CN204472781U - A kind of electric vacuum pump - Google Patents

Abstract

The utility model provides an electric vacuum pump, which comprises a drive motor assembly, a pump body assembly and a sound-absorbing structure assembly. The pump body assembly and the motor shaft of the drive motor assembly form a radial eccentric installation mode. The drive motor assembly It consists of a driving motor and a pump body bracket. The pump body assembly includes an upper cover plate, a lower cover plate, a rotor chamber, a rotor and blades. The sound-absorbing structure assembly includes a shell and a rubber ring; There are air passages and air suction pipes and exhaust pipes respectively communicating with the air passages, and the upper cover plate and the lower cover plate of the pump body assembly are respectively provided with exhaust ports or air suction ports. The shell of the sound-absorbing structure assembly is provided with a cylindrical convex cavity with a ventilation groove. The utility model is small in size, high in pumping efficiency, low in noise and light in weight, and can effectively solve the problem of insufficient vacuum of the automobile brake booster; due to the use of two-stage noise-absorbing buffer chambers, the gas is slowly released to the outside, greatly reducing the work noise at the time.

Description

An electric vacuum pump

technical field

The utility model relates to an electric vacuum pump, which belongs to the field of automobile braking.

Background technique

Whether it is a gasoline engine or a diesel engine, it is not the only source of vehicle power. The direction of vehicle development is towards multi-fuel and hybrid vehicles. However, fuel engines, electric vehicles, etc. all lack engines, thus lacking a vacuum source. Automobile brake vacuum booster works by vacuum negative pressure. A car brake booster cannot function properly without a source of vacuum. Therefore, an independent vacuum source must be used to solve the problem of vacuum boosting, so as to ensure its braking performance.

At present, the vacuum source of the brake system of the car is mostly provided by the engine intake manifold or directly from the on-board vacuum pump. However, the brake vacuum booster of the automobile often has insufficient vacuum degree, and the electric vacuum pump with the existing structure has low pumping efficiency, obvious noise, and short service life of the vacuum pump blades. Therefore, a compensating device is needed to make up for the lack of vacuum produced by the engine or to directly generate a sufficient source of vacuum from the device.

Contents of the invention

The main purpose of the utility model is to provide an electric vacuum pump, which is small in size, high in pumping efficiency, low in noise and light in weight, and can effectively solve the problem of insufficient vacuum of the automobile brake booster.

In order to achieve the above object, the utility model adopts the following technical scheme: an electric vacuum pump, including a drive motor assembly, a pump body assembly and a sound-absorbing structure assembly, the pump body assembly and the motor shaft of the drive motor assembly form a radial eccentric Installation method, the drive motor assembly includes a DC drive motor and a pump body bracket, the pump body assembly includes an upper cover plate, a lower cover plate, a rotor chamber, a rotor and blades, and the sound-absorbing structure assembly includes a shell, rubber circle; the pump body bracket is provided with an air channel and an air exhaust pipe and an exhaust pipe respectively connected with the air channel, and the upper cover plate and the lower cover plate of the pump body assembly are respectively provided with an air exhaust port or an air exhaust port, Ventilation grooves and rubber rings are arranged inside the shell of the sound-absorbing structural assembly.

As a further preference, the shell of the sound-absorbing structure assembly is provided with a cylindrical convex cavity with the ventilation groove, and the rubber ring is installed on the outer wall of the cylindrical convex cavity, and the installation method with the outer wall of the cylindrical convex cavity is interference fit.

As a further preference, the rubber ring, the upper cover plate, the casing and the cylindrical convex cavity form a primary noise-absorbing buffer chamber, and the casing and the pump body support form a secondary noise-absorbing buffer chamber. The ventilation groove on the cylindrical protrusion in the shell is the air channel between the first-level muffler cavity and the second-level muffler cavity, and the rubber ring plays the role of sealing and buffering gas.

As a further preference, there are two air passages, one communicates with the suction pipe, and the other communicates with the exhaust pipe.

As a further preference, an O-ring groove and a shock absorber are provided on the pump body bracket of the drive motor assembly.

As a further preference, the O-ring groove is located on the outer edge of the air channel connected with the suction pipe and the outer edge of the pump body assembly, and there are two shock absorbers arranged on the outer circumference of the pump body assembly outside.

As a further preference, the rotor in the pump body assembly is provided with vane slots evenly distributed around the circumference, and the vane slots are semicircular in shape.

As a further preference, the number of the vane grooves is 4 or more.

As a further preference, the vane shape of the pump body assembly is cylindrical.

As a further preference, the inner cavity of the rotor is a circular or oval cavity.

As a further preference, a stopper is installed on the drive motor shaft, the stopper is an interference fit with the drive motor shaft, the rotor is provided with a stopper groove, and the rotor is synchronized with the drive motor shaft through the stopper function Rotational movement.

The beneficial effect of the utility model is: when in use, the drive motor of the electric vacuum pump of the utility model is connected with the car battery, and when the pressure sensor of the car vacuum booster detects that the negative pressure in the vacuum tank is insufficient, it sends a pulse signal to the control unit of the electric vacuum pump, The electric vacuum pump starts to run after receiving this signal, and pumps out the gas in the vacuum tank to generate a vacuum negative pressure in the vacuum tank. Therefore, the brake booster can work normally. This electric vacuum pump has the characteristics of small size, high pumping efficiency, low noise, and light weight.

The utility model can not only effectively solve the problem of insufficient vacuum of the automobile brake booster, but also because the two-stage sound-absorbing buffer chamber is adopted, the gas is slowly released to the outside, and the noise during operation is greatly reduced. In particular, the utility model adopts a cylindrical blade structure, and the contact between the blade and the inner wall of the rotor is line contact and the friction mode is rolling friction, which greatly reduces the wear of the blade. Compared with other dry structure vacuum pumps, the service life of the utility model has been greatly improved.

Description of drawings

Fig. 1 is an exploded view of an electric vacuum pump according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of the pump body assembly of the electric vacuum pump according to the embodiment of the present invention.

Fig. 3 is a cross-sectional view of the drive motor assembly of the electric vacuum pump according to the embodiment of the present invention.

Fig. 4 is an exploded view of the sound-absorbing structure assembly of the embodiment of the present invention.

The markings in the drawings are explained as follows: 1-drive motor, 2-pump body bracket, 3-stop sleeve, 4-suction port, 5-rotor chamber, 6-blade, 7-rotor, 8-upper cover plate, 9- Shell, 10-Rubber ring, 11-Exhaust port, 12-Sleeve groove, 13-Rotor chamber cavity, 14-Lower cover plate, 15-Exhaust pipe, 16-Sealed chamber, 17-Blade groove, 18- Exhaust pipe, 19-air channel, 20-motor shaft, 21-air channel, 22-O-ring groove, 23-shock absorber, 24-ventilation groove, 25-cylindrical raised cavity.

Detailed ways

The realization of the purpose of the utility model, functional characteristics and beneficial effects will be further described below in conjunction with specific embodiments and accompanying drawings.

Below in conjunction with drawings and specific examples, the technical solution of the utility model will be described in further detail, so that those skilled in the art can better understand the utility model and implement it. A new type of limitation.

As shown in Figures 1-4, the electric vacuum pump for the automobile brake booster system according to the embodiment of the present invention includes a drive motor 1, a pump body bracket 2, a stopper 3, a lower cover plate 14, a rotor chamber 5, blades 6, a rotor 7, Upper cover plate 8, shell 9, rubber ring 10. The pump body support 2 has air passages 19 and 21 and communicates with the exhaust pipe 15 and the suction pipe 18 respectively. The pump body support 2 has an O-ring groove 22 and a shock absorber 23 installed thereon. The lower cover plate 14 is provided with an air extraction port 4, the rotor 7 is provided with semicircular vane grooves 17 evenly distributed around the circumference and the sleeve groove 12, the upper cover plate 8 is provided with an exhaust port 11, and the inside of the casing 9 is provided with a ventilation groove 24 . The stop sleeve 3 is in interference fit with the motor shaft 20 , and the rotor 7 rotates synchronously with the motor shaft 20 through the stop sleeve 3 .

The working principle of the embodiment of the utility model is as follows: the drive motor shaft 20 rotates to drive the rotor 7 to rotate, and due to the centrifugal force, the blade 6 installed in the semicircular blade groove 17 of the rotor 7 is thrown out to contact with the inner wall of the rotor chamber 5, A closed chamber(s) 16 is formed. The volume of the airtight chamber 16 is continuously and alternately changed, thereby forming a pumping and exhausting process. Then the gas enters the airtight chamber 16 through the air suction pipe 18 on the pump body bracket 2 and enters the air suction port 4 on the lower cover plate 14 through the air channel 21 . Then the gas enters through the exhaust port 11 on the upper cover plate 8 into the primary buffer chamber formed by the rubber ring 10 , the upper cover plate 8 and the cylindrical raised cavity 25 in the shell 9 . At this time, the compressed gas gets the first slow pressure. Then the slow pressure gas enters into the secondary sound-absorbing buffer chamber formed by the casing 9 and the pump body support 2 through the vent groove 24 on the casing 9 . The impact of the gas after slow pressure is weakened by the secondary sound-absorbing buffer chamber, and finally discharged to the outside through the air channel 19 on the pump body support 2 through the exhaust pipe 15 .

The embodiment of the utility model can not only effectively solve the problem of insufficient vacuum degree of the automobile brake booster, but also because the two-stage sound-absorbing buffer chamber is used, the gas is slowly released to the outside, which greatly reduces the noise during operation.

Claims (10)

1. An electric vacuum pump, comprising a drive motor assembly, a pump body assembly and a sound-absorbing structure assembly, the pump body assembly and the motor shaft of the drive motor assembly form a radial eccentric installation, and the drive motor assembly includes a drive The motor and the pump body support, the pump body assembly includes an upper cover plate, a lower cover plate, a rotor chamber, a rotor and blades, and the sound-absorbing structure assembly includes a shell; it is characterized in that: the pump body support is provided with air channel and the exhaust pipe and exhaust pipe respectively communicated with the air passage, the upper cover plate and the lower cover plate of the pump body assembly are respectively provided with an exhaust port or an air intake port, and the shell of the sound-absorbing structure assembly is provided with Vent grooves and rubber rings. 2. The electric vacuum pump according to claim 1, characterized in that: the shell of the sound-absorbing structure assembly is provided with a cylindrical convex cavity with the ventilation groove, and the rubber ring is installed on the outer wall of the cylindrical convex cavity . 3. The electric vacuum pump according to claim 1, characterized in that: the rubber ring, the upper cover plate, the casing and the cylindrical convex cavity form a primary buffer cavity, and the casing and the pump body support form a secondary buffer cavity cavity. 4. The electric vacuum pump according to claim 1, characterized in that: there are two air passages, one communicates with the suction pipe, and the other communicates with the exhaust pipe. 5. The electric vacuum pump according to claim 1, characterized in that: O-ring grooves and shock absorbers are provided on the pump body bracket of the driving motor assembly. 6. The electric vacuum pump according to claim 5, characterized in that: the O-ring groove is located on the outer edge of the air channel connected with the exhaust pipe and the outer edge of the pump body assembly, and the shock absorber has two One, set outside the outer circumference of the pump body assembly. 7. The electric vacuum pump according to claim 1, characterized in that: the rotor in the pump body assembly is provided with vane grooves evenly distributed around the circumference, the shape of the vane grooves is semicircular, and the pump body The blade shape of the assembly is cylindrical. 8. The electric vacuum pump according to claim 7, characterized in that: the number of the vane grooves is 4 or more. 9. The electric vacuum pump according to claim 1 or 7, characterized in that: the inner cavity of the rotor chamber is a circular or oval cavity. 10. The electric vacuum pump according to claim 1, characterized in that: a stop sleeve is installed on the motor shaft of the drive motor assembly, the stop sleeve and the drive motor shaft are interference fit, and the rotor is open and closed. The sleeve groove, the rotor ensures synchronous rotation with the drive motor shaft through the action of the stop sleeve.