JPH0133828Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the technical field of the structure of a piston type air compressor device.

<Summary> This invention relates to a structure in which the cylinder head of an air compressor has a suction port on one side and a discharge port on the other side, and an unloader valve is attached to the suction port. In particular, a recess is provided on the side of the cylinder head facing the piston so that its upper surface is close to the top dead center surface of the piston, and a valve plate is attached to the upper surface of the recess so that the piston reaches the top dead center. This invention relates to a cylinder head structure that is an air compressor that reduces the amount of compressed air remaining when compressed air is as much as possible, and has an excellent heat transfer effect.

<Prior Art> Conventionally, as shown in FIG. 1, in a lead type air compressor 1, heat dissipation fins 2,
A cylinder 3 having a cylinder 2 has a piston 4 fitted therein so as to be able to slide up and down with respect to the cylinder 3, and a cylinder head 5 is fitted into an opening at the top of the cylinder 3 with a gasket. It has a valve plate 8 to which valves 6 and 7 are attached, and are integrally fixed through a valve seat 9.

Thus, an inlet 10 is provided on one side of the outer peripheral surface of the cylinder head 5, and a discharge port 11 is provided on the other side.
Further, a valve plate 12 faces the valve seat 9, and a predetermined valve device fixed by a fixing screw 14 via a valve guard 13 is provided.

Note that 15 is a fixing screw for fixing the valve plate 8 to the valve seat 9.

Furthermore, in an air compressor 1' with an unloader valve as shown in FIG. 2, a cylinder head 5' is hermetically attached to the opening of the cylinder 3 and the piston 4 via a gasket 7. A suction port 10 and a discharge port 11 are provided on its outer peripheral surface, and a valve holder 16 is screwed onto the piston 4 side on the suction port 10 side. A suction valve device attached to the seat 19 is provided, a valve case 20 is screwed onto the cylinder head 5' above the suction valve device, and a spring 21 is screwed onto the cylinder head 5'.
An unloader piston device is provided through which an unloader valve 22 is provided.

On the other hand, on the discharge port 11 side of the cylinder head 5',
Plate valve 24 sandwiching the valve seat 23
In contrast, a valve holder 27 with a gasket 26 in between via a spring 25 is fixed by a cap 28 to form a discharge valve device.

<Problem to be solved by the invention> Therefore, in the conventional type air compressor 1, 1', valve seats are provided for each of the suction valve device and the discharge valve device separately from the cylinder heads 5, 5'. 9, 23, 19, and also requires a fixing screw 15, valve holder 16, etc. for tightly fixing the valve seats 9, 23, 19 to the cylinder head 5, 5', which makes the structure complicated. There is.

In addition, the mating surfaces of the valve seats 9, 23, 19 and the cylinder heads 5, 5' require high-precision surface machining to prevent air leakage, and gaskets, etc. may be additionally used. It also had the disadvantage of increasing costs, and also caused problems such as poor tightening and thermal distortion.

Furthermore, these valve devices are connected to the cylinder head 5,
Since it is provided between 5' and cylinder 3,
Another problem was that the volume for accommodating residual air at the top dead center of the piston 4 increased, resulting in a decrease in compression efficiency.

In addition, since these valve devices are located in the areas that reach the highest temperature during adiabatic compression operation, the heat dissipation effect is reduced.
Another disadvantage was that the heat insulation effect was not sufficient.

<Purpose of the invention> The purpose of this invention is to solve the various problems of the air compressor based on the above-mentioned conventional technology as a technical problem, without complicating the structure and without high-precision surface machining. To provide an excellent air compressor cylinder head structure that reduces the volume of residual air at the top dead center of the piston and improves the heat dissipation effect, thereby benefiting the field of thermal technology application in the energy industry. That is.

<Means/effects for solving the problem> In accordance with the above-mentioned purpose, the structure of this invention, which is summarized in the scope of the above-mentioned utility model registration claim, is to solve the above-mentioned problem. The concave portion on the side opposite to the cylinder head is provided so that the lower surface of the valve plate of the suction valve is aligned with the lower parting surface of the cylinder head, and the valve seat portion formed integrally with the cylinder head is provided with a concave portion of the discharge valve. We have taken technical measures to prevent air leakage from the cylinder head by installing a valve plate, reduce the amount of compressed residual air at the top dead center of the piston, and improve thermal conductivity to reduce heat generation. It is something.

<Example> Next, an example of this invention will be described below based on FIGS. 3 and 4.

The embodiment shown in FIG. 3 is an embodiment of a lead type air compressor 1'', and the air compressor 1'' is made of aluminum die-casting on the upper opening side of a cylinder 3 in which a piston 4 is slidably provided. A cylinder head 5'' made of aluminum is installed in a predetermined position on the piston 4 side by forming a recess 51 of a slight depth in which the lower surface of the valve plate 35 coincides with the lower parting surface of the cylinder head 5''. A suction port 10 is formed on one side of the circumference of the cylinder head 5'', and a discharge port 11 is formed on the opposite side, and an exhaust chamber 29 on the side of the discharge port 11 is die-cast integrally with the cylinder head 5''. A discharge valve plate 31 made of a predetermined material is provided on the upper part of the valve seat 30.
is held by a valve guard 32 and a fixed screw 33.

A gasket 34 is interposed in the shoulder between the cylinder head 5'' and the cylinder 3, and a valve plate 35 as an intake valve is attached to a fixed screw 36 on the lower surface of the recess 51 of the cylinder head 5''.
is fixed.

Therefore, the gap between the lower surface of the valve plate 35 and the top dead center surface of the piston 4 is extremely small.

In the above configuration, when the piston 4 is moved up and down in a predetermined manner, the valve plate 35 of the intake valve opens.
Air is sucked in through the suction port 10, and the valve plate 31 of the discharge valve opens to exhaust the compressed air. In this process, when the piston 4 reaches the top dead center, its upper surface and the valve plate 35 Since the gap with the lower surface is small and the volume of the recess 51 is small, the volume of residual air is small, and the air compressed by the piston 4 becomes high temperature due to adiabatic compression, so this high temperature is transferred to the cylinder head. 5'' and is radiated outside the system.

The embodiment shown in FIG. 4 shows an embodiment of a cylinder head with an unloader valve, and this idea is applied. The head 5 is fixed via a gasket 34.

In addition, in this embodiment, the cylinder head 5
Although only the suction port 10 side is shown, the other side, i.e.
The discharge port side is constructed in the same manner as the embodiment shown in FIG. 3 above. Also, the recess 5 on the lower side of the cylinder head 5
The gap between the valve plate 35 provided on the top surface of the piston 4 and the surface of the top dead center of the piston 4 is small as in the above embodiment.

A valve plate 35 is attached to the lower part of the air chamber 37 on the side of the intake port 10 of the cylinder head 5, and a spring 38 and an unloader valve 39 are attached above the valve device between the valve plate 35 and the cylinder head 5. valve case 40
An unloader valve device is provided.

The unloader valve 39 presses the valve plate 35 during a predetermined compression cycle to forcibly open and close the valve device.

Therefore, in this embodiment, the structure is significantly simplified compared to the conventional device, and the same effects as in the embodiment of FIG. 3 described above are achieved.

<Effects of the invention> As described above, according to this invention, since the cylinder head and cylinder are directly connected, the structure is not only simple, but also has excellent effects such as good heat dissipation effect. Since the suction valve device and the discharge valve device are integrated with the cylinder head,
The mechanism is extremely simple, there is no need to tighten the valve seat, there is no need for advanced precision surface machining, and the cylinder head can be manufactured using only precision die casting, which has the advantage of significantly reducing costs.

In this invention, the valve plate is directly installed in a slightly deep recess formed in the cylinder head so that a gap is formed in which the lower surface of the valve plate and the upper surface of the piston at the top dead center are extremely close to each other, so that the valve plate cannot be tightened. Another advantage is that there is no risk of air leakage due to defects or thermal distortion.

In addition, because the gap between the lower surface of the valve seat of the intake valve of the cylinder head and the upper surface of the piston's top dead center is small, it is possible to reduce residual compressed air and increase the compression ratio. Furthermore, re-expansion of the compressed air can be minimized, and to that extent, there is also the effect of increasing the amount of intake air and improving the volumetric efficiency.

Furthermore, die-cast products are dense and hard, and the seat part is pounded by the valve plate to accelerate surface hardening, resulting in very little wear on the seat part even in the absence of lubricating oil. It has the advantage of being able to withstand long-term use.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view of a conventional lead type cylinder device, FIG. 2 is a side cross-sectional view of the same unloader type cylinder device, and FIG. 3 is a side sectional explanatory view of an embodiment applied to a lead type cylinder device, and FIG. 4 is an explanatory view applied to an unloader type cylinder device. 5'', 5... Cylinder head, 10... Suction port, 51... Recess, 11... Discharge port, 35, 31
... Valve device, 4... Piston, 35... Valve plate (intake valve), 31... Valve plate (discharge valve).

Claims (1)

[Scope of utility model registration request] Cylinder head of a piston compression type air compressor In a cylinder head structure having an inlet and an outlet as well as a valve device, a recess of a slight depth is formed on the piston side of the cylinder head, and a recess is formed within the recess. a valve plate of the intake valve is provided so that its lower surface is close to the lower parting surface of the recess;
A cylinder head structure for an air compressor, characterized in that a valve plate of a discharge valve is provided on a valve seat portion formed integrally with the cylinder head.