Air pump for air suspension

Abstract

The present invention belongs to the technical field of compressed air supply equipment for vehicles, and is an air pump for air suspension. A motor (8) is provided with an output shaft (801), the output shaft (801) is rotatably connected to a connecting rod (9), a moving piston (10) is connected to the connecting rod (9), an air outlet channel (1001) is provided on the moving piston (10), a fixed piston assembly (11) is provided on the end surface of a housing (7), the moving piston (10) and the fixed piston assembly (11) form a primary compression chamber (14), a pump head (2) and the fixed piston assembly (11) are fixed together on the end surface of the housing (7), the moving piston (10) and the inner wall of the pump head (2) form a secondary compression chamber (15), one end of the secondary compression chamber (15) is provided with an exhaust hole (1501), and the exhaust hole (1501) is connected to a drying unit (3). The air pump for air suspension of the present invention is reliable in control, the piston is placed inside the housing to form a primary compression chamber and a secondary compression chamber, the structure is compact, the efficiency is improved, and the processing is convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of compressed air supply equipment for vehicles, and more specifically, relates to an air pump for air suspension. Background Art

[0002] In the prior art, there is a compressed air supply device that uses compressed air flow to operate pneumatic equipment. Pneumatic equipment, especially air spring equipment for vehicles, has high requirements for layout and use. The compressed air supply device in the prior art usually has a two-stage compression cylinder, in which the first-stage compression cylinder and the second-stage compression cylinder are both composed of a piston and the inner wall of an external component. The piston is placed inside the external component, the space utilization rate is not high, and the piston structure is relatively complex and difficult to process.

[0003] In the prior art, there is a technology named "A Noise Reduction Device for an Air Pump and an Air Suspension System" and with a publication number of "114370388A", which includes two symmetrically arranged outer shells, which are matched and fixed to each other to form a receiving cavity; the air pump is installed in the receiving cavity; the inner layer of each outer shell is provided with sound-absorbing cotton of the same shape and a vibration-damping pad formed by processing an asphalt plate, and the sound-absorbing cotton is located in the inner layer of the vibration-damping pad; the outer shell, the vibration-damping pad and the sound-absorbing cotton are all provided with a plurality of aligned hanging holes, one of the outer shells is provided with a plurality of vibration-damping ears for fixing the chassis of the automobile, and each vibration-damping ear passes through a group of aligned hanging holes; the outer shell and the vibration-damping pad are both provided with a plurality of heat dissipation holes. However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the shortcomings of the prior art, an air pump for air suspension is provided which has a simple structure, reliable control, a piston placed inside an outer shell, forms a structure of a primary compression chamber, a secondary compression chamber and a third cylinder, has a compact structure and improves the air intake efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0006] The present invention discloses an air pump for air suspension, comprising a shell, wherein a motor and an air cavity are arranged in the shell, the air cavity is connected to an air inlet nozzle, the motor is fixed on a rear cover, the motor is provided with an output shaft, the output shaft is rotatably connected to a connecting rod, a moving piston is connected to the connecting rod, an air outlet channel is arranged on the moving piston, a fixed piston assembly is arranged on the end face of the shell, the fixed piston assembly comprises a primary piston guide ring and a fixed piston, an air inlet is arranged on the end face of the fixed piston, the moving piston and the fixed piston of the fixed piston assembly form a primary compression chamber, a pump head is arranged outside the fixed piston assembly, the pump head and the primary piston guide ring of the fixed piston assembly are fixed on the end face of the shell together, the moving piston and the inner wall of the pump head form a secondary compression chamber, an exhaust hole is arranged at one end of the secondary compression chamber, the exhaust hole is connected to a drying unit, the drying unit is provided with a solenoid valve, an exhaust channel is arranged inside the drying unit, and the air flowing into the air cavity from the air inlet nozzle is arranged to flow into the primary compression chamber via the air inlet, flow into the secondary compression chamber via the air outlet channel, and then be filtered by the drying unit through the exhaust hole and discharged through the exhaust channel.

[0007] The air pump for the air suspension is provided with valve sheets at the air inlet and the outlet of the air outlet channel respectively, and a one-way valve is provided at the air outlet.

[0008] The skirt end surface of the moving piston is also provided with an air inlet hole.

[0009] The pump head is provided with an air inlet channel, and a one-way valve is provided at the inlet of the air inlet channel.

[0010] The output shaft of the motor is an eccentric shaft.

[0011] The moving piston of the air pump of the air suspension is pin-connected with the connecting rod, and the fixed piston assembly is bolt-connected with the housing.

[0012] The end surface of the fixed piston is provided with a plurality of air inlets.

[0013] A plurality of air inlet holes can be arranged on the end surface of the skirt of the moving piston, and the air inlet holes are provided with valve sheets.

[0014] When the air pump for the air suspension is working, the motor rotates, and is configured to form a crank-connecting rod structure through an eccentric output shaft and a connecting rod during rotation, thereby driving the moving piston to perform reciprocating motion.

[0015] The end surface of the skirt of the moving piston and the pump head form a third cylinder.

[0016] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0017] The air pump for air suspension of the present invention has a simple structure and reliable control. The piston is placed inside the shell to form a structure of a primary compression chamber, a secondary compression chamber and a third cylinder. The structure is compact and the air intake efficiency is improved. The overall performance of the air pump is effectively improved through the structural improvements of the two embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following is a brief description of the contents and symbols in the drawings of this specification:

[0019] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the air pump for air suspension according to the present invention;

[0020] Figure 2 This is a schematic structural diagram of Embodiment 1 of the air pump for air suspension of the present invention;

[0021] Figure 3 It is a cross-sectional structural schematic diagram of Embodiment 1 of the air pump for air suspension of the present invention;

[0022] Figure 4 It is a partial enlarged structural schematic diagram of Embodiment 1 of the air pump for air suspension of the present invention;

[0023] Figure 5 Schematic diagram of the overall structure of the air pump for air suspension according to the second embodiment of the present invention;

[0024] Figure 6 It is a cross-sectional structural schematic diagram of Embodiment 2 of the air pump for air suspension according to the present invention;

[0025] Figure 7 It is a partial structural schematic diagram of Embodiment 2 of the air pump for air suspension of the present invention;

[0026] Figure 8 A comparison chart of pressure change data in the air pipe of the air pump for air suspension of the present invention and the air pump in the prior art;

[0027] The marks in the accompanying drawings are respectively: 1. air inlet nozzle; 2. pump head; 201, air inlet channel; 3. drying unit; 4. solenoid valve; 5. exhaust channel; 6. back cover; 7. housing; 701, air cavity; 8. motor; 801, output shaft; 9. connecting rod; 10. moving piston; 1001, air outlet channel; 1002, air inlet hole; 11. fixed piston assembly; 12. primary piston guide ring; 13. fixed piston; 1301, air inlet port; 14. primary compression chamber; 15. secondary compression chamber; 1501, exhaust hole; 16. one-way valve; 17. valve plate; 18. third cylinder. DETAILED DESCRIPTION

[0028] 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:

[0029] As attached Figure 1 , Attachment Figure 2 As shown, the present invention is an air pump for air suspension, including a housing 7, a motor 8 and an air cavity 701 are arranged in the housing 7, the air cavity 701 is connected to the air inlet nozzle 1, the motor 8 is fixed on the rear cover 6, the motor 8 is provided with an output shaft 801, the output shaft 801 is rotatably connected to the connecting rod 9, the moving piston 10 is connected to the connecting rod 9, the moving piston 10 is provided with an air outlet channel 1001, the end surface of the housing 7 is provided with a fixed piston assembly 11, the fixed piston assembly 11 includes a primary piston guide ring 12, a fixed piston 13, the end surface of the fixed piston 13 is provided with an air inlet 1301, the moving piston 10 and the fixed piston assembly 11 constitute a primary compression chamber 14, the fixed piston assembly 11 is external A pump head 2 is provided, and the pump head 2 is fixed on the end face of the housing 7 together with the primary piston guide ring 12 of the fixed piston assembly 11. The moving piston 10 and the inner wall of the pump head 2 form a secondary compression chamber 15. An exhaust hole 1501 is provided at one end of the secondary compression chamber 15. The exhaust hole 1501 is connected to the drying unit 3. The drying unit 3 is provided with a solenoid valve 4. The drying unit 3 is provided with an exhaust channel 5. The air flowing into the air chamber 701 from the air inlet nozzle 1 is set to be able to flow into the primary compression chamber 14 through the air inlet 1301, flow into the secondary compression chamber 15 through the air outlet channel 1001, and then pass through the exhaust hole 1501 through the drying unit 3 and be discharged through the exhaust channel 5. The above structure proposes an improved technical solution to address the deficiencies in the prior art. The air pump for air suspension described in the present invention has a simple structure and reliable control. The piston is placed inside the housing to form a primary compression chamber and a secondary compression chamber. The structure is compact, the efficiency is improved, and the processing is convenient.

[0030] The end surface of the fixed piston 13 is provided with a plurality of air inlets 1301. The above structure and the arrangement of a plurality of air inlets are used to improve the air intake efficiency and effectively meet the working requirements of the air pump.

[0031] As attached Figure 3 , Attachment Figure 4As shown, as embodiment 1, the air pump for air suspension is provided with valve plates 17 at the air inlet 1301 and the outlet of the air outlet channel 1001, respectively, and a one-way valve 16 is provided at the exhaust hole 1501. When the air pump for air suspension is working, the motor 8 rotates, and the motor 8 is provided with an output shaft 801, and the output shaft 801 is an eccentric shaft. The output shaft 801 is rotatably connected with the connecting rod 9, and the connecting rod 9 is pinned with the moving piston 10. The motor 8 rotates to drive the connecting rod 9, and then drives the moving piston 10 to reciprocate. The moving piston 10 is provided with an air outlet channel 1001, and the end surface of the housing 7 is provided with a fixed piston assembly 11. The fixed piston assembly 11 includes a primary piston guide ring 12 and a fixed piston 13. The end surface of the fixed piston 13 is provided with an air inlet 1301. The moving piston 10 and the fixed piston assembly 11 constitute a primary compression chamber 14. The fixed piston assembly is provided with a pump head 2 outside, and the pump head 2 is connected to the fixed piston 13. The fixed piston assembly 11 is fixed together on the end face of the housing 7, the moving piston 10 and the inner wall of the pump head 2 form a secondary compression chamber 15, one end of the secondary compression chamber 15 is provided with an exhaust hole 1501, the exhaust hole 15 is connected to the drying unit 3, the drying unit is provided with a solenoid valve 4, the drying unit is provided with an exhaust channel 5, the air inlet 1301 and the outlet of the air outlet channel 1001 are provided with a valve sheet 17, and the exhaust hole 1501 is provided with a one-way valve 16. The air flowing into the air chamber 701 from the air inlet nozzle 1 flows into the primary compression chamber 14 through the air inlet 1301, flows into the secondary compression chamber 15 through the air outlet channel 1001, and is filtered by the drying unit 3 through the exhaust hole 1501 and discharged through the exhaust channel 5. The above structure is improved, the moving piston assembly is pinned with the connecting rod, the fixed piston assembly is fixed on the housing, the moving piston assembly and the fixed piston assembly form a primary compression chamber, and the moving piston and the inner wall of the pump head form a secondary compression chamber, which greatly utilizes the pump head space and has a compact structure. The moving piston has a simple structure, is easy to process, and has good processability.

[0032] As attached Figure 5 -Attached Figure 7As shown, as embodiment 2, the skirt end face of the moving piston 10 is also provided with an air inlet hole 1002. The pump head 2 is provided with an air inlet channel 201, and a one-way valve 16 is provided at the inlet of the air inlet channel 201. A plurality of air inlet holes 1002 can be arranged on the skirt end face of the moving piston 10. When the air pump for air suspension is working, the motor 8 rotates, and the motor 8 is provided with an output shaft 801, which is an eccentric shaft, and the output shaft 801 is rotatably connected with the connecting rod 9, and the connecting rod 9 is pin-connected with the moving piston 10. The motor 8 rotates to drive the connecting rod 9, and then drives the moving piston 10 to reciprocate. The moving piston 10 is provided with an air outlet channel 1001, and the skirt end face is provided with an air inlet hole 1002, and the air inlet hole 1002 is provided with a valve plate 17. The end face of the housing 7 is provided with a fixed piston assembly 11, which includes a primary piston guide ring 12 and a fixed piston 13. The end face of the fixed piston 13 is provided with an air inlet 1301. The moving piston assembly and the fixed piston assembly 11 constitute a primary compression chamber 14. The gas flowing in from the air inlet nozzle 1 enters the primary compression chamber 14 from the air inlet 1301 and the air inlet hole 1002 on the end face of the skirt of the moving piston 10 respectively. A pump head 2 is provided outside the fixed piston assembly 11. The pump head 2 is provided with an air inlet channel 201, and the pump head 2 is fixed to the end face of the housing 7 together with the fixed piston assembly 11. The moving piston 10 and the pump head 2 constitute a secondary compression chamber 15. The gas in the primary compression chamber 14 reaches the secondary compression chamber 15 through the air outlet channel 1001. Cavity 15, an exhaust hole 1501 is provided at one end of the secondary compression cavity 15, the exhaust hole 1501 is connected to a drying unit 3, the drying unit is provided with a solenoid valve 4, an exhaust channel 5 is provided inside the drying unit, a one-way valve 16 is provided at the inlet of the air inlet channel 201 and the exhaust hole 1501, a valve sheet 17 is provided at the air inlet 1301, the air inlet hole 1002 and the outlet of the air outlet channel 1001, so that the air entering the air cavity 701 from the air inlet nozzle 1 flows into the primary compression cavity 14 through the air inlet channel 201, the air inlet 1301 and the air inlet hole 1002, and then flows into the secondary compression cavity 15 through the air outlet channel 1001, enters the drying unit 3 through the exhaust hole 1501, is filtered, and is finally discharged through the exhaust channel 5. At the same time, in order to further improve the performance of the air pump, the end face of the moving piston skirt and the inner wall of the pump head form a third cylinder 18. The end face of the moving piston skirt is provided with an air inlet hole (this hole is not present in Example 1). As the moving piston reciprocates, the air in the third cylinder is assisted in compression. In the absence of an air inlet hole, the air in the third cylinder is meaninglessly and frequently compressed. After the air inlet hole is added, the gas in the third cylinder can enter the primary compression chamber from the air inlet hole on the end face of the moving piston skirt, thus avoiding energy waste and improving the inflation efficiency. The performance of the air pump was tested using a test device. A 3.7L gas tank was inflated within 150 seconds. The air pump without an air inlet hole (i.e., the structure in Example 1) had a pressure of 20.44 bar in the gas tank at 150 seconds. The air pump of Example 2 with an air inlet hole had a pressure of 24.08 bar in the gas tank at 150 seconds. The pressure in the gas tank changes as shown in the figure. Figure 7As described. Test data proves that an air inlet hole is provided, and the air in the third cylinder is used for auxiliary compression, which can greatly increase the inflation efficiency. In this way, the working efficiency and performance of the air pump are effectively improved. Through the structural improvement of Example 2, the performance is further improved, the moving piston assembly is pinned to the connecting rod, the fixed piston assembly is fixed to the outer casing, the moving piston assembly and the fixed piston assembly constitute a primary compression chamber, and the moving piston and the inner wall of the pump head constitute a secondary compression chamber, which greatly utilizes the internal space of the pump head and has a compact structure. The moving piston has a simple structure, is easy to process, and has good processability. A number of air inlets can be arranged on the end face of the fixed piston, and an air inlet hole is provided on the end face of the skirt of the moving piston. The number of air inlets can also be set to a number, and air is taken in from both sides, which improves the inflation efficiency. Figure 8 The data comparison can clearly reflect the technical advantages of this application.

[0033] The output shaft 801 of the motor 8 is an eccentric shaft. The moving piston 10 of the air pump for the air suspension is pin-connected with the connecting rod 9, and the fixed piston assembly 11 is bolt-connected with the housing 7.

[0034] When the air pump for the air suspension is working, the motor 8 rotates, and is configured to form a crank-connecting rod structure with the connecting rod 9 through the eccentric output shaft 801 during rotation, thereby driving the moving piston 10 to perform reciprocating motion. In the above structure, when the motor rotates, the eccentric shaft drives the connecting rod, the connecting rod moves, and then drives the moving piston to move.

[0035] The air pump for air suspension described in the present invention has the following innovations: the piston part is divided into a moving piston and a fixed piston assembly, the moving piston is pinned to the connecting rod, the fixed piston assembly is fixed to the outer shell, the moving piston and the fixed piston assembly constitute a primary compression chamber, and the moving piston and the inner wall of the pump head constitute a secondary compression chamber, which greatly utilizes the pump head space and has a compact structure. The moving piston has a simple structure, is easy to process, and has good processability. A number of air inlets 1301 can be arranged on the end face of the fixed piston 13, which improves the air pumping efficiency. Embodiment 2 is improved on the basis of Embodiment 1, the pump head 2 is provided with an air inlet channel 201, the inlet of the air inlet channel 201 is provided with a one-way valve 16, the end face of the moving piston skirt and the pump head constitute a third cylinder, the end face of the moving piston skirt is provided with an air inlet hole, as the moving piston reciprocates, the air in the auxiliary compression chamber is compressed, and the air enters the primary compression chamber from the air inlet hole on the end face of the moving piston skirt, which avoids energy waste and improves the air pumping efficiency. The fixed piston end surface can be provided with a plurality of air inlets, and the moving piston skirt end surface is provided with air inlets, and the number of air inlets can also be set to a plurality of air inlets, and air is taken in from both sides, thereby improving the pumping efficiency. In summary, the air pump for air suspension described in the present invention has a simple structure, reliable control, compact structure, improved air intake efficiency, and effectively improved the overall performance of the air pump.

[0036] The present invention is described exemplarily above 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. An air pump for an air suspension, characterized in that: The invention comprises a housing (7), wherein a motor (8) and an air chamber (701) are arranged in the housing (7), wherein the air chamber (701) is connected to an air inlet nozzle (1), wherein the motor (8) is fixed on a rear cover (6), wherein the motor (8) is provided with an output shaft (801), wherein the output shaft (801) is rotatably connected to a connecting rod (9), wherein a moving piston (10) is connected to the connecting rod (9), wherein an air outlet passage (1001) is arranged on the moving piston (10), wherein a fixed piston assembly (11) is arranged on the end surface of the housing (7), wherein the fixed piston assembly (11) comprises a primary piston guide ring (12) and a fixed piston (13), wherein an air inlet (1301) is arranged on the end surface of the fixed piston (13), wherein the moving piston (10) and the fixed piston (13) of the fixed piston assembly (11) form a primary compression chamber (14), and wherein the fixed piston assembly (11) is provided with a A pump head (2) is fixed together with a primary piston guide ring (12) of a fixed piston assembly (11) on an end surface of a housing (7); the moving piston (10) and the inner wall of the pump head (2) form a secondary compression chamber (15); an exhaust hole (1501) is provided at one end of the secondary compression chamber (15); the exhaust hole (1501) is connected to a drying unit (3); the drying unit (3) is provided with a solenoid valve (4); an exhaust channel (5) is provided inside the drying unit (3); air flowing into the air chamber (701) from the air inlet nozzle (1) is configured to flow into the primary compression chamber (14) through the air inlet port (1301), flow into the secondary compression chamber (15) through the air outlet channel (1001), and then pass through the exhaust hole (1501) through the drying unit (3) for filtration and then be discharged through the exhaust channel (5).

2. The air pump for air suspension according to claim 1, characterized in that: The air pump for the air suspension is provided with valve plates (17) at the air inlet (1301) and the outlet of the air outlet channel (1001), respectively, and a one-way valve (16) at the air outlet (1501).

3. The air pump for air suspension according to claim 1, characterized in that: The skirt end surface of the moving piston (10) is also provided with an air inlet hole (1002).

4. The air pump for air suspension according to claim 3, characterized in that: The pump head (2) is provided with an air inlet channel (201), and a one-way valve (16) is provided at the inlet of the air inlet channel (201).

5. The air pump for air suspension according to claim 1 or 2, characterized in that: The output shaft (801) of the motor (8) is an eccentric shaft.

6. The air pump for air suspension according to claim 1 or 2, characterized in that: The moving piston (10) of the air pump for the air suspension is pin-connected to the connecting rod (9), and the fixed piston assembly (11) is bolt-connected to the housing (7).

7. The air pump for air suspension according to claim 4, characterized in that: A plurality of air inlets (1301) are arranged on the end surface of the fixed piston (13).

8. The air pump for air suspension according to claim 3 or 4, characterized in that: A plurality of air inlet holes (1002) may be arranged on the end surface of the skirt of the moving piston (10), and the air inlet holes (1002) are provided with valve plates (17).

9. The air pump for air suspension according to claim 5, characterized in that: When the air pump for the air suspension is working, the motor (8) rotates. The motor (8) is configured to form a crank-connecting rod structure through an eccentric output shaft (801) and a connecting rod (9) when rotating, thereby driving the moving piston (10) to perform reciprocating motion.

10. The air pump for air suspension according to claim 4, characterized in that: The skirt end surface of the moving piston (10) and the pump head (2) form a third cylinder (18).

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