CN216895065U - Steam compressor and test device for steam compressor - Google Patents

Abstract

The application discloses vapor compressor and be used for vapor compressor's test device belongs to the vapor compressor field. The steam compressor comprises an impeller cover, a volute, a diffusion guide vane, an impeller, a locking nut, a shaft sleeve and a sealing component; one end of the mounting shaft is sleeved with the impeller and the impeller is fixed at the end by a locking nut; a shaft sleeve is sleeved on the mounting shaft positioned on the back of the impeller, a volute is sleeved on the outer side of the shaft sleeve, and a sealing component is clamped in a sealing cavity between the volute and the shaft sleeve; one end of the mounting shaft, which is provided with the impeller, extends into the inner cavity of the impeller cover, and a fixing ring of the impeller cover is fixed with the fixing end face of the volute; the end face, close to the volute, of the impeller cover is provided with a plurality of diffusion guide vanes, and the plurality of diffusion guide vanes are annularly arrayed around the axis of the impeller cover and are integrally formed with the impeller cover; or the inner end face of the volute, which is close to the impeller cover, is provided with a plurality of diffuser vanes which are annularly arrayed around the axis of the volute and are integrally formed with the volute. The application has the advantages of simple structure and higher safety and reliability.

Description

Steam compressor and test device for steam compressor

Technical Field

The application relates to vapor compressor technical field especially relates to a vapor compressor and be used for vapor compressor's test device.

Background

The steam compressor is a key device of a heat recovery system for increasing the temperature and the pressure of generated steam through the compression action, and can pressurize and heat low-pressure (or low-temperature) steam to meet the temperature and pressure requirements required by a process or engineering. At present, the steam compressor is widely applied to the industries of environmental protection, chemical water treatment and the like, the temperature of low-temperature steam is increased after the low-temperature steam is acted by the steam compressor, the obtained high-temperature steam is continuously utilized, and the energy consumption is greatly reduced.

The existing steam compressor has the advantages that the structure of the steam compressor is complex due to the arrangement mode of the diffuser guide vane, and the safety and reliability are low.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a steam compressor, can solve the current steam compressor's diffusion stator's the mode of setting up and make steam compressor's structure complicated, the lower problem of fail safe nature.

In a first aspect, an embodiment of the present invention provides a vapor compressor, including an impeller casing, a volute, a diffuser vane, an impeller, a lock nut, a shaft sleeve, and a sealing component; one end of the mounting shaft is sleeved with the impeller and the impeller is fixed at the end by the locking nut; a shaft sleeve is sleeved on the mounting shaft positioned on the back of the impeller, the volute is sleeved on the outer side of the shaft sleeve, and the sealing component is clamped in a sealing cavity between the volute and the shaft sleeve; one end of the mounting shaft, which is provided with the impeller, extends into an inner cavity of the impeller cover, and a fixing ring of the impeller cover is fixed with a fixing end face of the volute; a plurality of diffuser vanes are arranged on the end face, close to the volute, of the impeller cover, and are annularly arrayed around the axis of the impeller cover and integrally formed with the impeller cover; or the volute is close to the inner end face of the impeller cover, a plurality of diffuser guide vanes are arranged on the inner end face of the volute, and the diffuser guide vanes surround the axial line annular array of the volute and are integrally formed with the volute.

With reference to the first aspect, in a possible implementation manner, an outer peripheral wall of the impeller housing where the impeller housing is matched with the volute housing is provided with a plurality of sealing ring grooves; the sealing ring grooves are radially recessed along the peripheral wall of the impeller cover and surround the peripheral wall of the impeller cover for a circle, and the sealing ring grooves are arranged at intervals along the axial direction of the impeller cover; or a plurality of sealing ring grooves are formed in the inner side wall of the volute, which is matched with the impeller cover; the seal ring groove is followed the radial recess of the inside wall of spiral case and duplex winding the inside wall round of spiral case, and it is a plurality of the seal ring groove is followed the axial interval of spiral case sets up.

With reference to the first aspect, in one possible implementation, the vapor compressor further includes a seal; the sealing piece is arranged between the fixing ring of the impeller cover and the fixing end face of the volute.

With reference to the first aspect, in one possible implementation manner, the vapor compressor further includes a dust cover; the dustproof cover is sleeved on the middle of the mounting shaft and arranged on the rear end face of the sealing cavity.

With reference to the first aspect, in one possible implementation manner, the vapor compressor further includes a seal ring; one end of the shaft sleeve, which is close to the impeller, is provided with a circle of sealing groove which is recessed inwards from the end surface, and the sealing ring is arranged in the sealing groove.

With reference to the first aspect, in one possible implementation manner, the impeller shroud further includes a plurality of reinforcing ribs; the reinforcing ribs are arranged in the space outside the inlet section of the impeller casing and are annularly arrayed around the axis of the impeller casing.

In a second aspect, an embodiment of the present invention provides a testing apparatus for a vapor compressor, including a motor, a first coupler, a fluid coupling, a second coupler, a torque and rotation speed sensor, a third coupler, a step-up gear box, and the vapor compressor; two ends of the first coupler are respectively connected with the output end of the motor and the input end of the hydraulic coupler; two ends of the second coupling are respectively connected with the output end of the hydraulic coupler and the input end of the torque and rotation speed sensor; two ends of the third coupler are respectively connected with the output end of the torque and rotation speed sensor and the input end of the speed-up gear box; and the mounting shaft of the speed increasing gear box is connected with the steam compressor.

With reference to the second aspect, in one possible implementation manner, the impeller is connected with the mounting shaft of the gearbox by means of conical interference fit.

With reference to the second aspect, in one possible implementation manner, the vapor compressor further includes a check bolt; the front end of the locking nut is provided with a threaded through hole; the shaft head of the mounting shaft is provided with a threaded blind hole which is recessed inwards along the front end face, the front end of the shaft lever of the mounting shaft is provided with a radial oil return through hole, and an axial communication hole is formed from the bottom of the threaded blind hole to the middle of the oil return through hole; the outer peripheral wall of the shaft rod is provided with a spiral oil groove which is communicated with the oil return through hole; when the locking nut is sleeved on the mounting shaft, the locking bolt can be screwed into the threaded through hole and the threaded blind hole.

With reference to the second aspect, in one possible implementation, the test rig for a vapor compressor further comprises an integrated base; the motor, the hydraulic coupler, the torque and rotating speed sensor and the speed-up gear box are all arranged on the integrated base.

One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

the embodiment of the utility model provides a steam compressor which comprises an impeller cover, a volute, a diffusion guide vane, an impeller, a locking nut, a shaft sleeve and a sealing component. One end of the mounting shaft is sleeved with the impeller and the impeller is fixed at the end by a locking nut. The shaft sleeve is sleeved on the mounting shaft positioned on the back of the impeller, the volute is sleeved on the outer side of the shaft sleeve, and the sealing component is clamped in the sealing cavity between the volute and the shaft sleeve. One end of the mounting shaft, which is provided with the impeller, extends into the inner cavity of the impeller cover, and the fixing ring of the impeller cover is fixed with the fixing end face of the volute. The end face, close to the volute, of the impeller cover is provided with a plurality of diffusion guide vanes which are annularly arrayed around the axis of the impeller cover and are integrally formed with the impeller cover. Or the inner end surface of the volute, which is close to the impeller cover, is provided with a plurality of diffuser vanes which are annularly arrayed around the axis of the volute and are integrally formed with the volute. The steam compressor that this application embodiment provided, because diffusion stator and the terminal surface integrated into one piece that is close to the spiral case of impeller cover, perhaps diffusion stator and the interior terminal surface integrated into one piece that is close to the impeller cover of spiral case to can reduce steam compressor's spare part, simplify its structure, improve steam compressor operation's fail safe nature.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a vapor compressor provided in an embodiment of the present application;

FIG. 2 is a first schematic structural view of an impeller shroud provided in an embodiment of the present application;

FIG. 3 is a schematic structural view of an impeller shroud according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a mounting shaft provided in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a bushing provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of a test apparatus for a vapor compressor according to an embodiment of the present application.

Icon: 1-a motor; 2-a first coupling; 3-a fluid coupling; 4-a second coupling; 5-torque rotational speed sensor; 6-a third coupling; 7-a step-up gear box; 71-mounting the shaft; 711-a shaft head; 712-a shaft rod; 713-threaded blind hole; 714-axial communication hole; 715-oil return through holes; 716-helical oil groove; 8-a vapor compressor; 81-impeller shroud; 811-a fixed ring; 812-a seal groove; 813-reinforcing ribs; 82-a volute; 83-diffuser vanes; 84-an impeller; 85-locking nut; 86-shaft sleeve; 861-seal the groove; 87-a sealing member; 88-a seal; 89-a dust cover; 810-lockbolt; 811-connecting disc; 9-integrated base.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments 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 in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

Referring to fig. 1, an embodiment of the present invention provides a vapor compressor 8, which includes an impeller housing 81, a volute 82, diffuser vanes 83, an impeller 84, a lock nut 85, a shaft sleeve 86, and a sealing member 87. The impeller 84 is fitted around one end of the mounting shaft 71 and the impeller 84 is fixed to the one end by a lock nut 85. The mounting shaft 71 is a main shaft of the speed increasing gear box 7. The shaft sleeve 86 is sleeved on the mounting shaft 71 positioned at the back of the impeller 84, the volute 82 is sleeved outside the shaft sleeve 86, and the sealing component 87 is clamped in the sealing cavity between the volute 82 and the shaft sleeve 86. One end of the mounting shaft 71, at which the impeller 84 is disposed, extends into an inner cavity of the impeller housing 81, and a fixing ring 811 of the impeller housing 81 is fixed to a fixing end surface of the scroll 82. An end surface of the impeller shroud 81 near the volute 82 is provided with a plurality of diffuser vanes 83, and the plurality of diffuser vanes 83 are annularly arrayed around the axis of the impeller shroud 81 and are integrally formed with the impeller shroud 81. Or, a plurality of diffuser vanes 83 are arranged on the inner end surface of the volute 82 close to the impeller cover 81, and the diffuser vanes 83 are annularly arrayed around the axis of the volute 82 and integrally formed with the volute 82, so that the parts of the steam compressor 8 are reduced, the structure of the steam compressor is simplified, and the safety and reliability of the operation of the steam compressor 8 are improved.

The steam compressor 8 provided by the embodiment of the application has the advantages that the diffusion guide vane 83 and the end face, close to the volute 82, of the impeller cover 81 are integrally formed, or the diffusion guide vane 83 and the inner end face, close to the impeller cover 81, of the volute 82 are integrally formed, so that the parts of the steam compressor 8 can be reduced, the structure of the steam compressor is simplified, and the safety and reliability of the operation of the steam compressor 8 are improved.

As shown in fig. 2, the outer peripheral wall of the impeller cup 81 where it is fitted with the scroll 82 is provided with a plurality of seal ring grooves 812. The number of seal ring grooves 812 can be three, four, five, etc., and fig. 2 shows a schematic view of three seal ring grooves 812. The seal ring groove 812 is radially recessed along the outer peripheral wall of the impeller cup 81 and surrounds the outer peripheral wall of the impeller cup 81 one turn, and a plurality of seal ring grooves 812 are provided at intervals in the axial direction of the impeller cup 81. Alternatively, the inner sidewall of the volute 82 where it mates with the impeller cup 81 is provided with a plurality of seal ring grooves 812. A seal ring groove 812 is radially recessed along and surrounds the inner sidewall of the volute housing 82 one turn, and a plurality of seal ring grooves 812 are provided at intervals in the axial direction of the volute housing 82.

The plurality of seal ring grooves 812 form a multi-stage labyrinth seal, which performs a sealing function. Specifically, the high-pressure steam at the outlet of the impeller 84 passes through the plurality of seal ring grooves 812, and then is reduced in pressure and is not prone to outward leakage.

As shown in fig. 1, the vapor compressor 8 also includes a seal 88. A seal 88 is provided between the fixing ring 811 of the impeller cup 81 and the fixing end surface of the scroll 82. The sealing member 88 may be a sealing ring or a gasket. When the seal 88 is a seal ring, as shown in FIG. 1, the inner ring at the fixed end face of the volute 82 is recessed inwardly from the fixed end face to form a ring groove in which the seal ring is disposed. The sealing element 88 forms a double seal with the plurality of sealing ring grooves 812, further effectively preventing the transported steam medium from leaking out. In addition, after the impeller cover 81 is installed in place, the gap between the impeller 84 and the inner peripheral wall of the impeller cover 81 can be adjusted by changing the thickness of the seal 88, specifically, a small gap Δ δ is formed between the inner peripheral wall of the impeller cover 81 and the impeller 84, and if Δ δ is larger than a design value, Δ δ can be adjusted by reducing the thickness of the seal 88 to meet the requirement.

As shown in fig. 1. The vapor compressor 8 also includes a dust cover 89. The dust cap 89 is sleeved on the middle portion of the mounting shaft 71 and is disposed on the rear end face of the sealing cavity. The provision of the dust cap 89 can prevent foreign matter such as dust from entering the seal member 87 and damaging the seal member 87.

Further, the vapor compressor 8 further includes a seal ring. As shown in fig. 5, the end of the boss 86 adjacent the impeller 84 is provided with a ring of seal grooves 861 recessed inwardly from the end face, and a seal ring is disposed in the seal grooves 861. In practice, due to the arrangement of the sealing ring, after the impeller 84 is installed in place, the hub section of the impeller 84 presses the end surface of the shaft sleeve 86 close to one end of the impeller 84 to form a seal, so that the conveyed steam medium can be prevented from contacting the mounting shaft 71, and the mounting shaft 71 can be ensured not to be corroded by the conveyed steam medium.

As shown in fig. 3, the impeller cup 81 further includes a plurality of ribs 813. A plurality of ribs 813 are provided in the outer space of the inlet section of the impeller cup 81 and are arranged in an annular array around the axis of the impeller cup 81. The provision of the plurality of ribs 813 can improve the structural strength of the impeller cup 81.

In practice, the steam enters the impeller 84 from the inlet section of the impeller housing 81, works by the high-speed rotation of the impeller 84, flows out of the impeller 84, enters the diffuser vane 83, then enters the volute 82, and is converted into high-temperature and high-pressure steam.

Referring to fig. 6, the testing apparatus for the vapor compressor 8 includes a motor 1, a first coupling 2, a fluid coupling 3, a second coupling 4, a torque and rotation speed sensor 5, a third coupling 6, a step-up gear box 7, and the vapor compressor 8. Two ends of the first coupler 2 are respectively connected with the output end of the motor 1 and the input end of the fluid coupling 3. Two ends of the second coupler 4 are respectively connected with the output end of the fluid coupling 3 and the input end of the torque and rotation speed sensor 5. Two ends of the third coupling 6 are respectively connected with the output end of the torque and rotation speed sensor 5 and the input end of the speed-up gear box 7. The mounting shaft 71 of the speed increasing gear box 7 is connected to the vapor compressor 8. As shown in fig. 1, the vapor compressor 8 of the embodiment of the present application further includes a connection plate 811, and the vapor compressor 8 and the speed increasing gear box 7 are connected by the connection plate 811. The first coupler 2, the second coupler 4 and the third coupler 6 can all adopt diaphragm couplers.

In practice, when there is no hydraulic coupler, the motor 1 drives the low-speed shaft of the step-up gear box 7 to rotate, the large gear of the low-speed shaft drives the small gear of the high-speed shaft to rotate, and the impeller 84 of the vapor compressor 8 is installed on the high-speed shaft of the gear box, so that the impeller 84 of the vapor compressor 8 obtains a high rotation speed. The working speed of the existing steam compressor 8 is mostly tens of thousands of revolutions per minute, and the starting process needs to be gradually increased from a low speed so as to ensure the safe operation of the steam compressor 8. The existing testing device for the steam compressor 8 can only adjust the rotating speed of the motor 1 through the frequency converter to achieve the purpose that the high-speed compressor is gradually accelerated and started from a low-speed state, but the high-voltage frequency converter is expensive, and the testing cost is greatly increased. The test device for steam compressor 8 that this application embodiment provided, connect fluid coupling 3 behind motor 1, during the experiment, the output rotational speed of motor 1 is changed through fluid coupling 3's speed governing ratio, the realization reduces the rotational speed of motor 1 output, later through adjusting fluid coupling 3 progressively rising rotational speed, make steam compressor 8 can start gradually under the low-speed state and accelerate, treat low-speed operation stable back, further adjust fluid coupling 3, change the output rotational speed of motor 1, make steam compressor 8 accelerate gradually, finally reach operating speed. Through the test device that this application embodiment provided, effectively solved the rotational speed that can't adjust vapor compressor 8 under the condition that does not have the high-voltage inverter, and adjust the 8 rotational speeds of vapor compressor through the high-voltage inverter and lead to the problem that the running cost is high, greatly reduced the testing cost, the simple integration of system simultaneously, operation easy maintenance.

Alternatively, the impeller 84 is connected to the gear box mounting shaft 71 by a conical interference fit. The conical interference fit enables the impeller 84 to be more securely fixed to the mounting shaft 71.

As shown in fig. 1, the vapor compressor 8 further includes a lockbolt 810. The front end of the lock nut 85 is provided with a threaded through hole. As shown in fig. 4, the stub shaft 711 of the mounting shaft 71 is provided with a threaded blind hole 713 recessed inward along the front end surface, the front end of the shank 712 of the mounting shaft 71 is provided with a radial oil return through hole 715, and an axial communication hole 714 is provided from the bottom of the threaded blind hole 713 to the middle of the oil return through hole 715. The outer circumferential wall of the shaft 712 is provided with a spiral oil groove 716 and the spiral oil groove 716 is communicated with the oil return through hole 715. When the locking nut 85 is sleeved on the mounting shaft 71, the locking bolt 810 can be screwed into the threaded through hole and the threaded blind hole 713. In practice, when the impeller 84 is installed, hydraulic oil is pressed into the installation shaft 71 through the threaded blind hole 713, the hydraulic oil flows into the axial communication hole 714 and the oil return through hole 715 and then flows into the conical matching surface, and because the outer peripheral wall of the shaft 712 is provided with the spiral oil groove 716, the high-pressure hydraulic oil expands the hub of the impeller 84, and meanwhile, the hydraulic oil is uniformly distributed on the conical surface, so that the conical surface of the hub inner hole of the impeller 84 is uniformly stressed, and the installation of the impeller 84 is facilitated. After the impeller 84 is installed in place, the locking nut 85 fixes the impeller 84 on the mounting shaft 71, the locking bolt 810 is screwed into the threaded through hole and the threaded blind hole 713, the nut of the impeller 84 can be prevented from loosening, and the threaded blind hole 713 plays a role of 'one hole for two purposes'. And finally, after the right end face of the hub of the impeller 84 is ensured to be tightly pressed with the sealing ring on the end face of the shaft sleeve 86, the pressure of the hydraulic oil is gradually released.

Further, as shown in fig. 6, the test rig for a vapour compressor 8 also comprises an integrated base 9. The motor 1, the fluid coupling 3, the torque and rotation speed sensor 5 and the speed increasing gear box 7 are all arranged on the integrated base 9, so that the components are more stable and can stably operate.

The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure.

Claims (10)

1. A vapor compressor is characterized by comprising an impeller cover, a volute, a diffusion guide vane, an impeller, a locking nut, a shaft sleeve and a sealing component;

one end of the mounting shaft is sleeved with the impeller and the impeller is fixed at the end by the locking nut;

a shaft sleeve is sleeved on the mounting shaft positioned on the back of the impeller, the volute is sleeved on the outer side of the shaft sleeve, and the sealing component is clamped in a sealing cavity between the volute and the shaft sleeve;

one end of the mounting shaft, which is provided with the impeller, extends into an inner cavity of the impeller cover, and a fixing ring of the impeller cover is fixed with a fixing end face of the volute;

a plurality of diffuser vanes are arranged on the end face, close to the volute, of the impeller cover, and are annularly arrayed around the axis of the impeller cover and integrally formed with the impeller cover;

or the volute is close to the inner end face of the impeller cover, a plurality of diffuser guide vanes are arranged on the inner end face of the volute, and the diffuser guide vanes surround the axial line annular array of the volute and are integrally formed with the volute.

2. The vapor compressor of claim 1, wherein the peripheral wall of the impeller shroud where it engages the volute is provided with a plurality of sealing ring grooves;

the sealing ring grooves are radially recessed along the peripheral wall of the impeller cover and surround the peripheral wall of the impeller cover for a circle, and the sealing ring grooves are arranged at intervals along the axial direction of the impeller cover;

or a plurality of sealing ring grooves are formed in the inner side wall of the volute, which is matched with the impeller cover;

the seal ring groove is followed the radial recess duplex winding of the inside wall of spiral case the inside wall round of spiral case, and it is a plurality of the seal ring groove is followed the axial interval of spiral case sets up.

3. The vapor compressor of claim 1 or 2, further comprising a seal;

the sealing piece is arranged between the fixing ring of the impeller cover and the fixing end face of the volute.

4. The vapor compressor of claim 1, further comprising a dust cover;

the dustproof cover is sleeved on the middle of the mounting shaft and arranged on the rear end face of the sealing cavity.

5. The vapor compressor of claim 1, further comprising a seal ring;

one end of the shaft sleeve, which is close to the impeller, is provided with a circle of sealing groove which is recessed inwards from the end surface, and the sealing ring is arranged in the sealing groove.

6. The vapor compressor of claim 1, wherein the impeller shroud further comprises a plurality of ribs;

the reinforcing ribs are arranged in the space outside the inlet section of the impeller casing and are annularly arrayed around the axis of the impeller casing.

7. A test device for a steam compressor is characterized by comprising a motor, a first coupler, a fluid coupling, a second coupler, a torque and rotation speed sensor, a third coupler, a speed-increasing gear box and the steam compressor as claimed in any one of claims 1 to 6;

two ends of the first coupler are respectively connected with the output end of the motor and the input end of the hydraulic coupler;

two ends of the second coupling are respectively connected with the output end of the hydraulic coupler and the input end of the torque and rotation speed sensor;

two ends of the third coupler are respectively connected with the output end of the torque and rotation speed sensor and the input end of the speed-up gear box;

and the mounting shaft of the speed increasing gear box is connected with the steam compressor.

8. The testing device for the steam compressor as claimed in claim 7, wherein the impeller is connected with the mounting shaft of the gear box by means of conical interference fit.

9. Test rig for a vapour compressor according to claim 7 or 8, characterised in that the vapour compressor further comprises a locking bolt;

the front end of the locking nut is provided with a threaded through hole;

the shaft head of the mounting shaft is provided with a threaded blind hole which is recessed inwards along the front end face, the front end of the shaft lever of the mounting shaft is provided with a radial oil return through hole, and an axial communication hole is formed from the bottom of the threaded blind hole to the middle of the oil return through hole; the outer peripheral wall of the shaft rod is provided with a spiral oil groove which is communicated with the oil return through hole;

when the locking nut is sleeved on the mounting shaft, the locking bolt can be screwed into the threaded through hole and the threaded blind hole.

10. The test rig for a vapor compressor of claim 7, further comprising an integrated base;

the motor, the hydraulic coupler, the torque and rotating speed sensor and the speed-up gear box are all arranged on the integrated base.

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