KR100504912B1 - Internal pressure regulator valve in compressor - Google Patents

Abstract

The present invention provides a conventional internal pressure control valve of a compressor, comprising: a valve body having a suction port formed to be vented in a discharge pressure region of a compressor, a discharge port formed to be vented to a suction pressure region, and a flow path connecting the suction port and the discharge port; ; A sliding member provided in the valve body so as to be movable between a closed position of closing the flow path and an open position of opening the flow path; An elastic member installed between the sliding member and the main body such that the sliding member is positioned in a closed position; A shape is deformed according to temperature, and the heat reaction member is installed so that the flow path is opened at a low temperature and the flow path is closed at a high temperature when the sliding member is located at an open position; By providing an internal pressure control valve of the compressor configured to include, it is possible to prevent the hot gas from flowing into the suction pressure region to prevent melting of the sealing material of the compression portion and carbonization of the oil.

Description

INTERNAL PRESSURE REGULATOR VALVE IN COMPRESSOR}

The present invention relates to an internal pressure regulating valve of a compressor, and more particularly, to an internal pressure regulating valve of a compressor which prevents hot gas from flowing into a suction pressure region to prevent melting of a sealing material of a compression part and carbonization of oil.

Generally, a compressor converts mechanical energy into compressive energy of a compressive fluid, which is divided into reciprocating, scrolling, and centrifugal (commonly referred to as turbo) and vane (commonly referred to as rotary). .

Among the scroll compressors, unlike the reciprocating type using the linear motion of the piston, the scroll compressor sucks and discharges the gas by using a rotating body such as a centrifugal type or a vane type. The scroll compressor is divided into a low pressure scroll compressor or a high pressure scroll compressor depending on whether suction gas or discharge gas is filled in the casing.

In the low pressure scroll compressor, as shown in FIG. 1, the upper frame 2 and the lower frame 3 are respectively fixed to upper and lower sides of the inner circumferential surface of the casing 1 filled with oil to an appropriate height, and the upper frame 2 A driving motor 4 consisting of a stator 4A and a rotor 4B is fixedly installed between the lower frame 3 and the lower frame 3, and a driving shaft 5 is formed at the center of the rotor 4B of the driving motor 4. The pivoting frame 6 is press-fitted through the upper frame 2, and the upper frame 2 is formed on the upper surface with a wrap 6a in an involute curve to be eccentrically coupled to the drive shaft 5. It is installed to be rotatably mounted, the fixed scroll is formed on the top surface of the swing scroll 6 is inlaid curve wrap (7a) to be engaged with the wrap (6a) of the swing scroll 6 to form a plurality of compression chamber ( 7) is fixedly installed at the edge of the upper frame (2), the casing on the upper side of the fixed scroll (7) (1) A high and low pressure separating plate 8 partitioning the inside into a discharge pressure region 9 serving as a high pressure portion and a suction pressure region 10 serving as a low pressure portion is fixed to an inner circumferential surface of the casing 1.

At one outer periphery of the fixed scroll (7) is formed a suction groove (7b) in communication with the suction pipe (SP) to the inside of the outermost wrap, the center of the fixed scroll (7) is in communication with the discharge pipe (DP) A discharge port 7c is formed, and a check valve assembly 9 for opening and closing the discharge port 7c is provided at the front end surface of the fixed scroll 7.

In addition, an internal pressure control valve 70 is installed through the high and low pressure separation plate.

The internal pressure regulating valve 70 vents the discharge pressure region 9 and the suction pressure region 10 when the discharge pressure region 9 is higher than a value set for the suction pressure region 10. This prevents the pressure difference from growing beyond the set value.

This is to prevent cracks in the welded portion of the upper case 11 when the pressure difference between the suction pressure region 10 and the discharge pressure region 9 is excessive.

In the figure, 5a, which is not described, is an oil oil, and 8a is a gas discharge hole.

The conventional scroll compressor configured as described above operates as follows.

That is, while the rotor 4B rotates together with the drive shaft 5 inside the stator 4A by the applied power, the turning scroll 6 is eccentrically rotated by an eccentric distance, and the turning scroll ( 6) is rotated by the distance from the center of the shaft by the Old Daming (unsigned) as the turning radius, and a plurality of compression chambers are formed between the two wraps (6a, 7a) with the fixed scroll (7). This compression chamber is moved to the center by the continuous turning motion of the turning scroll 6 to reduce the volume to further compress and discharge the sucked refrigerant gas.

Looking at this in more detail, the suction gas filled in the suction pressure region of the casing 1 through the suction pipe (SP) through the suction groove (7b) of the fixed scroll (7) opened during the swinging movement of the swinging scroll (6) The suction gas is sucked into the outer compression chamber, and the suction gas is gradually compressed along the compression chamber and discharged through the discharge port 7c to the discharge pressure region, which discharges the gas while the check valve assembly 9 is opened. The gas is discharged to the refrigeration cycle system through the gaseous discharge hole 8a of the low pressure separating plate 8 and the discharge pipe DP.

At this time, the check valve assembly 9 is kept open by the high-pressure discharge gas continuously discharged from the compression chamber during the normal operation of the compressor, but during the abnormal operation of the compressor (over-compression or high vacuum operation) discharge chamber As the pressure of the pressure becomes relatively higher than that of the compression chamber, the check valve assembly 9B blocks the discharge port 7c of the fixed scroll 7 to prevent the reverse flow of the discharge gas.

In addition, when the pressure difference between the pressure in the discharge pressure region 9 and the pressure in the suction pressure region 10 becomes greater than or equal to a set value of the internal pressure control valve 70, the discharge pressure region is controlled by the operation of the pressure control valve 70. (9) communicates with the suction pressure region 10 to reduce the pressure difference.

However, even when the gas present in the discharge pressure region 9 is at a high temperature, when only the pressure difference reaches the set value or more, the hot gas is discharged to the suction pressure region 10 to carbonize the oil, and the tip chamber or the like melts. There is a problem that the function of the compressor is lost.

The present invention has been made in view of the above problems of the conventional low pressure scroll compressor, and when there is a high temperature gas in the discharge pressure region, the scroll can prevent the suction pressure region from being highly vacuumed during the operation of a constant compressor. It is an object of the present invention to provide a vacuum compression preventing device for a compressor.

According to an aspect of the present invention, there is provided a vacuum cleaner including: a valve body including a suction port formed to be vented in a discharge pressure region of a compressor, a discharge port formed to be vented in a suction pressure region, and a flow path connecting the suction port and the discharge port; A sliding member provided in the valve body so as to be movable between a closed position of closing the flow path and an open position of opening the flow path; An elastic member installed between the sliding member and the main body such that the sliding member is positioned in a closed position; A shape is deformed according to temperature, and the heat reaction member is installed so that the flow path is opened at a low temperature and the flow path is closed at a high temperature when the sliding member is located at an open position; It provides an internal pressure control valve of the compressor configured to include.

In addition, the thermal reaction member is preferably composed of a thermocouple formed by joining two metals with different thermal expansion amounts.

And, it is effective that the thermal reaction member is installed at the end of the sliding member for opening and closing the flow path.

In addition, the internal pressure control valve includes a support ball installed between the thermal reaction member and the sliding member; It is effective to include more.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, in describing the present invention, a detailed description of known functions or configurations will be omitted in order not to disturb the gist of the present invention.

In addition, the same reference numerals are given to the same and the same components as those described above, and detailed description thereof will be omitted.

2 to 7 is a view showing the configuration of an embodiment of the present invention, Figure 2 is a sectional view of the internal pressure control valve, Figure 3 is a sectional view of the valve body of Figure 2, Figure 4 is a sectional view of the sliding member of Figure 2 5 is a cross-sectional view of the lower cap of FIG. 2, FIG. 6 is an operation cross-sectional view of the internal pressure regulating valve of FIG. 2 in a low temperature and high pressure state, and FIG.

As shown in these figures, the internal pressure regulating valve 70 of one embodiment of the present invention is formed to be vented through the suction port 71 and the suction pressure region 10 formed to be vented to the discharge pressure region 9 of the compressor. A valve body 77 having a discharge port 72, a flow path 76 connecting the suction port 71 and the discharge port 72, a closed position for closing the flow path 76, and opening the flow path. Sliding member 73 provided on the valve body 77 so as to be movable between the open position, and the elastic member 74 provided between the sliding member 73 and the main body so that the sliding member 73 is located in the closed position. And, the shape is deformed in accordance with the temperature, when the sliding member 73 is located in the open position the heat reaction member 180 is installed so that the flow path 76 is opened at low temperatures and the flow path 76 is closed at high temperatures and , The thermal reaction member 180 and the sliding member 7 3) is configured to include a support ball 75 installed between.

The valve body 77 is formed with a '자' -shaped flow path 76, the inlet port 71 is formed on the upper end of the flow path 76, the discharge port 72 is formed at both ends. An elastic member receiving portion 80 penetrates to a lower end of the valve body 77 at a lower portion of the flow path 76.

The sliding member 73 includes a support ball accommodating portion 73c formed at an upper end to accommodate the support ball 75, a moving restraining jaw 73b formed by shortening an outer peripheral surface of the lower end thereof, and the elastic member 74. It is configured to include a lower surface support portion (73a) that is supported at one end.

In addition, the valve is configured to include a lower support cap 78 is coupled to the lower end of the elastic member receiving portion 80 to support the elastic member (74). The lower support cap 78 is configured to include a support rib (78a) formed to fold with the moving restraining jaw (73b) to limit the sliding member 73 to move below a certain degree.

The thermal reaction member 180 is composed of a thermocouple formed by joining two metals having different amounts of thermal expansion. In the low temperature state, the thermal reaction member 180 surrounds the support ball 75 as shown in FIG. Since two metals having different thermal expansion amounts are bonded to each other, the support ball 75 and the back are deformed into a shape as shown in FIG.

Hereinafter, the operation of one embodiment of the present invention will be described.

When the pressure difference between the pressure in the discharge pressure region 9 and the suction pressure region 10 is greater than the contact pressure of the elastic member 74 of the internal pressure control valve 70, the elastic member 74 contracts. As the elastic member 74 contracts, the sliding member 73 moves from the closed position of FIG. 2 to the open position of FIG. 6, so that the flow path 76 is opened, and the discharge pressure region ( The gas of 9) is discharged to the suction pressure region 10 to reduce the pressure difference. Therefore, the crack of the welded portion of the upper case 11 generated when the pressure difference between the suction pressure region 10 and the discharge pressure region 9 is excessive is prevented.

When the pressure difference between the pressure of the discharge pressure region 9 and the suction pressure region 10 is greater than the contact pressure of the elastic member 74 of the internal pressure control valve 70 and the temperature of the gas is high, the elastic member As the 74 contracts and the elastic member 74 contracts, even though the sliding member 73 moves from the closed position in FIG. 2 to the open position in FIG. As shown in FIG. 7, the support ball 75 and the back are deformed into a shape to prevent the flow path 76 from being opened. Therefore, the hot gas is prevented from flowing into the suction pressure region, thereby preventing melting of the sealing material of the compression section and carbonization of the oil.

In the above, the preferred embodiment of the present invention has been described by way of example, but the scope of the present invention is not limited to such specific embodiments, and may be appropriately changed within the scope described in the utility model registration claims.

The present invention provides an internal pressure control valve of a compressor that prevents hot gas from flowing into the suction pressure region to prevent melting of the sealing material of the compression part and carbonization of oil.

1 is a cross-sectional view of a conventional compressor

2 to 7 is a view showing the configuration of an embodiment of the present invention,

2 is a cross-sectional view of the internal pressure control valve

3 is a cross-sectional view of the valve body of FIG.

4 is a cross-sectional view of the sliding member of FIG.

5 is a cross-sectional view of the lower cap of FIG.

6 is a cross-sectional view of the operation of the internal pressure regulating valve of FIG.

7 is a cross-sectional view of the operation of the internal pressure regulating valve of FIG.

** Description of the symbols for the main parts of the drawings **

9: discharge pressure area 10: suction pressure area

71: suction port 72: discharge port

73: sliding member 74: elastic member

75: support ball 76: euro

77: valve body 180: thermal reaction member

Claims (4)

A valve body having a suction port formed to ventilate the discharge pressure region of the compressor, a discharge port formed to vent the suction pressure region, and a flow path connecting the suction port and the discharge port; A sliding member provided in the valve body so as to be movable between a closed position of closing the flow path and an open position of opening the flow path; An elastic member installed between the sliding member and the main body such that the sliding member is positioned in a closed position; A shape is deformed according to temperature, and the heat reaction member is installed so that the flow path is opened at a low temperature and the flow path is closed at a high temperature when the sliding member is located at an open position; Internal pressure control valve of the compressor, characterized in that configured to include. The method of claim 1, wherein the thermal reaction member An internal pressure control valve of a compressor, characterized in that the thermocouple formed by joining two metals having different thermal expansion amounts. The method of claim 2, wherein the thermal reaction member The internal pressure control valve of the compressor, characterized in that installed at the end of the sliding member for opening and closing the flow path. The method of claim 3, A support ball installed between the thermal reaction member and the sliding member; Internal pressure control valve of the compressor, characterized in that further comprises.