Fixed scroll and scroll compressor equipped therewith

Abstract

A scroll compressor is disclosed. The scroll compressor includes a fixed scroll. The fixed scroll includes an injection pipe through which refrigerant is injected and a check valve that prevents backflow of refrigerant. A compression chamber is provided inside the fixed scroll, and a communication hole connecting the injection pipe and the compression chamber is provided. A valve movement guide is further provided inside the fixed scroll. The valve movement guide guides the movement of the check valve. When the injection pipe is opened, the check valve can move a distance greater than or equal to the distance from one end of the injection pipe to the communication hole. Through this, the check valve opens without obstructing the flow of refrigerant, thereby minimizing flow path loss.

Description

Technology Field

[0001] The present invention relates to a fixed scroll with increased refrigerant injection volume and improved operability of an injection check valve, and a scroll compressor equipped with the same. Background Technology

[0002] An air conditioner is a home appliance that drives a refrigeration cycle performing the compression, condensation, expansion, and evaporation processes of a refrigerant, and maintains indoor air in a suitable state by operating for cooling or heating of an indoor space depending on the application and purpose.

[0003] Typically, the cooling or heating performance of an air conditioner may be limited when outdoor conditions are poor. For example, if the outdoor temperature in the area where the air conditioner is installed is very high or very low, a sufficient amount of refrigerant circulation must be ensured to achieve the desired cooling and heating performance. To this end, equipping the unit with a large-capacity compressor presents the problem of increased manufacturing and installation costs.

[0004] In light of this, in order to secure a sufficient amount of refrigerant circulation without increasing the capacity or size of the compressor, the amount of refrigerant compressed in the compressor can be increased by extracting high-pressure vaporized refrigerant from the outlet of the condenser constituting the refrigeration cycle and resupplying it to the compression chamber of the compressor. This is called an injection cycle.

[0005] In the prior art patent document US10190588 B2 (hereinafter referred to as 'Patent Document 1') related to the above injection cycle, a compressor equipped with a check valve in the injection passage is disclosed.

[0006] According to Patent Document 1, an injection pipe is installed on the side of a fixed scroll. A check valve is provided between the injection pipe and the compression chamber of the fixed scroll. The check valve is formed in the shape of a disc. The check valve has a central hole formed through the center.

[0007] A valve support member supporting the above check valve is installed at the end of the injection pipe. Multiple slits are spaced out in the circumferential direction along the edge of the valve support member.

[0008] The check valve operates based on the difference between the pressure in the compression chamber and the pressure of the refrigerant injected through the injection pipe.

[0009] When the refrigerant pressure in the injection pipe is higher than the pressure in the compression chamber, the check valve opens due to the refrigerant pressure transmitted through the slit. The refrigerant passing through the slit is injected into the compression chamber through the central hole of the check valve.

[0010] However, in the case of Patent Document 1, the check valve has a complex flow path structure, so there is a problem that the amount of refrigerant injected is reduced due to flow path resistance.

[0011] For example, when looking at the path of the refrigerant injected through the injection pipe, the refrigerant is resisted by the center of the valve support member positioned perpendicular to the direction of refrigerant flow, and the direction of refrigerant flow changes radially outward toward the slit (first flow direction change).

[0012] Next, the flow direction of the refrigerant changes along the longitudinal direction of the valve support to pass through the slit (second flow direction change). The refrigerant passing through the slit is resisted by the edge of the check valve, and its flow direction changes towards the radial inner side of the check valve (third flow direction change). Subsequently, the flow direction of the refrigerant changes along the longitudinal direction of the check valve from the central hole of the check valve to pass through the central hole of the check valve (fourth flow direction change). In this way, the flow resistance of the refrigerant increases significantly due to the four flow direction changes, which can significantly reduce the amount of refrigerant injected.

[0013] In addition, the check valve has a thin thickness, so jamming occurs on the inner surface of the fixed scroll that forms the movement path of the check valve during movement, which causes the operation of the check valve to become unstable.

[0014] In the prior art patent document US12038008 B2 (hereinafter referred to as 'Patent Document 2') related to the above injection cycle, a compressor equipped with an injection mechanism is disclosed.

[0015] According to Patent Document 2, a check valve is installed on the upper part of a fixed scroll. Inside the fixed scroll, a spray inlet passage, a spray communication passage, a check valve chamber, and a spray outlet passage are provided.

[0016] The injection inlet passage is connected to the injection pipe installed on the side of the fixed scroll. The injection communication passage connects the injection inlet passage to the check valve chamber. The check valve is housed in the check valve chamber. The check valve is configured to open and close the injection communication passage. The injection outlet passage is connected to the compression chamber.

[0017] Through this, the refrigerant injected through the injection pipe can move through the injection inlet path, injection connecting path, check valve, check valve chamber, injection outlet path, and compression chamber. The check valve is operated by the difference between the refrigerant pressure in the injection pipe and the pressure in the compression chamber.

[0018] However, the above-mentioned injection inlet passage extends in the radial direction, the above-mentioned injection connecting passage extends in the vertical direction, the above-mentioned check valve chamber extends in a direction inclined with respect to the radial direction, and the injection outlet passage extends in the vertical direction, respectively, so the structure of each passage is complex.

[0019] As a result, there is a problem in that the flow resistance increases, causing a decrease in the refrigerant flow rate injected into the compression chamber. The problem to be solved

[0020] The objective of the present invention is to provide a scroll compressor with a structure capable of solving the aforementioned problems.

[0021] The first objective is to provide a fixed scroll with a structure capable of minimizing the increase in flow resistance caused by the structure of a complex injection flow path, and a scroll compressor equipped with the same.

[0022] The second objective is to provide a fixed scroll with a structure capable of improving jamming during the operation of a check valve, and a scroll compressor equipped with the same.

[0023] The third objective is to provide a fixed scroll with a structure capable of preventing breakage of the spring during valve operation when the spring supporting the check valve is not fixed, and a scroll compressor equipped with the same.

[0024] The fourth objective is to provide a fixed scroll with a structure that can prevent delay in the operation of a check valve due to oil viscosity when a spring fixing member is added, and a scroll compressor equipped with the same.

[0025] The fifth objective is to provide a fixed scroll with a structure capable of maintaining airtightness between a check valve and an injection pipe, and a scroll compressor equipped with the same. means of solving the problem

[0026] As a result of intensive research, the inventors have found that the problem of the present invention or the first to fifth objectives described above can be achieved by the following embodiments of the present invention.

[0027] To achieve the above-mentioned objective, the fixed scroll according to the present invention includes a check valve movably provided to open and close an injection pipe. The check valve is actuated by a pressure difference between the injection pipe and the compression chamber. When the injection pipe is opened, the check valve moves in a direction away from the end of the injection pipe, but can move further than the communication hole communicating with the compression chamber so as not to obstruct the flow of refrigerant injected into the injection pipe.

[0028] In addition, the check valve can operate stably by widening the contact area with the valve movement guide forming the movement path of the check valve so that jamming does not occur during operation.

[0029] A fixed scroll according to one example comprises: a fixed end plate portion; a fixed side wall portion protruding from the outer periphery of the fixed end plate portion and forming a compression chamber together with the fixed end plate portion; a fixed wrap protruding inwardly from the fixed end plate portion to the fixed side wall portion; an injection pipe connected to the side of the fixed end plate portion in communication with the compression chamber and injecting a refrigerant into the compression chamber; a check valve movably installed inwardly within the fixed end plate portion to open and close the injection pipe; and a spring elastically supporting the check valve.

[0030] The check valve moves in a direction away from the injection pipe. The maximum travel distance of the check valve away from the injection pipe may be greater than or equal to the distance from the injection pipe to the communication hole communicating with the compression chamber.

[0031] Through this, the check valve can prevent backflow of the refrigerant while minimizing the flow resistance of the refrigerant injected through the injection pipe.

[0032] According to one example, the fixed scroll may further include a pipe receiving portion that extends in one direction from the side of the fixed end plate portion and accommodates the injection pipe; and a valve moving guide that extends further in one direction from the inner side of the fixed end plate portion and allows the movement of the check valve. The communication hole may be formed to penetrate from the valve moving guide to the compression chamber.

[0033] Through this, the valve movement guide is connected to the pipe receiving portion and the communication hole, and can stably guide the movement of the check valve.

[0034] According to one example, the check valve can reciprocate between a first point and a second point. The first point may be located upstream of the communication hole based on the flow direction of the refrigerant injected through the injection pipe when the check valve is opened. The second point may be located downstream of the communication hole.

[0035] Through this, the check valve can be in close contact with the injection pipe when closed with the communication hole in between, or when opened, pass through the communication hole with respect to the refrigerant flow direction and directly switch the refrigerant flow direction to the communication hole without obstructing the flow of the refrigerant.

[0036] According to one example, the check valve can be formed in a cylindrical shape.

[0037] Through this, the check valve can minimize the flow resistance of the refrigerant.

[0038] According to one example, the check valve may be in surface contact with the inner surface of the pipe receiving portion in which the injection pipe is received.

[0039] Through this, the check valve can prevent jamming during operation.

[0040] According to one example, the check valve may have a diameter greater than or equal to the diameter of the injection pipe; and a length greater than or equal to the diameter of the communication hole.

[0041] Through this, the check valve can operate smoothly without jamming in the communication hole.

[0042] According to one example, the communication hole may be formed to extend in a direction intersecting the extension direction of the injection pipe. The check valve may pass through one side of the communication hole at least once when the injection pipe is opened or closed.

[0043] Through this, the check valve can pass upstream of the connecting hole with respect to the refrigerant flow direction during the opening operation without obstructing the flow of refrigerant.

[0044] According to one example, the check valve may include a valve body disposed to be in contact with the end of the injection pipe; and a valve side wall formed to protrude in the opposite direction to the injection pipe from the valve body.

[0045] Through this, the valve body can block the flow of refrigerant or induce a change in direction. The valve side wall is supported by the valve body and can increase the contact area with the valve movement guide.

[0046] According to one example, the valve body may have a diameter greater than or equal to the diameter of the injection pipe. The valve side wall may have a length greater than or equal to the diameter of the communication hole.

[0047] Through this, the valve body can prevent backflow of the refrigerant. The valve side wall can maintain smooth operation of the check valve.

[0048] According to one example, the check valve is guided to move in the extension direction along a valve movement guide extending in the extension direction of the injection pipe from the inner side of the fixed end plate, and when the injection pipe is opened, it moves in a direction away from the injection pipe so as to open the communication hole as well.

[0049] Through this, the check valve can redirect and directly move the refrigerant passing through the injection pipe to the communication hole.

[0050] According to one example, the check valve is actuated by the pressure difference between the injection pipe and the compression chamber. The check valve may be positioned between the end of the injection pipe and the communication hole when the injection pipe is closed.

[0051] Through this, the check valve can prevent backflow of refrigerant.

[0052] According to one example, the spring may be compressed by the pressure of the injection pipe when the check valve is opened. When the check valve is closed, it may be stretched back to its original position by the pressure of the compression chamber.

[0053] According to one example, the spring may be a coil spring.

[0054] According to one example, one end of the spring is connected to the check valve, and the other end of the spring can be coupled to the inside of the fixed end plate.

[0055] Through this, the operation of the above spring can be performed stably.

[0056] According to one example, the spring may further include a spring fixing part extending from one end of the spring in a direction intersecting the longitudinal direction of the spring.

[0057] The above spring fixing part can be coupled to the inner side of the above fixed end plate part.

[0058] Through this, the spring fixing part can easily fix the spring.

[0059] According to one example, the spring fixing part may be formed as a plate in one of the shapes of a circle, polygon, ellipse, or arc. A spring coupling part may be formed recessed on the inner side of the fixed end plate part so as to accommodate and connect the spring fixing part.

[0060] Through this, the spring fixing part can be implemented in various embodiments.

[0061] According to one example, the spring fixing part for fixing the spring may include a spring fixing body that extends in a direction intersecting the longitudinal direction of the spring and is connected to one end of the spring; and a spring fixing side wall part formed to protrude toward the check valve from the outer circumference of the spring fixing body.

[0062] Through this, the spring fixing part is implemented as a piston type, so that the spring can be stably supported.

[0063] According to one example, the check valve may include a valve body that extends in a direction intersecting the longitudinal direction of the spring and is connected to one end of the spring; and a valve side wall portion that protrudes in the longitudinal direction of the spring from the outer circumference of the valve body.

[0064] Through this, the above check valve can be implemented as a piston type.

[0065] A spring fixing part for fixing the spring may include a spring fixing body that extends in a direction intersecting the longitudinal direction of the spring and is connected to the other end of the spring; and a spring fixing side wall part that protrudes in the longitudinal direction of the spring from the outer periphery of the spring fixing body.

[0066] A chamfer portion may be formed at one end of at least one of the valve side wall portion and the spring fixing side wall portion.

[0067] Through this, the chamfer portion forms a gap between the valve side wall portion and the spring fixing portion when the check valve is opened, thereby preventing delay in operation caused by the viscosity of the oil.

[0068] According to one example, a pipe joint portion into which the injection pipe is inserted and joined; and

[0069] It may further include a valve seat provided at the end of the pipe joint and in close contact with the check valve when the check valve is closed.

[0070] Through this, the valve seat can maintain airtightness between the check valve and the injection pipe.

[0071] A scroll compressor according to one example of the present invention may include: a casing; a drive motor having a stator coupled to the inner circumference of the casing and a rotor rotatably disposed with an air gap inside the stator; a main frame disposed on one side of the drive motor; a pivot scroll; a compression unit having a fixed scroll coupled to engage with the pivot scroll and forming a compression chamber together with the pivot scroll; and a rotating shaft that transmits rotational force from the drive motor to the compression unit.

[0072] The above fixed scroll may include: a fixed end plate portion; a fixed side wall portion protruding from the outer periphery of the fixed end plate portion and forming a compression chamber together with the fixed end plate portion; an injection pipe connected to the side of the fixed end plate portion in communication with the compression chamber and injecting refrigerant into the compression chamber; and a check valve movably installed inside the fixed end plate portion to open and close the injection pipe.

[0073] The maximum travel distance of the check valve moving away from the injection pipe may be greater than or equal to the distance from the injection pipe to the communication hole communicating with the compression chamber.

[0074] Through this, the check valve can reduce refrigerant flow loss and maintain smooth operation without jamming during operation. Effects of the invention

[0075] According to an embodiment of the present invention, the following effects can be achieved.

[0076] First, a valve movement guide may be provided between the injection pipe and the compression chamber. The valve movement guide may extend radially inside the fixed end plate portion of the fixed scroll. A check valve may be mounted so as to be radially movable on the valve movement guide.

[0077] A communication hole is formed to penetrate axially between the valve moving guide and the compression chamber. The communication hole can connect the valve moving guide and the compression chamber so as to enable communication.

[0078] The check valve can reciprocate between the first and second points along the valve movement guide. The first point is located adjacent to the end of the injection pipe. The second point is located downstream of the inlet of the communication hole with respect to the refrigerant flow direction.

[0079] The check valve is operated by the difference between the refrigerant pressure in the injection pipe and the pressure in the compression chamber. When the pressure in the compression chamber is higher than or equal to the injection pressure, the check valve moves to the first point and closes the injection pipe, thereby preventing the backflow of refrigerant.

[0080] Second, the check valve is formed as a piston type, which can increase the contact area with the inner surface of the valve movement guide. Through this, the check valve can minimize jamming while moving along the valve movement guide. The check valve can operate stably.

[0081] Third, a spring can be installed between the check valve and the end of the valve movement guide. The check valve can be elastically supported by the spring.

[0082] If the refrigerant pressure in the injection pipe is higher than the pressure in the compression chamber, the refrigerant injected through the injection pipe can overcome the elastic force of the spring and move the check valve from the first point to the second point.

[0083] The check valve can open the injection pipe. Refrigerant can be injected into the compression chamber through the injection pipe, valve moving guide, and connecting hole.

[0084] Through this, the spring can prevent the occurrence of chatter noise when the check valve is closed.

[0085] Fourth, the maximum travel distance of the check valve that can move along the valve travel guide when the injection pipe is opened is greater than or equal to the maximum clearance distance of the communication hole from the end of the injection pipe.

[0086] Through this, the check valve is positioned outside the path of the refrigerant when the injection pipe is opened, so as not to obstruct the flow of the refrigerant. The check valve directs the flow of the refrigerant to the compression chamber only once at the second point.

[0087] Therefore, the check valve can minimize flow path loss when injecting refrigerant through the injection pipe. By reducing flow path resistance, the check valve can maximize the injection effect without reducing the injection flow rate.

[0088] Fifth, a chamfer can be formed at an angle on one corner of the check valve. By inducing the flow of oil to minimize friction of the check valve on the inner surface of the fixed scroll, the chamfer can prevent delay in the operation of the check valve caused by the viscosity of the oil.

[0089] Sixth, a spring fixing part can be formed in various shapes at one end of the spring. The spring fixing part can be formed in various shapes, such as a disc, polygon, or piston type.

[0090] Through this, the spring fixing part can minimize the up-and-down movement of the spring during the operation of the check valve. Therefore, the spring fixing part can prevent damage to the spring caused by up-and-down movement when the spring is not fixed. Brief explanation of the drawing

[0091] FIG. 1 is a conceptual diagram showing an injection cycle device mounted on a scroll compressor according to an embodiment of the present invention. FIG. 2 is a conceptual diagram showing the operating state of an injection cycle device according to an embodiment of FIG. 1. FIG. 3 is a conceptual diagram showing the operating state of an injection cycle device according to another embodiment of the present invention. FIG. 4 is a conceptual diagram showing the operating state of an injection cycle device according to another embodiment of the present invention. FIG. 5 is a conceptual diagram showing the structure of a check valve according to another embodiment of the present invention. FIG. 6 is a conceptual diagram showing the operating state of an injection cycle device according to another embodiment of the present invention. Specific details for implementing the invention

[0092] Hereinafter, a scroll compressor according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

[0093] In the following description, descriptions of some components may be omitted to clarify the features of the present invention.

[0094] 1. Definition of Terms

[0095] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0096] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0097] As used in this specification, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0098] In the following description, “radial” or “radial” refers to a shape extending outward from a central point like spokes of a wheel.

[0099] In the following description, “axial direction” refers to the longitudinal direction of the axis of rotation.

[0100] In the following description, the term “radial direction” refers to the longitudinal direction of a line segment extending from the center of a circle or cylinder to a point on the circumference.

[0101] In the following description, “circumferential direction” refers to the direction of the circumference.

[0102] 2. Description of the configuration of a scroll compressor according to an embodiment of the present invention

[0103] FIG. 1 is a cross-sectional view illustrating the components of a scroll compressor according to one embodiment of the present invention.

[0104] Hereinafter, each configuration of a scroll compressor according to an embodiment of the present invention will be described with reference to the attached drawings.

[0105] The scroll compressor may include a casing (100), a drive motor (110), and a compression unit (120). However, the injection cycle device to be described later will be explained separately in a separate section.

[0106] (1) Components of a scroll compressor

[0107] FIG. 1 is a conceptual diagram showing the configuration of a scroll compressor according to an embodiment of the present invention.

[0108] The scroll compressor according to the present invention can be applied to an upper compression type scroll compressor or a lower compression type scroll compressor. The scroll compressor according to the present embodiment is shown applied to a lower compression type.

[0109] The scroll compressor described above includes a casing (100). The casing (100) forms the exterior or shape of the compressor. A receiving space is provided inside the casing (100) to accommodate components constituting the compressor.

[0110] A drive motor (110) is installed inside the casing (100). The drive motor (110) constitutes an electric motor. A compression unit (120) is installed on the lower side of the drive motor (110).

[0111] The electric motor is coupled to one side of the rotating shaft (117). The compression unit (120) is coupled to the other side of the rotating shaft (117). Through this, the compression unit (120) is connected to the electric motor via the rotating shaft (117) and can operate by receiving rotational force from the electric motor.

[0112] The casing (100) includes a cylindrical shell (101), an upper shell (102), and a lower shell (103).

[0113] The cylindrical shell (101) can be formed in a cylindrical shape. Both ends of the cylindrical shell (101) can be opened in the vertical direction. A driving motor (110) and a main frame (121) can be inserted and fixed to the inner circumference of the cylindrical shell (101).

[0114] The upper shell (102) can be press-fitted to the upper part of the cylindrical shell (101). The upper shell (102) can form an upper space (1021) on the upper part of the casing (100) together with the cylindrical shell (101). The upper space (1021) is a sealed space and can temporarily store compressed refrigerant discharged from the compression unit (120) to be described later.

[0115] Oil and compressed refrigerant may be mixed in the upper space (1021) above. The oil and compressed refrigerant may be separated from each other due to differences in specific gravity. The oil, which has a relatively higher specific gravity, may pass through the drive motor (110) and the compression section (120) and move to the lower space (1031) of the casing (100).

[0116] A terminal bracket may be attached to the upper part of the upper shell (102). A terminal may be connected through the terminal bracket. The terminal is configured to apply external power to the drive motor (110).

[0117] A discharge pipe (104) may be connected to one side of the upper part of the upper shell (102) so as to pass through it. The inner end of the discharge pipe (104) may be connected to communicate with the upper space (1021) of the casing (100). The outer end of the discharge pipe (104) may be connected to a condenser. The discharge pipe (104) may be positioned higher than the drive motor (110).

[0118] Through this, the discharge pipe (104) can discharge the compressed refrigerant in the upper space (1021) of the casing (100) to the outside.

[0119] A suction pipe (134) is connected to one side of the cylindrical shell (101) to communicate with the compression chamber of the compression unit (120) to be described later.

[0120] The lower shell (103) can be press-fitted to the bottom of the cylindrical shell (101). By doing so, the lower space (1031) of the casing (100) is sealed to form an oil storage space.

[0121] The drive motor (110) is installed on the upper part of the cylindrical shell (101). The drive motor (110) includes a stator (111) and a rotor (114).

[0122] The stator (111) includes a stator core (112) and a stator coil (113). The stator core (112) may be formed in a cylindrical shape. The stator core (112) may be pressed into and coupled to the inner surface of the cylindrical shell (101).

[0123] The stator core (112) includes a plurality of teeth and slots. The teeth are formed to protrude radially toward the center from the inner surface of the stator core (112). The plurality of teeth are spaced apart at equal intervals in the circumferential direction of the stator core (112).

[0124] A slot may be formed between two adjacent teeth in the circumferential direction. Multiple teeth and multiple slots are arranged alternately along the circumferential direction. The slot is formed to penetrate the axial direction of the stator core (112).

[0125] The stator coil (113) is wound onto the stator core (112) through a slot. The stator coil (113) is electrically connected to an external power source through a terminal so that the external power source can be applied to the stator coil (113).

[0126] An insulator may be installed to provide electrical insulation between the stator core (112) and the stator coil (113). The insulator may include a first insulator (1131) and a second insulator (1132).

[0127] The first insulator (1131) can be inserted and coupled to one axial side of the stator core (112) through a slot. The second insulator (1132) can be inserted and coupled to the other axial side of the stator core (112) through a slot.

[0128] The rotor (114) includes a rotor core (115) and a permanent magnet (116). The rotor core (115) may be formed in a cylindrical shape. The rotor core (115) is rotatably installed inside the stator core (112) with a predetermined air gap.

[0129] The permanent magnets (116) can be mounted so as to be embedded inside the rotor core (115). The permanent magnets (116) can be spaced apart at predetermined intervals along the circumferential direction of the rotor core (115).

[0130] A rotating shaft (117) can be press-fitted and coupled to the center of the rotor core (115). A rotating scroll (126), to be described later, can be eccentrically coupled to the lower part of the rotating shaft (117). Through this, the rotational force of the drive motor (110) can be transmitted to the rotating scroll (126) through the rotating shaft (117).

[0131] The rotation shaft (117) is formed to be long in the axial direction. One end of the rotation shaft (117) is connected to a drive motor (110), and the other end of the rotation shaft (117) can be connected to a compression part (120).

[0132] For example, the upper part of the rotation shaft (117) is coupled to be fixed to the rotor (114), and the lower part of the rotation shaft (117) can be inserted rotatably by passing through the main frame (121), the pivot scroll (126), and the fixed scroll (130) in sequence, which will be described later.

[0133] An eccentric portion (119) is eccentrically formed at the lower part of the rotation axis (117). The eccentric portion (119) can be eccentrically coupled to the rotation axis coupling portion (129) of the pivot scroll (126).

[0134] Through this, the rotating scroll (126) can rotate around the axis of rotation (117).

[0135] One side and the other side of the rotation axis (117) in the axial direction can be supported by a first bearing provided at the center of the main frame (121) and a second bearing provided at the center of the fixed scroll (130), respectively, with respect to the pivot scroll (126).

[0136] An oil pickup (118) may be installed at the bottom of the rotating shaft (117). The oil pickup (118) is positioned to be submerged in oil stored in the lower part of the casing (100). The oil pickup (118) may be formed in the shape of a tube.

[0137] The oil pickup is configured to suck in oil and move it to the upper part of the rotating shaft (117). An oil supply channel is formed to penetrate axially inside the rotating shaft (117).

[0138] The oil pickup may be surrounded by a blocking member. The blocking member may be coupled to a discharge cover to be described later. The blocking member is configured to accommodate the oil pickup and prevent the intrusion of foreign substances.

[0139] The compression unit (120) may include a main frame (121), a pivot scroll (126), a fixed scroll (130), and a discharge cover (138). For example, the fixed scroll (130) may be provided on the lower side of the main frame (121), and the pivot scroll (126) may be axially supported by the fixed scroll (130) and pivotably provided between the main frame (121) and the fixed scroll (130).

[0140] The main frame (121) may include a frame plate section (122), a frame side wall section (124), and a main bearing section (123).

[0141] The frame end plate (122) is formed in an annular shape and can be fixedly coupled to the inner circumference of the casing (100) at the lower side of the drive motor (110). For example, the frame end plate (122) can be fixed to the inner circumference of the cylindrical shell (101) by hot press fitting or by welding.

[0142] The frame side wall portion (124) may be formed in a cylindrical shape. The frame side wall portion (124) may be formed to protrude axially from the outer periphery of the frame plate portion (122) toward the fixed scroll (130) to be described later.

[0143] A plurality of first connection holes (1241) may be formed in the frame side wall portion (124). The plurality of first connection holes (1241) may be formed to penetrate in the axial direction. A recess portion (1242) may be formed in the frame end plate portion (122). The recess portion (1242) may be formed to be recessed on one axial surface of the frame end plate portion (122) to accommodate the plurality of first connection holes (1241).

[0144] The recess (1242) is connected to the flow separation unit (150), which will be described later, through the first connecting hole (1241), so as to guide the refrigerant discharged through the first connecting hole (1241) to move into the inside of the flow separation unit (150).

[0145] The Euro separation unit (150) may be positioned between the drive motor (110) and the main frame (121). The Euro separation unit (150) may include a first Euro guide (151), a second Euro guide (152), and a guide connection part (153). The first Euro guide (151) may be formed in the shape of a circular ring.

[0146] The first Euro guide (151) can extend toward the drive motor (110) from one axial surface of the frame plate portion (122). One axial end of the first Euro guide (151) can be joined by contacting one axial surface of the frame plate portion (122).

[0147] The axial end of the first Euro guide (151) can be connected to one axial surface of the stator core (112). One side of the first Euro guide (151) can be connected to a second insulator (1132) located on the lower side of the stator core (112).

[0148] The second Euro guide (152) may be provided on the inner side of the first Euro guide (151). The second Euro guide (152) may be formed in the shape of a circular ring with a smaller diameter than the first Euro guide (151). The second Euro guide (152) may extend toward the drive motor (110) from one axial side of the frame.

[0149] One axial end of the second Euro guide (152) can be joined by contacting one axial surface of the frame plate portion (122). One side of the second Euro guide (152) can be spaced apart from the lower surface of the stator core (112).

[0150] The guide connecting portion (153) may extend radially between the first Euro guide (151) and the second Euro guide (152). The guide connecting portion (153) is configured to connect one axial end of the first Euro guide (151) and one axial end of the second Euro guide (152). The guide connecting portion (153) may be formed in the shape of a disc.

[0151] The guide connection part (153) is provided with a guide hole (154). The guide hole (154) is formed to penetrate so as to communicate with the first connection hole (1241) described above.

[0152] A refrigerant passage may be formed between the first Euro guide (151) and the second Euro guide (152). The refrigerant passage may be connected to communicate with the air gap between the stator (111) and the rotor (114).

[0153] Through this, the refrigerant passing through the first connection hole (1241) moves to the refrigerant flow path through the guide hole (154), and the refrigerant can pass through the drive motor (110) through the gap and move to the upper space (1021) of the casing (100).

[0154] An oil connection channel may be formed between the inner surface of the cylindrical shell (101) and the outer surface of the first oil guide (151). The upper side of the oil connection channel may be connected to communicate with the first oil groove (1121) formed between the inner surface of the cylindrical shell (101) and the outer surface of the drive motor (110), which will be described later. The lower side of the oil connection channel may be connected to communicate with the second oil groove (1321) formed between the inner surface of the cylindrical shell (101) and the outer surface of the compression part (120), which will be described later.

[0155] Through this, the oil separated in the upper space (1021) of the casing (100) can be moved to the lower space (1031) of the casing (100) and stored by passing through the first oil groove (1121), the oil passage of the oil separation unit (150), and the second oil groove (1321).

[0156] The main bearing portion (123) may protrude from the center of the frame plate portion (122) toward the drive motor (110) by a predetermined height. A main bearing hole, into which a rotation shaft (117) is rotatably inserted, may be formed through the center of the main bearing portion (123) in the axial direction.

[0157] Accordingly, the inner surface of the main bearing hole can support the rotating shaft (117) radially by forming a main bearing surface together with the main bearing surface of the rotating shaft (117) facing it. A bushing bearing (not shown) can be pressed into the inner surface of the main bearing hole so that the bushing bearing forms the actual main bearing surface.

[0158] The pivot scroll (126) is coupled to the rotation axis (117). The pivot scroll (126) is positioned between the main frame (121) and the fixed scroll (130). An Oldham ring (125), which is an anti-rotation mechanism, is provided between the main frame (121) and the pivot scroll (126). Through this, the pivot scroll (126) is restricted from rotating and can pivot relative to the fixed scroll (130).

[0159] The rotating scroll (126) may be configured to include a rotating plate section (127), a rotating wrap (128), and a rotating shaft coupling section (129).

[0160] The rotating plate portion (127) can be formed in the shape of a disc. The upper surface of the rotating plate portion (127) can be axially supported on the main frame (121).

[0161] An intermediate pressure chamber may be formed at the edge of the rotating plate section (127), that is, on the outer surface of the rotating plate section (127), together with the main frame (121) and the fixed scroll (130). The intermediate pressure chamber is connected to the compression chamber through an intermediate pressure passage to form an intermediate pressure (back pressure). Accordingly, the rotating plate section (127) receives the back pressure of the intermediate pressure chamber and is axially supported toward the fixed scroll (130), thereby suppressing leakage between the compression chambers.

[0162] The pivot wrap (128) can be formed in an involute shape. However, the pivot wrap (128) can be formed in various shapes other than an involute together with the fixed wrap (135). For example, the pivot wrap (128) may have a shape formed by connecting multiple arcs with different diameters and origins, and the outermost curve may be formed in a roughly elliptical shape having a major axis and a minor axis. The fixed wrap (135) may be formed in the same way.

[0163] The rotational shaft coupling portion (129) can be formed to penetrate axially at the inner end of the pivoting wrap (128), that is, at the central portion of the pivoting plate portion (127). Accordingly, the discharge hole (139), which will be described later, can be formed at the center of the pivoting scroll (126), that is, at an eccentric position from the rotational shaft coupling portion (129).

[0164] A rotating shaft (117) can be rotatably inserted and coupled to the rotating shaft coupling part (129). Accordingly, the outer periphery of the rotating shaft coupling part (129) is connected to the pivoting wrap (128) to form a first compression chamber (141a) together with the fixed wrap (135) during the compression process.

[0165] The pivoting wrap (128) is configured to pivot by engaging with the fixed wrap (135) of the fixed scroll (130) to be described later.

[0166] The pivoting wrap (128) can be coupled with the fixed wrap (135) described later to form a first compression chamber (141a) and a second compression chamber (141b).

[0167] The compression chamber (141) may be composed of a first compression chamber (141a) and a second compression chamber (141b) based on the swivel wrap (128). The first compression chamber (141a) and the second compression chamber (141b) may each consist of an intake pressure chamber, an intermediate pressure chamber, and a discharge pressure chamber. The intake pressure chamber, the intermediate pressure chamber, and the discharge pressure chamber are formed continuously from the outer edge of the fixed scroll (130) toward the center of the fixed scroll (130).

[0168] The first compression chamber (141a) refers to a compression chamber formed between the outer surface of the pivoting wrap (128) and the inner surface of the fixed wrap (135) facing it.

[0169] The second compression chamber (141b) refers to a compression chamber formed between the inner surface of the pivoting wrap (128) and the outer surface of the fixed wrap (135) facing it.

[0170] The fixed scroll (130) is positioned at the bottom of the main frame (121) with the rotating scroll (126) in between.

[0171] The fixed scroll (130) may include at least one of a fixed plate portion (131), a fixed bearing portion (136), a fixed side wall portion (132), and a fixed wrap (135).

[0172] The fixed plate section (131) may be formed in the shape of a disc. The fixed plate section (131) may be positioned at a predetermined interval on the lower side of the frame plate section (122). A plurality of fastening holes may be formed to penetrate axially through the edge of the fixed plate section (131).

[0173] A plurality of fastening grooves may be formed to penetrate axially along the edge of the frame plate portion (122). Fastening members, such as screws, may be fastened to the fixed plate portion (131) and the frame plate portion (122) through the fastening holes and fastening grooves. Through this, the fixed scroll (130) may be coupled to the main frame (121) by means of the fastening members.

[0174] The above fastening hole can be formed to penetrate axially into the fixed side wall portion (132) to be described later.

[0175] A fixed bearing hole may be formed through the center of the fixed plate portion (131) in the vertical direction.

[0176] The fixed bearing portion (136) may protrude from the back surface of the fixed end plate portion (131) toward the discharge cover (138) to be described later by a predetermined height. A fixed bearing hole, into which a rotation shaft (117) is rotatably inserted, may be formed through the center of the fixed bearing portion (136) in the axial direction.

[0177] The fixed bearing portion (136) can form a part of the fixed end plate portion (131). The diameter of the fixed bearing portion (136) can be formed to be smaller than the diameter of the fixed end plate portion (131).

[0178] Accordingly, the inner surface of the fixed bearing hole can support the rotating shaft (117) in the radial direction by forming a fixed bearing surface together with the fixed bearing part (136) of the rotating shaft (117) facing it.

[0179] A bushing bearing can be press-fitted into the inner surface of the fixed bearing hole. The inner surface of the bushing bearing can form a substantial fixed bearing surface. The second bearing described above can be implemented as a bushing bearing.

[0180] A plurality of discharge holes (139) may be formed around the fixed bearing hole. The discharge holes (139) may be formed at an eccentric position from the center of the fixed plate portion (131). The plurality of discharge holes (139) may include a first discharge hole and a second discharge hole. The first discharge hole may be connected to communicate with the first compression chamber (141a). The second discharge hole may be connected to communicate with the second compression chamber (141b).

[0181] The discharge hole (139) may be formed to communicate with the discharge pressure chambers of the first and second compression chambers (141a, 141b). The first and second compression chambers (141a, 141b) are formed on the inner and outer sides of the fixing wrap (135).

[0182] The discharge hole (139) can be opened and closed by a discharge valve (1391). The discharge valve (1391) can be implemented as an elastic rectangular plate spring. The discharge valve (1391) can open and close the discharge hole (139) by bending according to the discharge pressure of the refrigerant.

[0183] A plurality of bypass holes (140) may be provided in the fixed end plate portion (131). The bypass holes (140) may be formed to penetrate axially through the fixed end plate portion (131) and the fixed bearing portion (136). Two or three bypass holes (140) may form a set and may be arranged adjacent to the inner and outer surfaces, respectively, in the radial direction of the fixed wrap (135). In this embodiment, two bypass holes (140) are shown forming a set.

[0184] A set of bypass holes (140) can be opened and closed simultaneously by a bypass valve.

[0185] A fastening groove for fastening a bypass valve can be formed on the back surface of the fixed bearing part (136) in correspondence with the number of bypass valves.

[0186] The bypass hole (140) can be selectively opened by the bypass valve when excessive pressure occurs in the compression chamber (141) during operation. For example, when the liquid refrigerant is not evaporated by the heat of compression, excessive pressure may occur in the compression chamber (141), and the bypass valve can open the bypass hole (140) due to the excessive pressure.

[0187] The fixed side wall portion (132) may be formed in a cylindrical shape. The fixed side wall portion (132) may protrude upward from the outer periphery of the fixed end plate portion (131). The fixed side wall portion (132) may extend circumferentially along the circumference of the fixed end plate portion (131).

[0188] The upper part of the fixed side wall (132) can be connected to the main frame (121).

[0189] A suction port (133) is provided on one side of the fixed side wall (132). The suction port (133) may be formed to penetrate radially on one side of the fixed side wall (132). A suction pipe (134) may be inserted into and connected to the suction port (133).

[0190] One end of the suction pipe (134) is connected to the compression chamber (141) through the suction port (133). The other end of the suction pipe (134) passes through the cylindrical shell (101) and is connected to the evaporator (not shown) of the refrigeration cycle.

[0191] Accordingly, the refrigerant passing through the evaporator (not shown) of the refrigeration cycle can be directly sucked into the compression chamber (141). The internal space of the casing (100) can be filled with the refrigerant discharged from the compression chamber (141) to form a high-pressure scroll compressor.

[0192] A plurality of second connecting holes (142) may be formed to penetrate the outer periphery and the fixed side wall (132) of the fixed plate portion (131). The plurality of second connecting holes (142) may be arranged in pairs of an even number and spaced apart in the circumferential direction.

[0193] The upper portion of the second connecting hole (142) can be connected to the first connecting hole (1241) formed at the edge of the main frame (121). The lower portion of the second connecting hole (142) can be connected to the muffler space (1381) of the discharge cover (138) to be described later. Through this, the compressed refrigerant discharged through the discharge hole (139) can move toward the discharge pipe (104) of the upper shell (102) by passing through the second connecting hole (142) of the fixed scroll (130) and the first connecting hole (1241) of the main frame (121) in sequence from the muffler space (1381) of the discharge cover (138).

[0194] A plurality of second oil grooves (1321) may be formed on the outer surface of the fixed side wall portion (132). The second oil grooves (1321) may be formed to penetrate the fixed side wall portion (132) in the axial direction. The second oil grooves (1321) may be formed in the shape of semicircular grooves. The second oil grooves (1321) may be formed to be recessed radially toward the center of the fixed end plate portion (131).

[0195] A plurality of second oil grooves (1321) may be arranged circumferentially spaced apart along the outer surface of the fixed side wall (132).

[0196] Through this, the second oil groove (1321) can serve as a passage to move oil in the internal space of the casing (100) to the lower space (1031) of the casing (100).

[0197] The fixed wrap (135) may protrude axially toward the pivot scroll (126) from the upper surface of the fixed plate portion (131). The fixed wrap (135) may extend along a spiral direction toward the center of the fixed plate portion (131) from one side of the inner circumference of the fixed side wall portion (132).

[0198] The fixed wrap (135) can be coupled with the pivot wrap (128) to form a compression chamber (141). A first compression chamber (141a) may be formed between the inner surface of the fixed wrap (135) and the outer surface of the pivot wrap (128), and a second compression chamber (141b) may be formed between the outer surface of the fixed wrap (135) and the inner surface of the pivot wrap (128).

[0199] Since the fixed wrap (135) is formed to correspond to the shape of the aforementioned rotating wrap (128), a redundant description is omitted.

[0200] Through this, the rotating scroll (126) rotates relative to the fixed scroll (130), thereby compressing the refrigerant sucked in through the suction port.

[0201] The discharge cover (138) can be attached to the back surface of the fixed scroll (130). Here, the back surface of the fixed scroll (130) refers to the lower surface of the fixed scroll (130) based on FIG. 1.

[0202] A muffler space (1381) is provided inside the discharge cover (138). The muffler space (1381) can be connected to a discharge hole (139) that penetrates the fixed scroll (130).

[0203] Accordingly, the refrigerant discharged from the compression chamber (141) through the discharge hole (139) passes through the muffler space (1381) and moves to the upper space (1021) of the casing (100) through the second connection hole (142) and the first connection hole (1241) described above.

[0204] The discharge cover (138) can be coupled to the fixed end plate (131) to surround the outer surface of the fixed bearing part (136). Through this, the discharge cover (138) can separate the oil moving to the lower space (1031) of the casing (100) through the second oil groove (1321) from the discharge gas discharged through the discharge hole (139).

[0205] (2) Description of the configuration of an injection cycle device (160) according to one embodiment

[0206] FIG. 2 is a conceptual diagram showing the operating state of an injection cycle device (160) according to an embodiment in FIG. 1.

[0207] The fixed scroll (130) may further include an injection cycle device (160).

[0208] The injection cycle device (160) may be configured to include an injection pipe (161) and a check valve (165).

[0209] An injection pipe (161) can be installed on the side of a fixed scroll (130). One end of the injection pipe (161) can be connected to a condenser (not shown). The other end of the injection pipe (161) can be connected to the compression chamber (141) of a compressor.

[0210] Through this, the refrigerant condensed in the condenser can be injected into the compression chamber (141) of the compressor through the injection pipe (161).

[0211] The injection pipe (161) can be inserted into and coupled to the fixed end plate portion (131) of the fixed scroll (130). The pipe receiving portion (162) can extend radially inward from the outer surface of the fixed end plate portion (131). Through this, the injection pipe (161) can be received in the pipe receiving portion (162).

[0212] The fixed scroll (130) includes a valve movement guide (163). The valve movement guide (163) is configured to guide the movement of the check valve (165) within the fixed scroll (130). The valve movement guide (163) may extend further radially inward from the pipe receiving portion (162).

[0213] The valve moving guide (163) can be positioned in the same straight line as the injection pipe (161).

[0214] The diameter of the valve moving guide (163) can be formed to correspond to the diameter of the pipe receiving portion (162). The valve moving guide (163) is formed in a cylindrical shape. The valve moving guide (163) can be formed in the same shape as the pipe receiving portion (162).

[0215] Through this, the valve movement guide (163) can guide the movement of the check valve (165) to be described later. The valve movement guide (163) can form an injection path. Here, the injection path refers to a path through which refrigerant is injected through the injection pipe (161).

[0216] The valve moving guide (163) can be connected to communicate with the compression chamber (141). A communication hole (164) can be provided between the valve moving guide (163) and the compression chamber (141).

[0217] The valve moving guide (163) may be positioned axially spaced apart from the compression chamber (141). The communication hole (164) may extend axially between the valve moving guide (163) and the compression chamber (141). The communication hole (164) may be formed to penetrate from the valve moving guide (163) toward the compression chamber (141).

[0218] One end of the communication hole (164) can be connected to the valve moving guide (163). The other end of the communication hole (164) can be connected to the compression chamber (141). Through this, the valve moving guide (163) can be connected to the compression chamber (141) through the communication hole (164).

[0219] The injection pipe (161) can be connected to the compression chamber (141) through the valve moving guide (163) and the communication hole (164).

[0220] The check valve (165) can be mounted to be reciprocally movable on the inner side of the valve moving guide (163). The check valve (165) can reciprocate between a first point (166a) and a second point (166b). For example, the check valve (165) can move from the first point (166a) to the second point (166b) or from the second point (166b) to the first point (166a).

[0221] The first point (166a) may be the initial position of the check valve (165). The first point (166a) may be upstream of the communication hole (164) with respect to the direction of refrigerant flow. More specifically, the first point (166a) may be one end of the valve moving guide (163) that contacts the end of the injection pipe (161).

[0222] The second point (166b) may be a later position of the check valve (165). The second point (166b) may be the downstream side of the communication hole (164) based on the direction of refrigerant flow. Here, the downstream side of the communication hole (164) means the downstream side of the inlet of the communication hole (164) connected to the valve moving guide (163).

[0223] More specifically, the second point (166b) may be the other end of the valve moving guide (163) facing in the opposite direction to the injection pipe (161). However, a spring (167), which will be described later, may be provided at the other end of the valve moving guide (163).

[0224] The spring (167) can be implemented as a coil spring. One end of the spring (167) is connected to the check valve (165). The other end of the spring (167) can be fixed to the other end of the valve moving guide (163).

[0225] Through this, the spring (167) can elastically support the check valve (165). When the check valve (165) moves in one direction from the first point (166a) to the second point (166b), the spring (167) can be compressed. When the check valve (165) moves from the second point (166b) to the first point (166a), the spring (167) can be restored to its original length by elasticity.

[0226] The spring (167) can minimize the occurrence of chatter noise when the check valve (165) moves.

[0227] The maximum travel distance of the check valve (165) is the distance between the first point (166a) and the second point (166b).

[0228] The check valve (165) may be formed in a cylindrical shape. The check valve (165) may be of a piston type. The check valve (165) may have a diameter equal to or greater than the diameter of the injection pipe (161). In this embodiment, the check valve (165) is shown having a diameter equal to the diameter of the injection pipe (161).

[0229] The check valve (165) may have a diameter equal to or slightly smaller than the inner diameter of the valve moving guide (163). The outer diameter of the check valve (165) may be formed slightly smaller to account for the tolerance with respect to the inner diameter of the valve moving guide (163). It is sufficient that the check valve (165) can move along the valve moving guide (163).

[0230] The check valve (165) may have a length greater than or equal to the diameter of the communication hole (164). In this embodiment, the length of the check valve (165) is shown to be equal to the diameter of the communication hole (164).

[0231] The check valve (165) can be configured to open and close the injection pipe (161).

[0232] The check valve (165) may be configured to include a valve body (1651) and a valve side wall (1652). The valve body (1651) may be formed in the shape of a disc. The valve body (1651) may have a diameter corresponding to the diameter of the injection pipe (161). The diameter of the valve body (1651) may be formed to be equal to or slightly smaller than the inner diameter of the valve movement guide (163).

[0233] The valve body (1651) may be configured to include a first surface, a second surface, and a thickness. The first surface of the valve body (1651) is positioned toward the injection pipe (161). The second surface of the valve body (1651) is positioned toward the spring (167) to be described later. The first surface and the second surface of the valve body (1651) are positioned to face opposite directions in the radial direction.

[0234] The first surface of the valve body (1651) may be spaced apart from or in contact with the inner end of the injection pipe (161). By doing so, the valve body (1651) can open and close the injection pipe (161).

[0235] The check valve (165) can be operated by the difference between the refrigerant pressure of the injection pipe (161) and the pressure of the compression chamber (141).

[0236] When the refrigerant in the injection pipe (161) is greater than the pressure in the compression chamber (141), it can overcome the elastic force of the spring (167) that elastically supports the check valve (165) and pressurize the first surface of the valve body (1651).

[0237] Through this, the check valve (165) can move away from the injection pipe (161) by the refrigerant pressure of the injection pipe (161). The check valve (165) can move from the first point (166a) to the second point (166b) along the valve movement guide (163) to open the inlet of the injection pipe (161) and the communication hole (164).

[0238] The maximum travel distance of the check valve (165) is the distance between the first point (166a) and the second point (166b). The maximum travel distance of the check valve (165) may be greater than or equal to the distance from one end of the injection pipe (161) to a point at the entrance of the communication hole (164) furthest away.

[0239] In this embodiment, the maximum travel distance of the check valve (165) is shown as the distance from one end of the injection pipe to a point at the entrance of the communication hole (164) that is furthest away in the radial direction.

[0240] Here, the distance from one end of the injection pipe (161) to a point at the entrance of the communication hole (164) that is furthest away in the radial direction means the maximum distance of the communication hole (164) that is maximally separated along a virtual radial centerline passing radially through the center of the communication hole (164) from the injection pipe (161).

[0241] Through this, the check valve (165) can move from the first point (166a) to the second point (166b) to open both the injection pipe (161) and the communication hole (164). The check valve (165) does not obstruct the flow of refrigerant, and the refrigerant can be smoothly injected through the communication hole (164).

[0242] The check valve (165) can induce refrigerant flow toward the compression chamber (141) so that the refrigerant flow direction is switched only once at the connecting hole (164) while the refrigerant is injected from the injection pipe (161) into the compression chamber (141). By doing so, the check valve (165) can minimize the flow resistance of the refrigerant.

[0243] The check valve (165) is positioned outside the refrigerant flow path, not between the end of the injection pipe (161) and the maximum distance point of the communication hole (164) when the injection pipe (161) is opened. By doing so, the check valve (165) does not obstruct the flow of refrigerant.

[0244] If the check valve (165) is positioned between the end of the injection pipe (161) and the communication hole (164) when open, that is, inside the refrigerant flow path, the refrigerant must pass through the check valve (165) and then flow into the communication hole (164), so a loss in flow path is inevitable.

[0245] However, the check valve (165) according to the present invention can minimize flow path loss when refrigerant is injected.

[0246] Meanwhile, if the pressure in the compression chamber (141) is greater than or equal to the refrigerant pressure in the injection pipe (161), the refrigerant in the compression chamber (141) may flow back into the injection pipe (161).

[0247] The second surface of the valve body (1651) is the surface that is pressurized by the refrigerant when the refrigerant in the compression chamber (141) flows back.

[0248] The valve side wall (1652) may be formed to protrude from the valve body (1651) in a direction opposite to the injection pipe (161). The valve side wall (1652) may protrude radially from the outer circumference of the valve body (1651). The valve side wall (1652) is formed in the shape of a hollow cylinder. The valve side wall (1652) may be formed in a curved shape so as to be in surface contact with the valve movement guide (163).

[0249] Through this, the valve side wall portion (1652) slides while making surface contact along the valve moving guide (163), thereby preventing jamming in the valve moving guide (163). Oil is introduced between the outer surface of the valve side wall portion (1652) and the outer surface of the valve moving guide (163), and friction between the facing curved surfaces can be minimized due to the lubricating action of the oil.

[0250] One end of the valve side wall (1652) is formed to be covered by the valve body (1651). The other end of the valve side wall (1652) may be open. The opening formed at the other end of the valve side wall (1652) allows refrigerant, etc., to flow into the inside of the valve side wall (1652).

[0251] By doing so, when the refrigerant in the compression chamber (141) flows in through the opening of the valve side wall (1652), pressure is applied to the second surface of the valve body (1651), allowing the check valve (165) to return to its original position from the second point (166b) to the first point (166a). The check valve (165) closes the injection pipe (161), thereby preventing the refrigerant in the compression chamber (141) from flowing back into the injection pipe (161).

[0252] The extension direction of the valve moving guide (163) may intersect with the extension direction of the communication hole (164). In this embodiment, the valve moving guide (163) extends radially, and the communication hole (164) extends axially. The valve moving guide (163) intersects the communication hole (164) in a vertical direction.

[0253] When the check valve (165) moves along the valve moving guide (163), it passes through one end of the connecting hole (164) that meets the valve moving guide (163). Of course, the check valve (165) cannot enter the connecting hole (164).

[0254] The check valve (165) can pass through the communication hole (164) at least once while moving along the valve movement guide (163) when opening and closing the injection pipe (161). For example, when the check valve (165) moves from the first point (166a) to the second point (166b), it passes through one end of the communication hole (164) once.

[0255] The check valve (165) can be opened without blocking the entrance of the communication hole (164) formed at one end of the communication hole (164).

[0256] The valve body (1651) of the check valve (165) can block the refrigerant from passing through the communication hole (164). The refrigerant passing through the injection pipe (161) can be blocked by the valve body (1651) and its flow direction can be changed. For example, the refrigerant can move radially along the valve movement guide (163) and then be changed axially toward the communication hole (164).

[0257] Through this, refrigerant can be injected into the compression chamber (141) through the injection pipe (161).

[0258] However, the refrigerant condensed in the condenser can be vaporized by an injection heat exchanger, etc., and then injected into the compression chamber (141) through the injection pipe (161).

[0259] (3) Description of the configuration of the injection cycle device (260) according to another embodiment

[0260] FIG. 3 is a conceptual diagram showing the operating state of an injection cycle device (260) according to another embodiment of the present invention.

[0261] This embodiment differs from the embodiments of FIGS. 1 and 2 described above in that the spring (167) is further provided with a spring fixing part (268).

[0262] A spring fixing part (268) is provided at the other end of the spring (167). The spring fixing part (268) may extend from the other end of the spring (167) in a direction intersecting the longitudinal direction of the spring (167). The spring fixing part (268) may be formed in the shape of a plate. The spring fixing part (268) is configured to fix the spring (167) to the other end of the valve moving guide (163).

[0263] The spring fixing part (268) can be formed as a plate in one of the following shapes: circular, polygonal, elliptical, or arc. In this embodiment, the spring fixing part (268) is shown formed in a circular shape.

[0264] The spring fixing part (268) can expand the contact area between the spring (167) and the valve moving guide (163). A spring coupling part (269) can be formed in a recessed shape at the other end of the valve moving guide (163). The spring coupling part (269) can be formed to correspond to the spring fixing part (268). Here, the statement that the spring coupling part (269) is formed to correspond to the comparison object means that it is formed with the same or similar size and shape.

[0265] The spring fixing part (268) can be fitted into the spring coupling part (269).

[0266] Through this, the spring fixing part (268) can be more easily fixed to the inside of the fixed scroll (130). The spring fixing part (268) can increase the support force of the spring (167) and fix the spring (167) stably and firmly.

[0267] Other components are identical or similar to the embodiments of FIGS. 1 and 2 described above, so a redundant description will be omitted.

[0268] (4) Description of the configuration of the injection cycle device (360) according to another embodiment

[0269] FIG. 4 is a conceptual diagram showing the operating state of an injection cycle device (360) according to another embodiment of the present invention.

[0270] This embodiment differs from the embodiments of FIGS. 1 to 3 described above in that the spring fixing part (368) is formed in the shape of a piston.

[0271] The spring fixing part (368) can be formed in a cylindrical shape. One end of the spring fixing part (368) is closed. One end of the spring fixing part (368) can be connected in close contact with the closed inner surface of the end of the valve moving guide (163). The other end of the spring fixing part (368) can be formed to be open toward the check valve (165).

[0272] The spring fixing part (368) may be configured to include a spring fixing body (3681) and a spring fixing side wall part (3682). The spring fixing body (3681) may extend in a direction intersecting the longitudinal direction of the spring (167). The spring fixing body (3681) may be formed in the shape of a disc. However, the spring fixing body (3681) is not limited to the shape of a disc and may be formed in various shapes.

[0273] One end of the spring (167) can be connected to the spring fixing body (3681). The other end of the spring (167) can be connected to the valve body (1651) of the check valve (165).

[0274] The spring fixing side wall portion (3682) may be formed in the shape of a hollow cylinder. The spring fixing side wall portion (3682) may be formed to protrude toward the check valve (165) from the outer circumference of the spring fixing body (3681). The spring fixing side wall portion (3682) may form the outer surface of the spring fixing portion (368). The diameter of the outer surface of the spring fixing side wall portion (3682) may be formed so that the diameter corresponds to the inner diameter of the valve moving guide (163) so that it comes into contact with the inner surface of the valve moving guide (163).

[0275] One end of the spring-fixing side wall (3682) is blocked by the spring-fixing body (3681). The other end of the spring-fixing side wall (3682) is formed to be open toward the check valve (165), so that one end of the spring (167) can be received inside the spring-fixing side wall (3682).

[0276] The spring fixing part (368) can be connected to the other end of the valve moving guide (163).

[0277] Through this, the spring fixing part (368) can be more easily fixed to the inside of the fixed scroll (130). The spring fixing part (368) can increase the support force of the spring (167) and fix the spring (167) stably and firmly.

[0278] Other components are identical or similar to the embodiments of FIGS. 1 to 3 described above, so a redundant description will be omitted.

[0279] (5) Description of the configuration of the injection cycle device (460) according to another embodiment

[0280] FIG. 5 is a conceptual diagram showing the structure of a check valve (465) according to another embodiment of the present invention.

[0281] This embodiment differs from the embodiments of FIGS. 1 to 4 described above in that a chamfer (469) is further provided in the check valve (465) and the spring fixing part (468).

[0282] The check valve (465) may be formed in a piston-type shape. The check valve (465) includes a valve body (4651) and a valve side wall (4652). The valve body (4651) may extend in a direction intersecting the longitudinal direction of the spring (167). The valve body (4651) may extend in an axial direction. The valve body (4651) may extend in a direction intersecting the longitudinal direction of the injection pipe (161).

[0283] The valve body (4651) can be connected to one end of the spring (167).

[0284] The valve side wall portion (4652) may be formed to protrude in the longitudinal direction of the spring (167) from the outer circumference of the valve body (4651). The valve side wall portion (4652) may be formed to correspond to the inner circumference of the valve movement guide (163).

[0285] The spring fixing part (468) may be formed in a cylindrical shape. The spring fixing part (468) may be configured to include a spring fixing body (4681) and a spring fixing side wall part (4682).

[0286] The spring fixing part (468) may be extended in a direction intersecting the longitudinal direction of the spring (167). The spring fixing part (468) may be extended in an axial direction. The spring fixing part (468) may be extended in a direction intersecting the longitudinal direction of the injection pipe (161). The spring fixing body (4681) may be connected to the other end of the spring (167).

[0287] The spring fixing side wall portion (4682) may be formed to protrude in the longitudinal direction of the spring (167) from the outer circumference of the spring fixing body (4681). The spring fixing side wall portion (4682) may be formed to correspond to the inner circumference of the valve movement guide (163).

[0288] The chamfer portion (469) may be formed at one end of at least one of the valve side wall portion (4652) and the spring-fixed side wall portion (4682). In this embodiment, the chamfer portion (469) is shown formed at one end of both the valve side wall portion (4652) and the spring-fixed side wall portion (4682).

[0289] The chamfer portion (469) may be composed of a first chamfer portion (470a, 470b) and a second chamfer portion (471a, 471b). The first chamfer portion (470a, 470b) may be provided on the valve side wall portion (4652). The first chamfer portion (470a, 470b) may be formed at an angle to the outer surface of the valve side wall portion (4652). The first chamfer portion (470a, 470b) may extend circumferentially along the outer surface of the valve side wall portion (4652).

[0290] The first chamfer portion (470a, 470b) can be formed on the radially outer corner portion and the radially inner corner portion, respectively, of the valve side wall portion (4652).

[0291] The second chamfer portion (471a, 471b) may be provided in the spring-fixing side wall portion (4682). The second chamfer portion (471a, 471b) may be formed at an angle to the outer surface of the spring-fixing side wall portion (4682). The second chamfer portion (471a, 471b) may extend circumferentially along the outer surface of the spring-fixing side wall portion (4682).

[0292] The second chamfer portion (471a, 471b) can be formed on the radially outer corner portion and the radially inner corner portion, respectively, of the spring-fixed side wall portion (4682).

[0293] When the check valve (465) moves, the viscosity of the oil introduced between the inner surface of the valve moving guide (163) and the outer surface of the valve side wall (4652) can be increased.

[0294] As a result, the operation of the check valve (465) may be delayed.

[0295] To resolve these problems, the first chamfer section (470a, 470b) can act as a passage to introduce oil into the gap between the inner surface of the valve moving guide (163) and the outer surface of the valve side wall section (4652) when the check valve (465) moves, or to discharge oil from the gap.

[0296] The second chamfer section (471a, 471b) can act as a passage to introduce oil into the gap between the inner surface of the valve moving guide (163) and the outer surface of the spring fixing side wall section (4682) when the check valve (465) moves, or to discharge oil from the gap.

[0297] Through this, the chamfer (469) can prevent the operation delay of the check valve (465) caused by the viscosity of the oil flowing into the gap.

[0298] Other components are identical or similar to the embodiments of FIGS. 1 to 4 described above, so a redundant description will be omitted.

[0299] (6) Description of the configuration of the injection cycle device (560) according to another embodiment

[0300] FIG. 6 is a conceptual diagram showing the operating state of an injection cycle device (560) according to another embodiment of the present invention.

[0301] This embodiment differs from the embodiments of FIGS. 1 to 5 described above in that the injection cycle device (560) further comprises a valve seat (571).

[0302] The valve seat (571) can be positioned in close contact with the end of the injection pipe (161). The valve seat (571) can be formed in a ring shape. The diameter of the valve seat (571) can be formed to be the same as the diameter of the check valve.

[0303] The valve seat (571) may be formed of a material such as rubber. The valve seat (571) may be mounted on one end of a valve moving guide (163) adjacent to a pipe receiving portion (562) into which an injection pipe (161) is inserted.

[0304] One end of the valve moving guide (163) may be formed with a step difference from one end of the pipe receiving portion (562). Here, being formed with a step difference means that the diameter of the valve moving guide (163) and the diameter of the pipe receiving portion (562) are different from each other.

[0305] In this embodiment, the diameter of the pipe receiving portion (562) is larger than the diameter of the valve moving guide (163).

[0306] The check valve (165) may come into contact with the valve seat (571) when moving to the first point (166a).

[0307] The valve seat (571) can limit the first point (166a). The check valve (165) can be in close contact with the valve seat (571) and stop at the first point (166a).

[0308] Through this, the valve seat (571) can maintain a seal between the check valve (165) and the injection pipe (161) when the injection pipe (161) is closed. The valve seat (571) can prevent refrigerant from leaking through the gap between one end of the adjacent check valve (165) and one end of the injection pipe (161). Explanation of the symbols

[0309] 100 : Casing 101 : Cylindrical shell 102 : Upper shell 1021 : Upper space 103 : Lower shell 1031 : Lower space 104 : Discharge pipe 110 : Drive motor 111 : Stator 112 : Stator core 1123 : 1st oil groove 113 : Stator coil 1131 : First Insulator 1132 : Second Insulator 114: Rotor 115 : Rotor core 116 : Permanent magnet 117 : Rotation axis 118 : Oil pickup 1181 : Blocking member 119 : Eccentric 120 : Compression section 121 : Mainframe 122 : Frame end plate section 123 : Main bearing section 124 : Frame side wall 1241 : 1st connecting hole 1242 : Recess section 125 : Oldham Ring 126 : Swivel Scroll 127 : Rotating plate section 128 : Turning Rap 129 : Rotation shaft coupling part 130 : Fixed scroll 131 : Fixed tip plate section 132 : Fixed sidewall 1321 : 2nd oil groove 133 : Intake port 134 : Suction tube 135 : Fixed Wrap 136 : Fixed bearing section 138 : Discharge cover 1381 : Muffler space 139 : Discharge hole 1391 : Discharge valve 140 : Bypass hole 141 : Compression chamber 141a: First compression chamber 141b: Second compression chamber 142 : 2nd connecting hole 150 : Euro Separator Unit 151 : The 1st Euroguide 152 : 2nd Euroguide 153 : Guide connection part 154 : Guide hole 160: Injection cycle device 161 : Injection pipe 162 : Pipe receiving section 163 : Valve Movement Guide 164 : Chimney hole 165 : Check valve 1651 : Valve body 1652 : Valve sidewall 166a : 1st point 166b : 2nd branch 167 : Spring 260: Injection cycle device 268 : Spring fixing part 269 ​​: Spring coupling part 360: Injection cycle device 368 : Spring fixing part 3681 : Spring-fixed body 3682 : Spring-fixed side wall 460: Injection cycle device 465 : Check valve 4651 : Valve body 4652 : Valve sidewall 468 : Spring fixing part 4681 : Spring-fixed body 4682 : Spring-fixed side wall 469 : Chamfer 470a, 470b: First chamber 471a, 471b: Second Chamber 560: Injection cycle device 562 : Pipe receiving section 571 : Valve seat

Claims

Claim 1 A fixed end plate portion; a fixed side wall portion protruding from the outer periphery of the fixed end plate portion and forming a compression chamber together with the fixed end plate portion; a fixed wrap protruding inwardly from the fixed end plate portion to the fixed side wall portion; an injection pipe connected to the side of the fixed end plate portion to communicate with the compression chamber and injecting refrigerant into the compression chamber; a check valve movably installed inwardly on the fixed end plate portion to open and close the injection pipe; and a spring elastically supporting the check valve, wherein the maximum travel distance of the check valve moving away from the injection pipe is greater than or equal to the distance from the injection pipe to the communication hole communicating with the compression chamber. Claim 2 A fixed scroll according to claim 1, comprising: a pipe receiving portion extending in one direction from the side of the fixed end plate portion and receiving the injection pipe; and a valve moving guide further extending in one direction from the inner side of the fixed end plate portion and allowing the movement of the check valve, wherein the communication hole is formed to penetrate from the valve moving guide to the compression chamber. Claim 3 A fixed scroll according to claim 1, wherein the check valve is capable of reciprocating between a first point and a second point, the first point is located upstream of the communication hole based on the flow direction of the refrigerant injected through the injection pipe when the check valve is opened, and the second point is located downstream of the communication hole. Claim 4 In claim 1, the check valve is a fixed scroll formed in a cylindrical shape. Claim 5 In claim 1, the check valve is a fixed scroll that is in surface contact with the inner circumference of the pipe receiving portion in which the injection pipe is received. Claim 6 In claim 1, the check valve has a diameter greater than or equal to the diameter of the injection pipe; and a fixed scroll having a length greater than or equal to the diameter of the communication hole. Claim 7 In claim 1, the communication hole is formed to extend in a direction intersecting the extension direction of the injection pipe, and the check valve is a fixed scroll that passes one side of the communication hole at least once when the injection pipe is opened or closed. Claim 8 In claim 1, the check valve comprises: a valve body disposed to be in contact with the end of the injection pipe; and a valve side wall portion formed to protrude in the opposite direction to the injection pipe from the valve body, a fixed scroll. Claim 9 In claim 8, the valve body has a diameter greater than or equal to the diameter of the injection pipe, and the valve side wall has a length greater than or equal to the diameter of the communication hole, a fixed scroll. Claim 10 In claim 1, the check valve is guided to move in the extension direction along a valve moving guide extending in the extension direction of the injection pipe from the inner side of the fixed end plate portion, and when the injection pipe is opened, it moves in a direction away from the injection pipe to open the communication hole together, the fixed scroll. Claim 11 In claim 10, the check valve is actuated by the pressure difference between the injection pipe and the compression chamber, and the check valve is a fixed scroll positioned between the end of the injection pipe and the communication hole when the injection pipe is closed. Claim 12 In claim 1, the spring is a fixed scroll that is compressed by the pressure of the injection pipe when the check valve is opened and is tensioned to its original position by the pressure of the compression chamber when the check valve is closed. Claim 13 In paragraph 1, the spring is a coil spring, a fixed scroll. Claim 14 A fixed scroll according to claim 1, wherein one end of the spring is connected to the check valve and the other end of the spring is coupled to the inside of the fixed end plate. Claim 15 A fixed scroll according to claim 1, further comprising a spring fixing part extending from one end of the spring in a direction intersecting the longitudinal direction of the spring, wherein the spring fixing part is coupled to the inner side of the fixed end plate part. Claim 16 In item 15, the spring fixing part is formed as a plate in one of the shapes of a circle, polygon, ellipse, or arc, and the fixed scroll is formed such that the spring coupling part is recessed on the inner side of the fixed end plate part so as to be coupled to receive the spring fixing part. Claim 17 In claim 1, the spring fixing part for fixing the spring comprises: a spring fixing body that extends in a direction intersecting the longitudinal direction of the spring and is connected to one end of the spring; and a spring fixing side wall part formed to protrude toward the check valve from the outer circumference of the spring fixing body, and a fixed scroll. Claim 18 In claim 1, the check valve comprises: a valve body extending in a direction intersecting the longitudinal direction of the spring and connected to one end of the spring; and a valve side wall portion protruding in the longitudinal direction of the spring from the outer periphery of the valve body, and the spring fixing portion for fixing the spring comprises: a spring fixing body extending in a direction intersecting the longitudinal direction of the spring and connected to the other end of the spring; and a spring fixing side wall portion protruding in the longitudinal direction of the spring from the outer periphery of the spring fixing body, wherein a chamfer portion is formed at one end of at least one side wall portion among the valve side wall portion and the spring fixing side wall portion. Claim 19 A fixed scroll according to claim 1, further comprising: a pipe coupling portion into which the injection pipe is inserted and coupled; and a valve seat provided at the end of the pipe coupling portion and in close contact with the check valve when the check valve is closed. Claim 20 A casing; a drive motor having a stator coupled to the inner circumference of the casing and a rotor rotatably disposed with an air gap inside the stator; a main frame disposed on one side of the drive motor; a pivot scroll; and a compression unit having a fixed scroll coupled to engage with the pivot scroll and forming a compression chamber together with the pivot scroll. A scroll compressor comprising a rotating shaft that transmits rotational force from the drive motor to the compression section, wherein the fixed scroll comprises: a fixed end plate section; a fixed side wall section protruding from the outer periphery of the fixed end plate section and forming a compression chamber together with the fixed end plate section; an injection pipe connected to the side of the fixed end plate section in communication with the compression chamber and injecting refrigerant into the compression chamber; and a check valve movably installed inside the fixed end plate section to open and close the injection pipe, wherein the maximum travel distance of the check valve moving away from the injection pipe is greater than or equal to the distance from the injection pipe to the communication hole communicating with the compression chamber.

Images