compressor

Abstract

A compressor comprises a housing (101), a pair of screw rotors (110), and an unloading device (109). The housing (101) has a rotor chamber (105) and an exhaust chamber (180); the pair of screw rotors (110) are located at least partially within the rotor chamber (105), and a compression chamber (150) may be formed between the teeth and the housing (101), and has an intake end (112) and an exhaust end (113); the housing (101) further comprises an unloading channel (208) and a connecting channel (308), the unloading channel (208) has an unloading channel inlet (216) and an unloading channel outlet (217), the unloading channel inlet (216) may be in communication with the compression chamber (150) through the connecting channel (308), and the unloading channel outlet (217) may be in communication with the intake side of the compressor; The unloading device (109) is configured to controllably open and close the connection channel (308) so that the compression chamber (150) can be controllably connected to or separated from the connection channel (308). The compressor can reduce the load during initial operation.

Description

Technology Field

[0001] The present application relates to a compressor, and in particular to a screw compressor having an unloading device. Background Technology

[0002] A screw compressor is a common component of a cooling device. A screw compressor completes the processes of gas intake, compression, and discharge by utilizing the tooth groove volumes of a pair of screw rotors to interlock and induce a change in the basic volume composed of the tooth-shaped spaces. A pair of interlocking screw rotors are arranged parallel to each other within the body of the screw compressor; one end of the screw rotor is connected to the intake port of the body as the intake end, and the other end is connected to the exhaust port of the body as the exhaust end. As the screw rotor rotates, gas is drawn in at the intake end, compressed, and then discharged at the exhaust end.

[0003] Screw compressors require a certain amount of time to operate smoothly after activation, and during this process, the actual operating conditions differ significantly from those during smooth operation. Since there is a high probability of issues such as operational difficulties, high operating torque, and motor overload occurring when operating a screw compressor, measures to reduce overload during operation must be sought when designing the compressor.

[0004] The present application provides a compressor, wherein the compressor comprises a housing, a pair of screw rotors, and an unloading device, wherein the housing has a rotor chamber and an exhaust chamber, wherein the pair of screw rotors are at least partially located within the rotor chamber, and a compression chamber may be formed between the teeth of the pair of screw rotors and the housing, and wherein the pair of screw rotors have an intake side and an exhaust end; wherein the housing also comprises an unloading channel and a connecting channel, wherein the unloading channel has an unloading channel inlet and an unloading channel outlet, wherein the unloading channel inlet communicates with the compression chamber through the connecting channel and the unloading channel outlet communicates with the intake side of the compressor; and wherein the unloading device is configured to controllably open and close the connecting channel so that the compression chamber can be controllably communicated with or separated from the connecting channel.

[0005] As with the compressor described above, when the compressor is operated, the unloading device opens the connection channel so that the inlet of the unloading channel is opened, thereby allowing the compression chamber to communicate with the intake side of the compressor.

[0006] As with the compressor described above, the housing also includes an unloading device chamber and a cover, the near end of the unloading device chamber forms the connection channel, and the end of the unloading device chamber is closed by the cover.

[0007] As with the compressor described above, the unloading device chamber has an unloading device chamber opening, and the area of ​​the unloading device chamber opening is larger than the area of ​​the inlet of the unloading channel.

[0008] As with the compressor described above, the exhaust end of the pair of screw rotors has an exhaust cross-section, and the unloading device chamber opening, the inlet of the unloading channel, and the exhaust cross-section are on the same plane, and the unloading device chamber opening overlaps simultaneously with at least a part of the inlet of the unloading channel and at least a part of the exhaust cross-section.

[0009] As with the compressor described above, the unloading device includes a piston and an elastic device, and the piston can move within the chamber of the unloading device and the elastic device can provide elastic force. Thus, the unloading device is configured such that when the pressure applied to the piston is less than the elastic force of the elastic device, the piston moves away from the inlet of the unloading channel to open the connection channel, and when the pressure applied to the piston is greater than the elastic force of the elastic device, the piston closes the inlet of the unloading channel to close the connection channel, and the pressure is provided by the exhaust pressure of the compressor.

[0010] As with the compressor described above, the piston has a head and a body, the diameter of the head is larger than the diameter of the body, and the unloading device chamber has a first section and a second section, wherein the diameter of the second section is smaller than the diameter of the first section, the first section is adjacent to the cover, and the head is received in the first section and is sealed with the inner wall of the first section; one end of the elastic device contacts the stepped surface formed by the first section and the second section, and the other end contacts the head of the piston, and the elastic device provides an elastic force to allow the piston to move away from the inlet of the unloading channel, thereby opening the connection channel, and the head of the piston is pressurized so that the piston moves toward the inlet of the unloading channel to close the connection channel.

[0011] As with the compressor described above, the unloading device chamber is connected to the exhaust chamber of the compressor through a connecting channel, and a throttle element is disposed in the connecting channel.

[0012] As with the compressor described above, a buffer device is disposed in the connection channel, and the buffer device is disposed between the unloading device chamber and the throttle element.

[0013] As with the compressor described above, a cover channel is disposed in the cover, and the cover channel forms the throttle element.

[0014] As with the compressor described above, the throttle element and the buffer device are disposed in the housing.

[0015] As with the compressor described above, the housing has a housing compounding surface positioned to face the exhaust cross-section of the exhaust end of a pair of screw rotors, an exhaust port is positioned on the housing compounding surface, and a certain gap exists between the unloading device chamber opening and the exhaust port in the radial direction.

[0016] The compressor of the present application includes an unloading device, which can reduce the compression load when the compressor is just starting to operate and restore the load when the compressor is operating smoothly. The unloading device of the present application can be adjusted according to the operating state of the compressor. Brief explanation of the drawing

[0017] FIG. 1A is a local stereoscopic view of a screw compressor according to one embodiment of the present application. Fig. 1B is an exploded view of the screw compressor of Fig. 1A. FIG. 1C is a cross-sectional view of the screw compressor of FIG. 1A in the direction of one shaft. Fig. 2A is a three-dimensional view of the rotor seat of Fig. 1B. FIG. 2B is a side view of the rotor seat of FIG. 2A. FIG. 2C is a cross-sectional view of the rotor sheet of FIG. 2B cut along line AA. Fig. 3A is a three-dimensional view of the exhaust seat of Fig. 1B. Fig. 3B is a side view of the exhaust seat of Fig. 3A. FIG. 3C is a cross-sectional view of the exhaust sheet of FIG. 3B cut along the BB line. Fig. 3D is a front view of the exhaust seat of Fig. 3A. Fig. 4A is a three-dimensional view of an unloading device. FIG. 4B is an exploded view of the unloading device of FIG. 4A. Fig. 5A is a side view of the screw compressor of Fig. 1A. FIG. 5B is a cross-sectional view of the screw compressor of FIG. 5A cut along CC. FIG. 5C is another cross-sectional view of the screw compressor of FIG. 5A cut along CC. FIG. 6 is a diagram of a first embodiment of the connection relationship between the unloading device chamber and the compressor exhaust chamber of the compressor of the present application. FIG. 7 is a diagram of a second embodiment of the connection relationship between the unloading device chamber and the compressor exhaust chamber of the compressor of the present application. FIG. 8 is a diagram of a third embodiment of the connection relationship between the unloading device chamber and the compressor exhaust chamber of the compressor of the present application. Specific details for implementing the invention

[0018] Hereinafter, various specific embodiments of the present application will be described with reference to the accompanying drawings, which constitute part of this specification. Although structural parts and elements of various embodiments of the present application have been described using terms indicating direction such as "front," "back," "top," "bottom," "left," "right," "inside," "outside," "upper," "lower," "front," "rear," "near end," "far end," "transverse," and "longitudinal" in this application, these terms used herein are merely for convenience of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this application may be installed in different directions, these terms indicating direction are merely descriptive and should not be considered restrictive.

[0019] FIG. 1A is a local stereoscopic view of a screw compressor according to one embodiment of the present application, FIG. 1B is an exploded view of the screw compressor of FIG. 1A, and FIG. 1C is a cross-sectional view of one shaft direction of the screw compressor of FIG. 1A. FIG. 1A to FIG. 1C illustrate some parts of a screw compressor. As illustrated in FIG. 1A to FIG. 1C, the screw compressor comprises a housing (101), a pair of screw rotors (110), and an unloading device (109, 119). Here, the housing (101) comprises a rotor seat (131) and an exhaust seat (132).

[0020] The rotor seat (131) has a rotor chamber (105) for accommodating a pair of screw rotors (110). The rotor seat (131) has an exhaust chamber (180), and the exhaust chamber (180) is in communication with the exhaust port (181) of the compressor.

[0021] A pair of screw rotors (110) includes a pair of male rotors (121) and female rotors (122) that are interlocked with each other, and the male rotors (121) and female rotors (122) can be rotated. A pair of screw rotors (110) includes a tooth portion (160) and shaft portions (161, 162) that are respectively connected to both ends of the tooth portion (160). In the tooth portion (160) of the pair of screw rotors (110), the male rotor (121) has multiple helical teeth and grooves are formed between adjacent teeth, and the female rotor (122) also has multiple helical teeth and grooves are formed between adjacent teeth. The male rotor (121) and female rotor (122) form an interlocking structure through the grooves corresponding to the teeth and form a compression chamber together with the housing (101) (see FIG. 5A).

[0022] Along the shaft direction of a pair of screw rotors (110), the tooth portion (160) of the pair of screw rotors (110) has an intake portion (112) and an exhaust portion (113). Gas is drawn into the compression chamber (150) from the intake portion (112) and gradually moves toward the exhaust portion (113) as the pair of screw rotors (110) rotate. At the same time, as the pair of screw rotors (110) rotate, the volume of the compression chamber (150) gradually decreases, and the gas inside the compression chamber (150) is gradually compressed. The compressed gas flows from the exhaust portion (113) into the exhaust chamber (180) of the compressor and is then discharged from the exhaust port (181) of the compressor. The exhaust portion (113) has an exhaust section (118).

[0023] FIG. 2A is a three-dimensional view of the rotor sheet of FIG. 1B, FIG. 2B is a side view of the rotor sheet of FIG. 2A, and FIG. 2C is a cross-sectional view of the rotor sheet of FIG. 2B cut along line AA. As illustrated in FIG. 2A to FIG. 2C, the rotor sheet (131) includes a rotor sheet front end (211) and a rotor sheet rear end (212). The rotor sheet front end (211) is adjacent to the intake end (112) of a pair of screw rotors (110), and the rotor sheet rear end (212) is adjacent to the exhaust end (113) of a pair of screw rotors (110). The rotor sheet rear end (212) is connected to the exhaust sheet (132), and the rotor sheet rear end (212) has a rear end surface (207). The rotor chamber (105) extends through the rear end surface (207) to form a rotor chamber opening (215). The rotor seat (131) has an unloading channel (208) and an unloading channel (209) that cooperate with the unloading device (109, 119), respectively. The unloading channel (208) and the unloading channel (209) are each located on both sides in the shaft direction of the rotor chamber (105) so as to be adjacent to the female rotor (122) and the male rotor (121), respectively. The unloading channel (208) and the unloading channel (209) have similar structures but different locations, and the structure of the unloading channel is introduced next using the unloading channel (208) as an example. In other embodiments, the unloading channel may be set to one or several depending on actual demand.

[0024] The unloading channel (208) extends from the front end (211) of the rotor seat toward the rear end and is positioned parallel to the compression chamber (150). The unloading channel (208) is separated from the rotor chamber (105) by a partition (285). The unloading channel (208) has an unloading channel inlet (216) and an unloading channel outlet (217). The unloading channel inlet (216) is located on the rear end surface (207) and is spaced apart from the rotor chamber opening (215). The outlet (217) of the unloading channel is adjacent to the intake end (112) of a pair of screw rotors and connects to the rotor chamber (105). The unloading channel outlet (217) is configured to communicate with the intake side of the compressor. The unloading channel (208) is used to connect the unloading channel inlet (216) located on the rear end (207) with the intake side of the compressor.

[0025] In another embodiment of the present application, the unloading channel (208) may extend in a different direction within the rotor seat (131), and the inner chamber of the unloading channel (208) may have two or more sections having different shapes.

[0026] FIG. 3A is a three-dimensional view of the exhaust sheet of FIG. 1B, FIG. 3B is a side view of the exhaust sheet of FIG. 3A, FIG. 3C is a cross-sectional view of the exhaust sheet cut along line BB of FIG. 3B, and FIG. 3D is a front view of the exhaust sheet of FIG. 3A.

[0027] As illustrated in FIGS. 3A to 3D, the exhaust sheet (132) has a first stage (311) and a second stage (312), and the first stage (311) is connected to the rotor sheet (131). The cross-section of the first stage (311) forms a housing compounding surface (341), and the housing compounding surface (341) is compounded with the rear end surface (207) of the rotor sheet (131).

[0028] The exhaust seat (132) has a rotor shaft chamber (361, 362), an exhaust chamber (180), and an unloading device chamber (310, 320).

[0029] The rotor shaft chambers (361, 362) are used to accommodate the shaft of the screw rotor (110), and the rotor shaft chambers (361, 362) form a rotor shaft opening (371, 372) on the housing compounding surface (341). The exhaust chamber (180) forms an exhaust chamber opening (366) on the housing compounding surface (341). The unloading device chambers (310, 320) form an unloading device chamber opening (367, 368) on the housing compounding surface (341). Here, there is a certain gap between the exhaust chamber opening (366) and the unloading device chamber opening (367, 368).

[0030] The housing coupling surface (341) has a rotor projection area (382), and the rotor projection area (382) is a projection area formed on the housing coupling surface (341) along the shaft direction during the rotation of the pair of screw rotors (110). The rotor projection area (382) is generally "8" shaped and is positioned to surround the rotor shaft openings (371, 372).

[0031] During the rotation of a pair of screw rotors (110), the range swept by the exhaust cross-section (118) of the housing compounding surface (341) is within the range defined by the rotor projection area (382). The rotor projection area (382) has a sealing area (326), a first opening area (328), and a second opening area (338, 339). Here, the overlapping portion of the exhaust chamber opening (366) and the rotor projection area (382) forms the first opening area (328), the overlapping portion of the unloading device chamber opening (367, 368) and the rotor projection area (382) forms the second opening area (338, 339), and the remaining portion forms the sealing area (326). The second opening region (338, 339) is located downstream of the corresponding screw rotor's rotational direction relative to the first opening region (328). In other words, during the rotation process, the screw rotor first passes through the second opening region (338, 339) and then reaches the first opening region (328).

[0032] The compression chamber (150) forms the material of the compression chamber (150) in a plane where the exhaust cross-section (118) of a pair of screw rotors is located. A sealing region (326) seals the material of the compression chamber (150), so that the compression chamber (150) can form a sealed chamber. During the rotation of the pair of screw rotors (110), if the material of the compression chamber (150) is aligned with the sealing region (326), the compression chamber (150) and the exhaust chamber (180) are separated, and the coolant gas inside the compression chamber (150) can be compressed; if the material of the compression chamber (150) is aligned with or partially aligned with the first opening region (328), the compression chamber (150) communicates with the exhaust chamber (180), and the gas inside the compression chamber (150) can be discharged; When the fabric of the compression chamber (150) is aligned or partially aligned with the second opening area (338, 339), the compression chamber (150) is optionally connected to or disconnected from the unloading channel. The relationship of the compression chamber (150) being optionally connected to the unloading channel is described in detail below.

[0033] The exhaust sheet (132) also includes covers (315, 316) that cover the fabric of each of the unloading device chambers (310, 320). Here, the unloading device chambers (310, 320) have similar structures but different locations, and the structure thereof is introduced next using the unloading device chamber (310) as an example.

[0034] As illustrated in FIG. 3C, the unloading device chamber (310) is formed by the unloading device chamber opening (367) extending toward the inside of the exhaust sheet. The fabric of the unloading device chamber (310) (i.e., one end away from the unloading device chamber opening (367)) is closed by a cover (315). The unloading device chamber (310) has a first section (321) and a second section (322), the first section (321) is adjacent to the unloading device chamber opening (367), and the second section (322) is adjacent to the cover (315). Since the diameter of the second section (322) is smaller than the diameter of the first section (321), a stepped surface (333) is formed at the connection between the first section (321) and the second section (322). The shape of the unloading device chamber (310) is configured to cooperate with the unloading device (109) so that the unloading device (109) can move within the unloading device chamber (310).

[0035] The unloading device chamber (310) has a connection channel (308), and the connection channel (308) is formed by a portion of the first section (321) of the unloading device chamber (310) near the unloading device chamber opening (367). In other words, the connection channel (308) is one of the first sections (321).

[0036] A cover channel (380) is disposed in the cover (315), and the extension direction of the cover channel (380) is substantially the same as the extension direction of the unloading device chamber (310). The cover channel (380) penetrates the cover (315) to form a through hole in the cover (315). The cover channel (380) communicates the unloading device chamber (310) with the high-pressure side of the compressor. The diameter of the cover channel (380) is thin, so the cover channel (380) controls the fluid flow introduced into the unloading device chamber (310) through the cover channel (380) as a throttle element.

[0037] FIG. 4A is a three-dimensional view of an unloading device, FIG. 4B is an exploded view of the unloading device of FIG. 4A, and as shown in FIG. 4A and FIG. 4B, the unloading device (109) includes a piston (401) and an elastic device (402). The piston (401) has a head (411) and a body (412). Here, the diameter of the head (411) is larger than the diameter of the body (412), the outer diameter of the head (411) matches the inner diameter of the first section (321) of the unloading device chamber (310), and the outer diameter of the body (412) matches the inner diameter of the second section (322) of the unloading device chamber (310), and the head (411) is accommodated in the first section (321) and the body (412) is accommodated in the second section (322). Here, the length of the first section (321) of the unloading device chamber (310) in the shaft direction is longer than the length of the head (411) of the piston (401), and the length of the second section (322) of the unloading device chamber (310) is longer than the length of the body (412) of the piston (401), so that the piston (401) can move within a certain range along the shaft direction in the unloading device chamber (310). The head (411) has a side (423) connecting the inner surface (421) and the outer surface (422) that are positioned relative to each other. The inner surface (421) faces the body (412), and the outer surface (422) moves away from the body (412). The elastic device (402) is a spring, and the elastic device (402) is set on the body (412) of the piston. One end of the elastic device (402) contacts the inner surface (421) of the head (411) or is connected to the inner surface (421) of the head (411). To reinforce the seal between the head (411) and the inner wall of the first section (321), the side (423) of the head may be installed as a sealing ring. The material of the main body (412) has a piston sealing section (455). The shape of the piston sealing section (455) is matched with the shape of the unloading device chamber opening (367) so that the piston sealing section (455) can seal the unloading device chamber opening (367).

[0038] FIG. 5A is a side view of the screw compressor of FIG. 1A, FIG. 5B is a cross-sectional view of the screw compressor cut along CC of FIG. 5A, showing the piston in an open position, FIG. 5C is another cross-sectional view of the screw compressor cut along CC of FIG. 5A, showing the piston in a closed position.

[0039] As illustrated in FIG. 5A, the unloading device chamber opening (367) is aligned simultaneously with at least a portion of the unloading channel inlet (216) and a portion of the screw rotor chamber opening (215). In other words, the unloading device chamber (310) can communicate the material of the compression chamber (150) with the unloading channel (208).

[0040] In the position illustrated in FIG. 5A, the piston (401) is in an open position. One end of the elastic device (402) contacts the inner surface (421) of the head (411) of the piston (401), and the other end contacts the stepped surface (333) formed at the connection between the first section (321) and the second section (322). The elastic device (402) is in a compressed state and provides the piston (401) with an elastic force in a direction away from the unloading device chamber opening (367). At this time, the piston (401) does not receive an external force opposite to the direction of the elastic force, or the external force received is smaller than the elastic force of the elastic device, so the piston (401) is in the furthest position relative to the unloading device chamber opening (367). At this time, the head of the piston (401) cannot move further toward the unloading device chamber opening (367) because it contacts the cover (315).

[0041] There is a certain gap between the piston sealing section (455) of the piston (401) and the unloading device chamber opening (367), so that the portion between the piston sealing section (455) and the unloading device chamber opening (367) forms a connecting channel (308). In other words, when the piston (401) is in an open position, the piston is located outside the connecting channel (308). The connecting channel (308) has a chamber, so that the connecting channel (308) communicates with the compression chamber (150) and the unloading channel (208). At this time, the compression chamber (150) is not yet connected to the discharge cavity (366), and a portion of the compressed coolant gas in the compression chamber (150) is connected to the intake side of the compressor through the unloading channel (208), thereby reducing the load of the compressor.

[0042] In the position illustrated in FIG. 5B, the piston (401) is in a closed position. The piston (401) receives a force opposite to the direction of the elastic force of the elastic device, thereby overcoming the elastic force of the elastic device and allowing the piston (401) to enter the connecting channel (308) and come into contact with the rear end surface (207) of the rotor seat (131). At this time, the connecting channel (308) is filled with the body of the piston (401), and the connecting channel (308) is closed. The piston sealing end surface (455) aligns with the unloading device chamber opening (367) and seals the unloading device chamber opening (367). The compression chamber (150) and the unloading channel (208) are blocked by the piston sealing end surface (455) and cannot communicate with each other. In the closed position of the piston, the coolant in the compression chamber (150) continues to be compressed before flowing into the discharge chamber (180).

[0043] Since the cover channel (380) of the cover (315) is connected to the exhaust side of the compressor, the pressure on the outer surface (422) of the head (411) of the piston (401) changes as the pressure on the compressor exhaust side changes. The piston of the present application can be automatically adjusted according to the operating state of the compressor, and the piston (401) is in an open position when the compressor is just starting to operate, and the piston (401) is in a closed position when the compressor is operating stably. When the compressor needs to be operated, the lower the load, the lower the operating torque, thereby promoting rapid operation of the compressor. When the compressor of the present application is just starting to operate, the pressure on the exhaust side of the compressor is low, so the piston cannot overcome the elastic force of the elastic device to seal the unloading device chamber opening (367). At this time, the connection channel (308) is opened, and a portion of the gas flowing into the compression chamber (150) passes through the connection channel (308) and the unloading channel (208) to reach the intake side of the compressor and does not participate in compression, so the intake volume of the compressor is reduced, and the load of the compressor is relatively small. When the operation of the compressor reaches a stable state, the pressure on the exhaust side of the compressor increases, and as the pressure on the exhaust side is applied to the piston (401) through the cover channel (380), the piston (401) moves as far as possible toward the sealed unloading device chamber opening (367) of the piston. At this time, the connection channel (308) is padded and closed by the piston (401), and the compression chamber (150) is separated from the unloading channel (208). The compressor reaches a fully loaded state. Since the opening and closing of the piston (401) is automatically associated with the operating state of the compressor, manual intervention is not required.

[0044] In the present application, in the direction of rotation of the rotor, there is a certain gap between the unloading device chamber opening (367, 368) and the exhaust chamber opening (366), so when the connecting channel is connected, the coolant gas does not yet reach the maximum compression state, that is, the state in which it begins to communicate with the intake side. In another embodiment of the present application, the position of the unloading device chamber opening (367, 368) can be set as needed. In the direction of rotation of the rotor, the distance between the unloading device chamber opening (367, 368) and the exhaust chamber opening (366) may affect the magnitude of the unloading capacity of the unloading device.

[0045] FIG. 6 is a diagram of a first embodiment regarding the connection relationship between the unloading device chamber (310) of the compressor and the compressor exhaust chamber of the present application. In the embodiment illustrated in FIG. 6, the cover channel (380) communicates with the compressor exhaust chamber through the connection channel (608). A throttle element (611) and a buffer device (612) are disposed in the connection channel, wherein the buffer device (612) is disposed between the throttle element (611) and the cover (315). The throttle element (611) and the buffer device (612) reduce the pressure of the coolant gas on the unloading device (109) on the exhaust side of the compressor, thereby preventing the unloading device (109) from receiving excessive shock. The buffer device (612) provided in the throttle element (611) may be optionally configured according to the actual demand of the compressor, and in one embodiment, since the throttle element (611) can meet the demand, there is no need to install the buffer device (612). In another embodiment, multiple levels of throttle elements and buffers may be arranged. In yet another embodiment, the channel of the cover channel (380) is thinner so that the cover channel (380) forms a throttle element to further throttle the coolant gas.

[0046] In another embodiment, the cover channel (380) can be connected to any location on the high-pressure side of the air conditioning system.

[0047] FIG. 7 is a diagram of a second embodiment of the connection relationship between the unloading device chamber (310) and the compressor exhaust chamber of the compressor of the present application. Similar to the embodiment shown in FIG. 6, the difference is that in the embodiment of FIG. 7, the connection channel (708) is positioned in the compressor housing (101). Compared to the embodiment shown in FIG. 6, the embodiment shown in FIG. 7 is more compact and can achieve the same technical effect.

[0048] FIG. 8 is a diagram of a third embodiment regarding the connection relationship between the unloading device chamber (310) and the compressor exhaust chamber of the compressor of the present application. In the embodiment illustrated in FIG. 8, the buffer device is formed as a cover. As illustrated in FIG. 8, the cover (815) has a constant thickness in the shaft direction, and there is also a cover chamber (830) inside the cover, and the cover chamber (830) communicates with the unloading device chamber (310). The cover chamber (830) has a constant volume and can act as a buffer, thereby forming a buffer device.

[0049] The compressor of the present application can automatically adjust the load condition during operation and stable operation to ensure that the compressor is in a better operating state.

[0050] Although only some features of the present application have been illustrated and described in this specification, those skilled in the art may make various modifications and changes. Accordingly, it should be understood that the appended claims are intended to encompass all modifications and changes that fall within the substantive scope of the present application.

Claims

Claim 1 A compressor comprises: a housing (101) having a rotor chamber (105) and an exhaust chamber (180), further comprising an unloading channel (208) and a connecting channel (308), wherein the unloading channel (208) has an unloading channel inlet (216) and an unloading channel outlet (217); a pair of screw rotors (110) which are at least partially located within the rotor chamber (105), wherein a compression chamber (150) may be formed between its teeth and the housing (101), and which have an intake end (112) and an exhaust end (113), wherein the unloading channel inlet (216) may be in communication with the compression chamber (150) through the connecting channel (308), and the unloading channel outlet (217) may be in communication with the intake side of the compressor; and wherein the connecting channel (308) is controllably connected to or separated from the compression chamber (150). A compressor comprising an unloading device (109) configured to controllably open and close a channel (308), wherein the housing (101) further comprises an unloading device chamber (310) and a cover (315), wherein the unloading device (109) is located within the unloading device chamber (310), wherein the unloading device (109) is configured to open the connection channel (308) at the open position of the unloading device (109), wherein the unloading device (109) is configured to close the connection channel (308) at the closed position of the unloading device (109), wherein the cover (315) comprises a cover channel (380), wherein the cover channel (380) is configured to communicate the unloading device chamber (310) with the exhaust chamber (180) at the open position of the unloading device (109) and at the closed position of the unloading device (109). Claim 2 A compressor according to claim 1, wherein the unloading device (109) is configured such that when the compressor is operated, the unloading device (109) opens the connection channel (308) so that the unloading channel inlet (216) of the unloading channel (208) is opened, thereby allowing the compression chamber (150) to communicate with the intake side of the compressor. Claim 3 A compressor according to claim 1, wherein the end of the unloading device chamber (310) forms the connecting channel (308), and the fabric of the unloading device chamber (310) is closed by the cover (315). Claim 4 A compressor according to claim 3, wherein the unloading device chamber (310) has an unloading device chamber opening (367), and the area of ​​the unloading device chamber opening (367) is larger than the area of ​​the unloading channel inlet (216) of the unloading channel (208). Claim 5 A compressor according to claim 4, wherein the exhaust end (113) of the pair of screw rotors (110) has an exhaust cross-section (118), the unloading device chamber opening (367), the unloading channel inlet (216) of the unloading channel (208), and the exhaust cross-section (118) are in a common plane, and the unloading device chamber opening (367) is configured to overlap at least a portion of the unloading channel inlet (216) of the unloading channel (208) and at least a portion of the exhaust cross-section (118) simultaneously. Claim 6 In claim 3, the unloading device (109) comprises a piston (401) and an elastic device (402), wherein the piston (401) is movable within the unloading device chamber (310), and the elastic device (402) is configured to provide elastic force, and the unloading device (109) is configured to open the connecting channel (308) by moving away from the unloading channel inlet (216) of the unloading channel (208) in response to the pressure applied to the piston (401) being less than the elastic force of the elastic device (402), and the unloading device (109) is configured to close the connecting channel (308) by closing the unloading channel inlet (216) of the unloading channel (208) through the piston (401) in response to the pressure applied to the piston being greater than the elastic force of the elastic device (402), and the pressure is exhaust of the compressor A compressor that is provided by pressure. Claim 7 In claim 6, the piston (401) has a head (411) and a body (412), the diameter of the head (411) is larger than the diameter of the body (412), and the unloading device chamber (310) has a first section (321) and a second section (322), the diameter of the second section (322) is smaller than the diameter of the first section (321), the first section (321) is close to the cover (315), the head (411) is received within the first section (321) and is sealed with the inner wall of the first section (321); one end of the elastic device (402) contacts a stepped surface (333) formed by the first section (321) and the second section (322), and the other end contacts the head (411) of the piston (401), and the elastic A compressor in which the device (402) is configured to provide elastic force so that the piston (401) is configured to move away from the unloading channel inlet (216) of the unloading channel (208) to open the connecting channel (308), and the head (411) of the piston (401) is configured to apply pressure so that the piston (401) is deflected toward the unloading channel inlet (216) of the unloading channel (208) to close the connecting channel (308). Claim 8 A compressor according to claim 4, wherein the unloading device chamber (310) is connected to the exhaust chamber (180) of the compressor through a connecting channel (608, 708), and a throttle element is disposed along the connecting channel (608, 708). Claim 9 A compressor according to claim 8, wherein a buffer device is disposed in the connection channel (608, 708), and the buffer device is disposed between the unloading device chamber (310) and the throttle element. Claim 10 In claim 8, the cover channel (380) is a compressor that forms the throttle element. Claim 11 A compressor according to claim 9, wherein the throttle element and the buffer device are disposed in the housing (101). Claim 12 A compressor according to claim 4, wherein the housing (101) has a housing coupling surface (341) positioned facing the exhaust cross-section (118) of the exhaust end of a pair of screw rotors, an exhaust port (348) is positioned on the housing coupling surface (341), and a constant distance extends between the unloading device chamber opening (367) and the exhaust port (348) in the radial direction. Claim 13 delete

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