JPS6140950Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compressor for a refrigeration system, and more particularly to the structure of a discharge valve in such a compressor.

FIG. 4 shows the structure of a discharge valve section of a conventional compressor. In this compressor, a valve seat 9 having suction ports 28, 28, . . . and discharge ports 29, 29, . ... is provided with an annular suction valve 10, and each of the discharge ports 29, 29... is provided with a return-shaped discharge port 11 facing each other.
The suction ports 28, 28, . . . and the discharge ports 29, 29, . The discharge valve 11 is pressed toward the valve seat 9 by a discharge valve spring 36 supported by a discharge valve holder 12 . Further, the discharge valve retainer 12 is pressed toward the valve seat 9 by a safety head spring 37 having a greater pressing force than the discharge valve spring 36, and is pressed together with the discharge valve 12 by the internal pressure of the working chamber 17 during liquid compression. The operating chamber 1 is moved upward against the spring force of the safety head spring 37.
It acts to rapidly reduce the pressure inside 7.

In this case, a plurality of guide protrusions 12a, 12a... are formed on the lower end surface of the discharge valve holder 12, while the guide protrusions 12a, 12a... It is fitted into an annular guide groove 8 formed outside the valve 29, and acts to guide the vertical movement of the discharge valve holder 12.

However, in this conventional compressor, the discharge ports 29, 29... are formed by a plurality of independent through-holes, so there is a certain limit to the total passage area, and therefore, it is difficult to operate during liquid compression. It was difficult to reduce the internal pressure of the chamber 17 rapidly, and as a result, the pressure inside the working chamber 17 became abnormally high, which could damage the head of the piston 5.

In addition, since the discharge valve holder 12 is not provided with a regulating member for regulating its upward movement height, in some cases, the discharge valve holder 12 may move up too much during liquid compression, causing the guide protrusions 12a, 12a. ... protruded from the guide groove 8, and furthermore, when the discharge valve holder 12 was returned to its normal position, it sometimes became impossible to operate the compressor.

In view of the above-mentioned problems with conventional compressors, the present invention divides the valve seat into an external valve seat fixed on the cylinder and an internal valve seat integrated with the discharge valve holder, and creates an annular discharge valve between the two. While forming the outlet, the internal valve seat can be moved upward together with the discharge valve holder during liquid compression, thereby increasing the passage area of the discharge port itself and making it possible to rapidly reduce the pressure in the working chamber. The main purpose is to tighten the discharge valve holder, and by providing a guide member that guides the vertical movement of the discharge valve holder and a stopper that regulates the height of the upward movement of the discharge valve holder, the return operation of the discharge valve holder is ensured. It was also done for the purpose of making it easier to get used to it.

Hereinafter, the compressor of the present invention will be described using a semi-hermetic refrigeration compressor Z shown in FIG. 1 as an example. 1st
In the figure, numeral 1 is the compressor section, 2 is the motor section, and 3 is the compressor section.
is a bridge groove, 4 is a compressor cylinder, 5 is a piston, 6
indicate the crankshaft. cylinder 4
As shown in FIG. 2, there is a valve seat 2 having an inlet 28 for inhaling gas and an outlet 29 for discharging gas.
5 is installed.

The valve seat 25 has a truncated cone-shaped hole 56 having an inner diameter smaller than the inner diameter of the working chamber 17 at a position corresponding to the inner center of the cylinder working chamber 17.
6, and an internal valve seat 27 in the shape of an inverted conical truncated cone, which is accommodated in the hole 56 with an annular gap between it and the inner circumferential surface 56a of the hole 56. An annular gap having a truncated conical cross section formed between the inner circumferential surface 56 a of the hole 56 of the external valve seat 26 and the outer circumferential surface 27 a of the internal valve seat 27 serves as the discharge port 29 . The external valve seat 26 includes the cylinder top surface 4a and the lower end surface 7a of the cylinder cover 7.
It is clamped and fixed between. This external valve seat 26
Inside, there is an intake gas passage 22 on the cylinder cover 7 side.
Suction ports 28, 28... which communicate the working chamber 17 with the
...is formed. This intake port 28, 28...
In the piston top surface 4a, an annular suction valve 10 housed in a valve receiving portion 50 formed on the outer circumference of the working chamber mouth edge is disposed so as to face the suction ports 28, 28... ing. This suction valve 10 is pressed toward the valve seat 25 by a suction valve spring 35. Further, an annular discharge valve 11 is disposed at the discharge port 29 so as to face the discharge port 29 . This discharge valve 11 is pressed toward the valve seat 25 by discharge valve springs 36, 36, . . . supported by a discharge valve holder 12.

The internal valve seat 27 is integrally coupled with a fastening bolt 32 to the discharge valve holder 12 which is pressed toward the external valve seat 26 by a safety head spring 37 having a larger pressing force than the discharge valve spring 36 . Therefore, this internal valve seat 27 can move up and down together with the discharge valve holder 12 when the pressure in the working chamber 17 is abnormally high (during liquid compression). When the internal valve seat 27 moves upward, the opening area on the outlet side of the discharge port 29 is increased (see FIG. 3).

A plurality of guide pins 42, 42, . The tip side of each guide pin 42, 42... is a discharge valve holder 12.
A deep pin receiving hole 5 formed in the lower end surface 12b of
1, 51... is slidably inserted into the inside. The guide pins 42, 42, . . . act as guide members when the discharge valve holder 12 moves up and down. Further, a plurality of stoppers 55 are formed on the inner surface 24 of the cylinder cover 7 to restrict the upward movement height of the discharge valve holder 12 by engaging with the shoulder portion 12a of the discharge valve holder 12 in the cylinder axial direction. There is. By appropriately setting the height position of this stopper 55, the guide pins 42, 42, . . .
1, 51... so that it does not deviate from the range. Therefore, even if the discharge valve holder 12 moves up to the upper limit position during liquid compression, the guide pins 42, 42...
You will be guided and seated in the correct position.

When the illustrated compressor Z is in operation, low-pressure refrigerant gas Ga (solid arrow) is sucked into the motor chamber 19 through the gas inlet 20, and the suction gas passage 2
2 into the cylinder working chamber 17 through the intake ports 28, 28, . . . of the valve seat 25.

High pressure refrigerant gas Gb pressurized in the working chamber 17
(Dotted arrow) indicates the discharge port 2 by pushing open the discharge valve 11.
9 into the discharge gas passage 23, and is further fed from the gas outlet 21 toward a condenser (not shown).

Furthermore, when the pressure within the working chamber 17 becomes abnormally high due to liquid compression, the internal valve seat 27 moves upward together with the discharge valve holder 12, acting to rapidly reduce the pressure within the working chamber 17.

At this time, when the discharge valve holder 12 moves upward,
The shoulder portion 12a abuts against the stopper 55, and when the pressure decreases and returns to the original position, the shoulder portion 12a is guided by the guide pins 42 and is securely seated at the normal position.

Incidentally, reference numeral 40 is an unloading pin that interlocks with the unloading piston 41, and acts to forcibly open the suction valve 10 during no-load operation. In this embodiment, the unload piston 41 operates as follows.

That is, the gas passage 60 communicating with the pressure receiving chamber 61 of the unload piston 41 is connected to the unload detecting member 6.
2 in the high-pressure gas circuit 64 and the low-pressure gas passage 6 in the refrigerating gas circuit via a switching valve 63 controlled by
5, and communicates with the high pressure gas circuit 64 during normal load operation, and is connected to the unload detection member 62.
It communicates with the low pressure gas circuit 65 only when it detects a no-load operating state. Therefore, the unload piston 41 is in the pressure receiving chamber 6 during load operation.
However, during no-load operation, the gas pressure in the pressure receiving chamber 61 becomes low, so the unload piston spring 66
The suction valve 10 is moved downward by the spring force of the unload pin 40, and acts to forcibly open the suction valve 10 via the unload pin 40.

Next, to explain the effects of the present invention, according to the compressor of the present invention, the valve seat attached to the upper part of the cylinder is divided into an internal valve seat and an external valve seat, and a wide-area annular discharge is formed between the two. By forming an outlet and making the internal valve seat movable together with the discharge valve holder, the passage area of the discharge outlet can be further increased during liquid compression. When the pressure in the working chamber becomes abnormally high, the pressure in the working chamber can be rapidly reduced through the discharge port with a wide passage area, preventing damage to the top of the pinton, etc. due to abnormally high pressure in the working chamber, and improving the durability of the compressor. It has the effect of improving sexuality.

In addition, the vertical movement of the discharge valve holder is guided by a guide member such as a guide pin, and the height of the upward movement is restricted to a constant height by a stopper, thereby ensuring that the discharge valve holder is moved from the upward movement position. Since it can be returned to the normal position, it is practical because it can prevent troubles such as the discharge valve holder moving up too much during liquid compression and coming off the guide member and not returning to the specified position. It's also effective.

[Brief explanation of drawings]

Fig. 1 is an overall vertical sectional view of a compressor according to an embodiment of the present invention, Fig. 2 is an enlarged view of a portion of Fig. 1, and Fig. 3 is a state diagram of the discharge valve section shown in Fig. 2 during liquid compression. , 4th
The figure is a sectional view of essential parts of a conventional compressor. 7...Cylinder cover, 11...Discharge valve, 12
...Discharge valve holder, 17...Cylinder internal working chamber, 2
5... Valve seat, 26... External valve seat, 27... Internal valve seat, 28... Suction port, 29... Discharge port, 36...
Discharge valve spring, 37... Safety head spring, 42... Guide pin, 55... Stopper, 56... Hole, 56
a... Inner peripheral surface of the hole.

Claims (1)

[Scope of utility model registration request] A valve seat 25 having an inlet 28 for gas suction and an outlet 29 for discharging gas is covered above the working chamber 17 in the cylinder, while a discharge valve 11 for opening and closing the outlet 29 is controlled by a discharge valve holder 12. The discharge valve holder 12 is pressed against the valve seat 25 by a safety head spring 37 having a greater pressing force than the discharge valve spring 36. In the compressor, the valve seat 2
5, an external valve seat 26 having a hole 56 with an inner diameter smaller than the inner diameter of the working chamber 17 at a position corresponding to the inner center of the working chamber 17, and an inner peripheral surface 56a of the hole 56 inside the hole 56; The internal valve seat 27 is housed with an annular gap in between, and the annular gap is used as the discharge port 29, and the discharge valve holder 12 and the internal valve seat 27 are integrated. A discharge valve presser guide member such as a guide pin 42 that guides the vertical movement of the discharge valve presser 12 and the upward movement height of the discharge valve presser 12 are connected in the cylinder cover 7 that covers the outside of the valve seat 25. A compressor characterized in that it is provided with a stopper 55 for regulating.