Refrigerant recovery device ventilation structure

Abstract

The present invention relates to a ventilation structure for a refrigerant recovery unit. To address the lack of protection for the springs of the intake and / or exhaust valves of a conventional refrigerant recovery unit when impacted by liquid refrigerant, the present invention provides the following solution. The ventilation structure for a refrigerant recovery unit includes a valve seat (1) with an air hole, a valve body (2, 2A) axially movable relative to the air hole, a compression spring (7, 7A) attached to the valve body, and a protection unit (6, 6A) mounted on the valve seat. The protection unit has an annular wall (621) surrounding the compression spring, with a predetermined distance between the compression spring and the valve seat. The region of the protection unit located between the compression spring and the valve seat forms a radial ventilation passage. The beneficial effect of the ventilation structure for a refrigerant recovery unit of the present invention is that it reduces or avoids the impact of liquid refrigerant on the compression spring due to radial airflow.

Description

[Technical Field]

[0001] The present invention relates to the technical field of refrigerant recovery, and particularly to a ventilation structure for a refrigerant recovery device. [Background technology]

[0002] The Chinese utility model with the grant publication number CN217422205U discloses an intake valve for a refrigerant recovery device, comprising: a valve seat with an intake hole; a valve body axially movable in the intake hole, the valve body having an attachment groove at one end remote from the intake hole; a first elastic piece attached to the attachment groove; a second elastic piece abutting against the first elastic piece; a flat washer abutting against the circular piece; and compression springs abutting against the valve seat and the flat washer, respectively. In this utility model, the additional elastic piece is arranged to absorb some of the energy by deforming, thereby reducing the force received by the first elastic piece and making it less likely to break or loosen.

[0003] However, the solution of the above utility model still has some defects, namely: 1. The liquid coolant in the airflow will cause a radial impact on the spring, causing it to be distorted. In this case, the risk of the spring breaking will increase when it is reciprocated; 2. The spring stroke is not limited, and the greater the load, the greater the spring stroke, which will make it less fatigue-resistant and more likely to break; 3. When a conical spring is used, as the pitch becomes smaller during the spring compression process, the amount of air intake at the valve seat inlet will also decrease, and the gap between the conical spring and the valve disc will also become larger, resulting in a large radial skew of the conical spring; 4. After the spring breaks, the valve disc will no longer be guided by the spring, and the stroke will be too long, causing the valve disc to be distorted, resulting in collisions between the valve disc rod and the valve seat. After multiple collisions, the valve disc will be deformed, which will disable the function of the entire ventilation structure and result in the compressor not working. The vent valve of the refrigerant recovery unit also has a similar defect, namely: 1. The liquid refrigerant will cause radial impact on the spring; 2. The valve body will not be guided, or the guiding effect will be poor, or it will be difficult to ensure the guiding effect; 3. After the spring breaks, the broken spring wire will enter the internal passage, affecting the service life of the compressor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Chinese Utility Model Patent CN217422205U Summary of the Invention [Problem to be solved by the invention]

[0005] In response to the defect of the springs of the intake valve and / or exhaust valve of the conventional refrigerant recovery device lacking protection when impacted by the liquid refrigerant, the present invention provides a refrigerant recovery device ventilation structure to protect the springs, avoid or reduce the impact of the liquid refrigerant on the springs, and further avoid or reduce the spring failure and the negative consequences caused by the spring failure, and further guide the springs, reduce or avoid the spring skew, limit the spring stroke, and extend the spring life. [Means for solving the problem]

[0006] To achieve the above objectives, the present invention uses the following technical solutions: The refrigerant recovery device ventilation structure includes: a valve seat through which the pores are opened; a valve body that moves axially relative to the pore; a compression spring attached to the valve body; a protection unit provided on the valve seat, The protection unit has an annular wall surrounding the compression spring, the compression spring and the valve seat have a predetermined distance between them, and the area of ​​the protection unit located between the compression spring and the valve seat forms a radial ventilation passage.

[0007] The ventilation structure of the refrigerant recovery device of the present invention comprises a protection unit, the protection unit comprising an annular wall surrounding a compression spring, the annular wall reducing or avoiding the impact of liquid coolant on the compression spring in the radial airflow, the compression spring and the valve seat having a predetermined distance therebetween, the region of the protection unit located between the compression spring and the valve seat forming a radial ventilation passage, all or part of the liquid coolant being carried by the airflow along the outer wall of the annular wall to reach the ventilation passage, and then reaching the air pores through the ventilation passage, reducing or avoiding the liquid coolant passing through the compression spring and impacting the compression spring.

[0008] As an improvement, the protection unit includes a guide portion that guides the valve body against a middle portion thereof, and the compression spring is located farther from the pore than the guide portion.

[0009] In an improvement, the refrigerant recovery unit ventilation structure includes an air intake structure, the air intake structure comprising: the valve seat through which an intake hole is opened; an intake valve body that moves in an axial direction relative to the intake port; a contact unit attached to one end of the intake valve body remote from the intake port; an intake protection unit provided on the valve seat; an intake spring fitted onto the outside of the intake valve body and abutting against the intake protection unit and the abutment unit, respectively; The intake protection unit has an intake annular wall surrounding the intake spring, the intake spring and the valve seat have a predetermined distance between them, and the area of ​​the intake protection unit located between the intake spring and the valve seat forms an intake passage.

[0010] As an improvement, the axial projections of the abutment unit and the intake protection unit at least partially overlap, thereby limiting the compression degree of the intake spring; A position limiting groove is formed in the surface of the abutment unit facing the valve seat, and one end of the intake spring engages with the position limiting groove.

[0011] As an improvement, the intake protection unit is formed with a guide slope, a position limiting portion, a support portion, and an intake guide portion that guides the intake valve body, the intake spring abuts on the support portion, and the position limiting portion limits the radial direction of the intake spring; a radial gap between the intake annular wall and the intake spring is smaller than a radial gap between the intake spring and the intake valve body; The upper end of the intake annular wall extends radially outward to form a convex ring.

[0012] As an improvement, the intake protection unit includes a holder and a spring seat that are fixedly connected, the holder is attached to the valve seat, the intake annular wall is formed in the spring seat, and the holder is hollow and forms the intake passage.

[0013] As an improvement, the holder includes a first annular portion, a second annular portion, and a plurality of pillar portions between the first and second annular portions, the plurality of pillar portions forming the intake passage, an annular protrusion is formed at the intake hole of the valve seat, the first annular portion is fitted onto the outside of the annular protrusion, and the diameter of an outer circle formed by the plurality of pillar portions is smaller than that of the first annular portion, forming a step; A ring groove is further formed outside the annular protrusion of the valve seat, and the height of the first annular portion matches the depth of the ring groove.

[0014] As an improvement, the intake guide portion is formed at a lower end of the spring seat, the intake guide portion is inserted into the second annular portion, the intake guide portion and the intake valve body are loosely fitted, and the second annular portion supports the spring seat; the intake spring is a cylindrical spring, The contact unit includes a first elastic component, a second elastic component, and a top ring, and the position limiting groove is formed in the top ring.

[0015] In an improvement, the refrigerant recovery unit ventilation structure includes an exhaust structure, the exhaust structure comprising: the valve seat through which a vent hole is opened; an exhaust valve body A that moves in the axial direction relative to the exhaust hole; an exhaust protection unit provided on the valve seat and including an exhaust guide portion that guides the exhaust valve body A; an exhaust spring A provided on the exhaust valve body A and abutting against the exhaust protection unit and the exhaust valve body A, The exhaust protection unit has an exhaust annular wall surrounding the exhaust spring A, the exhaust spring A and the valve seat have a predetermined distance between them, and the area of ​​the exhaust protection unit located between the exhaust spring A and the valve seat forms an exhaust passage.

[0016] As an improvement, the exhaust protection unit includes an exhaust protection cover and a positioning pin, and the positioning pin fixes the exhaust protection cover to the valve seat, and one end of the exhaust protection cover that is close to the exhaust hole is hollow to form the exhaust passage; The exhaust protection cover has a cylindrical portion, a reinforcing portion, and an opening portion, one end of the exhaust spring A abuts against the cylindrical portion, the cylindrical portion forms the exhaust annular wall, and the cylindrical portion and the exhaust valve body A are fitted with a clearance. [Effects of the Invention]

[0017] The beneficial effects of the refrigerant recovery unit ventilation structure of the present invention are as follows: The protective unit includes an annular wall surrounding a compression spring, the annular wall reducing or avoiding the impact of liquid coolant in radial airflow on the compression spring, the compression spring and the valve seat being spaced a predetermined distance apart, and the area of ​​the protective unit located between the compression spring and the valve seat forming a radial ventilation passage, with all or part of the liquid coolant traveling along the outer wall of the annular wall with the airflow reaching the ventilation passage and reaching the air pores through the ventilation passage, thereby reducing or avoiding the liquid coolant passing through the compression spring and impacting the compression spring. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a schematic diagram of the three-dimensional structure of the intake structure of the ventilation structure of the refrigerant recovery device according to the first embodiment of the present invention. FIG. [Figure 2] 1 is a cross-sectional view of an intake structure of a ventilation structure for a refrigerant recovery device according to a first embodiment of the present invention. [Figure 3] 1 is an exploded view of the intake structure of the ventilation structure of the refrigerant recovery device according to the first embodiment of the present invention. FIG. [Figure 4] 1 is a structural schematic diagram of a valve seat of an intake structure of a ventilation structure for a refrigerant recovery device according to a first embodiment of the present invention. FIG. [Figure 5] 1 is a structural schematic diagram of a valve body of an intake structure of a ventilation structure for a refrigerant recovery device according to a first embodiment of the present invention. FIG. [Figure 6] 1 is a structural schematic diagram of a holder of a protection unit of an intake structure of a ventilation structure of a refrigerant recovery device according to a first embodiment of the present invention; [Figure 7] 7 and 8 are structural schematic diagrams of the spring seat of the protection unit of the intake structure of the ventilation structure for the refrigerant recovery device according to the first embodiment of the present invention, seen from different angles. [Figure 8] 7 and 8 are structural schematic diagrams of the spring seat of the protection unit of the intake structure of the ventilation structure for the refrigerant recovery device according to the first embodiment of the present invention, seen from different angles. [Figure 9] 1 is a cross-sectional view of an intake structure of a ventilation structure for a refrigerant recovery device according to a first embodiment of the present invention (a cylinder head is further shown in addition to FIG. 2). [Figure 10] 1 is a schematic diagram of the three-dimensional structure of the exhaust structure of the ventilation structure of the refrigerant recovery device according to the first embodiment of the present invention. FIG. [Figure 11] 1 is a cross-sectional view of an exhaust structure of a ventilation structure for a refrigerant recovery device according to a first embodiment of the present invention. [Figure 12] 1 is an exploded view of the exhaust structure of the ventilation structure of the refrigerant recovery device according to the first embodiment of the present invention. FIG. [Figure 13] 1 is a structural schematic diagram of an exhaust protection cover of an exhaust structure of a ventilation structure of a refrigerant recovery device according to a first embodiment of the present invention; [Figure 14] 10 is a cross-sectional view of an exhaust structure of a ventilation structure for a refrigerant recovery device according to a first embodiment of the present invention (a cylinder head is further shown in addition to the configuration of FIG. 10). DETAILED DESCRIPTION OF THE INVENTION

[0019] The following provides an explanation of the technical solutions of the embodiments of the present invention, but the following examples are not all examples of the present invention, but only preferred examples. Based on the examples in the embodiments, any other examples obtained by a person skilled in the art without exerting any inventive effort are within the scope of protection of the present invention.

[0020] Referring to FIGS. 1 to 14, a ventilation structure for a refrigerant recovery device, The refrigerant recovery device ventilation structure includes: a valve seat through which the pores are opened; a valve body that moves axially relative to the pore; a compression spring fitted onto the outside of the valve body; a protection unit provided on the valve seat, The protection unit has a guide portion that guides the middle portion of the valve body, and the compression spring is located farther from the pore than the guide portion.

[0021] In the ventilation structure for a refrigerant recovery unit of the present invention, a protection unit is provided on the valve seat, and the protection unit has a guide portion that guides the valve disc. The protection unit guides the middle portion of the valve disc, thereby preventing or avoiding skew of the valve disc. The protection unit is provided on the valve seat, and an air hole is also provided in the valve seat, which more easily ensures the concentricity between the protection unit and the valve disc and ensures the guiding effect.

[0022] [Example 1] 1 to 14, a ventilation structure for a refrigerant recovery device according to a first embodiment of the present invention includes an intake structure and an exhaust structure.

[0023] 1 to 9, an intake structure of a ventilation structure for a refrigerant recovery device according to a first embodiment of the present invention is shown, a valve seat 1 through which an intake hole 11 is opened; an intake valve body (2) provided in the intake hole (11) so as to be movable in the axial direction, the intake valve body (2) having an attachment groove formed at one end thereof remote from the valve seat (1); a first elastic component 3 attached to the attachment groove; a top ring (5) fitted onto the outside of the intake valve body (2) and closer to the valve seat (1) than the first elastic component (3); a second elastic component 4 located between the first elastic component 3 and the top ring 5; an intake protection unit 6 provided on the valve seat 1; an intake spring 7 fitted onto the outside of the intake valve body 2 and abutting against the intake protection unit 6 and the top ring 5, The intake protection unit 6 includes a guide portion that guides the intake valve body 2, The intake protection unit 6 includes an intake annular wall 621 surrounding the intake spring 7 .

[0024] In this embodiment, the intake annular wall 621 surrounds only a portion of the intake spring 7 .

[0025] Referring to FIG. 2, in this embodiment, a position limiting groove 51 is formed on the surface of the top ring 5 facing the valve seat 1, and one end of the intake spring 7 engages with the position limiting groove 51. The position limiting groove 51 limits the radial displacement of the intake spring 7. Generally, the position limiting groove 51 engages with the intake spring 7 somewhat tightly. The position limiting groove 51 is chamfered to make it easier for the intake spring 7 to enter the position limiting groove 51. The depth of the position limiting groove 51 is slightly larger than the wire diameter of the intake spring 7.

[0026] 2 and 7, in this embodiment, the intake protection unit 6 further includes a guide slope 622, a position limiting portion 623, and a support portion 624 formed on the inside thereof, the intake spring 7 abuts against the support portion 624, and the position limiting portion 623 limits the radial direction of the intake spring 7. Generally, the position limiting portion 623 tightly engages with the intake spring 7. The height of the position limiting portion 623 is slightly larger than the wire diameter of the intake spring 7.

[0027] Referring to Figure 2, in this embodiment, the radial gap between the intake annular wall 621 and the intake spring 7 is made smaller than the radial gap between the intake spring 7 and the intake valve body 2, thereby avoiding or reducing friction between the intake spring 7 and the intake valve body 2.

[0028] 2, in this embodiment, the axial projections of the lower end of the top ring 5 and the upper end of the intake protection unit 6 at least partially overlap. When the intake annular wall 621 and the top ring 5 contact each other, the compression degree of the intake spring 7 is maximized, and the upper end of the intake annular wall 621 extends radially outward to form a convex ring 626. The top ring 5 and the intake protection unit 6 limit the maximum stroke of the intake valve body 2 and further limit the maximum compression degree of the intake spring 7, thereby extending the service life of the intake spring 7. The convex ring 626 increases the contact area between the intake protection unit 6 and the top ring 5.

[0029] 2, 4, 6 to 8, in this embodiment, the intake protection unit 6 includes a holder 61 and a spring seat 62 that are fixedly connected, the holder 61 is fixed to the valve seat 1, the intake annular wall 621 is formed on the spring seat 62, and the holder 61 is hollow and forms an intake passage. The intake protection unit 6 is assembled from the holder 61 and the spring seat 62, and is easy to process. In other embodiments, the intake protection unit may be an integrated part.

[0030] In this embodiment, the holder 61 includes a first annular portion 611, a second annular portion 612, and a plurality of pillar portions 613 between the first and second annular portions, and the space between the pillar portions 613 forms the intake passage.

[0031] In this embodiment, an annular protrusion 12 is formed on the intake hole 11 of the valve seat 1, the first annular portion 611 is fitted onto the outside of the annular protrusion 12, the diameter of the outer circle formed by the multiple pillar portions 613 is smaller than that of the first annular portion 611, forming a staircase, and a ring groove 13 is further formed on the outside of the annular protrusion 12 of the valve seat 1, and the height of the first annular portion 611 matches the depth of the ring groove 13.

[0032] In this embodiment, an intake guide portion 625 is formed at the lower end of the spring seat 62, and the intake guide portion 625 is inserted into the second annular portion 612, the intake guide portion 625 and the intake valve body 2 are fitted with a gap, and the second annular portion 612 supports the spring seat 62.

[0033] 2 and 5, the intake valve body 2 has a conical portion, a columnar portion and a transition portion that engage with the intake hole 11 of the valve seat 1, and an attachment groove is formed in the columnar portion.

[0034] 9, the ventilation structure is used in a compressor, and the compressor includes a cylinder body (not shown) and a cylinder head 8 that are fixedly connected. The cylinder body is abutted against a valve seat 1, and the cylinder body and the cylinder head fix the valve seat 1 and a holder 61 to prevent the holder 61 from being distorted. When the valve seat 1 is fixed, there is an axial gap between the column portion 613 of the holder 61 and the annular protrusion 12 of the valve seat 1. An airflow passage is formed in the cylinder head 8.

[0035] In this embodiment, the intake spring 7 is a cylindrical spring. A cylindrical spring may be used because the intake protection unit 6 is installed, the spring seat 62 of the intake protection unit 6 is higher, and the overall position of the spring seat 62 corresponds to the columnar portion of the intake valve body 2. Compared to a conical coil spring, a cylindrical spring (a cylindrical coil intake spring with a circular cross section) has small radial distortion, a linear characteristic curve, stable rigidity, a simple structure, and easy manufacturing.

[0036] In this embodiment, an intake protection unit 6 having an intake annular wall 621 is arranged, and the intake passage is arranged 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, and avoids or prevents the intake spring 7 from being impacted by the liquid coolant.

[0037] The beneficial effects of the intake structure of the ventilation structure for the refrigerant recovery device according to the first embodiment of the present invention are as follows: The intake protection unit 6 is provided with an intake annular wall 621 surrounding the lower part of the intake spring 7, the intake annular wall 621 avoids or reduces the impact of the liquid coolant on the spring, and reduces the risk of the intake spring 7 being disabled, the intake protection unit 6 limits the maximum compression degree of the intake spring 7, and extends the service life of the intake spring 7, and the intake spring 7 is made of a cylindrical spring, so that the radial distortion is small, and the radial distortion between the multiple pillars 613 of the holder 61 of the intake protection unit 6 is small. The intake spring 7 forms a directional intake passage, blocking or reducing the airflow through the intake spring 7 and avoiding or reducing the impact received by the intake spring 7. The degree of compression of the intake spring 7 does not affect the intake volume. The top ring 5 and spring seat 62 limit the radial displacement of both ends of the intake spring 7. Even if the intake spring 7 becomes ineffective, the intake guide portion 625 of the spring seat 62 is positioned so that the intake valve body 2 is hardly distorted. This prevents or reduces collision between the intake valve body 2 and the valve seat 1 and shortens the intake path.

[0038] In other embodiments, the following configurations for the intake structure may be used: By making the inner diameter of the annular wall of the spring seat larger than the outer diameters of the top ring, the first elastic component, and the second elastic component, and increasing the height of the annular wall, the top ring, the first elastic component, and the second elastic component enter the spring seat, further preventing or reducing the impact of the liquid coolant on the compression spring, and in this case, the restrictive effect of the spring seat and the top ring on the stroke of the compression spring disappears.

[0039] 10 to 14, an exhaust structure of a ventilation structure for a refrigerant recovery apparatus according to a first embodiment of the present invention is shown, the valve seat 1 in which an exhaust hole 14 is opened; an exhaust valve body 2A that moves in the axial direction relative to the exhaust hole 14; an exhaust protection unit 6A provided on the valve seat 1 and including an exhaust guide portion that guides the exhaust valve body 2A; an exhaust spring 7A fitted onto the outside of the exhaust valve body 2A and abutting against the exhaust protection unit 6A and the exhaust valve body 2A, The exhaust protection unit 6A has an exhaust guide portion that guides the exhaust valve body 2A, The exhaust protection unit 6A comprises an exhaust annular wall surrounding the exhaust spring 7A.

[0040] In this embodiment, the exhaust protection unit 6A includes an exhaust protection cover 63 and a positioning pin 64, and the exhaust protection cover 63 is fixed to the valve seat 1 by the positioning pin 64, and one end of the exhaust protection cover 63 that is close to the exhaust hole 14 forms an exhaust passage.

[0041] In this embodiment, the exhaust protection cover 63 has a cylindrical portion 631, a reinforcing portion 632 and an opening portion 633, one end of the exhaust spring 7A abuts against the cylindrical portion 631, the cylindrical portion 631 forms the exhaust annular wall, there are two opening portions 633 and there are two positioning pins 64.

[0042] In this embodiment, the exhaust valve body 2A includes a truncated cone portion and a stepped shaft portion located in the exhaust hole 14, the stepped shaft portion has a large diameter segment and a small diameter segment, the exhaust spring 7A is fitted onto the small diameter segment and abuts against the large diameter segment, and the cylindrical portion 631 guides the large diameter segment of the stepped shaft portion.

[0043] In this embodiment, an intake hole 11 and an exhaust hole 14 are opened in the same valve seat 1 of the ventilation structure.

[0044] The beneficial effects of the exhaust structure of the ventilation structure for the refrigerant recovery device according to the first embodiment of the present invention are as follows: The exhaust protection unit 6A provides a guiding function for the exhaust valve body 2A, and also provides a protective function for the exhaust spring 7A, preventing the entire exhaust spring 7A from being impacted by the liquid coolant, making the exhaust spring 7A less susceptible to damage and having a long service life. The exhaust protection unit 6A encases the exhaust spring 7A, providing good protection. One end of the exhaust protection unit 6A that approaches the valve seat 1 forms an exhaust passage, and the exhaust protection unit 6A is attached to the valve seat 1, which easily ensures the coaxiality between the exhaust valve body 2A and the exhaust protection cover 63 of the exhaust protection unit 6A and also ensures a guiding effect.

[0045] The above are only specific embodiments of the present invention, and 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 amendments that do not deviate from the functional and structural principles of the present invention are also included in the scope of the claims. [Explanation of symbols]

[0046] 1 Valve seat 11 Air intake 12 Annular protrusion 13 Ring groove 14 Exhaust vent 2 Intake valve body 3. First elastic part 4 Second elastic part 5 Top Ring 51 Position limiting groove 6 Intake protection unit 61 Holder 611 First Circular Section 612 Second Circular Section 613 Column section 62 Spring seat 621 Intake annular wall 622 Guide Slope 623 Position Restriction Section 624 Support part 625 Intake guide 626 Convex Ring 7 Intake spring 2A Exhaust valve body 6A Exhaust Protection Unit 63 Exhaust protection cover 631 Cylindrical part 632 Reinforcement 633 Opening part 64 Locating pin 7A Exhaust spring 8. Cylinder head

Claims

1. A ventilation structure for a refrigerant recovery unit, the ventilation structure for the refrigerant recovery unit comprising: a valve seat (1) with a vent hole; a valve body that moves axially relative to the pore; a compression spring attached to the valve body; a protection unit provided on the valve seat (1), The protection unit has an annular wall surrounding the compression spring, the compression spring and the valve seat (1) are spaced apart by a predetermined distance, and the area of ​​the protection unit located between the compression spring and the valve seat (1) forms a radial ventilation passage.

2. 2. The ventilation structure for a refrigerant recovery unit according to claim 1, wherein the protection unit includes a guide portion that guides the middle portion of the valve body, and the compression spring is located farther from the pore than the guide portion.

3. The refrigerant recovery device ventilation structure includes an intake structure, and the intake structure includes: The valve seat (1) having an intake hole (11) formed therein; an intake valve body (2) that moves axially relative to the intake hole (11); a contact unit attached to one end of the intake valve body (2) away from the intake hole (11); an intake protection unit (6) provided on the valve seat (1); an intake spring (7) fitted onto the outside of the intake valve body (2) and abutting against the intake protection unit (6) and the abutment unit, The ventilation structure for a refrigerant recovery device according to claim 1 or 2, characterized in that the intake protection unit (6) comprises an intake annular wall (621) surrounding the intake spring (7), the intake spring (7) and the valve seat (1) have a predetermined distance therebetween, and the area of ​​the intake protection unit (6) located between the intake spring (7) and the valve seat (1) forms an intake passage.

4. the axial projections of the abutment unit and the intake protection unit (6) at least partially overlap, limiting the compression of the intake spring (7); 4. The refrigerant recovery device ventilation structure according to claim 3, wherein a position limiting groove (51) is formed on a surface of the abutment unit facing the valve seat (1), and one end of the intake spring (7) engages with the position limiting groove (51).

5. The intake protection unit (6) further includes a guide slope (622), a position limiting portion (623), a support portion (624), and an intake guide portion (625) that guides the intake valve body (2), the intake spring (7) abuts against the support portion (624), and the position limiting portion (623) limits the radial direction of the intake spring (7); a radial gap between the intake annular wall (621) and the intake spring (7) is smaller than a radial gap between the intake spring (7) and the intake valve body (2); 4. The refrigerant recovery unit ventilation structure according to claim 3, wherein the upper end of the intake annular wall (621) extends radially outward to form a convex ring (626).

6. 6. The ventilation structure of claim 5, wherein the intake protection unit (6) includes a holder (61) and a spring seat (62) fixedly connected to each other, the holder (61) is attached to the valve seat (1), the intake annular wall (621) is formed on the spring seat (62), and the holder (61) is hollow and forms the intake passage.

7. The holder (61) includes a first annular portion (611), a second annular portion (612), and a plurality of pillar portions (613) between the first and second annular portions, and the plurality of pillar portions (613) form the intake passage between them. An annular protrusion (12) is formed in the intake hole (11) of the valve seat (1). The first annular portion (611) is fitted onto the outside of the annular protrusion (12). The diameter of the outer circle formed by the plurality of pillar portions (613) is smaller than that of the first annular portion (611), forming a step.

7. The ventilation structure of claim 6, wherein a ring groove (13) is further formed on the outside of the annular protrusion (12) of the valve seat (1), and the height of the first annular portion (611) matches the depth of the ring groove (13).

8. The intake guide portion (625) is formed at the lower end of the spring seat (62), the intake guide portion (625) is inserted into the second annular portion (612), the intake guide portion (625) and the intake valve body (2) are loosely fitted, and the second annular portion (612) supports the spring seat (62); The intake spring (7) is a cylindrical spring, 8. The ventilation structure for a refrigerant recovery device according to claim 7, wherein the abutment unit includes a first elastic component (3), a second elastic component (4), and a top ring (5), and the position limiting groove (51) is formed in the top ring (5).

9. The refrigerant recovery device ventilation structure includes an exhaust structure, and the exhaust structure includes: the valve seat (1) having an exhaust hole (14) therein; an exhaust valve body (2A) that moves in the axial direction relative to the exhaust hole (14); an exhaust protection unit (6A) provided on the valve seat (1) and including an exhaust guide portion that guides the exhaust valve body (2A); an exhaust spring (7A) provided on the exhaust valve body (2A) and abutting against the exhaust protection unit (6A) and the exhaust valve body (2A), 3. The ventilation structure for a refrigerant recovery device according to claim 1, wherein the exhaust protection unit (6A) includes an exhaust annular wall surrounding the exhaust spring (7A), the exhaust spring (7A) and the valve seat (1) are spaced a predetermined distance apart, and a region of the exhaust protection unit (6A) located between the exhaust spring (7A) and the valve seat (1) forms an exhaust passage.

10. The exhaust protection unit (6A) includes an exhaust protection cover (63) and a positioning pin (64), and the exhaust protection cover (63) is fixed to the valve seat (1) by the positioning pin (64). One end of the exhaust protection cover (63) that is close to the exhaust hole (14) is hollow and forms the exhaust passage.

10. The ventilation structure for a refrigerant recovery device according to claim 9, wherein the exhaust protection cover (63) comprises a cylindrical portion (631), a reinforcing portion (632) and an opening portion (633), one end of the exhaust spring (7A) abuts against the cylindrical portion (631), the cylindrical portion (631) forms the exhaust annular wall, and the cylindrical portion (631) and the exhaust valve body (2A) are fitted with a clearance.

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