JP2003156259A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor with a bypass pipe having a relief valve between an interior of a high pressure side sealed container and a low pressure side accumulator, suppressing pressure rise in the sealed container under the conditions of a high ambient temperature and assuring durability and reliability. SOLUTION: The compressor comprises a high internal pressure type compressor unit 1 having a motor 2 and a compression part 3 arranged in the sealed container 1a and an accumulator 12 annexed to the compressor unit 1 and having an inlet pipe 12a and an outlet pipe 12b, the outlet pipe 12b of the accumulator 12 being connected to a suction port 6 of the compression part 3. A motor chamber 2a and a gas space d of the accumulator 12 are connected via the bypass pipe 16 having the relieve valve 15 which is opened/closed with a differential pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal high pressure type compressor provided with an accumulator, and more specifically, a bypass pipe provided with a release valve is provided in a high pressure hermetically sealed container and between low pressure accumulators for sealing. The present invention relates to a device for suppressing an increase in pressure inside a container.

[0002]

2. Description of the Related Art For example, a conventional compressor is a rotary compressor shown in FIG. In the figure, a compressor 1'has an electric motor 2 arranged vertically inside a hermetically sealed container 1a ', and a compression section 3 driven by the electric motor 2. The compression unit 3
Is a crankshaft 4 having an eccentric shaft portion 5 for transmitting the rotational force of the electric motor 2 to the compression portion 3, and a cylinder 7 having a suction port 6 and a discharge port (not shown) on the inner surface of the cylinder.
And an upper bearing 8 and a lower bearing 9 which are arranged at both axial ends of the cylinder 7 and rotatably support the crankshaft 4.
And an annular roller which moves along the inner surface of the cylinder of the cylinder 7 and whose inner peripheral portion is rotatably fitted to the eccentric shaft portion 5.
It is composed of 10 and. Reference numeral 6 a is a suction pipe that communicates with the suction port 6, sucks low-pressure refrigerant from the accumulator 22, and supplies the low-pressure refrigerant to the compression unit 3. Also, the piston 10
A compression chamber 11 is formed by the outer peripheral surface of the cylinder 7 and the inner surface of the cylinder of the cylinder 7.

The thrust bearing 4a of the crankshaft 4 is brought into contact with and supported by the lower bearing 9, and the lower end of the crankshaft 4 is dipped in the lubricating oil 13 accumulated on the bottom surface of the hermetically sealed container 1a '. 4, the lubricating oil 13 is pumped up through the hollow portion 4b of the crankshaft 4 and the pumped lubricating oil 13 is supplied to each portion.

The accumulator 22 has an inlet pipe at the upper end.
An outlet pipe 22b is attached to a lower end portion of 22a, and the outlet pipe 22b is formed so that an upper end opening portion 22b1 is located inside the accumulator 22 slightly above an intermediate height, and a lower end thereof is the compression portion 3b. Is connected to the suction pipe 6a. Then, an anti-spherical screen (not shown) is attached between the inlet pipe 22a and the outlet pipe 22b together with a baffle plate 22c having a refrigerant flow hole, and the inlet pipe 22a is arranged inside the accumulator 22. The gas space d to be installed and the outlet pipe 22
It is divided into a liquid storage space e in which b is arranged. Further, the baffle plate 22c prevents liquid refrigerant separated into gas and liquid from directly entering the suction pipe 6a.

In the above, the inlet pipe 22a is connected to a heat exchanger (not shown) by a refrigerant gas pipe and sucks a low-pressure refrigerant gas or a gas-liquid two-phase mixed refrigerant. The gas-liquid mixed refrigerant sucked is separated by hitting the baffle plate 22c, the liquid refrigerant is stored in the liquid storage space e of the accumulator 22, and the low temperature and low pressure gas refrigerant stored in the gas space d is transferred to the compression unit. 3 is sucked into the compression chamber 11 via the suction pipe 6a and the suction port 6, and is compressed in the compression chamber 11 with the rotation of the electric motor 2 to become a high temperature and high pressure gas, which is discharged from a discharge port (not shown). A closed container that circulates in the electric motor room 2a that houses the electric motor 2
The inside of 1a 'has a high internal pressure and is discharged from the discharge pipe 14 to the outside.

However, if the internal high-pressure compressor 1'having the above-mentioned structure is used in an area where the outside temperature is extremely high, such as in the Middle East, or in an air conditioner when the capacity of the condenser is lowered due to external factors, the compressor 1 ' The high pressure of 1'may rise significantly. In this case, since there is no means for releasing (decompressing) the high pressure, there is a problem that the life and reliability of the compressor 1 ′ are reduced as the pressure rises.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a bypass pipe provided with a relief valve is provided between a high-pressure side closed container and a low-pressure side accumulator to prevent a high outside air temperature. It is an object of the present invention to provide a compressor capable of suppressing the pressure increase in the closed container even under the conditions and ensuring durability and reliability.

[0008]

In order to solve the above-mentioned problems, the present invention provides an internal high-pressure compressor in which an electric motor and a compressor are provided in a closed container, and an inlet pipe attached to the compressor. And a compressor comprising an accumulator having an outlet pipe and an outlet pipe of the accumulator connected to a suction port of the compression section, wherein the electric motor chamber and the gas space of the accumulator are opened and closed by a differential pressure. It is connected by a bypass pipe equipped with a valve.

The bypass pipe is connected between the electric motor chamber and the gas space inside the accumulator.

The bypass pipe is connected between the electric motor chamber and the inlet pipe.

Further, the bypass pipe is connected between the electric motor chamber and the outlet pipe.

Further, the mounting position of the bypass pipe connected to the electric motor chamber side is such that the bypass pipe is connected above the oil level of the lubricating oil accumulated in the closed container.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The compressor according to the present invention will be described by taking a rotary compressor as an example. FIG. 1 is a schematic sectional view of a rotary compressor, and FIG. 2 is an enlarged sectional view of an essential part showing an embodiment of the present invention. In the figure, the compressor 1 is
An electric motor 2 and a compression unit 3 driven by the electric motor 2 are arranged above and below in a closed container 1a.

The compression part 3 has a crankshaft 4 having an eccentric shaft part 5 for transmitting the rotational force of the electric motor 2 to the compression part 3, and a suction port 6 and a discharge port (not shown) on the inner surface of the cylinder. And a lower bearing 9 that is disposed at both axial ends of the cylinder 7 and that rotatably supports the crankshaft 4, and a cylinder 7 that moves along the inner surface of the cylinder to form an inner circumference. The part is constituted by an annular roller 10 rotatably fitted to the eccentric shaft part 5. 6a
Is a suction pipe communicating with the suction port 6, sucking low-pressure refrigerant from the accumulator 12, and supplying the low-pressure refrigerant to the compression unit 3. A compression chamber 11 is formed by the outer peripheral surface of the piston 10 and the inner cylindrical surface of the cylinder 7.

The thrust bearing 4a of the crankshaft 4 is brought into contact with and supported by the lower bearing 9, and the lower end of the crankshaft 4 is dipped in the lubricating oil 13 stored in the bottom surface of the hermetically sealed container 1 to make the crankshaft 4 The hollow part of the crankshaft 4 with the rotation of
The lubricating oil 13 is pumped through 4b and the pumped lubricating oil
13 is supplied to each part.

The accumulator 12 is vertically fixed to the side wall of the compressor body 1 by a fixing metal fitting a, etc., an inlet pipe 12a is attached to an inlet b at the upper end, and an outlet pipe 12b is attached to an outlet c at the lower end. The outlet pipe 12b is formed so that the upper end opening 12b1 is located slightly above the intermediate height inside the accumulator 12, and the lower end is connected to the suction pipe 6a communicating with the suction port 6 of the compression unit 3. There is. An anti-spherical screen (not shown) is attached between the inlet pipe 12a and the outlet pipe 12b together with a baffle plate 12c having a refrigerant flow hole, and the inside of the accumulator 12 is connected to the inlet pipe 12a.
Is divided into a gas space d in which is arranged and a liquid storage space e in which the outlet pipe 12b is arranged. Also, the baffle plate 12c
Prevents the liquid refrigerant separated into gas and liquid from directly entering the suction pipe 6a.

In the above, the inlet pipe 12a is connected to a heat exchanger (not shown) by a refrigerant gas pipe and sucks a low-pressure refrigerant gas or a gas-liquid two-phase mixed refrigerant. The sucked gas-liquid mixed refrigerant collides with the baffle plate 12c and is separated, the liquid refrigerant is stored in the liquid storage space e of the accumulator 12, and the low temperature and low pressure gas refrigerant stored in the gas space d is compressed by the compression unit. 3 is sucked into the compression chamber 11 via the suction pipe 6a and the suction port 6, and is compressed in the compression chamber 11 with the rotation of the electric motor 2 to become a high temperature and high pressure gas, which is discharged from a discharge port (not shown). A closed container that circulates in the electric motor room 2a that houses the electric motor 2
The inside of 1a has a high internal pressure and is discharged from the discharge pipe 14 to the outside.

The electric motor chamber 2a (high temperature and high pressure) and the gas space d (low temperature and low pressure) inside the accumulator 12 are connected by a bypass pipe 16 provided with a relief valve 15 which opens and closes by a differential pressure, and the relief valve 15 is connected. It opens when the differential pressure between the electric motor room 2a and the gas space d of the accumulator 12 is a first set value (for example, 30 to 35 kg / cm ² G) and a second set value (for example, 30 kg / cm ² G). ) It is configured to be closed at the following times.

Further, as shown in FIG. 3, the bypass pipe is
16 is connected between the electric motor chamber 2a and the low temperature low pressure inlet pipe 12a (shown by a broken line), or a branch pipe or the like is used between the electric motor chamber 2a and the low temperature low pressure outlet pipe 12b. With such a structure, the work is easy and the cost is advantageous.

Further, as shown in FIG. 2, the electric motor room 2a
The installation position of the bypass pipe 16 connected to the side is such that the bypass pipe 16 is connected above the oil surface 13a of the lubricating oil 13 accumulated in the closed container 1a. It is possible to prevent reduction, prevent performance deterioration, and maintain high quality.

In the above structure, the high pressure inside the compressor 1 rises abnormally during cooling operation at high outside temperature, and the differential pressure between the electric motor chamber 2a and the gas space d of the accumulator 12 becomes first. When the set value is reached, the relief valve 15 is opened by the operation of a built-in spring, and the high pressure gas refrigerant is bypassed from the high pressure side of the closed container 1a to the low pressure side of the accumulator 12 (the arrow direction in FIG. 2), By reducing the circulation amount of the refrigerant and exchanging heat between the high-pressure gas refrigerant and the low-pressure refrigerant, the pressure rise of the compressor 1 is protected and the performance deterioration is prevented. Further, by opening the relief valve 15, the accumulator 12
When the pressure on the side increases and the differential pressure falls below the second set value,
The relief valve 15 is closed to switch to the normal refrigerant circulation amount.

As described above, even in the cooling operation at the high outside temperature, the circulation amount of the refrigerant is reduced while the operation of the internal high pressure type compressor 1 is continued, and the high pressure gas refrigerant and the low pressure refrigerant are used. By exchanging heat, the compressor can protect the pressure rise of the compressor 1 and prevent the performance from deteriorating, thereby ensuring durability (lifetime) and reliability.

[0023]

As described above, according to the compressor of the present invention, the circulation amount of the refrigerant is reduced while the operation of the internal high pressure type compressor is continued even in the cooling operation at the high outside temperature, By exchanging heat with the high pressure gas refrigerant and the low pressure refrigerant,
The compressor can protect the pressure rise of the compressor 1 and prevent the performance from deteriorating, and can ensure durability (lifetime) and reliability.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a compressor according to the present invention.

FIG. 2 is a sectional view of an essential part showing an embodiment of a compressor according to the present invention.

FIG. 3 is a vertical sectional view of a compressor showing another embodiment according to the present invention.

FIG. 4 is a vertical sectional view of a compressor according to a conventional example.

[Explanation of symbols]

1 compressor 1a closed container 2 electric motor 2a Electric motor room 3 Compressor 4 crankshaft 5 Eccentric shaft 6 suction port 6a suction pipe 7 cylinders 8 Aperture mechanism 9 Indoor heat exchanger 10 pistons 11 compression chamber 12 Accumulator 12a inlet pipe 12b outlet pipe 12c baffle board 13 Lubricating oil 14 Discharge pipe 15 relief valve 16 bypass pipe a metal fittings b entrance c exit d gas space e Liquid storage space

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F04C 29/10 331 F04C 29/10 331C F25B 31/02 F25B 31/02 Z 41/04 41/04 H

Claims (5)

[Claims] 1. An internal high-pressure compressor in which a motor and a compressor are arranged in a closed container, an accumulator attached to the compressor and having an inlet pipe and an outlet pipe, and an outlet pipe of the accumulator. Is connected to the suction port of the compression section, wherein the electric motor chamber and the gas space of the accumulator are connected by a bypass pipe having a relief valve that opens and closes by a differential pressure. And a compressor. 2. The compressor according to claim 1, wherein the bypass pipe is connected between the electric motor chamber and a gas space inside the accumulator. 3. The compressor according to claim 1, wherein the bypass pipe is connected between the electric motor chamber and the inlet pipe. 4. The compressor according to claim 1, wherein the bypass pipe is connected between the electric motor chamber and the outlet pipe. 5. The mounting position of the bypass pipe connected to the electric motor chamber side is connected to a level higher than an oil level of the lubricating oil accumulated in the closed container. The compressor according to any one of 3 and 4.