Refrigerant recovery system 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 belongs to the technical field of refrigerant recovery, and specifically relates to a ventilation structure of a refrigerant recovery device.

Background Art

[0002] Chinese Utility Model with the authorization announcement number CN217422205U discloses an intake valve of a refrigerant recovery device, including a valve seat with an intake hole opened thereon, and a valve body movably provided in the intake hole in the axial direction. A mounting groove is opened at one end of the valve body away from the intake hole, a first elastic component mounted in the mounting groove, a second elastic component abutted against the first elastic component, a flat washer abutted against the circular component, and a compression spring abutted against the valve seat and the flat washer respectively. In this utility model, elastic components are additionally arranged, and the elastic components absorb some energy by deformation, thereby reducing the force received by the first elastic component, and making the first elastic component less likely to be damaged and loosened.

[0003] However, the solution of the above utility model still has the following several defects, that is, 1. The liquid refrigerant in the air flow causes a radial impact on the spring, and the spring is in a distorted state. In this case, when performing reciprocating motion, the risk of spring breakage increases; 2. The stroke of the spring is not limited. The greater the load, the greater the stroke of the spring, and it is likely to become insufficient in fatigue resistance, leading to spring breakage; 3. Using a conical spring, during the compression process of the spring, as the pitch decreases, the intake air volume of the valve seat intake port also decreases. Also, the gap between the conical spring and the valve body is large, and the radial skew of the conical spring is large; 4. After the spring breaks, the movement of the valve body loses the guiding effect of the spring. Due to the stroke being too long, the valve body is distorted, and the valve body rod part and the valve seat collide. After colliding multiple times, the valve body is deformed, thereby rendering the function of the entire ventilation structure ineffective, and as a result, the compressor cannot operate. In addition, the exhaust valve of the refrigerant recovery device also has similar defects, that is, 1. The liquid coolant causes radial impact on the spring; 2. It does not guide the valve body, or the guiding effect is poor, or the guiding effect is difficult to guarantee; 3. After the spring breaks, the broken spring wire enters the internal passage, affecting the compressor's lifespan. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Chinese Utility Model CN217422205U [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] In response to the drawback of conventional refrigerant recovery systems where the springs of the intake and / or exhaust valves are subjected to impact from the liquid coolant and lack protection, the present invention provides a refrigerant recovery system ventilation structure that protects the springs, avoids or reduces the impact from the liquid coolant on the springs, and further avoids or reduces spring failure and the adverse consequences caused by spring failure. Furthermore, it guides the springs, reduces or avoids spring skew, limits the spring stroke, and extends the spring life. [Means for solving the problem]

[0006] To achieve the above objectives, the present invention utilizes the following technical solutions: The refrigerant recovery device ventilation structure is, A valve seat from which stomata can be opened, A valve body that acts axially with respect to the aforementioned stomata, A compression spring attached to the valve body, The valve seat includes a protective unit, The protective unit comprises an annular wall surrounding the compression spring, the compression spring and the valve seat are at a predetermined distance from each other, and the region of the protective unit located between the compression spring and the valve seat forms a radial ventilation passage.

[0007] The refrigerant recovery device ventilation structure of the present invention comprises a protective unit, the protective unit comprising an annular wall surrounding a compression spring, the annular wall reducing or avoiding the impact of the liquid coolant on the compression spring in the radial airflow, the compression spring and the valve seat being at a predetermined distance from each other, the region of the protective 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 the ventilation passage, reaching the pores through the ventilation passage, reducing or avoiding the liquid coolant impacting the compression spring via the compression spring.

[0008] As an improvement, the protective unit is provided with a guide portion that guides the intermediate portion of the valve body, and the compression spring is positioned further away from the pore than the guide portion.

[0009] As an improvement, the refrigerant recovery device ventilation structure includes an intake structure, and the intake structure is The valve seat from which an intake port is opened, An intake valve body that operates axially with respect to the intake port, A contact unit attached to one end of the intake valve body away from the intake port, An intake protection unit provided on the valve seat, The intake spring is fitted onto the outside of the intake valve body and contacts the intake protection unit and the contact unit, respectively. The intake protection unit comprises an intake annular wall surrounding the intake spring, the intake spring and the valve seat are at a predetermined distance from each other, and the region 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 contact unit and the intake protection unit overlap at least partially, thereby limiting the degree of compression of the intake spring. A position-restricting groove is provided on the surface of the contact unit facing the valve seat, and one end of the intake spring engages with the position-restricting 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 against the support portion, and the position limiting portion restricts the radial direction of the intake spring. 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 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 fixedly connected holder and a spring seat, the holder being attached to the valve seat, the intake annular wall being formed in the spring seat, the holder being hollow and forming the intake passage.

[0013] As an improvement, the holder includes a first annular portion, a second annular portion, and a plurality of columnar portions between them, the space between the plurality of columnar portions forming the intake passage, an annular projection is formed in the intake hole of the valve seat, the first annular portion is fitted onto the outside of the annular projection, the diameter of the outer circle formed from the plurality of columnar portions is smaller than that of the first annular portion, forming a step, A ring groove is further formed on the outside of the annular projection 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 the 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 fitted together, and the second annular portion supports the spring seat. The aforementioned intake spring is a cylindrical spring. The contact unit includes a first elastic component, a second elastic component, and a top ring, the top ring having the position limiting groove.

[0015] As an improvement, the refrigerant recovery device ventilation structure includes an exhaust structure, and the exhaust structure is The valve seat from which an exhaust port is opened, An exhaust valve body A that operates axially with respect to the exhaust port, An exhaust protection unit provided on the valve seat and including an exhaust guiding portion for guiding the exhaust valve body A; An exhaust spring A provided on the exhaust valve body A and respectively abutted against the exhaust protection unit and the exhaust valve body A; The exhaust protection unit includes an exhaust annular wall surrounding the exhaust spring A. The exhaust spring A and the valve seat have a predetermined distance. The region of the exhaust protection unit located between the exhaust spring A and the valve seat forms an exhaust passage.

[0016] [[ID=⑧]]As an improvement, the exhaust protection unit includes an exhaust protection cover and a positioning pin. The exhaust protection cover is fixed to the valve seat by the positioning pin. One end of the exhaust protection cover close to the exhaust hole is hollow and forms the exhaust passage. The exhaust protection cover includes a cylindrical portion, a reinforcing portion, and a hole opening portion. One end of the exhaust spring A abuts against the cylindrical portion. The cylindrical portion forms the exhaust annular wall. The cylindrical portion and the exhaust valve body A are fitted with a gap.

Advantages of the Invention

[0017] The beneficial effects of the ventilation structure of the refrigerant recovery device of the present invention are as follows: It includes a protection unit. The protection unit includes an annular wall surrounding the compression spring. The annular wall reduces or avoids the impact of the liquid coolant on the compression spring in the airflow from the radial direction. The compression spring and the valve seat have a predetermined distance. The region of the protection unit located between the compression spring and the valve seat forms a radial ventilation passage. All or part of the liquid coolant reaches the ventilation passage along the outer wall of the annular wall along with the airflow and reaches the air hole through the ventilation passage, reducing or avoiding the liquid coolant from impacting the compression spring through the compression spring.

Brief Description of the Drawings

[0018] [Figure 1] It is a three-dimensional structural schematic diagram of the intake structure of the ventilation structure of the refrigerant recovery device according to Embodiment 1 of the present invention. [Figure 2] It is a cross-sectional view of the intake structure of the ventilation structure of the refrigerant recovery device according to Embodiment 1 of the present invention. [Figure 3] This is an exploded view of the intake structure of the refrigerant recovery device ventilation structure according to Embodiment 1 of the present invention. [Figure 4] This is a schematic diagram of the valve seat structure of the intake structure of the refrigerant recovery device ventilation structure according to Embodiment 1 of the present invention. [Figure 5] This is a schematic diagram of the valve body structure of the intake structure of the refrigerant recovery device ventilation structure according to Embodiment 1 of the present invention. [Figure 6] This is a schematic diagram of the structure of the holder of the protective unit for the intake structure of the refrigerant recovery device ventilation structure according to Embodiment 1 of the present invention. [Figure 7] Figures 7 and 8 are schematic diagrams of the spring seat of the protective unit of the intake structure of the refrigerant recovery device ventilation structure of Embodiment 1 of the present invention, viewed from different angles. [Figure 8] Figures 7 and 8 are schematic diagrams of the spring seat of the protective unit of the intake structure of the refrigerant recovery device ventilation structure of Embodiment 1 of the present invention, viewed from different angles. [Figure 9] This is a cross-sectional view of the intake structure of the refrigerant recovery device ventilation structure according to Embodiment 1 of the present invention (the cylinder head is further shown in Figure 2). [Figure 10] This is a schematic diagram of the three-dimensional structure of the exhaust structure of the refrigerant recovery device ventilation structure according to Embodiment 1 of the present invention. [Figure 11] This is a cross-sectional view of the exhaust structure of the refrigerant recovery device ventilation structure according to Embodiment 1 of the present invention. [Figure 12] This is an exploded view of the exhaust structure of the refrigerant recovery device ventilation structure according to Embodiment 1 of the present invention. [Figure 13] This is a schematic diagram of the structure of the exhaust protection cover of the exhaust structure of the refrigerant recovery device ventilation structure according to Embodiment 1 of the present invention. [Figure 14] A cross-sectional view of the exhaust structure of the refrigerant recovery device ventilation structure according to Embodiment 1 of the present invention (with the cylinder head further shown in Figure 10). [Modes for carrying out the invention]

[0019] The following describes the interpretation and explanation of the technical solutions of the embodiments of the present invention, but the embodiments described below are not all embodiments of the present invention, but merely preferred embodiments. Any other embodiments obtained based on the embodiments described herein, provided that a person skilled in the art does not perform work worthy of inventive step, fall within the scope of protection of the present invention.

[0020] Referring to Figures 1 to 14, the refrigerant recovery system ventilation structure is as follows: The refrigerant recovery device ventilation structure is, A valve seat from which stomata can be opened, A valve body that acts axially with respect to the aforementioned stomata, A compression spring fitted to the outside of the valve body, The valve seat includes a protective unit, The protective unit includes a guide portion that guides the intermediate portion of the valve body, and the compression spring is positioned further away from the pore than the guide portion.

[0021] In the refrigerant recovery device ventilation structure of the present invention, a protective unit is provided on the valve seat, and the protective unit has a guide portion that guides the valve body, and by guiding the intermediate portion of the valve body, the protective unit prevents or avoids skew of the valve body, and the protective unit is provided on the valve seat, and pores are also made on the valve seat, thereby more easily ensuring coaxiality between the protective unit and the valve body and ensuring the guiding effect.

[0022] [Example 1] Referring to Figures 1 to 14, the refrigerant recovery device ventilation structure of Embodiment 1 of the present invention includes an intake structure and an exhaust structure.

[0023] Referring to Figures 1 to 9, the intake structure of the refrigerant recovery device ventilation structure of Embodiment 1 of the present invention is as follows: A valve seat 1 into which the intake port 11 is opened, An intake valve body 2 is provided in the intake port 11 so as to be movable in the axial direction, wherein a mounting groove is provided at one end of the intake valve body 2 that is away from the valve seat 1, A first elastic component 3 is attached to the aforementioned mounting groove, The top ring 5 is fitted onto the outside of the intake valve body 2 and is closer to the valve seat 1 than the first elastic component 3, The second elastic component 4 is located between the first elastic component 3 and the top ring 5, The intake protection unit 6 provided on the valve seat 1, The intake spring 7 is fitted onto the outside of the intake valve body 2 and contacts the intake protection unit 6 and the top ring 5, respectively. 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 that surrounds 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 Figure 2, in this embodiment, a position limiting groove 51 is provided 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 restricts the radial displacement of the intake spring 7. Generally, the position limiting groove 51 engages with the intake spring 7 fairly tightly. The position limiting groove 51 is chamfered, making it easier for the intake spring 7 to enter the position limiting groove 51. The depth of the position limiting groove 51 is slightly greater than the wire diameter of the intake spring 7.

[0026] Referring to Figures 2 and 7, in this embodiment, a guide slope 622, a position limiting portion 623, and a support portion 624 are further formed inside the intake protection unit 6. The intake spring 7 abuts against the support portion 624, and the position limiting portion 623 restricts the radial direction of the intake spring 7. Generally, the position limiting portion 623 engages with the intake spring 7 fairly tightly. The height of the position limiting portion 623 is slightly greater than the wire diameter of the intake spring 7.

[0027] Referring to Figure 2, in this embodiment, friction between the intake spring 7 and the intake valve body 2 is avoided or reduced by making the radial gap between the intake annular wall 621 and the intake spring 7 smaller than the radial gap between the intake spring 7 and the intake valve body 2.

[0028] 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 protection unit 6 overlap at least partially, and when the intake annular wall 621 and the top ring 5 come into contact, the compression 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 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] Referring to Figures 2, 4, and 6-8, in this embodiment, the intake protection unit 6 includes a fixedly connected holder 61 and a spring seat 62, the holder 61 being fixed to the valve seat 1, the intake annular wall 621 being formed on the spring seat 62, and the holder 61 being hollow and forming an intake passage. The intake protection unit 6 is assembled from the holder 61 and the spring seat 62 and is easy to manufacture. In other embodiments, the intake protection unit may be a single integrated part.

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

[0031] In this embodiment, an annular projection 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 projection 12, the diameter of the outer circle formed from the plurality of column portions 613 is smaller than the first annular portion 611 and forms a step, a ring groove 13 is further formed on the outside of the annular projection 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, 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 together, and the second annular portion 612 supports the spring seat 62.

[0033] Referring to Figures 2 and 5, the intake valve body 2 comprises a conical portion, a columnar portion, and a transition portion that engage with the intake port 11 of the valve seat 1, and a mounting groove is provided in the columnar portion.

[0034] Referring to Figure 9, the ventilation structure is used in the compressor, which includes a fixedly connected cylinder body (not shown) and cylinder head 8. The cylinder body abuts against the valve seat 1, and the cylinder body and cylinder head fix the valve seat 1 and holder 61 to prevent the holder 61 from becoming 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 projection 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 positioned higher, the spring seat 62 of the intake protection unit 6 is higher, and the position of the entire 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 less radial distortion, its characteristic curve is linear, its rigidity is stable, its structure is simple, and it is easy to manufacture.

[0036] In this embodiment, an intake protection unit 6 equipped with an intake annular wall 621 is provided, and the intake passage is positioned in the region between the intake spring 7 and the valve seat 1. This ensures that the airflow path completely or partially avoids the intake spring 7, thereby preventing or avoiding the intake spring 7 from being subjected to impact from the liquid coolant.

[0037] The beneficial effects of the intake structure of the refrigerant recovery device ventilation structure in Embodiment 1 of the present invention are as follows: An intake protection unit 6 is provided, which includes 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, thereby reducing the risk of the intake spring 7 becoming inoperable. The intake protection unit 6 limits the maximum compression of the intake spring 7, extending its service life. By using a cylindrical spring for the intake spring 7, radial distortion is minimized, and the space between the multiple columnar parts 613 of the holder 61 of the intake protection unit 6 is radial. The intake passage is formed in the direction of the intake, blocking or reducing the airflow through the intake spring 7, thereby avoiding or reducing the impact received by the intake spring 7. Furthermore, 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 is disabled, the intake guide portion 625 of the spring seat 62 is positioned so that the intake valve body 2 hardly deforms. This prevents or reduces collision between the intake valve body 2 and the valve seat 1, resulting in a short intake path.

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

[0039] Referring to Figures 10 to 14, the exhaust structure of the refrigerant recovery device ventilation structure of Embodiment 1 of the present invention is as follows: The valve seat 1 from which the exhaust port 14 is opened, An exhaust valve body 2A that operates axially with respect to the exhaust port 14, An exhaust protection unit 6A is provided on the valve seat 1 and includes an exhaust guide section that guides the exhaust valve body 2A, The exhaust spring 7A is fitted onto the outside of the exhaust valve body 2A and contacts the exhaust protection unit 6A and the exhaust valve body 2A, respectively. The exhaust protection unit 6A includes an exhaust guide section that guides the exhaust valve body 2A, The exhaust protection unit 6A includes 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, the positioning pin 64 fixing the exhaust protection cover 63 to the valve seat 1, and one end of the exhaust protection cover 63 that approaches the exhaust hole 14 forms an exhaust passage.

[0041] In this embodiment, 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, there are two opening portions 633, and there are two positioning pins 64.

[0042] In this embodiment, the exhaust valve body 2A includes a frustoconical portion and a stepped shaft portion located at the exhaust port 14, the stepped shaft portion comprises 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 port 11 and an exhaust port 14 are provided in the same valve seat 1 of the ventilation structure.

[0044] The beneficial effects of the exhaust structure of the refrigerant recovery device ventilation structure of Embodiment 1 of the present invention are as follows: The exhaust protection unit 6A provides guidance to the exhaust valve body 2A and provides protection to the exhaust spring 7A, preventing the entire exhaust spring 7A from being subjected to impact from the liquid coolant, making the exhaust spring 7A less prone to damage and extending its service life. The exhaust protection unit 6A encloses 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. The exhaust protection unit 6A is attached to the valve seat 1, easily ensuring coaxiality between the exhaust valve body 2A and the exhaust protection cover 63 of the exhaust protection unit 6A, and further ensuring the guidance effect.

[0045] The above are merely specific embodiments of the present invention, and the scope of protection of the present invention is not limited thereto. As will be apparent to those skilled in the art, the present invention includes, but is not limited to, the contents described in the above specific embodiments. Any modification that does not depart from the functional and structural principles of the present invention is included within the scope of the claims. [Explanation of Symbols]

[0046] 1 valve seat 11 Intake port 12 Annular protrusion 13 Ring groove 14 exhaust holes 2 Intake valve body 3. First Elastic Component 4. Second Elastic Component 5 Top Ring 51 Position limiting groove 6. Intake protection unit 61 Holder 611 First Ring Section 612 Second Ring Section 613 Column section 62 Spring constellation 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 section 632 Reinforcement section 633 Opening part 64 positioning pins 7A Exhaust spring 8 Cylinder head

Claims

1. A refrigerant recovery device ventilation structure, wherein the refrigerant recovery device ventilation structure is A valve seat (1) with stomata, A valve body that acts axially with respect to the aforementioned stomata, A compression spring fitted to the outside of the valve body, The valve seat (1) includes a protective unit, The refrigerant recovery device ventilation structure is characterized in that the protective unit comprises an annular wall surrounding the compression spring, the compression spring and the valve seat (1) are at a predetermined distance from each other, and the region of the protective unit located between the compression spring and the valve seat (1) forms a radial ventilation passage.

2. The refrigerant recovery device ventilation structure according to claim 1, wherein the protective unit includes a guide portion that guides the intermediate portion of the valve body, and the compression spring is further away from the pore than the guide portion.

3. The refrigerant recovery device ventilation structure includes an intake structure, and the intake structure is The valve seat (1) has an intake hole (11) and An intake valve body (2) that operates axially with respect to the intake port (11), A contact unit attached to one end of the intake valve body (2) away from the intake hole (11), The intake protection unit (6) provided on the valve seat (1), The intake valve body (2) is fitted externally and includes an intake spring (7) that contacts the intake protection unit (6) and the contact unit, respectively. The refrigerant recovery device ventilation structure according to claim 1 or 2, wherein 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) are at a predetermined distance from each other, and the region 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 contact unit and the intake protection unit (6) overlap at least partially, thereby limiting the degree of compression of the intake spring (7). The refrigerant recovery device ventilation structure according to claim 3, characterized in that a position limiting groove (51) is provided on the surface of the contact 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) is further formed with 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) is in contact with the support portion (624), and the position limiting portion (623) restricts the radial direction of the 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 body (2). The refrigerant recovery device ventilation structure according to claim 3, characterized in that the upper end of the intake annular wall (621) extends radially outward to form a convex ring (626).

6. The refrigerant recovery device ventilation structure according to claim 5, wherein the intake protection unit (6) includes a fixedly connected holder (61) and a spring seat (62), 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 columnar portions (613) between them, the space between the plurality of columnar portions (613) forms the intake passage, an annular projection (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 projection (12), the diameter of the outer circle formed from the plurality of columnar portions (613) is smaller than that of the first annular portion (611), forming a step, The refrigerant recovery device ventilation structure according to claim 6, characterized in that a ring groove (13) is further formed on the outside of the annular projection (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 lower end of the spring seat (62) is formed with the intake guide portion (625), 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 together, and the second annular portion (612) supports the spring seat (62). The intake spring (7) is a cylindrical spring, The refrigerant recovery device ventilation structure according to claim 7, wherein the contact unit includes a first elastic component (3), a second elastic component (4), and a top ring (5), and the top ring (5) has a position limiting groove (51) that engages with one end of the intake spring (7).

9. The refrigerant recovery device ventilation structure includes an exhaust structure, and the exhaust structure is The valve seat (1) having an exhaust port (14) opened, An exhaust valve body (2A) that operates axially with respect to the exhaust port (14), An exhaust protection unit (6A) is provided on the valve seat (1) and includes an exhaust guide section that guides the exhaust valve body (2A), The exhaust valve body (2A) is fitted to the outside of the exhaust spring (7A) and contacts the exhaust protection unit (6A) and the exhaust valve body (2A), respectively. The refrigerant recovery device ventilation structure according to claim 1 or 2, characterized in that the exhaust protection unit (6A) comprises an exhaust annular wall surrounding the exhaust spring (7A), the exhaust spring (7A) and the valve seat (1) are at a predetermined distance from each other, and the 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), the positioning pin (64) fixing the exhaust protection cover (63) to the valve seat (1), and one end of the exhaust protection cover (63) that approaches the exhaust hole (14) is hollow and forms the exhaust passage. The refrigerant recovery device ventilation structure according to claim 9, characterized in that 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 together.

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