CN101205920B - Device for preventing cyclone compressor from superheating - Google Patents

Abstract

The invention provides an overheating prevention device for scroll compressor, when the scroll compressor operates improperly, an open sectional area of a switching unit is designed to be increased to recover and collect oil of a high pressure part, so that the operation of the overheating prevention device can be more quickly, thereby improving the running efficiency of the overheating prevention device of the scroll compressor. The related overheating prevention device of the scroll compressor has simple structure, simple and convenient manufacture and installation. The overheating prevention device of the scroll compressor of the invention comprises an oil conduct part which conducts oil collected in an oil collecting part which is arranged on a fixed scroll into a motor protection apparatus of a drive motor; a bimetallic material tube which is made of materials with different heat expansion coefficients, provided with one side communicated with the oil conduct part, opens and closes the oil conduct part while generating changes along with the variation and curve degree of oil temperature.

Description

Overheat prevention device for scroll compressor

technical field

The present invention relates to a scroll compressor, in particular to an overheating prevention device (OVERHEATING PREVENTION) for a scroll compressor that increases the open cross-sectional area of an opening and closing unit for collecting oil in a high-pressure portion, thereby enabling faster operation and improving operating efficiency APPARATUS FOR SCROLL COMPRESSOR).

Background technique

Generally speaking, a scroll compressor is a low-noise high-efficiency compressor widely used in the field of air conditioners. The operation mode of the scroll compressor is as follows: the two scrolls perform relative rotational movement, and a plurality of pairs of compression chambers are formed between the scrolls; the volume of the compression chamber is continuously moved to the center while the volume is reduced, so that the continuously inhaled The refrigerant is compressed and then discharged after compression. The conventional scroll compressor constituted as described above is provided with an overheat preventing device for preventing the scroll compressor from overheating when the scroll compressor is not operating normally.

Next, with reference to Fig. 1 to Fig. 4, the overheat preventing device of the conventional scroll compressor will be described.

1 to 4 are views showing an overheat preventing device of a conventional scroll compressor. Fig. 1 shows a longitudinal sectional view of the internal structure of a prior art scroll compressor. Fig. 2 is a longitudinal sectional view showing the internal structure of an overheat preventing device of a prior art scroll compressor. Fig. 3 is a plan view showing the internal structure of an overheat preventing device of a prior art scroll compressor. Fig. 4 is a longitudinal sectional view showing an open state of the overheat preventing device of the prior art scroll compressor.

As shown in Figures 1 to 4, the scroll compressor in the prior art is composed of the following parts: a housing 110 that forms a closed storage space inside; a compression part 130 that is housed in the housing 110 and compresses the refrigerant ; The driving motor 170 provided inside the housing 110 and providing a driving force to the compression part 130 ;

Here, a suction pipe 111 and a discharge pipe 113 for sucking and discharging refrigerant are provided on one side of the housing 110 . An upper bracket 115 and a lower bracket 117 are also provided inside the casing 110 , and the upper bracket 115 and the lower bracket 117 are used to support the compression part 130 and the driving motor 170 .

In addition, an oil storage portion 119 for storing oil 120 is formed at the bottom inside the casing 110 . The driving motor 170 is composed of a stator 171 fixed inside the casing 110 , and a rotor 173 provided inside the stator 171 and rotating around a rotating shaft 175 .

In addition, a motor protection device 179 is provided on one side of the stator 171, and the motor protection device 179 can stop the driving motor 170 when overheated. The shaft center of the rotating shaft 175 is formed with an oil supply passage 176 for supplying the oil 120 upward. An eccentric portion 177 is formed at the upper end of the rotating shaft 175 .

The compression part 130 is composed of the following parts: a scroll 132 with an involute shape, and a fixed scroll 131 fixed to the upper bracket 115; a scroll 162 with an involute shape, and combined with the eccentric part 177, And the rotating reel 161 is rotatable relative to the fixed reel 131 and the upper frame 115 . A discharge port 134 for discharging compressed refrigerant is formed at a central portion of the fixed scroll 131 . A high and low pressure separation plate 141 is provided on the upper side of the fixed reel 131, and the high and low pressure separation plate 141 divides the inner space of the housing 110 into a high pressure side and a low pressure side.

In addition, the fixed reel 131 is formed with a communication portion 135 for communicating the high pressure side and the low pressure side. A thermal reaction valve assembly 145 is disposed on the upper surface of the fixed reel 131 . The role of the thermal reaction valve assembly 145 is to open the communication portion 135 when the temperature of the refrigerant gas rises, so that the oil contained in the refrigerant on the high-pressure side flows to the low-pressure side.

In addition, a valve accommodating portion 137 recessed along its thickness direction is provided on the upper surface of the fixed reel 131 , and the valve accommodating portion 137 is used for accommodating and setting the thermal reaction valve assembly 145 . One side of the communicating portion 135 is provided with a pipe 152 whose function is to guide the oil flowing through the communicating portion 135 to the motor protector 179 .

The thermal response valve assembly 145 arranged on the scroll compressor of the prior art constituted as described above is composed of the following parts: a disc-shaped valve plate 146; a circular hook shape, and extends outward along the radial direction A plurality of fingers (fingers) 150; a retainer 149 disposed on the upper side of the valve plate 146;

Here, the valve plate 146 is formed by layering two metal materials having mutually different thermal expansion coefficients in the thickness direction, and the two metal materials are bonded together. A shielding portion 147 is formed at a central portion of the valve plate 146 . The shielding portion 147 is protruded downward along the thickness direction, and serves to shield the entrance of the communication portion 135 . A plurality of through holes 148 are formed around the shielding portion 147 .

That is, the thermal response valve assembly 145 is formed by combining metal components with different thermal expansion coefficients, and a plurality of fingers 150 for pressing into the fixer 149 are provided on the outside of the fixer 149 . When the scroll compressor is in a normal state, the valve plate 146 is in a closed state; when the scroll compressor is in an abnormal state, the valve plate 146 is in an open state.

When the temperature of the discharged refrigerant gas rises, in the thermal reaction valve assembly 145 configured as described above, the valve plate 146 deforms and rises at the inlet of the communicating portion 135 . Therefore, the oil flows into the communication portion 135 through the through-hole 148 , and flows to the low-pressure side along the pipe 152 .

That is, the oil flowing from the high-pressure side to the low-pressure side inside the housing 110 increases in temperature as the internal temperature of the scroll compressor rises. When the temperature of the oil rises excessively, the motor protection device 179 starts to operate, and finally stops the driving motor 170, thereby preventing the scroll compressor from overheating.

However, the conventional scroll compressor overheat prevention device configured as described above has the following problems. The open cross-sectional area of the valve plate 146 of the thermal response valve assembly 145 constituting the overheating prevention device of the scroll compressor of the prior art is already set when the thermal response valve assembly 145 is made, so its cross-section The area will not be larger than the set cross-sectional area. Therefore, the cross-sectional area of the circulating oil will be narrow, therefore, the amount of oil delivered to the motor protection device 179 will be relatively small, thereby prolonging the operation and opening time of the motor protection device 179 .

In addition, due to the complex structure of the thermal response valve assembly 145 , the work of manufacturing and installing it to the scroll compressor will be cumbersome, thereby increasing the manufacturing cost.

Contents of the invention

The purpose of the present invention is to provide a new structure of an overheating prevention device for a scroll compressor, which can recover the oil collected in the high pressure part of the scroll compressor to the low pressure part more quickly, thereby reducing oil discharge. When the scroll compressor is not operating normally, in order to recover the oil collected in the high-pressure part, the open cross-sectional area of the switching unit is made larger than that of the overheating prevention device in the prior art, so that the operation of the overheating prevention device is faster and the improvement is further improved. The operating efficiency of the overheating prevention device of the scroll compressor. At the same time, the overheating prevention device of the scroll compressor of the present invention has a simple structure, and is also very convenient to manufacture and install.

In order to achieve the above object, the technical scheme adopted in the present invention is:

The involved scroll compressor includes the following components: a casing; a drive motor arranged inside the casing to generate driving force and provided with a motor protection device that temporarily cuts off the power supply of the motor when overloaded; The rotating reel forms a compression chamber, on which is provided a fixed reel that collects oil separated from the refrigerant; an oil guide that guides the oil collected in the oil collector to the motor protection device that drives the motor.

The overheat prevention device for a scroll compressor according to the present invention includes materials with different coefficients of thermal expansion, one side of which communicates with the oil guide, and the degree of bending of the oil guide changes while the oil temperature changes. Made of bimetal material tube. The oil collecting part is provided with a protruding oil cut-off part which can be disengaged from the inlet end of the bimetal tube.

In order to achieve the above object, another technical solution adopted by the present invention is:

The overheat prevention device of the involved scroll compressor is composed of the following parts: a casing; a driving motor arranged inside the casing to generate driving force, and provided with a motor protection device that temporarily cuts off the power supply of the motor when overloaded; Inside the casing, a compression chamber is formed with the rotating scroll, and a fixed scroll that collects the oil separated from the refrigerant is installed on the top of the compression chamber; a motor protection device that guides the oil collected in the oil collection section of the fixed scroll to the drive motor The oil guide part; it is fixedly combined with one side of the oil guide part, and in order to open and close the oil guide part with the change of the oil temperature collected in the oil collection part, it is formed by winding bimetal material strips with different thermal expansion coefficients in different sections Bimetal material trays.

The effect of the invention

The overheat prevention device of the scroll compressor of the present invention configured as described above has the following effects. Since the oil collected in the high-pressure part of the scroll compressor is recovered to the low-pressure part, oil discharge is reduced. In addition, when the scroll compressor is not operating normally, in order to recover the oil collected in the high-pressure part, the opening cross-sectional area of the switching unit is larger than that of the conventional overheating prevention device, so that the operation of the overheating prevention device is faster. Furthermore, the operating efficiency of the overheat prevention device of the scroll compressor is improved. At the same time, the overheating prevention device of the scroll compressor of the present invention has a simple structure, and is also easy to manufacture and install.

Description of drawings

1 to 4 are views showing an overheat preventing device of a conventional scroll compressor.

Fig. 1 is a longitudinal sectional view showing the internal structure of a conventional scroll compressor.

Fig. 2 is a longitudinal sectional view showing an internal structure of an overheat preventing device of a conventional scroll compressor.

Fig. 3 is a plan view showing an internal structure of an overheat preventing device of a prior art scroll compressor.

Fig. 4 is a longitudinal sectional view showing an open state of an overheat preventing device of a conventional scroll compressor.

5 to 12 are diagrams showing an overheat prevention device of a scroll compressor according to an embodiment of the present invention.

5 is a longitudinal sectional view showing an internal structure of a scroll compressor provided with an overheat preventing device according to a first embodiment of the present invention.

Fig. 6 is an enlarged longitudinal sectional view showing the overheat prevention device of the scroll compressor according to the first embodiment of the present invention.

7 is a longitudinal sectional view showing an open state of the overheat preventing device of the scroll compressor according to the first embodiment of the present invention.

Fig. 8 is an enlarged longitudinal sectional view showing a modified example of the overheat preventing device of the scroll compressor according to the first embodiment of the present invention.

9 and 10 are schematic diagrams showing the structure of an overheating prevention device for a scroll compressor according to a second embodiment of the present invention.

11 is a side view showing an open state of an overheat preventing device of a scroll compressor according to a second embodiment of the present invention.

Fig. 12 is a longitudinal sectional view showing a modified example of the overheat preventing device of the scroll compressor according to the embodiment of the present invention.

Explanation of the marks of the main parts of the drawings

110: shell 120: oil

130: Compression part 131: Fixed reel

134: Discharge port 140: O-ring

144a: High pressure side 144b: Low pressure side

155: Tubing 161: Spinning Reel

170: Drive motor 179: Motor protection device

200: Opening and closing device 205: Connecting part

207: Oil collection department 208: Inlet port

300: bimetal material tube 301: rectangular surface

302: Inclined surface 400: Oil cutting part

500: bimetal material tray 501: bimetal material belt

510: the first expansion part 520: the second expansion part

530: Oil suction groove

Detailed ways

Next, the embodiment of the overheating prevention device of the scroll compressor of the present invention will be described in detail with reference to the accompanying drawings.

In order to facilitate the description of the overheating prevention device of the scroll compressor according to the embodiment of the present invention with reference to the accompanying drawings, the description part of the scroll compressor of the prior art and the same part of the structure in the drawings attached for explanation are given the same symbol.

5 to 12 are diagrams showing an overheat prevention device of a scroll compressor according to an embodiment of the present invention. 5 is a longitudinal sectional view showing an internal structure of a scroll compressor provided with an overheat preventing device according to a first embodiment of the present invention.

As shown in FIG. 5 , the scroll compressor provided with the overheating prevention device according to the first embodiment of the present invention includes the following parts: a housing 110 ; arranged inside the housing 110 to generate driving force, and is provided with a temporary cut-off function when overloaded. The driving motor 170 of the motor protection device 179 of the motor power supply; is arranged inside the casing 110, forms a compression chamber with the rotating scroll 161, and is provided with the fixed scroll 201 of the oil collecting part 207 collecting the oil 120 separated from the refrigerant; The oil 120 collected by the oil collection part 207 of the fixed reel 201 is guided to the oil guide part of the motor protection device 179 of the driving motor 170; one end thereof communicates with the oil guide part, and the degree of bending changes with the temperature of the oil 120 At the same time, open and close the bimetal material tube 300 made of materials with different thermal expansion coefficients.

Here, the bimetal pipe 300 is composed of a first pipe portion 310 with a small thermal expansion coefficient and a second pipe portion 320 with a large thermal expansion coefficient. Moreover, the first tube part 310 and the second tube part 320 are formed by butting along their outer tube surfaces.

In addition, the inlet end of the bimetallic tube 300 is a right-angled surface 301 or an inclined surface 302 with respect to an oil passage (not shown) formed inside the bimetallic tube 300 . And, the other end of the bimetal tube 300 is fixed to one side of the oil guide.

In addition, an O-ring (Oldham's ring) 140 is arranged between the rotating reel 161 and the upper bracket 115, and the function of the O-ring (Oldham's ring) 140 is to prevent the rotating reel 161 from rotating.

Next, with reference to FIGS. 6 and 7 , the operation of the overheat prevention device for the scroll compressor configured as described above will be described.

Fig. 6 is an enlarged longitudinal sectional view showing the overheat prevention device of the scroll compressor according to the first embodiment of the present invention. 7 is a longitudinal sectional view showing an open state of the overheat preventing device of the scroll compressor according to the first embodiment of the present invention.

As shown in FIG. 6, the overheating prevention device of the scroll compressor according to the first embodiment of the present invention includes the following parts: In order to collect the oil 120 contained in the refrigerant, the upper surface of the fixed scroll 131 is recessed along the rear direction. Oil collecting part 207; In order to make the high pressure side 144a formed on one side of the fixed reel 131 and the low pressure side 144b formed on the other side of the fixed reel 131 communicate with each other, the oil guide through the oil collecting part 207 to the outside of the fixed reel 131 part; one end of which fixes the oil guide part and communicates with the oil guide part, and its bending degree changes with the temperature of the oil 120. Metal material pipe 300 .

Here, the bimetal material pipe 300 is composed of a first pipe portion 310 with a small coefficient of thermal expansion and a second pipe portion 320 with a large coefficient of thermal expansion, and the first pipe portion 310 and the second pipe portion 320 are formed along the outer surface of the pipe. butted. Since the first pipe part 310 and the second pipe part 320 have different coefficients of thermal expansion, the bimetal pipe 300 may be bent as the temperature of the oil 120 changes.

That is, as shown in FIG. 6 , when the scroll compressor is in normal operation, the temperature of the oil 120 is low, so the bimetal tube 300 maintains its original state. On the contrary, under the influence of the high temperature generated when the scroll compressor is in an abnormal operation state, the temperature of the oil 120 also rises to a high temperature. The shape of the bimetal material tube 300 is bent and changed to a shape as shown in FIG. 7 .

At this time, the bimetal tube 300 is bent toward the side of the first tube part 310 with relatively small thermal expansion. Therefore, the overall shape of the bimetal tube 300 is bent. The oil 120 collected in the oil collecting portion 207 passes through one end of the bimetal tube 300 and flows into an oil passage (not shown) formed therein.

In addition, as shown in FIGS. 6 and 7 , the oil collecting portion 207 constituting the overheat preventing device of the scroll compressor according to the first embodiment of the present invention is provided with an oil cutting portion 400 . When the scroll compressor is in normal operation, the inlet end of the bimetal tube 300 contacts one side of the oil cutting part 400 , thereby cutting off the inflow of the oil 120 . When the scroll compressor is not operating normally, the bimetal tube 300 bends, so that the inlet end of the bimetal tube 300 is separated from one side of the oil cut-off part 400, so that the oil 120 can pass through the inlet port. inflow.

That is, since the oil collecting portion 207 is provided with the oil cutting portion 400 as described above, the overheating prevention device of the scroll compressor, as shown in FIG. The inlet end of 300 is in contact with one side surface of oil cutoff part 400 to cut off the inflow of oil 120 .

When the scroll compressor is not in normal operation, as shown in FIG. 7 , under the influence of the difference in thermal expansion between the first pipe part 310 and the second pipe part 320, the bimetal material pipe 300 bends. Therefore, the bimetal The inlet end of the material pipe 300 is detached from one side of the oil cut-off part 400, so that the oil 120 can flow to the oil guide part through the oil passage (not shown) formed inside the bimetal material pipe 300, and then, from the oil guide The other side of the part is transmitted to the motor protection device that stops the operation of the driving motor when the scroll compressor is overheated, so that the scroll compressor can be prevented from overheating.

Here, the oil 120 has a certain viscosity, is mixed with the refrigerant in a spray state, and is collected in the oil collection part 207 after being solidified. When its temperature is relatively low, its viscosity is relatively high, so it will not flow. However, when the scroll compressor is running, if overheating occurs, the oil will become high temperature due to the heat transferred to the scroll compressor. At this time, the viscosity of the oil is relatively low and it flows easily.

As described above, the oil 120 , whose viscosity is reduced at high temperature so that it can easily flow, flows through the oil passage (not shown) formed inside the bimetal pipe 300 , the oil guide, and the oil pipe 155 . to motor protection device 197.

形状弯曲的；在涡旋式压缩机处于非正常运转状态的时候，在第一管部310及第二管部320的热膨胀的作用下，产生弯曲，从而变化成如图7所示的“I”形状。另外，为了使油切断部400可以接触到以

形状弯曲的双金属材料管300的一端，油切断部400设置在油收集部207的底面，并且，与双金属材料管300的位置相邻接。The shape of the above-mentioned bimetal material tube 300 is as follows: when the scroll compressor is in normal operation, as shown in FIG.

The shape is curved; when the scroll compressor is in an abnormal operating state, under the action of thermal expansion of the first pipe part 310 and the second pipe part 320, the bending occurs, thus changing into "I" as shown in Figure 7 "shape. In addition, in order for the oil cut-off part 400 to be in contact with the following

At one end of the curved bimetallic tube 300 , the oil cut-off part 400 is provided on the bottom surface of the oil collecting part 207 and is adjacent to the position of the bimetallic tube 300 .

However, the shape of the bimetal tube 300 and the shape of the oil cut-off portion 400 are not limited to the above-mentioned shapes. As for the bent shape of the bimetal tube 300, any other shape and position of the bimetal tube 300 can also be adopted if the bimetal tube 300 can be opened and closed.

As mentioned above, the inlet end of the bimetal tube 300 where the oil 120 flows is formed at right angles to the surface 301 with respect to the direction of the oil passage formed inside the bimetal tube 300 , but it is not limited thereto. If the oil 120 can pass through the oil passage inside the bimetal tube 300 and flow smoothly, and the oil 120 can flow into the oil passage smoothly, no matter what shape it is.

Next, a modified example of the inlet end of the bimetal material tube 300 will be described with reference to FIG. 8 .

Fig. 8 is an enlarged longitudinal sectional view showing a modified example of the overheat preventing device of the scroll compressor according to the first embodiment of the present invention. As shown in FIG. 8 , the shape of the inlet end of the bimetal tube 300 constituting the overheating prevention device of the scroll compressor according to the first embodiment of the present invention is as follows: relative to the direction of the oil passage formed inside the bimetal tube 300 , The inlet end of the bimetal tube 300 is an inclined surface 302 with a certain inclination.

That is, the inlet end of the bimetal tube 300 constituting the overheating prevention device of the scroll compressor according to the first embodiment of the present invention is inclined at a certain angle with respect to the direction of the oil passage formed inside the bimetal tube 300 , thereby forming an inclined surface 302 . Therefore, the cross-sectional area through which the oil 120 flows into an oil passage (not shown) can be increased.

When the scroll compressor is running, the oil 120 can flow into the oil formed inside the bimetal tube 300 more smoothly on the inclined surface 302 formed at one end of the bimetal tube 300 with a larger cross-sectional area. Therefore, the oil 120 can flow to the motor protection device 197 more smoothly, thereby preventing the scroll compressor from overheating.

As described above, the inlet end of the bimetal tube 300 forms a right-angled surface 301 or an inclined surface 302 with respect to the direction of the oil passage formed inside the bimetal tube 300 . However, it is not limited to the above-mentioned shape, and any shape can be used as long as the oil 120 can flow in smoothly.

In addition, the bimetal tube 300 constituting the overheating prevention device of the scroll compressor according to the first embodiment of the present invention is fixed by pressing one end thereof into the side of the oil guide, so that the surrounding environment is under pressure. Or when it is impacted, its binding force will not decrease.

Next, the structure of the overheating prevention device of the scroll compressor according to the second embodiment of the present invention will be described with reference to FIGS. 9 to 11 .

9 and 10 are schematic diagrams showing the structure of an overheating prevention device for a scroll compressor according to a second embodiment of the present invention. 11 is a side view showing an open state of an overheat preventing device of a scroll compressor according to a second embodiment of the present invention.

The scroll compressor provided with the overheat preventing device according to the second embodiment of the present invention as shown in FIGS. 9 to 11 includes the following parts: a casing 110; The drive motor 170 of the motor protection device 179 that temporarily cuts off the power supply of the motor; it is arranged inside the casing 110 and forms a compression chamber with the rotating reel 161, and the fixed reel 201 of the oil collection part 207 that collects the oil 120 separated from the refrigerant is arranged on it The oil 120 collected in the oil collection part 207 of the fixed reel 201 is guided to the oil guide part of the motor protection device 179 of the drive motor 170; fixedly combined with one side of the oil guide part, and along with the oil collection part collects the oil 120 The temperature change opening and closing oil guide part is a bimetallic material tray 500 formed by winding bimetallic material strips 501 with different coefficients of thermal expansion in different sections.

Here, the bimetal strip 501 is formed by abutting the first expansion part 510 made of a material with a small thermal expansion coefficient and the second expansion part 520 made of a material with a large thermal expansion coefficient along its length direction, and the second The first expansion part 510 and the second expansion part 520 are arranged alternately at a certain interval.

That is, the bimetal material strips 501 in which the first expansion parts 510 made of a material with a small thermal expansion coefficient and the second expansion parts 520 made of a material with a large thermal expansion coefficient are alternately arranged are wound to form a bimetal material tray 500 Appearance. Due to the difference in the thermal expansion coefficient of each material, as the temperature of the oil 120 changes, the part with a large thermal expansion coefficient in the first expansion part 510 and the second expansion part 520 expands and expands, thereby forming an oil inflow channel for the oil 120 to flow in. groove 530 , and the oil 120 flows in through the oil inflow groove 530 . Alternatively, the expansion of the first expansion part 510 and the second expansion part 520 is eliminated, and the shutoff oil 120 flows in through the oil inflow groove 530 .

Here, the first expansion part 510 and the second expansion part 520 constituting the bimetallic material strip 501 may be made of two materials with significantly different thermal expansion coefficients. The first expansion part 510 may be made of copper, lead alloy or nickel, manganese, iron alloy or nickel, molybdenum, iron alloy or manganese, nickel, copper alloy material with relatively large thermal expansion coefficient. The second expansion part can be made of nickel or iron alloy material with small thermal expansion coefficient.

The bimetallic material tray 500 formed by the above-mentioned bimetallic material belt 501 maintains its original shape because the oil 120 is in a low temperature state when the scroll compressor is operating normally. When the scroll compressor is in abnormal operation, when the heat generated is transferred to the oil and the temperature of the oil 120 rises to a high temperature, the first expansion part 510 and the second expansion part 520 will change their shape due to thermal expansion. change.

At this time, in the bimetal material tray 500, the first expansion part 510 made of a material with a large thermal expansion expands more than the second expansion part 520 made of a material with a small thermal expansion. The gap of the surface on the side of the expansion part 510 becomes large, and the oil inflow groove 530 for the inflow of the oil 120 is formed. The oil 120 collected in the oil collecting portion 207 flows through the oil inflow groove 530 into an oil passage (not shown) formed therein. The oil 120 flowing in through the oil inflow groove 530 flows smoothly to the motor protector 197 through an oil passage (not shown) and an oil guide formed inside the bimetal tray 500 .

In addition, in order to prevent the bimetal tray 500 from sinking downward under the pressure of the oil 120, the bimetal tray 500 is wound upward from the bottom of the oil collection part 207 by a bimetal strip 501 to become smaller and smaller. conical shape. And, one end thereof is press-fitted and fixed to one side of the oil guide.

In the overheat prevention device of the scroll compressor of the present invention in each of the above-mentioned embodiments, the oil guide part is composed of the following parts: the communication part 205; guides the oil 120 flowing through the communication part 205 to the motor; Oil pipe 155 of protection device 179 . In order to communicate the high pressure side 144a formed on one side of the fixed spool and the low pressure side 144b formed on the other side of the fixed spool, the communication portion 205 penetrates from the oil collecting portion 207 to the outside of the fixed spool 201 .

Next, a specific structure constituting the oil guide communication portion 205 will be described with reference to FIG. 12 .

Fig. 12 is a longitudinal sectional view showing a modified example of the overheat preventing device of the scroll compressor according to the embodiment of the present invention. As shown in FIG. 12, the oil guide part of the overheat prevention device of the scroll compressor provided in each embodiment of the present invention is inclined to the side where the motor protection device is provided with respect to the axial direction of the scroll compressor. at a certain angle.

In the overheating prevention device of the scroll compressor in each embodiment of the present invention as described above, the communication part 205 in the oil guide part is to make the high pressure side 144a formed on the side of the fixed scroll and the high pressure side 144a formed on the fixed side. The low-pressure side 144b on the other side of the spool communicates with each other, and passes through the inside of the fixed spool 201 to the outside of the fixed spool 201 from the inlet (not shown) opened on the bottom surface of the oil collection part 207 . By changing the forming direction of the communicating portion 205, the refrigerant can flow more smoothly.

That is, the communication portion 205 is inclined at a certain angle with respect to the axial direction of the scroll compressor, as described above, so that the oil 120 flowing inside the communication portion 205 can be more stable under the action of gravity. The flow is carried out smoothly, therefore, the rapid operation of the overheating prevention device is possible.

Claims (5)

1. An overheating prevention device for a scroll compressor, the scroll compressor involved includes: a casing; it is arranged inside the casing to generate driving force, and is provided with a motor protection device that temporarily cuts off the power supply of the motor when it is overloaded The driving motor of the device; it is installed inside the casing, forming a compression chamber with the rotating reel, and the fixed reel is arranged on it to collect the oil collection part that separates the oil from the refrigerant; the oil collected in the oil collection part of the fixed reel is guided to the drive The oil guide of the motor protection device of the motor; It is characterized in that the overheating prevention device of the scroll compressor includes one side of which communicates with the oil guide, and is made of materials with different thermal expansion coefficients while opening and closing the oil guide while its bending degree changes with the change of oil temperature. The formed bimetal material pipe; the oil collecting part is provided with a protruding oil cut-off part, and the oil cut-off part can be disengaged from the inlet end of the bimetal material pipe. 2. The overheating prevention device for a scroll compressor according to claim 1, characterized in that: the bimetal tube is made of a first tube part made of a material with a small thermal expansion coefficient and a first tube part made of a material with a large thermal expansion coefficient. The second pipe part is formed by butting along its outer pipe surface. 3. The overheat prevention device for a scroll compressor according to claim 1, characterized in that: the inlet end of the bimetal tube is at right angles or inclined relative to the direction of the oil passage formed inside the bimetal tube face. 4. The overheating prevention device for a scroll compressor according to claim 1, wherein one end of the bimetal tube is press-fitted and fixed to one side of the oil guide. 5. The overheating prevention device for a scroll compressor according to claim 4, wherein the oil guide part is composed of the following parts: in order to make the high pressure side formed on one side of the fixed scroll and the high pressure side formed on the other side of the fixed scroll The low-pressure side of the side communicates with each other, so that the oil collection part penetrates to the outside of the fixed reel; the oil flowing through the communication part is guided to the oil pipe of the motor protection device; the communication part is relatively to the shaft of the scroll compressor The direction is inclined at a certain angle to the direction where the motor protection device is arranged.

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