JP2009532628A - Compressor backflow prevention device - Google Patents

Abstract

  The backflow prevention device for a compressor according to the present invention is opened and closed by the pressure difference and the valve's own weight or elasticity by connecting the backflow prevention valve to the valve seat so as to be hinged or elastically opened and closed. Thus, the response speed is increased, thereby effectively preventing the discharged refrigerant from flowing backward and improving the efficiency of the compressor. Further, when the backflow prevention valve is opened, the backflow prevention valve can be prevented from colliding with the valve housing by the valve stop surface or the retainer, and the discharge noise of the compressor can be greatly reduced.

Description

  The present invention relates to a compressor, and more particularly to a backflow prevention device for a compressor.

  Generally, a compressor is a machine that compresses a low-pressure refrigerant to a high pressure. In the compressor, a drive motor that generates a driving force is installed in an inner space of a sealed casing, and a compression unit that compresses the refrigerant by the driving force of the driving motor is installed. The compressor is classified into a reciprocating compressor, a rotary compressor, a scroll compressor, a centrifugal compressor, and the like according to a method of compressing the refrigerant. Depending on the type of the compressor, the discharged refrigerant flows back into the internal space of the casing, thereby reducing the performance of the compressor or causing damage. Therefore, in order to prevent the discharged refrigerant from flowing back into the internal space of the compressor casing, a backflow prevention valve is further installed.

Hereinafter, a scroll compressor having a conventional backflow prevention valve will be described as an example.
The scroll compressor is a high-efficiency low-noise compressor widely applied in the field of air conditioners. The scroll compressor is provided with a compression unit that forms a compression chamber by engaging two scrolls together with a drive motor in an inner space of a sealed casing. In the scroll compressor, the refrigerant is sucked into the pair of compression chambers that are continuously moved by the swirling wrap of the orbiting scroll meshing with the fixed wrap of the fixed scroll and swirling, and the refrigerant is sucked into the respective compression chambers. The refrigerant moves along the turning trajectory of the orbiting scroll and is gradually compressed, and is continuously discharged from the final compression chamber to the internal space of the casing.

  As shown in FIG. 1, a conventional scroll compressor includes a casing 10 in which a suction pipe 11 and a discharge pipe 12 communicate with each other, and a main frame 20 and a subframe (see FIG. (Not shown), a drive motor 30 installed between the main frame 20 and the sub-frame to generate rotational force, and fixedly installed on the upper surface of the main frame 20, and a fixed wrap 42 on the bottom surface of the plate portion 41 The orbiting wrap 52 spirals so as to form a plurality of compression chambers P together with the fixed scroll 40 formed in a spiral and the fixed wrap 42 of the fixed scroll 40 by rotating while meshing with the fixed wrap 42 of the fixed scroll 40. Is installed between the orbiting scroll 50 and the orbiting scroll 50 and the main frame 20. An Oldham ring 60 that rotates to prevent rotation of the reel 50, a high-low pressure separating plate 70 that is coupled to the back surface of the fixed scroll 40 and divides the internal space of the casing 10 into a suction space 13 and a discharge space 14, and a discharge space 14 and a backflow prevention unit 80 for preventing the backflow of the compressed gas discharged to the discharge pipe 12.

  In such a conventional scroll compressor, when power is supplied to the drive motor 30, the drive shaft 33 of the drive motor 30 rotates together with the rotor 32, whereby the orbiting scroll 50 is moved by the Oldham ring 60 to the main frame 20. A pair of compression chambers P are continuously formed between the swirl wrap 52 and the fixed wrap 42. As the orbiting scroll 50 continues to orbit as described above, the refrigerant is sucked into the outermost compression chamber from the suction port 43 of the fixed scroll 40 and moved to the center along the orbit of the orbiting scroll 50 and compressed. Thereafter, the gas is discharged from the discharge port 44 of the fixed scroll 40 into the discharge space 14 of the casing 10 in the final compression chamber. This refrigerant is discharged to the condenser of the refrigeration cycle provided in the air conditioner or the like via the discharge pipe 12 and circulates through the refrigeration cycle.

  At this time, when the compressor is stopped, the pressure of the discharge space 14 becomes lower than the pressure of the discharge pipe 12, and the phenomenon that the refrigerant discharged to the discharge pipe 12 flows back to the discharge space 14 occurs. Is installed on the outlet side of the discharge space 14 and prevents the refrigerant discharged to the discharge pipe 12 from flowing back into the discharge space 14 due to a pressure difference.

  Thus, the backflow prevention unit installed in the exit side of discharge space is disclosed by patent documents 1-3. Such a conventional backflow prevention unit is configured such that the backflow prevention valve freely moves and opens and closes the discharge space and the discharge pipe by a pressure difference.

  Hereinafter, a conventional backflow prevention unit will be described in detail with reference to FIGS.

  A conventional backflow prevention unit 80 shown in FIG. 2 has a housing in which a first refrigerant passage 85 is formed so as to communicate the discharge space 14 of the casing 10 and the discharge pipe 12 and is fixedly installed on the inner peripheral surface of the casing 10. 81, a valve seat 82 which is fixedly installed on the inlet side of the housing 81 and has a second refrigerant passage hole 86 formed at the edge thereof, and is fixedly installed on the outlet side of the housing 81, and a third refrigerant passage hole in the center thereof 87 is formed of a thin plate so that it can freely move between the valve seat 82 and the stopper 83 to open and close the second refrigerant passage hole 86 of the valve seat 82, and a fourth refrigerant passage hole is provided at the center thereof. The backflow prevention valve 84 in which 88 is formed is comprised.

  The backflow prevention unit 80 configured as described above opens and closes the second refrigerant passage hole 86 of the valve seat 82 according to the operation state of the compressor, thereby smoothly discharging the refrigerant and preventing the backflow. . For example, when the compressor performs normal operation, the pressure in the discharge space 14 is higher than the pressure in the discharge pipe 12, so the backflow prevention valve 84 is pushed toward the stopper 83 due to the pressure difference, and the second refrigerant flow in the valve seat 82 is passed. The refrigerant discharged into the discharge space 14 through the opening 86 is discharged to the discharge pipe 12. On the other hand, when the compressor stops, the pressure in the discharge space 14 is lower than the pressure in the discharge pipe 12, so that the backflow prevention valve 84 is pushed toward the valve seat 82 due to the pressure difference, and the second refrigerant passage hole 86 in the valve seat 82. Is closed and the refrigerant discharged to the discharge pipe 12 is prevented from flowing back into the discharge space 12 of the casing 10.

  On the other hand, the conventional backflow prevention unit 80 shown in FIG. 3 does not include the housing, the stopper, and the valve seat separately, and is expanded so that the inlet side of the discharge pipe 12 has a step, and the backflow prevention valve 84 is accommodated. A housing 81 and a stopper 83 are formed, and a valve seat 82 is formed on the outer surface of the casing 10 accommodated on the inlet side of the discharge pipe 12. Also in this case, the backflow prevention valve 84 freely moves due to the pressure difference between the two sides to open and close between the discharge space 14 and the discharge pipe 12.

US Pat. No. 5,141,420 US Pat. No. 6,171,084 U.S. Pat. No. 6,428,292

  However, in such a conventional scroll compressor backflow prevention unit, since the backflow prevention valve 84 that opens and closes between the discharge space 14 and the discharge pipe 12 moves only by the pressure difference, the responsiveness of the backflow prevention valve 84 decreases. As a result, the closing speed of the backflow prevention valve 84 decreases and the refrigerant discharged to the discharge pipe 12 flows back, which causes a problem that the performance of the compressor deteriorates.

  Further, when the backflow prevention valve 84 is closed, it collides with the valve seat 82, and when it is opened, it collides with the stopper 83 to generate valve collision noise, thereby increasing the noise vibration of the compressor.

  The present invention has been made in order to solve the problem of such a backflow prevention unit of a conventional scroll compressor. By improving the response of the backflow prevention valve and quickly closing the backflow prevention valve, the refrigerant An object of the present invention is to provide a backflow prevention device for a compressor that can effectively prevent backflow and improve the performance of the compressor.

  Another object of the present invention is to provide a backflow prevention device for a compressor, which can reduce collision noise generated when the backflow prevention valve is opened and closed to reduce vibration noise of the compressor.

  In order to achieve the above object, the present invention provides a valve housing that is installed between an inner space of a sealed casing and a discharge pipe that communicates with the inner space, and is installed in the valve housing, A valve seat in which a refrigerant passage is formed to communicate the internal space and the discharge pipe; and a backflow prevention valve that is rotatably coupled to the valve seat and opens and closes the refrigerant passage in the valve seat. A backflow prevention device for a compressor is provided.

  Hereinafter, a backflow prevention device for a compressor according to an embodiment of the present invention will be described in detail with reference to FIGS.

  4 to 9 are diagrams showing a backflow prevention device for a scroll compressor according to an embodiment of the present invention.

  As shown in FIG. 4, the scroll compressor according to the embodiment of the present invention includes a casing 100 in which a suction pipe 110 and a discharge pipe 120 communicate with each other, a main frame 200 fixedly installed inside the casing 100, and the casing 100. A drive motor 300 that is fixedly installed in the internal space and generates a driving force, a fixed scroll 400 that is fixedly installed on the upper surface of the main frame 200, and an eccentricity with respect to the drive shaft 330 of the drive motor 300 that is placed on the upper surface of the main frame 200. Are installed between the orbiting scroll 500 and the main frame 200 to prevent rotation of the orbiting scroll 500. The orbiting scroll 500 is engaged with the fixed scroll 400 and revolves to form a pair of compression chambers P. Oldham ring 600 to be turned and the inner space of casing 100 The high / low pressure separating plate 700 that is divided into the inlet space 130 and the discharge space 140 is inserted and coupled to the discharge space 140 side of the casing 100, the inlet side communicates with the casing 100, and the outlet side is connected to the discharge pipe 120. And a backflow prevention device 800 that prevents the refrigerant discharged to the pipe 120 from flowing back into the discharge space 140 of the casing 100.

  A suction pipe 110 is connected in communication with the suction space 130 of the casing 100, and a discharge pipe 120 is connected to the discharge space 140 of the casing 100 on the outlet side thereof. The discharge pipe 120 is integrally connected to the valve housing 810 of the backflow prevention device 800 and connected to the discharge space 140.

  The plate portion 410 of the fixed scroll 400 and the plate portion 510 of the orbiting scroll 500 are formed with helical fixed wraps 420 and orbiting wraps 520 on the opposing surfaces, and the fixed wrap 420 and the orbiting wrap 520 are meshed and moved continuously. A pair of compression chambers P is formed. A suction port 430 that communicates the outermost compression chamber and the suction space 130 of the casing 100 is formed at the edge of the bottom surface on one side of the fixed scroll 400, and the final compression chamber and the casing are formed at the center of the fixed scroll 400. Discharge ports 440 that communicate with the 100 discharge spaces 140 are formed. A backflow prevention valve (not shown) can be installed at the outlet of the discharge port 440 so that the refrigerant discharged into the discharge space 140 of the casing 100 can be prevented from flowing back into the compression chamber P.

  The high / low pressure separating plate 700 is formed of an annular plate having a predetermined width so as to be coupled to the upper surface of the fixed scroll 400 and to the casing 100.

  As shown in FIG. 5 to FIG. 7, the backflow prevention device 800 is fixedly installed inside the valve housing 810 that is tightly coupled to the inner wall surface of the casing 100 and the inside of the valve housing 810. The valve seat 820 on which the valve 821 is formed and the refrigerant discharged and installed in the valve seat 820 so as to rotate within the valve housing 810 to open and close the refrigerant passage hole 821 of the valve seat 820. And a backflow prevention valve 830 for preventing backflow.

  The valve housing 810 is disposed in the discharge space 140 of the casing 100, and both ends thereof are open to communicate the discharge space 140 and the discharge pipe 120, and one end to which the discharge pipe 120 is connected is tapered among the open ends. It is formed in a cylindrical shape, and a part of the tapered portion can be inserted into the through hole 101 of the casing 100 and welded. Further, the valve housing 810 is configured such that the discharge pipe 120 is integrally coupled to the end portion of the tapered portion to form a module so that the discharge pipe 120 is coupled together when coupled to the casing 100. You can also.

  The valve housing 810 is formed with a seat support portion 811 so that the inlet side end portion thereof is reduced or protrudes from the inner peripheral surface to support the valve seat 820.

  The valve seat 820 is formed in an annular shape having a first coolant passage hole 821 at the center thereof, and is press-fitted into the valve housing 810, welded, or fixed by bolting. Here, the valve seat 820 can be formed integrally with the valve housing 810 without being manufactured separately.

  A pair of hinge protrusions 822 protrudes from the upper half of the valve seat 820 at a predetermined interval so that a hinge part 831 of a backflow prevention valve 830, which will be described later, can be inserted and rotated in the middle. A fixed-side hinge hole 823 is formed at the center of the hinge protrusion 822 so that the hinge pin 840 can be coupled with a movable-side hinge hole 833 of a backflow prevention valve 830 described later. Here, the fixed-side hinge hole 823 is formed at least on the same vertical line as the front end surface of the valve seat 820 so that the backflow prevention valve 830 can be smoothly closed not only by the pressure difference but also by its own weight, or the discharge of the refrigerant It is formed so as to be positioned on the discharge side with respect to the direction.

  Further, as shown in FIG. 5, the valve seat 820 has a seal projection 824 protruding around the refrigerant passage hole 821 so that the front end surface of the valve seat 820 can come into line contact with the compression surface of the backflow prevention valve 830. As shown in FIG. 6, when the backflow prevention valve 830 is closed, the impact caused by the collision of the backflow prevention valve 830 is reduced, and the refrigerant leaks between the backflow prevention valve 830 and the valve seat 820. The elastic ring 825 can be press-fitted and installed so that it can be prevented. Here, the elastic ring 825 is preferably formed in a circular cross-sectional shape so as to be in line contact with the compression surface of the backflow prevention valve 830. In some cases, the elastic ring 825 may be installed on the compression surface of the backflow prevention valve 830.

  As shown in FIGS. 5 to 7, the backflow prevention valve 830 is formed in a disc shape so that a hinge portion 831 protruding so as to be hinged to the valve seat 820 and a refrigerant passage hole 821 of the valve seat 820 can be opened and closed. And an opening / closing portion 832 formed on the surface. The backflow prevention valve 830 can be formed thinner as it goes from the hinge part 831 to the opening / closing part 832 side so that it can be opened quickly.

  Further, the backflow prevention valve 830 has a movable side hinge hole 833 formed at the center of the hinge portion 831 so as to coincide with the fixed side hinge hole 823 of the valve seat 820. Here, the movable-side hinge hole 833 is also formed at least on the same vertical line as the compression surface of the backflow prevention valve 830 or the discharge side so that the backflow prevention valve 830 closes smoothly not only by the pressure difference but also by its own weight. It is preferable to form so that it may be located in.

  Further, the backflow prevention valve 830 is inclined at a predetermined angle so that the outer peripheral surface of the hinge portion 831 contacts the valve seat 820 when the valve is opened to limit the opening angle of the backflow prevention valve 830, and the valve stop surface 834 is inclined. Or a valve stop protrusion (not shown) is formed on the compression back surface of the opening / closing portion 832 so as to contact the inner peripheral surface of the valve housing 810 and limit the opening angle of the backflow prevention valve 830 when the valve is opened. It is formed.

  The backflow prevention valve 830 can be formed of a thin metal plate in consideration of rigidity and elasticity, or can be formed of an engineer plastic material such as PEEK in consideration of noise, cost, and the like.

  On the other hand, as shown in FIG. 10, between the backflow prevention valve 830 and the valve seat 820, a torsional force is accumulated when the backflow prevention valve 830 is opened, and is elastically closed when the backflow prevention valve 830 is closed. An elastic member 850 such as a spring can also be installed. In this case, the closing speed of the backflow prevention valve 830 can be further increased to effectively prevent the backflow of the refrigerant.

  In the figure, reference numeral 310 denotes a stator, 320 denotes a rotor, 450 denotes a subframe, and 835 denotes a spring support protrusion.

  Hereinafter, the operation and effect of the backflow prevention device for the scroll compressor according to the present invention will be described.

  When power is supplied to the drive motor 300, the drive shaft 330 of the drive motor 300 is rotated, and the orbiting scroll 500 coupled to the drive shaft 330 is rotated by an eccentric distance while meshing with the fixed scroll 400. Between the fixed scroll 400 and the orbiting scroll 500, a pair of compression chambers P is formed in which the volume gradually decreases toward the center by moving continuously. In this process, after the refrigerant is sucked into the suction space 130 of the casing 100 through the suction pipe 110, it flows into the outermost compression chamber from the suction port 430 of the fixed scroll 400 and gradually moves to the final compression chamber side for compression. And discharged into the discharge space 140 of the casing 100. Thus, the refrigerant discharged into the discharge space 140 of the casing 100 pushes and opens the backflow prevention valve 830 provided on the inlet side of the valve housing 810 and moves from the refrigerant through hole 821 of the valve seat 820 to the discharge pipe 140. And discharged into the refrigeration cycle.

  Hereinafter, the process of opening and closing the backflow prevention valve 830 will be described in more detail.

  First, as shown in FIG. 8, when the compressor operates normally, the force due to the discharge pressure of the refrigerant applied to the compression surface of the backflow prevention valve 830 is the force due to the pressure applied to the compression back surface of the backflow prevention valve 830. Is greater than the combined force of the self-weight of the backflow prevention valve 830 and the backflow prevention valve 830 rotates upward about the hinge pin 840 to open, and the compressed refrigerant is discharged from the opened refrigerant through hole 821. It is quickly discharged into the tube 120. Here, a valve stop surface 834 is formed on the outer peripheral surface of the hinge portion 831 of the backflow prevention valve 830 at a predetermined inclination angle α, and the backflow prevention valve 830 is brought into contact with the compression back surface of the valve seat 820. The opening angle of is limited.

  On the other hand, as shown in FIG. 9, when the compressor performs an abnormal operation or stops, the force due to the pressure applied to the compression back surface of the backflow prevention valve 830 and the backflow prevention valve 830 are opposite to those during normal operation. The force combined with the force due to its own weight is larger than the force due to the discharge pressure of the refrigerant applied to the compression surface of the backflow prevention valve 830, and the backflow prevention valve 830 rotates downward about the hinge pin 840 quickly. close. Here, the backflow prevention valve 830 prevents the refrigerant discharged to the discharge pipe 120 from flowing back into the discharge space 140 of the casing 100 when the compression surface thereof is in line contact with the seal protrusion 824 of the valve seat 820. . In particular, as shown in FIG. 6, when an elastic ring 825 is installed on the valve seat 820, the discharge valve 830 is elastically buffered by the elastic ring 825 to prevent not only collision noise and valve breakage but also discharge. By making line contact with the valve 830, it is possible to effectively prevent the back flow of the refrigerant.

  In this way, the backflow prevention valve is hinged to the valve seat, so that the response speed is faster than that of the slide opening and closing. Especially when the backflow prevention valve is closed, both sides of the backflow prevention valve are The pressure difference and the self-weight of the backflow prevention valve act together to close more quickly, so that the backflow of the discharged refrigerant can be effectively prevented, and the efficiency of the scroll compressor is improved.

  Further, it is possible to reduce the valve collision noise when the backflow prevention valve is opened and closed, thereby reducing the discharge noise of the compressor. In particular, when the backflow prevention valve is opened, the valve stop surface can prevent the backflow prevention valve from hitting a structure, and when the backflow prevention valve is closed, the valve seat is provided with the elastic ring. As a result, the noise generated when the discharge valve hits the valve seat can be reduced, and the discharge noise of the compressor can be greatly reduced.

  Hereinafter, other embodiments of the backflow prevention device for a scroll compressor according to the present invention will be described.

  In the above-described embodiment, the backflow prevention valve 830 is configured by a hinge type valve. However, in this embodiment, the backflow prevention valve 861 is configured by a lead type valve, as shown in FIG.

  For this purpose, the backflow prevention valve 861 is formed of a thin metal plate having elasticity, and one end thereof is a fixed end fixedly coupled to the valve seat 820, and the other end is freely bent around the fixed end. It consists of a free end that moves to open and close the refrigerant passage hole 821 of the valve seat 820.

  In addition, the opening amount of the backflow prevention valve 861 can be limited by the elastic force of the backflow prevention valve 861 itself, or can be limited by the inner peripheral surface of the valve housing 810. A retainer 862 can also be placed and limited.

  Also in this case, the basic configuration of the backflow prevention device such as the valve housing 810 and the valve seat 820 and the function and effect thereof are the same as those of the above-described embodiment, and thus the description thereof is omitted. However, in the case of this embodiment, noise may occur due to collision with the retainer 862 or the like in the process of opening the backflow prevention valve 861, but by forming the retainer 862 with a curved surface so as to correspond to the shape of the valve, backflow is prevented. Valve collision noise when the prevention valve 861 is opened can be reduced.

  On the other hand, the installation position of the scroll compressor backflow prevention device can be changed as follows.

  That is, the valve housing 810 can be welded and joined through the casing 100 as shown in FIG. 12, or can be installed so as to be positioned on the outer surface of the casing 100 as shown in FIG. As shown in FIG. 14, it can be inserted and coupled to a discharge plenum 900 coupled to a fixed scroll 410.

  For example, as shown in FIG. 12, when the valve housing 810 penetrates the casing 100, the outer peripheral surface of the valve housing 810 penetrates the through hole 101 of the casing 100 and is welded. In this case, the backflow prevention device can be assembled even after the casing 100 is assembled.

  As shown in FIG. 13, when the valve housing 810 is installed on the outer surface of the casing 100, the valve seat portion 150 having the refrigerant passage hole 151 is integrally formed in the casing 100, and the upper side of the refrigerant passage hole 151. A hinge protrusion 152 is formed on the back of the backflow prevention valve 830, and the hinge 831 of the backflow prevention valve 830 is rotatably coupled. Further, the inlet of the valve housing 810 houses the backflow prevention valve 830 and is hermetically coupled to the outer surface of the casing 100, and the discharge pipe 120 is connected to the outlet of the valve housing 810. In this case, since it is not necessary to separately provide a valve seat for fixing the backflow prevention valve 830, the number of parts and the number of assembling steps can be reduced accordingly, thereby reducing the production cost and improving the productivity.

  On the other hand, as shown in FIG. 14, when the valve housing 810 is coupled to the discharge plenum 900 that forms the discharge space, the valve housing 810 is inserted and coupled so as to communicate with the through-hole 910 of the discharge plenum 900. A discharge pipe 120 connected to the outlet of the housing 810 is through-coupled to the casing 100 that is sealed to the outer shell of the discharge plenum 900. In this case, the entire internal space of the casing 100 excluding the discharge plenum 900 forms a low-pressure suction space, thereby reducing the pressure load received by the welded portion of the casing 100 and the discharge pipe 120 and increasing the sealing force. In addition, the discharge plenum 900 can serve as a silencer to further reduce compressor noise. Here, the valve housing 810 may be coupled so as to be in close contact with the inner wall surface of the discharge plenum 900.

  As described above, the low-pressure scroll compressor in which the internal space of the casing is partitioned into a suction space and a discharge space by a high-low pressure separator plate or a discharge plenum has been described as an example. A suction pipe 110 passes through the casing 100 and is directly coupled to the fixed scroll 400, the internal space of the casing 100 maintains the discharge space 140 of the high-pressure section, and the discharge pipe 120 communicates with the discharge space 140. It can be similarly applied to. That is, the same hinge-type or lead-type backflow prevention device 800 as that of the above-described embodiment is installed between the discharge space 140 and the discharge pipe 120 so as to open and close the discharge space 140 and the discharge pipe 120. Since the operation and effect are the same as those of the low-pressure scroll compressor described above, the description thereof is omitted.

It is a longitudinal cross-sectional view which shows a part of conventional scroll compressor. It is a longitudinal cross-sectional view which shows an example of the backflow prevention unit of FIG. It is a longitudinal cross-sectional view which shows the other example of the backflow prevention unit of FIG. It is a longitudinal cross-sectional view which shows a low-pressure-type scroll compressor provided with the backflow prevention apparatus by this invention. It is a disassembled perspective view which shows an example of the valve seat of the backflow prevention apparatus of FIG. It is a disassembled perspective view which shows the other example of the valve seat of the backflow prevention apparatus of FIG. It is a longitudinal cross-sectional view which shows the assembled state of the backflow prevention apparatus of FIG. It is a longitudinal cross-sectional view which shows the backflow prevention apparatus at the time of normal operation of the compressor of FIG. It is a longitudinal cross-sectional view which shows the backflow prevention apparatus at the time of the stop of the compressor of FIG. It is a longitudinal cross-sectional view which shows the example by which the elastic member was added to the backflow prevention valve | bulb of the backflow prevention apparatus of FIG. It is a longitudinal cross-sectional view which shows the backflow prevention valve of the backflow prevention apparatus by other embodiment of this invention. It is a longitudinal cross-sectional view which shows an example of the installation position of the backflow prevention apparatus by this invention. It is a longitudinal cross-sectional view which shows the other example of the installation position of the backflow prevention apparatus by this invention. It is a longitudinal cross-sectional view which shows the further another example of the installation position of the backflow prevention apparatus by this invention. It is a longitudinal cross-sectional view which shows a high-pressure-type scroll compressor provided with the backflow prevention apparatus by this invention.

Claims (23)

A valve housing installed between the inner space of the sealed casing and a discharge pipe communicating with the inner space;
A valve seat that is installed in the valve housing and has a refrigerant through hole formed so as to communicate the internal space of the casing and the discharge pipe;
A backflow prevention device for a compressor, comprising: a backflow prevention valve that is rotatably coupled to the valve seat and opens and closes a refrigerant passage hole of the valve seat.   The backflow prevention device for a compressor according to claim 1, wherein the valve housing is disposed in an inner space of the casing and is coupled to an inner peripheral surface of the casing.   3. The backflow prevention device for a compressor according to claim 2, wherein the valve housing is disposed in an internal space of the casing, and a connection portion with the discharge pipe is inserted into the casing and coupled thereto.   The apparatus for preventing a backflow of a compressor according to claim 1, wherein the valve housing is coupled through the wall surface of the casing.   2. The valve seat according to claim 1, wherein one end of the valve housing is coupled to an outer wall surface of the casing, and a valve seat is formed so that the backflow prevention valve is coupled to the outer wall surface of the casing. Compressor backflow prevention device.   The backflow prevention of the compressor according to claim 1, wherein a discharge plenum is installed in an inner space of the casing so as to accommodate a refrigerant to be discharged, and the valve housing is coupled to the discharge plenum. apparatus.   The backflow prevention valve has a hinge portion protruding so that one end thereof is hinged to the valve seat, and the other end is formed in a plate shape so as to open and close the refrigerant passage hole of the valve seat. The backflow prevention device for a compressor according to claim 1.   The backflow prevention device for a compressor according to claim 7, wherein the backflow prevention valve is disposed such that the hinge portion is positioned above the ground with respect to the opening / closing portion.   The backflow prevention valve has a movable side hinge hole, and the valve seat has a fixed side hinge hole to be coupled with a hinge pin corresponding to the movable side hinge hole of the backflow prevention valve. The backflow prevention device for a compressor according to claim 7.   The backflow prevention device for a compressor according to claim 7, wherein the backflow prevention valve is formed so as to be thinner from the hinge portion toward the opening / closing portion.   A valve stop surface is formed on the hinge-side compression back surface of the backflow prevention valve so as to come into contact with a fixed surface of the backflow prevention valve when opening to limit an opening angle of the backflow prevention valve. The backflow prevention device for a compressor according to claim 7.   A valve stop protrusion is formed on the open / close compression back surface of the backflow prevention valve so as to contact the inner peripheral surface of the valve housing when the backflow prevention valve is opened to limit an opening angle of the backflow prevention valve. The backflow prevention device for a compressor according to claim 7.   The center of the backflow prevention valve is located on the discharge side with respect to the refrigerant discharge direction relative to the compression surface of the backflow prevention valve, or at least the same position as the compression surface of the backflow prevention valve. The backflow prevention device for a compressor according to claim 7, wherein the backflow prevention device is formed as described above.   8. The backflow of the compressor according to claim 7, wherein the backflow prevention valve is provided with an elastic member so that the backflow prevention valve is restored when the backflow prevention valve is closed to apply elasticity to the backflow prevention valve. Prevention device.   The backflow prevention device for a compressor according to claim 14, wherein the elastic member includes a backflow prevention valve and a torsion spring supported at a portion where the backflow prevention valve is installed.   The buffer member having an elastic force is installed at a portion where the compression surface of the backflow prevention valve contacts when the backflow prevention valve is closed so that the amount of impact can be reduced. A backflow prevention device for a compressor according to claim 7.   2. The backflow prevention device for a compressor according to claim 1, wherein one end of the backflow prevention valve is fixedly coupled and the other end is bent and opened and closed. 3.   The backflow prevention device for a compressor according to claim 17, wherein a retainer is provided on a back surface of the backflow prevention valve so as to limit an opening amount of the backflow prevention valve.   The backflow prevention device for a compressor according to claim 1, wherein the valve seat is coupled to the valve housing by any one of press-fitting, welding, or bolting.   2. The backflow prevention device for a compressor according to claim 1, wherein the internal space of the casing is divided into a suction space that communicates with a suction pipe and a discharge space that communicates with the discharge pipe.   2. The backflow prevention device for a compressor according to claim 1, wherein an inner space of the casing is formed in the discharge space by being entirely filled with a refrigerant having a discharge pressure.   In the internal space of the casing, a compression chamber is formed by meshing a plurality of scrolls, and a compression unit that continuously compresses the refrigerant by reducing the volume by the continuous movement of the compression chamber is installed. The backflow prevention device for a compressor according to claim 1.   The backflow prevention device for a compressor according to claim 1, wherein the valve housing, the valve seat, the backflow prevention valve, and the discharge pipe are integrally coupled to the casing.

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