CN218882523U - Oil injection structure, screw compressor and refrigeration equipment - Google Patents

Abstract

The utility model provides an oil spout structure, screw compressor and refrigeration plant relates to compressor technical field, and the oil spout structure of having solved conventional screw compressor fails to carry out abundant injection to key rotor meshing position, leads to the technical problem that the fluid in the intertooth space volume takes place to leak easily. The utility model provides an oil spout structure is including the nozzle opening of locating screw compressor shell inner wall, and the nozzle opening is located the crossing line in positive side chamber and negative side chamber. The oil injection port is arranged on the intersecting line of the male side cavity and the female side cavity, and the meshing part of the male rotor and the female rotor is just opposite to the intersecting line of the male side cavity and the female side cavity, so that the injected oil bodies can be distributed at the meshing position of the male rotor and the female rotor, and an oil film is formed at the mutual contact position of the male rotor and the female rotor, thereby effectively avoiding the leakage of fluid in the inter-tooth volume from the inter-rotor contact line and the leakage triangle, further obviously improving the volumetric efficiency of the compressor, and having great popularization value and wide application prospect.

Description

Oil injection structure, screw compressor and refrigeration equipment

Technical Field

The utility model belongs to the technical field of the compressor technique and specifically relates to an oil spout structure, helical-lobe compressor and refrigeration plant are related to.

Background

A screw compressor is a fluid machine capable of converting a low-pressure fluid into a high-pressure fluid, and is one of core devices of a refrigeration system. The screw compressor is composed of a pair of parallel and intermeshing female and male screws, which is one of the most widely used rotary compressors, and is divided into a single screw and a twin screw, and the screw compressor is generally referred to as a twin screw compressor. The screw compressor can be a dry type screw compressor or a wet type screw compressor, the dry type screw compressor is a working cavity in which liquid is not sprayed, compressed gas is not polluted, but the maintenance is difficult, the noise is large, and the manufacturing cost is high; the wet screw compressor is one with lubricating oil or other liquid sprayed into the working cavity to cool the compressed gas, and has improved sealing and increased lubrication.

In order to improve energy efficiency, reduce noise and prolong service life, the wet screw compressor widely used at present is generally provided with an oil injection structure, but the oil injection structure is generally arranged on the side face of a machine body, and an oil injection port is generally arranged along the radial direction of a male rotor cavity or a female rotor cavity. (as shown in the attached figure 1 of the specification, the oil injection structure 9 is positioned on the side surface of the machine body, and the nozzles are arranged along the radial direction of the male rotor). The applicant finds that the prior art has at least the following technical problems: the oil injection structure of the conventional screw compressor is arranged on the side face, the oil injection port faces to a gap between a rotor tooth top and a rotor cavity, and the oil injection direction of the oil injection port is far away from the meshing position of a male rotor and a female rotor, so that the gap between the rotor tooth top and the rotor cavity is mainly sealed, the key rotor meshing position cannot be sufficiently injected with sealing oil, the leakage of fluid in an inter-tooth volume is easy to occur through a contact line between the rotors and a leakage triangle, and the volumetric efficiency of the compressor is seriously reduced.

Disclosure of Invention

An object of the utility model is to provide an oil spout structure, helical-lobe compressor and refrigeration plant to the oil spout structure who solves among the prior art conventional helical-lobe compressor fails to carry out abundant injection to key rotor meshing position, leads to the fluid in the intertooth space volume to be easy to take place to leak through the inter-rotor contact line and leakage triangle-shaped department, has seriously drawn down compressor volumetric efficiency's technical problem _。 The utility model provides a plurality of technical effects that preferred technical scheme among a great deal of technical scheme can produce see the explanation below in detail.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

in a first aspect, an embodiment of the present invention provides an oil injection structure, configured in screw compressor, including the oil spout, the oil spout is located the inner wall of screw compressor housing, just the oil spout is seted up on the intersection line of positive side chamber and negative side chamber in screw compressor.

Further, the oil injection port is positioned at the intersection of the intersection line of the positive side cavity and the negative side cavity and the oil injection reference line in the screw compressor.

Furthermore, the oil injection reference line is a contact line between a tooth top line adjacent to the air suction closed line of the screw compressor and located on one side of the air suction closed line far away from the air inlet end and the inner wall of the screw compressor.

The oil delivery pipe is communicated to the outer wall of the shell of the screw compressor from the oil injection port; the oil delivery pipe forms a passage facing the meshing position of the male rotor and the female rotor in the screw compressor.

The oil inlet is formed by the oil pipeline on the outer wall of the shell of the screw compressor; the oil delivery pipe is a straight passage between the oil injection port and the oil inlet.

Furthermore, the oil inlet is provided with a connecting piece which is connected with an oil supply pipe of an oil supply facility, and at least part of the connecting piece is formed by the outer wall of the shell of the screw compressor.

In a second aspect, an embodiment of the present invention provides a screw compressor, which includes a casing, the inner wall of the casing is provided with the aforementioned oil injection structure.

Further, the housing inner wall defines at least a male side cavity for configuring the male rotor and a female side cavity for configuring the female rotor.

Further, a male rotor and a female rotor are disposed in the housing in a side-by-side relationship and are meshed with each other.

In a third aspect, an embodiment of the present invention provides a refrigeration apparatus, including the foregoing screw compressor.

Based on above-mentioned technical scheme, the utility model provides an oil spout structure, helical-lobe compressor, refrigeration plant have following outstanding substantive characteristics and the progress that is showing at least:

an embodiment of the utility model provides an oil spout structure disposes in screw compressor, including the nozzle, the nozzle is located the inner wall of screw compressor casing, and the nozzle is seted up in screw compressor on the crossing line in positive side chamber and negative side chamber. The oil injection port of the oil injection structure is arranged on the intersecting line of the male side cavity and the female side cavity in the screw compressor, so that oil bodies injected from the oil injection port can be simultaneously dispersed in the male side cavity and the female side cavity, and the meshing position of the male rotor and the female rotor just faces the intersecting line of the male side cavity and the female side cavity, so that the oil bodies injected from the oil injection port can be distributed at the meshing position of the male rotor and the female rotor, an oil film is formed at the mutual contact position of the male rotor and the female rotor, lubrication is facilitated, friction is reduced, leakage of fluid in inter-tooth volume from a contact line between the rotors and a leakage triangle is greatly reduced and even avoided, and the volumetric efficiency of the compressor is remarkably improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of a conventional screw compressor;

fig. 2 is a schematic cross-sectional view of the screw compressor of the present invention, which is perpendicular to the axial direction of the screw;

fig. 3 is a schematic view of the cross-sectional structure of the screw compressor according to the present invention.

The attached drawings indicate the following:

1. a housing; 11. the ventral cavity; 12. a cathodic compartment;

2. a male rotor;

3. a female rotor;

4. an oil injection structure; 41. an oil delivery pipe; 42. an oil injection port; 43. an oil inlet; 431. a connecting member;

5. an air inlet groove; 51. a suction closing line;

6. air intake rear teeth; 61. an oil injection reference line;

9. and (4) oil injection structure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and implementation examples. It is to be understood that the disclosed embodiments are merely exemplary of the invention, and are not intended to limit the invention to the precise embodiments disclosed. Furthermore, the specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting of the invention. In addition, based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in the present invention can be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to the description attached fig. 2 and fig. 3, in a first aspect, an embodiment of the present invention provides an oil injection structure configured in a screw compressor, including an oil injection port 42, the oil injection port 42 is located on an inner wall of a casing 1 of the screw compressor, and the oil injection port 42 is opened on an intersection line of a male side cavity 11 and a female side cavity 12 in the screw compressor.

It can be understood that the tooth space volume of the screw compressor generally comprises four types of leakage channels, namely a contact line between rotors, a leakage triangle, an exhaust end face, a gap between a tooth top and the inner wall of a cylinder; the contact line between the rotors and the leakage triangle are two leakage channels with the largest leakage amount, especially the leakage triangle (the vertex of the rotor meshing line can not reach the cylinder body intersecting line generally, and a space curved triangle is formed between the vertex of the meshing line, the contact point of the male rotor and the cylinder body intersecting line and the contact point of the female rotor and the cylinder body intersecting line, namely the leakage triangle), which has great influence on the volume efficiency. While the wet screw compressor widely used at present is provided with an oil injection structure, the oil injection structure is usually arranged on the side of the machine body, and an oil injection port is usually arranged along the radial direction of the male rotor cavity or the female rotor cavity. (as shown in the attached figure 1 of the specification, the oil injection structure 9 is located on the side surface of the machine body, and the nozzle is arranged along the radial direction of the male rotor), because the oil injection direction of the oil injection port is far away from the meshing position of the male rotor and the female rotor, the oil injection port mainly plays a role in sealing a gap between the tooth top of the rotor and the rotor cavity, the key rotor meshing position cannot be sufficiently injected with sealing oil, so that fluid in the inter-tooth volume is easy to leak through a contact line between the rotors and a leakage triangle, and the volumetric efficiency of the compressor is seriously reduced.

The embodiment of the utility model provides a fuel injection structure 4, its nozzle 42 sets up in screw compressor on the crossing line of positive side chamber 11 and negative side chamber 12, can make the oil body that nozzle 42 jetted out disperse simultaneously in positive side chamber 11 and negative side chamber 12, because the position that positive rotor 2 and negative rotor 3 meshing just in time face the position of positive side chamber 11 with negative side chamber 12 crossing line, consequently, can also make the oil body that nozzle 42 jetted out, distribute in the position of positive rotor 2 and negative rotor 3 meshing, thereby form the oil film in the position of positive rotor 2 and negative rotor 3 mutual contact, not only do benefit to and promote the lubrication, reduce friction, can also reduce by a wide margin and avoid the fluid in the intertooth volume to leak from rotor indirect contact line and the triangle-shaped department of leaking, and then show improvement compressor volumetric efficiency.

It is supplemented that the oil injection structure 4 directly faces to the meshing position of the male rotor 2 and the female rotor 3, and can lubricate the male rotor 2 and the female rotor 3, reduce or avoid friction loss, reduce or avoid contact noise, and improve the operation stability of the compressor; the most important is that the oil injection structure 4 can directly act on the meshing part of the male rotor 2 and the female rotor 3, so that the utilization rate of the oil body can be improved to the optimum, and the using amount of the circulating oil body is greatly reduced; in addition, when the oil body that injection apparatus sprays was the refrigeration oil, can also take place thermal deformation in order to reduce or avoid the rotor to the accurate cooling of rotor meshing department to avoid because of the inconsistent leakage aggravation problem that causes of the contact gap that the overheated deformation of rotor leads to.

Referring to the description of fig. 3, as a further embodiment, the oil injection port 42 is located at the intersection of the male side cavity 11 and the female side cavity 12 and the oil injection reference line 61 in the screw compressor. It will be appreciated that the intersection of the male chamber 11 and the female chamber 12 is a line segment of a certain length, at different positions on which there are still different pressures or corresponding different operating conditions of the rotor, and therefore the position of the oil jet 42 is further defined as the intersection of the male chamber 11 and the female chamber 12 with the oil jet reference line 61.

With continued reference to the description of fig. 3, as a preferred embodiment, the oil injection reference line 61 is the line of contact between the crest line adjacent to the suction closing line of the screw compressor and on the side of the suction closing line remote from the inlet end, and the inner wall of the screw compressor. It should be noted that the space formed by the rotor grooves of the male rotor 2 and the female rotor 3 in the state of the gas to be compressed is still waiting for the gas to be compressed to enter, and the oil injection at this position will occupy the space of the gas to be compressed, resulting in a smaller entering amount of the gas to be compressed; therefore, the oil injection port 42 is disposed on a side of the suction closing line away from the air intake end, specifically, a contact line between a tooth top line of the rotary teeth and an inner wall of the screw compressor on the side of the suction closing line away from the air intake end.

Referring to fig. 3 of the specification, taking the male rotor 2 and the male side cavity 11 as an example, an oil injection reference line 61 is described, that is, a groove in the male rotor 2 in a state of allowing gas to be compressed to enter is defined as an air inlet groove 5, a groove top of the air inlet groove 5 far away from an air inlet end (as shown by an arrow in fig. 3 of the specification, namely a traveling direction of the gas to be compressed, an arrow tail towards the air inlet end, and an arrow tip towards the air outlet end) is a male side air suction closed line 51, a rotary tooth of the male side air suction closed line 51 far away from the air inlet end is an air inlet rear tooth 6, a contact line of the air inlet rear tooth 6 and the male side cavity 11 is the oil injection reference line 61, and an oil injection port 42 is arranged at an intersection of the oil injection reference line 61 and an intersection of the male side cavity 11 and the female side cavity 12. The oil body is sprayed at the position, so that the entering amount of the gas to be compressed is not influenced, and the oil body can play a certain compression role on the compressed fluid. Therefore, the oil injection port 42 is arranged at the intersection of the oil injection reference line 61 and the intersection of the male side cavity 11 and the female side cavity 12, which can ensure that the injected oil mist directly acts on the meshing position of the male rotor 2 and the female rotor 3, can play an auxiliary compression role for the compressed gas and can not occupy the space of the gas to be compressed, thereby obtaining oil mist lubrication for the male rotor 2 and the female rotor 3 which are in the working state of compressing the compressed gas, and forming oil film sealing at the position of the contact line between the rotors and the position of the leakage triangle, further avoiding the compressed gas from leaking from the position of the contact line between the rotors and the position of the leakage triangle, and bringing the effects of reducing temperature, reducing noise, reducing heat loss, improving volumetric efficiency and operation stability.

Referring to the attached fig. 2, as an alternative embodiment, the oil injection structure 4 further includes an oil delivery pipe 41, and the oil delivery pipe 41 leads to the outer wall of the screw compressor housing 1 from an oil injection port 42; the oil delivery pipe 41 forms a passage toward the meshing position of the male rotor 2 and the female rotor 3 in the screw compressor. It will be appreciated that the passage formed by the oil delivery tube 41 towards the meshing position of the male and female rotors 2, 3 ensures that the oil supplied to the oil jets 42 is directed towards the most critical rotor meshing position, thereby achieving optimum sealing and lubrication with a minimum of oil.

Referring to fig. 2 of the specification, as an alternative embodiment, the oil injection structure 4 further includes an oil inlet 43, and the oil inlet 43 is formed on the outer wall of the screw compressor housing 1 by an oil delivery pipe 41; the oil delivery pipe 41 is a straight path between the oil injection port 42 and the oil inlet 43. It should be noted that the oil inlet 43 is opened at the boundary between the oil delivery pipe 41 and the outer wall of the screw compressor housing 1, so that other oil supply facilities can supply oil to the oil jet 42 through the oil delivery pipe 41 via the oil inlet 43. It will be appreciated that the direct path between the oil inlet 43 and the oil jet 42 allows the oil to reach the point to be injected as quickly as possible and reduces the loss of oil pressure in the oil line 41, thereby ensuring that the oil can be injected directly and sufficiently into the meshing position of the male rotor 2 and the female rotor 3.

Referring to the attached fig. 2, as an alternative embodiment, a connecting member 431 is provided at the oil inlet 43 of the oil injection structure 4 for connecting to an oil supply pipe of an oil supply facility, and at least part of the connecting member 431 is formed by an outer wall of the shell 1 of the screw compressor. It can be understood that the connecting member 431 provided at the oil inlet 43 can be used for configuring an oil feeding pipe, and the oil feeding pipe communicates the oil inlet 43 and the oil supply facility, so as to ensure that the oil spraying structure 4 can continuously or intermittently spray oil bodies to the meshing part of the male rotor 2 and the female rotor 3 according to the set requirement. And the oil inlet 43 is set up in the juncture of outer wall of the oil pipe 41 and the housing 1 of the screw compressor, therefore at least part of the connecting piece 431 can be formed by the outer wall of the housing 1 of the screw compressor, thus make the oil pipe link with the housing 1 with good integrity and high strength, have guaranteed the reliability of connection.

In a second aspect, the present invention provides a screw compressor, which includes a casing 1, wherein the inner wall of the casing 1 is provided with the aforementioned oil injection structure 4. It can be understood that the screw compressor is provided with the oil injection structure 4, contact lines and leakage triangles between rotors in the screw compressor can be sprayed by the oil injection structure 4, sealing and lubrication are realized, and therefore the screw compressor has better volumetric efficiency, and meanwhile, the consumption of circulating oil bodies can be reduced, and noise and heat loss are reduced. Use 120m3/h discharge capacity, standard low temperature refrigeration operating mode to take the example to carry out the real operation verification, be equipped with the screw compressor of conventional oil spout structure, oil body circulation volume is about 600 ~ 900kg/h, and the noise is 81 ~ 85dB usually, and is equipped with the utility model discloses the screw compressor of oil spout structure 4 that the embodiment provided, oil body circulation volume is about 480 ~ 550kg/h, average noise 79dB, and it is visible, the circulation oil body use amount reduces by a wide margin, and noise, friction, heat waste scheduling problem are showing and are improving.

As a further example, the inner wall of the casing 1 defines at least a male-side cavity 11 for the configuration of the male rotor 2 and a female-side cavity 12 for the configuration of the female rotor 3; the oil injection structure 4 comprises an oil injection port 42, and the oil injection port 42 is positioned on the intersection line of the male side cavity 11 and the female side cavity 12. It will be appreciated that the inner wall of the partial housing 1 defines the space for housing the male rotor 2 as the male side chamber 11, the inner wall of the partial housing 1 defines the space for housing the female rotor 3 as the female side chamber 12, and the male side chamber 11 intersects the female side chamber 12 at a position corresponding to the engagement of the male rotor 2 with the female rotor 3, so that the oil jet 42 is located at the intersection line of the male side chamber 11 and the female side chamber 12, so as to jet the oil body toward the engagement of the male rotor 2 with the female rotor 3, thereby achieving the best sealing effect and further improving the volumetric efficiency.

As a further example, a male rotor 2 and a female rotor 3, which are meshed with each other, are juxtaposed in a housing 1; the oil injection structure 4 comprises an oil delivery pipe 41, and a passage formed by the oil delivery pipe 41 faces the meshing position of the male rotor 2 and the female rotor 3. It will be appreciated that the male rotor 2 and the female rotor 3 are juxtaposed in the space formed by the housing 1, and the male rotor 2 and the female rotor 3 are intermeshed; and the oil delivery pipe 41 forms a passage facing the meshing position of the male rotor 2 and the female rotor 3, so that oil bodies can be directly injected to the key meshing position of the male rotor 2 and the female rotor 3, and the sealing of a rotor contact line and a leakage triangle and the lubrication of the rotor contact position are realized.

In a third aspect, an embodiment of the present invention provides a refrigeration apparatus, including the foregoing screw compressor. It will be appreciated that the refrigeration appliance, thanks to the provision of the screw compressor described previously, also achieves corresponding technical effects and advantages, such as at least better volumetric efficiency, lower noise, less heat losses, etc.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The oil injection structure is characterized by comprising an oil injection port (42), wherein the oil injection port (42) is positioned on the inner wall of a shell of a screw compressor, and the oil injection port (42) is arranged on the intersection line of a positive side cavity and a negative side cavity in the screw compressor.

2. Oil injection structure according to claim 1, characterized in that the oil injection port (42) is located at the intersection of the line of intersection of the male and female side cavities and the oil injection reference line (61) in the screw compressor.

3. Oil injection structure according to claim 2, characterized in that the reference line (61) of the oil injection is the line of contact between the crest line adjacent to the suction closing line of the screw compressor and located on the side of the suction closing line remote from the inlet end, and the inner wall of the screw compressor.

4. The oil injection structure according to claim 1, characterized by further comprising an oil delivery pipe (41), wherein the oil delivery pipe (41) leads from the oil injection port (42) to an outer wall of the screw compressor housing;

the oil delivery pipe (41) forms a passage facing the meshing position of the male rotor and the female rotor in the screw compressor.

5. Oil injection structure according to claim 4, characterized by further comprising an oil inlet (43), the oil inlet (43) being formed by the oil delivery pipe (41) on an outer wall of the screw compressor housing;

the oil delivery pipe (41) is a straight passage between the oil injection port (42) and the oil inlet (43).

6. Oil injection structure according to claim 5, characterised in that a connection (431) is provided at the oil inlet (43) for connection to an oil supply line of an oil supply facility, at least part of the connection (431) being formed by the outer wall of the housing of the screw compressor.

7. A screw compressor, characterized by comprising a shell (1), wherein the inner wall of the shell (1) is provided with an oil injection structure (4) according to any one of claims 1-6.

8. -screw compressor according to claim 7, characterised in that the inner wall of the casing (1) delimits at least a male-side chamber (11) for the arrangement of the male rotor (2) and a female-side chamber (12) for the arrangement of the female rotor (3).

9. -screw compressor according to claim 7, characterised in that the housing (1) has a male rotor (2) and a female rotor (3) arranged side by side in engagement with each other.

10. A refrigeration apparatus comprising the screw compressor according to any one of claims 7 to 9.

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