized in that: The protection component has a guide portion for guiding the middle portion of the valve core, and the compression spring is farther away from the air hole than the guide portion.

3. The ventilation structure of the refrigerant recovery machine according to claim 1 or 2, characterized in that: The ventilation structure of the refrigerant recovery machine includes an air intake structure, and the air intake structure includes: The valve seat (1) is provided with an air inlet hole (11); An air intake valve core (2) is axially movable relative to the air intake hole (11); An abutment assembly, mounted on an end of the intake valve core (2) away from the intake hole (11); An air intake protection component (6) is arranged on the valve seat (1); An air intake spring (7) is sleeved outside the air intake valve core (2) and abuts against the air intake protection component (6) and the abutment component respectively; The air intake protection component (6) has an air intake annular wall (621), the air intake annular wall (621) surrounds the air intake spring (7), the air intake spring (7) is at a distance from the valve seat (1), and the area of ​​the air intake protection component (6) located between the air intake spring (7) and the valve seat (1) forms an air intake channel.

4. The ventilation structure of the refrigerant recovery machine according to claim 3, characterized in that: The projections of the abutment assembly and the intake protection assembly (6) in the axial direction at least partially overlap, so as to limit the degree of compression of the intake spring (7); A limiting groove (51) is provided on a side of the abutment component facing the valve seat (1), and one end of the air intake spring (7) cooperates with the limiting groove (51).

5. The ventilation structure of the refrigerant recovery machine according to claim 3, characterized in that: The air intake protection assembly (6) further forms a guiding inclined surface (622), a limiting portion (623), a supporting portion (624), and an air intake guiding portion (625) for guiding the air intake valve core (2); the air intake spring (7) abuts against the supporting portion (624), and the limiting portion (623) limits the radial direction of the air intake spring (7); The radial gap between the intake annular wall (621) and the intake spring (7) is smaller than the radial gap between the intake spring (7) and the intake valve core (2); The upper end of the air intake annular wall (621) extends radially outward to form a convex ring (626).

6. The ventilation structure of the refrigerant recovery machine according to claim 5, characterized in that: The air intake protection assembly (6) comprises a bracket (61) and a spring seat (62) which are fixedly connected to each other, the bracket (61) is mounted on the valve seat (1), the air intake annular wall (621) is formed on the spring seat (62), and the bracket (61) is hollowed out to form the air intake passage.

7. The ventilation structure of the refrigerant recovery machine according to claim 6, characterized in that: The support (61) comprises a first annular portion (611), a second annular portion (612) and a plurality of columnar portions (613) therebetween, the air inlet passage being formed between the plurality of columnar portions (613), an annular convex portion (12) being formed at the air inlet hole (11) of the valve seat (1), the first annular portion (611) being sleeved outside the annular convex portion (12), the diameter of an outer circle formed by the plurality of columnar portions (613) being smaller than that of the first annular portion (611) and forming a step; An annular groove (13) is also formed outside the annular protrusion (12) of the valve seat (1), and the height of the first annular portion (611) is adapted to the depth of the annular groove (13).

8. The ventilation structure of the refrigerant recovery machine according to claim 7, characterized in that: The lower end of the spring seat (62) forms the air intake guide portion (625), the air intake guide portion (625) is inserted into the second annular portion (612), the air intake guide portion (625) is clearance-matched with the air intake valve core (2), and the second annular portion (612) supports the spring seat (62); The air intake spring (7) is a cylindrical spring; The abutment assembly comprises a first elastic member (3), a second elastic member (4) and a top ring (5), and the top ring (5) is provided with the limiting groove (51).

9. The ventilation structure of the refrigerant recovery machine according to claim 1 or 2, characterized in that: The ventilation structure of the refrigerant recovery machine includes an air outlet structure, and the air outlet structure includes: The valve seat (1) is provided with an air outlet hole (14); An outlet valve core (2A) is axially movable relative to the outlet hole (14); An air outlet protection component (6A) is arranged on the valve seat (1) and has an air outlet guide portion for guiding the air outlet valve core (2A); An air outlet spring (7A) is provided on the air outlet valve core (2A) and is respectively in contact with the air outlet protection component (6A) and the air outlet valve core (2A); The air outlet protection component (6A) has an air outlet annular wall, the air outlet annular wall surrounds the air outlet spring (7A), the air outlet spring (7A) is a distance away from the valve seat (1), and the area of ​​the air outlet protection component (6A) located between the air outlet spring (7A) and the valve seat (1) forms an air outlet channel.

10. The ventilation structure of the refrigerant recovery machine according to claim 9, characterized in that: The gas outlet protection assembly (6A) comprises a gas outlet protection sleeve (63) and a positioning pin (64), the gas outlet protection sleeve (63) being fixed to the valve seat (1) via the positioning pin (64), and one end of the gas outlet protection sleeve (63) close to the gas outlet hole (14) being hollowed out to form the gas outlet channel; The air outlet protective sleeve (63) comprises a cylindrical portion (631), a reinforcement portion (632) and an opening portion (633); one end of the air outlet spring (7A) abuts against the cylindrical portion (631); the cylindrical portion (631) forms the air outlet annular wall; the cylindrical portion (631) is clearance-matched with the air outlet valve core (2A).

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