Screw compressor, apparatus having same and use method therefor

Abstract

A screw compressor, an apparatus having same, and a use method therefor. The screw compressor is internally provided with a cooling structure; a chamber body (400) of the cooling structure is provided with hollowed-out portions (430), and the chamber body (400) is provided with a physical structure located among the hollowed-out portions (430), thereby enhancing the structural strength of the chamber body (400) while dividing the chamber body (400) into a plurality of independent hollowed-out portions (430) in communication with each other, which helps to increase a flow rate and flow uniformity of a cooling medium and enhance a cooling effect, thereby effectively controlling casing deformation caused by temperature.

Description

Screw compressor, equipment having the same, and method of use

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 26, 2023, with application number 202310761261.4 and application name “Screw compressor, equipment with the same and method of use”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the technical field of compressors, and in particular to a screw compressor, a device having the same, and a method of using the same. Background Art

[0003] Screw compressors are a type of positive displacement compressor, usually classified into two categories: oil-injected screws and oil-free screws. Oil-injected screw compressors are mainly used for gas boosting in the air and refrigeration fields, and their working medium is friendly; oil-free screw compressors are usually used for process gas boosting in the fields of petrochemicals, natural gas, shipping, electronics, and food. The medium is mostly flammable and explosive gases, and the application environment is special, often requiring customized design. Among them, oil-free screw compressors are divided into two types: liquid injection and dry type. Liquid injection oil-free screw compressors are designed to meet the needs of large petrochemical plants. During the boosting process, they spray water or diesel into the medium gas for cooling, which can achieve a single-stage high pressure ratio; dry oil-free screw compressors are designed to ensure the purity of the medium gas. No cooling liquid is sprayed on the medium, and the boosting process can achieve high-purity gas compression. Currently, they have become the preferred model in the fields of food, electronics, natural gas liquefaction, etc.

[0004] In dry-type oil-free screw compressors, to prevent the medium gas from being contaminated, there is no liquid cooling or sealing between the rotors, resulting in significant leakage losses. To maintain a certain volumetric efficiency, the speed must be increased to reduce leakage. Therefore, the most notable feature of dry-type oil-free screw compressors is their high speed, which leads to higher medium gas temperatures and, consequently, deformation of the casing.

[0005] It can be seen from this that although dry oil-free screw compressor units have been widely used in industry, in the field of high-purity gas boosting, the existing structure cannot meet the application requirements and still faces great challenges in terms of shell cooling.

[0006] Summary of the Invention

[0007] Embodiments of the present application provide a screw compressor, a device having the same, and a method of use to improve the cooling effect of the screw compressor.

[0008] An embodiment of the present application provides a screw compressor, comprising a main body, a screw and a cooling structure, wherein the main body has a screw working chamber; the screw has a spiral section, which is located in the screw working chamber; the cooling structure is arranged on the outside of the main body to form a cooling chamber between the main body and the cooling structure, wherein the cooling chamber is used to pass a cooling medium, and the radial projection of the cooling chamber in the screw direction covers at least a portion of the spiral section.

[0009] In some embodiments, the cooling structure includes a chamber body and a sealing plate; the chamber body is arranged on the outside of the main body, and is provided with a plurality of hollow portions arranged at intervals thereon, and the hollow portions penetrate the chamber body along the radial direction of the screw, and the cooling chamber includes a space between the chamber body and the main body and a space within the hollow portions; the sealing plate is located on the side of the chamber body away from the screw, and the sealing plate is installed on the chamber body to close the side of the hollow portion away from the screw.

[0010] In some embodiments, the chamber body includes a bottom connecting surface and a side connecting surface, the bottom connecting surface is located at the bottom of the body, the side connecting surface is located on the radial side of the body, and the hollow portion is provided on both the bottom connecting surface and the side connecting surface.

[0011] In some embodiments, the screw compressor is also provided with a cooling liquid circulation pipeline, and a first opening and a second opening are provided on the sealing plate, the first opening and the second opening are connected to the cooling chamber, and the cooling chamber is configured in the cooling liquid circulation pipeline through the first opening and the second opening.

[0012] In some embodiments, a foot is provided on the main body, and an anchor bolt hole is provided on the foot. The anchor bolt hole vertically penetrates the foot, and the anchor bolt hole extends along the axial direction of the screw rod to have a first length in the axial direction.

[0013] In some embodiments, the main body includes an air intake end seat and an exhaust end seat connected in sequence along the axial direction of the screw, and the screw includes a first screw and a second screw, wherein the air intake end seat has a first bearing cavity; the exhaust end seat has a second bearing cavity, and the screw working cavity is located in the exhaust end seat; one of the first screw and the second screw has a female rotor, and the other has a male rotor, the female rotor and the male rotor are meshed with each other, and the female rotor and the male rotor are the spiral section, and the two ends of the first screw and the second screw are rotatably fitted in the first bearing cavity and the second bearing cavity.

[0014] In some embodiments, the gear ratio of the female rotor to the male rotor ranges from 3:4 to 3:5, and the single-stage pressure ratio of the screw compressor does not exceed 4.

[0015] In some embodiments, a first anchor bolt hole is provided on the air inlet end seat, the first anchor bolt hole vertically penetrates the air inlet end seat, and the first anchor bolt hole extends along the axial direction of the screw rod; and / or, a second anchor bolt hole is provided on the exhaust end seat, the second anchor bolt hole vertically penetrates the exhaust end seat, and the second anchor bolt hole extends along the axial direction of the screw rod.

[0016] In some embodiments, a first connecting flange is provided on the air inlet end seat, the first connecting flange has an inlet, and the inlet faces the radial direction of the screw; a second connecting flange is provided on the air exhaust end seat, the second connecting flange has an outlet, and the outlet faces the radial direction of the screw.

[0017] In some embodiments, the screw compressor further includes an exhaust end cover, which is arranged at an end of the exhaust end seat away from the intake end seat. The exhaust end cover is provided with a connecting end surface on a side away from the exhaust end seat, and the connecting end surface is used to connect to a driving mechanism.

[0018] In some embodiments, the screw compressor also includes a coupling and a coupling guard, the coupling is located in the coupling guard, the coupling guard includes a first end and a second end relative to each other, and an opening is also provided on the connecting end surface, the screw is passed through the opening and connected to the coupling, wherein a first positioning step is provided at the first end, and the first positioning step is sleeved on the connecting end surface; and / or a second positioning step is provided at the second end, and the second positioning step is used to be sleeved on the driving mechanism.

[0019] Correspondingly, an embodiment of the present application further provides an apparatus comprising the aforementioned screw compressor and a drive mechanism, wherein the drive mechanism is connected to the screw of the screw compressor.

[0020] Correspondingly, an embodiment of the present application also provides a method for using the aforementioned screw compressor, which includes introducing a cooling medium into a cooling chamber and allowing the cooling medium to flow between the various hollow portions of the cooling chamber to cool the main body of the screw compressor. Beneficial effects

[0021] An embodiment of the present application provides a screw compressor, an apparatus having the same, and a method of use. A cooling structure is provided in the screw compressor, and a hollow portion is provided on the chamber body of the cooling structure. The chamber body has a solid structure located between the hollow portions, thereby strengthening the structural strength of the chamber body and also dividing the chamber body into a number of independent hollow portions that are interconnected. The cooling medium can pass through these independent hollow portions in turn, ensuring that the cooling medium can flow to all parts of the chamber body, and helping to increase the flow rate and flow uniformity of the cooling medium, and enhance the cooling effect, thereby effectively controlling the shell deformation caused by temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] FIG1 exemplarily shows a structural diagram of a screw compressor;

[0024] FIG2 exemplarily shows a structural schematic diagram of a screw compressor from another perspective;

[0025] FIG3 exemplarily shows a structural diagram of an air inlet end seat;

[0026] FIG4 exemplarily shows a structural diagram of an air inlet end seat from another perspective;

[0027] FIG5 exemplarily shows a structural diagram of an air intake end cover;

[0028] FIG6 exemplarily shows a schematic structural diagram of an exhaust end seat;

[0029] FIG7 exemplarily shows a schematic structural diagram of an exhaust end seat from another perspective;

[0030] FIG8 exemplarily shows a structural diagram of a sealing plate located on the side;

[0031] FIG9 exemplarily shows a structural schematic diagram of a sealing plate located at the bottom;

[0032] FIG10 exemplarily shows a schematic structural diagram of a screw compressor equipped with a coupling protection cover;

[0033] FIG11 exemplarily shows a schematic structural diagram of an exhaust end cover;

[0034] FIG12 exemplarily shows a schematic structural diagram of a coupling protective cover;

[0035] FIG13 exemplarily shows a schematic structural diagram of a screw;

[0036] FIG14 exemplarily shows a schematic structural diagram of a synchronous gear.

[0037] The main elements in this application are marked with the following figures: main body-10, air inlet seat-100, air inlet-110, first bearing cavity-120, balancing air port-130, low-pressure end sealing air inlet-140, low-pressure end lubricating oil inlet-150, bearing oil return port-160, low-pressure end bearing temperature measuring port-170, first anchor bolt hole-180, air inlet end cover-190, synchronous gear oil inlet-191, balancing plate hole-192, tail cover-193, exhaust end seat-200, exhaust port-210, second bearing cavity-220, sealed balancing cavity-230, high-pressure end sealing air inlet-240, high-pressure end lubricating oil inlet-250, screw working Working chamber 260, high-pressure end bearing temperature measuring port 270, second anchor bolt hole 280, exhaust end cover 290, shaft hole 291, connecting end face 292, support point 293, oil return port 294, screw 300, first screw 310, second screw 320, chamber body 400, bottom connecting surface 410, side connecting surface 420, hollow part 430, sealing plate 500, opening 510, coupling guard 600, first end 610, first positioning step 611, second end 620, second positioning step 621, synchronous gear 700, large gear 710, small gear 720.

[0038] Implementation Methods of the Application

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "up", "down", "left", and "right", generally refer to the up, down, left, and right of the device in actual use or working state, specifically the drawing direction in the accompanying drawings.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include at least one of these features.

[0041] This application provides a screw compressor, an apparatus having the same, and a method for using the same, which are described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the description of each embodiment has its own emphasis. For portions not detailed in one embodiment, please refer to the relevant descriptions of other embodiments.

[0042] An embodiment of the present application provides a screw compressor, wherein the screw compressor includes a stationary part and a rotating part. Please refer to Figures 1 and 2. The stationary part is the main body 10 of the screw compressor, which mainly includes an air intake end seat 100 and an exhaust end seat 200, and the rotating part mainly includes a screw 300. Here, the main body 10 is a two-section structure of the air intake end seat 100 and the exhaust end seat 200. This structure helps to ensure the concentricity of the screw compressor, reduce processing and assembly errors, and also helps to simplify the assembly process. Of course, in other embodiments, the structure of the main body 10 is not limited to this, and the example in this embodiment does not constitute an undue limitation thereto.

[0043] In addition, in the embodiments of the present application, the screw compressor adopts a two-stage structure, which helps to ensure concentricity, reduce processing and assembly errors, and simplify the assembly process.

[0044] The anchor bolt holes of the screw compressor can be large-clearance round holes or oblong holes, thereby releasing the displacement of the screw compressor caused by thermal expansion, helping to reduce stress concentration and improve equipment reliability.

[0045] A coupling guard and a connection end face can be provided at the exhaust end cover of the exhaust end seat to achieve safety protection of the high-speed coupling and ensure shaft alignment between the compressor and the drive structure.

[0046] Here, in order to facilitate the description of the positional relationship of each component, in the embodiment of the present application, the screw 300 is defined as having an axis, and the screw 300 and its axis are defined as axial, radial and circumferential. Here, the axial direction refers to the extension direction of the axis, the radial direction refers to the direction perpendicular to the axis, and the circumferential direction refers to the direction of the circumferential line extending concentrically around the axis. In an embodiment in which the screw 300 includes multiple screws, for example, in an embodiment in which the screw 300 includes a first screw 310 and a second screw 320, the axes of each screw 300 are parallel, and the above-mentioned direction can be defined by one of the screws 300, for example, the above-mentioned direction can be defined by the second screw 320 connected to a drive mechanism such as a motor, that is, the aforementioned axis can refer to the axis of the second screw 320. Of course, the examples in this embodiment do not constitute an undue limitation to this application.

[0047] Here, please refer to Figures 3 and 4. The air inlet end seat 100 has an air inlet 110. The air inlet 110 is mainly used to send the gas to be compressed into the screw compressor to ensure smooth air intake of the compressor. In some embodiments, the air inlet 110 faces the radial direction. For example, the air inlet 110 can be located above the air inlet end seat 100, thereby achieving the beneficial effect of facilitating pipeline connection. It can be understood that in the embodiments of the present application, unless otherwise specified, extending along a certain direction or facing a certain direction, etc., refers to extending along a direction parallel to or coinciding with the direction or facing a direction parallel to or coinciding with the direction. For example, here the air inlet 110 faces the radial direction, which means that the air inlet 110 faces a direction parallel to or coinciding with the radial direction.

[0048] At the same time, the air inlet end seat 100 has a first bearing cavity 120, which is used to rotatably connect the aforementioned screw 300. For example, a bearing can be provided in the first bearing cavity 120 to cooperate with the screw 300. Referring to Figure 3, in the embodiment in which the first screw 310 and the second screw 320 are provided, the first bearing cavity 120 is correspondingly two adjacent accommodating spaces, which can be connected or not connected. Of course, it is understood that in other embodiments, the first bearing cavity 120 can also be provided as a single integral space to accommodate and assemble the screw 300, and the example in this embodiment does not constitute an undue limitation thereto.

[0049] In addition, in order to achieve corresponding functions and technical effects, corresponding components and structures can be additionally provided on the air inlet end seat 100. For example, in some embodiments, a balancing chamber can be further provided in the air inlet end seat 100, and the balancing chamber is connected to the air inlet 110. For example, the balancing chamber has a balancing gas port 130, and the balancing gas port 130 is provided on one side of the air inlet 110 and is connected to the air inlet 110. Here, the balancing chamber is used to connect to the sealed balancing chamber 230 at the exhaust end seat 200 (see FIG. 7 ) to reduce the pressure in the sealed balancing chamber 230 at the exhaust end seat 200. It is understood that this is not limited to connecting to the sealed balancing chamber 230. In other embodiments, the balancing chamber can also be connected to other locations. The examples in this embodiment do not constitute an undue limitation to this application.

[0050] In some embodiments, in order to achieve a sealing effect, see Figures 3 and 4, low-pressure end sealing gas inlets 140 can also be provided on both sides of the air inlet end seat 100 to inject nitrogen or other gases into the air inlet end seat 100 as sealing gas.

[0051] In some embodiments, to achieve lubrication, as shown in Figures 3 and 4 , low-pressure lubricating oil inlets 150 may be provided on either side of the intake end seat 100. These low-pressure lubricating oil inlets 150 are connected to the bearings within the intake end seat 100 for supplying oil to the bearings. Optionally, a bearing oil return port 160 may be provided below the intake end seat 100 for lubricating oil to flow out. The bearing oil return port 160 may also be connected to the low-pressure lubricating oil inlet 150 via a pipeline, forming a circulation loop and enabling the reuse of the lubricating oil.

[0052] In some embodiments, in order to monitor the operating status of the bearing in real time, a low-pressure end bearing temperature measuring port 170 can also be set on the air inlet end seat 100. The low-pressure end bearing temperature measuring port 170 can extend the temperature measuring device into the bearing position inside the air inlet end seat 100 to detect the temperature.

[0053] In some embodiments, referring to FIG. 3 , a first anchor is provided on the intake end seat 100, and a first anchor bolt hole 180 is provided on the first anchor. Typically, the first anchor bolt hole 180 is located at the bottom of the intake end seat 100, vertically extending through the first anchor and along the axial direction of the screw 300. In other words, the first anchor bolt hole 180 has a first length in the axial direction that is longer than the length of the anchor bolt. Thus, the first anchor bolt hole 180 can accommodate potential slippage of the intake end seat 100 due to thermal expansion and contraction. For example, the first anchor bolt hole 180 can be a large-clearance circular hole or an oblong hole.

[0054] In some embodiments, please refer to Figure 5, an air intake end cover 190 may also be provided. In conjunction with Figure 1, the air intake end cover 190 is provided at one end of the air intake end seat 100 away from the exhaust end seat 200. Please continue to refer to Figure 5, a synchronous gear oil inlet 191 may be provided on the air intake end cover 190 to allow oil to enter for lubrication and cooling, etc. A balancing disk hole 192 may also be provided on the air intake end cover 190 to facilitate the installation of a balancing disk. In addition, the direction of rotation of the rotor may be marked on the air intake end cover 190 for user installation and observation. Also, please refer to Figure 2, a tail cover 191 may also be provided at the end of the air intake end cover 190 away from the air intake end seat 100, and the tail cover 191 may shield and protect the first bearing cavity 120 and surrounding components.

[0055] Please refer to Figure 1. The exhaust end seat 200 of the main body 10 is axially arranged on one side of the inlet end seat 100. It is the main structure for achieving supercharging. Here, please refer to Figures 6 and 7. The exhaust end seat 200 has an exhaust port 210. Among them, the exhaust port 210 is mainly used to send the compressed gas out of the screw compressor to ensure smooth exhaust of the compressor. In some embodiments, the exhaust port 210 is oriented in the radial direction. For example, the exhaust port 210 can be located above the exhaust end seat 200, thereby achieving the beneficial effect of facilitating pipeline connection.

[0056] Here, a second bearing cavity 220 is further provided in the exhaust end seat 200. The second bearing cavity 220 is used to rotatably connect the aforementioned screw 300. For example, a bearing may be provided in the second bearing cavity 220 to cooperate with the screw 300. Referring to FIG6 , in the embodiment in which the first screw 310 and the second screw 320 are provided, the second bearing cavity 220 is correspondingly two adjacent accommodating spaces, which may be connected or not connected. Of course, it is understood that in other embodiments, the second bearing cavity 220 may also be provided as a single integral space to accommodate and assemble the screw 300. The example in this embodiment does not constitute an undue limitation thereto.

[0057] Furthermore, the exhaust end block 200 further includes a screw working chamber 260, which is located between and communicates with the first bearing chamber 120 and the second bearing chamber 220. In other words, the first bearing chamber 120, the screw working chamber 260, and the second bearing chamber 220 are sequentially arranged along the axial direction. The screw working chamber 260 is located at the end of the exhaust end block 200 that is closer to the inlet end block 100, while the second bearing chamber 220 is located at the end of the exhaust end block 200 that is farther from the inlet end block 100.

[0058] The screw working chamber 260, where the spiral section of the screw 300 is located, compresses the working medium, such as air. The structure of the exhaust end seat 200 will be discussed further below, with the detailed structure of the screw 300 to be discussed later. As the screw 300 operates, the pressure and temperature of the working medium rise, transferring a significant amount of heat to the main body 10, particularly to the exhaust end seat 200 at the location of the screw working chamber 260. This can cause deformation of the main body 10, particularly the exhaust end seat 200, due to the heat.

[0059] To this end, in an embodiment of the present application, the screw compressor also includes a cooling structure, which is arranged on the outside of the main body 10 to form a cooling chamber between the main body 10 and the cooling structure. The cooling chamber is used to pass a cooling medium, where the cooling medium can be a liquid or a gas, and this embodiment does not constitute an undue restriction on it. And the projection of the cooling chamber in the radial direction of the screw 300 covers a part of the spiral section of the screw 300. Thus, through the setting of the cooling structure, the cooling medium in the cooling chamber can cool the main body 10 and take away the heat of the main body 10 to prevent the main body 10 from deforming. Of course, it is understandable that in other embodiments, the cooling chamber can also be set so that its projection in the radial direction of the screw 300 completely covers the spiral section of the screw 300, thereby better taking away the heat at the spiral section.

[0060] Here, referring to FIG6 , the cooling structure includes a chamber body 400, wherein the chamber body 400 includes a bottom connecting surface 410 and a side connecting surface 420. The bottom connecting surface 410 is located at the bottom of the main body 10, and there are two side connecting surfaces 420, each located on a radial side of the main body 10. The planes on which the bottom connecting surface 410 and the side connecting surface 420 are located are substantially parallel to the axial direction. Here, the bottom connecting surface 410 and the side connecting surface 420 are integrally formed on the shell of the exhaust end seat 200, that is, the bottom connecting surface 410 and the side connecting surface 420 can be an integral part of the main body 10 in terms of physical structure. Of course, in other embodiments, a bottom plate having a bottom connecting surface and a side panel having a side connecting surface can also be provided, and the bottom plate and the side panel can be connected to the exhaust end seat 200 by welding or other means. The example in this embodiment does not constitute an undue limitation thereto.

[0061] A hollow portion 430 is provided on both the bottom connecting surface 410 and the side connecting surface 420. The bottom connecting surface 410 and the side connecting surface 420 may be provided with only one hollow portion 430, or may be provided with a plurality of hollow portions 430 spaced apart, which is not limited in this embodiment. Here, the hollow portion 430 penetrates the chamber body 400 along the radial direction of the screw 300. The cooling chamber includes a space between the chamber body 400 and the main body 10 and a space within the hollow portion 430. In this embodiment, the space between the chamber body 400 and the main body 10 is specifically the space between the outer wall of the exhaust end seat 200 and the inner wall of the chamber body 400. Of course, it is understandable that in other embodiments, other numbers of bottom connecting surfaces 410 and side connecting surfaces 420 may be provided, or the entire chamber body 400 may be an integral structure, or the chamber body 400 may not be plate-shaped. It only needs to be provided on the outside of the main body 10 so as to cooperate with the main body 10 and form a cooling chamber on the outside of the main body 10. The examples in this embodiment do not constitute an undue limitation to this application.

[0062] Furthermore, the cooling structure further includes a sealing plate 500, which is disposed on a side of the chamber body 400 away from the screw 300, i.e., radially outward of the sealing plate 500. Thus, the sealing plate 500 can be mounted on the chamber body 400 to close the side of the hollow portion 430 away from the screw 300. The sealing plate 500 is configured to fit onto the aforementioned bottom connecting surface 410 and side connecting surface 420 to close the outside of the hollow portion 430.

[0063] In some embodiments, the number of sealing plates 500 corresponds to the sum of the number of bottom connecting surfaces 410 and side connecting surfaces 420 in the chamber body 400. For example, in an embodiment having one bottom connecting surface 410 and two side connecting surfaces 420, three sealing plates 500 are provided. Referring to FIG8 , two sealing plates 500 are generally L-shaped, mirroring the shape of the L-shaped side connecting surfaces 420. The L-shaped sealing plates 500 are configured to fit on the outside of the side connecting surfaces 420 to close the outside of the hollow portion 430 in the side connecting surfaces 420. Referring again to FIG9 , another sealing plate 500 is configured to fit on the outside of the bottom connecting surface 410, i.e., the bottom of the bottom connecting surface 410, to close the outside of the hollow portion 430 in the bottom connecting surface 410.

[0064] It can be seen that, through the provision of the chamber body 400, a cooling chamber is formed outside the screw working chamber 260. The chamber body 400 of the cooling chamber is provided with spaced hollow portions 430. This ensures that the cooling medium can flow to the area within the hollow portions 430 while ensuring the overall structural strength of the cooling chamber. In addition, the hollow portions 430 are connected through the space radially inward of the chamber body 400, thereby allowing the cooling medium to flow between the hollow portions 430. Since the hollow portions 430 are spaced outside the screw working chamber 260, the cooling medium in different hollow portions 430 can cool different parts of the screw working chamber 260, thereby achieving a good cooling effect.

[0065] It is understood that in other embodiments, the configuration of the cooling structure is not limited to the above, and it is sufficient to form a cooling chamber for cooling the spiral segment. For example, the cooling chamber may only include the space within the hollow portion 430, and / or the hollow portion 430 may be provided with other components at the end near the main body 10 to connect the hollow portions 430 to form a connection between the hollow portions 430, etc. The examples in this embodiment do not constitute an undue limitation to this application.

[0066] From the above, it can be seen that in the embodiment of the present application, a cooling chamber is formed by setting a cooling structure, and the main body 10, especially the screw working chamber 260 of the exhaust end seat 200, is cooled by the cooling medium in the cooling chamber, which can effectively reduce the heat of the main body 10 and prevent the main body 10 from being deformed by heat and affecting the overall structure and working stability.

[0067] In an optional embodiment, on the basis of being provided with a cooling structure, the screw compressor also includes a coolant circulation pipeline, and an opening 510 is provided on the sealing plate 500. Please refer to Figure 8 here. An opening 510 is provided on each of the two sealing plates 500 corresponding to the two side connecting surfaces 420, so that the opening 510 on one sealing plate 500 is used as the first opening 510, and the opening 510 on the other sealing plate 500 is used as the second opening 510. The first opening 510 and the second opening 510 are connected to the hollow portion 430, that is, connected to the cooling chamber. The first opening 510 is used as an inlet and the second opening 510 is used as an outlet. The first opening 510 and the second opening 510 are configured in the coolant circulation pipeline through pipes, etc., so that the cooling chamber can be configured in the coolant circulation pipeline through the two openings 510. Of course, those skilled in the art will understand that the coolant circulation pipeline also includes a power source such as a pump configured therein, and may also be provided with structures such as valves. The examples in this embodiment do not constitute an improper limitation to its specific structure.

[0068] Furthermore, to achieve corresponding functions and technical effects, corresponding components and structures may be additionally provided on the inlet end seat 100. For example, in some embodiments, a sealed balancing chamber 230 may be further provided within the inlet end seat 100. The sealed balancing chamber 230 is connected to the aforementioned balancing gas port 130 and / or other low-pressure pipelines via external pipelines, such as to other low-pressure pipelines of the screw compressor or to low-pressure pipelines of other compressors, to reduce the pressure of the medium gas leaking into the sealed balancing chamber 230.

[0069] In some embodiments, in order to achieve a sealing effect, high-pressure end sealing gas inlets 240 can also be provided on both sides of the exhaust end seat 200, respectively, to be used to flush nitrogen or other gases into the exhaust end seat 200 as sealing gas, thereby preventing the medium gas leaking into the sealed balance cavity 230 from entering the second bearing cavity 220.

[0070] In some embodiments, to achieve lubrication, high-pressure lubricating oil inlets 250 may be provided on both sides of the exhaust end seat 200. The high-pressure lubricating oil inlets 250 are connected to the bearings within the exhaust end seat 200 for supplying oil to the bearings. Optionally, an oil return port may be provided below the exhaust end seat 200 for the lubricating oil to flow out, and the oil return port may be connected to the high-pressure lubricating oil inlet 250 via a pipeline to form a circulation loop and reuse the lubricating oil.

[0071] In some embodiments, in order to monitor the operating status of the bearing in real time, a high-pressure end bearing temperature measuring port 270 can also be set on the exhaust end seat 200. The high-pressure end bearing temperature measuring port 270 can extend the temperature measuring device into the bearing position in the exhaust end seat 200 to detect the temperature.

[0072] In some embodiments, referring to FIG6 , a second anchor is provided on the intake end seat 100, and a second anchor bolt hole 280 is provided on the second anchor. Typically, the second anchor bolt hole 280 is located at the bottom foot of the exhaust end seat 200. The second anchor bolt hole 280 vertically penetrates the second anchor and extends axially along the screw 300. In other words, the second anchor bolt hole 280 has a first length in the axial direction that is longer than the length of the anchor bolt. Thus, the second anchor bolt hole 280 can accommodate potential slippage of the exhaust end seat 200 due to thermal expansion and contraction. For example, the second anchor bolt hole 280 can be a large-clearance circular hole or an oblong hole. Here, in this embodiment, the first anchor bolt hole 180 and the second anchor bolt hole 280 are described as having the first length. However, in other embodiments, the first anchor bolt hole 180 and the second anchor bolt hole 280 may have different axial lengths, and the example in this embodiment does not constitute an undue limitation. Furthermore, in other embodiments, the above-mentioned configuration may be applied only to the second anchor bolt hole 280, or only to the first anchor bolt hole 180. In other words, only the first anchor bolt hole 180 and / or the second anchor bolt hole 280 need be provided on the main body 10 as anchor bolt holes.

[0073] In some embodiments, as shown in FIG10 , an exhaust end cap 290 may be provided. The exhaust end cap 290 is provided at an end of the exhaust end base 200 away from the intake end base 100. As shown in FIG11 , an axial hole 291 may be provided on the exhaust end cap 290 for the screw 300 to pass through and connect to an external drive mechanism.

[0074] Also, please continue to refer to Figure 11. The exhaust end cover 290 is provided with a connecting end surface 292 on the side away from the exhaust end seat 200. The connecting end surface 292 is used to connect to the drive mechanism. For example, here, the screw compressor also includes a coupling and a coupling protective cover 600, and the coupling is located inside the coupling protective cover 600. Please refer to Figure 12. The coupling protective cover 600 includes a first end 610 and a second end 620 opposite to each other. The first end 610 is close to the exhaust end cover 290. The first end 610 protrudes radially to form a first positioning step 611, and the first positioning step 611 is mounted on the connecting end surface 292. The second end 620 protrudes radially to form a second positioning step 621, and the second positioning step 621 is used to be mounted on the drive mechanism. The screw 300 is passed through the opening and connected to the coupling.

[0075] In some embodiments, as shown in Figure 11 , a support point 293 may be provided on the exhaust cover 290 to facilitate assembly, disassembly, and placement. Furthermore, a rotation mark indicating the screw 300 may be provided on the exhaust cover 290 for easy identification. An oil return port 294 may also be provided below the exhaust cover 290 to return lubricating oil from the high-pressure end.

[0076] As previously mentioned, the screw compressor also includes a screw 300. Refer to Figure 13. Here, the screw 300 includes a first screw 310 and a second screw 320. The ends of the first screw 310 and the second screw 320 are rotatably engaged with the aforementioned first bearing cavity 120 and second bearing cavity 220, respectively. Here, the first screw 310 has a male rotor, and the second screw 320 has a female rotor. The female and male rotors mesh with each other, and the area between the female and male rotors represents the location of the spiral segment. Of course, in other embodiments, the first screw 310 may have a female rotor and the second screw 320 may have a male rotor. This example in this embodiment does not constitute an undue limitation. The higher the efficiency of an oil-free screw compressor, the more controllable the outlet temperature. When the efficiency decreases, the outlet temperature rises significantly. However, if the rotor clearance is not properly set, rotor rubbing can easily occur. Therefore, the rotor profile generally adopts the design principle of low pressure ratio and high flow rate. In some embodiments of the present application, the gear ratio of the female rotor to the male rotor ranges from 3:4 to 3:5, and the single-stage pressure ratio of the screw compressor does not exceed 4. For example, the gear ratio of the female rotor to the male rotor can be set to 3:4, 3:5, 4:6, etc. As a result, the inlet and outlet temperature difference of the screw compressor can be controlled within 200°C.

[0077] Here, a synchronous gear 700 may also be provided. Refer to Figure 12 . Synchronous gear 700 includes a meshing pinion 720 and a large gear 710. The diameter of pinion 720 is smaller than that of large gear 710. Pinion 720 and large gear 710 are fixedly mounted on the male and female rotors, respectively, thereby ensuring that the male and female rotors rotate synchronously at a fixed speed ratio. Here, the male and female rotors, along with the screw working chamber 260, collectively form a compression chamber. Example

[0078] In one embodiment, the inlet end seat 100 and the exhaust end seat 200 are sequentially assembled and matched along the axial direction. The male rotor and the female rotor are both located within the screw working chamber 260 of the exhaust end seat 200. The ends of the first screw 310 having the male rotor and the second screw 320 having the female rotor extend into the first bearing chamber 120 of the inlet end seat 100 and the second bearing chamber 220 of the exhaust end seat 200, respectively. Bearings are provided in the first bearing chamber 120 and the second bearing chamber 220, respectively, to support the first screw 310 and the second screw 320. The air inlet 110 is connected to the screw working chamber 260. That is, the medium gas introduced through the air inlet 110 can be transported to the screw working chamber 260, compressed by the rotating male and female rotors, and then discharged from the exhaust port 210, thus completing the compression process of the medium gas.

[0079] A cooling structure is provided at the exhaust end seat 200. The cooling structure's chamber body 400 has hollow sections 430. The spaced hollow sections 430 ensure sufficient strength while separating the chamber body 400 into several interconnected, independent hollow sections 430. The cooling structure's two side connecting surfaces 420 and one bottom connecting surface 410 are attached to the two side surfaces and bottom surface of the exhaust end seat 200 to form a cooling chamber. During use, the cooling medium enters the cooling chamber through the first opening 510 on the side connecting surface 420, then passes through each hollow section 430, and finally exits the cooling chamber through the second opening 510 on the other side connecting surface 420. This ensures that the cooling medium can flow to all parts of the cooling chamber, increases the flow rate of the cooling medium within the cooling chamber, enhances the cooling effect at the exhaust end seat 200, and helps reduce deformation caused by temperature rise.

[0080] The intake cover 190 is fixedly connected to the intake end base 100, forming a sealed oil chamber with the intake end base 100. The intake cover 190 is provided with a synchronous gear oil inlet 191 to supply oil to the synchronous gear 700. The intake cover 190 is also provided with a balancing plate hole 192. The balancing plate hole 192 is coaxial with the male and female rotors, and a circular balancing plate can be installed to reduce the axial force of the male and female rotors. The tail cover 191 is used to be fixedly connected to the intake cover 190 and close the balancing plate hole 192.

[0081] The exhaust end cover 290 is fixedly connected to the exhaust end seat 200. The axial hole 291 on the exhaust end cover 290 is coaxial with the first screw 310. The end of the first screw 310 extends out of the axial hole 291 and is connected to a drive mechanism (such as a motor). The center of the connecting end face 292 is coaxial with the axial hole 291 and the first screw 310. The connecting end face 292 and the end face of the connecting end of the drive mechanism are fixedly connected via a hollow cylindrical coupling shield 600. The ends of the coupling shield 600 are respectively fixed to the connecting end face 292 on the exhaust end cover 290 and the end face at the connecting position on the drive mechanism by bolts. Here, the first positioning steps 611 and the second positioning steps 621 at the ends of the coupling shield 600 respectively cover the connecting end face 292 and the end face at the connecting position on the drive mechanism, ensuring the concentricity requirements of the first screw 310 and the drive shaft of the drive mechanism. At the same time, the coupling shield 600 can also provide protection for the coupling therein. An oil return port 294 may also be provided on the exhaust end cover 290 for returning oil to the second bearing cavity 220 on the exhaust end seat 200 .

[0082] At the same time, the air inlet end seat 100 and the exhaust end seat 200 are also respectively provided with a first anchor bolt hole 180 and a second anchor bolt hole 280, which are in the shape of a large clearance circular hole or an oblong hole, so as to adapt to the slippage of the machine during thermal expansion and contraction.

[0083] It can be understood that the meanings of the terms in the embodiments of the present application are the same. For the content that is not described in detail in a certain embodiment, the specific implementation details can refer to the descriptions in other embodiments. The example descriptions and technical effects shown in the aforementioned embodiments can all be implemented accordingly. For the repeated parts, this embodiment will not go into details.

[0084] Accordingly, to better achieve the technical effects of the embodiments of the present application, the embodiments of the present application further provide an apparatus comprising the aforementioned screw compressor and a drive mechanism connected to the screw 300 of the screw compressor. The apparatus may be a ship, a vehicle, a self-propelled device, a refrigeration device, a heating device, or the like, and the examples in this embodiment do not constitute an undue limitation thereto.

[0085] Accordingly, in order to better achieve the technical effects of the embodiments of the present application, the embodiments of the present application also provide a method for using a screw compressor. During use, a cooling medium can be introduced into the cooling chamber and allowed to flow between the hollow portions 430 of the cooling chamber to cool the main body 10 of the screw compressor. Of course, the steps included in this method are not limited to cooling. The specific details of the cooling steps and other use steps of the screw compressor can be found in the corresponding descriptions of the aforementioned structural embodiments, and will not be further described in the embodiments of the present application.

[0086] The screw compressor, the equipment having the same, and the method of use provided by the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A screw compressor, wherein: include, A main body having a screw working chamber; A screw having a spiral section, wherein the spiral section is located in a working chamber of the screw; as well as A cooling structure is arranged on the outside of the main body, a cooling chamber is formed between the main body and the cooling structure, the cooling chamber is configured to allow a cooling medium to pass through, and the projection of the cooling chamber in the radial direction of the screw covers at least a portion of the spiral segment.

2. The screw compressor according to claim 1, wherein: The cooling structure comprises a chamber body and a sealing plate; The chamber body is arranged outside the main body, and a plurality of hollow parts arranged at intervals are arranged on the chamber body, and the hollow parts penetrate the chamber body along the radial direction of the screw, and the cooling chamber includes a space between the chamber body and the main body and a space in the hollow parts; The sealing plate is located at a side of the chamber body away from the screw rod, and the sealing plate is installed on the chamber body to close a side of the hollow portion away from the screw rod.

3. The screw compressor according to claim 2, wherein: The chamber body comprises a bottom connecting surface and a side connecting surface, wherein the bottom connecting surface is located at the bottom of the body, and the side connecting surface is located at the side surface of the body in the radial direction, and the hollow portion is provided on both the bottom connecting surface and the side connecting surface.

4. The screw compressor according to claim 2, wherein: The screw compressor is also provided with a coolant circulation pipeline, the sealing plate is provided with a first opening and a second opening, the first opening and the second opening are connected to the cooling chamber, and the cooling chamber is arranged in the coolant circulation pipeline through the first opening and the second opening.

5. The screw compressor according to claim 1, wherein: The main body is provided with a foot, and the foot is provided with an anchor bolt hole, the anchor bolt hole vertically penetrates the foot, and the anchor bolt hole extends along the axial direction of the screw rod to have a first length in the axial direction.

6. The screw compressor according to claim 1, wherein: The main body includes an air inlet end seat and an air outlet end seat connected in sequence along the axial direction of the screw, and the screw includes a first screw and a second screw. The air inlet end seat has a first bearing cavity; The exhaust end seat has a second bearing cavity, and the screw working cavity is located in the exhaust end seat; One of the first screw and the second screw has a female rotor, and the other has a male rotor. The female rotor and the male rotor are meshed with each other, and the place where the female rotor and the male rotor meet is the spiral section. Two ends of the second screw are rotatably fitted in the first bearing cavity and the second bearing cavity.

7. The screw compressor according to claim 6, wherein: The gear ratio of the female rotor to the male rotor ranges from 3:4 to 3:5, and the single-stage pressure ratio of the screw compressor does not exceed 4.

8. The screw compressor according to claim 6, wherein: The air inlet end seat is provided with a first anchor bolt hole, the first anchor bolt hole vertically penetrates the air inlet end seat, and the first anchor bolt hole extends along the axial direction of the screw rod.

9. The screw compressor according to claim 6 or 8, wherein: The exhaust end seat is provided with a second anchor bolt hole, the second anchor bolt hole vertically penetrates the exhaust end seat, and the second anchor bolt hole extends along the axial direction of the screw rod.

10. The screw compressor according to claim 6, wherein: The air inlet end seat is provided with a first connecting flange, the first connecting flange has an inlet, and the inlet faces the radial direction of the screw; The exhaust end seat is provided with a second connecting flange, the second connecting flange has an outlet, and the outlet faces the radial direction of the screw.

11. The screw compressor according to claim 6, wherein: It also includes an exhaust end cover, which is arranged at an end of the exhaust end seat away from the intake end seat. The exhaust end cover is provided with a connecting end surface on a side away from the exhaust end seat, and the connecting end surface is configured to connect to a driving mechanism.

12. The screw compressor according to claim 11, wherein: The screw compressor further comprises a coupling and a coupling protection cover, wherein the coupling is located in the coupling protection cover, the coupling protection cover comprises a first end and a second end opposite to each other, an opening is further provided on the connecting end surface, the screw is passed through the opening and connected to the coupling, A first positioning step is provided at the first end, and the first positioning step is sleeved on the connecting end surface.

13. The screw compressor according to claim 11, wherein: The screw compressor further comprises a coupling and a coupling protection cover, wherein the coupling is located in the coupling protection cover, the coupling protection cover comprises a first end and a second end opposite to each other, an opening is further provided on the connecting end surface, the screw is passed through the opening and connected to the coupling, A second positioning step is provided at the second end, and the second positioning step is configured to be sleeved on the driving mechanism.

14. A device, wherein: It comprises a screw compressor as claimed in any one of claims 1 to 13 and a driving mechanism connected to a screw of the screw compressor.

15. A method for using a screw compressor according to any one of claims 1 to 13, wherein: A cooling medium is introduced into the cooling chamber and allowed to flow between the hollow portions of the cooling chamber to cool the main body of the screw compressor.

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