JPH0658273A - Horizontal scroll compressor - Google Patents

Abstract

PURPOSE:To inject no oil into a compressor element at the time of a high circulating quantity of gas fluid, but inject oil only at the time of a low circulating quantity. CONSTITUTION:This scroll compressor is constituted so that oil is not injected into a compressor element at the time a high circulating quantity of gas fluid, but oil is injected only at the time a low circulating quantity, by providing an oil sump 9 on the lower part of a low pressure side chamber 7 opening to a low pressure pipe 6, an oil injection passage 15 between the sump and the suction chamber A2 of the compressor element A, and an opening/closing valve 18 to open the oil injection passage 15 at the time of a low circulating quantity of gas and close it at the time of a high circulating quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor in which oil is injected into a compression element to improve the sealing property.

[0002]

2. Description of the Related Art Conventionally, a scroll compressor in which oil is injected into a compression element is disclosed in JP-A-3-217.
It is disclosed in Japanese Patent No. 680. As shown in FIG. 4, this conventional scroll compressor includes a first scroll B having an end plate B1 and a scroll B2, and a second scroll C having an end plate C1 and a scroll C2 facing the end plate B1. Of the first scroll B, the scrolls B and C are overlapped with each other so that the scroll end portions of the spiral bodies B2 and C2 are meshed with each other at a position where the end portions of the winding ends are displaced by about 180 °. A discharge port E is provided on the center side of the end plate B1 and a suction chamber F is provided on the outer peripheral side, and the swirling motion of the second scroll C with respect to the first scroll B causes the scrolls B2, C2 to be rotated.
A two-system working space formed therebetween is moved in the direction of the discharge port E provided at the center while reducing the volume to perform a compression action, while a drive shaft G for driving the second scroll C. An oil pump J for feeding lubricating oil to an oil supply passage I formed in the shaft center portion of the drive shaft G is provided at the end portion on the side opposite to the scroll, and an oil injection port K is provided in the first scroll B. The oil injection port K is communicated with the oil supply passage I through the oil injection passage T, and the oil pump J is connected to the compression element D.
During operation, oil is always injected, and the working space is sealed by this oil to enhance the airtightness of the working space.

By the way, injecting oil into the compression element at all times in this way is a case in which a model equipped with a variable speed motor rotates at a high speed, or when a low pressure is high, a high gas circulation amount. Since the amount of oil supplied together with the gas into the compression element D also increases at times, it is not necessary to inject oil into the compression element D at this high circulation rate, but with a model equipped with a variable speed motor. The amount of oil supplied to the compression element D decreases when the gas circulation rate is low, such as when the engine rotates at a low speed or when the low pressure is low. This causes an oil shortage, which causes the above-mentioned operation. The airtightness of the space is deteriorated, the capacity is lowered, and leakage to the low pressure side occurs in the working space, the leaked gas is compressed again, and the discharge gas temperature rises. ,Previous It is by problems problems such as seizure of the spiral body is generated occurs.

[0004]

However, according to the conventional scroll compressor, in the compression element D, not only when the gas circulation amount is low, but the oil is originally supplied into the compression element D. Since oil is always injected even at the time of a large high circulation amount, at the time of this high circulation amount, there is a problem that oil rises to the high pressure pipe communicating with the discharge port, and to solve this problem, There is another problem that requires a demister between the discharge port and the high pressure pipe.

The present invention has been made in view of the above points.
The purpose is to make it possible to inject oil only when the circulation amount is low, without injecting oil when the circulation amount is high.

[0006]

However, according to the present invention,
The horizontal casing 1 has the first scroll 2 and the second scroll 3, and the relative orbiting motion of the first and second scrolls 2 and 3 creates a working space in the direction of the discharge port A1 provided in the central portion. The compression element A, which is configured to move while decreasing the pressure, performs a compression action, the high pressure side chamber 5 in which the high pressure pipe 4 is opened on one side of the compression element A, and the low pressure pipe 6 is opened on the other side. A horizontal scroll compressor which defines a low-pressure side chamber 7 and has an oil sump 9 provided at a lower portion of the low-pressure side chamber 7, wherein oil injection is performed between the oil sump 9 and the suction chamber A2 of the compression element A. The passage 15 is provided, and the opening / closing means is provided to open the oil injection passage 15 when the gas circulation amount is low and to close the oil injection passage 15 when the gas circulation amount is high.

Further, a temperature detection sensor 16 for detecting the temperature of the discharge gas discharged from the compression element A is provided, and the oil injection passage 15 is opened when the temperature of the discharge gas becomes higher than a predetermined temperature, and is set to a predetermined value. An on-off valve 18 that closes when the temperature becomes lower than the temperature may be provided.

A variable speed motor 11 is provided in the low pressure side chamber 7 to drive the drive shaft 10 by changing the rotation speed by frequency conversion.
The oil injection passage 15 may be provided with an on-off valve 18 that opens when the rotation speed of the motor 11 is below a predetermined rotation speed and closes when the rotation speed of the motor 11 exceeds the predetermined rotation speed.

Further, it is composed of a valve body 29a for opening and closing the oil injection passage 15 and a valve spring 29b for urging the valve body 29a in the opening direction, and the pressure difference between the low pressure side chamber 7 and the suction chamber A2 is not less than a predetermined value. When it becomes extremely small, the valve spring 29b
Therefore, a differential pressure valve 29 for opening the valve body 29a may be provided.

[0010]

Since the oil injection passage 15 is provided between the oil sump 9 provided in the lower portion of the low pressure side chamber 7 where the low pressure pipe 6 opens and the suction chamber A2 of the compression element A, when the scroll orbits, The oil in the oil sump 9 can be sucked into the suction chamber A2 from the oil injection passage 15 by the suction action of the gas sucked into the suction chamber A2. Therefore, the structure of the oil injection passage 15 can be simplified as compared with the case where oil is injected into the compression element using the oil pump, and the cost can be reduced accordingly.

Further, since the oil injection passage 15 is opened when the gas circulation amount is low and the opening / closing means is closed when the gas circulation amount is high, the suction chamber A2 is opened in the oil sump 9. In addition, the oil can be injected into the compression element A only when the gas circulation amount is low, and therefore, the oil shortage in the compression element A can be eliminated, the airtightness of the working space can be secured, and the capacity can be improved, and Since oil is not injected when the gas fluid has a high circulation rate, the amount of oil flowing into the high pressure pipe is small.

Further, a temperature detecting sensor 16 for detecting the temperature of the discharge gas discharged from the compression element A is provided, and the oil injection passage 15 is opened when the temperature of the discharge gas becomes higher than a predetermined temperature, and a predetermined temperature is reached. When the on-off valve 18 that closes when the temperature becomes lower is provided, when the model equipped with the variable speed motor is rotated at a low speed to have a low circulation amount, or the low pressure decreases due to the operating condition to have a low circulation amount. For example, when oil injection is required,
It is possible to inject into the compression element A.

Further, a variable speed motor 11 for driving the drive shaft 10 is installed in the low pressure side chamber 7 to change the rotation speed by frequency conversion, and the motor 11 is provided in the oil injection passage 15.
When an on-off valve 18 that opens when the number of revolutions is less than a predetermined number of revolutions and closes when the number of revolutions exceeds a predetermined number of revolutions can be obtained by controlling the number of revolutions signal from the controller of the variable speed motor 11, The structure can be simplified as compared with the case where the detection sensor 16 is used, and the cost can be reduced accordingly.

Further, it is composed of a valve body 29a for opening and closing the oil injection passage 15 and a valve spring 29b for urging the valve body 29a in the opening direction, and the pressure difference between the low pressure side chamber 7 and the suction chamber A2 is not less than a predetermined value. When it becomes extremely small, the valve spring 29b
Therefore, when the differential pressure valve 29 for opening the valve body 29a is provided, it is not necessary to detect the rotation speed of the motor 11 or the discharge gas temperature, so that the cost can be further reduced. .

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The scroll compressor shown in FIG. 1 mainly compresses a refrigerant in a refrigerating machine, and a first end plate 2a is provided inside a cylindrical closed horizontal casing 1 on one side in the length direction.
And a first scroll 2 having a first spiral body 2b protruding outward from one side of the first end plate 2a, and the first end plate 2a.
And a second scroll 3 having a second end plate 3a facing each other and a second spiral body 3b protruding outward from one side of the second end plate 3a. Are overlapped with each other so that the end-of-winding ends of the spiral bodies 2b and 3b are displaced from each other by approximately 180 °, and the discharge port A1 is provided on the center side of the end plate 2a of the first scroll 2.
In addition, a suction chamber A2 is provided on the outer peripheral side, and a two-system working space formed between the spiral bodies 2b, 3b by the orbiting motion of the second scroll 3 with respect to the first scroll 2 is provided in the central portion. The volume is decreased in the direction of the discharge port A1 to perform the compression action.

In the casing 1, a high pressure side chamber 5 in which the high pressure pipe 4 is opened on one side of the compression element A and a low pressure side chamber 7 in which the low pressure pipe 6 is opened on the other side are defined by a partition wall 8. An oil sump 9 is provided in the lower portion of the low pressure side chamber 7, and a motor 11 having a drive shaft 10 for rotating the second scroll 3 is installed in the low pressure side chamber 7, and further on the back surface of the second scroll 3. A housing 12 having a bearing 12a is internally mounted, and the bearing 12a of the housing 12 is
While supporting the scroll side of the drive shaft 10 with respect to the motor, the oil supply passage 13 formed at the shaft center of the drive shaft 10 is supplied with lubricating oil at the end opposite to the scroll shaft of the drive shaft 10 with respect to the motor. An oil pump 14 for sending is provided. A gas passage 12b is provided in the upper part of the housing 12 for communicating the upper part of the low pressure side chamber 7 with the suction chamber A2, and a tip seal is provided at the tip of each of the spiral bodies 2b, 3b. There is.

The first embodiment shown in FIG. 1 is the compressor constructed as described above, and the housing 12
Is provided with an oil injection passage 15 opening to the oil sump 9 and the suction chamber A2 of the compression element A, and
The high pressure pipe 4 is provided with a temperature detection sensor 16 for detecting the temperature of the discharge gas flowing through the high pressure pipe 4, and a seat portion 17a is provided in the middle of the oil injection passage 15.
Is provided with a valve chamber 17, and a spool-type on-off valve 18 that opens when the temperature of the discharge gas becomes higher than a predetermined temperature and closes when the temperature of the discharge gas becomes lower than the predetermined temperature. A valve spring 19 for constantly urging the opening / closing valve, an electromagnetic switching valve 20 for controlling the opening / closing of the opening / closing valve 18, and a detection signal output from the temperature detection sensor 16 on the back side of the opening / closing valve 18. And a controller 21 that outputs an operation signal based on the above, and operates the electromagnetic switching valve 20 by the operation signal output from the controller 21.
The on-off valve 18 is operated.

The temperature detecting sensor 16 is, for example, a sensor which constantly detects the discharge gas temperature, converts the detected temperature value into an electric signal and outputs the electric signal, and the sensor 16 is connected to the input section of the controller 21. In addition, the controller 21 includes an arithmetic processing unit (CPU) and a memory (RAM), and an input unit (not shown) is provided in an input unit of the controller 21, and the input unit controls the predetermined amount of the discharge gas. The temperature is decided beforehand. Then, the detection signal value of the temperature detection sensor 16 corresponding to the predetermined temperature of the discharge gas is set by the setting means provided in the arithmetic processing unit (CPU), and the set signal value thus set is stored in the memory (RAM). Then, when the compression element A is driven, the detection signal from the temperature detection sensor 16 is calculated, the setting signal value is read from the memory (RAM), and the detection signal value and the setting signal value are calculated. The control unit outputs the control signal from the output unit of the controller 21 to the solenoid of the electromagnetic switching valve 20 when the set signal value is reached. The sensor 16 is a sensor that constantly detects the discharge gas temperature, and also a sensor that outputs a temperature signal when the discharge gas temperature rises to a predetermined temperature (for example, 130 ° C.). May be used.

The switching valve 20 is provided in the high pressure side chamber 5
A three-port switching valve having a high pressure port communicating with the low pressure side chamber 7, a low pressure port communicating with the low pressure side chamber 7, and a control port communicating with the valve chamber 17, the solenoid of which is connected to the output section of the controller 21, Until the operation signal is output from the controller 21, the high pressure position H is switched to change the high pressure gas pressure in the high pressure side chamber 5 to the on-off valve 1.
8 to close the oil injection passage 15, and when an operation signal is output from the controller 21, the low-pressure position L is switched to the low-pressure gas pressure in the low-pressure side chamber 7 by the on-off valve 18. By acting on the back surface, the opening / closing valve 18 is opened by the difference between the back pressure of the opening / closing valve 18 and the force of the valve spring 19 to open the oil injection passage 15.

The oil injection passage 15 is also provided.
Is opened near the oil surface of the oil sump 9 during operation, and when the second scroll 3 orbits, the oil in the oil sump 9 is sucked by the suction action of the gas sucked into the suction chamber A2. The oil is allowed to be sucked into the suction chamber A2 from the oil injection passage 15, and is opened slightly above the oil surface as shown in FIG. Good.

In FIG. 1, 22 is an Oldham coupling which is provided between the housing 12 and the back surface of the second scroll 3 to prevent the second scroll 3 from rotating and to make a swivel motion, and 23 is the drive shaft. 10 is a bearing housing that supports the end portion on the side opposite to the scroll with respect to the motor 10.

Next, the operation of the first embodiment constructed as above will be described.

In this embodiment, when the drive shaft 10 is driven by the motor 11, the second scroll 3 orbits, and the gas sucked from the low pressure pipe 6 into the low pressure side chamber 7 passes through the gas passage 12b. From the suction chamber A2 between the first scroll 2 and the second scroll 3, the suction space A2 is sucked into the working space formed between the scrolls 2 and 3, and is compressed by the orbiting motion of the second scroll 3. Check valve 24 provided on the discharge port A1 of the scroll 2 and the partition wall 8
It is discharged to the high-pressure side chamber 5 via the above, and is discharged to the outside via the above-mentioned high pressure pipe 4.

However, when the gas circulation rate is high, the oil supplied to the compression element A is generally large, and the temperature of the discharge gas discharged from the high pressure pipe 4 to the outside is a predetermined temperature (for example, 130 ° C.).
C) Since the temperature does not rise above the above, an operation signal is not output from the controller 21 based on the signal output from the temperature detection sensor 16. Therefore, the electromagnetic switching valve 20 is switched to the high pressure position H, and The gas pressure of the high-pressure side chamber 5 acts on the back surface of the on-off valve 18, and the on-off valve 18 closes the oil injection passage 15. Therefore, the oil in the oil sump 9 is transferred to the oil injection passage 1
Since oil is not injected into the suction chamber A2 from 5, the amount of oil rising to the high pressure pipe 4 is small.

In addition, the compression element A is used when the gas fluid has a low circulation rate.
When the discharge gas temperature becomes higher than a predetermined temperature, for example, 130 ° C or higher due to lack of oil in the temperature detection sensor 16
An operation signal is output from the controller 21 based on the detection signal output from the electromagnetic switch valve 20, which switches the electromagnetic switching valve 20 to the low pressure position L as shown in FIG. 1, and the low pressure gas pressure in the low pressure side chamber 7 is opened and closed. The on-off valve 18 acts on the back surface of the valve 18, and the difference between the back pressure of the on-off valve 18 and the force of the valve spring 19 causes the on-off valve 18 to open so that the oil injection passage 15 is opened. Therefore, oil can be injected into the compression element A through the oil injection passage 15, so that the oil shortage in the compression element A can be eliminated, the airtightness of the working space can be secured, and the capacity can be improved, The discharge gas temperature can be lowered below a predetermined temperature.

In the first embodiment, the spool type valve is used as the opening / closing valve 18 for opening / closing the oil injection passage 15. However, a needle type valve may be used instead, or an electromagnetic type valve may be used. However, the structure of the opening / closing means for opening / closing the oil injection passage 15 is not particularly limited.

Next, the second embodiment shown in FIG. 2 will be described.

In the second embodiment, a variable speed motor whose frequency is variable by frequency conversion is used as the motor 11, and a rotational speed signal is taken out from a speed controller 25 of the motor 11 and based on the rotational speed signal. The controller 2
1 outputs an actuation signal, and the actuation signal actuates the electromagnetic switching valve 20 to actuate the on-off valve 18. The basic structure is the same as that shown in FIG. The same reference numerals are used for the parts, and the description thereof will be omitted.

Further, in the case of this embodiment, the predetermined number of rotations of the motor 11 is predetermined by the input device provided in the input section of the controller 21. Then, the rotation speed signal of the speed controller 25 corresponding to the predetermined rotation speed is set by the setting means provided in the arithmetic processing unit (CPU) of the controller 21, and the set signal value thus set is stored in the memory (RAM). When driving the compression element A, the rotation speed signal from the speed controller 25 is calculated, the setting signal value is read from the memory (RAM), and the rotation speed signal value and the setting signal value are stored. Are compared by the arithmetic processing unit (CPU), and when the value is equal to or lower than the set signal value, that is, when the rotation speed of the motor 11 is equal to or lower than a predetermined rotation speed,
From the output part of the controller 21 to the electromagnetic switching valve 20
A control signal is output to the solenoid of the solenoid, the electromagnetic switching valve 20 is switched to the low pressure position L, and the opening / closing valve 18 is opened due to the difference between the back pressure of the opening / closing valve 18 and the force of the valve spring 19 to cause the oil injection passage. 15 is released, and when the rotation speed signal value exceeds the setting signal value,
That is, when the rotation speed of the motor 11 exceeds a predetermined rotation speed,
The operation signal is not output from the controller 21, so that the electromagnetic switching valve 20 is switched to the high pressure position H and the opening / closing valve 18 closes the oil injection passage 15.

In the case of the second embodiment, even if the temperature detecting sensor 16 is not provided as in the case of the first embodiment, the rotation speed signal is taken out from the speed controller 25 to remove the oil at a high gas circulation amount. It is possible to inject oil only at a low circulation amount without performing injection, and since the temperature detection sensor 16 can be eliminated,
Compared to the first embodiment, the number of parts can be reduced, the structure can be simplified, and the cost can be reduced.

Next, the third embodiment shown in FIG. 3 will be described.

In this third embodiment, the housing 12
A seat surface 26 is provided in the opening of the oil injection passage 15 to the low-pressure side chamber 7, and an annular recess 27 is provided on the outer periphery of the seat surface 26.
A disc-shaped valve element 29a that is seated on the seat surface 26 to close the oil injection passage 15 and is supported by the annular recess 27 while the spring receiver 28 is provided at a predetermined interval to oppose the spring receiver 28. And a low pressure side chamber 7 and a suction chamber A.
When the pressure difference between the valve spring 2 and the valve 2 becomes smaller than a predetermined value, the valve spring 2
Since the differential pressure valve 29 for opening the valve element 29a by 9b is provided and the basic structure is the same as that shown in FIG. 1, the common parts are denoted by the same reference numerals, and the description thereof will be omitted.

In the case of this embodiment, the valve spring 29b is
When the differential pressure becomes smaller than a predetermined value, a spring constant having a spring constant for opening the valve body 29a by overcoming the pressing force acting on the valve body 29a from the low pressure side chamber 7,
The oil injection passage 15 is closed by the pressing force acting on the valve body 29a from the low pressure side chamber 7 until the differential pressure becomes smaller than a predetermined value.

The differential pressure ΔP is

[0035]

[Equation 1]

It becomes However, g is gravitational acceleration (constant),
v is the gas flow rate, and γ is the gas density.

Therefore, when the motor 11 rotates at a low speed, the flow velocity v of the gas sucked into the low pressure side chamber 7 becomes slow, the gas circulation amount becomes low, and the differential pressure ΔP becomes small.
When the pressure difference ΔP becomes smaller than a predetermined value, the valve element 29a is opened by the valve spring 29b. Further, in the R22 refrigerant, the gas density γ when the low-pressure gas pressure is 7 kg / cm ² at a high gas circulation rate is generally
In contrast to 0.033 g / cm ³ , the gas density γ is 0.0108 g / cm ² when the low-pressure gas pressure is 1.5 Kg / cm ² when the gas circulation rate is low. When the circulation amount is low, the gas density γ decreases, and the decrease of the gas density γ decreases the pressure difference ΔP.
Is smaller than a predetermined value, the valve spring 29b causes the valve element 29a to open. When the motor 11 rotates at a high speed, the flow velocity v of the gas sucked into the low pressure side chamber 7 is high, the gas circulation amount is high, and the differential pressure Δ
Since P becomes large, the low pressure side chamber 7 to the valve body 29
The oil injection passage 15 is closed by the pressing force acting on a. Further, as described above, since the gas density γ increases when the gas circulation rate is high, the differential pressure ΔP increases due to the increase of the gas density γ, so that the pushing force acting on the valve body 29a from the low pressure side chamber 7 is increased. The oil injection passage 15 is closed by the pressure.

As described above, according to the third embodiment, it is not necessary to detect the rotation speed of the motor 11 or the discharge gas temperature, and the oil sump is stored by the differential pressure between the low pressure side chamber 7 and the suction chamber A2. Since the oil of No. 9 can be injected into the leg element A, the cost can be further reduced.

In the above embodiment, the first scroll 1
The compressor in which the second scroll 2 is fixed and the second scroll 2 is rotated with respect to the first scroll 1 has been described.
In addition, a compressor in which the first and second scrolls 1 and 2 are rotatable about their respective axes may be used.

[0040]

As described above, according to the present invention, the low pressure pipe 6
The oil injection passage 1 is provided between the oil sump 9 provided in the lower portion of the low pressure side chamber 7 where the opening is formed and the suction chamber A2 of the compression element A.
Since 5 is provided, when the scroll orbits,
The oil in the oil sump 9 can be sucked into the suction chamber A2 from the oil injection passage 15 by the suction action of the gas sucked into the suction chamber A2.
Compared with the case where oil is injected into the compression element using an oil pump, the structure of the oil injection passage 15 can be simplified and the cost can be reduced accordingly.

Moreover, since the oil injection passage 15 is opened when the gas circulation amount is low and the opening / closing means is closed when the gas circulation amount is high, the suction chamber A2 is opened in the oil sump 9. In addition, the oil can be injected into the compression element A only when the gas circulation amount is low, and therefore, the oil shortage in the compression element A can be eliminated, the airtightness of the working space can be secured, and the capacity can be improved, and Since the oil is not injected when the gas fluid has a high circulation rate, the amount of oil flowing into the high pressure pipe can be reduced.

Further, a temperature detecting sensor 16 for detecting the temperature of the discharge gas discharged from the compression element A is provided, and the oil injection passage 15 is opened when the temperature of the discharge gas becomes higher than a predetermined temperature, and is set to a predetermined temperature. When the on-off valve 18 that closes when the temperature becomes lower is provided, when the model equipped with the variable speed motor is rotated at a low speed to have a low circulation amount, or the low pressure decreases due to the operating condition to have a low circulation amount. For example, when oil injection is required,
It is possible to inject into the compression element A.

Further, the low pressure side chamber 7 is provided with a variable speed motor 11 for changing the rotation speed by frequency conversion and driving the drive shaft 10, and the motor 11 is provided in the oil injection passage 15.
When an on-off valve 18 that opens when the number of revolutions is less than a predetermined number of revolutions and closes when the number of revolutions exceeds a predetermined number of revolutions can be obtained by controlling the number of revolutions signal from the controller of the variable speed motor 11, The structure can be simplified as compared with the case where the detection sensor 16 is used, and the cost can be reduced accordingly.

Further, a valve body 29a for opening and closing the oil injection passage 15 and a valve spring 29b for urging the valve body 29a in the opening direction are provided, and the differential pressure between the low pressure side chamber 7 and the suction chamber A2 is not less than a predetermined value. When it becomes extremely small, the valve spring 29b
Therefore, when the differential pressure valve 29 for opening the valve body 29a is provided, it is not necessary to detect the rotation speed of the motor 11 or the discharge gas temperature, so that the cost can be further reduced. .

[Brief description of drawings]

FIG. 1 is a partially omitted vertical sectional view of a compressor of the present invention.

FIG. 2 is a partial cross-sectional view showing another embodiment.

FIG. 3 is a partial sectional view showing still another embodiment.

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

 A compression element A1 discharge port A2 suction chamber 2 first scroll 3 second scroll 4 high pressure pipe 5 high pressure side chamber 6 low pressure pipe 7 low pressure side chamber 9 oil sump 11 motor 15 oil injection passage 16 temperature detection sensor 18 open / close valve 29 differential pressure valve 29a valve Body 29b valve spring

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F04C 29/02 331 A 6907-3H

Claims (4)

[Claims] 1. A discharge port having a horizontal scroll 1 having a first scroll 2 and a second scroll 3 and providing a working space at the center by a relative orbiting motion of the first and second scrolls 2 and 3. A compression element A, which is moved in the direction of A1 while reducing its volume to perform a compression action, is internally provided, and a high pressure side chamber 5 in which a high pressure pipe 4 is opened on one side of the compression element A and a low pressure side on the other side. A horizontal scroll compressor which defines a low pressure side chamber 7 in which a pipe 6 is open, and an oil sump 9 is provided in a lower portion of the low pressure side chamber 7, wherein the oil sump 9 and the suction chamber A2 of the compression element A are provided. A horizontal scroll compressor, characterized in that an oil injection passage 15 is provided between the oil injection passage 15 and an opening / closing means for opening the oil injection passage 15 when the gas circulation amount is low and for closing the gas injection passage 15 when the gas circulation amount is high. 2. A temperature detection sensor 16 for detecting the temperature of the discharge gas discharged from the compression element A is provided, and the temperature sensor 16 is opened in the oil injection passage 15 when the temperature of the discharge gas becomes higher than a predetermined temperature. The horizontal scroll compressor according to claim 1, further comprising an opening / closing valve 18 that closes when the temperature becomes lower. 3. A low speed side chamber 7 is provided with a variable speed motor 11 for driving a drive shaft 10, which has a variable rotation speed by frequency conversion.
The horizontal scroll compressor according to claim 1, wherein the oil injection passage 15 is provided with an opening / closing valve 18 which opens when the rotation speed of the motor 11 is equal to or lower than a predetermined rotation speed and closes when the rotation speed exceeds a predetermined rotation speed. 4. A valve body 29a for opening and closing the oil injection passage 15, and a valve spring 2 for urging the valve body 29a in the opening direction.
9. The horizontal type according to claim 1, further comprising a differential pressure valve 29, which is configured by 9b and which opens the valve element 29a by the valve spring 29b when the differential pressure between the low pressure side chamber 7 and the suction chamber A2 becomes smaller than a predetermined value. Scroll compressor.