CN114517776A - Portable mini-air compression pump for medical oxygen generator - Google Patents

Abstract

The invention discloses a miniature air compression pump for a portable medical oxygen generator, which belongs to the air and belongs to the syringe pump. It includes a pump casing, a cylinder assembly, a piston assembly, a connecting rod assembly and a motor; the pump casing is composed of a pump body (5) and an end cover (11), and the cylinder assembly is composed of a pump casing, a cylinder liner (3), and a valve plate assembly It is composed of the cylinder head (1), the valve plate assembly is composed of the exhaust reed valve plate (16) fixed on the exhaust valve plate (2) and the exhaust valve hole (9) is blocked; the piston assembly is composed of the piston body (10), an intake valve plate (15), a leather cup (17), and an intake reed valve plate (14); the connecting rod assembly consists of two connecting rods (6) respectively connected with the two piston bodies (10) 2. The eccentric wheel (7) is connected with the two connecting rods (6), and the two connecting rods (6) have an air inlet (18) inside; the motor (4) is fixedly connected with the eccentric wheel (7).

Description

Micro Air Compression Pump for Portable Medical Oxygen Concentrator

technical field

The invention relates to an air compression pump, in particular to a miniature air compression pump for a portable medical oxygen generator, which belongs to a syringe pump.

Background technique

Due to the constraints of space, weight, volume and other factors, the air compression pump of the portable medical oxygen concentrator usually adopts a single-cylinder structure. Its working principle is that the motor is rigidly connected to the eccentric wheel, the intake reed valve plate and the exhaust reed valve plate are installed on the valve plate, the intake port and the exhaust port are arranged on the cylinder head, and the connecting rod is driven by the motor shaft. The piston reciprocates, periodically changing the cylinder volume, compressing the air entering from the intake valve, and then outputting it through the exhaust valve. This kind of air compression pump has problems such as uncompact structure, small flow rate, low efficiency, large noise and vibration.

SUMMARY OF THE INVENTION

In view of the above-mentioned defects in the prior art, the present invention aims to provide a miniature air compression pump for a portable medical oxygen generator with compact structure, large flow rate, high efficiency, and low noise and vibration.

In order to achieve the above purpose, the present invention adopts the following technical scheme: it comprises cylinder assemblies respectively fixed at both ends of the pump casing, piston assemblies located in each of the cylinder assemblies, connecting rod assemblies connected with the two piston assemblies, A motor on the pump casing that drives the movement of the connecting rod assembly.

The pump casing is composed of a pump body with an air inlet on the front, and an end cover tightly fixed at the bottom of the pump body. The cylinder assembly is composed of a cylinder liner that is in communication with the end face of the pump casing, and a cylinder head that seals and compresses one end of the cylinder liner through a valve plate assembly. The valve plate assembly consists of an exhaust valve with an exhaust valve hole on the surface. It consists of a plate and an exhaust reed valve plate which is fixed on the exhaust valve plate and blocks the exhaust valve hole. The piston assembly consists of a piston body located in the cylinder liner in a bowl-like structure, a leather cup pressed against the end face of the piston body through an intake valve plate with four intake valve holes, fixed on the intake valve plate and fixed on the intake valve plate. It is composed of four intake reed valve plates with closed intake valve holes. The connecting rod assembly is composed of two connecting rods which are located in the cavity of the pump casing and are fixedly connected with each piston body respectively, and an eccentric wheel which is connected with the two connecting rods through bearings respectively. The intake port communicated with the cavity of the piston body. The motor is fixedly connected with the eccentric wheel.

In the above technical solution, two transverse grooves and two longitudinal grooves are formed on the surface of the intake reed valve plate, and a gap is formed at the intersection of the two transverse grooves and the two longitudinal grooves.

In the above technical solution, the intake reed valve sheet may also have a "cross"-shaped structure.

In the above technical solution, a filter is fixed in the air inlet.

In the above technical solution, the eccentric wheel is provided with a counterweight block integrally connected with it.

Compared with the prior art, the present invention has the following advantages due to the adoption of the above-mentioned technical solutions:

1) The double-cylinder structure with two rows of cylinders facing each other is adopted, which can not only effectively ensure the balance of the reciprocating inertial force, reduce the vibration during operation, but also increase the air compression flow and improve the work efficiency.

2) Four evenly distributed intake valve holes are used on the intake valve plate, so it can avoid the defect that the valve plate has a large opening when a single valve hole is inhaled, and the valve plate is easy to touch the exhaust valve plate. However, two transverse grooves and two longitudinal grooves are cut on the surface of the intake valve plate, and a gap is formed by punching at the intersection of the transverse groove and the longitudinal groove, so that the deformation factors restricting the longitudinal and transverse directions can be eliminated, thereby ensuring the longitudinal and transverse direction of the intake valve plate. All directions can be uniformly deformed to ensure moderate opening of the valve plate in all directions.

3) The intake port is arranged inside the connecting rod, which can simplify the structure, reduce the volume and reduce the weight.

Description of drawings

Fig. 1 is the assembly explosion schematic diagram of the present invention;

2 is a schematic diagram of the assembly structure of the connecting rod assembly of the present invention combined with a cylinder liner;

Fig. 3 is a schematic diagram of the assembly and explosion of the connecting rod assembly of the present invention;

4 is a schematic structural diagram of an intake reed valve sheet of the present invention;

Fig. 5 is A-A sectional view in Fig. 4;

Fig. 6 is the BB cross-sectional view in Fig. 4;

7 is a schematic structural diagram of another embodiment of the intake reed valve sheet of the present invention;

FIG. 8 is a schematic three-dimensional structure diagram of the pump body of the present invention.

In the figure: cylinder head 1, exhaust valve plate 2, cylinder liner 3, motor 4, pump body 5, connecting rod 6, eccentric wheel 7, fastening screw 8, exhaust valve hole 9, piston body 10, end cover 11 , support bearing 12, counterweight 13, intake reed valve plate 14, intake valve plate 15, exhaust reed valve plate 16, leather cup 17, intake port 18, cavity 19, intake valve hole 20 , transverse groove 21 , gap 22 , longitudinal groove 23 , air inlet 24 , filter 25 , stop 26 , cavity 27 .

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1 to 8: the present invention includes cylinder assemblies respectively fixed on the left and right ends of the pump casing, piston assemblies located in each of the cylinder assemblies, connecting rod assemblies connected with the two piston assemblies, The motor on the pump casing that drives the movement of the connecting rod assembly.

The pump casing is composed of a pump body 5 with an air inlet 24 opened on the front, and an end cover 11 sealed and fixed at the bottom of the pump body. The air inlet 24 communicates with the cavity 27 of the pump body 5 . The cylinder assembly consists of the cylinder liner 3 which is connected with the spigot 26 on the left end face of the pump body 5 and the spigot 26 on the right end face respectively, and the cylinder 3 is sealed at one end of the two cylinder liner 3 through the valve plate assembly and pressed on the pump body 5. The cover 1 is composed of the valve plate assembly consisting of an exhaust valve plate 2 with an exhaust valve hole 9 opened on the surface, and an exhaust reed valve plate 16 fixed on the exhaust valve plate and blocking the exhaust valve hole 9 constitute. The exhaust nozzle (not shown in the figure) fixed on the cylinder head 1 communicates with the cavity 27 through the exhaust valve hole 9 and the cylinder liner 3 in sequence. The piston assembly consists of a piston body 10 in a bowl-like structure located in the cylinder liner 3, a leather cup 17 pressed against the end face of the piston body 10 through an intake valve plate 15 with four intake valve holes 20, and fixed on the intake valve. The intake reed valve plate 14 is formed on the valve plate 15 and blocks the four intake valve holes 20 . The connecting rod assembly is composed of two connecting rods 6 which are located in the cavity 27 and are fixedly connected with each piston body 10 as a whole, and an eccentric wheel 7 which is connected with the two connecting rods 6 through bearings (not shown in the figure) respectively. , the interior of the two connecting rods 6 has an intake port 18 that communicates with the cavity 19 of the piston body 10 . The motor 4 fixed on the top of the pump body 5 is connected with the eccentric wheel 7 in an interference fit manner through its rotating shaft, and is further locked and fixed by a fastening screw 8 .

In order to prevent the rotating shaft of the motor 4 from swinging, a support bearing 12 is fixed on the end cover 11 , and the rotating shaft of the motor 4 is fixed in the support bearing 12 through the two connecting rod holes and the eccentric wheel 7 downward.

During the intake process, under the action of the airflow in the four intake valve holes 20, the intake reed valve plate 14 (thickness 0.076 mm) will be deformed in four directions of up, down, left, and right and open. However, due to the influence of many factors, such as material uniformity, processing error, uneven airflow size of the four intake valve holes 20, and mutual reinforcement when the four corners of the intake reed valve plate 14 are turned outward at the same time, As a result, the deformation amounts of the intake reed valve piece 14 in the four directions of up, down, left, and right are different, resulting in an increase in the opening degree of the intake reed valve piece 14 in a certain direction, and a decrease in the opening degree in a certain direction. This frequent and non-uniform deformation method not only easily causes fatigue of the intake reed valve plate 14 at the deformed place, which affects the service life, but also easily causes the intake reed valve plate 14 to contact the exhaust valve plate 2 when opened at a large angle. touch, resulting in noise and abnormal sound. In order to eliminate the mutual reinforcing effect formed at the corners of the intake reed valve plate 14 when the four directions are turned up at the same time, ensure the uniform deformation of the four directions, make the valve plate open or close freely and reliably, reduce noise, and improve the use of the valve plate Two transverse grooves 21 and two longitudinal grooves 23 are opened on the surface of the intake reed valve plate 14, and a gap 22 is opened at the intersection of the two transverse grooves 21 and the two longitudinal grooves 23. The width of the transverse groove 21 and the longitudinal groove 23 are both 0.5 mm and 0.03 mm in depth.

In order to simplify the processing process, the intake reed valve plate 14 may also adopt a "cross"-shaped structure (see FIG. 8 ).

In order to keep the inside of the cylinder clean, a filter 25 is fixed in the intake port 24 .

In order to reduce vibration, the eccentric wheel 7 is provided with a counterweight 13 which is integrally connected with it.

Working principle: Driven by the motor 4, the connecting rod assembly drives the piston assembly to reciprocate linearly in the cylinder liner 3 (see Figure 1 and Figure 2). When the left piston assembly moves to the right, the left exhaust valve plate 2 closes the left exhaust hole 9; the air enters the cavity 27 from the air inlet 24, and then enters the cavity 19 through the air inlet 18 to Open the intake valve sheet 14 on the left side and enter the cylinder liner 3 to complete the intake. When the piston assembly on the left moves to the left, the intake valve plate 14 on the left closes the intake hole 20; the air in the cylinder liner 3 pushes open the exhaust valve plate 2 on the left due to the pressure, and the cylinder liner 3 pushes open the left exhaust valve plate 2. The air in the cylinder enters the cylinder head 1 through the left exhaust hole 9, and is discharged from the exhaust nozzle to complete the exhaust.

Claims (5)

1. A miniature air compression pump for a portable medical oxygen generator comprises air cylinder assemblies respectively fixed at two ends of a pump shell, piston assemblies positioned in the air cylinder assemblies, connecting rod assemblies connected with the two piston assemblies, and a motor fixed on the pump shell and driving the connecting rod assemblies to move; the method is characterized in that:

the pump shell consists of a pump body (5) with an air inlet (24) on the front surface and an end cover (11) fixed at the bottom of the pump body in a sealing way;

the air cylinder assembly is composed of a cylinder sleeve (3) which is in butt joint communication with the end face of the pump shell and a cylinder cover (1) which seals and compresses one end of the cylinder sleeve through a valve plate assembly, and the valve plate assembly is composed of an exhaust valve plate (2) the surface of which is provided with an exhaust valve hole (9) and an exhaust reed valve plate (16) which is fixed on the exhaust valve plate and blocks the exhaust valve hole (9);

the piston assembly is composed of a piston body (10) which is positioned in the cylinder sleeve (3) and is of a bowl-shaped structure, a leather cup (17) which is tightly pressed on the end surface of the piston body (10) through an air inlet valve plate (15) with four air inlet valve holes (20), and an air inlet reed valve plate (14) which is fixed on the air inlet valve plate (15) and blocks the four air inlet valve holes (20);

the connecting rod assembly consists of two connecting rods (6) which are positioned in a pump shell cavity (27) and are respectively fixedly connected with each piston body (10) into a whole and eccentric wheels (7) which are respectively connected with the two connecting rods (6) through bearings, and air inlet channels (18) which are communicated with cavities (19) of the piston bodies (10) are respectively arranged in the two connecting rods (6);

the motor (4) is fixedly connected with the eccentric wheel (7).

2. The miniature air compressor pump for a portable medical oxygen generator as set forth in claim 1, wherein: two transverse grooves (21) and two longitudinal grooves (23) are formed in the surface of the air inlet reed valve plate (14), and notches (22) are formed in the intersection of the two transverse grooves (21) and the two longitudinal grooves (23).

3. The miniature air compressor pump for a portable medical oxygen generator as set forth in claim 1, wherein: the air inlet reed valve plate (14) is in a cross-shaped structure.

4. The miniature air compressor pump for a portable medical oxygen generator as set forth in claim 1, wherein: a filter (25) is fixed in the air inlet (24).

5. The miniature air compressor pump for a portable medical oxygen generator as set forth in claim 1, wherein: the eccentric wheel (7) is provided with a counterweight block (13) which is connected with the eccentric wheel into a whole.

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