JPS62247191A - Discharge valve device for compressor - Google Patents

Abstract

PURPOSE:To improve the volumetric efficiency, by forming a discharge valve into a plunger type having a frusto-conical shape at its end. CONSTITUTION:A valve plate 4 is formed with a frusto-conical discharge hole 5 and a cylindrical suction hole 6. A plunger type discharge valve 11 having a frusto-conical shape at its end is inserted at its end into the discharge hole 5. Accordingly, when the discharge valve 11 is closed, a space of the discharge hole 5 is fully filled to eliminate a space where a refrigerant gas remains. Accordingly, no refrigerant gas reexpanding into the cylinder 3 exists, thus improving the volumetric efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in a discharge valve device for a compressor used in a refrigeration device such as a refrigerator or a near conditioner.

Conventional technology Refrigerators and near conditioners are also required to be more energy efficient, and there is a need to improve the characteristics of the compressors used in these refrigeration devices and reduce power consumption.

An example of a conventional discharge valve device for a compressor will be described below with reference to the drawings.

FIG. 2 shows a longitudinal sectional view of a conventional compressor discharge valve device.

In FIG. 2, 31 is a cylinder of a compressor, and 32 is a piston that reciprocates inside 33 of the cylinder.

A pulp grate 34 is provided with a cylindrical discharge hole 36 and a suction hole 36 .

Reference numeral 37 denotes a reed-type discharge valve that opens and closes the discharge hole 36, one end of which is fixed to the valve plate 34 with a bottle 38.

39 is a reed-type suction valve that opens and closes the suction hole, one end of which connects the valve plate 34 and the cylinder 3 with a pin 4o.
It is fixed between 1 and 1.

A cylinder head 41 includes a discharge chamber 42 and a suction chamber 43, and is fixed to the cylinder 31 via a valve plate 34 (not shown).

In the above configuration, when the piston 32 rises, the compressed refrigerant gas pushes up the discharge valve 37 from the discharge hole 36,
It flows out into the discharge chamber 42.

Here, bending stress acts on the reed-type discharge valve 37 when it is pushed up, and the opening of the valve is delayed, resulting in overcompression of the refrigerant gas.

Furthermore, at this time, the discharge valve 37 covers the opening of the discharge hole 36 through which the refrigerant gas flows out, and thus becomes a flow resistance for the discharged refrigerant gas.

The above-mentioned overcompression and flow resistance both result in increased power consumption.

Therefore, as methods for reducing losses due to overcompression and flow resistance, the width and thickness of the discharge valve 370 are reduced to reduce bending stress, and the portion that covers the opening of the discharge hole 36 is reduced. In some cases, the pressure is reduced to prevent overcompression and flow resistance by preventing a delay in opening the discharge valve 37 and reducing flow resistance.

Then, when the piston 32 starts to descend from the top dead center, 7
When the pressure inside the cylinder 33 decreases and becomes lower than the pressure in the suction chamber 43, the suction valve 39 opens and the refrigerant gas is sucked into the cylinder inside 33 through the suction hole 36.

At this time, the suction valve 39 does not open immediately even when the piston 32 begins to descend, but when the pressure inside the cylinder 33 becomes lower than the pressure in the suction chamber 43, a pressure difference is generated and the suction valve 39 opens.

Here, by the time the suction valve 39 opens, the refrigerant gas remaining in the discharge hole 36 during the discharge stroke expands into the cylinder interior 33 again.

This reduces the amount of refrigerant gas sucked.

That is, the suction amount is reduced by the amount of residual refrigerant gas that is re-expanded, and the volumetric efficiency of the compressor is reduced.

Therefore, as a method to prevent this decrease in suction amount and improve volumetric efficiency, for example, by reducing the diameter of the discharge hole 35 or reducing the thickness of the valve plate 34, the discharge hole 36
Volumetric efficiency may be improved by reducing the amount of refrigerant gas remaining in the tank.

Problems to be Solved by the Invention However, in the above configuration, the bending stress that is the force that opens the discharge valve 37 can be reduced by reducing the thickness of the discharge valve 37 or by reducing the width of the support portion of the discharge valve 37. Although methods are used to prevent overcompression and reduce flow resistance by reducing the size of the valve, the sealing performance of the discharge valve deteriorates, causing refrigerant gas in the discharge chamber 42 to leak into the cylinder interior 33, and reducing the lifespan of the discharge valve 37 itself. Due to such restrictions, it is difficult to make significant changes.In addition, if the diameter of the discharge hole 36 of the valve plate 34 is made smaller as a method of preventing re-expansion, the flow resistance of the refrigerant gas will increase. When reducing the thickness of the valve plate 34 to reduce the volume of the discharge hole 36, the valve plate 3
The mechanical strength of the valve plate 34 becomes weaker and the mechanical strength of the valve plate 34 becomes weaker.
As the thickness of the refrigerant gas becomes thinner, heat conduction becomes easier, leading to heat loss of the suction refrigerant gas due to the heat of the refrigerant gas in the discharge chamber 42, and the above method does not necessarily improve the characteristics of the compressor. had.

In view of the above problems, the present invention provides a discharge valve device that prevents overcompression, reduces flow resistance, and prevents a decrease in efficiency due to re-expansion.

Means for Solving the Problems In order to solve the above problems, the compressor discharge valve device of the present invention includes a cylinder constituting a compression element, a piston that reciprocates within the cylinder, and a small cone on the piston side. a valve plate having a trapezoidal discharge hole; a cylinder head mounted on the valve plate to form a discharge chamber and a suction chamber; and a cylinder head having a discharge valve holder at a position facing the discharge hole; The discharge valve has a truncated conical shape and has a plunger type discharge valve whose other end is installed in the discharge valve receiver, and a spring that presses the discharge valve into contact with the discharge hole.

Function: With the above-described configuration, the stress when the discharge valve is opened is adjusted to the necessary minimum by the spring that presses the discharge valve against the discharge hole, so that the pressure difference between the cylinder internal pressure and the discharge chamber pressure is minimized. The discharge valve can be opened at fewer points to reduce the pressure difference between the cylinder internal pressure and the discharge chamber internal pressure. In addition, since the opening/closing part of the discharge valve is opened and closed with the same size as the discharge hole,
Flow resistance due to the discharge valve shape is minimized and losses are reduced.

Furthermore, since the tip of the discharge hole opening/closing part of the discharge valve is shaped like a truncated cone to open and close, when the discharge valve is closed, the space in the discharge hole is filled and there is no space for the refrigerant gas to remain, so the refrigerant expands into the cylinder again. Gas runs out and the amount of refrigerant gas inhaled increases.

EXAMPLE Hereinafter, a discharge valve device according to an example of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is a cylinder of a compressor, 2 is a piston that reciprocates within the cylinder 1, and 3 is the inside of the cylinder formed by the cylinder 1 and the piston 2.

A valve plate 4 is provided with a truncated conical discharge hole 5 and a cylindrical suction hole 6.

A cylinder head 7 includes a discharge chamber 8, a suction chamber 9, and a cylindrical discharge valve receiver 10 protruding from a position facing the discharge hole 6.

The cylinder head 7 is fixed to the cylinder 1 together with the valve plate 4 by bolts (not shown).

Reference numeral 11 denotes a plunger-type discharge valve with one end shaped like a truncated cone, which opens and closes the discharge hole 5 . Reference numeral 12 denotes a coiled spring, which is mounted and supported on the discharge valve receiver 1o of the cylinder head 7. The discharge valve 11 has a truncated conical portion 1 at one end.
1' is located at the discharge port, and the other end 11' is inserted into the discharge valve receiver 1o via a spring 12.

A reed-type suction valve 13 opens and closes the suction hole 6, and one end of the reed-type suction valve is fixed between the valve plate 4 and the cylinder 1 with a pin 14.

In the above configuration, when the piston 2 in the cylinder 1 rises, the compressed refrigerant gas flows through the discharge hole 6 of the valve plate 4.
Push up the discharge valve 11 and spring 12 from the
to.

In conventional reed-type discharge valves, the opening force created by the pressure in the discharge chamber and the bending stress of the discharge valve itself acts, causing a delay in the opening of the discharge valve, resulting in overcompression of the refrigerant gas, but with the plunger type of the present invention, The opening force of the discharge valve 11, that is, the stress of the spring, is adjusted to a value close to zero to prevent the refrigerant gas in the discharge chamber 8 from leaking into the cylinder interior 3 to prevent overcompression. Since the truncated conical portion 11' is opened and closed over the entire inner peripheral surface of the discharge hole 6, the flow resistance of the discharged refrigerant gas is significantly reduced compared to a reed-type discharge valve.

Then, when the piston 2 begins to descend from the top dead center, the pressure inside the cylinder 3 decreases and becomes lower than the pressure in the discharge chamber 8.
A discharge valve 11 closes the discharge hole 6.

In this state, the discharge valve 11 and the discharge hole 5 are each shaped like a truncated cone and are in close contact with each other, so that the airtightness is good and the refrigerant gas does not leak.

Here, in conventional discharge valves, compressed refrigerant gas remains in the discharge hole communicating with the inside of the cylinder, but the plunger-type discharge valve 11 having a truncated conical portion 11' at the tip of the present invention , the discharge hole 6 itself is closed, and there is no space in the discharge hole 6 for the refrigerant gas to remain.

That is, re-expansion inside the cylinder 3 is prevented.

Effects of the Invention As described above, according to the discharge valve device of the present invention, the plunger-type discharge valve with a truncated conical tip eliminates the space in which refrigerant gas remains in the discharge hole, thereby preventing re-expansion into the cylinder. As a result, volumetric efficiency can be improved.

Furthermore, the stress of the spring is freely adjusted to minimize the opening force of the discharge valve to prevent overcompression, and compared to conventional glued valves, the size of the discharge valve is reduced to the size of the discharge hole and the refrigerant is discharged. It is possible to reduce gas flow resistance, reduce loss, and prevent an increase in power consumption.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a discharge valve device for a compressor according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing a conventional example. 1...Cylinder, 2...Piston, 3
...Inside the cylinder, 4...Valve plate, 6...Discharge hole, 6...Suction hole, 7
...Cylinder head, 8...Discharge chamber,
9...Suction chamber, 1o...Discharge valve receiver, 11.
...Discharge valve, 12... Spring, 11
′......Truncated cone shaped part. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
M-Series>4---Valve plate 5-Discharge hole Fig. 2

Claims (1)

[Claims] a cylinder constituting a compression element; a piston that reciprocates within the cylinder; a valve plate having a small truncated conical discharge hole on the piston side; and a valve plate attached to the valve plate to form a discharge chamber and a suction chamber; A cylinder head having a discharge valve receiver at a position facing the discharge hole, and a plunger type discharge having a truncated conical portion fitted into the discharge hole at one end and having the other end attached to the discharge valve receiver. A discharge valve device for a compressor, comprising a valve and a spring that presses the discharge valve into contact with the discharge hole.