Single-screw compressor meshing pair lubricating structure and lubricating method

Abstract

The application discloses a kind of single screw compressor meshing pair lubricating structure and lubricating method, lubricating structure includes being arranged in several liquid supply holes of compression cavity inner wall, liquid supply hole is located the surface above screw and star wheel 0, and the position and quantity of liquid supply hole correspond with the meshing area of each part of single screw compressor, the angle of each liquid supply hole can make that liquid covers all tooth top and tooth side gap of meshing pair maximum degree under specific liquid injection speed;Liquid supply hole is connected with liquid supply pipeline of introducing lubricating liquid.Lubricating method includes when compressor is operated, simultaneously into lubricating liquid by liquid supply hole, makes lubricating liquid from liquid supply pipeline into the meshing area of each part of single screw compressor in compression cavity, carries out real-time lubrication to the meshing area of each part of single screw compressor.The application can more accurately lubricate the meshing position of single screw compressor meshing pair, more conducive to the uniform distribution of lubricating liquid in meshing pair, prolongs the service life of meshing pair.

Description

A lubrication structure and lubrication method for meshing pairs in a single-screw compressor Technical Field

[0001] This invention belongs to the field of compressor structural design and relates to a lubrication structure and lubrication method for the meshing pair of a single screw compressor. Background Technology

[0002] A single-screw compressor is a positive displacement rotary compressor. While possessing the advantages of twin-screw compressors, such as simple and compact structure, high volume utilization, and no valve assembly, it also has excellent force balance due to the symmetrical working mode of the two star wheels. It also features large single-unit capacity, zero clearance volume, and long main unit life. It is one of the key mechanical components in many manufacturing, service and even military industries, and is widely used in petroleum, chemical, energy, pharmaceutical, food and other fields.

[0003] The superior performance of single-screw compressors has gained increasing market favor in recent years, and the development and maturation of their various technologies will undoubtedly bring considerable economic benefits to the industry. Currently, one of the main problems with single-screw compressors lies in the wear of the meshing pairs, especially the star wheel. Aside from profile factors, this wear primarily stems from insufficient lubrication. Therefore, it is necessary to find an effective lubrication structure for the meshing pairs of single-screw compressors to achieve adequate lubrication. Summary of the Invention

[0004] The purpose of this invention is to address the problems in the prior art by providing a lubrication structure and method for the meshing pairs of a single screw compressor, which can achieve sufficient lubrication for the meshing pairs of the single screw compressor and extend the service life of the meshing pairs.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A lubrication structure for the meshing pair of a single-screw compressor includes:

[0007] Several liquid supply holes are provided on the inner wall of the compression chamber. The liquid supply holes are located above the zero surface of the screw and the star wheel. The position and number of the liquid supply holes correspond to the meshing areas of each part of the single screw compressor. The angle of each liquid supply hole can ensure that the liquid covers all tooth tips and tooth flanks of the meshing pair to the maximum extent at a specific injection speed, so that the meshing pair achieves the best lubrication supply state. The liquid supply holes are connected to the liquid supply pipe that introduces the lubricating liquid.

[0008] As a preferred embodiment, the meshing regions of the single screw compressor include an entering meshing region, a meshing region, and a disengaging meshing region.

[0009] As a preferred embodiment, the liquid supply holes are evenly distributed along the axial direction corresponding to the areas formed by all the star wheel tooth screw grooves that are participating in the meshing.

[0010] As a preferred embodiment, at a specific injection speed, the angle of each injection hole ensures that the lubricant is sprayed through the injection hole to the point where, in a plane with the screw axis as the normal, the lubricant is sprayed towards the gap between the meshing teeth, and in a plane with the star wheel axis as the normal, towards at least the height of the star wheel teeth. The number of supply holes determines the position to which the lubricant is sprayed through the supply holes. In a plane with the star wheel axis as the normal, all star wheel plates in the meshing state are fully covered. Combined with the centrifugal effect of the rotation of the meshing pair on the lubricant, based on the angle and number of supply holes, the lubricant can cover all tooth tips and tooth flanks of the meshing pair to the greatest extent, thereby achieving the best lubrication supply state for the meshing pair.

[0011] As a preferred embodiment, in a plane with the screw axis as the normal, if the spray velocity of the liquid supply hole is v, the angle between the direction of the liquid supply hole and the surface of the star wheel is θ, the distance between the liquid supply hole and the surface of the star wheel is h, and the projection distance between the liquid supply hole and the tooth tip of the star wheel on the surface of the star wheel is L;

[0012] Therefore, when the direction of the liquid supply hole relative to the star wheel surface is the same as the direction of gravity, then:

[0013]

[0014] After removing unreasonable roots, we can deduce that θ satisfies the following relationship:

[0015]

[0016] When the direction of the liquid supply hole relative to the star wheel surface is opposite to the direction of gravity, then:

[0017]

[0018] After removing unreasonable roots, we can deduce that θ satisfies the following relationship:

[0019]

[0020] As a preferred embodiment, in a plane with the star wheel axis as the normal, if the number of teeth on the star wheel is n, the number of liquid supply holes is m, and the star wheel tooth height is... The distance from the center of the star wheel is 'a', and the liquid supply hole is at the same height as the star wheel tooth. The projected distance on the surface of the star wheel plate is b:

[0021] The angle between the center lines of adjacent teeth of the star wheel is The tooth height corresponding to the center line of adjacent teeth of the star wheel plate The arc length at that point is The arc length corresponds to the angle at the liquid supply hole. Therefore, the number of liquid supply holes satisfies:

[0022]

[0023] If the direction of the line connecting each liquid supply hole to the center of the star wheel is defined as the central angle direction of that liquid supply hole, and the angle between the liquid supply hole and its central angle direction is γ in the plane with the star wheel axis as the normal, then the center lines of adjacent teeth of the star wheel plate are at the tooth height. The arc length corresponds to the angle at the liquid supply hole. This angle is bisected by the direction of the center angle of the supply orifice, therefore γ satisfies:

[0024]

[0025] As a preferred embodiment, the liquid supply hole extends from the inner wall of the compression chamber to the outer wall of the compression chamber to form a liquid supply channel. A liquid supply pipe is introduced into the housing and connected to the liquid supply channel to form an internal lubrication structure.

[0026] As a preferred embodiment, the liquid supply hole is a countersunk hole machined on the inner wall of the compression chamber, and the countersunk holes are connected by connecting holes opened along the axial direction in the inner wall of the compression chamber to lead to the outside of the machine housing, forming a liquid supply channel. A liquid supply pipe is introduced outside the machine housing and connected to the liquid supply channel to form an external lubrication structure.

[0027] A lubrication method for the meshing pair lubrication structure of the single-screw compressor, comprising:

[0028] During compressor operation, lubricating fluid is simultaneously introduced through the fluid supply port, allowing the lubricating fluid to enter the meshing areas of the single screw compressor within the compression chamber from the fluid supply pipe, providing real-time lubrication to the meshing areas of the single screw compressor.

[0029] As a preferred solution, the lubricant is pre-pressurized so that the injection pressure in the supply pipeline is greater than the pressure inside the compression chamber of the single screw compressor, and the lubricant is simultaneously introduced through the supply port during the continuous injection process.

[0030] Compared with the prior art, the present invention has at least the following beneficial effects:

[0031] By providing several liquid supply holes on the inner wall of the compression chamber, with the position and number of these holes corresponding to the different meshing areas of the single-screw compressor, and one or more supply holes provided for each meshing area, sufficient lubrication of all meshing areas of the single-screw compressor can be achieved. The angle of each supply hole is set so that the lubricating fluid can cover all tooth tips and tooth flanks of the meshing pair to the maximum extent. This ensures that the meshing pair achieves optimal lubrication when all meshing gaps are maximally lubricated. Therefore, the lubrication structure according to this invention allows the lubricating fluid to more precisely lubricate the meshing positions of the single-screw compressor meshing pairs, promotes more uniform distribution of the lubricating fluid within the meshing pairs, extends the service life of the meshing pairs, and is suitable for most compression media, lubrication media, and operating conditions.

[0032] Furthermore, depending on the different connection methods between the liquid supply hole and the liquid supply pipe, an internal lubrication structure or an external lubrication structure can be formed. The internal lubrication structure is suitable for the liquid supply method around the star wheel shaft system of a single screw compressor, while the external lubrication structure is suitable for the liquid supply method around the screw shaft system of a single screw compressor. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in this application, the drawings used in the application description will be briefly introduced below. The drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 is a schematic diagram of the meshing pair of the single screw compressor according to an embodiment of the present invention.

[0035] Figure 2 is a schematic diagram of the in-plane liquid supply hole feature calculation in an embodiment of the present invention with the screw axis direction as the normal.

[0036] Figure 3 is a schematic diagram of the in-plane liquid supply hole feature calculation in an embodiment of the present invention with the star wheel axis direction as the normal.

[0037] Figure 4 is a schematic diagram of the internal lubrication structure of the meshing pair of the single screw compressor according to an embodiment of the present invention.

[0038] Figure 5 is a schematic diagram of the external lubrication structure of the meshing pair of the single screw compressor according to an embodiment of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0040] Please refer to Figures 1, 4, and 5. The lubrication structure for the meshing pair of the single-screw compressor proposed in this embodiment includes several liquid supply holes disposed on the inner wall 3 of the compression chamber. The liquid supply holes are located above the 0-surface of the screw 1 and the star wheel 2. The 0-surface refers to the surface of the star wheel 2 away from the star wheel support, that is, the upper surface of the star wheel 2. This surface passes through the axis of the screw 1 after meshing and has a positioning function. The position and number of liquid supply holes correspond to the meshing areas of the single-screw compressor. The angle of each liquid supply hole allows the liquid to cover all tooth tips and tooth flanks of the meshing pair to the maximum extent at a specific injection speed, thereby achieving the optimal lubrication supply state for the meshing pair. The liquid supply holes are connected to a liquid supply pipe for introducing lubricating liquid.

[0041] The single-screw compressor has several meshing areas, including the area entering meshing, the area currently meshing, and the area disengaging. One or more fluid supply holes are provided in the corresponding meshing areas. By reasonably distributing the number of holes on the inner wall of the compression chamber, lubricating fluid can be accurately supplied to all star gear teeth and screw tooth grooves that are in meshing, including the positions of entering meshing, meshing, and disengaging. The fluid supply holes are evenly distributed along the axial direction to correspond to the areas formed by all star gear teeth and screw grooves participating in meshing, so as to achieve sufficient lubrication of the meshing parts.

[0042] In one possible implementation, at a specific injection speed, the angle of each injection hole ensures that the lubricant is sprayed to the position of the meshing pair tooth tip clearance in a plane with the screw axis as the normal, and to at least 2 / 3 of the star wheel tooth height in a plane with the star wheel axis as the normal. The number of injection holes ensures that the lubricant is sprayed to the position of all meshing star wheels in a plane with the star wheel axis as the normal. Combined with the centrifugal effect of the meshing pair rotation on the lubricant, the angle and number of injection holes can maximize the coverage of all tooth tips and tooth flank clearances of the meshing pair, thereby achieving the optimal lubrication supply state for the meshing pair.

[0043] Please refer to Figure 2. The fluid supply hole is required to ensure sufficient lubrication in all areas under engagement conditions simultaneously. In the plane with the screw axis as the normal, the fluid supply hole in this embodiment of the invention has the following characteristics:

[0044] If the liquid injection velocity of the liquid supply hole is v, the angle between the direction of the liquid supply hole and the surface of the star wheel is θ, the distance between the liquid supply hole and the surface of the star wheel is h, and the projection distance between the liquid supply hole and the tooth tip of the star wheel on the surface of the star wheel is L;

[0045] Then, when the direction of the hole relative to the surface of the star wheel is the same as the direction of gravity, then:

[0046]

[0047] After removing unreasonable roots, we can deduce that θ satisfies the following relationship:

[0048]

[0049] When the direction of the hole relative to the surface of the star wheel is opposite to the direction of gravity, then:

[0050]

[0051] After removing unreasonable roots, we can deduce that θ satisfies the following relationship:

[0052]

[0053] Please refer to Figure 3. In the plane with the star wheel axis direction as the normal, the liquid supply hole has the following characteristics:

[0054] If the number of teeth on the star wheel is n and the number of liquid supply holes is m, the height of the star wheel teeth is... The distance from the center of the star wheel is 'a', and the liquid supply hole is at the same height as the star wheel tooth. The projected distance on the surface of the star wheel plate is b:

[0055] The angle between the center lines of adjacent teeth of the star wheel is The tooth height corresponding to the center line of adjacent teeth of the star wheel plate The arc length at that point is The arc length corresponds to the angle at the liquid supply hole. Therefore, the number of liquid supply holes satisfies:

[0056]

[0057] If the direction of the line connecting each liquid supply hole to the center of the star wheel is defined as the central angle direction of that liquid supply hole, and the angle between the liquid supply hole and its central angle direction is γ in the plane with the star wheel axis as the normal, then the center lines of adjacent teeth of the star wheel plate are at the tooth height. The arc length corresponds to the angle at the liquid supply hole. This angle is bisected by the direction of the center angle of the supply orifice, therefore γ satisfies:

[0058]

[0059] The lubrication structure of the single-screw compressor meshing pair in this invention can be configured as an internal lubrication structure or an external lubrication structure, depending on the different connection methods between the liquid supply hole and the liquid supply pipe.

[0060] In one possible implementation, the liquid supply hole extends from the inner wall of the compression chamber to the outer wall of the compression chamber to form a liquid supply channel. A liquid supply pipe is introduced into the housing and connected to the liquid supply channel to form an internal lubrication structure.

[0061] In one possible implementation, the liquid supply hole is a countersunk hole machined on the inner wall of the compression chamber, and the countersunk holes are connected by connecting holes opened axially in the inner wall of the compression chamber to lead to the outside of the housing, forming a liquid supply channel. A liquid supply pipe is introduced outside the housing and connected to the liquid supply channel to form an external lubrication structure.

[0062] Internal lubrication structures are more suitable for fluid supply methods around the star wheel shaft system of a single-screw compressor, while external lubrication structures are more suitable for fluid supply methods around the screw shaft system of a single-screw compressor. The single-screw compressor meshing pair lubrication structure of this embodiment offers flexible configuration options to meet the application needs of various situations.

[0063] Referring to Figure 4, in one possible implementation, the fluid supply port includes three through holes evenly distributed axially in the meshing area. These through holes are located on the inner sidewall of the compression chamber above the screw shaft and the star wheel's O-surface. The three through holes serve as fluid supply channels, connected to the fluid supply pipe within the housing via threaded connections or other means. During compressor operation, a suitable flow rate of lubricating fluid is simultaneously introduced, entering the fluid supply channels from the fluid supply pipe and then into the meshing area, providing more precise and uniform real-time lubrication for the meshing pair.

[0064] Referring to Figure 5, in one possible implementation, the fluid supply port includes three countersunk holes evenly distributed axially in the meshing area and one through-hole distributed axially on the suction side. The countersunk holes are located on the inner sidewall of the compression chamber above the screw shaft and the star wheel 0 surface, reaching the depth of the through-hole. The through-hole is located inside the sidewall where the countersunk holes are located, connecting the three countersunk holes and the outside of the housing. The through-hole and the three countersunk holes serve as fluid supply channels. The through-hole is connected to the fluid supply pipe outside the housing by means of threaded connection or other means. When the compressor is running, an appropriate flow rate of lubricating fluid is simultaneously introduced, entering the fluid supply channel from the fluid supply pipe, and then entering the meshing area, providing more precise and uniform real-time lubrication for the meshing pair.

[0065] Furthermore, the number and distribution of holes on the inner sidewall of the compression chamber above the screw shaft and star wheel 0 surface are, but are not limited to, those described in the embodiments. The connection methods in the liquid supply channel and liquid supply pipe include, but are not limited to, threaded connections, and may vary depending on the actual compression medium, lubricating fluid medium, and operating conditions.

[0066] Embodiments of the present invention also propose a lubrication method based on the lubrication structure of the meshing pair of the single screw compressor, comprising:

[0067] During compressor operation, lubricating fluid is simultaneously introduced through the fluid supply port, allowing the lubricating fluid to enter the meshing areas of the single screw compressor within the compression chamber from the fluid supply pipe, providing real-time lubrication to the meshing areas of the single screw compressor.

[0068] Furthermore, in the lubrication method of this embodiment of the invention, the lubricating fluid is pre-pressurized so that the injection pressure in the supply pipeline is greater than the pressure inside the compression chamber of the single screw compressor, and the lubricating fluid is simultaneously introduced through the supply hole during the continuous injection process.

[0069] This invention can more accurately lubricate the meshing position of the single screw compressor meshing pair, which is more conducive to the uniform distribution of lubricant in the meshing pair, extends the service life of the meshing pair, and is applicable to most compression media, lubrication media and operating conditions.

[0070] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A lubrication structure for the meshing pair of a single-screw compressor, characterized in that, The compressor includes several liquid supply holes set on the inner wall (3) of the compression chamber. The liquid supply holes are located above the 0 surface of the screw (1) and the star wheel (2). The 0 surface refers to the surface of the star wheel (2) away from the star wheel support, that is, the upper surface of the star wheel (2). The position and number of the liquid supply holes correspond to the meshing areas of each part of the single screw compressor. The angle of each liquid supply hole can make the liquid cover all the tooth tips and tooth flanks of the meshing pair to the maximum extent at a specific injection speed. The liquid supply holes are connected to the liquid supply pipe for introducing lubricating liquid. At a specific injection speed, the angle of each liquid supply hole can make the lubricating liquid sprayed through the liquid supply hole sprayed towards the tooth tip gap of the meshing pair in a plane with the screw axis as the normal, and towards at least the tooth height of the star wheel in a plane with the star wheel axis as the normal. The number of supply holes determines the position to which the lubricant is sprayed through the supply holes. In a plane with the star wheel axis as the normal, all star wheel plates in the meshing state are fully covered. Combined with the centrifugal effect of the rotation of the meshing pair on the lubricant, the angle and number of supply holes are set to maximize the coverage of all tooth tips and tooth flanks of the meshing pair.

2. The lubrication structure for the meshing pair of the single-screw compressor according to claim 1, characterized in that, The meshing regions of the single screw compressor include the region entering the meshing region, the region currently meshing, and the region disengaging from the meshing region.

3. The lubrication structure for the meshing pair of the single-screw compressor according to claim 2, characterized in that, The liquid supply holes are evenly distributed along the axial direction, corresponding to the areas formed by all the star wheel tooth screw grooves that are participating in the meshing.

4. The lubrication structure for the meshing pair of the single-screw compressor according to claim 1, characterized in that, In a plane with the screw axis as the normal, if the injection velocity of the liquid supply orifice is v, and the angle between the direction of the liquid supply orifice and the surface of the star wheel is θ... Let h be the distance between the liquid supply hole and the surface of the star wheel, and L be the projection distance between the liquid supply hole and the tooth tip of the star wheel on the surface of the star wheel. Then, when the direction of the liquid supply hole relative to the star wheel surface is the same as the direction of gravity, the following conditions are met: When the direction of the liquid supply hole relative to the star wheel surface is opposite to the direction of gravity, the following condition is satisfied: 。 5. The lubrication structure for the meshing pair of the single-screw compressor according to claim 1, characterized in that, In a plane with the star wheel axis as the normal, if the number of teeth on the star wheel is n, the number of liquid supply holes is m, and the height of the star wheel teeth is... The distance from the center of the star wheel is 'a', and the liquid supply hole is at the same height as the star wheel tooth. If the projected distance on the surface of the star wheel is b, then the number of liquid supply holes m satisfies: If the direction of the line connecting each liquid supply hole to the center of the star wheel is defined as the central angle direction of that liquid supply hole, then in the plane with the star wheel axis as the normal, the angle between the liquid supply hole and its central angle direction is... ,but satisfy: 。 6. The lubrication structure for the meshing pair of the single-screw compressor according to claim 1, characterized in that, The liquid supply hole extends from the inner wall (3) of the compression chamber to the outer wall of the compression chamber to form a liquid supply channel. A liquid supply pipe is introduced into the housing and connected to the liquid supply channel to form an internal lubrication structure.

7. The lubrication structure for the meshing pair of the single-screw compressor according to claim 1, characterized in that, The liquid supply hole is a countersunk hole machined on the inner wall (3) of the compression chamber. The countersunk holes are connected by connecting holes opened along the axial direction in the inner wall (3) of the compression chamber, leading to the outside of the machine housing to form a liquid supply channel. A liquid supply pipe is introduced outside the machine housing and connected to the liquid supply channel to form an external lubrication structure.

8. A lubrication method based on the lubrication structure of the meshing pair of a single-screw compressor according to any one of claims 1-7, characterized in that, This includes: when the compressor is running, lubricating fluid is simultaneously introduced through the supply port, so that the lubricating fluid enters from the supply pipe into the meshing areas of the single screw compressor in the compression chamber, and provides real-time lubrication to the meshing areas of the single screw compressor.

9. The lubrication method according to claim 8, characterized in that: The lubricant is pre-pressurized so that the injection pressure in the supply pipeline is greater than the pressure inside the compression chamber of the single screw compressor. During the continuous injection process, lubricant is simultaneously introduced through the supply port.

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