JPH0210317Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of an unloader device in an unloader type air compressor.

[Prior Art] An air compressor in which an unloader device is attached to an air compressor, and when the pressure in a tank storing compressed gas exceeds a predetermined value, the unloader device is activated to perform no-load operation. A generally employed unloader device is installed in a gas suction chamber of a compressor main body, and is configured to receive pressure from the tank and open the compression chamber to the atmosphere.

However, the compressed air supplied from the tank via the pressure regulating valve is not only at high pressure but also generally contains relatively high temperature moisture, oil, etc., which can lead to corrosion and damage to the unloader device.
This may cause malfunctions such as decreased operating performance.

However, in conventional unloader devices, as seen in, for example, Japanese Utility Model Application No. 54-182405, a cylinder for guiding an unloader piston is formed in the cylinder head itself of the compressor body. When the function of the unloader piston deteriorates due to poor sliding, or when it needs to be replaced due to corrosion damage, the cylinder head itself must be removed or replaced, making maintenance cumbersome.
The drawback was that it was uneconomical.

Furthermore, the cylindrical portion of the lid that closes the opening of the guide portion and the fitting portion of the unloader piston are arranged in series in the same direction, resulting in an increase in the size of the compressor itself.

[Problems to be solved by the invention] The present invention has been made in view of the above-mentioned drawbacks of the prior art, and the problems to be solved by the invention are as follows:
The present invention provides an air compressor that is easy to maintain, lightweight, and compact.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention includes: a compressor body in which a suction chamber and a discharge chamber are formed by a cylinder head at the end of a cylinder having a compression chamber; a suction port provided in a partition wall that partitions a compression chamber and a suction chamber of the compressor body so as to communicate the two chambers; a valve body provided at an opening on the compression chamber side of the suction port; a hole formed in the cylinder head so that the other end is open to the atmosphere; and an unloader piston housed in the hole, one end of which abuts the valve body, and a seal ring provided on the outer periphery of the other end. , having a cylindrical part that is removably fitted to close the atmosphere opening part of the hole, the other end of the unloader piston being accommodated in the inner periphery of the cylindrical part, and providing a sliding surface for the seal ring. a lid body having a recess formed therein; a sealed chamber formed within the recess by the other end of the unloader piston and connected to a tank for storing compressed gas discharged from the compressor body; The air compressor consists of a spring that is energized in the direction of entry into the air.

[Example] Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 1, the air compressor that is the subject of the present invention includes an air compressor main body 1, a power source for driving the air compressor main body 1, such as an electric motor 2, and a power source that drives the air compressor main body 1. It consists of a tank 4 that stores compressed gas supplied through a discharge pipe 3. When the pressure of the compressed gas in this tank 4 exceeds the set pressure of the pressure regulating valve 5, the high pressure compressed gas in this tank The air compressor is guided to an unloader device provided in the suction chamber of the air compressor main body 1 to operate the unloader device, and thereafter the air compressor continues to operate without load until a predetermined pressure is reached.

The air compressor described above has been improved as described below.

As shown in FIG. 2, the cylinder head 6 of the air compressor main body 1 includes a suction chamber 7 and a compression chamber 17, which will be described later.
A hole 6a is provided at one end communicating with the suction port 8a of the partition wall 8 that partitions the two, and the other end is open to the atmosphere.
An unloader piston 9 is inserted into this hole 6a. The outer periphery of the cylindrical portion 10a of the lid body 10 is screwed into the portion of the hole 6a that is open to the atmosphere, and is closed. A recess 11 is provided on the inner periphery of the cylindrical portion 10a. The recess 11 has a sliding portion that slidably accommodates an end portion of an unloader piston 9 to which a seal ring 12, which will be described later, is attached. Note that a packing 14 is provided between the cylinder head 6 and the flange 10b of the lid 10.

The unloader piston 9 has a seal ring 12
A sealed chamber 15 is formed between the recess 11 of the lid 10 and the other end of the unloader piston via the connection port 10c from the storage tank 4.

The unloader piston 9 is pressed upward (in the direction of entering the recess 11) by a spring 13 provided in the hole 6a. A piston rod 9a is attached to the lower end of the unloader piston 9, and its tip extends through the suction hole 8a.
It is in contact with a suction reed valve 16 as a valve body provided on the compression chamber 17 side of a. FIG. 2 shows a state in which the suction reed valve 16 is forcibly opened by the unloader piston, and the suction chamber 7 and the compression chamber 17 are communicated with each other, and the compressor continues unloading operation. On the other hand, in the case of Fig. 3, the suction reed valve 1
6 indicates a closed state, and the compressed gas compressed in the compression chamber 17 pushes up the discharge valve 18, passes from the discharge chamber 19 through the discharge pipe 3, and is stored in the tank 4.

When the compressor continues to operate without load and the pressure of the compressed gas in the tank 4 falls below the set pressure, the pressure regulating valve 5 returns and the compressed gas acting on the unloader piston 9 is immediately released to the outside. , the compressor returns to normal operating condition.

[Effects of the invention] According to the air compressor of the invention configured as described above, the following effects are achieved.

Since the sliding surface of the unloader piston is formed on the inner periphery of the cylindrical part of the lid, it is more convenient than conventional models in which the cylindrical part of the lid and the fitting part of the unloader piston are arranged in series in the same direction. The dimension of the cylinder head in the longitudinal direction of the unloader piston is shortened, and the compressor main body can be made smaller.

Since a sliding surface with respect to the unloader piston is formed on the inner periphery of the cylindrical portion of the lid body, corrosion of the sliding surface due to entry of water droplets from the outside can be prevented.

Since the sliding surface with the unloader piston is formed on the inner periphery of the cylindrical portion of the lid, the material cost and weight of the lid can be reduced.

Since the sliding surface of the unloader piston is formed on the cylindrical portion of the lid which can be freely attached to and removed from the cylinder head, maintenance is easy and only the lid needs to be replaced, which is advantageous in terms of cost.

[Brief explanation of the drawing]

FIG. 1 is an overall view of the air compressor of the present invention, and FIGS. 2 and 3 are partially enlarged views of the main parts including the unloader device. DESCRIPTION OF SYMBOLS 1... Air compressor body, 6... Cylinder head, 7... Suction chamber, 8... Partition wall, 9... Unloader piston, 10... Lid, 11... Recess, 12
... Seal ring, 13 ... Spring, 15 ... Sealed chamber, 16 ... Unloader valve, 17 ... Compression chamber.

Claims (1)

[Claims for Utility Model Registration] A compressor body in which a suction chamber and a discharge chamber are formed by a cylinder head at the end of a cylinder having a compression chamber, and a partition wall that partitions the compression chamber and suction chamber of the compressor body. A suction port is provided to communicate the two chambers, a valve body is provided at the opening of the suction port on the compression chamber side, and a cylinder head is provided with one end facing the suction port and the other end being open to the atmosphere. an unloader piston that is housed in the hole and has one end in contact with the valve body and a seal ring on the outer periphery of the other end; a lid body having a cylindrical portion to which the unloader piston is fitted; a recess for accommodating the other end of the unloader piston in the inner periphery of the cylindrical portion and providing a sliding surface for a seal ring; A sealed chamber formed by the other end of the piston and connected to a tank that stores compressed gas discharged from the compressor main body, and a spring that biases the unloader piston in the direction of entering the recess. Air compressor features.