KR101576472B1 - ELECTRO VACUUM PUMP with Nozzle in the Fluid Passage - Google Patents

Abstract

The present invention relates to an electric vacuum pump, and more particularly, to an electric vacuum pump including a motor module including an electric motor and providing a driving force by an external power source; A housing provided at one side to be able to engage with the motor module; A pump module having a pump inlet through which air is sucked and a pump outlet through which the sucked air is discharged, the pump module being coupled to the other side of the housing; A discharge line that is a flow path for discharging the air pressurized by the pump module; The suction line or the discharge line may include a nozzle for changing an area of a flow path through which air flows.
Accordingly, it is possible to provide an electric vacuum pump which is simple in structure and easy to use, and can reduce noise and pulsation.

Description

ELECTRO VACUUM PUMP WITH NOZZLE IN THE FLUID PASSAGE

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum pump, and more particularly, to an electric vacuum pump in which the structure is improved to have an orifice in a suction or discharge line.

Automobiles are a modern means of transportation that combines many components. Such a vehicle typically uses a braking device for the driver to stop the vehicle. The braking device is composed of an operating mechanism that increases the operating force of the driver by using a link or hydraulic pressure and a main body that generates the braking force by receiving the force. Among them, the power brake uses vacuum or compressed air to lighten the operating force.

The vacuum pump used in the braking device for assisting the braking force is distinguished by being driven by an engine or the like and by a motor. In recent years, electric vacuum pumps driven by electric motors have been increasing in consideration of economical efficiency as they are applied to small automobiles.

Japanese Patent Application Laid-Open Nos. 10-2011-0001417 (Jan. 13, 2011) and 10-2011-0004216 (Jan. 13, 2011) disclose electric vacuum pumps related to the related art.

However, it is desirable to reduce the pulsation generated in the electric vacuum pump and reduce the noise.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric vacuum pump capable of reducing noise while having a simple and convenient structure without being complicated.

Another object of the present invention is to provide an electric vacuum pump capable of reducing pulsation.

An object of the present invention is to provide a motor-driven vacuum pump including: a motor module including an electric motor, the motor module providing a driving force by an external power source; A housing provided at one side to be able to engage with the motor module; A pump module having a pump inlet through which air is sucked and a pump outlet through which the sucked air is discharged, the pump module being coupled to the other side of the housing; A discharge line that is a flow path for discharging the air pressurized by the pump module; Wherein the suction line or the discharge line includes a nozzle for changing an area of a flow path through which air flows.

The nozzle may further include a nozzle body coupled to one of the suction line and the discharge line; And a flow path changing portion having a large diameter portion formed through the nozzle body and a small diameter portion having a smaller flow path area than the large diameter portion and communicating with the large diameter portion.

The nozzle may further include a nozzle body coupled to one of the suction line and the discharge line; And a plurality of nozzle through holes formed through the nozzle body.

The nozzle body may include a nozzle body coupled to one of the suction line and the discharge line, a large diameter portion formed through the nozzle body, and a small diameter portion having a smaller flow path area than the large diameter portion and penetrating the large diameter portion so as to communicate with the large diameter portion A first nozzle including a flow path changing portion; A nozzle body coupled to the other of the suction line and the discharge line, and a second nozzle including a plurality of nozzle through holes formed through the nozzle body.

According to the present invention, it is possible to prevent moisture from flowing into the pump module or the motor module, prevent troubles and damages that may be caused by moisture infiltration, change the flow path area of the discharge line, It is possible to provide an electric vacuum pump capable of reducing pulsation and noise.

FIG. 1 is a perspective view of an electric vacuum pump according to an embodiment of the present invention,
2 is a sectional view of the electric vacuum pump,
3 is a cross-sectional view of the pump module,
4A to 4C are a partial cross-sectional view and a component cross-sectional view for explaining a nozzle according to one embodiment and another embodiment,
5 is a view showing still another embodiment,
Fig. 6 is a view showing still another embodiment. Fig.

A motor-driven vacuum pump 100 having a nozzle in a flow path according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5. FIG.

2 is a cross-sectional view of an electric vacuum pump, FIG. 3 is a cross-sectional view of a pump module, FIGS. 4A to 4C are cross-sectional views of a pump according to an embodiment and another embodiment FIG. 5 is a view showing still another embodiment, and FIG. 6 is a view showing still another embodiment.

The electric vacuum pump 100 is coupled to the interior of the vehicle to provide vacuum pressure to the booster or the like to improve the braking ability of the vehicle. The electric vacuum pump 100 includes a motor module 150 generating a driving force by an external power source, a pump module 130 coupled to the motor module 150 to suck and discharge air by rotation, A suction line 171 which is a flow path for guiding the motor module 150 and the pump module 130 to be introduced into the pump module 130 and a housing 110 for housing and supporting the pump module 130, A discharge line 173 which is a flow path for discharging air; In the suction line 171 or the discharge line 173, a nozzle 180 for reducing the area of the passage through which air flows is provided.

The housing 110 includes a housing main body 111 including an aluminum material and supporting the pump module 130 and the motor module 150 and a pump cover 130 coupled to the housing main body 111 and covering the pump module 130 side And a motor cover 115 coupled to the housing main body 111 and covering the motor module 150 side.

A suction line 171 through which air is sucked may be coupled to the housing main body 111 and a discharge line 173 through which the pressurized air may be discharged from the pump module 130 may be formed if necessary. In some cases, the discharge line 173 may be formed on the pump cover 113 side.

The pump module 130 introduces the air using the rotational force provided by the motor module 150, presses the air, and discharges the air. The pump module 130 includes a plurality of slots 131b which are coupled by the coupling means 117 including a coupling coupled to the rotational axis 151c of the motor module 150, (Not shown) which is a space in which air is sucked and compressed between the vanes 131a by forming a guide surface on which the vane 131a slides inward eccentrically with the rotor 131, A suction hole 137a and a discharge hole 137b which are connected to both sides of the cam ring 133 and the rotor 131 so as to form a chamber and through which air is sucked and discharged, And 137b.

The motor module 150 includes a motor 151 including a stator 151a that applies a rotational force by an external power source, a rotor 151b that rotates, and a rotational shaft 151c that is coupled to the rotor 151b. And a motor drive control board 153 including a circuit board for controlling the motor 151 to be driven by an applied power source and transmitting and receiving signals to and from the main control unit ECU of the vehicle. Here, the motor driving control board 153 is coupled to the motor cover 115 coupled to the housing main body 111 so as to maintain airtightness, and can be separated from moisture or the like introduced from the outside.

Water or the like may be introduced into the motor module 150 from the pump module 130 through the rotating shaft through hole 117a formed in the housing main body 111 so that the rotating shaft 151c penetrates. According to the present invention, when the housing main body 111 and the motor module 150 are interposed between the motor module 150 and the housing main body 111, the housing main body 111 is elastically deformed by pressing, And a hermetic holding member (not shown) made of a material including rubber that can block moisture flowing between the motor module 150 and the motor module 150.

The pump module 113 includes a pump module fastening bolt 193 for coupling the pump module 130 to the housing main body 111 and a pump module fastening bolt 193 for fastening the pump cover 113 to the housing main body 111. [ A motor module fastening bolt 195 for coupling the motor module 150 to the housing main body 111 and a motor coupling bolt 195 for coupling the motor cover 115 to the housing main body 111. [ And a cover fastening bolt 197 are respectively provided.

The nozzle 180 may be coupled to the suction line 171 as shown in Figure 4a and may be coupled to the discharge line 173 as shown in Figure 5 and the suction line 171 and the discharge line 173, respectively.

In one embodiment of the present invention, the nozzle 180 includes a nozzle body 181 that reduces the area of the air flow path and is coupled to one of the suction line 171 and the discharge line 173, as shown in Figure 4B, The flow path changing portions 183a and 183b including the large diameter portion 183a formed in the nozzle body 181 and the small diameter portion 183b provided so as to communicate with the large diameter portion 183a with a smaller flow path area than the large diameter portion, Respectively.

The nozzle 180 according to another embodiment of the present invention includes a nozzle body 181 coupled to one of the suction line 171 and the discharge line 173 and a nozzle body 181 coupled to one of the suction line 171 and the discharge line 173, And a plurality of nozzle through-holes 183 formed through the through-holes. Although the sum of the cross-sectional areas of the plurality of nozzle through holes 183 is preferably smaller than the cross-sectional area of the flow path, it may be as large as necessary, but in this case, the flow path becomes larger than necessary.

5A, the nozzles 180b of FIG. 5B and the nozzles 180A of FIG. 5C may be sequentially coupled to the suction line 171 at a distance from each other.

In Table 2 to be described later, the first embodiment shows the case of FIG. 4C, the second embodiment shows the case of FIG. 4B, and the third embodiment shows the case of FIG. 5A.

Here, the nozzle 180 does not exclude the enlargement of the area of the air flow path.

In this nozzle 180, when the air flow and the pulsation generated in the pump module 130 pass before and after the large diameter portion 183a, the small diameter portion 183b, and the nozzle through hole 183, When the air passes through a certain space, it distributes the velocity and changes the tone through the set.

In other words, a sound is also called a sound wave, a wave phenomenon transmitted at a speed of 340m per second, and we are listening to the waves transmitted in the air. This wave is a fluctuation of the density change of the air, and this pressure fluctuation (sound pressure) occurs continuously. The frequency range of sound (audible sound) that human beings can perceive is approximately 20 Hz to 20 kHz, and the range of sound pressure is 20 μPa to 20 Pa. Table 3 shows the three attributes of these sounds.

The present invention can provide a variation of tone color through dispersion and aggregation of velocity when sound and air pass through a specific space. It is considered that the noise improvement effect is added when the external air velocity change and pressure change are simultaneously given. Changes in tone and pressure that can be heard through a change in flow rate and pressure through a nozzle containing an orifice can vary.

The operation and effects of the electric vacuum pump 100 according to the present invention having such a configuration will be described below.

When the user presses the brake, the vehicle central control unit (not shown, ECU) sends a signal to the motor drive control board 153 based on a signal of a sensor (not shown) (151), the rotating shaft (151c) rotates.

The rotor 131 is rotated by the rotation of the rotary shaft 151c so that the air flows into the electric vacuum pump 100 along the suction line 171 and the introduced air is compressed and discharged to the discharge line 173.

In this process, the air flowing along the flow path is passed at a faster speed than the other flow path at a portion where the area of the nozzle 180 is narrowed. Such a speed change can alleviate the pulsation and the pulsation relaxation reduces the noise. .

The results of the test according to the present invention are summarized in Table 2 below.

Test conditions are as follows: Temperature 23 ° C ± 2 ° C, Vacuum tank capacity 3,200cc, Voltage 12V ± 0.2 ° C, Noise level 40dB, Vacuum degree 370mmHg @ 5sec Respectively.

division Suction line Inner diameter
( mm ) Nozzle( Orifice ) Specifications
( mm ) noise
( dB ) Vacuum degree
Reach time Remarks Comparative Example φ6.5 radish 73.5 4.5 Example 1 φ6.5 φ1.2 X 5Hole 71.5 4.8 Example 2 φ6.5 φ3 X 1Hole 71.2 4.8 Example 3 φ6.5 Shear: φ1 ~ 1.5 X 5EA
Back end: φ3 X 1Hole 69.5 5.2

As can be seen from the above table, according to the present invention, the degree of vacuum is somewhat disadvantageous as compared with the case of no nozzle, which is the comparative example, but it is confirmed that the noise is reduced as compared with the comparative example.

Therefore, according to the present invention, noise can be reduced through a simple and convenient nozzle.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the invention. will be. The scope of the invention will be determined by the appended claims and their equivalents.

100: electric vacuum pump 110: housing
111: housing body 113: pump cover
115: motor cover 117a: rotation shaft through hole
130: pump module 131: rotor
131a: Vane 131b: Slot
133: Cam ring 135: Side plate
137a: suction hole 137b: discharge hole
150: motor module 151: motor
151a: stator 151b: rotor
151c: rotating shaft 153: motor driving control board
171: Suction line
173: exhaust line 175: sealing member
180: nozzle 181: nozzle body
183: Nozzle through hole 183a: Large diameter portion
183b:
191: Pump cover tightening bolt 193: Pump module tightening bolt
195: Motor module fastening bolt 197: Motor cover fastening bolt

Claims (4)

In the electric vacuum pump,
A motor module including an electric motor for providing a driving force by an external power source;
A housing provided at one side to be able to engage with the motor module;
A pump module having a pump inlet through which air is sucked and a pump outlet through which the sucked air is discharged, the pump module being coupled to the other side of the housing;
A discharge line that is a flow path for discharging the air pressurized by the pump module;
Wherein the suction line or the discharge line includes a nozzle for changing an area of a flow path through which air flows,
A nozzle body coupled to one of a front end and a rear end of the suction line, a large diameter portion passing through the nozzle body, and a small diameter portion having a smaller flow path area than the large diameter portion and communicating with the large diameter portion, A first nozzle including a nozzle;
And a second nozzle including a nozzle body coupled to another one of a front end and a rear end of the suction line, and a plurality of nozzle through holes formed through the nozzle body. delete delete delete

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