Screw compressor and air conditioner

Abstract

The utility model discloses a screw compressor and an air conditioner, relates to the field of compressors, and aims to improve the reliability of the screw compressor. The screw compressor comprises a compressor body, an oil separation barrel and a backpressure assembly. The compressor body comprises a suction end and an exhaust end; a first communicating flow channel is formed in the wall body of the compressor body, and one end of the first communicating flow channel communicates with the air suction end. The oil separation barrel is mounted at the exhaust end of the compressor body; the oil separation barrel is provided with a first exhaust port; a second communication flow channel is arranged in the wall body of the oil separation barrel; the second communicating flow channel is located at the downstream of the first communicating flow channel and communicates with the first communicating flow channel; the back pressure assembly is installed at the first exhaust port and comprises a movable sliding block. The backpressure assembly controls opening and closing of the first exhaust port by moving the sliding block. According to the technical scheme, the flowing length of gas at the air suction end outside the screw compressor is shortened, resonance and noise of an air conditioner can be greatly reduced, and the reliability of the air conditioner is improved.

Description

Technical Field

[0001] The utility model relates to the field of compressors, in particular to a screw compressor and an air conditioner. Background Art

[0002] Screw compressors typically use the reciprocating motion of a slide valve and an oil piston to adjust capacity or pressure ratio. Capacity and pressure ratio regulation are two common screw compressor adjustment methods. In capacity regulation, the length of the mating section between the slide valve and the rotor is variable, while in pressure ratio regulation, the length of the mating section between the slide valve and the rotor remains constant and always operates at full load. The reciprocating motion of the slide valve and the oil piston is crucial to the compressor's operating conditions, specifically the pressure differential between the compressor's intake and exhaust air. If the pressure differential is too small to overcome the resistance to reciprocating motion, loading and unloading will be impossible.

[0003] In related technologies, central air conditioners often encounter cold start situations due to climatic conditions and other reasons. During cold start, since the condensing temperature of the system is too low, the exhaust pressure on the high-pressure end of the system cannot be increased after the compressor is started, and the high and low pressure sides of the compressor cannot establish sufficient high and low pressure differences, which will cause the compressor to be unable to load and the compressor to be insufficiently supplied with oil. The compressor may be seriously damaged due to insufficient lubrication and cooling.

[0004] To address this issue, some air conditioners are equipped with a pressure-maintaining valve. This valve maintains pressure. When the pressure reaches the valve's opening pressure, the valve opens, allowing the screw compressor to discharge air. The valve's opening depends on the difference between the holding pressure and the suction pressure, so it's necessary to connect the valve to the screw compressor's suction port. After the screw compressor is turned on, the valve quickly establishes a sufficient high-low pressure differential, ensuring smooth loading and unloading of the compressor and preventing any adverse effects from oil depletion.

[0005] The inventors have discovered that there are at least the following problems in the prior art: in existing air conditioners, the balancing pipe connecting the pressure maintaining valve and the suction side of the screw compressor is too long. The overly long balancing pipe is prone to cause resonance in the air conditioner, and the noise will also increase, affecting the reliability of the air conditioner. Utility Model Content

[0006] The utility model provides a screw compressor and an air conditioner, which are used to improve the reliability of the screw compressor.

[0007] The present invention provides a screw compressor, comprising:

[0008] The compressor body includes an air intake end and an air discharge end; a first communication channel is provided inside the wall of the compressor body, and one end of the first communication channel is connected to the air intake end;

[0009] An oil separator barrel is mounted on the exhaust end of the compressor body; the oil separator barrel is provided with a first exhaust port; a second communication flow channel is provided inside the wall of the oil separator barrel; the second communication flow channel is located downstream of the first communication flow channel and is connected to the other end of the first communication flow channel;

[0010] a back pressure assembly installed at the first exhaust port, the back pressure assembly comprising a slider movably disposed at the first exhaust port; the back pressure assembly controls the opening and closing of the first exhaust port by moving the slider;

[0011] The second communicating flow channel is configured to provide a first pressure to the back pressure assembly, and the gas inside the oil separator barrel provides a second pressure to the back pressure assembly.

[0012] In some embodiments, the oil separator comprises:

[0013] a cylinder, fixedly connected to the exhaust end of the compressor body;

[0014] The mounting seat is located outside the barrel, and the two are integrated or fixedly connected; the mounting seat includes a mounting cavity and the first exhaust port; one end of the mounting cavity is connected to the interior of the barrel, and the other end of the mounting cavity is open; the first exhaust port passes through the wall of the mounting seat and is connected to the first exhaust port; the slider is installed inside the mounting cavity; and

[0015] The end cover is detachably mounted on the opening of the mounting cavity.

[0016] In some embodiments, the back pressure assembly further comprises:

[0017] an elastic member, installed between the slider and the inner wall of the mounting seat; and

[0018] A limiting member is installed on the inner wall of the mounting seat and is located at the end of the slider away from the elastic member, and the limiting member is constructed to limit the position of the slider; wherein, when the slider is in a first extreme position, the slider blocks the first exhaust port and the slider is supported by the limiting member; when the slider is in a second extreme position, the slider is away from the first exhaust port and separated from the limiting member.

[0019] In some embodiments, the mounting base is further provided with a second exhaust port; the screw compressor further comprises:

[0020] A switching valve is installed at the second exhaust port to control the opening and closing of the second exhaust port.

[0021] In some embodiments, a central axis of the first exhaust port is parallel to a central axis of the second exhaust port.

[0022] In some embodiments, the second exhaust port is located on a side of the first exhaust port close to the central axis of the screw compressor.

[0023] In some embodiments, when the screw compressor is in a first operating state, the first exhaust port is configured to be openable, and the second exhaust port is configured to be closed;

[0024] When the screw compressor is in the second operating state, the second exhaust port is configured to be openable, and the first exhaust port is configured to be closed.

[0025] In some embodiments, under the first operating condition, the pressure difference between the second pressure and the first pressure of the screw compressor is less than or equal to a; and / or,

[0026] Under the second working condition, the pressure difference between the second pressure and the first pressure of the screw compressor is greater than a; wherein a is 0.2 MPa to 0.3 MPa.

[0027] In some embodiments, the screw compressor further comprises:

[0028] A connecting pipe is located outside the compressor body and the oil separator; the connecting pipe includes an air inlet and an air outlet; the connecting pipe is located downstream of the second connecting flow channel and the air inlet of the connecting pipe is connected to the second connecting flow channel, and the air outlet of the connecting pipe is connected to the mounting cavity to provide a first pressure to the back pressure assembly.

[0029] In some embodiments, the second communication channel is directly connected to the installation cavity.

[0030] In some embodiments, the first communication passage is in communication with a downstream end of a suction end of the compressor body.

[0031] In some embodiments, at least portions of the first communicating flow passage and the second communicating flow passage are parallel to the axial direction of the screw compressor.

[0032] In some embodiments, the back pressure assembly is located on the top of the oil separator barrel.

[0033] An embodiment of the present invention further provides an air conditioner, comprising a screw compressor provided by any technical solution of the present invention.

[0034] The screw compressor provided by the above technical solution introduces the gas at the suction end of the screw compressor into the back pressure component by guiding the gas at the suction end through a first connecting flow channel inside the wall of the compressor body and a second connecting flow channel provided inside the wall of the oil separator barrel to the vicinity of the back pressure component. At this time, the gas at the suction end is already very close to the back pressure component, so the length of the gas at the suction end flowing outside the screw compressor can be greatly shortened, thereby greatly reducing the resonance and noise of the air conditioner and improving the reliability of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0036] Figure 1 This is a schematic diagram of a screw compressor in a closed state provided in some embodiments of the present invention.

[0037] Figure 2 This is a schematic diagram of the first exhaust port of the screw compressor in an open state provided in some embodiments of the present invention.

[0038] Figure 3 Schematic diagram of a screw compressor in a closed state provided in other embodiments of the present invention.

[0039] Figure 4 Schematic diagram of the first exhaust port of the screw compressor in an open state provided in other embodiments of the present invention.

[0040] Reference numerals:

[0041] 1. Compressor body; 2. Oil separator; 3. Back pressure assembly; 4. Connecting pipes;

[0042] 11. Intake end; 12. Exhaust end; 13. First communication channel;

[0043] 21. Second communicating flow channel; 22. First exhaust port; 23. Cylinder; 24. Mounting seat; 25. End cover; 26. Second exhaust port;

[0044] 31. Slider; 32. Elastic member; 33. Limiting member;

[0045] 41. Air inlet; 42. Air outlet. DETAILED DESCRIPTION

[0046] The following combination Figures 1 to 4The technical solution provided by the present invention is described in more detail. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions and numerical values ​​described in these embodiments should be interpreted as merely exemplary and not as limiting.

[0047] The terms "first," "second," and similar terms used in this disclosure do not denote any order, quantity, or importance, but are simply used to distinguish one part from another. Terms such as "include" or "comprise" mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements.

[0048] In the present disclosure, when a specific device is described as being located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be not directly connected to the other device but with an intervening device.

[0049] All terms used in this disclosure, including technical or scientific terms, have the same meaning as understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined herein.

[0050] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment are considered part of the specification.

[0051] The dimensions of the various parts shown in the drawings are not drawn in accordance with actual proportions. In the drawings, common structural elements or structural elements of the same type are given the same reference numerals, and their repeated descriptions are appropriately omitted.

[0052] Figure 1 This is a schematic diagram of the first exhaust port 22 of the screw compressor provided in some embodiments of the present invention in a closed state. Figure 2 This is a schematic diagram of the first exhaust port 22 of the screw compressor provided in some embodiments of the present invention in an open state.

[0053] See also Figure 1 and Figure 2 The embodiment of the present invention provides a screw compressor, comprising a compressor body 1, an oil separator barrel 2, and a back pressure assembly 3. The compressor body 1 comprises an intake end 11 and an exhaust end 12; a first connecting flow channel 13 is provided inside the wall of the compressor body 1, and one end of the first connecting flow channel 13 is connected to the intake end 11. The oil separator barrel 2 is mounted on the exhaust end 12 of the compressor body 1; the oil separator barrel 2 is provided with a first exhaust port 22; a second connecting flow channel 21 is provided inside the wall of the oil separator barrel 2; the second connecting flow channel 21 is located downstream of the first connecting flow channel 13 and is connected to the other end of the first connecting flow channel 13. Figure 1 The blue solid line with an arrow in the middle illustrates the flow direction of air within the first connecting flow channel 13 and the second connecting flow channel 21. The backpressure assembly 3 is mounted at the first exhaust port 22 and includes a slider 31 movably mounted thereto. The backpressure assembly 3 controls the opening and closing of the first exhaust port 22 by moving the slider 31. The second connecting flow channel 21 is configured to provide a first pressure Ps to the backpressure assembly 3, while the gas within the oil separator tank 2 provides a second pressure Pm to the backpressure assembly 3.

[0054] The compressor body 1 is made of high-strength metal and provides a stable support and mounting base for the compressor's various components. Inside, meshing male and female rotors are mounted. The compressor body 1 is equipped with an intake port 11 for drawing in external air. The air is compressed by the male and female rotors, producing compressed gas. The compressed gas is filtered in the oil separator 2 before exiting the screw compressor.

[0055] The suction end 11 of the compressor is an area from which external gas is introduced into the gap between the female and male rotors and compressed.

[0056] The wall of the compressor has a certain thickness, and the first connecting flow channel 13 is located inside the wall of the compressor, similar to being located inside a "wall". The first connecting flow channel 13 provided in the wall of the compressor can be a straight flow channel, a curved flow channel, or a broken line flow channel. The shape of the first connecting flow channel 13 is preferably such that it guides the gas from the intake end 11 of the compressor body 1 to the back pressure assembly 3 over the shortest possible distance. The first connecting flow channel 13 is connected to the intake end 11 of the compressor body 1, specifically to the downstream end of the intake end 11 of the compressor body 1. This can shorten the length of the first connecting flow channel 13, reduce the difficulty of processing, and reduce the length of the gas flow path.

[0057] The function of the first communication channel 13 is to allow the suction end 11 of the compressor body 1 to apply a first pressure Ps, also known as the suction pressure, to the backpressure assembly 3. The gas within the oil separator tank 2 applies a second pressure Pm, also known as the discharge pressure, to the backpressure assembly 3. This allows the backpressure assembly 3 to implement a corresponding control strategy based on the pressure difference between the first pressure Ps and the second pressure Pm.

[0058] The oil separator barrel 2 is airtightly connected to the compressor body 1 to prevent air leakage. The barrel 2 is cylindrical in shape and has a high-strength metal wall. A filter is installed inside the barrel 2, separating the compressed oil-gas mixture into gas and oil. The oil remains at the bottom of the barrel 2, while the compressed gas is discharged through the barrel 2. The oil separated in the barrel 2 provides stable lubrication for the compressor body 1. When the compressor body 1 requires lubricating oil, the oil in the barrel 2 can be promptly returned to the body through the oil return pipe to ensure the normal operation of the compressor.

[0059] The back pressure assembly 3 is installed inside the oil separator barrel 2. One end of the back pressure assembly 3 is subjected to the first pressure Ps, and the other end is subjected to the second pressure. It is controlled according to the pressure difference between the first pressure Ps and the second pressure Pm of the screw compressor. When the pressure difference between the first pressure Ps and the second pressure Pm of the screw compressor is sufficient to drive the slider 31 of the back pressure assembly 3 to move, the slider 31 avoids the first exhaust port 22, the first exhaust port 22 opens, and the gas in the oil separator barrel 2 is discharged to the outside of the screw compressor through the first exhaust port 22. When the pressure difference between the first pressure Ps and the second pressure Pm of the screw compressor is small and insufficient to open the back pressure assembly 3, the first exhaust port 22 is closed, and the gas in the oil separator barrel 2 cannot be discharged to the outside of the screw compressor through the first exhaust port 22. The back pressure assembly 3 can achieve air holding to adjust the pressure difference between the first pressure Ps and the second pressure Pm of the screw compressor.

[0060] In some embodiments, the back pressure assembly 3 is located at the top of the oil separator barrel 2 to cooperate with the first exhaust port 22 to realize the top exhaust of the screw compressor.

[0061] In the above technical solution, when the gas at the suction end 11 of the screw compressor is introduced into the back pressure component 3, the method adopted is to guide the gas at the suction end 11 to the vicinity of the back pressure component 3 through the first connecting flow channel 13 inside the wall of the compressor body 1 and the second connecting flow channel 21 provided inside the wall of the oil separator barrel 2. At this time, the gas at the suction end 11 is very close to the back pressure component 3. Regardless of whether the connecting pipeline 4 introduced later is set up, or the second connecting flow channel 21 introduced later is directly used to provide suction pressure to the back pressure component 3, which is also referred to as the first pressure Ps in this article, it can greatly shorten the length of the gas at the suction end 11 flowing outside the screw compressor, and also greatly reduce the resonance and noise of the air conditioner, thereby improving the reliability of the air conditioner.

[0062] Continue to see Figure 1 and Figure 2 In some embodiments, the oil separator barrel 2 includes a barrel 23, a mounting base 24, and an end cap 25. The barrel 23 is fixedly connected to the exhaust port 12 of the compressor body 1. The mounting base 24 is located outside the barrel 23 and is integral with or fixedly connected to the barrel 23. The mounting base 24 protrudes from the barrel 23. In some embodiments, the mounting base 24 is mounted on the top of the barrel 23. The screw compressor has a top exhaust structure.

[0063] Mounting base 24 is, for example, cylindrical. Mounting base 24 is located outside of cylinder 23, and the mounting base 24 and cylinder 23 are integral or fixedly connected. Mounting base 24 includes a mounting cavity 20 and a first exhaust port 22. One end of mounting cavity 20 communicates with the interior of cylinder 23, while the other end of mounting cavity 20 is open. First exhaust port 22 extends through the wall of mounting base 24 and communicates with first exhaust port 22. Back pressure assembly 3 is mounted within mounting cavity 20.

[0064] The mounting cavity 20 of the mounting base 24 is open to facilitate installation of the backpressure assembly 3. The end cap 25 seals the open mounting cavity 20, making assembly and disassembly of the backpressure assembly 3 more convenient. Once the end cap 25 is in place, the mounting cavity 20 and the interior of the barrel 23 form a sealed chamber, and the gas in the oil separator barrel 2 can only be discharged to the outside of the screw compressor through the first exhaust port 22 or the second exhaust port 26 described later.

[0065] Continue to see Figure 1 and Figure 2 In some embodiments, the back pressure assembly 3 includes a slider 31, an elastic member 32, and a limit member 33. The slider 31 is movably mounted in the mounting cavity 20. The elastic member 32 is mounted between the slider 31 and the inner wall of the mounting seat 24. The elastic member 32 is, for example, a spring, which is in a compressed state. The limit member 33 is mounted on the inner wall of the mounting seat 24 and is located at the end of the slider 31 away from the elastic member 32. The limit member 33 is constructed to limit the position of the slider 31; the limit member 33 is specifically, for example, a boss. There can be one or more limit members 33. If there is one limit member 33, the limit member 33 can adopt an annular structure or a C-shaped structure to increase the contact area between the limit member 33 and the slider 31, so that the slider 31 is firmly supported. If there are multiple limit members 33, the multiple limit members 33 are evenly distributed along the circumference of the mounting cavity 20 to increase the force points of the slider 31 and the balance of the force.

[0066] When the slider 31 is in the first limit position, the slider 31 blocks the first exhaust port 22 and the slider 31 is supported by the limiting member 33. Figure 1The first limit position corresponds to the pressure difference between the second pressure Pm and the first pressure Ps being insufficient to overcome the elastic force of the elastic member 32 , and the slider 31 is pressed against the limit member 33 under the action of the elastic member 32 .

[0067] When the slider 31 is in the second limit position, Figure 1 In the upper limit position shown, the slider 31 is away from the first exhaust port 22 and is separated from the stopper 33. The second limit position corresponds to a pressure difference between the second pressure Pm and the first pressure Ps sufficient to overcome the elastic force of the elastic member 32, and the slider 31 is pushed upward.

[0068] The back pressure assembly 3 provided by the above structural solution has a compact structure, contains a small number of components, and can effectively control whether the back pressure assembly 3 opens the first exhaust port 22 according to the first pressure Ps and the second pressure Pm of the screw compressor.

[0069] Continue to see Figure 1 and Figure 2 In some embodiments, the mounting base 24 is further provided with a second exhaust port 26. The screw compressor further includes a switching valve (not shown) mounted at the second exhaust port 26 to control the opening and closing of the second exhaust port 26. When the switching valve is open, the gas in the oil separator barrel 2 can be discharged to the outside of the screw compressor through the second exhaust port 26 without resistance.

[0070] The opening and closing states of the second exhaust port 26 are not controlled by the back pressure assembly 3 but are directly controlled by the switching valve, which can determine whether to open the second exhaust port 26 according to the working conditions. It should be noted that when the second exhaust port 26 is open, the first exhaust port 22 cannot be opened due to the back pressure assembly 3.

[0071] The above technical solution uses two exhaust ports to achieve exhaust, and the control strategies of the two exhaust ports are different. The first exhaust port 22 is used for exhaust under low pressure difference conditions, and the second exhaust port 26 is used for exhaust under other conditions, so that the overall energy efficiency of the screw compressor under various working conditions is improved.

[0072] In some embodiments, when the screw compressor is in the first operating state, the first exhaust port 22 is configured to be openable and the second exhaust port 26 is configured to be closed. The first operating state is, for example, a low pressure difference operating state, and the applicable range of the low pressure difference operating state can be determined based on practice.

[0073] When the compressor pressure differential Pm-Ps is low, the system issues a command to close second exhaust port 26 and open first exhaust port 22. At this point, second pressure Pm is too low to dislodge slider 31. However, over time, second pressure Pm continues to rise within oil separator barrel 2 until the compressor pressure differential Pm-Ps spring and the weight of slider 31 are negligible, allowing the slide valve and oil piston to move flexibly. Only then can slider 31 be dislodged for exhaust. This low-pressure differential exhaust resolves the issue of inoperative or difficult compressor capacity or pressure regulation, enabling smooth capacity or pressure regulation even under low-pressure differential conditions.

[0074] For refrigerants like R22 or R134a, the fully open pressure of elastic member 32 is between 0.7 MPa and 0.75 MPa. For other refrigerants, the pressure should be adjusted based on specific circumstances. Using a back-pressure mechanism to exhaust air from first exhaust port 22 results in a certain amount of exhaust loss due to the need to overcome the spring force and the compressor overcompression caused by the increase in second pressure Pm. This reduces compressor efficiency. Therefore, when the compressor pressure differential Pm-Ps is large, exhaust can be directly conducted from second exhaust port 26, improving compressor efficiency.

[0075] In some embodiments, under the first operating condition, the pressure difference between the second pressure Pm and the first pressure Ps of the screw compressor is less than or equal to a. Here, a is 0.2 MPa to 0.3 MPa; specifically, a is 0.2 MPa, 0.25 MPa, 0.28 MPa, or 0.3 MPa. The pressure of the elastic member 32 can be set to 0.5 MPa to 0.7 MPa.

[0076] When the screw compressor is in the second operating state, the second exhaust port 26 is configured to be openable, and the first exhaust port 22 is configured to be closed. The second operating state is specifically an operating state other than the first operating state.

[0077] In some embodiments, under the second operating condition, the pressure difference between the second pressure Pm and the first pressure Ps of the screw compressor is greater than a. When the compressor pressure difference Pm-Ps is sufficiently large, the system issues a command to close the first exhaust port 22 and open the second exhaust port 26. Refrigerant is discharged through the second exhaust port 26. This process does not generate exhaust losses, and the compressor's energy efficiency is not affected. Here, Pm is the second pressure Pm, and Ps is the first pressure Ps.

[0078] The first exhaust port 22 and the second exhaust port 26 are opened under different working conditions, and exhaust is not discharged at the same time.

[0079] In some embodiments, the central axis of the first exhaust port 22 and the central axis of the second exhaust port 26 are parallel. The first and second exhaust ports 22, 26 are located close together and are both mounted on the mounting base 24. The exhaust directions of the first and second exhaust ports 22, 26 are parallel. Regardless of which exhaust port is open, the exhaust direction and position of the screw compressor remain essentially unchanged. Furthermore, the barrel 23 of the oil separator barrel 2 no longer requires additional exhaust ports, simplifying the structure of the barrel 23. The mounting base 24 is small, making it easier to machine the first and second exhaust ports 22, 26.

[0080] Continue to see Figure 1 and Figure 2 In some embodiments, the second exhaust port 26 is located on a side of the first exhaust port 22 close to the central axis of the screw compressor. This method makes it easier to arrange and install the back pressure assembly 3.

[0081] Continue to see Figure 1 and Figure 2 In some embodiments, the screw compressor further includes a connecting pipe 4, which is located outside the compressor body 1 and the oil separator barrel 2. The connecting pipe 4 includes an air inlet 41 and an air outlet 42; the connecting pipe 4 is located downstream of the second connecting flow channel 21 and the air inlet 41 of the connecting pipe 4 is connected to the second connecting flow channel 21, and the connection can be achieved by a quick-connect joint. The air outlet 42 of the connecting pipe 4 is connected to the mounting cavity 20, and the connection can be achieved by another quick-connect joint to provide a first pressure Ps to the back pressure assembly 3. Since the back pressure assembly 3 is located inside the oil separator barrel 2, the gas inside the oil separator barrel 2 provides a second pressure Pm to the back pressure assembly 3. When the pressure difference between the first pressure Ps and the second pressure Pm is large enough, the pressure difference is sufficient to overcome the elastic force of the elastic member 32, and the slider 31 of the back pressure assembly 3 is moved. Otherwise, the slider 31 of the back pressure assembly 3 remains in place, that is, the position supported by the limit member 33.

[0082] In some embodiments, at least partial regions of the first communication flow channel 13 and the second communication flow channel 21 are parallel to the axial direction of the screw compressor.

[0083] Screw compressors adjust capacity or pressure ratio through the reciprocating motion of a slide valve and oil piston. When the screw compressor is in the first operating mode (low differential pressure), a small pressure difference (Pm-Ps) can cause the slide valve and oil piston to not operate or to operate too slowly. To address this, backpressure assembly 3 is used to increase the compressor's secondary pressure (Pm) until the Pm-Ps pressure difference reaches the design value (ΔP) that allows the slide valve and oil piston to flexibly operate before exhaust can occur.

[0084] In the screw compressor provided by the above technical solution, the first pressure Ps is mainly introduced into the installation cavity 20 through the first connecting flow channel 13 and the second connecting flow channel 21. Compared with the solution of directly using a pipeline to introduce the suction end 11 of the screw compressor to the exhaust end 12, the length of the connecting pipeline 4 required by the technical solution of the embodiment of the utility model is very short, which reduces the noise and vibration fine-tuning caused by external pipelines and reduces the cost of the compressor.

[0085] Figure 3 Schematic diagram of the first exhaust port 22 of the screw compressor in a closed state provided in other embodiments of the present invention. Figure 4 Schematic diagram of the first exhaust port 22 of the screw compressor in an open state provided in other embodiments of the present invention.

[0086] See also Figure 3 and Figure 4 In other embodiments, the second communication channel 21 is directly connected to the installation cavity 20. The second communication channel 21 includes multiple sections and is directly connected to the installation cavity 20. This implementation does not require the installation of pipelines outside the compressor body 1 or the oil separator 2, and can introduce the first pressure Ps into the installation cavity 20.

[0087] An embodiment of the present invention further provides an air conditioner, comprising a screw compressor provided by any technical solution of the present invention.

[0088] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are used solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0089] In the description of the present invention, each technical feature can be combined with other technical features where feasible.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A screw compressor, characterized in that: include: A compressor body (1) comprises an air intake end (11) and an air discharge end (12); a first communication channel (13) is provided inside the wall of the compressor body (1), and one end of the first communication channel (13) is communicated with the air intake end (11); An oil separator barrel (2) is mounted on the exhaust end (12) of the compressor body (1); the oil separator barrel (2) is provided with a first exhaust port (22); a second communication flow channel (21) is provided inside the wall of the oil separator barrel (2); the second communication flow channel (21) is located downstream of the first communication flow channel (13) and is in communication with the other end of the first communication flow channel (13); and A back pressure assembly (3) is installed at the first exhaust port (22), the back pressure assembly (3) comprising a slider (31) movably arranged at the first exhaust port (22); the back pressure assembly (3) controls the opening and closing of the first exhaust port (22) by moving the slider (31); The second communicating flow channel (21) is configured to provide a first pressure (Ps) to the back pressure component (3), and the gas inside the oil separator barrel (2) provides a second pressure (Pm) to the back pressure component (3).

2. The screw compressor according to claim 1, characterized in that The oil separator barrel (2) comprises: A cylinder (23) is fixedly connected to the exhaust end (12) of the compressor body (1); The mounting seat (24) is located outside the barrel (23), and the two are integrated or fixedly connected; the mounting seat (24) includes a mounting cavity (20) and the first exhaust port (22); one end of the mounting cavity (20) is connected to the interior of the barrel (23), and the other end of the mounting cavity (20) is open; the first exhaust port (22) passes through the wall of the mounting seat (24) and is connected to the first exhaust port (22); the slider (31) is installed inside the mounting cavity (20); and The end cover (25) is detachably mounted on the opening of the mounting cavity (20).

3. The screw compressor according to claim 2, characterized in that The back pressure assembly (3) further comprises: an elastic member (32) mounted between the slider (31) and the inner wall of the mounting seat (24); and A limiting member (33) is mounted on the inner wall of the mounting seat (24) and is located at an end of the slider (31) away from the elastic member (32); the limiting member (33) is configured to limit the position of the slider (31); wherein, when the slider (31) is in a first limit position, the slider (31) blocks the first exhaust port (22), and the slider (31) is supported by the limiting member (33); when the slider (31) is in a second limit position, the slider (31) is away from the first exhaust port (22), and the slider (31) is separated from the limiting member (33).

4. The screw compressor according to claim 3, characterized in that The mounting seat (24) is further provided with a second exhaust port (26); the screw compressor further comprises: A switching valve is installed at the second exhaust port (26) to control the opening and closing of the second exhaust port (26).

5. The screw compressor according to claim 4, characterized in that The central axis of the first exhaust port (22) and the central axis of the second exhaust port (26) are parallel.

6. The screw compressor according to claim 4, characterized in that The second exhaust port (26) is located on a side of the first exhaust port (22) close to the central axis of the screw compressor.

7. The screw compressor according to claim 4, characterized in that When the screw compressor is in a first operating state, the first exhaust port (22) is configured to be openable, and the second exhaust port (26) is configured to be closed; When the screw compressor is in the second operating state, the second exhaust port (26) is configured to be openable, and the first exhaust port (22) is configured to be closed.

8. The screw compressor according to claim 7, characterized in that Under the first working condition, the pressure difference between the second pressure (Pm) and the first pressure (Ps) of the screw compressor is less than or equal to a; and / or, In the second working condition, the pressure difference between the second pressure (Pm) and the first pressure (Ps) of the screw compressor is greater than a; Among them, a is 0.2MPa~0.3MPa.

9. The screw compressor according to any one of claims 2, 4 to 8, characterized in that: Also includes: A connecting pipe (4) is located outside the compressor body (1) and the oil separator barrel (2); the connecting pipe (4) includes an air inlet (41) and an air outlet (42); the connecting pipe (4) is located downstream of the second connecting flow channel (21), and the air inlet (41) of the connecting pipe (4) is connected to the second connecting flow channel (21), and the air outlet (42) of the connecting pipe (4) is connected to the mounting cavity (20) to provide the first pressure (Ps) to the back pressure assembly (3).

10. The screw compressor according to any one of claims 2, 4 to 8, characterized in that: The second communicating flow channel (21) is directly connected to the mounting cavity (20).

11. The screw compressor according to any one of claims 1, 2, 4 to 8, characterized in that: The first communication flow channel (13) is in communication with the downstream end of the suction end (11) of the compressor body (1).

12. The screw compressor according to any one of claims 1, 2, 4 to 8, characterized in that: At least part of the first communicating flow channel (13) and the second communicating flow channel (21) are parallel to the axial direction of the screw compressor.

13. The screw compressor according to any one of claims 1, 2, 4 to 8, characterized in that: The back pressure assembly (3) is located on the top of the oil separator barrel (2).

14. An air conditioner, characterized in that: include: The screw compressor according to any one of claims 1 to 13.

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