CN214247672U

CN214247672U - Double-screw main machine structure with balance piston

Info

Publication number: CN214247672U
Application number: CN202120210072.4U
Authority: CN
Inventors: 卢波涛; 王熙; 吴志朋
Original assignee: Ma'anshan Sailiwen Machinery Co ltd
Current assignee: Ma'anshan Sailiwen Machinery Co ltd
Priority date: 2021-01-25
Filing date: 2021-01-25
Publication date: 2021-09-21
Anticipated expiration: 2031-01-25

Abstract

The utility model discloses a take double screw host structure of balanced piston belongs to doublestage screw rod host computer technical field. The utility model is provided with a front gear box and a rear gear box on two sides of the main cavity body, and a front gear set and a rear gear set are arranged in the front gear box and the rear gear box; the main cavity body is including the one-level compression chamber and the second grade compression chamber that set up from top to bottom, and the top in one-level compression chamber is provided with the air inlet, and the bottom in second grade compression chamber is provided with the gas outlet, and the tip in second grade compression chamber is provided with balanced piston, is provided with one-level screw rod and second grade screw rod in one-level compression chamber and the second grade compression chamber respectively, and the both ends of one-level screw rod link to each other with preceding gear train and rear gear train respectively, and the action of rear gear train drive second grade screw rod. The utility model discloses a solve among the prior art host computer efficiency of twin-screw host computer structure lower, and the too big problem of axial atress of second grade screw rod during high pressure not only can effectively improve host computer efficiency and reduce the host computer size, can also reduce second grade screw rod axial atress.

Description

Double-screw main machine structure with balance piston

Technical Field

The utility model belongs to the technical field of the doublestage screw rod host computer, more specifically says, relates to a take balanced piston's twin-screw host computer structure.

Background

Most of the two-stage screw main machine structures in the current market are in an up-and-down arrangement structure, a front-end gear is in one-to-two transmission, and driven gears of a first-stage screw and a second-stage screw are respectively driven by a driving gear. And the other type is a structure that the first section of screw rod and the second section of screw rod are directly driven by a coupler. The gears of the first up-and-down arrangement structure are distributed according to a delta shape, the front gear box is wider or higher, the center distance is relatively fixed, the modules of the driving gear and the driven gear are required to be consistent, and the change of the gear ratio is limited. The whole machine is relatively wide or high in size, and the use is limited in a narrow whole machine or a drilling machine platform. In the second direct-connection driving structure, the whole host machine is longer in size, so that the whole host machine is larger in size; in addition, the rotating speed matching of the primary host and the secondary host cannot be adjusted, and the efficiency of the hosts cannot be guaranteed. Therefore, it is highly desirable to design a dual-stage screw gear driving structure capable of solving the above problems.

Through retrieval, patents related to the structure of the main machine of the two-stage screw rod are disclosed, such as Chinese patent application numbers: 2018218648258, creation name of utility model: a horizontally-connected double-drive two-stage compression screw main machine comprises a first-stage compression main machine and a second-stage compression main machine, wherein the first-stage compression main machine and the second-stage compression main machine are horizontally connected in series and communicated, and one of a rotor of a male rotor and a rotor of a female rotor in the first-stage compression main machine is sleeved with a rotor of a first-stage permanent magnet motor arranged on the air inlet side of the first-stage compression main machine through a shaft extension and is coaxially and fixedly connected with the rotor; one rotor of the male rotor and the female rotor in the second-stage compression main machine is sleeved with a rotor of a second-stage permanent magnet motor arranged on the exhaust side of the second-stage compression main machine through a shaft extension and is coaxially and fixedly connected with the rotor.

Also as in chinese patent application No.: 201810210609X, name of creation of utility model: a two-stage screw compressor and a compression method are disclosed, and the two-stage screw compressor and the compression method comprise a host, a low-pressure stage drive and a high-pressure stage drive, wherein the host comprises a low-pressure stage shell, a high-pressure stage shell, a low-pressure stage screw rod, an interstage passage and a high-pressure stage screw rod; the low-pressure stage shell is provided with an air inlet cavity and a low-pressure stage air outlet, the low-pressure stage screw rod is arranged in the low-pressure stage shell, and the low-pressure stage drive is directly connected with the low-pressure stage screw rod; the high-pressure stage shell is provided with a high-pressure stage air inlet and a high-pressure air outlet, the high-pressure stage screw rod is arranged in the high-pressure stage shell, and the high-pressure stage drive is directly connected with the high-pressure stage screw rod; two ends of the interstage passage are respectively fixed on the low-pressure stage shell and the high-pressure stage shell, two ends of the interstage passage are respectively communicated with the low-pressure stage exhaust port and the high-pressure stage air inlet, and the interstage passage is provided with a jet hole.

None of the above solutions is a good exploration for twin-screw mainframe structures, but the exploration for twin-screw mainframe structures in the industry has never been stopped.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

The utility model aims at solving among the prior art host computer efficiency of twin-screw host computer structure lower, and the too big problem of axial atress of second grade screw rod during high pressure, provide a take balance piston's twin-screw host computer structure, not only can be adjustable through one, second grade gear speed, effectively improve host computer efficiency and reduce the host computer size, can also make second grade screw rod axial atress reduce.

2. Technical scheme

In order to solve the above problems, the utility model adopts the following technical proposal.

The utility model discloses a double-screw host structure with balance piston, which comprises a main cavity body, wherein a front gear box and a rear gear box are respectively arranged at the two sides of the length direction of the main cavity body, a front gear set and a rear gear set are respectively arranged in the front gear box and the rear gear box, and the front gear set is driven to rotate by a transmission shaft; the main cavity body includes upper and lower parallel arrangement's one-level compression chamber and second grade compression chamber, is linked together between one-level compression chamber and the second grade compression chamber, the top in one-level compression chamber is provided with the air inlet, the bottom in second grade compression chamber is provided with the gas outlet, and keeps away from the tip of exhaust cavity on the second grade compression chamber and be provided with balanced piston, wherein is provided with the one-level screw rod and the second grade screw rod that the level extends in one-level compression chamber and the second grade compression chamber respectively, the both ends of one-level screw rod link to each other with preceding gear train and rear gear train respectively, and rear gear train drive second grade screw rod action.

As a further improvement, the one-level screw rod includes horizontal parallel arrangement's inboard one-level screw rod and outside one-level screw rod of mutually supporting, and the second grade screw rod also includes horizontal parallel arrangement's inboard second grade screw rod and outside second grade screw rod of mutually supporting.

As the utility model discloses further improvement, the tip longitudinal section shape phase-match of keeping away from back gear box on balance piston's the longitudinal section and the second grade compression chamber, and through-hole one and through-hole two have been seted up respectively with inboard second grade screw rod and the corresponding position of outside second grade screw rod in balance piston center, and inboard second grade screw rod and outside second grade screw rod are close to balance piston's tip and fix respectively in through-hole one and through-hole two.

As a further improvement, the bolt holes have all been seted up to the balance piston periphery and the corresponding position of second grade compression chamber tip lateral wall, and fastening bolt passes the bolt hole on balance piston and the second grade compression chamber tip lateral wall in proper order and fixes the balance piston at second grade compression chamber tip.

As a further improvement, the utility model discloses still including setting up the branch oil cake on the external lateral wall of main cavity, be provided with into oil pipe on the branch oil cake, advance oil pipe and include the balanced piston that links to each other with balanced piston and advance oil pipe.

As a further improvement of the utility model, the front gear group includes one-level driving gear and the one-level driven gear that links to each other with the transmission shaft, and one-level driving gear and one-level driven gear mesh mutually, and the one end of inboard one-level screw rod links to each other with one-level driven gear, and the other end of inboard one-level screw rod links to each other with the second grade driving gear, and the second grade driving gear meshes mutually with the second grade driven gear of below, and the second grade driven gear links to each other with the tip of inboard second grade screw rod.

As a further improvement, the rear gear box is hemispherical.

As a further improvement, the length of the secondary screw is less than that of the primary screw.

As a further improvement of the utility model, a safety valve is arranged on the outer side wall of the main cavity body.

3. Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model discloses a take double screw host computer structure of balanced piston, the integrated design in one-level compression chamber and second grade compression chamber under the parcel of rear gear case, has not only reduced the host computer size, has still effectively realized the reduction of noise and vibration. The exhaust of the first-stage compression cavity is communicated with the suction of the second-stage compression cavity, so that the first-stage exhaust and the second-stage suction are communicated, the interstage pressure loss is smaller, and the efficiency of the main engine is effectively improved.

(2) The utility model discloses a take double screw host computer structure of balanced piston, the gear train rotates before the transmission shaft drive, preceding gear train drives the one-level screw rod and rotates with the back gear train that the tip of one-level screw rod keeping away from preceding gear train links to each other, back gear train and then drive the second grade screw rod and rotate, only need adjust the speed of joining in marriage of preceding gear train, the speed of joining in marriage of gear train after can the synchronous adjustment, realize the matching of one-level compression chamber and second grade compression intracavity pressure and tolerance, reach the best power of screw rod host computer. The main engine is prevented from being arranged in a traditional triangular structure, the proportion of three gears is difficult to adjust consistently, and the optimal power of the screw main engine is difficult to realize.

(3) The utility model discloses a take double screw host structure of balanced piston, through-hole one and through-hole two have been seted up respectively with inboard second grade screw rod and the corresponding position of outside second grade screw rod in balanced piston center, inboard second grade screw rod and outside second grade screw rod are close to the tip of balanced piston and fix respectively in through-hole one and through-hole two, it is spacing to be used for carrying out the tip to inside, outside second grade screw rod, further prevent effectively that interior, outside second grade screw rod from taking place the axial deflection, guaranteed interior, outside second grade screw rod is in the axial balance state all the time, the life of second grade screw rod has further been improved.

(4) The utility model discloses a take double screw host computer structure of balanced piston, the bolt hole has all been seted up with the corresponding position of second grade compression chamber end portion lateral wall in balanced piston periphery, fastening bolt passes the bolt hole on balanced piston and the second grade compression chamber end portion lateral wall in proper order and fixes balanced piston at second grade compression chamber end, a part exhaust pressure for offsetting the second grade compression intracavity, make second grade screw rod axial atress comparatively even, second grade screw rod axial balance has been guaranteed, second grade compression chamber and second grade screw rod have improved the life of second grade screw rod because the axial atress causes the bearing to damage greatly when avoiding the high pressure, and then ensured host computer efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a twin-screw main machine structure with a balance piston according to the present invention;

fig. 2 is a schematic structural view of the twin-screw main machine structure with the balance piston according to another angle of the present invention;

FIG. 3 is a schematic cross-sectional structural view of a twin-screw main machine structure with a balance piston according to the present invention;

fig. 4 is a schematic view of the internal structure of a twin-screw main machine structure with a balance piston according to the present invention;

FIG. 5 is a schematic view of the structure of the main chamber of the present invention;

FIG. 6 is a schematic structural view of the air intake chamber of the present invention;

fig. 7 is a schematic structural view of the middle air outlet cavity of the present invention;

fig. 8 is a schematic structural diagram of the middle balance piston of the present invention.

The reference numbers in the figures are:

110. a front gearbox; 111. a front gear set; 11. a primary driving gear; 12. a primary driven gear; 120. an air inlet cavity; 121. a first communicating cavity; 122. a primary air intake chamber; 123. a first mounting hole; 124. a second mounting hole; 125. a third mounting hole; 130. a main chamber; 131. an air inlet; 132. an air outlet; 133. a first stage compression chamber; 134. a secondary compression chamber; 101. a first-stage screw; 102. a secondary screw; 140. an exhaust cavity; 141. a first bearing hole; 142. a second bearing hole; 143. a bearing hole III; 144. a bearing hole IV; 145. a section of exhaust port; 146. a second section of exhaust port; 150. a rear gearbox; 151. a rear gear set; 13. a secondary drive gear; 14. a secondary driven gear; 160. a balance piston; 170. a drive shaft; 180. a safety valve;

200. oil separation blocks; 210. an oil inlet pipe of the front gear box; 220. a front gearbox oil return pipe; 230. an oil inlet pipe I of the exhaust cavity; 240. a main cavity oil return pipe; 250. an oil inlet pipe of the rear gear box; 260. an oil inlet pipe of the secondary compression cavity; 270. a balance piston oil inlet pipe; 280. and an oil inlet pipe II of the exhaust cavity.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present invention will be further described with reference to the following examples.

Example 1

With reference to fig. 1 to 8, the twin-screw main machine structure with a balance piston of the present embodiment includes a main cavity 130, two sides of the main cavity 130 in the length direction are respectively provided with a front gear box 110 and a rear gear box 150, a front gear set 111 and a rear gear set 151 are respectively installed in the front gear box 110 and the rear gear box 150, and the front gear set 111 is driven by a transmission shaft 170 to rotate; main cavity 130 includes upper and lower parallel arrangement's one-level compression chamber 133 and second grade compression chamber 134, is linked together between one-level compression chamber 133 and the second grade compression chamber 134, and the top of one-level compression chamber 133 is provided with air inlet 131, and the bottom of second grade compression chamber 134 is provided with gas outlet 132, wherein is provided with the one-level screw rod 101 and the second grade screw rod 102 of horizontal extension in one-level compression chamber 133 and the second grade compression chamber 134 respectively. The integrated design of the first-stage compression cavity 133 and the second-stage compression cavity 134 in this embodiment not only reduces the size of the main engine, but also effectively reduces noise and vibration under the wrapping of the rear gear box 150. The exhaust of the first-stage compression cavity 133 is communicated with the suction of the second-stage compression cavity 134, so that the first-stage exhaust and the second-stage suction are communicated, the pressure loss between stages is smaller, and the efficiency of a main engine is effectively improved.

In this embodiment, two ends of the first-stage screw 101 are respectively connected to the front gear set 111 and the rear gear set 151, and the rear gear set 151 drives the second-stage screw 102 to move, the first-stage screw 101 includes the inner-side first-stage screw 101 and the outer-side first-stage screw 101 which are horizontally parallel arranged and are mutually matched, the second-stage screw 102 also includes the inner-side second-stage screw 102 and the outer-side second-stage screw 102 which are horizontally parallel arranged and are mutually matched, wherein the outer-side first-stage screw 101 and the inner-side first-stage screw 101 are matched to form the male-female first-stage screw 101, the outer-side second-stage screw 102 and the inner-side second-stage screw 102 form the male-female second-stage screw 102, and the length of the second-stage screw 102 is smaller than that of the first-stage screw 101. Specifically, in this embodiment, the transmission shaft 170 drives the front gear set 111 to rotate, the front gear set 111 drives the first-stage screw 101 and the rear gear set 151 connected to the end of the first-stage screw 101 far away from the front gear set 111 to rotate, the rear gear set 151 further drives the second-stage screw 102 to rotate, the speed of the rear gear set 151 can be synchronously adjusted only by adjusting the speed of the front gear set 111, matching of the pressure and the air volume in the first-stage compression cavity 133 and the second-stage compression cavity 134 is achieved, and the optimal power of the screw host is achieved. The main engine is prevented from being arranged in a traditional triangular structure, the proportion of three gears is difficult to adjust consistently, and the optimal power of the screw main engine is difficult to realize.

As shown in fig. 4, the front gear set 111 in this embodiment includes a first driving gear 11 and a first driven gear 12 connected to the transmission shaft 170, the first driving gear 11 is engaged with the first driven gear 12, one end of the inner first screw 101 is connected to the first driven gear 12, the other end of the inner first screw 101 is connected to a second driving gear 13, the second driving gear 13 is engaged with the lower second driven gear 14, and the second driven gear 14 is connected to the end of the inner second screw 102. The inner primary screw 101 is driven by the front gear set 111 to rotate and drives the outer primary screw 101 to synchronously extrude and rotate, so that primary compression pressurization treatment on air is completed, and after primary compression pressurization, the pressure of gas can reach 7kgf/cm²-8kgf/cm²(ii) a The inner first-stage screw 101 drives the second-stage driving gear 13 to rotate while rotating and synchronously drives the meshed second-stage driven gear 14 to rotate, the inner second-stage screw 102 rotates under the drive of the second-stage driven gear 14 and drives the outer second-stage screw 102 to synchronously extrude and rotate, so that the second-stage compression and pressurization treatment on air is completed, and after the second-stage compression and pressurization, the pressure of gas can reach 20kgf/cm²-40kgf/cm²And the compression efficiency of air is effectively improved.

As shown in fig. 1, in this embodiment, a balance piston 160 is disposed at an end of the second-stage compression cavity 134 far from the exhaust cavity 140, and a longitudinal section of the balance piston 160 matches with a longitudinal section of an end of the second-stage compression cavity 134 far from the rear gear box 150, so as to be better attached and fixed to the end of the second-stage compression cavity 134. As shown in fig. 8, in this embodiment, a first through hole and a second through hole are respectively formed in the center of the balance piston 160 and in positions corresponding to the inner-side second-stage screw 102 and the outer-side second-stage screw 102, and ends of the inner-side second-stage screw 102 and the outer-side second-stage screw 102 close to the balance piston 160 are respectively fixed in the first through hole and the second through hole for limiting ends of the inner-side second-stage screw 102 and the outer-side second-stage screw 102, so that axial offset of the inner-side second-stage screw 102 and the outer-side second-stage screw 102 is further effectively prevented, the inner-side second-stage screw 102 and the outer-side second-stage screw 102 are always in an axial balance state, and the service life of the second-stage screw 102 is further prolonged.

As shown in fig. 1, in the present embodiment, an intake cavity 120 and an exhaust cavity 140 are respectively disposed at two longitudinal sides of a main cavity 130, and a front gear box 110 and a rear gear box 150 are respectively disposed at opposite outer sides of the intake cavity 120 and the exhaust cavity 140. As shown in fig. 6, the air inlet cavity 120 in this embodiment includes a first communicating cavity 121 and a first level air inlet cavity 122 that are arranged in parallel along the width direction, the first communicating cavity 121 is communicated with the air inlet 131, and the first level air inlet cavity 122 is communicated with the air inlet end of the first level compression cavity 133, that is, after the air enters the first communicating cavity 121 through the air inlet 131, the air enters the first level compression cavity 133 through the first level air inlet cavity 122 and starts to be compressed by the first level screw 101 to do work, the work path of the air is from the head to the tail of the first level air inlet cavity 122, the length of the work path is effectively increased, and the efficiency of the first level compression is improved.

As shown in fig. 4 and 6, in the present embodiment, a first mounting hole 123 and a second mounting hole 124 are respectively formed in the intake cavity 120 at positions corresponding to the first-stage screws 101 at the inner side and the outer side, an end of the first-stage screw 101 at the inner side passes through the first mounting hole 123 and is connected to the first-stage driven gear 12, and an end of the first-stage screw 101 at the outer side is fixed in the second mounting hole 124. The air inlet cavity 120 is provided with a third mounting hole 125 at a position corresponding to the first-stage driving gear 11, the first-stage driving gear 11 is sleeved on the periphery of the transmission shaft 170, and the end part of the transmission shaft 170 close to the air inlet cavity 120 is rotatably fixed in the third mounting hole 125. The tight fit between air inlet cavity 120 and one-level screw 101 is connected, can effectively reduce the host computer size, and the integrated level is high, the dismouting of being convenient for and use.

As shown in fig. 7, the exhaust chamber 140 in this embodiment includes a first section of exhaust opening 145 and a second section of exhaust opening 146 disposed up and down along the height direction, the first section of exhaust opening 145 is communicated with the outlet end of the first-stage compression cavity 133, the outlet end of the first section of exhaust opening 145 is communicated with the inlet end of the second-stage compression cavity 134, the outlet end of the second-stage compression cavity 134 is communicated with the inlet end of the second section of exhaust opening 146, and the outlet end of the second section of exhaust opening 146 is connected with the outlet 132. Gas is discharged into one section gas vent 145 after first-stage screw 101 is compressed, is discharged into the second-stage gas vent 146 below from one section gas vent 145, and enters the second-stage compression cavity 134 through the second-stage gas vent 146 to be subjected to second-stage compression treatment, and the direct connection between the first-stage compression cavity 133 and the second-stage compression cavity 134 is realized through the gas discharge cavity 140, so that the pressure loss is reduced, the host efficiency is further improved, the product cost is reduced, and the product competitiveness is improved.

In this embodiment, a second bearing hole 142 and a first bearing hole 141 are respectively formed in the exhaust cavity 140 at positions corresponding to the first-stage screw 101 at the inner side and the outer side, an end portion of the first-stage screw 101 at the inner side, which is close to the exhaust cavity 140, penetrates through the second bearing hole 142 to be connected with the second-stage driving gear 13, and an end portion of the first-stage screw 101 at the outer side, which is close to the exhaust cavity 140, is fixed in the first bearing hole 141. The exhaust cavity 140 is provided with a bearing hole IV 144 and a bearing hole III 143 at positions corresponding to the two-stage screws 102 at the inner side and the outer side respectively, the end part of the inner two-stage screw 102 close to the exhaust cavity 140 penetrates through the bearing hole IV 144 to be connected with the two-stage driven gear 14, and the end part of the outer two-stage screw 102 close to the exhaust cavity 140 is fixed in the bearing hole III 143. The exhaust cavity 140 is closely matched with the ends of the primary screw 101 and the secondary screw 102, so that the size of the main machine can be further reduced. The host structure of this embodiment obtains good application on the supporting platform of rig, because original host structure size is big, the rig space is not enough, unable assembly, and the host structure of adopting this embodiment can directly assemble on the platform, can realize rig and air compressor machine integration.

Example 2

The double-screw main machine structure with the balance piston in the embodiment has the same basic structure as that in embodiment 1, and further, as shown in fig. 1, the double-screw main machine structure further comprises an oil distribution block 200 arranged on the outer side wall of the main cavity 130, wherein the oil distribution block 200 is used for distributing and conveying lubricating and cooling oil to each part inside the double-screw main machine structure, so that not only can each part inside the double-screw main machine structure be cooled, but also the rotating part can be lubricated. In this embodiment, the oil distribution block 200 is provided with a plurality of oil inlet pipes, wherein each oil inlet pipe includes a front gearbox oil inlet pipe 210 connected to the top of the front gearbox 110, specifically, as shown in fig. 3, in this embodiment, the lubricating oil enters the front gearbox 110 through the front gearbox oil inlet pipe 210 and then is divided into three paths, the first path is used for cooling and lubricating the transmission shaft 170 and mechanical seals and bearings arranged on the transmission shaft 170, and a layer of dense oil seal is formed on the periphery of the transmission shaft 170, so as to further enhance the sealing effect of the transmission shaft 170; the second path is used for cooling and lubricating the front gear set 111, so that the normal operation of the front gear set 111 is ensured, and the situation of blockage or high-temperature damage is avoided; the third path is used for cooling and lubricating the rotating end part of the first-stage screw 101 in the air inlet cavity 120, so that the abrasion of the rotating end part of the first-stage screw 101 is reduced, and the service life of the first-stage screw 101 is prolonged. Preceding gear box 110's bottom is provided with preceding gear box in this embodiment and returns oil pipe 220, preceding gear box returns oil pipe 220 and is linked together with one-level compression chamber 133 far away from preceding gear box 110's tip, preceding gear box returns oil pipe 220 and advances oil pipe 210 through preceding gear box and get into the inside lubricating oil of preceding gear box 110 and carry out recovery processing, concentrate the lubricating oil of retrieving and squeeze into inside one-level compression chamber 133, carry out cooling treatment to the inside one-level screw rod 101 of one-level compression chamber 133 and compressed air, reduce the temperature of breathing in of one-level compression chamber 133, improve the adiabatic efficiency of one-level compression process, thereby reduce one-level compression energy consumption, the host efficiency is improved.

The oil inlet pipe in this embodiment further comprises an exhaust cavity oil inlet pipe 230 connected with the top of the exhaust cavity 140, and the exhaust cavity oil inlet pipe 230 is used for spray cooling of the first-level screw 101, so that the first-level screw 101 and compressed air can be further cooled and cooled, and the first-level compression energy consumption can be further reduced. The oil inlet pipe in this embodiment further includes a rear gearbox oil inlet pipe 250 connected to the top of the rear gearbox 150, and is used for cooling and lubricating the rear gear set 251, so as to ensure the normal operation of the rear gear set 251, avoid the occurrence of jamming or high-temperature damage, and prolong the service life of the rear gear set 251. Wherein rear gear box 150's bottom is provided with the main cavity body and returns oil pipe 240, the main cavity body returns oil pipe 240 and keeps away from rear gear box 150's tip and main cavity body 130 middle part and links to each other, the main cavity body returns oil pipe 240 and is used for collecting the lubricating oil in rear gear box 150 and squeezes into the top in second grade compression chamber 134, a second grade screw rod 102 and the air that is used for inside second grade compression chamber 134 carries out cooling and handles, reduce the temperature of breathing in second grade compression chamber 134, improve the adiabatic efficiency of second grade compression process, thereby reduce the second grade compression energy consumption, the host efficiency has further been improved.

The oil inlet pipe in this embodiment further includes a second-stage compression cavity oil inlet pipe 260 connected with the second-stage compression cavity 134, and the second-stage compression cavity oil inlet pipe 260 is used for spraying, cooling and lubricating the second-stage screw 102, further reducing the temperature of compressed air in the second-stage compression cavity 134, and improving the service life and the host efficiency of the second-stage screw 102. The oil inlet pipe in this embodiment further includes an exhaust cavity oil inlet pipe II 280 connected to the lower portion of the exhaust cavity 140, and the exhaust cavity oil inlet pipe II 280 is used for spray cooling of the second-stage screw 102, and further performs cooling and lubrication processing on the rotating end portion of the second-stage screw 102 in the exhaust cavity 140, so that the wear condition of the rotating end portion of the second-stage screw 102 is reduced, and the service life of the second-stage screw 102 is prolonged. In this embodiment, three lubricating oils are provided at the end, the top and the front of the second-stage screw 102, and the second-stage screw 102 and the air in the second-stage compression cavity 134 are cooled comprehensively, so that the normal use of the second-stage screw 102 can be effectively ensured, the compression energy consumption in the second-stage compression cavity 134 can be reduced, and the efficiency of the main engine can be improved.

Example 3

The basic structure of the twin-screw host machine structure with the balance piston in this embodiment is the same as that in embodiment 1, further, as shown in fig. 8, bolt holes are formed in the periphery of the balance piston 160 and the corresponding positions of the side walls of the end portions of the second-stage compression cavities 134 in this embodiment, fastening bolts sequentially pass through the bolt holes in the side walls of the end portions of the balance piston 160 and the second-stage compression cavities 134 and fix the balance piston 160 at the end portions of the second-stage compression cavities 134 to offset a part of exhaust pressure in the second-stage compression cavities 134, so that the axial stress of the second-stage screws 102 is relatively uniform, the axial balance of the second-stage screws 102 is ensured, bearing damage caused by the overlarge axial stress of the second-stage compression cavities 134 and the second-stage screws 102 during high pressure is avoided, the service life of the second-stage screws 102 is prolonged, and the host machine efficiency is further ensured.

In this embodiment, the oil inlet pipe further includes a balance piston oil inlet pipe 270 connected to the balance piston 160, the oil inlet end of the balance piston oil inlet pipe 270 is connected to the oil distribution block 200, a three-way valve is disposed at an end of the balance piston oil inlet pipe 270 close to the balance piston oil inlet pipe 270, the lubricating oil in the balance piston oil inlet pipe 270 is divided into two paths, one path directly enters the balance piston oil inlet pipe 270 to cool and lubricate the ends of the balance piston 160 and the second-stage screw 102, the other path is connected to an exhaust cavity oil inlet pipe two 280, the temperature of the rotating end of the second-stage screw 102 in the exhaust cavity 140 is further lowered and lubricated, the wear of the rotating ends of the two sides of the second-stage screw 102 is reduced, and the service life of the second-stage screw 102 is prolonged.

As shown in fig. 2, in this embodiment, a safety valve 180 is further disposed on an outer side wall of the main cavity 130, so that the compressed air in the main cavity 130 can be decompressed, thereby avoiding safety accidents caused by excessive pressure of the compressed air in the main cavity 130, and further improving the use safety of the product. The shape of the rear gear box 150 in this embodiment is hemispherical, which can bear a large pressure, and further ensure the strength and the safety of the main machine structure.

The examples of the utility model are only right the utility model discloses a preferred embodiment describes, and not right the utility model discloses design and scope are injectd, do not deviate from the utility model discloses under the prerequisite of design idea, the field engineering technical personnel are right the utility model discloses a various deformation and improvement that technical scheme made all should fall into the protection scope of the utility model.

Claims

1. The utility model provides a take double screw host structure of balanced piston which characterized in that: the gear box comprises a main cavity (130), wherein a front gear box (110) and a rear gear box (150) are respectively arranged on two sides of the main cavity (130) in the length direction, a front gear set (111) and a rear gear set (151) are respectively arranged in the front gear box (110) and the rear gear box (150), and the front gear set (111) is driven to rotate by a transmission shaft (170); the main cavity (130) is linked together between one-level compression chamber (133) and second grade compression chamber (134) including upper and lower parallel arrangement's one-level compression chamber (133) and second grade compression chamber (134), the top of one-level compression chamber (133) is provided with air inlet (131), the bottom of second grade compression chamber (134) is provided with gas outlet (132), and keeps away from the tip of exhaust cavity (140) on second grade compression chamber (134) and be provided with balanced piston (160), wherein be provided with one-level screw rod (101) and second grade screw rod (102) that the level extends in one-level compression chamber (133) and second grade compression chamber (134) respectively, the both ends of one-level screw rod (101) link to each other with preceding gear train (111) and rear gear train (151) respectively, and rear gear train (151) drive second grade screw rod (102) action.

2. The twin-screw main machine structure with the balance piston as claimed in claim 1, wherein: the first-stage screw (101) comprises an inner first-stage screw (101) and an outer first-stage screw (101) which are horizontally arranged in parallel and matched with each other, and the second-stage screw (102) also comprises an inner second-stage screw (102) and an outer second-stage screw (102) which are horizontally arranged in parallel and matched with each other.

3. The twin-screw main machine structure with the balance piston as claimed in claim 2, wherein: the longitudinal section of the balance piston (160) is matched with the longitudinal section of the end part, far away from the rear gear box (150), of the secondary compression cavity (134), a first through hole and a second through hole are formed in the center of the balance piston (160) and the positions, corresponding to the inner secondary screw (102) and the outer secondary screw (102), of the balance piston (160), and the end parts, close to the balance piston (160), of the inner secondary screw (102) and the outer secondary screw (102) are fixed in the first through hole and the second through hole respectively.

4. The twin-screw main machine structure with balance pistons of claim 3, wherein: bolt holes are formed in the periphery of the balance piston (160) and in the position corresponding to the end side wall of the second-stage compression cavity (134), and fastening bolts sequentially penetrate through the bolt holes in the balance piston (160) and the end side wall of the second-stage compression cavity (134) and fix the balance piston (160) at the end of the second-stage compression cavity (134).

5. The twin-screw main machine structure with the balance piston as claimed in claim 4, wherein: the oil distribution device is characterized by further comprising an oil distribution block (200) arranged on the outer side wall of the main cavity (130), wherein an oil inlet pipe is arranged on the oil distribution block (200), and the oil inlet pipe comprises a balance piston oil inlet pipe (270) connected with a balance piston (160).

6. The twin-screw main machine structure with the balance piston as claimed in claim 2, wherein: preceding gear train (111) is including one-level driving gear (11) and one-level driven gear (12) that link to each other with transmission shaft (170), one-level driving gear (11) and one-level driven gear (12) mesh mutually, the one end and the one-level driven gear (12) of inboard one-level screw rod (101) link to each other, and the other end and second grade driving gear (13) of inboard one-level screw rod (101) link to each other, second grade driving gear (13) mesh mutually with second grade driven gear (14) of below, and second grade driven gear (14) link to each other with the tip of inboard second grade screw rod (102).

7. The twin-screw main machine structure with balance pistons of any one of claims 1 to 6, wherein: the rear gear case (150) is shaped like a hemisphere.

8. The twin-screw main machine structure with balance pistons of claim 7, wherein: the length of the secondary screw (102) is less than that of the primary screw (101).

9. The twin-screw main machine structure with the balance piston as claimed in claim 1, wherein: the outer side wall of the main cavity (130) is also provided with a safety valve (180).