JPH0647682U - air compressor - Google Patents

Abstract

(57) [Summary] [Purpose] To suppress the temperature rise of the air sucked into the cylinder from the suction chamber in the cylinder head. In an air compressor in which a cylinder head 18 is mounted on a cylinder 13 in which a piston 12 reciprocates via a valve seat plate 14, a suction groove 15 and a discharge chamber 16 provided in the cylinder head 18 are cooled by a cooling groove 26. It is formed by separate peripheral walls 25 and 17, and heat transfer from the discharge chamber 16 to the suction chamber 15 is blocked by the air layer in the cooling groove 26.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reciprocating air compressor that compresses air by reciprocating a piston.

[0002]

[Prior art]

 Conventionally, in this type of air compressor, a valve seat plate 2 having a suction port 8 and a discharge port 10 is placed on a cylinder 1 in which a piston 9 is slidably mounted, as shown in FIG. A cylinder head 3 having a suction chamber 5 communicating with a suction port 8 and a discharge chamber 4 communicating with a discharge port 10 is placed on the valve seat plate 2, and the suction port 8 is further provided on the valve seat plate 2. The structure is such that a suction valve 8a that opens and closes and a discharge valve 10a that opens and closes the discharge port 10 are provided. In such an air compressor, the suction valve 8a opens in response to the downward movement of the piston 9, and the air is sucked into the cylinder 1 from the suction port 7 of the cylinder head 3 through the suction chamber 5 and the suction port 8. On the other hand, this air is compressed according to the upward movement of the piston 9, opens the discharge valve 10a, flows into the discharge chamber 4 from the discharge port 10, and is further supplied from the exhaust port 11 of the cylinder head 3 to the load.

[0003]

[Problems to be solved by the device]

 However, according to the above conventional air compressor, since the suction chamber 5 and the discharge chamber 4 in the cylinder head 2 are simply separated by the partition wall 6, the air heated in the compression stroke (compressed air The heat of (3) is directly transferred to the air in the suction chamber 5 through the partition wall 6, and as a result, the suction air into the suction chamber 5 is heated and expanded, and the compression efficiency is reduced. was there. In addition, when the temperature of the suction air becomes high in this way, the compressed air also becomes hotter, and as a result, the deterioration of the lubricating oil in the cylinder progresses, and the residue such as the carbide adheres to the suction valve 8a and the discharge valve 10a. There was also a problem that the smooth operation of these valves and pistons was hindered.

[0004]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and a valve seat plate having a suction port and a discharge port is provided on an upper portion of a cylinder in which a piston reciprocates. In an air compressor having a cylinder head having a suction chamber communicating with the intake port and a discharge chamber communicating with the discharge port on a valve seat plate, the cylinder head is formed of a single member, and The suction chamber and the discharge chamber are formed by a peripheral wall separated by a cooling groove.

[0005]

[Action]

 In the air compressor configured as described above, since the suction chamber and the discharge chamber in the cylinder head are formed by the peripheral wall separated by the cooling groove, the air layer in the cooling groove moves from the discharge chamber to the suction chamber. It blocks the transfer of heat and suppresses the heating of the suction air in the suction chamber.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 3, a valve seat plate 14 having a suction port 28 and a discharge port (not shown) is placed on a cylinder 13 in which a piston 12 is slidably mounted. A cylinder head 18 having a suction chamber 15 communicating with the suction port 28 and a discharge chamber 16 communicating with the discharge port is placed on the plate 14, and the suction port 28 is further opened / closed on the valve seat plate 14. A suction valve 29 and a discharge valve 31 for opening and closing the discharge port are provided. The cylinder head 18 is made of a single member (cast product), and is fixed to the cylinder 13 together with the valve seat plate 14 by bolts 19, 20, 21, 22.

As well shown in FIG. 1, the suction chamber 15 of the cylinder head 18 is formed near a center of one side of the upper surface of the cylinder head 18 by a peripheral wall 25 having a substantially triangular shape in plan view. The discharge chamber 16 is formed by a peripheral wall 17 that surrounds the peripheral wall 25 that forms the suction chamber 15 and has a spread over the entire upper surface of the cylinder head 18. A deeply cut V-shaped cooling groove 26 is formed between the peripheral wall 25 and the peripheral wall 17, whereby both outer wall surfaces 26a and 26b of the peripheral wall 25 on the suction chamber 15 side and the discharge chamber are formed. The outer wall surface 26c of the peripheral wall 17 on the 16th side comes to face through the air layer in the cooling groove 26 (FIG. 1).

An intake port 24 communicating with the suction chamber 15 is provided on the wall surface of the cylinder head 18 which is orthogonal to the valve seat plate 14. Here, the upper surface of the inner peripheral wall of the peripheral wall 25 forming the suction chamber 15 is inclined so as to approach the valve seat plate 14 from the intake port 24 toward the suction port 28. The exhaust port 32 communicating with the discharge chamber 16 is provided on the wall surface of the cylinder head 18 on the side opposite to the intake port 24. Further, the valve seat plate 14 is temporarily fixed to the cylinder head by using a bolt 27 through which the cylinder head 18 is inserted from above.

In the air compressor configured as described above, the external cool air sucked into the suction chamber 15 from the suction port 24 in response to the downward movement of the piston 12 opens the suction valve 29 and opens the suction port. It flows from 28 into the cylinder 13 and is compressed by the upward movement of the piston 12. Then, the compressed air flows into the discharge chamber 16 from a discharge port (not shown) and is supplied to the load side from the discharge port 32 while colliding with or in contact with the inner surface of the peripheral wall 17 forming the discharge chamber 16. . At this time, however, the compressed air generated by the piston 12 has heat, and this heat gradually heats the peripheral wall 17 forming the discharge chamber 16.

However, since the peripheral wall 17 and the peripheral wall 25 forming the suction chamber 15 are isolated from each other via the cooling groove 26 as described above, the air layer in the cooling groove 26 is sucked from the discharge chamber 16. The transfer of heat to the chamber 15 is blocked, whereby the heating of the suction air in the suction chamber 15 is suppressed, and the decrease in compression efficiency due to the rise in intake air temperature is prevented. However, since the heating of the intake air into the cylinder 13 is suppressed, the temperature rise of the compressed air is also suppressed as much as possible, and thus the deterioration of the lubricating oil in the cylinder 13 is also suppressed. Further, since the peripheral wall 17 forming the discharge chamber 16 is widely spread over the upper surface of the cylinder head 18, the heat dissipation of the discharge chamber 16 is extremely good, and the temperature rise of the compressed air can be further suppressed.

Further, in the present embodiment, the suction chamber 15 is limitedly formed in a narrow region of the cylinder head 18, and the upper surface of the inner peripheral wall of the peripheral wall 25 on the suction chamber 15 side extends from the intake port 24 toward the suction port 28. The air sucked from the intake port 24 smoothly flows into the suction port 28 without causing stagnation in the suction chamber 15, and the heating of the air in the suction chamber 15 is further suppressed. .

[0013]

[Effect of device]

 As described above in detail, according to the air compressor of the present invention, since the suction chamber and the discharge chamber in the cylinder head are formed by the peripheral wall separated by the cooling groove, the inside of the cooling groove is The air layer blocks the transfer of heat from the discharge chamber to the suction chamber, suppresses the heating of the air in the suction chamber, and prevents the decrease in compression efficiency due to the rise in intake air temperature. Moreover, since the intake air heating is suppressed, the temperature rise of the compressed air is also suppressed as much as possible, the deterioration of the lubricating oil is suppressed, and the operation of the valves and pistons is smooth for a long period of time. Furthermore, since the cylinder head is formed of a single member, assembly and disassembly are not complicated.

[Brief description of drawings]

FIG. 1 is a plan view showing a partially opened cylinder head that constitutes an air compressor according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view taken along the line BB of FIG.

FIG. 4 is a vertical sectional view showing a main part of a conventional air compressor.

[Explanation of symbols]

 13 Cylinder 14 Valve Seat Plate 15 Suction Chamber 16 Discharge Chamber 17 Peripheral Wall 18 Cylinder Head 24 Intake Port 25 Peripheral Wall 26 Cooling Groove 28 Suction Port 32 Exhaust Port

Claims (1)

[Scope of utility model registration request] 1. A valve seat plate having a suction port and a discharge port is provided on an upper part of a cylinder in which a piston reciprocates, and a suction chamber communicating with the intake port and a discharge chamber communicating with the discharge port are provided on the valve seat plate. In an air compressor provided with a cylinder head having, the cylinder head is formed of a single member, and the suction chamber and the discharge chamber are formed by a peripheral wall separated by a cooling groove. Compressor.