Compression pump piston assembly structure

Abstract

The present invention belongs to the technical field of compression pumps for air suspensions. The primary piston guide ring (1003) contacts the inner wall of the moving piston (1104), and the secondary piston guide ring (1103) contacts the inner wall of the pump head (2). When the moving piston assembly (11) moves to the top dead center, the distance between the contact points (12) of the two pistons is the guide distance L. When the moving piston assembly (11) moves to the bottom dead center, the distance between the two contact points (12) is the guide distance L'. The skirt structure (1007) makes L and L' equal when the moving piston assembly (11) moves to the top dead center and the bottom dead center. The compression pump piston assembly structure of the present invention reduces the inclination angle of the moving piston assembly, and the collision force between the primary piston guide ring and the inner wall of the moving piston, and between the secondary piston guide ring and the inner wall of the pump head is also reduced. The guide distance is guaranteed, the guide effect is better, and the smoothness is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of compression pumps for air suspensions, and more specifically, relates to a piston assembly structure of a compression pump for air suspensions. Background Art

[0002] In the compression pump piston assembly structure, the primary piston guide ring contacts the inner wall of the moving piston skirt, and the secondary piston guide ring contacts the inner wall of the pump head, and the distance L between the two contact points is defined as the guide distance. In the compression pump piston assembly structure in the prior art, when the moving piston moves to the bottom dead center, the guide distance L' of the overall structure is significantly shortened compared with the guide distance L at the top dead center, resulting in poor guide effect and smoothness. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in view of the shortcomings of the prior art, a compression pump piston assembly structure with a simple structure is provided, which reduces the inclination angle of the moving piston assembly, reduces the collision force between the first-stage piston guide ring and the moving piston, and between the second-stage piston guide ring and the pump head, and ensures the guide distance, thus improving the guide effect and improving the smoothness of the system.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0005] The present invention discloses a compression pump piston assembly structure. The piston 9 comprises a fixed piston assembly 10 and a moving piston assembly 11. The fixed piston assembly 10 comprises a primary piston guide ring 1005, a fixed piston 1004, a primary piston guide ring 1003, and a primary piston sealing ring 1002. The primary piston guide ring 1005 of the fixed piston assembly 10 is fixed to the end face of a housing 6. The moving piston assembly 11 comprises a moving piston 1104, a secondary piston guide ring 1103, a secondary piston sealing ring 1102, and a valve plate 1101. A pump head 2 is arranged outside the piston 9. The pump head 2 is fixed to the housing 6 together with the primary piston guide ring 1005 of the fixed piston assembly 10. The primary piston guide ring 1003 comprises a skirt structure 1007. A groove 1013 is provided on the first-stage piston guide ring 1005, and the first-stage piston guide ring 1003 also has a cutout 1008. The notch 1009 of the first-stage piston guide ring 1003 corresponds to the position of the protrusion 1010 of the opening 1012 clamped on the first-stage piston guide ring 1005. The first-stage piston guide ring 1003 is located on the outer ring of the first-stage piston guide ring 1005, the first-stage piston guide ring 1003 is in contact with the inner wall of the moving piston 1104, and the second-stage piston guide ring 1103 is in contact with the inner wall of the pump head 2. When the moving piston assembly 11 moves to the upper dead center, the distance between the contact points 12 of the two pistons is the guide distance L, and when the moving piston assembly 11 moves to the lower dead center, the distance between the two contact points 12 is the guide distance L'. The skirt structure 1007 makes L and L' equal when the moving piston assembly 11 moves to the upper dead center and the lower dead center.

[0006] The diameter of the first-stage piston guide ring 1003 is d 1 , the inner diameter of the skirt of the moving piston 1104 is D 1 , the diameter of the secondary piston guide ring 1103 is d 2 , the inner diameter of pump head 2 is D 2 , the clearance between the secondary piston guide ring 1103 and the pump head 2 is δ 2 , the clearance between the primary piston guide ring 1003 and the moving piston 1104 is δ 1 , δ 1 =(D 1 -d 1 ) / 2, δ 2 =(D 2 -d 2 ) / 2.

[0007] The first-stage piston guide ring 1005 is provided with a groove 1013 that matches the notch 1009 of the first-stage piston guide ring 1003. The central angle of the skirt of the groove 1013 is a, and the angle corresponding to the skirt of the first-stage piston guide ring 1003 is b, and a>b.

[0008] The incision 1008 is an oblique incision or a straight incision.

[0009] The included angle between the cutout 1008 and the edge 1011 is α, 0<α≤90.

[0010] When the moving piston assembly 11 moves toward the top dead center, the cutout 1008 is subjected to a rightward gas force F 气 , F 气 Decomposed into a force F parallel to the cutout 1008 1 and the force F of the vertical cut 1008 2 , in F 2 Under the action of, the first-stage piston guide ring 1003 rotates downward.

[0011] When the moving piston assembly 11 moves to the bottom dead center, it is subjected to a leftward gas force F 气 ’ , F 气 ’ Decomposed into a force F parallel to the cutout 1008 1 ’ and the force F of the vertical cut 1008 2 ’ , in F 2 ’ Under the action of , the first-stage piston guide ring 1003 rotates upward, and because a>b, the first-stage piston guide ring 1003 rotates back and forth relative to the groove 1013.

[0012] There is a matching gap between the first-stage piston guide ring 1003 and the inner wall of the skirt of the moving piston 1104, and there is a matching gap between the second-stage piston guide ring 1103 and the pump head 2. The moving piston assembly 11 swings when it reciprocates in the pump head 2. During the working process, the axis of the moving piston assembly 11 does not coincide with the axis of the inner hole of the pump head 2, and an angle is generated. The angle between the moving piston assembly and the axis of the inner hole of the pump head, that is, the inclination angle of the moving piston assembly is θ.

[0013] The pump head is connected to the drying unit, the drying unit is provided with a solenoid valve, the moving piston assembly further comprises a valve plate II, and the fixed piston assembly further comprises a valve plate I.

[0014] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0015] The improvement of the compression pump piston assembly structure described in the present invention is reflected in the following aspects: 1. A primary piston guide ring with a skirt structure is adopted. When the primary piston guide ring is fitted with the primary piston guide ring, the primary piston guide ring is fitted in the position of the groove to achieve position limiting. At the same time, the notch on the primary piston guide ring can avoid the opening on the primary piston guide ring. 2. In the structure of the present invention, the skirt structure makes the guide distance length unchanged when the moving piston moves between the upper dead center and the lower dead center. Therefore, the inclination angle of the moving piston assembly is reduced, and the collision force between the primary piston guide ring and the inner wall of the moving piston, and the secondary piston guide ring and the inner wall of the pump head is also reduced, so the guiding effect is better and the system smoothness is better. 3. The center angle corresponding to the skirt of the groove on the primary piston guide ring is larger than the center angle corresponding to the skirt of the primary piston guide ring. Under the action of gas force, the primary piston guide ring can rotate back and forth in a small range relative to the groove to avoid eccentric wear and make the wear more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following is a brief description of the contents and symbols in the drawings of this specification:

[0017] Figure 1 It is a schematic structural diagram of the compression pump for air suspension according to the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of the compression pump for air suspension according to the present invention;

[0019] Figure 3 It is a schematic diagram of the exploded structure of the piston assembly of the compression pump for air suspension according to the present invention;

[0020] Figure 4 This is a schematic structural diagram of the first-stage piston guide ring of the present invention;

[0021] Figure 5a It is a structural schematic diagram of the movable piston of the air suspension compression pump of the present invention when it moves to the top dead center;

[0022] Figure 5b It is a structural schematic diagram of a compression pump for an air suspension without a skirt structure when the movable piston moves to the top dead center;

[0023] Figure 6a It is a structural schematic diagram of the movable piston of the compression pump for air suspension of the present invention when it moves to the bottom dead center;

[0024] Figure 6b It is a structural schematic diagram of a compression pump for an air suspension without a skirt structure when the movable piston moves to the bottom dead center;

[0025] Figure 7 It is a schematic cross-sectional structural diagram of an air pump of a compression pump for an air suspension according to the present invention;

[0026] Figure 8 A curve diagram showing the change in the inclination angle of the moving piston assembly of the air suspension compression pump of the present invention;

[0027] Fig. 9 A curve diagram showing the variation of the collision force on the inner wall of the moving piston of the compression pump for air suspension of the present invention;

[0028] Fig.10 A curve diagram showing the variation of the collision force on the inner wall of the pump head of the air suspension compression pump of the present invention;

[0029] Fig.11a It is a schematic diagram of the assembly structure of the fixed piston assembly of the compression pump for air suspension according to the present invention;

[0030] Fig.11b It is a schematic diagram of the assembly structure of the fixed piston assembly of the compression pump for air suspension according to the present invention;

[0031] Fig.12a It is a schematic diagram of the force of the cutout on the primary piston guide ring of the air suspension compression pump of the present invention moving toward the top dead center;

[0032] Figure 12b A schematic diagram of the force of the cutout on the primary piston guide ring of the air suspension compression pump of the present invention moving toward the bottom dead center;

[0033] The marks in the accompanying drawings are: 1. air inlet nozzle; 2. pump head; 3. drying unit; 4. solenoid valve; 5. back cover; 6. housing; 7. motor; 8. crank-connecting rod mechanism; 9. piston; 10. fixed piston assembly; 11. moving piston assembly; 12. contact point. DETAILED DESCRIPTION

[0034] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:

[0035] As attached Figure 1-12bAs shown, the present invention is a compression pump piston assembly structure, the compression pump for air suspension comprises a shell 6, the shell 6 is connected to the air intake nozzle 1, a motor 7 and a crank-connecting rod mechanism 8 are arranged in the shell 6, the motor 7 is fixed on the rear cover 5, the crank-connecting rod mechanism 8 is pinned with the piston 9, the piston 9 comprises a fixed piston assembly 10 and a moving piston assembly 11, the fixed piston assembly 10 comprises a primary piston guide ring 1005, a fixed piston 1004, a primary piston guide ring 1003, and a primary piston sealing ring 1002, the primary piston guide ring 1005 of the fixed piston assembly 10 is fixed on the end face of the shell 6, the moving piston assembly 11 comprises a moving piston 1104, a secondary piston guide ring 1103, a secondary piston sealing ring 1102, and a valve plate 1101, a pump head 2 is arranged outside the piston 9, the pump head 2 is fixed on the shell 6 together with the primary piston guide ring 1005 of the fixed piston assembly 10, the primary piston The guide ring 1003 includes a skirt structure 1007, a groove 1013 is arranged on the primary piston guide ring 1005, and the primary piston guide ring 1003 also has a cutout 1008. The cutout 1009 of the primary piston guide ring 1003 corresponds to the position of the protrusion 1010 of the opening 1012 clamped on the primary piston guide ring 1005. The primary piston guide ring 1003 is located on the outer ring of the primary piston guide ring 1005, the primary piston guide ring 1003 contacts the inner wall of the moving piston 1104, and the secondary piston guide ring 1103 contacts the inner wall of the pump head 2. When the moving piston assembly 11 moves to the upper dead center, the distance between the contact points 12 of the two pistons is the guide distance L, and when the moving piston assembly 11 moves to the lower dead center, the distance between the two contact points 12 is the guide distance L'. The skirt structure 1007 makes L and L' equal when the moving piston assembly 11 moves to the upper dead center and the lower dead center. The above structure proposes an improved technical solution to address the deficiencies in the prior art. The improvements of the present invention are as follows: 1. A first-level piston guide ring with a skirt structure is used. When the first-level piston guide ring is fitted with the first-level piston guide ring, the first-level piston guide ring is fitted in the position of the groove to achieve positioning. At the same time, the notch on the first-level piston guide ring can avoid the opening on the first-level piston guide ring. 2. The structure of the present invention, the skirt structure makes the guide distance length unchanged when the moving piston moves between the upper dead center and the lower dead center. Therefore, the inclination angle of the moving piston assembly is reduced. At the same time, the collision force between the first-level piston guide ring and the inner wall of the moving piston, and the second-level piston guide ring and the inner wall of the pump head is also reduced, resulting in better guiding effect and better system smoothness. 3. The center angle corresponding to the skirt of the groove on the first-level piston guide ring is larger than the center angle corresponding to the skirt of the first-level piston guide ring. Under the action of gas force, the first-level piston guide ring can rotate back and forth in a small range relative to the groove to avoid eccentric wear and make the wear more uniform. The compression pump piston assembly structure described in the present invention has a simple structure, which reduces the inclination angle of the moving piston assembly, and also reduces the collision force between the primary piston guide ring and the inner wall of the moving piston, and between the secondary piston guide ring and the inner wall of the pump head. The guide distance is guaranteed, the guide effect is better, and the smoothness is improved.

[0036] The diameter of the first-stage piston guide ring 1003 is d 1 , the inner diameter of the skirt of the moving piston 1104 is D 1 , the diameter of the secondary piston guide ring 1103 is d 2 , the pump head (2) has a diameter of D 2 , the clearance between the secondary piston guide ring (1103) and the pump head (2) is δ 2 , the clearance between the primary piston guide ring (1003) and the moving piston (1104) is δ 1 , δ 1 =(D 1 -d 1 ) / 2, δ 2 =(D 2 -d 2 ) / 2. There is a matching gap between the primary piston guide ring (1003) and the inner wall of the skirt of the moving piston 1104, and there is a matching gap between the secondary piston guide ring 1103 and the pump head 2. The moving piston assembly 11 swings when it reciprocates in the pump head 2. During the working process, the axis of the moving piston assembly 11 does not coincide with the axis of the inner hole of the pump head 2, and an angle is generated. The angle between the moving piston assembly and the axis of the inner hole of the pump head, that is, the inclination angle of the moving piston assembly is θ. To further illustrate the improved innovation and advantages of the present invention, a specific example is given as follows: a dynamic simulation of an air pump is performed. δ 1 = δ 2 =0.2mm, the motor rotates two times, when the skirt structure is not used θ The maximum value is 0.7564°, corresponding to the first-stage piston guide ring with skirt structure θ The maximum value is 0.5675°. The maximum inclination angle is reduced by 24.97%. The inclination angle of the moving piston assembly changes as follows Figure 8 When the moving piston assembly swings, the primary piston guide ring collides with the inner wall of the moving piston skirt, and the secondary piston guide ring collides with the inner wall of the pump head. The maximum collision force of the collision between the inner wall of the moving piston skirt without the skirt structure is 1990.85N, and the maximum collision force of the primary piston guide ring with the skirt structure is 1302.47N. Fig. 9 As shown in the figure. The maximum collision force between the inner wall of the pump head without the skirt structure is 1625.68N, and the maximum collision force between the first-stage piston guide ring with the skirt structure is 1011.19N. Fig.10Compared with the prior art that does not adopt the skirt structure, after the improvement of the present invention is implemented, the guide distance is guaranteed, the stability of the movement of the moving piston assembly is enhanced, the swing is reduced, the inclination angle is reduced, and the collision force is also reduced accordingly.

[0037] The first-stage piston guide ring 1005 is provided with a groove 1013 that matches the notch 1009 of the first-stage piston guide ring 1003. The central angle of the skirt of the groove 1013 is a, and the angle corresponding to the skirt of the first-stage piston guide ring 1003 is b, and a>b. With the above structure, the force analysis of the cutout of the first-stage piston guide ring in the fixed piston assembly is carried out. As shown in FIG12, when the moving piston assembly moves to the upper dead center, the cutout is subjected to the rightward gas force F 气 , F 气 It can be decomposed into the force F parallel to the cut 1 and the vertical cut force F 2 , in F 2 Under the action of the first-stage piston guide ring, the first-stage piston guide ring rotates downward. When the moving piston assembly moves to the bottom dead center, it is subjected to the left gas force F. 气 ’ , F 气 ’ It can be decomposed into the force F parallel to the cut 1 ’ and the vertical cut force F 2 ’ , in F 2 ’ Under the action of , the first-stage piston guide ring rotates upward. Since a>b, the first-stage piston guide ring can rotate back and forth in a small range relative to the groove, which can prevent eccentric wear and make the wear more uniform.

[0038] The cutout 1008 is an oblique cutout, a straight cutout or a lap cutout. The angle between the cutout 1008 and the edge 1011 is α. 0<α≤90. When the moving piston assembly 11 moves toward the top dead center, the cutout 1008 is subjected to a rightward gas force F 气 , F 气 Decomposed into a force F parallel to the cutout 1008 1 and the force F of the vertical cut 1008 2 , in F 2 Under the action of the first-stage piston guide ring 1003, the first-stage piston guide ring 1003 rotates downward. When the moving piston assembly 11 moves to the bottom dead center, it is subjected to the left gas force F 气 ’ , F 气 ’ Decomposed into a force F parallel to the cutout 1008 1 ’ and the force F of the vertical cut 1008 2 ’ , in F2 ’ Under the action of , the first-stage piston guide ring 1003 rotates upward. Since a>b, the first-stage piston guide ring 1003 can rotate back and forth relative to the groove 1013.

[0039] The pump head 2 is connected to the drying unit 3, and the drying unit 3 is provided with a solenoid valve 4. The moving piston assembly 11 further includes a valve plate II 1101. The fixed piston assembly 10 further includes a valve plate I 1001.

[0040] To sum up, the structure of the present invention proposes a first-level piston guide ring with a skirt structure, which is provided with a cut (which can be an oblique cut or a straight cut), the angle between the cut and the edge is α, 0<α≤90, the skirt structure can avoid the opening on the first-level piston guide ring, and a protrusion is provided on the edge of the opening. At the same time, a groove arranged along the circumference of the piston guide ring is arranged on the first-level piston guide ring. When the first-level piston guide ring is connected to the first-level piston guide ring, the first-level piston guide ring cooperates with the groove, so that the position of the first-level piston guide ring can be limited to prevent the first-level piston guide ring from rotating unlimitedly relative to the first-level piston guide ring. FIG5 is a schematic diagram of the guide of the moving piston assembly at the top dead center. The first-stage piston guide ring contacts the inner wall of the moving piston, and the second-stage piston guide ring contacts the inner wall of the pump head. The first-stage piston guide ring contacts the inner wall of the moving piston at one contact point, and the second-stage piston guide ring contacts the inner wall of the pump head at one contact point. The distance L between the two contact points is defined as the guide distance. Whether the skirt structure is used when the moving piston assembly moves to the top dead center has no obvious effect on the guide distance. When the moving piston assembly moves to the bottom dead center, as shown in FIG6, the guide distance L without the skirt structure is ’ Compared with the guide distance L at the top dead center, it is significantly shorter and the guiding effect is worse. The guide distance L of the skirt structure is ’ It is consistent with the top dead center, and the guiding effect is better. When the skirt structure is not used, the moving piston moves between the upper and lower dead points, and the guiding distance is variable. The use of the skirt structure can ensure the guiding distance during movement, can better play a guiding role, and the system is smoother.

[0041] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A compression pump piston assembly structure, characterized in that: The piston (9) comprises a fixed piston assembly (10) and a moving piston assembly (11); the fixed piston assembly (10) comprises a primary piston guide ring (1005), a fixed piston (1004), a primary piston guide ring (1003), and a primary piston sealing ring (1002); the primary piston guide ring (1005) of the fixed piston assembly (10) is fixed to the end surface of the housing (6); the moving piston assembly (11) comprises a moving piston (1104), a secondary piston guide ring (1103), and a secondary piston sealing ring (1102); a pump head (2) is arranged outside the piston (9); the pump head (2) and the primary piston guide ring (1005) of the fixed piston assembly (10) are fixed to the housing (6); the primary piston guide ring (1003) comprises a skirt structure (1007); a groove (1013) is arranged on the primary piston guide ring (1005); The guide ring (1003) is provided with a notch (1008), the notch (1009) of the primary piston guide ring (1003) corresponds to the position of the protrusion (1010) of the opening (1012) clamped on the primary piston guide ring (1005), the primary piston guide ring (1003) is located on the outer ring of the primary piston guide ring (1005), the primary piston guide ring (1003) contacts the inner wall of the moving piston (1104), and the secondary piston guide ring (1103) contacts the inner wall of the pump head (2). When the moving piston assembly (11) moves to the top dead center, the distance between the contact points (12) of the two pistons is the guide distance L, and when the moving piston assembly (11) moves to the bottom dead center, the distance between the two contact points (12) is the guide distance L'. The skirt structure (1007) ensures that L and L' are equal when the moving piston assembly (11) moves to the top dead center and the bottom dead center.

2. The compression pump piston assembly structure according to claim 1, characterized in that: The diameter of the first-stage piston guide ring (1003) is d1, the inner diameter of the skirt of the moving piston (1104) is D1, the diameter of the second-stage piston guide ring (1103) is d2, the inner diameter of the pump head (2) is D2, and the matching clearance between the second-stage piston guide ring (1103) and the pump head (2) is δ 2. The clearance between the primary piston guide ring (1003) and the moving piston (1104) is δ 1, δ 1=(D1-d1) / 2, δ 2=(D2-d2) / 2.

3. The compression pump piston assembly structure according to claim 1, characterized in that: The first-stage piston guide ring (1005) is provided with a groove (1013) that matches the notch (1009) of the first-stage piston guide ring (1003), the center angle of the skirt of the groove (1013) is a, the angle corresponding to the skirt of the first-stage piston guide ring (1003) is b, and a>b.

4. The compression pump piston assembly structure according to claim 1, characterized in that: The incision (1008) is an oblique incision or a straight incision.

5. The compression pump piston assembly structure according to claim 1, characterized in that: The included angle between the incision (1008) and the edge (1011) is α, 0<α≤90.

6. The compression pump piston assembly structure according to claim 3, characterized in that: When the moving piston assembly (11) moves toward the top dead center, the cutout (1008) is subjected to a rightward gas force F 气 , F 气 It is decomposed into a force F1 parallel to the cutout (1008) and a force F2 perpendicular to the cutout (1008). Under the action of F2, the first-stage piston guide ring (1003) rotates downward.

7. The compression pump piston assembly structure according to claim 6, characterized in that: When the moving piston assembly (11) moves toward the bottom dead center, it is subjected to a gas force F to the left. 气 ’ , F 气 ’ Decomposed into a force F1 parallel to the cut (1008) ’ and the force F2 perpendicular to the cut (1008) ’ , in F2 ’ Under the action of, the first-stage piston guide ring (1003) rotates upward, and because a>b, the first-stage piston guide ring (1003) rotates back and forth relative to the groove (1013).

8. The compression pump piston assembly structure according to claim 1, characterized in that: There is a matching clearance between the first-stage piston guide ring (1003) and the inner wall of the skirt of the moving piston (1104), and there is a matching clearance between the second-stage piston guide ring (1103) and the pump head (2). When the moving piston assembly (11) reciprocates in the pump head (2), it swings. During the working process, the axis of the moving piston assembly (11) does not coincide with the axis of the inner hole of the pump head (2), and an angle is generated. The angle between the moving piston assembly and the axis of the inner hole of the pump head is θ.

9. The compression pump piston assembly structure according to claim 1, characterized in that: The pump head (2) is connected to a drying unit (3), the drying unit (3) is provided with a solenoid valve (4), the moving piston assembly (11) further comprises a valve plate II (1101), and the fixed piston assembly (10) further comprises a valve plate I (1001).

Images