JPH0214556B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a valve structure for a pump such as a reciprocating compressor or a vacuum pump.

[Background of the invention]

FIG. 1 is a sectional view of a main part of a valve section of a conventional reciprocating compressor (Japanese Utility Model Application No. 56-127890). In the figure,
A push rod 3 is attached to the end plate 1 of the vacuum pump with a bush 2 interposed therebetween.
A diaphragm 6 and a support plate 7 are fixed.
The peripheral edge of the diaphragm 6 is clamped between the pump end plate 1 and the cover 23 and fixed airtightly. 12
is rotatably attached via a support shaft 9 to a bracket 8 set on the pump end plate 1 with a swing lever,
It is rotatably driven by the eccentric cam 11 of the camshaft 10 to press the other end side of the push rod 3 and press and displace the push rod 3 in the axial direction. 13 is an intake pipe, 14 and 15 are umbrella valves, 16 is an exhaust chamber, 17 is an outlet umbrella valve, 18 is an outlet, and 19 is a spring that is always biased to push down the piston 5.

Then, as the push rod 3 is displaced in the direction of the arrow 20 due to the rotation of the camshaft 10, the pressure inside the suction and compression chamber 4 becomes low, and the intake pipe 13
Air is drawn in as shown by arrow 22, the umbrella valve 14 is opened, and the air is sucked into the compression chamber 4. At this time, the umbrella valve 15 is in communication with the chamber 24 and is closed.
Next, when the push rod 3 is displaced in the direction opposite to the arrow 20 by the spring 19 in conjunction with the rotation of the eccentric cam 11, the gas in the suction/compression chamber 4 is compressed, and the umbrella valve 14 closes and the umbrella valve 15 opens. and is discharged into the chamber 24. The outlet umbrella valve 17 is opened, the air in the chamber 24 is discharged through the exhaust chamber 16 and the outlet 18 as shown by the arrow 21, and the above operation is repeated.

In the above structure, the installation of the umbrella valve 14 is
If this is done after the intake pipe 13 has been attached to the pump end plate 1, the attachment work will be difficult. Furthermore, if the intake pipe 13 is attached after the umbrella valve 14 is attached, it becomes difficult to attach the intake pipe 13 to the attachment part in a sealed manner, and the structure is complicated.

In addition, in conventional products similar to the valve of the present invention that are not umbrella-shaped valves, the intake valve and the discharge valve are each made of a rigid material, and therefore the rubber sealing material,
Many parts were required, including a valve guide, valve material, a spring to elastically fix the valve plate, and cushion material for the valve plate.

[Purpose of the invention]

The present invention has been made in view of the above situation, and an object of the present invention is to provide a pump valve structure that has a small number of parts, is easy to install, and can significantly reduce the number of assembly steps.

[Summary of the invention]

The valve structure of the pump of the present invention includes a suction compression chamber formed by mounting a diaphragm in a recess on one side of the head plate, and a head cover attached to the recess on the other side of the head plate. a suction passage and a discharge valve passage communicating with the air passage; an annular suction passage provided in the head plate and communicating with the suction port with the suction passage as the center; and an annular discharge opening on the air passage side of the discharge valve passage. inserted into the air passageway that is provided with a discharge passageway that opens at the center of the passageway and communicates with the discharge port;
An annular thick wall portion formed of an elastic material and serving as a barrier and seal between the suction side and the discharge side, and a portion extending from the thick wall portion to the fluid passage opened in the center portion is thinner than the thick wall portion. The present invention is characterized in that it is comprised of a figure-eight-shaped integrally molded valve having a movable lip portion formed to be able to open and close the annular suction passage and the annular discharge passage.

[Embodiments of the invention]

EMBODIMENT OF THE INVENTION The valve structure of the pump of this invention is demonstrated below using FIG. 2 and FIG. 3 using an Example. FIG. 2 is a longitudinal sectional view of the main part, and FIG. 3 is a detailed view of section A in FIG. 2. In the figure, 26 is a motor, 27 is a diaphragm support member, 28 is a crankshaft, and 29 is a diaphragm. The diaphragm 29 is fixed airtightly by the diaphragm support member 27 and the head plate 30 by clamping the peripheral edge thereof. A fixing screw 31 fixes the head plate 30 to the diaphragm support member 27. Reference numeral 32 designates an integrally molded valve made of an elastic material such as rubber, and as shown in detail in FIGS. It consists of a lip part 39 of a movable part that is thinner than the thick part 38 and extends inward from the thick part 38 to an air passage 40 formed in the center. The integrally molded valve 32 of this embodiment is formed into a figure 8 shape with two pieces placed next to each other, with the intake valve on the right side, and the intake valve on the right side;
The left side is configured as a discharge valve.

The integrally molded valve 32 is fitted into a recess formed in the head plate 30 so that the integrally molded valve 32 can be fitted into the head cover 33 which is fixed via a fixing screw 34.
The thick portion 38 also serves as a sealing portion and is fixed. At the lower part of the mounting part of the integrally molded valve 32, there is a suction port 4 as shown in FIG.
1, the annular suction passage 42 is connected to the suction passage 43.
It is formed on the circumference with the center at . The suction passage 43 is installed in the central air passage 40 of the integrally molded valve 32, and as shown in FIG. is communicated with. 44 is a discharge valve passage which communicates with an annular discharge passage 45;
is connected to the discharge port 35 through a discharge passage. Further, the discharge valve passage 44 communicates with the suction and compression chambers 4. And the air passage 4 of the integrally molded valve 32
0 and 40 communicate with the suction passage 43 and the discharge passage 46 of the head cover 33, and the lip portions 39 and 39 around the air passages 40 and 40 are attached to cover the suction annular passage 42 and the annular discharge passage 45. 36
is a connecting rod, and 37 is a ball bearing.

In the above structure, the rotational movement of the motor 26 causes the diaphragm 29 to reciprocate by the crankshaft 28 and the connecting rod 36, and when the diaphragm 29 descends as shown by arrow B, the head plate 30 and the diaphragm 29 The volume in the compression chamber 4 increases, and the air flows through the suction port 4
1→Annular suction passage 42, the lip portion 39 of the suction valve on the upper surface of the annular suction passage 42→Air passage 40→Suction passage 43. At this time, air does not flow because pressure is applied in the opposite direction to the lip portion 39 covering the annular discharge passage 45 of the discharge valve. When the diaphragm 29 rises in the opposite direction to arrow B, the volume of the suction and compression chambers 4 decreases, and the air flows from the discharge valve passage 44 to the annular discharge passage 45 to the lip of the discharge valve 39 to the air passage 40 to the discharge passage. 46→Discharge port 35
and is discharged. At this time, air does not flow through the lip portion 39 covering the annular suction passage 42 of the suction valve because pressure is applied in the opposite direction. By repeating this action, air is sucked in from the suction port 41 and negative pressure can be created.

In this way, the valve structure of the air compressor of this example is as follows:
The suction valve and the discharge valve are integrally formed from an elastic material,
The annular thick wall part also serves as a seal member and can be fixed airtight by omitting the installation of a gasket.Also, the thick wall part can be thinned from the thick part towards the air passage formed in the center of the annular part. The lip is formed to open and close the annular air passage formed so as to be covered by the lip, so the structure is extremely simple, the number of parts is significantly reduced, and the number of assembly steps is significantly reduced, reducing costs. can be significantly reduced.
Since the valve structure is simple, the head part, valve part,
The head covers can be overlapped and fixed at the same time, and airtightness can be ensured even if the valve seat is used as a synthetic resin molded product. Furthermore, it is also effective to provide a thread bead to ensure airtightness in the thick portion.

In addition, compared to the conventionally used valve similar to this embodiment, as described above, the four conventional parts are combined into one, and the number of parts can be significantly reduced on both the suction and discharge sides.

〔Effect of the invention〕

As described above, the valve structure of the pump of the present invention is
It has an extremely simple structure and has the effect of significantly reducing the number of parts and assembly work.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a valve part of a conventional air compressor, Fig. 2 is a sectional view of a main part of an embodiment of the valve structure of a pump according to the present invention, and Fig. 3 is a detailed view of part A in Fig. 2. 4 is a plan view of the head plate shown in FIG. 2, FIG. 5 is a plan view of the integrally molded valve shown in FIG. 2, and FIG. 6 is a sectional view taken along the - arrow in FIG. 4...Suction compression chamber, 29...Diaphragm, 3
0...Head plate, 32...Integrated valve, 33...
...Head cover, 38... Thick wall portion, 39... Lip portion, 40... Air passage, 42... Annular suction passage, 45... Annular discharge passage.

Claims (1)

[Claims] 1. A suction passage that communicates between a suction compression chamber formed by a diaphragm attached to a recess on one side of the head plate and an air passage formed by a head cover attached to a recess on the other side of the head plate. and a discharge valve passage, an annular suction passage provided in the head plate and communicating with the suction port with the suction passage as the center, and an annular discharge passage that opens at the center of the discharge valve passage and opens on the air passage side. an annular thick walled part inserted into the air passage provided with a discharge passage communicating with the outlet, made of an elastic material, and serving as a seal and blocking between the suction side and the discharge side; A figure 8 shape having a movable lip portion formed such that a portion leading to a fluid passage opened in the center is thinner than the thick portion, and capable of opening and closing the annular suction passage and the annular discharge passage. 1. A pump valve structure comprising an integrally molded valve.