An anti-reverse structure, a screw compressor and its refrigeration equipment

Abstract

This utility model provides an anti-reverse rotation structure, a screw compressor, and refrigeration equipment thereof, relating to the field of compressor technology. The anti-reverse rotation structure is used in a screw compressor. A rotor cavity is formed within the screw compressor housing, with an intake port and an exhaust port. The anti-reverse rotation structure includes a bushing and fan blades. The bushing is fixedly fitted onto the male rotor of the screw compressor. Multiple fan blades are arranged at circumferential intervals along the bushing, and the fan blades are asymmetrically shaped. When the screw compressor reverses, the driving fluid flows from the exhaust port to the intake port. When the screw compressor reverses due to an abnormality, the fan blades drive the fluid to flow in the opposite direction from the exhaust port to the intake port, generating a reverse force to counteract the reverse rotation tendency of the male rotor, causing the compressor to return to the forward rotation state. The rotor compressor operates stably and reliably, with a long service life.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to an anti-reverse structure, a screw compressor and its refrigeration equipment. Background Technology

[0002] Compressors are typically designed to operate in a specific direction to ensure that gas or fluid is properly drawn in, compressed, and discharged.

[0003] Compressor reversal usually refers to a situation where the compressor rotates in the opposite direction to the design requirements during operation. This is usually caused by electrical wiring errors, control system failures, mechanical problems, improper installation, etc. All of these situations may cause the compressor to malfunction, or even damage the equipment, resulting in poor working stability and a short service life.

[0004] In view of this, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content

[0005] To address the issues of equipment being prone to damage and having a short service life, the purpose of this utility model is to provide an anti-reverse structure, a male rotor assembly, and its screw compressor, which offer good operational stability and a long service life.

[0006] To achieve the above objectives, the present invention employs the following technical means:

[0007] The first aspect of this utility model provides an anti-reverse rotation structure for a screw compressor. The screw compressor housing forms a rotor cavity with an intake port and an exhaust port. The anti-reverse rotation structure includes a bushing and fan blades. The bushing is fixedly fitted onto the male rotor of the screw compressor. Multiple fan blades are arranged circumferentially at intervals along the bushing. The fan blades are asymmetrically shaped. When the male rotor of the screw compressor rotates forward, driving fluid flows from the intake port to the exhaust port. When the screw compressor rotates in reverse, driving fluid flows from the exhaust port to the intake port.

[0008] Optionally, the fan blades are hinged to the bushing, wherein each fan blade is capable of switching between an extended state and a retracted state, and each fan blade rotates to extend along the axial direction of the bushing to achieve the extended state; the fan blades rotate to the periphery of the bushing to achieve the retracted state;

[0009] Specifically, when the male rotor rotates forward, the fan blades switch to the contracted state; when the male rotor rotates in reverse, the fan blades switch to the extended state.

[0010] Optionally, it also includes an elastic element, one end of which is connected to the bushing and the other end of which is connected to the fan blade; the elastic element and the fan blade are arranged in a one-to-one correspondence.

[0011] Optionally, the elastic element is a tension spring, which has a tendency to move the fan blade from the extended state to the contracted state.

[0012] Optionally, the fan blades are twisted on the bushing, and the twisting direction of the fan blades is the same as the forward rotation direction of the male rotor.

[0013] Optionally, the fan blade is directly connected to the bushing, or a hinge or shaft connects the fan blade to the bushing.

[0014] Optionally, the windward side of the fan blade faces the air intake, and the leeward side faces the exhaust port. The windward side of the fan blade is convex, and the leeward side of the fan blade is relatively flat or concave.

[0015] Optionally, the fan blade is connected to a power mechanism for adjusting the deflection angle of the fan blade relative to the bushing. The power mechanism is controlled by a reverse rotation monitoring device, which is used to detect the rotation direction and speed of the male rotor.

[0016] A second aspect of this utility model provides a screw compressor, comprising:

[0017] A housing, wherein a rotor cavity is formed within the housing, and the rotor cavity has an intake port and an exhaust port;

[0018] The male rotor is connected to a compressor motor and rotates in the forward or reverse direction under the drive of the compressor motor.

[0019] The female rotor is disposed within the rotor cavity and meshes with the male rotor.

[0020] An anti-reverse structure is fixedly sleeved on the male rotor.

[0021] A third aspect of this utility model provides a refrigeration device, including the screw compressor described in the above embodiments.

[0022] Compared with the prior art, this utility model brings the following technical effects:

[0023] This invention features an anti-reverse rotation structure fixedly mounted on the male rotor of a screw compressor. The fan blades are asymmetrically positioned with their windward and leeward sides, creating a pressure difference between them. The rotation of the fan blades generates a directional airflow. When the screw compressor rotates forward, the fan-driven fluid flows from the intake port to the exhaust port in a forward airflow. When the screw compressor reverses due to an malfunction, the fan-driven fluid flows from the exhaust port to the intake port in a reverse airflow, generating a counterforce to counteract the reverse rotation tendency of the male rotor, causing the compressor to return to forward rotation. This ensures stable and reliable operation of the rotor compressor and extends its service life. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 The diagram shows a schematic representation of the anti-reverse structure of some embodiments of the present invention.

[0026] Figure 2 A schematic diagram of the anti-reverse structure from another perspective of some embodiments of the present invention is shown;

[0027] Figure 3 The diagram shows a schematic representation of the anti-reverse structure in its extended state according to some embodiments of the present invention.

[0028] Figure 4 The diagram shows a schematic representation of the anti-reversal structure in its contracted state according to some embodiments of the present invention.

[0029] Figure 5 A schematic diagram of the working principle of a screw compressor in forward rotation state according to some embodiments of the present invention is shown (female rotor omitted);

[0030] Figure 6 A schematic diagram of the working principle of a screw compressor in reverse state according to some embodiments of the present invention is shown (the female rotor is omitted).

[0031] Explanation of key component symbols:

[0032] 100-Anti-reverse structure; 10-Shaft sleeve; 20-Fan blade; 21-Windward side; 22-Leaning side; 30-Elastic element; 210-Compressor motor; 220-Male rotor; 300-Housing; 310-Rotor cavity; 311-Intake port; 312-Exhaust port. Detailed Implementation

[0033] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0035] Please see Figures 1-6 This utility model provides an anti-reverse rotation structure 100 for a screw compressor. The screw compressor housing 300 forms a rotor cavity 310, which has an intake port 311 and an exhaust port 312. The anti-reverse rotation structure 100 includes a bushing 10 and fan blades 20. The bushing 10 is fixedly sleeved on the male rotor 220 of the screw compressor. Multiple fan blades 20 are arranged at intervals along the circumference of the bushing 10, and the fan blades 20 are asymmetrically arranged. When the male rotor 220 of the screw compressor rotates forward, the driving fluid flows from the intake port 311 to the exhaust port 312. When the screw compressor rotates in reverse, the driving fluid flows from the exhaust port 312 to the intake port 311.

[0036] The anti-reverse rotation structure 100 of this invention is fixedly sleeved on the male rotor 220 of the screw compressor. The windward side 21 and leeward side 22 of the fan blades 20 are asymmetrically arranged. Because a pressure difference is formed between the leeward side 22 and the windward side 21 of the fan blades 20, the rotation of the fan blades 20 generates a directional airflow. When the screw compressor rotates forward, the fan blades 20 drive the fluid to flow from the intake port 311 to the exhaust port 312 in a forward airflow. When the screw compressor reverses due to an abnormality, the fan blades 20 drive the fluid to flow from the exhaust port 312 to the intake port 311 in a reverse airflow, generating a counterforce to counteract the reverse rotation tendency of the male rotor 220, causing the compressor to return to a forward rotation state. This ensures stable and reliable operation of the rotor compressor and a long service life.

[0037] In short, the contribution of this utility model to the prior art is that the direction of airflow in the compressor rotor cavity 310 is determined by the asymmetrical arrangement of the fan blades 20 and the rotation direction of the male rotor 220, so as to solve the problem of the male rotor 220 of the compressor reversing.

[0038] Specifically, the windward side 21 of the fan blade 20 faces the intake port 311, and the leeward side 22 faces the exhaust port 312. The windward side 21 of the fan blade 20 is convex, while the leeward side 22 is relatively flat or concave. Thus, a pressure difference is generated between the windward side 21 and the leeward side 22 of the fan blade 20 due to their different curvatures, which drives the airflow to move axially in a directional direction. Both the windward side 21 and the leeward side 22 of the fan blade 20 are considered in relation to the forward rotation of the screw compressor, with the airflow moving from the intake port 311 to the exhaust port 312.

[0039] Furthermore, when the compressor reverses, the lubricating oil will flow in the opposite direction with the gas, resulting in a lack of lubrication for critical parts (bearings, etc.). The fan blade 20 of this invention can prevent the compressor from reversing and prevent the lubricating oil from flowing in the opposite direction, thus playing a certain role in blocking oil flow.

[0040] The bushing 10 is a circular hollow cylinder that serves as the mounting base for the fan blades 20. Each fan blade 20 is inclined on the outer wall of the bushing 10, and the inclination angle of each fan blade 20 is the same. The fan blades 20 are fixedly sleeved on the bushing 10 so that when the fan blades 20 reverse, they can drive the male rotor 220 to move synchronously through the bushing 10.

[0041] The fan blades 20 are made of a rigid material that hardly deforms during operation. For example, the fan blades 20 can be made of aluminum alloy, titanium alloy, or stainless steel.

[0042] In one specific embodiment, the fan blades 20 are hinged to the bushing 10. Each fan blade 20 can switch between an extended state and a retracted state. The fan blades 20 rotate to be distributed circumferentially along the bushing 10 to achieve an extended state; the fan blades 20 rotate to be distributed around the bushing 10 to achieve a retracted state. When the screw compressor reverses direction, the fan blades 20 switch from the retracted state to the extended state due to the centrifugal force generated by their own rotation. Specifically, when the male rotor 220 rotates forward, the fan blades 20 switch to the retracted state; when the male rotor 220 rotates in reverse direction, the fan blades 20 switch to the extended state.

[0043] Understandably, the rotation of the fan blade 20 has a fixed direction and a fixed angle. The direction of rotation of the fan blade 20 is only around the axis of the bushing 10, and the range of rotation is α, °0≤α≤90°. For example, the fan blade 20 can rotate to 0°, 30°, 45°, 60°, 75° or 90°.

[0044] When the screw compressor reverses direction, the fan blades 20 are subjected to an outward centrifugal force due to rotation, causing them to rotate from a contracted state to an extended state. As the screw compressor continues to reverse, the centrifugal force persists, and the extended fan blades 20 experience a pulling force of the same magnitude but opposite direction, keeping the fan blades 20 relatively stationary with respect to the bushing 10. When the screw compressor's reverse rotation speed decreases or stops, the centrifugal force on the fan blades 20 weakens or disappears, and the fan blades 20 move towards a contracted state under the pulling force, or directly switch to a contracted state.

[0045] The anti-reverse rotation structure 100 in this embodiment is hinged to the bushing 10 via the fan blade 20. When the compressor rotates forward, the refrigerant and injected refrigeration oil are quickly drawn into the rotor cavity 310 and evenly distributed by the rotation of the fan blade 20. This prevents some areas from becoming too cold or too hot, thus avoiding excessive load and accelerated wear. The compressor has high overall efficiency and a long service life. Furthermore, due to the pressure difference between the compressor's intake and exhaust, the refrigerant and refrigeration oil do not excessively consume compressor power when passing through the fan blade 20.

[0046] In an alternative embodiment, the fan blade 20 of the anti-reverse structure 100 is fixedly connected to the bushing 10. That is, the fan blade 20 cannot rotate relative to the bushing 10. The anti-reverse structure 100 of this embodiment can still generate reverse airflow when the compressor reverses, and gradually restore the compressor from reverse rotation to forward rotation, so that the compressor operates stably and reliably and has a long service life.

[0047] Furthermore, the bushing 10 is directly connected to the fan blade 20. For example, the fan blade 20 is provided with a pin, and the bushing 10 is provided with a matching insertion hole. In this way, the fan blade 20 can be rotated by assembling only two parts, the bushing 10 and the fan blade 20, resulting in a simple and compact structure.

[0048] In an alternative embodiment, the fan blade 20 is connected to the bushing 10 via a hinge. Alternatively, the fan blade 20 is connected to the bushing 10 via a pivot. This arrangement of hinge and pivot reduces wear during relative movement between the fan blade 20 and the bushing 10, thereby increasing the service life of the fan blade 20.

[0049] In one specific embodiment, the anti-reverse structure 100 further includes an elastic element 30, one end of which is connected to the bushing 10 and the other end is connected to the fan blade 20, and the elastic element 30 and the fan blade 20 are arranged in a one-to-one correspondence.

[0050] In this embodiment, there are six fan blades 20 and six elastic elements 30. Of course, the number of fan blades 20 and elastic elements 30 is not limited to the specific limitation of this embodiment.

[0051] The elastic force of the elastic element 30 is configured to be slightly less than the centrifugal force experienced by the fan blade 20 when the compressor reverses direction, and slightly greater than the centrifugal force experienced by the compressor when it rotates forward. Thus, when the compressor reverses direction, the fan blade 20 can overcome the deformation of the elastic element 30 and switch from a contracted state to an extended state. When the compressor rotates forward, the elastic force of the elastic element 30 keeps the fan blade 20 in a contracted state. In this way, when the compressor rotates forward, the fan blade 20 remains in contact with the sleeve under the constraint of the elastic element 30, ensuring a stable and reliable airflow environment within the rotor cavity 310 and extending the service life of the fan blade 20.

[0052] Furthermore, the elastic element 30 is a tension spring, which has the tendency to drive the fan blade 20 from the extended state to the contracted state.

[0053] When the fan blade 20 is in the contracted state, the tension spring is in its naturally extended state. At this time, the tension spring has an initial tension. During the process of the fan blade 20 switching from the contracted state to the extended state, the elastic force provided by the tension spring continuously increases with the degree of stretching. In this way, the tension spring can cope with certain rapid movements of the fan blade 20, so that the fan blade 20 is in the contracted state more stably and reliably when the compressor is rotating forward.

[0054] In one specific embodiment, the fan blade 20 is twistedly disposed on the bushing 10, and the twisting direction of the fan blade 20 is the same as the forward rotation direction of the male rotor 220.

[0055] The installation angle of the fan blade 20 has a significant impact on the air outlet efficiency, but it does not affect the air outlet direction of the fan blade 20. By twisting the fan blade 20 so that its twisting direction is the same as the forward rotation direction of the male rotor 220, the impact on airflow efficiency is minimized during normal operation of the compressor, and the fan blade 20 can be opened more effectively during reverse rotation to prevent the compressor from reversing.

[0056] In an alternative embodiment, the fan blade 20 is connected to a power mechanism (not shown) for adjusting the deflection angle of the fan blade 20 relative to the bushing 10. The power mechanism is controlled by a reverse rotation monitoring device (not shown), which is used to detect the rotation direction and speed of the male rotor 220.

[0057] The rotation direction and speed of the male rotor 220 are monitored through the cooperation of the power mechanism and the reversal detection device. When the reversal detection device confirms that the male rotor 220 is rotating in reverse, the power mechanism drives the fan blade 20 to rotate and extend circumferentially along the bushing 10 to achieve an extended state. When the reversal detection device confirms that the male rotor 220 is rotating forward, the power mechanism drives the fan blade 20 to rotate around the bushing 10 to achieve a retracted state. That is, an electronic control method is used to replace the mechanical structure (such as the elastic element 30) to control the expansion or retraction of the fan blade 20.

[0058] Specifically, the power mechanism can be a drive motor. The reverse rotation monitoring device can be a speed sensor.

[0059] To resolve the above issues, please refer to [link / reference]. Figures 1-6 The second aspect of this utility model provides a screw compressor, comprising a housing 300, a male rotor 220, a female rotor, and an anti-reverse rotation structure 100. A rotor cavity 310 is formed within the housing 300, and the rotor cavity 310 has an intake port 311 and an exhaust port 312. The male rotor 220 is connected to a compressor motor 210 and rotates in the forward or reverse direction under the drive of the compressor motor 210. The female rotor is disposed within the rotor cavity 310 and meshes with the male rotor 220. The anti-reverse rotation structure 100 is fixedly sleeved on the male rotor 220.

[0060] This invention relates to a screw compressor that employs an anti-reverse rotation structure 100, as described in any of the above embodiments, fixedly mounted on the male rotor 220 of the screw compressor. The fan blades 20 have an asymmetrical arrangement of their windward and leeward sides 21. Because a pressure difference exists between the leeward and windward sides 21 of the fan blades 20, the rotation of the fan blades 20 generates a directional airflow. When the screw compressor rotates forward, the fan blades 20 drive the fluid to flow from the intake port 311 to the exhaust port 312 in a forward airflow. When the screw compressor reverses due to an abnormality, the fan blades 20 drive the fluid to flow from the exhaust port 312 to the intake port 311 in a reverse airflow, generating a counterforce to counteract the reverse rotation tendency of the male rotor 220, thus restoring the compressor to a forward rotation state. This results in a stable and reliable operation of the rotor compressor, and a long service life.

[0061] Furthermore, when the compressor reverses, the lubricating oil will flow in the opposite direction with the gas, resulting in a lack of lubrication for critical parts (bearings, etc.). The fan blade 20 structure of this patent can prevent the compressor from reversing and prevent the lubricating oil from flowing in the opposite direction, thus playing a certain role in blocking oil.

[0062] See Figure 5 The compressor motor 210 rotates clockwise (forward rotation) and counterclockwise (reverse rotation). When the compressor motor 210 rotates clockwise, i.e., when the compressor is rotating forward, the centrifugal force on the fan blades 20 of the anti-reverse rotation structure 100 is less than the elastic force provided by the tension spring, and the fan blades 20 remain in a contracted state. Figure 5 The direction of the middle arrow indicates the direction of flow of the gas-liquid mixture.

[0063] Combination Figure 6As shown, when the compressor motor 210 rotates counterclockwise, it drives the male rotor 220 to rotate counterclockwise, and the fan blades 20 are also driven to rotate counterclockwise by the male rotor 220, switching from a contracted state to an extended state. High-pressure air combines with coolant to form a gas-liquid mixture, which enters the rotor cavity 310 from the outside through the exhaust port 312 and impacts the fan blades 20. The windward side 21 and the leeward side 22 of the fan blades 20 generate opposing airflows, which flow from the rotor cavity 310 towards the exhaust port 312. These opposing airflows generate a reverse pressure difference to reduce the pressure difference caused by the compressor's reverse rotation. When the reverse pressure difference is greater than the pressure difference caused by the compressor's reverse rotation, the compressor changes from reverse rotation to forward rotation. Figure 6 The direction of the middle arrow indicates the direction of flow of the gas-liquid mixture.

[0064] Please see Figures 1-6 In a third aspect, this utility model provides a refrigeration device, which includes a screw compressor according to any of the above embodiments.

[0065] The refrigeration equipment of this utility model employs a rotor compressor with an anti-reverse rotation structure 100 as described in any of the above embodiments. The anti-reverse rotation structure 100 is fixedly sleeved on the male rotor 220 of the screw compressor, and the windward side 21 and leeward side 22 of the fan blades 20 are asymmetrically arranged. Because a pressure difference is formed between the leeward side 22 and the windward side 21 of the fan blades 20, the rotation of the fan blades 20 generates a directional airflow. When the screw compressor rotates forward, the fan blades 20 drive the fluid to flow from the intake port 311 to the exhaust port 312 in a forward airflow. When the screw compressor reverses due to an abnormality, the fan blades 20 drive the fluid to flow from the exhaust port 312 to the intake port 311 in a reverse airflow, generating a counterforce to counteract the reverse rotation tendency of the male rotor 220, causing the compressor to return to the forward rotation state. The refrigeration equipment operates stably and reliably, and has a long service life.

[0066] Specifically, the refrigeration equipment can be an air conditioner, refrigerator, or freezer.

[0067] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom still fall within the protection scope of this invention.

Claims

1. An anti-reverse rotation structure for a screw compressor, wherein a rotor cavity is formed within the housing of the screw compressor, the rotor cavity having an intake port and an exhaust port, the anti-reverse rotation structure comprising a bushing and fan blades, the bushing being fixedly fitted onto the male rotor of the screw compressor, and a plurality of fan blades being arranged at circumferential intervals along the bushing, characterized in that, The fan blades are asymmetrically shaped. When the male rotor of the screw compressor rotates forward, the driving fluid flows from the intake port to the exhaust port. When the screw compressor rotates in reverse, the driving fluid flows from the exhaust port to the intake port.

2. The reverse prevention structure according to claim 1, wherein The fan blades are hinged to the bushing, wherein each fan blade is capable of switching between an extended state and a retracted state. Each fan blade rotates to extend along the axial direction of the bushing to achieve the extended state; the fan blades rotate to the periphery of the bushing to achieve the retracted state. Specifically, when the male rotor rotates forward, the fan blades switch to the contracted state; when the male rotor rotates in reverse, the fan blades switch to the extended state.

3. The reverse prevention structure according to claim 2, wherein It also includes an elastic element, one end of which is connected to the bushing and the other end of which is connected to the fan blade; the elastic element and the fan blade are arranged in a one-to-one correspondence.

4. The reverse prevention structure according to claim 3, wherein The elastic element is a tension spring, which has the tendency to move the fan blade from the extended state to the contracted state.

5. The reverse prevention structure according to claim 1, wherein The fan blades are twistedly mounted on the bushing, and the twisting direction of the fan blades is the same as the forward rotation direction of the male rotor.

6. The reverse prevention structure according to claim 2, wherein The fan blade is directly connected to the bushing, or the fan blade and the bushing are connected by a hinge or a rotating shaft.

7. The reverse prevention structure according to claim 1, wherein The windward side of the fan blade faces the air intake, and the leeward side faces the exhaust. The windward side of the fan blade is convex, and the leeward side of the fan blade is relatively flat or concave.

8. The reverse prevention structure according to claim 2, wherein The fan blade is connected to a power mechanism for adjusting the deflection angle of the fan blade relative to the bushing. The power mechanism is controlled by a reverse rotation monitoring device, which is used to detect the rotation direction and speed of the male rotor.

9. Screw compressor, characterized in that include: A housing, wherein a rotor cavity is formed within the housing, and the rotor cavity has an intake port and an exhaust port; The male rotor is connected to a compressor motor and rotates in the forward or reverse direction under the drive of the compressor motor. The female rotor is disposed within the rotor cavity and meshes with the male rotor. The anti-reverse structure according to any one of claims 1 to 8 is fixedly sleeved on the male rotor.

10. A refrigeration appliance characterized in that, Including the screw compressor as described in claim 9.

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