JPS6035189A - Multi-cylinder single stage compressor of vertical single row - Google Patents

Abstract

PURPOSE:To prevent cylinders being partly or one-sided worn by piling said cylinders formed into the same shape to form them into a vertical single row multi-cylinder type, and connecting pistons with piston rods freely to incline. CONSTITUTION:The first cylinder 1 and the second cylinder 2 both formed into the same shape are piled up to form them into a vertical single row multi-cylinder type, while sliding surfaces 64, 66, 75, 77 are formed on the first piston 6 and the second piston 7. A spherical head end part 91 and a spherical end edge part 92 are formed on a piston rod 9. The sliding surfaces 64, 66, and the spherical head end part 91 are engaged with each other, while the sliding surfaces 75, 77 and the spherical end edge part 92 engeged with each other. Hereby, the pistons 6, 7 and the piston rod 9 are connected with each other freely to incline, so that the piston rod 9 transmits only force for vertical motion along a shaft, allowing the pistons 6, 7 to move following the cylinder surface. Thus, it is possible to prevent the cylinder surfaces from being partly or one-sided worn.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical single-row, multi-cylinder, single-acting, single-stage compressor configured to stack identically formed cylinders.

In the conventional example, when a compressor with a low final pressure is configured to have multiple cylinders to prevent the cylinder diameter from becoming too large, a parallel or seven-row cylinder arrangement is usually used. However, the parallel type or seven-row type compressor has the problem that as the number of cylinders increases, the manufacturing cost of the compressor increases significantly and the installation area also increases.

In addition, the compressor has a high final pressure and uses a multi-stage compression method.
In horizontal or vertical stream-shaped cylinders, multiple pistons are connected by a single piston rod on the axis of the cylinder, but the connection between the piston and piston rod is not fixed. Therefore, the movement of the piston is restricted by the movement of the piston rod, which causes the problem of uneven wear of the inner surfaces of the cylinder. The inner peripheral surface of the cylinder and the outer peripheral surface of the piston face each other with a small amount of play, and the airtightness inside the cylinder is maintained.
A piston ring is inserted into a plurality of ring grooves provided in the piston so as to be able to expand and contract in the radial direction. Therefore, if there is even a slight inclination in the connection between the piston and the piston rod, the piston will follow the inclination of the piston rod, causing uneven wear on the cylinder surfaces. This invention solves these problems by stacking identically formed cylinders to form a vertical single-row multi-cylinder structure, and by connecting the piston and piston rod so as not to bind them against the inclination of the cylinder. The object of the present invention is to provide a single-acting, single-stage, low-pressure compressor that is formed to eliminate uneven wear of the compressor.

This invention will be explained in detail based on illustrated embodiments.

FIG. 1 is an explanatory cross-sectional view with a portion of a vertical single-row, two-cylinder, single-acting, single-stage compressor according to the present invention removed. In the figure, 1 is the first cylinder, 2 is the second cylinder, 3 is the drive base, 4 is the cylinder head, 5 is the intermediate head, 6 is the first piston, 7 is the second piston, 9 is the piston rod, and 10 is the connection The rod 11 is a crankshaft.

The first cylinder 1 and the second cylinder 2 are formed into cylindrical bodies with flanges, and have the same inner diameter, axial length, and wall thickness. In addition, when providing a cooling water canopy on the outer periphery, it is all formed in the same manner. Further, the connecting portion of the driving base 3 and the second cylinder 2 is formed in the same manner. The first cylinder 1, the second cylinder 2, and the drive base 3 are formed by joining their flanges and bolting together so that their axes are exposed. The cylinder head 4 is formed into a circular shape having the same outer diameter as the outer diameter of the flange of the first cylinder 1.

That is, the cylinder head 4 is also connected to the upper flange of the first cylinder 1, and is attached by bolting. Further, the cylinder head 4 is formed by providing an intake valve 41 and a discharge valve 42 at symmetrical positions on the diameter of a large circle. In this case, the intake valve 41
The valve body 43 of the discharge valve 42 and the valve body 44 of the discharge valve 42 are formed in a plate shape having a conical valve seat surface, and are formed so that the bottom of the valve body does not protrude into the first cylinder 1 when the valve body is not in operation. intermediate head 5
is also formed into a circular shape with the same dimensions as the outer diameter of the flange of the first cylinder 1 (5
) do. That is, the intermediate head 5 is formed so as to be attached to the flanges of the first cylinder 1 and the second cylinder 2 in a sandwiched manner and bolted together.

Further, as shown in FIG. 3, the intermediate head 5 includes an intake valve 51 whose valve seat surface is provided on the second cylinder 2 side at a symmetrical position on the diameter of a large circle.
and a discharge valve 52 are provided and formed. The intake valve 51 and the discharge valve 52 are formed in the same shape as the intake valve 41 and the discharge valve 42 of the cylinder head 4, but the intake port 53 and the discharge port 54 are formed to open on the circumferential side of the intermediate head 5.

Furthermore, as shown in FIG. 4, a pair of ventilation holes 56.5 are opened toward the first cylinder 1 side and communicate with the intake and exhaust ports 55 on the circumferential side.
7 is provided and formed. Further, a through hole 58 into which the piston rod 9 is inserted and a plurality of seal grooves 59 are provided in the center of the circular intermediate head 5. The first piston 6 is formed into a thin-walled cylindrical shape, and has a plurality of +7 puffer grooves 6 on the outer peripheral surface.
1 is provided and formed. Furthermore, an arm 62 is provided on the inside, and a boss portion 63 is formed at the center. This boss portion 63 is formed into a spherical shape having a center on the axis of the first piston 6 (4
) A fitting hole 65 having a sliding surface 64 is provided, and a connecting lid 6T having the same spherical sliding surface 66 is screwed and connected;
The inner surface of the spherical portion formed by the sliding surface 64 of the boss portion 63 and the sliding surface 66 of the coupling lid 6T comes into sliding contact with the spherical head end 91 formed on one end edge of the piston rod 9. Form it like this. The connection between the inner surface of the spherical part formed by the pawl sliding surface 64 and the sliding surface 66 and the spherical head end 91 transmits only vertical movement along the axis, and prevents rotations and oblique tilts. Form it so that it is free.

The second piston T is formed into a thin cylindrical shape and is formed with a plurality of ring grooves γ1 on the outer peripheral surface.

Further, a through hole T2 into which the piston rod 9 is inserted is formed in the center, and a seal ring groove 73 is formed. The seal ring groove 73 is formed to have a slightly larger gap type than a sliding fit type, and is formed to use a large snap type sealing material. Further, a boss portion 14 is formed inside the through hole 72 on the axis thereof, and a fitting hole 76 having a spherical sliding surface 75 is provided in the same way as in the first piston 6. The coupling lid 18 having a sliding surface 77 is screwed on to supply liquid. The spherical inner surface formed by the sliding surface 15 and the sliding surface 17 is formed to be in sliding contact with the spherical end edge 92 that is threadedly connected to the other end edge of the piston rod 9. do. Further, a pin boss 8o is formed in a direction perpendicular to the axis and spaced apart from the coupling lid T8, into which a piston pin 81 is inserted. In this case, the pin boss 8 into which the piston pin 81 is inserted
The pin hole 82 formed at o is provided with a cover 84 at the opening on the circumferential side of the second piston γ, and is sealed so as not to allow ventilation, so as to prevent the formation of an oil film on the circumferential side when the second piston γ is lowered. Form it like this.

Further, the bearing portion 101 of the 1° continuous rod that forms a rotating pair with the piston pin 81 is formed using a ceramic material in order to cope with high loads. The ceramic material is formed into a thin cylindrical shape, and is inserted into and locked into the bearing boss 102. Further, the bearing portion 111 of the connecting rod 10 with respect to the crankshaft 11 is also formed by lining with a thin ceramic material. Thus, the spherical head end 91 of the piston rod 9 is connected to the first piston 6, and at the same time, the piston rod 9 is inserted into the through hole 58 of the intermediate head 5 and the through hole γ2 of the second piston 1. The spherical end edge 92 is connected to the other end edge, and the bearing part 101 of the connecting rod 10 is connected with the piston pin 81. In this state, the first piston 6 is inserted into the first cylinder 1, and then the second piston 6 is inserted into the first cylinder 1.
The piston 7 is inserted into the second cylinder 2 from below, and the cylinder head 4 is mounted on the first cylinder 1 and connected by Holt, and at the same time, the second cylinder 2 is connected onto the drive base 3. crankshaft 11
As the first piston 6 and second piston 7 rotate, the first piston 6 and the second piston 7 simultaneously reciprocate up and down and repeat the intake and discharge strokes. In this case, the first cylinder 1 due to the descent of the first piston 6
The lower air inside is exhausted from the ventilation holes 56, 5γ of the intermediate head 5, and is taken in when rising. One piece 1st. Both the cylinder 6 and the second cylinder T form a single-acting, single-stage compression stroke.

Since this invention is constructed as claimed in the claims based on the above-mentioned embodiment, the cylinders formed into multiple cylinders can be processed into the same shape, so the processing process is unified, and the manufacturing cost can be greatly reduced. becomes. In addition, since the piston (7) and the piston rod are connected to each other so that they can tilt freely, the piston rod only transmits the force of vertical movement along the axis, and the piston moves along the cylinder surface, causing uneven wear on the cylinder surface. This will be alleviated. Furthermore, since the bearing part of the connecting rod is made of ceramic, it can easily withstand high loads and is less likely to wear out. Moreover, since it is a single row, it is possible to provide a vertical single row multi-tube compressor that requires less installation space and is highly durable and inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory view with a part removed of a vertical single-row, two-cylinder, single-acting, single-stage compressor; Fig. 2 is a cross-sectional explanatory view of a cylinder head;
FIG. 3 is an explanatory sectional view of the intermediate head, and FIG. 4 is an explanatory sectional view taken in a right angle direction thereof. Explanation of symbols 1...1st cylinder, 2...2nd cylinder, 3...
Drive base, 4... cylinder head, 5... intermediate head,
6...First piston, T...Second piston, 9...
・Piston rod, 10...Connection rod, 11...Crankshaft, 4i51...Intake valve, 42.52...Discharge (
8) Valve, 53...Intake port, 54...Discharge port, 55...
Intake/exhaust port, 56.57...Vent hole, 58.72...
Through hole, 59... Seal groove, 61, 71 IJ groove, 63... Boss part, 64.66.75°17... Sliding surface, 65, 76... Fitting hole, 61゜γ8...Joining lid, 13...Seal ring groove, 80...Pin boss,
81... Piston pin, 82... Bottle hole, 91...
- Spherical end, 92... Spherical end, 101.111
...Bearing part, 1o2...Bearing boss Patent applicant Tokyo Parts Industry Co., Ltd.

Claims (1)

[Claims] In a vertical single-row multi-cylinder compressor, the first cylinder 1 and the second cylinder 2, which are formed into multiple cylinders, are formed into the same flange-shaped cylinder shape, and the first cylinder
The intake valve 41 and the discharge valve 42 of the cylinder 1 are provided on a cylinder spatula lI'4 connected to the upper edge of the first cylinder 1, and the intake valve 51 and the discharge valve 52 of the 1st and 2nd cylinders 2 as well as the 1st cylinder 1 1
An intake/exhaust port 55 is provided in the intermediate head 5 which is clamped and connected to the flanges of the first cylinder 1 and the second cylinder 2. The piston rod 9 that connects the second piston T is formed with a spherical head end 91 and a spherical end 92 each having a spherical surface on the end edge. It is formed by providing a fitting hole 65 and a coupling lid 6T for freely coupling the two at an angle,
At the same time, the second piston 7 is provided with a fitting hole 76 and a coupling lid 78 which are freely coupled with the spherical end portion 92, and a second piston 7 is formed.
A vertical single-row, multi-tube, single-stage compressor characterized in that bearings 101 and 111 of a connecting rod 10 connecting a piston γ and a crankshaft 11 are made of a ceramic material.