CN108167188A - It is a kind of to determine the more rotor compressors of rotating speed change discharge capacity and its become displacement control - Google Patents

Abstract

The invention relates to a multi-rotor compressor with constant speed and variable displacement, which includes a compressor casing, at least two cylinders are arranged in the compressor casing, an exhaust port is arranged on the compressor casing, and the The gas-liquid separator is arranged outside the compressor casing, and the gas-liquid separator is provided with a suction port. All cylinders in the compressor casing are connected to the gas-liquid separator through separate connecting pipes, and at least one cylinder is connected to the gas-liquid separator. The connecting pipe between the gas-liquid separators is provided with a solenoid valve that can realize one-way conduction or closure from the gas-liquid separator to the cylinder. The cylinder unloading principle of the invention is clear and concise, the electromagnetic valve technology is mature, and the operability is stronger than the prior art scheme. The invention does not change the original structure of the compressor, does not add parts to the compressor cavity, reduces the difficulty of compressor design, and at the same time facilitates the maintenance of the solenoid valve; the invention can prevent high-pressure gas and lubricating oil from overflowing from the unloaded cylinder, ensuring that the cylinder Uninstall reliability.

Description

A fixed-speed variable-displacement multi-rotor compressor and its variable-displacement control method

technical field

The invention relates to a fixed-speed rotor compressor, in particular to a constant-speed variable-displacement multi-rotor compressor with two or more rotors and a variable-displacement control method thereof.

Background technique

The rotary compressor is a positive displacement compressor, which is mainly composed of a compressor housing, a gas-liquid separator, a cylinder, and an eccentric rotor. Relying on the rolling of the eccentric rotor in the cylinder to realize the change of the working volume of the cylinder, and to realize the suction, compression and exhaust process of the gas refrigerant. Chinese patent CN 103807174 B discloses a technology. In order to achieve greater displacement and cooling capacity, a rotary compressor can have two or more cylinders.

With the continuous upgrading of energy efficiency standards for refrigeration equipment, the compressor must not only run efficiently under full load, but also need to reduce power consumption under partial load. Refrigerant flow discharged from the compressor. However, the variable frequency compressor is expensive and has a high failure rate, and the alternative is the variable displacement operation of the fixed frequency compressor.

At present, there are two types of variable displacement technologies for fixed-speed rotor compressors: 1. Electromagnets are used to separate the eccentric rotor from the cylinder wall, thereby realizing cylinder unloading and reducing displacement. Chinese patent CN 103244412 B discloses this technology; 2. .First guide the high-pressure discharge of the compressor to the suction port of the cylinder that needs to be unloaded, and then drive the special blade structure inside the compressor through the change of pressure difference to separate the eccentric rotor from the wall of the cylinder, thereby reducing the displacement. Chinese patent CN 100564881C And Chinese patent CN 1761817 B all discloses this technology.

Although the above two technologies can realize cylinder unloading and change the refrigerant discharge flow rate, the former is prone to refrigerant leakage when the two cylinders are running, and the latter requires a complex pipeline. Therefore, it is hoped that the above functions can be realized through more concise and reliable measures.

Contents of the invention

The purpose of the present invention is to provide a fixed-speed variable-displacement multi-rotor compressor and its variable-displacement control method in order to improve the variable-displacement technology of the fixed-speed rotary compressor. A one-way solenoid valve is set on the pipeline between them to cut off the low-pressure air source of the unloaded cylinder, and at the same time prevent the high-pressure gas and lubricating oil from overflowing from the unloaded cylinder, ensuring the reliability of cylinder unloading.

The purpose of the present invention can be achieved through the following technical solutions:

A multi-rotor compressor with fixed speed and variable displacement, including a compressor casing, a fixed speed motor, a bearing, and an oil pool are installed in the compressor casing, and it is characterized in that at least Two cylinders, the compressor casing is provided with an exhaust port, the gas-liquid separator is arranged outside the compressor casing, the gas-liquid separator is provided with a suction port, and the All the cylinders are connected to the gas-liquid separator through separate connecting pipes, and the connecting pipe between at least one cylinder and the gas-liquid separator is provided with a solenoid valve that can realize one-way conduction or closing from the gas-liquid separator to the cylinder.

An eccentric rotor is installed in the cylinder.

For the solenoid valve, the control of the conduction or closure of the valve body can be realized by controlling the power on and off of the coil.

In the following technical solutions and embodiments, a dual-rotor compressor is taken as an example for illustration. However, the number of rotors in a rotary compressor is not limited. The structure of installing a solenoid valve on the connecting pipe between any cylinder and the gas-liquid separator, and the unloading cylinder by controlling the on-off of the solenoid valve are all within the scope of protection of this patent.

The invention provides the first double-rotor compressor with constant speed and variable displacement.

The fixed-speed variable-displacement double-rotor compressor includes a compressor casing, an upper cylinder and a lower cylinder are arranged inside the compressor casing, an exhaust port is arranged on the compressor casing, and the gas-liquid separation The gas-liquid separator is provided outside the compressor casing, the gas-liquid separator is provided with a suction port, the upper cylinder and the lower cylinder are connected to the gas-liquid separator through a separate connecting pipe, and the connection between the upper cylinder and the gas-liquid separator The connecting pipe between the upper cylinder and the gas-liquid separator is provided with a solenoid valve of the upper cylinder, and the connecting pipe between the lower cylinder and the gas-liquid separator is provided with a solenoid valve of the lower cylinder. The control that the device is turned on or off in one direction to the cylinder.

The volumes of the upper cylinder and the lower cylinder are different. It is also possible to set the volume of the upper cylinder and the lower cylinder to be the same.

The exhaust port is located at the top of the compressor casing, and the air suction port is located at the top of the gas-liquid separator.

The variable displacement control method of the fixed-speed variable-displacement double-rotor compressor realizes the change of the third-stage displacement by controlling the on-off of the solenoid valve of the upper cylinder and the solenoid valve of the lower cylinder. When the solenoid valve of the upper cylinder and the solenoid valve of the lower cylinder are simultaneously When it is turned on, the displacement of the compressor is the largest, which is the sum of the displacements of the upper cylinder and the lower cylinder; when the solenoid valve of the upper cylinder is turned on and the solenoid valve of the lower cylinder is closed, the displacement of the compressor is the displacement of the upper cylinder; When the solenoid valve of the upper cylinder is closed and the solenoid valve of the lower cylinder is turned on, the displacement of the compressor is the displacement of the lower cylinder.

The present invention provides the second fixed-speed variable-displacement dual-rotor compressor,

The fixed-speed variable-displacement double-rotor compressor includes a compressor casing, an upper cylinder and a lower cylinder are arranged inside the compressor casing, an exhaust port is arranged on the compressor casing, and the gas-liquid separation The gas-liquid separator is arranged outside the compressor casing, and the gas-liquid separator is provided with a suction port. Both the upper cylinder and the lower cylinder are connected to the gas-liquid separator through a separate connecting pipe, and only the upper cylinder is separated from the gas-liquid. The upper cylinder electromagnetic valve is set on the connecting pipe between the devices, or the lower cylinder electromagnetic valve is only set on the connecting pipe between the lower cylinder and the gas-liquid separator, and the upper cylinder electromagnetic valve or the lower cylinder electromagnetic valve can realize from The gas-liquid separator is turned on or off in one direction to the cylinder.

The volumes of the upper cylinder and the lower cylinder may be the same or different.

The exhaust port is located at the top of the compressor casing, and the air suction port is located at the top of the gas-liquid separator.

The variable displacement control method of the constant speed and variable displacement dual-rotor compressor realizes the change of two-stage displacement by controlling the on-off of the solenoid valve. When the solenoid valve is turned on, the displacement of the compressor is equal to that of the upper cylinder and the lower cylinder. The sum of displacement; when the solenoid valve is closed, the displacement of the compressor is the displacement of the cylinder that is not connected to the solenoid valve.

The gas-liquid separator described in the present invention is also referred to as a muffler in some documents.

Compared with the prior art, the present invention has the following advantages:

1. The principle of cylinder unloading is clear and concise, and the solenoid valve technology is mature, which is more operable than the existing technical solutions.

2. The original structure of the compressor is not changed, and no components are added to the compressor cavity, which reduces the difficulty of compressor design and facilitates the maintenance of the solenoid valve;

3. It can avoid the overflow of high-pressure gas and lubricating oil from the unloaded cylinder, ensuring the reliability of cylinder unloading.

Description of drawings

Fig. 1 is a structural schematic diagram of a double-rotor compressor with fixed speed and variable displacement (variable displacement in third gear).

Fig. 2 is a structural schematic diagram of a fixed-speed variable-displacement dual-rotor compressor (two-speed variable displacement).

In the figure, 1 is the compressor casing, 2 is the upper cylinder, 3 is the lower cylinder, 4 is the exhaust port, 5 is the suction port, 6 is the gas-liquid separator, 8 is the solenoid valve of the upper cylinder, and 11 is the lower cylinder Solenoid valve, 7,9,10,12 are connecting pipes.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

A double-rotor compressor with fixed speed and variable displacement, with variable displacement in the third gear. The main structure is shown in Figure 1, including a compressor casing 1, an upper cylinder 2, a lower cylinder 3, an exhaust port 4, and a suction port 5. Gas-liquid separator 6, upper cylinder solenoid valve 8, lower cylinder solenoid valve 11, connecting pipes 7, 9, 10, 12.

A constant speed motor, a bearing, an oil pool, an upper cylinder 2 and a lower cylinder 3 are installed in the compressor casing 1 . The upper cylinder 2 and the lower cylinder 3 are respectively equipped with eccentric rotors, and communicate with the gas-liquid separator 6 through connecting pipes respectively. The connecting pipes are respectively provided with an upper cylinder solenoid valve 8 and a lower cylinder solenoid valve 11 . That is, the upper cylinder 2 is connected to the gas-liquid separator 6 outlet through the connecting pipe 9, the upper cylinder electromagnetic valve 8, and the connecting pipe 7, and the lower cylinder 3 is connected to the gas-liquid separator through the connecting pipe 12, the lower cylinder electromagnetic valve 11, and the connecting pipe 10. The outlet of the device 6, and the inlet of the gas-liquid separator 6 is the suction port 5.

But the internal volumes of the upper cylinder 2 and the lower cylinder 3 are different. The exhaust port 4 is located at the top of the compressor casing 1 , and the air suction port 5 is located at the top of the gas-liquid separator 6 .

The compressor realizes the variation of the third gear displacement by controlling the on-off of the upper cylinder solenoid valve 8 and the lower cylinder solenoid valve 11 . When the solenoid valve 8 of the upper cylinder and the solenoid valve 11 of the lower cylinder are opened at the same time, the displacement of the compressor is the largest, which is the sum of the displacements of the upper cylinder 2 and the lower cylinder 3; when the solenoid valve 8 of the upper cylinder is opened and the solenoid valve of the lower cylinder is When 11 is closed, the displacement of the compressor is the displacement of the upper cylinder 2; when the solenoid valve 8 of the upper cylinder is closed and the solenoid valve 11 of the lower cylinder is opened, the displacement of the compressor is the displacement of the lower cylinder 3.

Example 2

A fixed-speed variable-displacement dual-rotor compressor with variable displacement in two gears. The main structure is shown in Figure 2. Compared with Embodiment 1, the upper cylinder 2 and the lower cylinder 3 of Embodiment 2 can be the same two cylinders or cylinders with different displacements, and the solenoid valve 8 of the upper cylinder has been cancelled.

The compressor realizes the change of two-stage displacement by controlling the on-off of the solenoid valve 11 of the lower cylinder. When the solenoid valve 11 of the lower cylinder is opened, the displacement of the compressor is the sum of the displacements of the upper cylinder 2 and the lower cylinder 3; when the solenoid valve 11 of the lower cylinder is closed, the displacement of the compressor is the displacement of the upper cylinder 2.

The above descriptions of the embodiments are for those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative efforts. Therefore, the present invention is not limited to the above-mentioned embodiments. Improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims (10)

1. a kind of determine the rotating speed change more rotor compressors of discharge capacity, including compressor case, constant speed is installed in the compressor case Motor, bearing, oil sump, which is characterized in that at least two cylinders are equipped in the compressor case, on the compressor case Equipped with exhaust outlet, the gas-liquid separator is located at outside compressor case, and the gas-liquid separator is equipped with air entry, compressor machine All cylinders in shell are connect by individual connecting tube with gas-liquid separator, between at least one cylinder and gas-liquid separator Connecting tube be equipped with can be achieved from gas-liquid separator toward the solenoid valve of cylinder one direction on and off.

A kind of determine rotating speed 2. according to claim 1 and become the more rotor compressors of discharge capacity, which is characterized in that pacify in the cylinder Equipped with eccentric rotor.

3. it is according to claim 1 it is a kind of determine rotating speed become the more rotor compressors of discharge capacity, which is characterized in that it is described determine rotating speed become The more rotor compressors of discharge capacity become discharge capacity two-spool compressor to determine rotating speed,

It is described to determine rotating speed and become discharge capacity two-spool compressor to include compressor case, upper cylinder is equipped in the compressor case under Cylinder, the compressor case are equipped with exhaust outlet, and the gas-liquid separator is located at outside compressor case, the gas-liquid separator Air entry is equipped with, the upper cylinder is connect with lower cylinder by individual connecting tube with gas-liquid separator, upper cylinder and gas Connecting tube between liquid/gas separator is equipped with upper cylinder solenoid valve, and the connecting tube between lower cylinder and gas-liquid separator is equipped with down Cylinder solenoid valve, the upper cylinder solenoid valve and lower cylinder solenoid valve can be achieved to be connected from gas-liquid separator toward cylinder one direction Or the control closed.

4. it is according to claim 3 it is a kind of determine rotating speed become the more rotor compressors of discharge capacity, which is characterized in that the upper cylinder and Lower cylinder volume is different.

5. it is according to claim 1 it is a kind of determine rotating speed become the more rotor compressors of discharge capacity, which is characterized in that it is described determine rotating speed become The more rotor compressors of discharge capacity become discharge capacity two-spool compressor to determine rotating speed,

It is described to determine rotating speed and become discharge capacity two-spool compressor to include compressor case, upper cylinder is equipped in the compressor case under Cylinder, the compressor case are equipped with exhaust outlet, and the gas-liquid separator is located at outside compressor case, the gas-liquid separator Air entry is equipped with, the upper cylinder is connect with lower cylinder by individual connecting tube with gas-liquid separator, only in upper cylinder Upper cylinder solenoid valve or, the only company between lower cylinder and gas-liquid separator are set in the connecting tube between gas-liquid separator Take over setting lower cylinder solenoid valve, the upper cylinder solenoid valve or lower cylinder solenoid valve can be achieved from gas-liquid separator toward gas The control of cylinder one direction on and off.

6. it is according to claim 5 it is a kind of determine rotating speed become the more rotor compressors of discharge capacity, which is characterized in that the upper cylinder and Lower cylinder volume can be identical or differs.

7. a kind of according to claim 1,2,3 or 5, which determines rotating speed, becomes the more rotor compressors of discharge capacity, which is characterized in that described Exhaust outlet is located at the top of compressor case, and the air entry is located at the top of gas-liquid separator.

8. a kind of according to claim 3 or 5, which determines rotating speed, becomes the more rotor compressors of discharge capacity, which is characterized in that the upper gas Eccentric rotor is mounted in cylinder and lower cylinder.

9. the change displacement control that rotating speed becomes the more rotor compressors of discharge capacity is determined as claimed in claim 3, which is characterized in that pass through The break-make of upper cylinder solenoid valve and lower cylinder solenoid valve is controlled to realize the variation of third gear capacity, when upper cylinder solenoid valve and lower gas When cylinder solenoid valve simultaneously turns on, compressor air-discharging amount is maximum, is the sum of the capacity of upper cylinder and lower cylinder；When upper cylinder electromagnetism When valve is connected and lower cylinder solenoid valve is closed, compressor air-discharging amount is upper cylinder capacity；When upper cylinder solenoid valve close and under When cylinder solenoid valve is connected, compressor air-discharging amount is lower cylinder capacity.

10. the change displacement control that rotating speed becomes the more rotor compressors of discharge capacity is determined as claimed in claim 5, which is characterized in that logical The break-make for crossing control solenoid valve realizes the variation of two grades of capacities, when solenoid valve conduction, compressor air-discharging amount for upper cylinder and The sum of capacity of lower cylinder；When solenoid valve is closed, compressor air-discharging amount is the capacity without connecting the cylinder of solenoid valve.