Scroll compressor with enhanced vapor injection system

Abstract

The present invention provides a scroll compressor with an enhanced vapor injection system, comprising: a scroll mechanism, a first scroll and a second scroll being engaged with each other so as to form a series of compression chambers therebetween; the enhanced vapor injection connector device is fixed to the vortex mechanism, the enhanced vapor injection connector device comprises a shell, a channel is formed in the shell, a first opening, a second opening and a third opening which are communicated with the channel are formed in the shell, the first opening can be in fluid communication with an enhanced vapor injection system, and the second opening can be in fluid communication with the vortex mechanism. The second opening can be in fluid communication with at least one of the compression cavities, the third opening can be in fluid communication with a low-pressure area in the scroll compressor, and a movable sealing piece is arranged in the channel. The scroll compressor with the enhanced vapor injection system is simple in structure, high in reliability, wide in applicability and low in cost.

Description

Technical Field

[0001] The present invention relates to a scroll compressor, and more particularly, to a variable displacement scroll compressor including a jet enthalpy increase system. Background Art

[0002] Existing ordinary compressor systems for refrigeration / heating (including air conditioners, refrigeration equipment, etc.) generally include a compressor, a condenser, a main throttling device, and an evaporator connected in sequence to form a circulation loop. In, for example, a low-temperature heating condition, in order to achieve an enthalpy increase effect and improve the performance of the compressor, a jet enthalpy increase system is adopted in the prior art. The jet enthalpy increase system generally includes an economizer with a throttling device, which is connected to the gas replenishing port of the compressor to inject a jet enthalpy increase fluid (liquid refrigerant) into at least one compression chamber of the compressor, thereby reducing the exhaust temperature of the scroll compressor and achieving refrigeration / heating under extreme conditions.

[0003] In addition, in order to better adapt to the load requirements of the compressor system, reduce the start-stop of the unit, and improve the energy efficiency of the system, there is also a technology in the prior art to achieve variable displacement without changing the compressor speed and without unloading the scroll mechanism. The compressor adopting this technology includes a capacity regulating mechanism, and the capacity regulating mechanism realizes partial load operation by bypassing at least one compression chamber of the compressor to a low-pressure area.

[0004] However, existing capacity regulating mechanisms usually have a complex structure, a large number of parts, and a high cost. In addition, existing capacity regulating mechanisms usually have more sealing surfaces, resulting in higher processing requirements. In addition, existing capacity regulating mechanisms require additional solenoid valves for control, and the solenoid valves are usually installed inside the compressor, which is likely to cause the whole machine to fail due to the failure of the solenoid valve. In addition, existing capacity regulating mechanisms have insufficient versatility and cannot be compatible with existing scroll designs.

[0005] Therefore, there is a need to improve the capacity regulating mechanism of the scroll compressor. Summary of the Invention

[0006] The object of the present invention is to provide a scroll compressor with a jet enthalpy increase system, which uses the valve of the jet enthalpy increase system to control the opening and closing of the capacity regulating mechanism, simplifies the structure and installation of the capacity regulating mechanism, and reduces the cost.

[0007] Another object of the present invention is to provide a scroll compressor with a jet enthalpy increase system, and the capacity regulating mechanism of the scroll compressor has fewer sealing surfaces, is simple to process, and has high reliability.

[0008] Another object of the present invention is to provide a scroll compressor with an economizer system. The scroll compressor uses a valve of the economizer system to control the opening and closing of a capacity regulating mechanism, thereby realizing the external placement of the control valve of the capacity regulating mechanism, making the maintenance and replacement of parts of the compressor more convenient.

[0009] Yet another object of the present invention is to provide a scroll compressor with an economizer system. The scroll compressor can quickly connect an economizer pipeline to a fixed scroll through an economizer joint device, and can be compatible with existing scroll designs, having higher versatility and interchangeability.

[0010] According to one aspect of the present invention, there is provided a scroll compressor with an economizer system, comprising: a scroll mechanism including a first scroll and a second scroll that mesh with each other to form a series of compression chambers therebetween; and an economizer joint device fixed to the scroll mechanism. The economizer joint device includes a housing within which a channel is formed. The housing has a first opening, a second opening, and a third opening that communicate with the channel. The first opening can be in fluid communication with the economizer system, the second opening can be in fluid communication with at least one of the compression chambers, and the third opening can be in fluid communication with a low-pressure region within the scroll compressor. A movable seal is disposed within the channel and is configured to move between a first position and a second position. In the first position, the movable seal allows the first opening to be in fluid communication with the second opening and prevents the third opening from being in fluid communication with the first opening and the second opening; in the second position, the movable seal allows the second opening to be in fluid communication with the third opening and prevents the first opening from being in fluid communication with the second opening and the third opening.

[0011] Optionally, the economizer system includes a valve configured to switch between a first state and a second state. In the first state, the first opening is supplied with economizer fluid; in the second state, the first opening is not supplied with economizer fluid.

[0012] Optionally, a biasing member is disposed within the channel and biases the movable seal toward the second position.

[0013] Optionally, the biasing member is configured as a spring, and the stiffness of the spring is selected such that: in the case where the valve switches from the first state to the second state, the movable seal moves from the first position to the second position; or in the case where the valve switches from the first state to the second state, the movable seal moves from the first position to an intermediate position between the first position and the second position.

[0014] Optionally, in the second position, the movable seal causes the second opening to be fully open or the movable seal covers a part of the second opening.

[0015] Optionally, at the first position, the movable seal fully opens the second opening or the movable seal covers a part of the second opening.

[0016] Optionally, at the intermediate position, the first opening, the second opening and the third opening are not in fluid communication with each other.

[0017] Optionally, the movable seal is configured to be generally spherical or generally cylindrical.

[0018] Optionally, the movable seal is configured to be generally cylindrical. The movable seal has a hollow channel extending along its axis and at least one exhaust hole transverse to the hollow channel. The hollow channel communicates with the first opening or the third opening, and at least one exhaust hole can communicate the hollow channel with the second opening.

[0019] Optionally, the movable seal includes a central column portion, a first seal portion and a second seal portion located at both ends of the central column portion. A gap channel is formed between the first seal portion and the second seal portion. The first seal portion or the second seal portion includes a through hole communicating with the gap channel. Wherein, the first opening or the third opening can communicate with the second opening through the through hole and the gap channel.

[0020] Optionally, the first seal portion and / or the second seal portion can cover at least a part of the second opening.

[0021] Optionally, the movable seal is configured to be generally cylindrical. An annular sealing ring is installed on the outer peripheral surface of the movable seal, or the outer peripheral surface of the movable seal is formed into a labyrinth sealing surface.

[0022] Optionally, a seal is formed between the movable seal and the inner surface of the housing that defines the channel.

[0023] Optionally, a stop member for preventing the movable seal from disengaging from the third opening is provided at the third opening.

[0024] Optionally, the stop member is formed with a through hole, and the through hole communicates with the low-pressure area via the third opening.

[0025] Optionally, the stop member includes a rod portion inserted into the third opening. A biasing member is arranged around the rod portion. One end of the biasing member abuts against the stop member, and the other end of the biasing member abuts against the movable seal.

[0026] Optionally, the stop member is a bolt. The bolt includes a head and a rod portion. The rod portion is inserted into the channel. A biasing member is arranged around the rod portion. One end of the biasing member abuts against the head, and the other end of the biasing member abuts against the movable seal. Wherein: the head is mounted to abut against the end face of the housing that forms the third opening, and the bolt is formed with a central fluid through hole that penetrates the head and the rod portion along the axial direction of the bolt; or, the head is mounted to form a gap with the end face of the housing that forms the third opening to allow fluid to pass through.

[0027] Optionally, the first scroll includes a first scroll end plate, and at least one communication passage extending from the outer peripheral surface of the first scroll end plate to at least one compression chamber is formed therein. The jet injection enthalpy connection device is mounted such that the second opening is aligned with a port of the at least one communication passage on the outer peripheral surface of the first scroll end plate, so that the second opening is in fluid communication with the at least one compression chamber through the communication passage.

[0028] Optionally, the jet injection enthalpy connection device includes a connection head configured to have a generally cylindrical shape with a central receiving through hole. One end of the connection head is connected to the first opening, and an input fitting of the jet injection enthalpy system or a connection member for connecting to the input fitting of the jet injection enthalpy system is at least partially received in the central receiving through hole from the other end of the connection head.

[0029] In the scroll compressor according to the present invention, the jet injection enthalpy connection device has both a jet injection enthalpy passage and a bypass passage and can control the switching between the jet injection enthalpy passage and the bypass passage through a valve of the jet injection enthalpy system. Thus, on the one hand, the jet injection enthalpy function of the compressor is realized, and on the other hand, the variable displacement function of the compressor is realized; the jet injection enthalpy connection device has a simple structure, is easy to process and assemble, has high reliability, low cost, and can also be widely applied to various variable displacement scroll compressors. Therefore, while improving the energy efficiency of the compressor system, the production, installation, and maintenance costs of the compressor can be effectively controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Through the following description with reference to the drawings, the features and advantages of one or more embodiments of the present invention will become more readily understood. The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. The drawings are not drawn to scale, and some features may be enlarged or reduced to show details of specific components. In the drawings:

[0031] Figure 1 is a longitudinal sectional view of a section of a scroll compressor according to a first embodiment of the present invention;

[0032] Figure 2 is a longitudinal sectional view of another section of the scroll compressor according to the first embodiment of the present invention, mainly showing the scroll member and the components in its vicinity while omitting other components;

[0033] Figure 3 is a cross-sectional view of the scroll compressor according to the first embodiment of the present invention;

[0034] Figure 4a is a longitudinal sectional view of the scroll compressor according to the first embodiment of the present invention in a state where the jet injection enthalpy system is closed, mainly showing the scroll member and the components in its vicinity while omitting other components;

[0035] Figure 4b is a longitudinal sectional view of a scroll compressor according to a first embodiment of the present invention in a state where the jet enthalpy increase system is turned on, mainly showing the scroll member and the components in its vicinity while omitting other components;

[0036] Figure 5 is an exploded perspective view of a jet enthalpy increase joint device of a scroll compressor according to a first embodiment of the present invention;

[0037] Figure 6 is a perspective view of an assembled jet enthalpy increase joint device of a scroll compressor according to a first embodiment of the present invention;

[0038] Figure 7 is an exploded longitudinal sectional view of a jet enthalpy increase joint device of a scroll compressor according to a first embodiment of the present invention;

[0039] Figure 8 is a longitudinal sectional view of a scroll compressor according to a second embodiment of the present invention;

[0040] Figure 9a is a cross-sectional view of a scroll compressor according to a second embodiment of the present invention in a state where the jet enthalpy increase system is turned off;

[0041] Figure 9b is a cross-sectional view of a scroll compressor according to a second embodiment of the present invention in a state where the jet enthalpy increase system is turned on;

[0042] Figure 10 is an exploded perspective view of a jet enthalpy increase joint device of a scroll compressor according to a second embodiment of the present invention;

[0043] Figure 11 is an exploded perspective view of a jet enthalpy increase joint device of a scroll compressor according to a third embodiment of the present invention;

[0044] Figure 12 is a longitudinal sectional view of a movable seal of a jet enthalpy increase joint device of a scroll compressor according to a first modification of a first embodiment of the present invention;

[0045] Figure 13a is an assembled longitudinal sectional view of a jet enthalpy increase joint device of a scroll compressor according to a first modification of a first embodiment of the present invention, where the movable seal is in a first position;

[0046] Figure 13b is an assembled longitudinal sectional view of a jet enthalpy increase joint device of a scroll compressor according to a first modification of a first embodiment of the present invention, where the movable seal is in a second position;

[0047] Figure 14Cross-sectional view of the jet enthalpy injection joint device of a scroll compressor according to the first modification of the second embodiment of the present invention, where the movable seal is in the second position;

[0048] Figure 15 Cross-sectional view of the jet enthalpy injection joint device of a scroll compressor according to the first modification of the third embodiment of the present invention, where the movable seal is in the second position;

[0049] Figure 16 Longitudinal sectional view of the movable seal of the jet enthalpy injection joint device of a scroll compressor according to the second modification of the first embodiment of the present invention;

[0050] Figure 17 Longitudinal sectional view of the movable seal of the jet enthalpy injection joint device of a scroll compressor according to the third modification of the first embodiment of the present invention;

[0051] Figure 18a 、 Figure 18b and Figure 18c Longitudinal sectional view, top view and side view of the movable seal of the jet enthalpy injection joint device of a scroll compressor according to the fourth modification of the first embodiment of the present invention respectively;

[0052] Figure 19a Assembled longitudinal sectional view of the jet enthalpy injection joint device of a scroll compressor according to the fourth modification of the first embodiment of the present invention, where the movable seal is in the second position;

[0053] Figure 19b Assembled longitudinal sectional view of the jet enthalpy injection joint device of a scroll compressor according to the fourth modification of the first embodiment of the present invention, where the movable seal is in the first position;

[0054] Figure 19c Assembled longitudinal sectional view of the jet enthalpy injection joint device of a scroll compressor according to the fourth modification of the first embodiment of the present invention, where the movable seal is in the second position under another operating condition;

[0055] Figure 20a Assembled longitudinal sectional view of the jet enthalpy injection joint device of a scroll compressor according to the second modification of the second embodiment of the present invention, where the movable seal is in the second position;

[0056] Figure 20b Assembled longitudinal sectional view of the jet enthalpy injection joint device of a scroll compressor according to the second modification of the second embodiment of the present invention, where the movable seal is in the first position;

[0057] Figure 20cis an assembled longitudinal sectional view of an injection enthalpy connection device of a scroll compressor according to a second modification of a second embodiment of the present invention, where the movable seal is in a second position under another operating condition; and

[0058] Figure 21 is an assembled longitudinal sectional view of an injection enthalpy connection device of a scroll compressor according to a second modification of a third embodiment of the present invention, where the movable seal is in a second position under another operating condition. Detailed Embodiments

[0059] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The description is merely exemplary and does not limit the present invention and its applications.

[0060] Figure 1 is a longitudinal sectional view of a scroll compressor according to a first exemplary embodiment of the present invention. As Figure 1 shown, the scroll compressor 100 mainly includes a housing 10, a scroll mechanism CM, a main bearing seat 40, a drive shaft 50, a motor 60, etc. The housing 10 generally includes a housing body 14 in a substantially cylindrical shape, a top cover 12, and a bottom cover 16. The housing body 14, the top cover 12, and the bottom cover 16 form a complete housing 10 by, for example, welding, thereby enclosing an internal space for accommodating a series of compressor components such as the scroll mechanism. The housing 10 further includes a partition plate 18, whereby the internal space of the housing 10 is divided into a high-pressure region CH between the top cover 12 and the partition plate 18 and a low-pressure region CL between the partition plate 18 and the bottom cover 16. In this internal space, the scroll mechanism CM is supported by the main bearing seat 40, and the main bearing seat 40 is fixedly connected to the housing 10 or integrally formed with the housing 10 by, for example, riveting. The scroll mechanism CM includes a first scroll (e.g., a fixed scroll) 20 and a second scroll (e.g., a moving scroll) 30. The moving scroll 30 performs a translational rotation relative to the fixed scroll 30 under the drive of the motor 60 and the drive shaft 50. In other words, the axis of the moving scroll 30 rotates around the axis of the fixed scroll 20, but neither the moving scroll 30 nor the fixed scroll 20 rotates around their respective axes.

[0061] The orbiting scroll 30 includes an orbiting scroll end plate 31 and a spiral orbiting scroll blade 32 extending upward from one side of the driven orbiting scroll end plate 31. The fixed scroll 20 includes a fixed scroll end plate 21 and a spiral fixed scroll blade 22 extending downward from one side of the fixed scroll end plate 21. The fixed scroll blade 22 meshes with the orbiting scroll blade 32 to form a series of compression chambers therebetween for compressing a fluid such as a refrigerant. The working fluid enters the low-pressure region CL within the housing 10 via a suction port fitting provided on the housing 10 (usually the housing body 14), is compressed via a series of compression chambers of the scroll mechanism CM, and then leaves the scroll mechanism CM through a central exhaust port in the fixed scroll 20 and enters the high-pressure region CH, and subsequently is discharged outside the scroll compressor 100 through an exhaust port fitting provided on the housing 10 (usually the top cover 12).

[0062] To further improve the performance of the compressor, the scroll compressor 100 according to the present invention is also provided with an economizer system. Specifically, as Figure 1 shown, the scroll compressor 100 includes an economizer connection device 70a, which is mounted to the fixed scroll 20 and can be connected to an input fitting 15 of the economizer system passing through the housing 10 via a connecting member 17, thereby connecting the fixed scroll 20 to the economizer system outside the scroll compressor 100.

[0063] The following will describe the specific structure of the economizer connection device 70a of the scroll compression mechanism according to the first embodiment of the present invention with reference to Figure 5 、 Figure 6 and Figure 7 .

[0064] The economizer connection device 70a includes a housing 701a, and the housing 701a includes a generally cylindrical main body portion 7011a and a mounting portion 7012a extending radially outward from the main body portion 7011a. The radially outermost surface of the mounting portion 7012a forms a mounting surface 781a that abuts against the outer peripheral surface of the fixed scroll end plate 21. The mounting portion 7012a is also formed with a through hole 782a, and by passing a fastener 783a (see Figure 3 ) through the through hole 782a, the economizer connection device 70a can be fixedly mounted to the fixed scroll 20. A channel LP extending along the generally axial direction of the main body portion (in the present embodiment, the generally vertical direction) is formed within the housing 701a (main body portion 7011a). The housing 701a is formed with a first opening 71a, a second opening 72a, and a third opening 73a that communicate with the channel LP, wherein the first opening 71a and the third opening 73a are respectively located at the first end ( Figure 7 shown as the lower end in Figure 7is shown at the upper end). In other words, the passage LP penetrates the housing 701a (main body portion 7011a) so as to form a first opening 71a and a third opening 73a at its first end and second end, respectively. Since the jet injection enthalpy increase joint device 70a is fixedly mounted to the fixed scroll 20 and the jet injection enthalpy increase joint device 70a is disposed in the low-pressure region CL of the scroll compressor 100, the third opening 73a can be in fluid communication with the low-pressure region CL in the scroll compressor 100. The second opening 72a penetrates the mounting portion 7012a and the side wall of the main body portion 7011a, one end of which is formed on the mounting surface 781a and the other end of which is formed on the inner surface of the housing 701 that defines the passage LP.

[0065] A movable seal 76a and a biasing member 75a are disposed in the passage LP. As Figure 5 , 7As shown, the movable seal 76a is configured to be generally spherical, and the biasing member 75a is configured to be a spring, for example. During the assembly of the jet enthalpy boost joint device 70a, the movable seal 76a and the biasing member 75a can be sequentially placed into the passage LP through the third opening 73a, and then the stopper 74a is inserted into the third opening 73a so that the movable seal 76a and the biasing member 75a are installed in place in the passage LP and prevent the movable seal 76a and the biasing member 75a from coming out of the third opening 73a. The stopper 74a may include a rod portion 745a inserted into the third opening 73a. The biasing member 75a is arranged to surround the rod portion 745a. One end of the biasing member 75a abuts against the stopper 74a and the other end abuts against the movable seal 76a. For example, the movable seal 76a is configured as a bolt 74a. The bolt 74a includes a head 743a and a rod portion 745a and is formed with a central fluid through hole (through hole) 742a that penetrates the head 743a and the rod portion 745a along the axial direction of the bolt. When the bolt 74a is installed in place at the third opening 73a, the rod portion 745a is received in the passage LP, and the head 743a is at least partially located outside the passage LP and abuts against the end face of the housing 701a that forms the third opening 73a. A sealing washer 741a may also be installed between the lower surface of the head 743a of the bolt 74a and the end face of the housing 701a that forms the third opening 73a to form a seal. Inside the passage LP, the biasing member 75a is arranged to surround the rod portion 745a. One end of the biasing member 75a abuts against the head 743a of the bolt 743a and the other end abuts against the movable seal 76a, thereby applying a biasing force (in the first embodiment, this biasing force is in the generally vertically downward direction) to the movable seal 76a to bias the movable seal 76a toward the second position (which will be described in detail below). In order to better seal the first opening 71a and limit the movable seal 76a, a seat portion 711a adapted to abut against the bottom surface of the movable seal 76a to form a seal may also be formed at the first end of the passage LP. The seat portion 711a may be configured to have a shape adapted to the shape of the movable seal 75a to enhance the sealing effect. For example, the seat portion 711a projects radially inward from the inner surface of the housing 701a that defines the passage LP and is formed with an inclined surface 7111a that is adapted to contact the movable seal 76a and form a seal. The movable seal 76a can be pressed against the seat portion 711a under the action of its own gravity and the biasing force of the biasing member 75a.

[0066] Preferably, for facilitating the installation and positioning of the biasing member 75a and for forming a more reliable seal at the sealing washer 741a, the head 743a may be configured to include a first head 7431a and a second head 7432a along its axial direction, and a recess 7433a for receiving and installing the sealing washer 741a is formed between the first head 7431a and the second head 7432a. When the bolt 74a is installed in place at the third opening 73a, the first head 7431a is located outside the passage LP and above the end face of the housing 701a forming the third opening 73a, and the second head 7432a is located within the passage LP. One end of the biasing member 75a abuts against the second head and the other end abuts against the movable seal 76a.

[0067] In addition, in some other embodiments, when the bolt 74a is installed in place at the third opening 73a, the head 743a may not abut against the end face of the housing 701a forming the third opening 73a, but form a gap with the end face of the housing 701a forming the third opening 73a that allows fluid to pass through but still prevents the movable seal 76a from escaping. Thus, the fluid in the passage LP can flow into the low-pressure region through the gap between the outer peripheral surface of the rod portion 745a and the inner wall of the passage LP and the gap between the head 743a and the end face of the housing 701a forming the third opening 73a. It can be understood that in this case, the central fluid through-hole 742a of the bolt 74a can be omitted.

[0068] The following refers to Figure 2 and Figure 3 to describe the specific connection structure of the scroll compressor 100 according to the first embodiment of the present invention and the jet enthalpy increase system.

[0069] As described above, the jet enthalpy increase joint device 70a is connected to the input fitting 15 of the jet enthalpy increase system through the connecting member 17. Specifically, the jet enthalpy increase joint device 70a further includes a joint head 702a (see Figure 6 and Figure 7 ), the joint head 702a is configured to have a generally cylindrical shape with a central receiving through-hole 703a. One end of the joint head 702a is connected to the first opening 71a and the central receiving through-hole 703a is in communication with the first opening 71a, and the other end is adapted to receive one end of the connecting member 17 in the central receiving through-hole 703a, so as to be connected to the input fitting 15 of the jet enthalpy increase system through the connecting member 17. The joint head 702a may be configured to be integrally formed with the housing 701a.

[0070] Specifically, referring to Figure 2, for the convenience of assembly, the connecting member 17 can be configured as a hollow DogBone shape. The connecting member 17 has an enlarged first end portion 171 (upper end portion) and a second end portion 172 (lower end portion) opposite to the first end portion 171. The first end portion 171 is connected to the jet enthalpy increase joint device 70a by being inserted into the central accommodation through hole 703a of the joint head portion 702a, and the second end portion 172 is inserted into the accommodation hole formed in the main bearing seat 40. Annular sealing grooves may also be formed at the first end portion 171 and the second end portion 172, and annular sealing rings are assembled in the annular sealing grooves, so as to form a seal at the connection between the connecting member 17 and the main bearing seat 40 and the jet enthalpy increase joint device 70a. A communication channel is also formed in the main bearing seat 40 to communicate the accommodation hole containing the second end portion 172 with the input fitting 15 of the jet enthalpy increase system fixed on the main bearing seat 40. The input fitting 15 of the jet enthalpy increase system is connected to the fluid pipeline of the jet enthalpy increase system outside the scroll compressor 100. Thus, the first opening 71a of the channel LP can be in fluid communication with the fluid pipeline of the jet enthalpy increase system via the central accommodation through hole 703a of the joint head portion 702a, the central hole of the connecting member 17, the communication channel in the main bearing seat 40, and the input fitting 15.

[0071] As described above, the jet enthalpy increase joint device 70a is fixedly installed on the fixed scroll 20 through the installation portion 7012a. At least one bypass channel 23 is formed in the fixed scroll end plate 21 of the fixed scroll 20, and the at least one bypass channel 23 extends from the outer peripheral surface of the fixed scroll end plate 21 to at least one compression chamber C among a series of compression chambers. As Figure 2 and Figure 3 shown, the bypass channels 23 are, for example, two communication channels, and each communication channel includes a horizontal portion extending substantially along the radial direction of the compressor and a vertical portion 24 extending substantially along the axial direction of the compressor. Among them, the horizontal portions of the two bypass channels 23 meet at the outer peripheral surface of the fixed scroll end plate 21 and form ports on the outer peripheral surface of the fixed scroll end plate 21, and the two vertical portions 24 of the two bypass channels 23 are respectively connected to two compression chambers. Preferably, the two compression chambers are substantially symmetric about the center of the scroll mechanism CM to facilitate the balance and stable operation of the scroll mechanism CM. Of course, those skilled in the art can understand that the bypass channel 23 can also be formed as only one or more than two and communicate with one or more than two compression chambers. The jet enthalpy increase joint device 70a is installed such that the second opening 72a is aligned with the port on the outer peripheral surface of the fixed scroll end plate 21 where the bypass channel 23 is located and forms a sealed connection, so as to fluidly communicate the second opening 72a with at least one compression chamber C through the bypass channel 23.

[0072] The following refers to Figure 4a and Figure 4b to describe the capacity adjustment process of the scroll compressor 100 according to the first embodiment of the present invention.

[0073] The jet enthalpy increase system includes a valve (such as a solenoid valve, not shown in the figure). The valve is configured to switch between a first state (open state) and a second state (closed state). As Figure 4b shown, when the valve is in the first state, the pipeline of the jet enthalpy increase system is opened, and the jet enthalpy increase fluid enters the input fitting 15 and is conveyed to the scroll compressor 100. Subsequently, it flows through the communication channel in the main bearing housing 40 and the central through hole of the connecting member 17 in sequence and is supplied to the first opening 71a of the jet enthalpy increase joint device 70a. Under the action of the pressure of the jet enthalpy increase fluid, the movable seal 76a overcomes its own gravity, the biasing force of the biasing member 75a, and the gas pressure in the low-pressure area in the scroll compressor and moves in a direction away from the first opening 71a (in Figure 4a , Figure 4b it is the upward direction). The movable seal 76a moves away from the first opening 71a until its first position. At this first position, the movable seal 76a allows the first opening 71a to be in fluid communication with the second opening 72a, while preventing the third opening 73a from being in fluid communication with the first opening 71a and the second opening 72a. Preferably, as Figure 4b shown, this first position may refer to the position where the movable seal 76a contacts the lower end of the bolt 74a, so as to easily maintain the stability of the movable seal 76a. However, those skilled in the art can understand that at this first position, the movable seal 76a may not contact the lower end of the bolt 74a, but is at a position where the forces on the movable seal 76a reach equilibrium, that is, at a position where the pressure of the jet enthalpy increase fluid balances the sum of the self-gravity of the movable seal 76a, the biasing force of the biasing member 75a, and the gas pressure in the low-pressure area in the scroll compressor (frictional force, etc. are ignored). Thus, the jet enthalpy increase fluid supplied to the first opening 71a can flow to the second opening 72a via the channel LP. Since the second opening 72a is aligned with the port on the outer peripheral surface of the fixed scroll end plate 21 of the bypass channel 23 in the fixed scroll end plate 21 and forms a sealed connection, the jet enthalpy increase fluid flows out of the second opening 72a and enters the bypass channel 23, and finally flows into the compression chamber C via the bypass channel 23, thereby inputting the jet enthalpy increase fluid to the scroll mechanism CM. In other words, when the valve of the jet enthalpy increase system is in the first state, the input fitting 15, the connecting member 17, the fluid channel from the first opening 71a to the second opening 72a in the jet enthalpy increase joint device 70a, and the bypass channel 23 in the fixed scroll end plate together constitute the input path of the jet enthalpy increase fluid, so as to convey the jet enthalpy increase fluid from the jet enthalpy increase system to at least one compression chamber C of the scroll mechanism to achieve the enthalpy increase effect. At the same time, the jet enthalpy increase joint device 70a also avoids the leakage of the jet enthalpy increase fluid by preventing the third opening 73a from being in fluid communication with the first opening 71a and the second opening 72a.

[0074] As Figure 4a shown, when the valve is in the second state, the pipeline of the jet enthalpy increase system is closed, and the first opening 71a of the jet enthalpy increase joint device 70a is not supplied with the jet enthalpy increase fluid. The movable seal 76a moves in the direction of the first opening 71a (downward in Figure 4a , 4b ) against the pressure in the pipeline of the jet enthalpy increase system under the action of its own gravity, the biasing force of the biasing member 75a, and the gas pressure in the low-pressure area in the scroll compressor, and the movable seal 76a moves away from the third opening 73a until its second position. At this second position, the movable seal 76a allows the second opening 72a to be in fluid communication with the third opening 73a while preventing the first opening 71a from being in fluid communication with the second opening 72a and the third opening 73a. Preferably, this second position may refer to the position where the movable seal 76a contacts the seat portion 711a at the first opening 71a, so as to easily maintain the stability of the movable seal 76a and strengthen the seal against the first opening 71a. However, those skilled in the art can understand that the seat portion 711a can also be omitted, or at this second position, the movable seal 76a may not contact the seat portion 711a, but is in a position where the forces acting on the movable seal 76a are balanced, that is, at a position where the sum of the self-gravity of the movable seal 76a, the biasing force of the biasing member 75a, and the gas pressure in the low-pressure area CL of the scroll compressor is balanced with the pressure inside the pipeline of the jet enthalpy increase system (friction force, etc. are ignored). Thus, since the gas pressure in the compression chamber C is greater than the pressure in the low-pressure area CL of the scroll compressor, the working fluid in the compression chamber C flows out of the scroll mechanism CM from the port of the bypass passage 23 located on the outer peripheral surface of the fixed scroll end plate 21 through the bypass passage 23 in the fixed scroll end plate 21 and is supplied to the second opening 72a, then flows into the passage LP in the jet enthalpy increase joint device 70a from the second opening 72a, and finally is discharged from the third opening 73a through the central fluid through-hole 742a of the bolt 74b to the low-pressure area CL of the scroll compressor. In other words, when the valve of the jet enthalpy increase system is in the second state, the bypass passage 23 in the fixed scroll end plate and the fluid passage from the second opening 72a to the third opening 73a in the jet enthalpy increase joint device 70a together constitute a bypass path of the compression chamber, so as to discharge the working fluid from at least one compression chamber C to the low-pressure area CL of the scroll compressor, thereby realizing the capacity adjustment (reducing the displacement) of the scroll mechanism. At the same time, the jet enthalpy increase joint device 70a also avoids the leakage of the working fluid towards the pipeline of the jet enthalpy increase system by preventing the first opening 71a from being in fluid communication with the second opening 72a and the third opening 73a.

[0075] The scroll compressor according to the first embodiment of the present invention does not require an additional solenoid valve. It directly uses the solenoid valve of the jet enthalpy increase system to control the capacity adjustment mechanism. The structure and working principle are simpler, reducing the complexity of the system. System manufacturers can update the original control program to achieve scroll displacement adjustment, reducing the R & D cycle and difficulty of new products. In addition, since the solenoid valve is placed outside the scroll compressor, it is more convenient for maintenance and replacement. The new components installed inside the compressor (such as the jet enthalpy increase joint device) are of a pure mechanical structure and have higher reliability. Moreover, the new components installed inside the compressor have a simple structure, fewer parts, and because they have fewer sealing surfaces and lower requirements for the machining of sealing surfaces, they are easier to install, more reliable in operation, and lower in cost. In addition, the design according to the first embodiment of the present invention is compatible with the existing scroll designs both in terms of structure and control logic, and does not require a new design for the scroll. Existing scrolls can be installed with new components such as the jet enthalpy increase joint device, with higher universality and interchangeability.

[0076] On the other hand, in the existing scroll compressor with jet enthalpy increase and capacity adjustment, since the jet enthalpy increase and capacity adjustment are controlled by different solenoid valves respectively, multiple working modes of the compressor system can be provided, including the simultaneous opening of the jet enthalpy increase and capacity adjustment functions, the opening of one of the jet enthalpy increase and capacity adjustment functions while the other is closed, and the simultaneous closing of the jet enthalpy increase and capacity adjustment functions. However, in actual working conditions, for example, when the cooling capacity needs to be increased (for example, when the compressor needs to work at 120% of the displacement), the jet enthalpy increase function is turned on, and at the same time, the capacity adjustment function itself needs to be turned off to avoid affecting the increase in cooling capacity. Another example is when the compressor needs to work at a partial displacement (for example, 70% of the displacement), the capacity adjustment function is turned on, and at the same time, the jet enthalpy increase function itself needs to be turned off. Therefore, although the scroll compressor according to the first embodiment of the present invention only provides two working modes of the compressor system in which one of the jet enthalpy increase and capacity adjustment functions is turned on while the other is turned off, these two modes can provide, for example, 120% of the compressor displacement when the cooling capacity needs to be increased, and 70% of the compressor displacement when the cooling capacity needs to be reduced, which is sufficient to meet the requirements of actual working conditions.

[0077] Although in the first embodiment of the present invention, when the solenoid valve of the jet enthalpy increase system is switched from the first state to the second state, the movable seal 76a can move to the second position under the action of its own gravity, the biasing force of the biasing member 75a, and the gas pressure in the low-pressure region CL in the compressor. However, those skilled in the art can understand that by selecting biasing members of different specifications, the final position where the movable seal 76a stays can be adjusted to meet different requirements. For example, during the operation of the compressor system, the solenoid valve of the jet enthalpy increase system is opened, and the movable biasing member 75a is lifted. Subsequently, the solenoid valve of the jet enthalpy increase system is closed. Since there is a certain pressure in the pipeline of the jet enthalpy increase system, there is still a pressure at the first opening 71a to lift the movable seal 76a. The elastic force (stiffness) of the biasing member 75a constructed as a spring can be specially designed and selected such that the sum of the self-gravity of the movable seal 76a, the elastic force of the spring, and the gas pressure in the low-pressure region CL in the compressor is not sufficient to overcome the pipeline pressure of the jet enthalpy increase system to cause the movable seal 76a to return to its second position, but reaches a force balance when staying at an intermediate position between the first position and the second position. At this intermediate position, the first opening 71a, the second opening 72a, and the third opening 73a are not in fluid communication with each other. That is to say, this intermediate position is the position corresponding to the second opening 72a, especially the position corresponding to the end formed on the inner surface of the housing 701 that defines the channel LP of the second opening 72a. When the movable seal stays at this intermediate position, the movable seal 76a can completely close this end of the second opening 72a (for example, the diameter of the movable seal 76a is greater than or equal to the diameter of this end). At this time, the first opening 71a, the second opening 72a, and the third opening 73a are not in fluid communication with each other.

[0078] In the case where the movable seal 76a has a first position and an intermediate position, when the solenoid valve of the jet enthalpy increase system is opened, the jet enthalpy increase function is turned on, the capacity adjustment function is turned off, and the compressor provides a displacement of, for example, 120%; when the solenoid valve of the jet enthalpy increase system is closed, the jet enthalpy increase function is turned off, the capacity adjustment function is still turned off, and the compressor provides a displacement of 100%. In other words, by selecting different biasing members, two different control logics can be achieved, namely, the jet enthalpy increase function and the capacity adjustment function can be turned off simultaneously, and one of the jet enthalpy increase function and the capacity adjustment function is always turned on.

[0079] Although in the first embodiment according to the present invention, the jet enthalpy increase joint device is configured to be connected to the input fitting 15 of the jet enthalpy increase system through the connecting member 17 and the main bearing seat 40, those skilled in the art can understand that the structure and connection method of the jet enthalpy increase joint device are not limited thereto.

[0080] The following refers to Figures 8 to 10A description is given of a second exemplary embodiment according to the present invention. The scroll compressor and the jet enthalpy boost system according to the second embodiment of the present invention have substantially the same structure and operating principle as the first embodiment, and will not be described herein again. The difference lies in that, in this second embodiment, the jet enthalpy boost joint device 70c is configured as a direct insertion type.

[0081] Specifically, as Figure 10 shown, the jet enthalpy boost joint device 70c includes a housing 701c, and the housing 701c includes a main body portion 7010c having a substantially cylindrical (e.g., square cylindrical) shape. The main body portion 7010c has a first side wall 7011c and a second side wall 7012c opposite to each other, a third side wall 7013c and a fourth side wall 7014c opposite to each other, and a fifth side wall 7015c and a sixth side wall 7016c opposite to each other. Among them, the outer surface of the second side wall 7012c can be used as a mounting surface that abuts against the outer peripheral surface of the fixed scroll end plate 21. Through holes 782c are formed at the four corners of the first side wall 7011c, and through holes corresponding to the through holes 782c are formed at the four corners of the second side wall 7012c. By passing a fastener 783c through the through holes 782c and the through holes corresponding to the through holes 782c of the second side wall 7012c, the jet enthalpy boost joint device 70c can be fixedly mounted to the fixed scroll 20.

[0082] The jet enthalpy boost joint device 70c further includes a joint portion 702c protruding outward from one side wall of the main body portion 7010c (shown as the first side wall 7011c in Figure 10 ). The joint portion 702c is configured in a substantially cylindrical shape and its axis is substantially perpendicular to the first side wall 7011c of the main body portion 7010c. A channel LP is formed in the main body portion 7010c and extends in a substantially horizontal direction from the fifth side wall 7015c toward the sixth side wall 7016c. The housing 701c is formed with a first opening 71c, a second opening 72c, and a third opening 73c that communicate with the channel LP, wherein the first opening 71c and the second opening 72c are respectively formed on the opposite first side wall 7011c and second side wall 7012c, the first opening 71c communicates with the central accommodation through hole of the joint portion 702c, and the third opening 73 is located on the fifth side wall 7015c. Since the jet enthalpy boost joint device 70c is fixedly mounted to the fixed scroll 20 and the jet enthalpy boost joint device 70c is disposed in the low-pressure region CL of the scroll compressor, the third opening 73c can be in fluid communication with the low-pressure region CL in the scroll compressor 100.

[0083] A movable seal 76c and a biasing member 75c are provided in the passage LP. Similar to the first embodiment, the movable seal 76c can be configured to be substantially spherical, and the biasing member 75c is configured as a spring, for example. An installation port communicating with the passage LP may also be formed on the sixth side wall 7016c of the main body portion 7010c opposite to the fifth side wall 7015c where the third opening 73c is formed. During the assembly of the jet enthalpy connection device 70c, the biasing member 75c and the movable seal 76c can be sequentially placed into the passage LP through this installation port, and then the plug 74c is inserted into this installation port so that the biasing member 75c and the movable seal 76c are installed in place in the passage LP. A stop portion (positioning member) protruding toward the passage LP is also formed at the fifth side wall 7015c where the third opening 73c is formed to prevent the biasing member and the movable seal from coming out of the third opening. The stop portion is formed with a through hole at the center and the through hole communicates with the third opening 73c (the through hole can be formed integrally with the third opening 73c). When the plug 74c is installed in place at this installation port, one end of the biasing member 75c abuts against the movable seal 76c and the other end abuts against the stop portion at the fifth side wall 7015. The biasing member 75c applies a biasing force to the movable seal 76c (in the second embodiment shown in Figure 9a , Figure 9b , this biasing force is in a substantially horizontally upward direction). The movable seal 76c abuts against the end face of the plug 74c located in the passage LP under the action of the biasing force.

[0084] Preferably, the jet enthalpy connection device 70c is configured such that when the plug 74c, the movable seal 76c, and the biasing member 75c are installed in place, the center of the first opening 71c is closer to the plug 74c than the center of the movable seal 76c in the axial direction of the passage LP, so that the movable seal 76c is more likely to move under the action of the jet enthalpy fluid.

[0085] Next, with reference to Figure 8 , Figure 9a and Figure 9b , the specific connection structure of the scroll compressor and the jet enthalpy system according to the second embodiment of the present invention will be described.

[0086] As described above, the jet - enhanced enthalpy connection device 70c is configured as a direct - plug type. That is, the connection part 702c of the jet - enhanced enthalpy head device 10c is configured to be adapted to receive at least a part of the input fitting 15c of the jet - enhanced enthalpy system. In other words, the input fitting 15c is configured in a "plug" type, and one end thereof can pass through the housing of the scroll compressor and be inserted into the central receiving through - hole of the connection part 702c and be fixed in place. Seals can be provided at the joints of the input fitting 15c with the housing of the compressor and the jet - enhanced enthalpy connection device 70c for sealing. Thus, the first opening 71c of the passage LP can be in fluid communication with the pipeline of the jet - enhanced enthalpy system via the central receiving through - hole of the connection part 702c and the passage in the input fitting 15.

[0087] As Figure 9a and Figure 9b shown, similar to the first embodiment according to the present invention, at least one bypass passage 23 is formed in the fixed scroll end - plate 21 of the fixed scroll 20, which extends from the outer peripheral surface of the fixed scroll end - plate 21 to at least one of a series of compression chambers. The jet - enhanced enthalpy connection device 70c is installed such that the second opening 72c is aligned with the port of the bypass passage 23 on the outer peripheral surface of the fixed scroll end - plate 21 and forms a sealed connection, so that the second opening 72c is in fluid communication with at least one compression chamber C through the bypass passage 23. To form the sealed connection, preferably, a sealing gasket 704c is also installed between the mounting surface of the jet - enhanced enthalpy connection device 70c and the outer peripheral surface of the fixed scroll end - plate 21 (see Figure 10 ), and the sealing gasket 704c is formed with a through - hole 7042c at a position corresponding to the second opening 72c for fluid - communicating the second opening 72c with the port of the bypass passage 23.

[0088] Next, with reference to Figure 9a and Figure 9b the capacity adjustment process of the scroll compressor according to the second embodiment of the present invention will be described.

[0089] As Figure 9b shown, when the valve of the jet - enhanced enthalpy system is in the first state (open), the pipeline of the jet - enhanced enthalpy system is open, and the jet - enhanced enthalpy fluid enters the input fitting 15c and is supplied to the first opening 71c of the jet - enhanced enthalpy connection device 70c. Under the action of the pressure of the jet - enhanced enthalpy fluid, the movable seal 76c overcomes the biasing force of the biasing member 75c and the gas pressure in the low - pressure region CL in the scroll compressor and moves in a direction away from the first opening 71c (in Figure 9a , Figure 9bIt moves in the downward direction (the direction shown in the figure). The movable seal 76c moves towards the third opening 73c until it reaches its first position. At this first position, the movable seal 76c allows the first opening 71c to be in fluid communication with the second opening 72c, while preventing the third opening 73c from being in fluid communication with the first opening 71c and the second opening 72c. Those skilled in the art can understand that at this first position, the position where the pressure of the jet enthalpy increase fluid acting on the movable seal 76c reaches equilibrium with the biasing force of the biasing member 75c and the gas pressure in the low-pressure area within the scroll compressor (frictional forces, etc. are ignored). Thus, the jet enthalpy increase fluid supplied to the first opening 71c can flow through the passage LP to the second opening 72c, then flow out from the second opening 72c into the bypass passage 23, and finally flow into the compression chamber C through the bypass passage 23, thereby inputting the jet enthalpy increase fluid to the scroll mechanism CM. In other words, when the valve of the jet enthalpy increase system is in the first state, the input fitting 15c of the jet enthalpy increase system, the fluid passage from the first opening 71c to the second opening 72c within the jet enthalpy increase joint device 70c, and the bypass passage 23 within the stationary scroll end plate together constitute the input path of the jet enthalpy increase fluid, so as to transport the jet enthalpy increase fluid from the jet enthalpy increase system to at least one compression chamber C of the scroll mechanism to achieve the enthalpy increase effect. At the same time, the jet enthalpy increase joint device 70c also avoids the leakage of the jet enthalpy increase fluid by preventing the third opening 73c from being in fluid communication with the first opening 71c and the second opening 72c.

[0090] As Figure 9a shown, when the valve is in the second state (closed), the pipeline of the jet enthalpy increase system is closed, and the first opening 71c of the jet enthalpy increase joint device 70c is not supplied with the jet enthalpy increase fluid. The movable seal 76c moves in the direction of the first opening 71c (in the direction shown in the figure) against the pressure in the pipeline of the jet enthalpy increase system under the action of the biasing force of the biasing member 75c and the gas pressure in the low-pressure area within the scroll compressor. Figure 9a 、 9b(where the middle indicates the upward direction), the movable seal 76c moves away from the third opening 73c until its second position. In this second position, the movable seal 76c allows the second opening 72c to be in fluid communication with the third opening 73c while preventing the first opening 71c from being in fluid communication with the second opening 72c and the third opening 73c. Preferably, this second position may refer to the position where the movable seal 76c contacts the plug 74c, thus facilitating the maintenance of the stability of the movable seal 76c. However, those skilled in the art can understand that at this second position, the movable seal 76c may not contact the plug 74c, but is at a position where the forces acting on the movable seal 76c are balanced, that is, at a position where the sum of the biasing force acting on the movable seal 76c and the gas pressure in the low-pressure region CL of the scroll compressor is balanced with the pressure inside the pipeline of the jet enthalpy increase system (friction force, etc. are ignored). Thus, the working fluid in the compression chamber C is supplied to the second opening 72c via the bypass passage 23 in the fixed scroll end plate 21, then flows into the passage LP in the jet enthalpy increase joint device 70c from the second opening 72c, and finally is discharged to the low-pressure region CL of the scroll compressor through the third opening 73c. In other words, when the valve in the jet enthalpy increase system is in the second state, the bypass passage 23 in the fixed scroll end plate and the fluid passage from the second opening 72c to the third opening 71c in the jet enthalpy increase joint device 70c together constitute a bypass path for the compression chamber, thereby discharging the working fluid from at least one compression chamber C to the low-pressure region CL of the scroll compressor, thus achieving the capacity adjustment (reducing the displacement) of the scroll mechanism. At the same time, the jet enthalpy increase joint device 70c also prevents the working fluid from leaking towards the pipeline of the jet enthalpy increase system by preventing the first opening 71c from being in fluid communication with the second opening 72c and the third opening 73c.

[0091] In addition to having similar advantages to the first embodiment, the scroll compressor according to the second embodiment of the present invention also has a plug-in design for its jet enthalpy increase joint device, which makes the connection between the jet enthalpy increase system and the compressor easier and more convenient, and is more conducive to maintenance and replacement.

[0092] Although the jet enthalpy increase joint device 70c is configured to include a plug 74c in the second embodiment of the present invention, the structure of the jet enthalpy increase joint device is not limited thereto. The following will refer to Figure 11A description is given of a third embodiment according to the present invention. In the third embodiment according to the present invention, similar to the second embodiment, the jet enthalpy increase joint device 70d includes a housing 701d, and the housing 701d includes a substantially cylindrical (e.g., square cylindrical) main body portion 7010d. The main body portion 7010d has a first side wall 7011d and a second side wall 7012d opposite to each other, a third side wall 7013d and a fourth side wall 7014d opposite to each other, and a fifth side wall 7015d and a sixth side wall 7016d opposite to each other. Among them, the outer surface of the second side wall 7012d can be used as a mounting surface that abuts against the outer peripheral surface of the fixed scroll end plate 21. Through holes 782d are formed at the four corners of the first side wall 7011d, and through holes corresponding to the through holes 782d are formed at the four corners of the second side wall 7012d. By passing fasteners 783d through the through holes 782d and the through holes corresponding to the through holes 782d on the second side wall 7012d, the jet enthalpy increase joint device 70d can be fixedly mounted to the fixed scroll 20.

[0093] The jet enthalpy increase joint device 70d further includes a joint portion 702d that protrudes outward from one side wall of the main body portion 7010d (shown as the first side wall 7011d in Figure 11 ). The joint portion 702d is configured in a substantially cylindrical shape and its axis is substantially perpendicular to the first side wall 7011d of the main body portion 7010d. A channel LP is formed in the main body portion 7010d and extends in a substantially horizontal direction from the fifth side wall 7015d toward the sixth side wall 7016d. The housing 701d is formed with a first opening 71d, a second opening, and a third opening 73d that communicate with the channel LP. Among them, the first opening 71d and the second opening are respectively formed on the opposite first side wall 7011d and second side wall 7012d. The first opening 71d communicates with the central accommodation through hole of the joint portion 702d, while the third opening 73d is located on the fifth side wall 7015d. Since the jet enthalpy increase joint device 70d is fixedly mounted to the fixed scroll 20 and the jet enthalpy increase joint device 70d is disposed in the low-pressure region CL of the scroll compressor, the third opening 73d can be in fluid communication with the low-pressure region CL in the scroll compressor 100.

[0094] A movable seal 76d and a biasing member 75d are provided in the passage LP. Similar to the second embodiment, the movable seal 76d can be configured as a substantially spherical shape, and the biasing member 75d is configured as a spring, for example. Different from the second embodiment, the sixth side wall 7016c of the main body 7010d opposite to the fifth side wall 7015c formed with the third opening 73d is completely closed, and the third opening 73d is used as an installation port for installing the movable seal 76d and the biasing member 75d. Specifically, during the assembly process of the injection enthalpy joint device 70d, the movable seal 76d and the biasing member 75d are sequentially placed in the passage LP through the third opening 73d, and then the stopper (a bolt in this embodiment) 74d is inserted into the third opening 73d so that the movable seal 76d and the biasing member 75d are installed in place in the passage LP and prevent the movable seal 76d and the biasing member 75d from coming out of the third opening 73d. The bolt 74d includes a head 743d and a rod 745d and is formed with a central fluid through hole (through hole) 742d that penetrates the head 743d and the rod 745d along the axial direction of the bolt. When the bolt 74d is installed in place at the third opening 73d, the rod 745d is accommodated in the passage LP, and the head 743d is at least partially located outside the passage LP and abuts against the outer surface of the fifth side wall 7015d of the housing 701d. A sealing gasket 741d may also be installed between the lower surface of the head 743d of the bolt 74d and the outer surface of the fifth side wall 7015d to form a seal. In the channel LP, the biasing member 75d is arranged around the rod portion 745d, with one end of the biasing member 75d abutting against the head 743d of the bolt 743d and the other end abutting against the movable seal 76d, thereby applying a biasing force to the movable seal 76d, so that the movable seal 76d is biased to a position (second position) against the sixth side wall 7016d when the pipeline of the injection enthalpy increase system is closed.

[0095] Preferably, in order to facilitate installation and positioning of the biasing member 75d and to form a more reliable seal at the sealing gasket 741d, the head 743d may be configured to include a first head 7431d and a second head 7432d along its axial direction, and a recess 7433d for positioning and installing the sealing gasket 741d is formed between the first head 7431d and the second head 7432d. When the bolt 74d is installed in place at the third opening 73d, the first head 7431d is located outside the passage LP and at the outer surface of the fifth side wall 7015d, the second head 7432d is located inside the passage LP, and one end of the biasing member 75d abuts against the second head 7432d and the other end abuts against the movable seal 76d.

[0096] Those skilled in the art can understand that although in the above description of the first to third embodiments of the present invention, the movable seal is configured to be substantially spherical, the movable seal can also be configured in other shapes. For example, referring to the first variant of the first embodiment of the present invention as shown in Figure 12 , Figure 13a and Figure 13b , the movable seal 76b is configured to be substantially cylindrical.

[0097] In the first variant of the first embodiment, the jet enthalpy increase joint device 70b has substantially the same structure, connection relationship, and control logic as the jet enthalpy increase joint device 70a in the first embodiment, which will not be elaborated here. The jet enthalpy increase joint device 70b includes a housing 701b and a joint part 702b. The housing 701b includes a main body part 7011b formed with a substantially vertical channel LP, and a movable seal 76b and a biasing member 75b are installed in the channel LP. Among them, the diameter of the movable seal 76b is basically equal to or slightly smaller than the diameter of the channel LP. Preferably, referring to Figure 12 , in order to enhance the sealing effect, the lower surface of the movable seal 76b includes a central horizontal part 762b and a cutting part 761b located at the connection between the lower surface and the outer peripheral surface of the movable seal 76b. The cutting part 761b is inclined upward compared with the horizontal part 762b. The shape of the cutting part 761b matches the shape of the inclined surface 7111b of the seat part 711b at the first opening 71b, and the cutting part 761b is adapted to form a contact seal with the inclined surface 7111b of the seat part 711b when the movable seal 76b is in the second position.

[0098] In addition, the substantially cylindrical movable seal is also beneficial for adjusting the jet enthalpy increase flow rate or the bypass flow rate according to different working conditions. Specifically, as shown in Figure 13a , during the operation of the compressor system, when the solenoid valve of the jet enthalpy increase system is opened, under the action of the pressure of the jet enthalpy increase fluid, the movable seal 76b is pushed up against its own gravity, the biasing force of the biasing member 75b, and the gas pressure in the low-pressure area in the scroll compressor until the movable seal 76b reaches above the end 721b of the second opening 72b formed on the inner surface of the housing defining the channel LP (the first position), so that the second opening 72b is completely opened. At this time, the first opening 71a is communicated with the second opening 72b to open the jet enthalpy increase path, and since the second opening 72b is completely opened, the flow area of the jet enthalpy increase path reaches the maximum allowable flow area.

[0099] As shown in Figure 13bAs shown, when the solenoid valve of the jet enthalpy increase system is closed, the movable seal 76b moves towards the direction of the first opening 71a (downward in Figure 13b in this case) against the pressure in the pipeline of the jet enthalpy increase system under the action of its own gravity, the biasing force of the biasing member 75b, and the gas pressure in the low-pressure area within the scroll compressor until it reaches its second position. Due to different operating conditions, the pressure in the low-pressure area within the compressor varies, and the second position of the movable seal 76b may not be the position where the movable seal 76b presses against the seat portion 711b and fully opens the second opening 72b as shown in the first embodiment of the present invention, but as shown in Figure 13b , it is a position located above the seat portion 711b without contacting the seat portion 711b, and the second opening 72b is partially opened and partially covered. That is to say, in the example shown in Figure 13b , when the movable seal 76b stays at this second position, the lower part of the end portion 721b of the second opening 72b (the part closer to the first opening 71b in the longitudinal axis direction of the passage LP) is covered by the movable seal 76b and the upper part is open (the proportion of the open area to the total area of the end portion of the second opening can be designed as needed). At this time, the first opening 71b and the second opening 72b are not in fluid communication, while the second opening 72b and the third opening 73b are in fluid communication to open the bypass path. However, since the second opening 72b is only partially opened, it can be understood that the movable seal 76b covers a part of the second opening 72b, thereby reducing the flow area of the bypass path. Therefore, different variable displacement requirements can be met. In addition, since the movable seal 76b is configured to be substantially cylindrical, by controlling the second position of the movable seal 76b, the flow area of the bypass path can be more accurately controlled to control the bypass amount, which is beneficial for the compressor displacement design for different operating conditions.

[0100] Similarly, those skilled in the art can understand that according to the pressure of the provided jet enthalpy increase fluid, the first position of the movable seal may also not be the position where the second opening 72b is fully opened, but a position where the movable seal covers a part of the second opening 72b (more precisely, the upper part of the end portion 721b of the second opening 72b and only allows the lower part of the end portion 721b to be open). In this case, when the jet enthalpy increase system is turned on, the second opening 72b and the third opening 73b are not in fluid communication, while the first opening 71b and the second opening 72b are in fluid communication to open the jet enthalpy increase path. However, since the second opening 72b is only partially opened, it can be understood that the movable seal 76b covers a part of the second opening 72b, thereby reducing the flow area of the jet enthalpy increase path. Therefore, different jet enthalpy increase requirements can be met.

[0101] Preferably, in order to enhance the sealing effect of the movable seal, as shown in Figure 16In the second variant of the first embodiment according to the present invention as shown, the generally cylindrical movable seal 76b1 may further include a seal ring groove 762b1 formed on the outer peripheral surface of the movable seal, and an annular sealing ring 763b1 is also installed in the seal ring groove 762b1, so that a contact seal is formed between the outer peripheral surface of the movable seal 76b1 and the inner surface of the housing of the jet enthalpy boost joint device that defines the passage LP. Additionally or alternatively, in as Figure 17 In the third variant of the first embodiment according to the present invention as shown, the outer peripheral surface of the generally cylindrical movable seal 76b2 may also be formed as a labyrinth seal surface, that is, at least a part of the outer peripheral surface of the movable seal 76b2 is formed with a labyrinth seal 762b2, so that a contact seal is formed between the outer peripheral surface of the movable seal 76b2 and the inner surface of the housing of the jet enthalpy boost joint device that defines the passage LP. This type of movable seal 76b1, 76b2 is particularly suitable for the case where the first position / second position of the movable seal corresponds to a part of the movable seal covering end 721b, or the biasing member is selected such that when the solenoid valve switches from the first state to the second state, the movable seal member moves from the first position to the intermediate position.

[0102] In addition, those skilled in the art can understand that the features of the first to third variants of the first embodiment of the present invention are also equally applicable to the second and third embodiments of the present invention.

[0103] For example, Figure 14 A first variant of the second embodiment according to the present invention is shown. In this variant, the jet enthalpy boost joint device 70c1 has substantially the same structure, connection relationship, and control logic as the jet enthalpy boost joint device 70c in the second embodiment, which will not be elaborated here. The jet enthalpy boost joint device 70c1 includes a housing 701c1, and the housing 701c1 includes a main body portion 7010c1 formed with a substantially horizontal passage LP. The jet enthalpy boost joint device 70c1 further includes a joint portion 702c1 protruding outward from one side wall of the main body portion 7010c1. A movable seal 76c1 and a biasing member 75c1 are installed in the passage LP. The housing 701c1 is formed with a first opening 71c1, a second opening 72c1, and a third opening 73c1 that communicate with the passage LP, wherein the first opening 71c1 and the second opening 72c1 are respectively formed on opposite first and second side walls of the housing 701c1, the first opening 71c1 communicates with the central receiving through hole of the joint portion 702c1 so as to be able to communicate with the jet enthalpy boost system, and the third opening 73c1 is located on the fifth side wall connecting the first side wall and the second side wall so as to be able to communicate with the low-pressure region in the compressor.

[0104] In particular, the movable seal 76c1 is configured to be generally cylindrical and has a second position that causes the bypass path to be partially opened (or the flow area of the bypass path is a part of the maximum allowable flow area). As Figure 14 shown, when the solenoid valve of the jet enthalpy increase system is closed, the movable seal 76c1 moves in the direction of the first opening 71c1 against the pressure in the pipeline of the jet enthalpy increase system under the biasing force of the biasing member 75c1 and the gas pressure in the low-pressure region within the scroll compressor (in Figure 14 , it is the leftward direction) until its second position. Due to different operating conditions resulting in different pressures in the low-pressure region within the compressor, the second position of the movable seal 76c1 may not be the position where the movable seal 76c presses against the plug 74c and the second opening 72c is completely opened as shown in the second embodiment of the present invention, but rather the position shown in Figure 14 , which is at a certain distance from the plug and causes the second opening 72c1 to be partially opened. That is to say, in the example shown in Figure 14 , when the movable seal 76c1 stays at this second position, the right part of the second opening 72c1 (the part closer to the first opening 71c1 in the longitudinal axis direction of the channel LP) is covered by the movable seal 76c1 and the left part is opened (the proportion of the opened area in the total area of the second opening 71c1 can be designed as needed). At this time, the first opening 71c1 and the second opening 72c1 are not in fluid communication, while the second opening 72c1 and the third opening 73c1 are in fluid communication to open the bypass path. However, since the second opening 72c1 is only partially opened (or the movable seal 76c1 covers a part of the second opening 72c1), the flow area of the bypass path is reduced, so different variable displacement requirements can be met. In addition, since the movable seal 76c1 is configured to be generally cylindrical, the flow area of the bypass path can be more accurately controlled by controlling the second position of the movable seal 76c1 to control the bypass flow rate, which is beneficial for the compressor displacement design for different operating conditions.

[0105] Similarly, those skilled in the art can understand that according to the pressure of the provided jet enthalpy increase fluid, the first position of the movable seal may also not be the position where the second opening 72c1 is completely opened, but rather the position where the movable seal covers the left part of the second opening 72c1 and only allows the right part of the second opening 72c1 to be opened. In this case, when the jet enthalpy increase system is turned on, the second opening 72c1 and the third opening 73c1 are not in fluid communication, while the first opening 71c1 and the second opening 72c1 are in fluid communication to open the jet enthalpy increase path. However, since the second opening 72c1 is only partially opened (or the movable seal 76c1 covers a part of the second opening 72c1), the flow area of the jet enthalpy increase path is reduced, so different jet enthalpy increase requirements can be met.

[0106] For another example, Figure 15 FIG. 3 shows a first modification of the third embodiment of the present invention. In this modification, the movable seal 76d1 is configured to be substantially cylindrical. In this modification, the jet enthalpy boosting joint device 70d1 has substantially the same structure, connection relationship, and control logic as the jet enthalpy boosting joint device 70d in the third embodiment, which will not be described in detail herein. The jet enthalpy boosting joint device 70d1 includes a housing 701d1, and the housing 701d1 includes a main body portion 7010d1 formed with a substantially horizontal passage LP. The jet enthalpy boosting joint device 70d1 further includes a joint portion 702d1 protruding outward from one side wall of the main body portion 7010d1. A movable seal 76d1 and a biasing member 75d1 are installed in the passage LP. The housing 701d1 is formed with a first opening 71d1, a second opening 72d1, and a third opening 73d1 that communicate with the passage LP, wherein the first opening 71d1 and the second opening 72d1 are respectively formed on opposite first and second side walls of the housing 701d1, and the first opening 71d1 communicates with the central receiving through hole of the joint portion 702d1 so as to be able to communicate with the jet enthalpy boosting system, while the third opening 73d1 is located on a fifth side wall connecting the first side wall and the second side wall. A stopper (such as a bolt) 74d1 is also inserted into the third opening 73d1, and the stopper 74d1 further includes a central fluid through hole (through hole) 742d1 that penetrates the stopper 74d1 along the axial direction of the stopper 74d1.

[0107] In particular, the movable seal 76d1 is configured to be substantially cylindrical and has a second position where the bypass path is partially opened (or the flow area of the bypass path is a part of the maximum allowable flow area). As Figure 15 shown, when the solenoid valve of the jet enthalpy boosting system is closed, the movable seal 76d1 moves in the direction of the first opening 71d1 (to the left direction in Figure 15 ) under the biasing force of the biasing member 75d1 and the gas pressure in the low-pressure area in the scroll compressor, overcoming the pressure in the pipeline of the jet enthalpy boosting system, until its second position. Due to different operating conditions, the pressure in the low-pressure area in the compressor is different, and the second position of the movable seal 76d1 may not be the position where the movable seal 76d presses against the sixth side wall opposite to the fifth side wall provided with the third opening 73d1 and the second opening 72d1 is completely opened as shown in the third embodiment of the present invention, but the position shown in Figure 15 where it is spaced a certain distance from the sixth side wall and the second opening 72d1 is partially opened. That is to say, in Figure 15In the example shown, when the movable seal 76d1 stays at the second position, the right part of the second opening 72d1 (the part closer to the first opening 71d1 in the longitudinal axis direction of the channel LP) is covered by the movable seal 76d1 and the left part is open (the ratio of the open area to the total area of the second opening 72d1 can be designed as needed). At this time, the first opening 71d1 is not fluidly connected with the second opening 72d1, and the second opening 72d1 is fluidly connected with the third opening 73d1 to open the bypass path. However, since the second opening 72d1 is only partially open (or the movable seal 76d1 covers a part of the second opening 72d1), the flow area of the bypass path is reduced, so different variable displacement requirements can be met. In addition, since the movable seal 76d1 is constructed in a substantially cylindrical shape, the flow area of the bypass path can be more accurately controlled by controlling the second position of the movable seal 76d1 to control the bypass volume, which is conducive to the compressor displacement design for different working conditions.

[0108] Similarly, those skilled in the art can understand that, according to the pressure of the provided jet enthalpy increasing fluid, the first position of the movable seal may not be a position that makes the second opening 72d1 fully open, but a position where the movable seal covers the left part of the second opening 72d1 and only allows the right part of the second opening 72d1 to be open. In this case, when the jet enthalpy increasing system is turned on, the second opening 72d1 is not fluidly connected to the third opening 73d1, and the first opening 71d1 is fluidly connected to the second opening 72d1 to open the jet enthalpy increasing path, but because the second opening 72d1 is only partially open (or the movable seal 76d1 covers a part of the second opening 72d1), the flow area of the jet enthalpy increasing path is reduced, so different jet enthalpy increasing requirements can be met.

[0109] Figure 18a , Figure 18b and Figure 18c The movable seal 76e according to the fourth modified example of the first embodiment of the present invention is shown, and the movable seal 76e is configured into another shape different from the spherical shape and the cylindrical shape. Specifically, the movable seal 76e includes a central column 761e and a first sealing portion 762e and a second sealing portion 763e respectively located at the upper and lower ends of the central column 761e, so that a gap channel 764e is formed between the first sealing portion 762e and the second sealing portion 763e. The first sealing portion 762e and the second sealing portion 763e protrude radially outward compared to the central column 761e. Preferably, as Figure 18bAs shown, the first sealing portion 762e and the second sealing portion 763e are formed in a substantially cylindrical shape and have the same-sized outer contour shape to facilitate machining and installation. The second sealing portion 763e further includes a through hole 765e that penetrates the second sealing portion 763e along the longitudinal axis direction of the second sealing portion 763e, so that the through hole 765e communicates with the gap channel 764e. The through hole 765e of the second sealing portion 763e may be formed as one or more. Preferably, as Figure 18b shown, the through holes 765e are formed in plurality and arranged radially symmetrically around the central column portion 761e, which is beneficial for the fluid to flow uniformly through the through holes 765e and enables the movable seal 76e to be uniformly stressed and move smoothly. In addition, similar to the second embodiment, in order to enhance the sealing effect, the lower surface of the first sealing portion 762e includes a central horizontal portion and a cutting portion 7621b located at the connection between the lower surface and the outer peripheral surface of the second sealing portion 762e. The cutting portion 7621b is inclined upward compared to the horizontal portion to be adapted to abut and seal against the seat portion 711e provided at the first opening 71e.

[0110] Preferably, the movable seal 76e can be integrally formed by machining a circumferential ring groove (corresponding to the gap channel 764e) and a longitudinal through hole (corresponding to the through hole 765e) communicating with the circumferential ring groove on a substantially cylindrical seal, which makes the machining easier and has a wider application range.

[0111] As Figure 19a 、 Figure 19b and Figure 19c shown, in the fourth modification of the first embodiment according to the present invention, the jet enthalpy increase joint device 70e has substantially the same structure, connection relationship, and control logic as the jet enthalpy increase joint device 70a in the first embodiment, which will not be elaborated here. The jet enthalpy increase joint device 70e includes a housing 701e and a joint portion 702e. The housing 701e includes a main body portion 7011e formed with a substantially vertical channel LP. A movable seal 76e and a biasing member 75e are installed in the channel LP. Advantageously, the diameters of the first sealing portion 762e and the second sealing portion 763e of the movable seal 76e are substantially equal to or slightly smaller than the diameter of the channel LP to facilitate forming a seal between the outer peripheral surfaces of the first sealing portion 762e and the second sealing portion 763e and the inner surface of the main body portion defining the channel LP.

[0112] During the operation of the compressor system, when the solenoid valve of the jet enthalpy increase system is opened, as Figure 19bAs shown, under the action of the pressure of the jet - enhanced enthalpy fluid, the movable seal 76e is lifted up against its own gravity, the biasing force of the biasing member 75e, and the gas pressure in the low - pressure area within the scroll compressor until the movable seal 76e reaches above the end 721e of the second opening 72e formed on the inner surface of the housing - defined passage LP (the first position), thus completely opening the second opening 72e. At this time, the first opening 71e is in communication with the second opening 72e to open the jet - enhanced enthalpy path, and since the second opening 72e is completely open, the flow - through area of the jet - enhanced enthalpy path reaches the maximum allowable flow - through area.

[0113] As Figure 19a shown, when the solenoid valve of the jet - enhanced enthalpy system is closed, the movable seal 76e moves in the direction of the first opening 71e (downward in Figure 19a this case) against the pressure in the pipeline of the jet - enhanced enthalpy system under the action of its own gravity, the biasing force of the biasing member 75e, and the gas pressure in the low - pressure area within the scroll compressor until it reaches a position below the end 721e of the second opening 72e (the second position), thus allowing the second opening 72e to be completely open. At this second position, the second opening 72e is in fluid communication with the third opening 73e to open the bypass path, while preventing the first opening 71e from being in fluid communication with the second opening 72e and the third opening 73e. At this time, since the second opening 72e is completely open, the flow - through area of the bypass path reaches the maximum allowable area. Preferably, this second position may refer to the position where the movable seal 76e contacts the seat portion 711e at the first opening 71e, thus facilitating the maintenance of the stability of the movable seal 76e and strengthening the seal against the first opening 71e.

[0114] Optionally, due to different operating conditions resulting in different pressures in the low - pressure area within the compressor and the selection of biasing members of different specifications, the second position of the movable seal 76e may not be the position where the movable seal 76e presses against the seat portion 711e and completely opens the second opening 72e as Figure 19a shown, but rather the position above the seat portion 711e without contacting the seat portion 711e, that is, the position corresponding to the end 721e of the second opening 72e. At this second position, the second opening 72e may be partially open. See Figure 19c shown. Figure 19c, when the movable seal 76e stays at this second position, the end 721e of the second opening 72e may present that its upper part (the part closer to the third opening 73e in the direction of the longitudinal axis of the channel LP) is covered by the second sealing portion 763e of the movable seal 76e while the lower part is open (the proportion of the open area in the total area of the end of the second opening can be designed as required), and the open part of the second opening 72e (or rather, the end 721e of the second opening 72e) communicates with the clearance channel 764e of the movable seal 76e; or it may present that the lower part of the end 721e of the second opening 72e (the part closer to the first opening 71e in the direction of the longitudinal axis of the channel LP) is covered by the first sealing portion 762e of the movable seal 76e while the upper part is open (the proportion of the open area in the total area of the end of the second opening can be designed as required), and the open part of the second opening 72e (or rather, the end 721e of the second opening 72e) communicates with the clearance channel 764e of the movable seal 76e; or it may present that the upper and lower parts of the end 721e of the second opening 72e are respectively covered by the second sealing portion 763e and the first sealing portion 762e of the movable seal 76e while the middle part is open (in this case, the longitudinal dimension of the clearance channel 764e is smaller than the longitudinal dimension of the end 721e), and the open part of the second opening 72e (or rather, the end 721e of the second opening 72e) communicates with the clearance channel 764e of the movable seal 76e. At this time, the first opening 71e and the second opening 72e are not in fluid communication, while the third opening 73e is in fluid communication with the second opening 72e through the clearance channel 764e and the through hole 765e, thereby opening the bypass path. However, since the second opening 72e is only partially open, it can be understood that the movable seal 76e covers a part of the second opening 72e, thereby reducing the flow area of the bypass path. Therefore, different variable displacement requirements can be met.

[0115] Optionally, when the movable seal 76e is in this second position, in the case where the end 721e is aligned with the clearance channel 764e and the longitudinal dimension of the end 721e is less than or equal to the longitudinal dimension of the clearance channel 764e, the second opening 72e can also be completely open, so as to meet different variable displacement requirements.

[0116] Optionally, in the case where the longitudinal dimension of the first sealing portion 762e and / or the second sealing portion 763e is greater than or equal to the end 721e, the movable seal 76e can also have an intermediate position where the second opening 72e is completely covered so that the first opening 71e, the second opening 72e, and the third opening 73e are not in fluid communication with each other.

[0117] Similarly, those skilled in the art can understand that, according to the pressure of the provided enthalpy-increasing jet fluid, the first position of the movable seal may not be the position where the second opening 72e is completely open, but rather the position where the movable seal covers a part of the second opening 72e (or the end 721e of the second opening 72e) and only allows the other part to be open. In this case, when the enthalpy-increasing jet system is turned on, the second opening 72e is not in fluid communication with the third opening 73e, while the first opening 71e is in fluid communication with the second opening 72e to open the enthalpy-increasing jet path. However, since the second opening 72e is only partially open, it can be understood that the movable seal 76e covers a part of the second opening 72e, thereby reducing the flow area of the enthalpy-increasing jet path. Therefore, different enthalpy-increasing jet requirements can be met.

[0118] Those skilled in the art can understand that through holes can also be provided on the first sealing portion of the movable seal rather than the second sealing portion, so that the first opening can communicate with the second opening through the through holes and the gap channels to achieve the corresponding effect.

[0119] In addition, those skilled in the art can understand that the features of the fourth variant of the first embodiment of the present invention are also equally applicable to the second and third embodiments of the present invention.

[0120] For example, Figure 20a 、 Figure 20b and Figure 20c show a second variant of the second embodiment according to the present invention. In this variant, the enthalpy-increasing jet joint device 70c2 has substantially the same structure, connection relationship, and control logic as the enthalpy-increasing jet joint device 70c1 in the first variant of the second embodiment, which will not be elaborated here. The enthalpy-increasing jet joint device 70c2 includes a housing 701c2, and the housing 701c2 includes a main body portion 7010c2 formed with a substantially horizontal channel LP. The enthalpy-increasing jet joint device 70c2 further includes a joint portion 702c2 protruding outward from a side wall of the main body portion 7010c2. A movable seal 76c2 and a biasing member 75c2 are installed in the channel LP. The housing 701c2 is formed with a first opening 71c2, a second opening 72c2, and a third opening 73c2 that communicate with the channel LP, wherein the first opening 71c2 and the second opening 72c2 are respectively formed on opposite first and second side walls of the housing 701c2. The first opening 71c2 communicates with the central receiving through hole of the joint portion 702c2 so as to be able to communicate with the enthalpy-increasing jet system, while the third opening 73c2 is located on the fifth side wall connecting the first side wall and the second side wall so as to be able to communicate with the low-pressure region in the compressor.

[0121] In particular, the movable seal 76c2 is configured to have a substantially plug-like shape identical to that of the fourth modification of the first embodiment of the present invention, and its specific shape will not be elaborated herein. During the operation of the compressor system, when the solenoid valve of the jet injection enthalpy system is opened, as Figure 20b shown, under the action of the pressure of the jet injection enthalpy fluid, the movable seal 76c2 overcomes the biasing force of the biasing member 75c2 and the gas pressure in the low-pressure region within the scroll compressor and moves in the direction of the third opening 73c2 (shown as the leftward direction in Figure 20b ) until the movable seal 76c2 reaches a position (the first position) to the left of the second opening 72c2, thereby fully opening the second opening 72c2. At this time, the first opening 71c2 communicates with the second opening 72c2 to open the jet injection enthalpy path, and since the second opening 72c2 is fully open, the flow area of the jet injection enthalpy path reaches the maximum allowable flow area.

[0122] When the solenoid valve of the jet injection enthalpy system is closed, as Figure 20a shown, the movable seal 76c2 overcomes the pressure in the pipeline of the jet injection enthalpy system under the action of the biasing force of the biasing member 75c2 and the gas pressure in the low-pressure region within the scroll compressor and moves in the direction of the first opening 71c2 (shown as the rightward direction in Figure 20a ) until it reaches a position (the second position) to the right of the second opening 72c2, thereby allowing the second opening 72c2 to be fully open. At this second position, the second opening 72c2 is in fluid communication with the third opening 73c2 to open the bypass path, while preventing the first opening 71c2 from being in fluid communication with the second opening 72c2 and the third opening 73c2. At this time, since the second opening 72c2 is fully open, the flow area of the bypass path reaches the maximum allowable area. Preferably, this second position may refer to the position where the movable seal 76c2 abuts against the plug arranged opposite to the fifth side wall, thereby facilitating the maintenance of the stability of the movable seal 76c2.

[0123] Optionally, due to different operating conditions resulting in different pressures in the low-pressure region within the compressor, the second position of the movable seal 76c2 may not be the position where the movable seal presses against the plug and fully opens the second opening 72c2 as shown in Figure 20a , but may be a position at a certain distance from the plug, i.e., corresponding to the second opening 72c2, as shown in Figure 20c . At this second position, the second opening path 72c2 may be partially open. See Figure 20c, when the movable seal 76c2 stays at this second position, the second opening 72c2 may present a situation where its left part (the part closer to the third opening 73c2 in the longitudinal axis direction of the channel LP) is covered by the second sealing portion 763c2 of the movable seal 76c2 while the right part is open (the proportion of the open area in the total area of the second opening 72c2 can be designed as needed). The open part of the second opening 72c2 communicates with the clearance channel 764c2 of the movable seal 76c2; or it may present a situation where the right part of the movable seal 76c2 (the part closer to the first opening 71c2 in the longitudinal axis direction of the channel LP) is covered by the first sealing portion 762c2 of the movable seal 76c2 while the left part is open (the proportion of the open area in the total area of the second opening 72c2 can be designed as needed). The open part of the second opening 72c2 communicates with the clearance channel 764c2 of the movable seal 76c2; or it may present a situation where the left and right parts of the movable seal 76c2 are respectively covered by the second sealing portion 763c2 and the first sealing portion 762c2 of the movable seal 76c2 while the middle part is open (in this case, the longitudinal dimension of the clearance channel 764c2 is smaller than the longitudinal dimension of the second opening 72c2, and "longitudinal" refers to the axis direction of the channel LP). The open part of the second opening 72c2 communicates with the clearance channel 764c2 of the movable seal 76c2. At this time, the first opening 71c2 and the second opening 72c2 are not in fluid communication, while the third opening 73c2 is in fluid communication with the second opening 72c2 through the clearance channel 764c2 and the through hole 765c2, thereby opening the bypass path. However, since the second opening 72c2 is only partially open (or rather, the movable seal 76c2 covers a part of the second opening 72c2), the flow area of the bypass path is reduced, so different variable displacement requirements can be met.

[0124] Optionally, when the movable seal 76c2 is in this second position, in the case where the second opening 72c2 is aligned with the clearance channel 764c2 and the longitudinal dimension of the second opening 72c2 is less than or equal to the longitudinal dimension of the clearance channel 764c2, the second opening 72c2 can also be completely open, so as to meet different variable displacement requirements.

[0125] Optionally, in the case where the axial dimension (shown as the dimension along the horizontal direction in Figure 20a , 20b ) of the first sealing portion 762c2 and / or the second sealing portion 763c2 is greater than or equal to the second opening 76c2, the movable seal 76c2 can also have an intermediate position where it completely covers the second opening 72c2, so that the first opening 71c2, the second opening 72c2, and the third opening 73c2 are not in fluid communication with each other.

[0126] Similarly, those skilled in the art can understand that, according to the pressure of the provided jet enthalpy - enhanced fluid, the first position of the movable seal may not be the position where the second opening 72c2 is completely open, but rather a position where the movable seal covers a part of the second opening 72c2 and only allows another part of the second opening 72c2 to be open. In this case, when the jet enthalpy - enhanced system is turned on, the second opening 72c2 is not in fluid communication with the third opening 73c2, while the first opening 71c2 is in fluid communication with the second opening 72c2 to open the jet enthalpy - enhanced path. However, since the second opening 72c2 is only partially open (or the movable seal 76c2 covers a part of the flow area of the second opening 72c2), the flow area of the jet enthalpy - enhanced path is reduced, thus different jet enthalpy - enhanced requirements can be met.

[0127] For another example, Figure 21 Fig. shows a second variant of the third embodiment according to the present invention. In this variant, the jet enthalpy - enhanced joint device 70d2 has substantially the same structure, connection relationship, and control logic as the jet enthalpy - enhanced joint device 70d1 in the first variant of the third embodiment, which will not be elaborated here. The jet enthalpy - enhanced joint device 70d2 includes a housing 701d2, and the housing 701d2 includes a main body portion 7010d2 formed with a substantially horizontal channel LP. The jet enthalpy - enhanced joint device 70d2 further includes a joint portion 702d2 protruding outward from one side wall of the main body portion 7010d2. A movable seal 76d2 and a biasing member 75d2 are installed in the channel LP. The housing 701d2 is formed with a first opening 71d2, a second opening 72d2, and a third opening 73d2 that are in communication with the channel LP, wherein the first opening 71d2 and the second opening 72d2 are respectively formed on opposite first and second side walls of the housing 701d2. The first opening 71d2 is in communication with the central receiving through - hole of the joint portion 702d2 so as to be able to communicate with the jet enthalpy - enhanced system, while the third opening 73d2 is located on the fifth side wall connecting the first side wall and the second side wall. A stop member (such as a bolt) 74d2 is also inserted into the third opening 73d2, and the stop member 74d2 further includes a central fluid through - hole (through - hole) 742d2 penetrating the stop member 74d2 along the axial direction of the stop member 74d2.

[0128] In particular, the movable seal 76d2 is configured to have the same shape as the fourth variant of the first embodiment of the present invention. Similar to Figure 20a and Figure 20b the first position and the second position shown, the movable seal 76d2 can be configured to move between a first position on the right side of the second opening 72d2 that allows the second opening 72d2 to be completely open and a second position on the left side of the second opening 72d2 that allows the second opening 72d2 to be completely open. Details will not be elaborated here.

[0129] Optionally, due to the different pressures in the low-pressure region within the compressor resulting from different operating conditions and the selection of biasing members of different specifications, the second position of the movable seal 76d2 may not be the position where the movable seal 76d2 presses against the stop member 74d2 and the second opening 72d2 is fully opened, but rather a position spaced a certain distance from the stop member 74d2, i.e., corresponding to the second opening 72d2, as shown in Figure 21 In this second position, the second opening 72d2 may be partially opened. When the movable seal 76d2 stays at this second position, the second opening 72d2 may present a situation where its left part (the part closer to the third opening 73d2 in the longitudinal axis direction of the passage LP) is covered by the second sealing portion 763d2 of the movable seal 76d2 and the right part is opened (the proportion of the opened area in the total area of the second opening 72d2 can be designed as needed), and the opened part of the second opening 72d2 communicates with the clearance passage 764d2 of the movable seal 76d2; or the right part of the movable seal 76d2 (the part closer to the first opening 71d2 in the longitudinal axis direction of the passage LP) is covered by the first sealing portion 762d2 of the movable seal 76d2 and the left part is opened (the proportion of the opened area in the total area of the second opening 72d2 can be designed as needed), and the opened part of the second opening 72d2 communicates with the clearance passage 764d2 of the movable seal 76d2; or the left and right parts of the movable seal 76d2 are respectively covered by the second sealing portion 763d2 and the first sealing portion 762d2 of the movable seal 76d2 and the middle part is opened (in this case, the longitudinal dimension of the clearance passage 764d2 is smaller than the longitudinal dimension of the second opening 72d2, and "longitudinal" refers to the axis direction of the passage LP), and the opened part of the second opening 72d2 communicates with the clearance passage 764d2 of the movable seal 76d2. At this time, the first opening 71d2 and the second opening 72d2 are not in fluid communication, while the second opening 72d2 is in fluid communication with the third opening 73d2 through the clearance passage 764d2 and the through hole 765cd2, thus opening the bypass path. However, since the second opening 72d2 is only partially opened (or the movable seal 76d2 covers a part of the second opening 72d2), the flow area of the bypass path is reduced, so different variable displacement requirements can be met.

[0130] Optionally, when the movable seal 76d2 is in this second position, in the case where the second opening 72d2 is aligned with the clearance passage 764d2 and the longitudinal dimension of the second opening 72d2 is less than or equal to the longitudinal dimension of the clearance passage 764d2, the second opening 72d2 may also be fully opened, so as to meet different variable displacement requirements.

[0131] Optionally, in the axial dimension of the first sealing portion 762d2 and / or the second sealing portion 763d2 (in Figure 21When the dimension shown in [horizontal direction] is greater than or equal to the second opening 76d2, the movable seal 76d2 may also have an intermediate position that completely covers the second opening 72d2 so that the first opening 71d2, the second opening 72d2, and the third opening 73d2 are not in fluid communication with each other.

[0132] Similarly, those skilled in the art can understand that, depending on the pressure of the provided jet enthalpy-increasing fluid, the first position of the movable seal may not be a position where the second opening 72d2 is completely open, but rather a position where the movable seal covers a part of the second opening 72d2 and only allows another part of the second opening 72d2 to be open. In this case, when the jet enthalpy-increasing system is turned on, the second opening 72d2 is not in fluid communication with the third opening 73d2, while the first opening 71d2 is in fluid communication with the second opening 72d2 to open the jet enthalpy-increasing path. However, since the second opening 72d2 is only partially open (or rather, the movable seal 76d2 covers a part of the flow area of the second opening 72d2), the flow area of the jet enthalpy-increasing path is reduced, thus different jet enthalpy-increasing requirements can be met.

[0133] Those skilled in the art can understand that the shape of the movable seal is not limited to the shape described herein. For example, the movable seal can also be configured to have a generally cylindrical outer contour and a hollow channel extending in the axial direction. The hollow channel is configured to extend from one end face of the movable seal in the axial direction towards the other end face but does not penetrate the movable seal. That is to say, the hollow channel can communicate with the first opening or the third opening, but cannot communicate the first opening and the third opening. The side wall of the movable seal surrounding the hollow channel has one or more exhaust holes extending transversely to the hollow channel and penetrating the side wall for communicating the hollow channel with the outside of the movable seal. Thus, when the movable seal is in an appropriate position, the second opening can communicate with the first opening or the third opening through the hollow channel and at least one exhaust hole. By designing the dimensions of the hollow channel and / or the exhaust holes, the movable seal of this configuration can further adjust the jet enthalpy-increasing flow rate or the bypass flow rate, thereby enabling adjustment of a wider capacity range of the compressor and meeting more application scenarios. At the same time, for a variable-frequency compressor, different capacity adjustments can be used to adjust different rotational speeds of the compressor. Especially for the scenario where the variable-frequency compressor needs to operate at a very low speed, through capacity adjustment, not only can the minimum capacity of the variable-frequency compressor be further reduced, but also the operating speed of the variable-frequency compressor under small-capacity conditions can be increased, thereby reducing the risk of failures such as wear of the compressor. Similarly, when the compressor needs to operate at a very high speed, not only can the maximum capacity of the compressor be increased through capacity adjustment, but also the operating speed of the compressor can be reduced through capacity adjustment, thereby reducing the risk of high-speed failure of the compressor and improving the performance and reliability of the compressor as well as the performance of the entire refrigeration system.

[0134] Although various embodiments of the present invention have been described in detail herein, it should be understood that the present invention is not limited to the specific embodiments described and illustrated herein, and other variations and modifications can be implemented by those skilled in the art without departing from the essence and scope of the present invention. All such variations and modifications fall within the scope of the present invention. Moreover, all components described herein can be replaced by other technically equivalent components.

Claims

1. A scroll compressor (100) with an economizer system, comprising: A scroll mechanism (CM), the scroll mechanism including a first scroll (20) and a second scroll (30), the first scroll and the second scroll meshing with each other to form a series of compression chambers therebetween; And An economizer connection device (70a, 70b, 70c, 70c1, 70c2, 70d, 70d1, 70d2), the economizer connection device being fixed to the scroll mechanism, Characterized in that the economizer connection device includes a housing (701a, 701b, 701c, 701c1, 701c2, 701d, 701d1, 701d2), a passage (LP) is formed in the housing, the housing is formed with a first opening (71a, 71b, 71c, 71c1, 71c2, 71d, 71d1, 71d2), a second opening (72a, 72b, 72c, 72c1, 72c2, 72d1, 72d2) and a third opening (73a, 73b, 73c, 73c1, 73c2, 73d, 73d1, 73d2) communicating with the passage, the first opening can be in fluid communication with the economizer system, the second opening can be in fluid communication with at least one of the compression chambers (C), and the third opening can be in fluid communication with a low-pressure region (CL) within the scroll compressor, Wherein, a movable seal (76a, 76b, 76b1, 76b2, 76c, 76c1, 76c2, 76d, 76d1, 76d2) is provided in the passage, the movable seal is configured to move between a first position and a second position, in the first position, the movable seal allows the first opening to be in fluid communication with the second opening and prevents the third opening from being in fluid communication with the first opening and the second opening; in the second position, the movable seal allows the second opening to be in fluid communication with the third opening and prevents the first opening from being in fluid communication with the second opening and the third opening.

2. The scroll compressor (100) with an economizer system according to claim 1, comprising a valve configured to switch between a first state and a second state, in the first state, the first opening is supplied with the economizer fluid; in the second state, the first opening is not supplied with the economizer fluid.

3. The scroll compressor (100) with an ejector-enhanced enthalpy system according to claim 2, wherein, A biasing member (75a, 75b, 75c, 75c1, 75c2, 75d, 75d1, 75d2) is provided in the passage, the biasing member biases the movable seal toward the second position.

4. The scroll compressor (100) with an ejector enhanced enthalpy system according to claim 3, wherein, The biasing member is configured as a spring, and the stiffness of the spring is selected such that: In the case where the valve switches from the first state to the second state, the movable seal moves from the first position to the second position; or When the valve is switched from the first state to the second state, the movable seal moves from the first position to an intermediate position between the first position and the second position.

5. The scroll compressor (100) with an ejector enhanced enthalpy system according to claim 4, wherein, In the second position, the movable seal causes the second opening to be fully open or the movable seal covers a part of the second opening.

6. The scroll compressor (100) with an ejector-enhanced enthalpy system according to claim 4, wherein, In the first position, the movable seal causes the second opening to be fully open or the movable seal covers a part of the second opening.

7. The scroll compressor (100) with an enhanced vapor injection system according to claim 4, wherein, In the intermediate position, the first opening, the second opening and the third opening are not in fluid communication with each other.

8. The scroll compressor (100) with an enhanced vapor injection system according to any one of claims 1 to 7, wherein, The movable seal is configured to be substantially spherical or substantially cylindrical.

9. The scroll compressor (100) with an ejector enhanced enthalpy system according to any one of claims 1 to 7, wherein, The movable seal is configured to be substantially cylindrical. The movable seal has a hollow channel extending in the axial direction thereof and at least one exhaust hole transverse to the hollow channel. The hollow channel communicates with the first opening or the third opening. Wherein, the at least one exhaust hole can communicate the hollow channel with the second opening.

10. The scroll compressor (100) with an ejector-enhanced enthalpy system according to any one of claims 1 to 7, wherein, The movable seal includes a central column portion and a first seal portion and a second seal portion located at both ends of the central column portion. A gap channel is formed between the first seal portion and the second seal portion. The first seal portion or the second seal portion includes a through hole communicating with the gap channel. Wherein, the first opening or the third opening can communicate with the second opening through the through hole and the gap channel.

11. The scroll compressor (100) with an ejector-enhanced enthalpy system according to claim 10, wherein, The first seal portion and / or the second seal portion can cover at least a part of the second opening.

12. The scroll compressor (100) with an ejector-enhanced enthalpy system according to any one of claims 1 to 7, wherein, The movable seal is configured to be substantially cylindrical. An annular sealing ring (763b1) is mounted on the outer peripheral surface of the movable seal (76b1), or the outer peripheral surface of the movable seal (76b2) is formed as a labyrinth sealing surface.

13. The scroll compressor (100) with an ejector enhanced enthalpy system according to any one of claims 1 to 7, wherein, A seal is formed between the movable seal and the inner surface of the housing defining the channel.

14. The scroll compressor with an economizer system according to any one of claims 3 to 7, wherein A stop member (74a, 74d, 74d1, 74d2) for preventing the movable seal from escaping from the third opening is provided at the third opening.

15. The scroll compressor with an ejector-enhanced enthalpy system according to claim 14, wherein, The stop member is formed with a through hole (742a, 742d, 742d1, 742d2), and the through hole communicates with the low-pressure region via the third opening.

16. The scroll compressor with an ejector-enhanced enthalpy system according to claim 14, wherein, The stop member includes a rod portion (745a, 745d) inserted into the third opening. The biasing member is arranged around the rod portion. One end of the biasing member abuts against the stop member, and the other end of the biasing member abuts against the movable seal.

17. The scroll compressor with an ejector enhanced vapor injection system according to claim 14, wherein, The stop member is a bolt. The bolt includes a head (743a, 743d) and a rod portion (745a, 745d). The rod portion is inserted into the channel. The biasing member (75a, 75d) is arranged around the rod portion. One end of the biasing member abuts against the head, and the other end of the biasing member abuts against the movable seal (76a, 76d). Wherein: the head is mounted against the end face of the housing forming the third opening, and the bolt is formed with a central fluid through hole penetrating the head and the rod portion along the axial direction of the bolt; alternatively, the head is mounted with a gap from the end face of the housing forming the third opening to allow fluid to pass through.

18. The scroll compressor (100) with an ejector enhanced enthalpy system according to any one of claims 1 to 7, wherein, The first scroll includes a first scroll end plate (21), and at least one communication channel (23) extending from the outer peripheral surface of the first scroll end plate to the at least one compression chamber is formed in the first scroll end plate. The jet injection enthalpy increase joint device is mounted such that the second opening is aligned with the port of the at least one communication channel on the outer peripheral surface of the first scroll end plate, so that the second opening and the at least one compression chamber are in fluid communication through the communication channel.

19. The scroll compressor (100) with an ejector-enhanced enthalpy system according to any one of claims 1 to 7, wherein, The jet injection enthalpy increase joint device includes a joint head (702a, 702c, 702d), the joint head is configured to have a generally cylindrical shape with a central accommodation through hole (703a), one end of the joint head is connected to the first opening, and the input fitting (15c) of the jet injection enthalpy increase system or a connection member (17) for connecting to the input fitting (15) of the jet injection enthalpy increase system is at least partially received in the central accommodation through hole from the other end of the joint head.

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