JPH027266Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vacuum pump device such as a diaphragm piston type or a sliding piston type.

[Prior art]

As a type of vacuum pump device, an operating piston is assembled inside the pump housing so that it can reciprocate, and the rod part of the operating piston is connected to the pump drive shaft, and suction is drawn into one side of the piston part of the operating piston. a pump chamber communicating with the actuator side through a discharge check valve, and an exhaust chamber communicating with the pump chamber through a discharge check valve on the other side of the piston portion and communicating with the atmosphere through an air filter; There is a type of vacuum pump device in which the actuating piston is reciprocated by rotation of a pump drive shaft, and the negative pressure generated in the pump chamber is applied as a negative pressure source to the actuator.

In this type of vacuum pump device, negative pressure is generated in the pump chamber by discharging gas within the pump chamber into the exhaust chamber and into the atmosphere through an air filter when the operating piston reciprocates. Additionally, when the actuating piston reciprocates, the gas in the exhaust chamber is intermittently discharged to the atmosphere through the air filter, and the pressure in the exhaust chamber may momentarily become negative, so the atmosphere may flow into the exhaust chamber through the air filter. There is.

[Problem that the invention attempts to solve]

As described above, in this type of vacuum pump device, the air flows into the exhaust chamber through the air filter, and therefore, while the device is in operation, dust in the atmosphere may adhere to the air filter and cause clogging. When the air filter becomes clogged, ventilation resistance increases and the exhaust performance from the exhaust chamber to the atmosphere decreases. Therefore, the function of discharging gas from the pump chamber to the exhaust chamber may be affected, and the set ultimate degree of vacuum and the speed at which the predetermined negative pressure is reached may also be reduced.

[Means for solving problems]

In order to solve this problem, the present invention provides the vacuum pump device of the type described above with an exhaust fan driven by the rotation of the pump drive shaft in the exhaust chamber, and an exhaust flow caused by the exhaust fan in the pump housing. The air filter is characterized in that an opening is provided in opposing portions, and the air filter is disposed in the opening.

[Functions and effects of the idea]

As a result, in the vacuum pump device, when the operating piston is reciprocated by the rotation of the pump drive shaft to generate negative pressure in the pump chamber, the exhaust fan is simultaneously driven to direct the exhaust flow toward the air filter and the opening. to occur. Therefore, the exhaust flow generated by the exhaust fan is added to the exhaust action of the working piston during the exhaust stroke in the exhaust chamber, and a strong exhaust flow is discharged to the atmosphere from the opening through the air filter. Therefore, the dust once attached to the air filter is separated from the air filter by the strong exhaust flow and released into the atmosphere. Therefore, in the vacuum pump device, the air filter will not become clogged and the exhaust performance will not deteriorate, and there is no risk of reducing the set ultimate vacuum degree and the speed at which the vacuum reaches the predetermined negative pressure.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 1 shows a diaphragm piston type vacuum pump device which is an embodiment of the vacuum pump device according to the present invention. This pump device includes a diaphragm piston 20 within a pump housing 10 and is driven by an electric motor 30.

The pump housing 10 includes a housing body 11,
It consists of a head cover 12 and a head plate 13, and the head cover 12, with the head plate 13 fitted, is hermetically assembled to the upper end opening of the housing body 11 via a diaphragm 23, which will be described later. A casing 31 of a motor 30 is airtightly assembled into an opening 11 a provided in the lower part of one side of the housing body 11 , and an output shaft 32 of the motor 30 projects into the housing body 11 . Further, an exhaust port 11b is provided at the lower portion of the other side of the housing body 11, and the exhaust port 11b is covered by a cover 14 assembled to the outer periphery of the housing body 11. The cover 14 is provided with a large number of exhaust holes 14a, and houses an air filter 15a in an inner recess 14b.The filter 15a is prevented from falling out of the recess 14b by a retainer 15b fitted to the exhaust port 11b. Prevented.

The diaphragm piston 20 includes a piston portion 21 consisting of a pair of upper and lower disks 21a and 21b, a rod portion 22 integral with the lower disk 21b, and a rubber diaphragm 23 held between both the disks 21a and 21b. diaphragm 23
The outer peripheral edge of the head cover 12 is sandwiched and assembled between the housing body 11 and the head cover 12. The lower end of the rod portion 22 is rotatably mounted on a crank 33 mounted on an output shaft 32 of a motor 30, so that the piston 20 is driven by the motor 30 to repeatedly move back and forth in the vertical direction.

The piston 20 divides the inside of the pump housing 10 into upper and lower parts by its diaphragm 23.
A pump chamber R1 is formed between the head plate 13 and an exhaust chamber R2 within the housing body 11. The pump chamber R1 has a head plate 13.
It communicates intermittently with the intake passage 12a via an intake check valve 16 provided in the center of the upper disk 21a, and intermittently communicates with the exhaust chamber R2 via a discharge check valve 24 provided in the center of the upper disk 21a. are doing.

In this pump device, as shown in FIGS. 1 and 2, an exhaust fan 34 is mounted on the crank 33. exhaust fan 34
is formed by fixing a plurality of fins 34b to the tip of a collar 34a, and the ball bearing 3 is fitted onto the shaft portion 33a of the crank 33.
5a and a nut 35b. Each fin 34b of the exhaust fan 34 is curved at a predetermined angle in the direction of rotation of the fan, and has a function of causing air flowing in from the outer circumferential side to flow out from the center portion forward. The exhaust fan 34 is connected to the housing body 11.
The exhaust port 11b is located close to and substantially opposed to the exhaust port 11b, and when driven, the exhaust flow is directed in the direction of the arrow in FIG.

In the pump device configured in this manner, when the output shaft 32 is rotated by driving the motor 30, the piston 20 repeatedly reciprocates in the vertical direction. During this reciprocating movement, while the inside of the pump chamber R1 undergoes each stroke of compression, exhaust, expansion, and suction, air is discharged to the exhaust chamber R2 through the discharge check valve 24, and negative pressure is applied to the intake passage through the suction check valve 16. 12a side. The exhaust gas discharged into the exhaust chamber R2 is discharged to the atmosphere through the air filter 15a by the exhaust action of the piston 20.

Incidentally, in the pump device, the exhaust fan 34 is driven by the drive of the motor 30 to generate an exhaust flow, which is directed toward the air filter 15a. Therefore, when the piston 20 moves downward to perform an exhaust action, an exhaust flow is added by the exhaust fan 34, and a strong exhaust flow is discharged to the atmosphere through the air filter 15a, removing dust that has once adhered to the air filter 15a from the air filter 15a. and release it into the atmosphere. Therefore, the air filter 15a will not be clogged due to the accumulation of dust, and there will be no deterioration in exhaust performance and there is no risk of reducing the set ultimate degree of vacuum and the speed at which the predetermined negative pressure is reached.

In addition, in this pump device, the exhaust performance in the exhaust chamber R2 is improved by the exhaust fan 34, so the opening resistance of the discharge check valve 24 is reduced, and the speed at which the predetermined negative pressure in the pump chamber R1 is reached is increased. improves.

FIG. 3 shows a modification of the pump device in the above embodiment. In this variant,
An exhaust fan 34A shown in FIG. 4 is integrally provided on the outer periphery of the connection portion of the crank 33 with the output shaft 32. This exhaust fan 34A allows the exhaust flow to flow out toward its outer circumference, and is located close to the exhaust port 11c provided at the bottom of the housing body 11, directing the exhaust flow to the exhaust port 11c as shown by the arrow.
Direct it to 1c. The exhaust port 11c is covered with a cover 14A housing an air filter 15c, and the exhaust inside the exhaust chamber R2 is passed through the air filter 1.
5c to the atmosphere. Therefore, this modification also provides substantially the same effect as the above embodiment due to the exhaust action of the exhaust fan 34A.

In this embodiment, an example was shown in which the present invention was implemented in a diaphragm piston type vacuum pump device, but the present invention also provides an airtight and axial connection of the piston part of the operating piston to the cylinder part provided inside the pump housing. It can also be implemented in a sliding piston-type vacuum pump device in which the pump is fitted so as to be slidable in the direction.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a vacuum pump device according to an embodiment of the present invention, FIG. 2 is a front view of an exhaust fan in the same device, and FIG. 3 is a partial vertical sectional view showing a modification of the same device. FIG. 4 is a rear view of the exhaust fan in the same device. Explanation of symbols, 10... Pump housing, 11
b, 11c...exhaust port, 15a, 15c...air filter, 16...intake check valve, 20
... diaphragm piston, 21 ... piston part, 22 ... rod part, 23 ... diaphragm,
24...Discharge check valve, 30...Motor, 32...Output shaft, 33...Crank, 34,
34A...Exhaust fan, R1...Pump chamber, R2
...Exhaust chamber.

Claims (1)

[Scope of utility model registration request] The actuating piston is reciprocatably assembled inside the pump housing, and the rod part of the actuating piston is connected to the pump drive shaft, and a suction check valve is passed through one side of the piston part of the actuating piston to communicate with the actuator side. A pump chamber is formed, and an exhaust chamber is formed on the other side of the piston portion, which communicates with the pump chamber through a discharge check valve and communicates with the atmosphere through an air filter, and when the pump drive shaft rotates, the working piston In the vacuum pump device, an exhaust fan driven by rotation of the pump drive shaft is provided in the exhaust chamber, and an exhaust fan driven by rotation of the pump drive shaft is provided in the exhaust chamber; A vacuum pump device characterized in that an opening is provided at a portion of the housing that faces the exhaust flow from the exhaust fan, and the air filter is disposed in the opening.