CN108474376B - Screw compressor and heat pump assembly - Google Patents

Abstract

Screw compressor of the invention has: fixed eddy plate, the fixed eddy plate has the fixed scroll tooth of scroll in bottom plate, it is combined with the swing scrollwork tooth that pendulum movable orbiting scroll has and forms discharge chambe, there is the injection flow path for being connected to discharge chambe and the refrigerant flowed into from outside being supplied to pass through in the inside of bottom plate；Check-valves, the check-valves are set in injection flow path, and refrigerant is avoided to flow from discharge chambe into injection flow path；And cover, the processing hole that injection flow path is connected to by the cover occlusion with the outer surface of bottom plate become the valve seat of check-valves.

Description

Screw compressor and heat pump assembly

Technical field

The present invention relates to screw compressors etc..More particularly to the injection structure in screw compressor.

Background technique

Previous screw compressor is accommodated with scroll compression members and driving mechanism in closed container.Scroll compression members Surface vertical in end plate is provided with the fixed eddy plate of the roll bending of scroll and engages and is holding with the fixed eddy plate The surface vertical of plate is provided with the pendulum movable orbiting scroll of the roll bending of scroll.Also, screw compressor makes to swing whirlpool by driving mechanism Disk revolves relative to fixed eddy plate, makes the multiple spaces as discharge chambe formed by pendulum movable orbiting scroll and fixed eddy plate from outer Side is gradually reduced towards inside, is thus compressed.In such previous screw compressor, formed stressed for applying Back pressure access and the liquid injection access being connected to spray-hole, and plugged in the inside for the connecting tube being connect with liquid injection access There is smaller volume component (for example, referring to patent document 1).

In addition, for example, carrying out gas injection sometimes through jet port in other screw compressors.In the system of injection The flow path of cryogen is provided with check-valves.In such screw compressor, fixed eddy plate end plate be equipped with from the back side penetrate through to The jet port of discharge chambe is formed with only in the interconnecting piece of the jet port and the injection pipe for being connected to jet port of the end plate of fixed eddy plate Return valve chamber.Check-valves is equipped in the check valve chamber.Moreover, screw compressor, which has, is embedded into inserting in the end plate of fixed eddy plate Head.Flange part around intercalation part is fixed on the back side of fixed eddy plate via sealing element.Here, check-valves is to be close to plug The end face in portion is closed and by base portion and back with the introducing port that will pass through the front end injection pipe of comfortable end face opening in the future The leaf valve that check-valves stopper is installed together (for example, referring to patent document 2).

Citation

Patent document

Patent document 1: No. 4651567 bulletins of Japanese Patent No.

Patent document 2: Japanese Unexamined Patent Publication 11-107949 bulletin

Summary of the invention

Subject to be solved by the invention

For example, being needed to form spray-hole in the screw compressor shown in patent document 1 by fixed eddy plate end plate Most of covering at the back side.Accordingly, it is difficult to inhibit cost.And, it is difficult to ensure for being provided as the space of the cover of lid.

In addition, for example, in the screw compressor shown in patent document 2, it is difficult to ensure check-valves plug and check-valves The space of room setting.In addition, in the case where leaf valve is used for check-valves, need check-valves stopper through bolt and The base portion of leaf valve is fixed, it is therefore desirable to further ensure that space.

The present invention makes to solve project as described above, and its object is to obtain can be realized miniaturization and cost The screw compressor etc. of inhibition.

Solution for solving the problem

Screw compressor of the invention has: fixed eddy plate, and the fixed eddy plate has the fixation whirlpool of scroll in bottom plate Tooth is rolled up, combined with the swing scrollwork tooth that pendulum movable orbiting scroll has and forms discharge chambe, has in the inside of bottom plate and is connected to discharge chambe And the injection flow path for supplying the refrigerant flowed into from outside to pass through；Check-valves, the check-valves are set in injection flow path, avoid making Cryogen is flowed from discharge chambe into injection flow path；And cover, it is described cover occlusion will spray flow path be connected to the outer surface of bottom plate add Work hole becomes the valve seat of check-valves.

Invention effect

Screw compressor according to the present invention, in the case where being sprayed, by the flowing of refrigerant, check-valves is beaten It opens, refrigerant can be made to be flowed into the discharge chambe of compression midway via injection flow path, therefore can ensure refrigerant flow.Separately On the one hand, when not sprayed, check-valves is blocked for, and thus the refrigerant of compression midway, can not to injection flow path Mitigate since the refrigerant being trapped in injection flow path again returns to the recompression generated in discharge chambe loss.Moreover, fixed The bottom plate of whirlpool disk inside have injection flow path, therefore can reduce injection flow path needed for space.Moreover, because can reduce Number of components etc., therefore can be realized miniaturization and cost inhibition.

Detailed description of the invention

Fig. 1 is the longitudinal sectional view for indicating the internal structure of screw compressor 100 of embodiments of the present invention 1.

Fig. 2 is the figure for illustrating the injection structure portion 50 of screw compressor 100 of embodiments of the present invention 1.

Fig. 3 is to indicate the first cover 50j of setting and the second cover 50k in the screw compressor 100 of embodiments of the present invention 1 The figure in injection structure portion 50 before.

Fig. 4 is an example for indicating to have the structure of the heat pump assembly of screw compressor 100 of embodiments of the present invention 1 Figure.

Fig. 5 is when indicating the heating operation in the heat pump assembly for the screw compressor 100 for having embodiments of the present invention 1 Refrigerant state mollier diagram.

Fig. 6 is when indicating the refrigeration operation in the heat pump assembly for the screw compressor 100 for having embodiments of the present invention 1 Refrigerant state mollier diagram.

Fig. 7 is the phase by the pendulum movable orbiting scroll 2 of the screw compressor 100 of embodiments of the present invention 1 relative to fixed eddy plate 1 To position to suck the time point of completion status as 0 degree, every 90 degree of ground indicates the figure until 450 degree.

Fig. 8 is the injection structure portion 50 illustrated when being sprayed in the screw compressor 100 of embodiments of the present invention 1 The figure of the flowing of neighbouring refrigerant etc..

Fig. 9 is the injection structure portion illustrated when not sprayed in the screw compressor 100 of embodiments of the present invention 1 The figure of the flowing of refrigerant near 50 etc..

Figure 10 is the figure for illustrating the injection structure portion 50 of screw compressor 100 of embodiments of the present invention 2.

Figure 11 is the figure for illustrating the injection structure portion 50 of screw compressor 100 of embodiments of the present invention 4.

Figure 12 is to indicate the cover 50k of the first cover 50j and second to the figure for removing the case where direction moves.

Figure 13 is another figure for illustrating the injection structure portion 50 of the screw compressor 100 of embodiments of the present invention 4.

Figure 14 is the figure for illustrating the injection structure portion 50 of screw compressor 100 of embodiments of the present invention 5.

Figure 15 is another figure for illustrating the injection structure portion 50 of the screw compressor 100 of embodiments of the present invention 5.

Specific embodiment

Hereinafter, illustrating mode for carrying out the present invention referring to attached drawing.Here, in the attached drawing below including Fig. 1 In, the structure for marking same appended drawing reference is the same or equivalent structure in this, in the full text of the embodiment of following record It is general.Also, the mode for the composition element that specification full text indicates only illustrates, and is not limited to the side of specification record Formula.The combination for especially constituting element not shall be limited only to the extent the combination of each embodiment, other embodiments can be recorded Composition element be applied to other embodiment.In addition, about the multiple equipment etc. of the same race distinguished with subscript etc., It does not need in the case where distinguishing especially or determining, omits subscript sometimes and recorded.Moreover, in the accompanying drawings, each structural elements Size relation is sometimes different from actual conditions.It is not with the pass with absolute value also, about the height of temperature, pressure etc. System is high low especially to determine, but relatively determined in the state of system, device etc., movement etc..Moreover, in scheme Top is "upper", is illustrated by "lower" of lower section.Also, in the accompanying drawings, the size relation of each structural elements sometimes with reality The case where it is different.

Embodiment 1.

Fig. 1 is the longitudinal sectional view for indicating the internal structure of screw compressor 100 of embodiments of the present invention 1.As after Described in text, the screw compressor 100 of embodiment 1 is the screw compressor with injection equipment.

Firstly, illustrating the structure of the screw compressor 100 of embodiment 1.As shown in Figure 1, the scroll compression of embodiment 1 Machine 100 by fixed eddy plate 1, pendulum movable orbiting scroll 2, flexible frame 3, guiding frame 4, motor 5, sub-frame 6, main shaft 7, Euclidean mechanism 8 are accommodated in closed container 10.

The peripheral part of fixed eddy plate 1 is fastened by bolt, is fixed on guiding frame 4.In the base plate 1a of fixed eddy plate 1 A surface side (downside of Fig. 1) be formed with the scrollwork tooth 1b (fixed scroll tooth) of plate.The scrollwork tooth 1b of fixed eddy plate 1 with it is aftermentioned Pendulum movable orbiting scroll 2 scrollwork tooth 2b (swing scrollwork tooth) engagement, the space as discharge chambe 20 is consequently formed.

Peripheral part in a surface side (downside of Fig. 1) of base plate 1a, Euclidean guiding groove 1c form 2 on substantially one straight line It is a.The pawl 8a of Euclidean mechanism 8 reciprocatingly slides is sticked in Euclidean guiding groove 1c freely.

It is formed in a surface side (upside of Fig. 1) of the base plate 2a of pendulum movable orbiting scroll 2 real with the scrollwork tooth 1b of fixed eddy plate 1 It is the scrollwork tooth 2b of the plate of same shape in matter.As described above, the scrollwork of the scrollwork tooth 1b of fixed eddy plate 1 and pendulum movable orbiting scroll 2 Tooth 2b engagement, is consequently formed the space as discharge chambe 20.In the surface side opposite with scrollwork tooth 2b of base plate 2a (under Fig. 1 Side) peripheral part, the Euclidean guiding groove 2e of phase differences with substantially 90 degree between the Euclidean guiding groove 1c of fixed eddy plate 1 exists 2 are formed on substantially one straight line.The pawl 8b of Euclidean mechanism 8 reciprocatingly slides is sticked in Euclidean guiding groove 2e freely.

Central part in the surface side (downside of Fig. 1) opposite with scrollwork tooth 2b of base plate 2a is formed with hollow cylindrical Boss portion 2f.Also, the inside of boss portion 2f becomes oscillation bearing 2c.The swing axle portion 7b of the upper end of main shaft 7 is sticked in swing Bearing 2c.

The thrust bearing 3a of flexible frame 3 is formed in the outside diameter of boss portion 2f and can crimp the thrust face of sliding 2d.Here, it is formed with space between the thrust face 2d and flexible frame 3 of pendulum movable orbiting scroll 2 in the outside diameter of boss portion 2f, with Under, which is known as boss portion outer diameter space 2g.

In the outside diameter of thrust bearing 3a, it is formed with space between the base plate 2a and flexible frame 3 of pendulum movable orbiting scroll 2, The space is known as bottom plate outer diameter part space 2h.Bottom plate outer diameter part space 2h becomes the low pressure of sucking gas atmosphere pressure (sucking pressure) Space.

The face from the perforation of the face (face of the upside of Fig. 1) of 1 side of fixed eddy plate to 3 side of flexible frame is equipped in base plate 2a The aspirating hole 2j in (face of the downside of Fig. 1).Discharge chambe 20 is connected to by aspirating hole 2j with the space of the side thrust face 2d.

Using the upper chimeric barrel surface 4a and lower chimeric barrel surface 4b of the inner peripheral portion setting in guiding frame 4, along radius side To the 2 upper chimeric barrel surface 3d and lower chimeric barrel surface 3e up and down of bearing flexible frame 3 being arranged in peripheral part.Moreover, It is formed with base bearing 3c in the central part of flexible frame 3, base bearing 3c will be driven by motor 5 and the main shaft 7 that rotates is along half The bearing of diameter direction.Here, being formed through cricoid upper seal 16a and lower sealing between guiding frame 4 and flexible frame 3 Part 16b is divided into upper and lower space, hereinafter, the space is known as frame space 4c.Moreover, in the embodiment 1, in lead-frame The inner peripheral surface of frame 4 is formed with the cricoid seal groove for storing upper seal 16a and lower seal 16b respectively at 2.However, closing In the forming position of seal groove, for example, it is also possible to be formed in the outer peripheral surface of flexible frame 3.

Intercommunicating pore 3f is formed in the position opposite with the under shed portion of aspirating hole 2j of flexible frame 3.Intercommunicating pore 3f from The side thrust bearing 3a is penetrated through to the side frame space 4c, always or is intermittently connected to aspirating hole 2j with frame space 4c.Moreover, soft Property frame 3 have adjustment valve space 3n, adjustment valve space 3n be accommodated with adjustment boss portion outer diameter space 2g pressure centre Pressure adjustment valve 3g, valve pressing piece 3h and intermediate pressure adjust spring 3k.Intermediate pressure adjusts shape of the spring 3k to shrink from natural length State is accommodated in adjustment valve space 3n.Here, by the outside diameter of intermediate pressure adjustment valve 3g, between flexible frame 3 and guiding frame 4 Space be known as valve outer diameter space 3p.

Upper chimeric barrel surface 4a is formed in 1 side of fixed eddy plate (upside of Fig. 1) of the medial surface of guiding frame 4.It is upper embedding Barrel surface 4a is closed to engage with the upper chimeric barrel surface 3d of the outer peripheral surface formation in flexible frame 3.Moreover, in guiding frame 4 5 side of motor (downside of Fig. 1) of side is formed with lower chimeric barrel surface 4b.Down chimeric barrel surface 4b in flexible frame 3 The lower chimeric barrel surface 3e engaging that outer peripheral surface is formed.

It is formed in 2 side of pendulum movable orbiting scroll (upside of Fig. 1) of main shaft 7 and is rotated freely with the oscillation bearing 2c of pendulum movable orbiting scroll 2 The swing axle portion 7b of ground engaging.Rotatably freely block swinging to be formed on the downside of axle portion 7b with the base bearing 3c of flexible frame 3 The main shaft part 7c of conjunction.

The supplementary bearing 6a with sub-frame 6 is formed in the side (downside of Fig. 1) opposite with pendulum 2 side of movable orbiting scroll of main shaft 7 The countershaft portion 7d rotatably freely engaged.Heat is furnished with the rotor 5a of motor 5 between countershaft portion 7d and above-mentioned main shaft part 7c, Stator 5b is equipped with around it.Moreover, being equipped in the inside of main shaft 7 along the high pressure oil oil supplying hole 7e axially through setting.

Fig. 2 is the figure for illustrating the injection structure portion 50 of screw compressor 100 of embodiments of the present invention 1.Embodiment 1 Screw compressor 100 be to flow into refrigerant externally to the refrigerant of the compression midway in discharge chambe 20 and be able to carry out spray The compressor penetrated.The flow path etc. for relating to injection is formed in injection structure portion 50.

The substantially central portion of base plate 1a possessed by fixed eddy plate 1 is equipped with outlet 1d to perforation base plate 1a.And And the injection pipe 41 for becoming refrigerant inflow port penetrates through closed container 10, in the side of base plate 1a, and is formed in base plate 1a Interior injection first flow path 50a connection.Spraying first flow path 50a is the initial flow path flowed into from the refrigerant of outer jet. Injection first flow path 50a is formed and being opened up the processing as the hole of flow path from the side of base plate 1a.

Fig. 3 is to indicate the first cover 50j of setting and the second cover 50k in the screw compressor 100 of embodiments of the present invention 1 The figure in injection structure portion 50 before.Moreover, base plate 1a has the injection second flow path being connected to injection first flow path 50a 50b and the check-valves that check-valves 50h is stored in the flow path of refrigerant store road 50f.It sprays second flow path 50b and check-valves is received The road 50f that receives is opened up the processing in the hole as flow path by the face (upside of Fig. 3) of the opposite side of the one side from base plate 1a And it is formed.In processing, the first bigger processing hole 50d of open area ratio check-valves storage road 50f is formed.

In addition, base plate 1a has the injection third flow path 50c being connected to check-valves storage road 50f.Spray third flow path 50c is formed and being opened up the processing as the hole of flow path from the side of base plate 1a.Also, base plate 1a has and will spray Penetrate the injection access 50g that third flow path 50c is connected to discharge chambe 20.Access 50g is sprayed with from a surface side of base plate 1a (downside of Fig. 1) opens up hole and the mode for penetrating through injection third flow path 50c with discharge chambe 20 is formed.Here, will be based on solid Injection first flow path 50a, injection second flow path 50b, the check-valves storage road 50f, injection formed in the base plate 1a of static vortex disk 1 Third flow path 50c and the flow path for spraying access 50g are known as spraying flow path.

As previously mentioned, check-valves 50h is set to check-valves storage road 50f.Check-valves 50h can store road along check-valves It is mobile that 50f is opened and closed direction (up and down direction of Fig. 2).Check-valves 50h makes to store road from the injection side second flow path 50b to check-valves It is that 50f is flowed into, pass through from the refrigerant of outer jet to the injection side third flow path 50c.It will be from the injection side third flow path 50c to only The refrigerant partition that valve storage road 50f is flowed into is returned, is passed through to avoid it to the injection side second flow path 50b.

First cover 50j becomes the lid for covering the first processing hole 50d for example with elasticity, to avoid check-valves storage The mode that road 50f is connected to the closed container 10 as high-pressure atmosphere separates space.Especially in the scroll compression of embodiment 1 In contracting machine 100, the first cover 50j becomes the seat surface of taking a seat of the valve seat in check-valves 50h.Second cover 50k becomes for example with elasticity By the lid of the second processing hole 50e covering generated when being formed and spraying third flow path 50c, to avoid injection third flow path 50c The mode being connected to closed container 10 separates space.

Next, illustrating the movement of the screw compressor 100 of embodiment 1.It is electronic by the power supply from outside Machine 5 is driven, and main shaft 7 rotates.By the rotation of main shaft 7, the pendulum movable orbiting scroll 2 for being fixed on main shaft 7 is driven.Put movable orbiting scroll 2 carry out revolution motion (eccentric circumnutation) without spinning motion, to carry out making discharge chambe 20 by Euclidean mechanism 8 The compressed action that volume gradually decreases.The refrigerant in discharge chambe 20 sucked by the compressed action becomes high pressure, from admittedly The outlet 1d of static vortex disk 1 is discharged into closed container 10.The refrigerant of discharge is released from discharge pipe 12 to outside closed container 10. Therefore, the refrigerant atmosphere in closed container 10 becomes high pressure.

In usual operating, becomes high pressure in closed container 10, lodge in the refrigerator of the bottom of closed container 10 as a result, Oil 11 is in high pressure oil oil supplying hole 7e towards pendulum 2 side of movable orbiting scroll (upside of Fig. 1) flowing.Then, 11 quilt of refrigerator oil of high pressure Guidance is decompressed to and discharge higher than sucking pressure and presses intermediate pressure Pm1 below, flow to boss portion outer diameter space 2g to oscillation bearing 2c It is dynamic.

In boss portion outer diameter space 2g as the refrigerator oil 11 of intermediate pressure Pm1 by adjusting valve space 3n to valve outer diameter Space 3p flowing.The refrigerator oil 11 for flowing to valve outer diameter space 3p passes through inboard row of the intercommunicating pore 3f to Euclidean mechanism annulus 8c Out.Here, refrigerator oil 11 when by adjusting valve space 3n, overcomes the power applied by intermediate pressure adjustment spring 3k, it will be intermediate Pressure adjustment valve 3g has been pressed and has been flowed to valve outer diameter space 3p.Moreover, as the cold of intermediate pressure Pm1 in boss portion outer diameter space 2g Freeze machine oil 11 to supply to the sliding part of the thrust face 2d of pendulum movable orbiting scroll 2 and the thrust bearing 3a of flexible frame 3, to Euclidean mechanism ring The inside of shape portion 8c is discharged.Also, the refrigerator oil 11 for being discharged to the inside of Euclidean mechanism annulus 8c is cyclic annular to Euclidean mechanism The supply of the sliding surface of the sliding surface of portion 8c and the pawl 8a of Euclidean mechanism 8 and pawl 8b.

Here, the intermediate pressure Pm1 of boss portion outer diameter space 2g by by intermediate pressure adjust spring 3k spring force and centre The defined pressure alpha pressing the exposing area of adjustment valve 3g and substantially determining, can be expressed as " Pm1=Ps+ α ".Here, Ps is into For the low pressure for sucking atmosphere pressure.

In addition, the under shed portion of aspirating hole 2j and the side thrust bearing 3a for the intercommunicating pore 3f for being set to flexible frame 3 are opened Oral area is connected to always or intermittently.Therefore, the refrigerant gas of the compression midway from discharge chambe 20 is via the pumping for putting movable orbiting scroll 2 The intercommunicating pore 3f of stomata 2j and flexible frame 3 is directed to frame space 4c.The refrigerant gas be compression midway, therefore become than Sucking pressure height and discharge pressure intermediate pressure Pm2 below.Though it should be noted that being guidance refrigerant gas, frame space 4c be also by upper seal 16a and lower seal 16b it is closed close space.Therefore, the pressure in usual operating, with discharge chambe 20 In concert with, discharge chambe 20 and frame space 4c have small flowing along twocouese to variation.

Here, as defined in the intermediate pressure Pm2 of frame space 4c substantially determined by the position by the discharge chambe 20 being connected to Multiplying power β can be expressed as " Pm2=Ps × β ".Ps is low pressure as previously described.

It (A) is the power of cause and (B) via the pressing force for carrying out self-swinging whirlpool disk 2 of thrust bearing 3a using intermediate pressure Pm1 Total (A+B) plays a role as downward power.On the other hand, (C) using the intermediate pressure Pm2 of frame space 4c as the power of cause with It (D) is total (C+D) of the power of cause as upwards using the high pressure on the part exposed to high-pressure atmosphere for acting on lower end surface Power and act on flexible frame 3.Also, in usual operating, upward power (C+D) is set greater than downward power (A+B).

In usual operating, upward power (C+D) is set greater than downward power (A+B).Therefore, flexible frame 3 becomes The state to float to 1 side of fixed eddy plate (on the upside of Fig. 1).Therefore, in flexible frame 3, upper chimeric barrel surface 3d is by guiding frame 4 Upper chimeric barrel surface 4a guidance, and lower chimeric barrel surface 3e is guided by the lower chimeric barrel surface 4b of guiding frame 4, from forming For the state to float to 1 side of fixed eddy plate (upside of Fig. 1).It is pressed in moreover, flexible frame 3 becomes via thrust bearing 3a Put the state of movable orbiting scroll 2.

Due to flexible frame 3 be pressed in pendulum movable orbiting scroll 2, pendulum movable orbiting scroll 2 also in the same manner as flexible frame 3 become to The state that 1 side of fixed eddy plate (upside of Fig. 1) is floated.As a result, the tooth top and fixed eddy plate of the scrollwork tooth 2b of pendulum movable orbiting scroll 2 1 bottom of the tooth (base plate 1a) contact, and the bottom of the tooth (base plate of the tooth top of the scrollwork tooth 1b of fixed eddy plate 1 and pendulum movable orbiting scroll 2 2a) contact.

On the other hand, the transitional periods such as in the starting of screw compressor 100, rise extremely in the internal pressure of discharge chambe 20 etc. When, above-mentioned (B's) increases via the pressing force for carrying out self-swinging whirlpool disk 2 of thrust bearing 3a.Therefore, downward power (A+B) is big In upward power (C+D).As a result, flexible frame 3 is compressed to 4 side of guiding frame (downside of Fig. 1).Also, swing whirlpool The tooth top of scrollwork tooth 2b of disk 2 is separated with the bottom of the tooth (base plate 1a) of fixed eddy plate 1, and the scrollwork tooth 1b of fixed eddy plate 1 Tooth top is separated with the bottom of the tooth (base plate 2a) of pendulum movable orbiting scroll 2.Pressure decline in discharge chambe 20 as a result, can prevent discharge chambe Pressure in 20 excessively rises.

Fig. 4 is an example for indicating to have the structure of the heat pump assembly of screw compressor 100 of embodiments of the present invention 1 Figure.The heat pump assembly (freezing cycle device) of embodiment 1 can be suitable for such as conditioner, hot-water supply, cold Freeze device, cold storage plant etc..In the heat pump assembly of Fig. 4, by screw compressor 100, four-way valve 58, load-side heat exchanger 52, the first expansion valve 53, inner heat exchanger 54, third expansion valve 55, heat source side heat exchanger 57 carry out piping connection, constitute Main refrigerant circuit (major loop).

For the piping connection relationship in refrigerant circuit, four-way valve 58 can exchange the suction side of screw compressor 100 With discharge side, such as the loop direction of switching heating operation and the refrigerant in refrigeration operation.Here, heating operation not only includes The heating of air conditioning, and the operating including the supplying hot water of hot water is heated and be formed as to water are carried out to interior etc.. It is also the same about refrigeration operation.Load-side heat exchanger 52 carries out the heat load such as the air of air conditioning object and system The heat exchange of cryogen.For example, functioning in heating operation as condenser, refrigerant is made to condense and liquefy.Moreover, making It is functioned when blowdown firing as evaporator, makes refrigerant evaporation, gasification.The control of first expansion valve such as throttling set 53 is loading The flow and pressure of the refrigerant passed through in side heat exchanger 52.Liquid storage device 59 accumulates the remaining refrigeration in such as refrigerant circuit Agent.

Inner heat exchanger 54 carries out the refrigerant flowed in main refrigerant circuit and flows to the system of bypass flow path The heat exchange of cryogen.Moreover, third expansion valve 55, for example in heating operation, control exists and depressurize etc. to refrigerant The flow and pressure of the refrigerant passed through in heat source side heat exchanger 57.Heat source side heat exchanger 57 for example carries out refrigerant and sky The heat exchange of gas (outdoor air).For example, functioning in heating operation as evaporator, make refrigerant evaporation, gasification. Moreover, functioning in refrigeration operation as condenser, refrigerant is made to condense and liquefy.

In addition, the heat pump assembly of Fig. 4 has bypass flow path.Bypass flow path is the one of the refrigerant for making to flow in major loop Part passes through, and makes sucking of the refrigerant via injection pipe 41 to the inflow of discharge chambe 20 of compression midway or to screw compressor 100 The flow path of 13 side of pipe flowing.Bypass flow path is provided with the second expansion valve 56.The control of second expansion valve 56 is flowed in bypass flow path Dynamic refrigeration dose.Second expansion valve 56 of embodiment 1 is for example by control device control aperture (not shown).Moreover, bypass Flow path is branched off into the piping connecting with injection pipe 41 and the piping with the piping connection of the refrigerant flowing flowed into liquid storage device 59. The piping connecting with injection pipe 41 is provided with open and close valve 60.Moreover, matching what is flowed with the refrigerant flowed into liquid storage device 59 The piping of pipe connection is provided with the 4th expansion valve 61.

Fig. 5 is when indicating the heating operation in the heat pump assembly for the screw compressor 100 for having embodiments of the present invention 1 Refrigerant state mollier diagram.In Fig. 5, horizontal axis indicates specific enthalpy, and the longitudinal axis indicates refrigerant pressure.Next, explanation The movement of heat pump assembly shown in Fig. 4.

Firstly, the case where explanation is sprayed in heating operation to screw compressor 100.For example, to heat pump assembly into The flow path setting of four-way valve 58 is become solid line direction by the control device (not shown) of row control.Moreover, control device will be opened and closed Valve 60 is opened, and refrigerant is avoided to flow to the 4th expansion valve 61.

Screw compressor 100 becomes the vapor phase refrigerant (Fig. 5 (A)) of high temperature and pressure from the discharge of discharge pipe 12.The system of discharge Cryogen carries out heat exchange with heat load in load-side heat exchanger 52 and liquefies (Fig. 5 (B)).At this point, become load air, Water etc. due to refrigerant heat dissipation and be heated, heated, supplying hot water etc..

The refrigerant for the liquid phase being liquefied in load-side heat exchanger 52 is decompressed to intermediate pressure by the first expansion valve 53, at For the refrigerant (Fig. 5 (C)) of gas-liquid two-phase state.By becoming the refrigeration of gas-liquid two-phase state in the first expansion valve 53 Agent carries out heat exchange with the refrigerant sucked to screw compressor 100 in liquid storage device 59, is cooled and liquefies (Fig. 5 (D)).? Internally 54 side of heat exchanger (major loop side) and 56 side of the second expansion valve are (other for the refrigerant for the liquid phase being liquefied in liquid storage device 59 Through-flow trackside) diverted flow.

The refrigerant of the liquid phase flowed in major loop is as described later in inner heat exchanger 54 and by the second expansion valve 56 depressurize and become the refrigerant progress heat exchange of gas-liquid two-phase state flowed in bypass flow path, are further cooled (Fig. 5 (E)).The refrigerant of liquid phase after being cooled in inner heat exchanger 54 is depressurized by third expansion valve 55 and becomes gas-liquid two-phase The refrigerant (Fig. 5 (F)) of state.The refrigerant for becoming gas-liquid two-phase state in third expansion valve 55 is becoming evaporator Heat exchange is carried out in heat source side heat exchanger 57 and is heated (Fig. 5 (G)).Refrigerant after being heated by heat source side heat exchanger 57 (Fig. 5 (H)) is further heated and carrying out heat exchange with the refrigerant in liquid storage device 59.Then, from suction line 13 to whirlpool Compressor 100 is revolved to suck.

On the other hand, the refrigerant flowed in bypass flow path is subtracted by the second expansion valve 56 (mechanism of decompressor) as described above Pressure, becomes the refrigerant (Fig. 5 (I)) of gas-liquid two-phase state, and internally heat exchanger 54 flows into.It is flowed into inner heat exchanger 54 Refrigerant be heated by heat exchange.Here, although the refrigerant passed through in inner heat exchanger 54 is heated still Still it is gas-liquid two-phase state (Fig. 5 (J)).The refrigerant of gas-liquid two-phase state passes through in bypass flow path, from screw compressor 100 Injection pipe 41 flowed into via injection access 50g in fixed eddy plate 1 etc. to discharge chambe 20.

In screw compressor 100, flows in major loop and pressed from the refrigerant (Fig. 5 (H)) that suction line 13 sucks It contracts and is heated to intermediate pressure (Fig. 5 (K)), the details about the compressed action in screw compressor 100 will be described below.It is pressing In contracting room 20, the refrigerant (Fig. 5 (K)) of intermediate pressure and the refrigerant (Fig. 5 flowed into via bypass flow path are compressed and are heated to (H)) collaborate, temperature declines (Fig. 5 (L)).Also, temperature decline after refrigerant (Fig. 5 (L)) further compressed and heat and As the refrigerant of high temperature and pressure, (Fig. 5 (A)) is discharged by screw compressor 100 in the refrigerant of the high temperature and pressure.

For example, outer gas temperature be defined temperature (for example, 2 DEG C) below when, screw compressor 100 is with defined frequency Whens rate (for example, 60Hz) rotates above equal, heating capacity can be improved and being sprayed to screw compressor 100.Here, About whether the benchmark sprayed, it is not limited to above-mentioned situation.

On the other hand, in the case where not needing to be sprayed to screw compressor 100, control device makes the second expansion valve 56 are less than defined aperture, flow to avoid refrigerant to bypass flow path.Moreover, open and close valve 60 is closed.Therefore, refrigerant is not It can wait via injection pipe 41 to discharge chambe 20 and flow into.Also, in load-side heat exchanger 52, the first expansion valve 53, liquid storage device 59 In the refrigerant that passes through all sucked via suction line 13 to screw compressor 100.

Fig. 6 is when indicating the refrigeration operation in the heat pump assembly for the screw compressor 100 for having embodiments of the present invention 1 Refrigerant state mollier diagram.In Fig. 6, horizontal axis indicates specific enthalpy, and the longitudinal axis indicates refrigerant pressure.Next, explanation The movement of heat pump assembly when refrigeration operation.Substantially without the injection to screw compressor 100.Thus, for example, control dress Setting becomes dotted line direction for the flow path setting of four-way valve 58.Moreover, in refrigeration operation, substantially without to screw compressor 100 injection.Therefore, open and close valve 60 is closed.Also, it is swollen to adjust the 4th to carry out the supercooling of the refrigerant in major loop The aperture of swollen valve 61.

Screw compressor 100 becomes the vapor phase refrigerant (Fig. 6 (A)) of high temperature and pressure from the discharge of discharge pipe 12.The system of discharge Cryogen carries out heat exchange with air etc. in the heat source side heat exchanger 57 for becoming condenser and liquefies (Fig. 6 (B)).Here, the The aperture of three expansion valves 55 is set as standard-sized sheet.

In inner heat exchanger 54, the refrigerant of the liquid phase passed through in heat source side heat exchanger 57 is expanded with second The refrigerant (Fig. 6 (I)) for being depressurized in valve 56 and becoming gas-liquid two-phase state carries out heat exchange.At this point, being handed in heat source side heat The refrigerant for the liquid phase being liquefied in parallel operation 57 is over cooled (Fig. 6 (D)).The system of the liquid phase passed through in inner heat exchanger 54 Cryogen (Fig. 6 (D)) is flowed to branch to 59 side of liquid storage device (major loop side) and 56 side of the second expansion valve (bypass flow path side).

The refrigerant of the liquid phase flowed in major loop in liquid storage device 59 with the refrigerant that is sucked to screw compressor 100 Heat exchange is carried out, by further supercooling (Fig. 6 (E)).The refrigerant for the liquid phase being cooled in liquid storage device 59 is in the first expansion The refrigerant (Fig. 6 (F)) of gas-liquid two-phase state is depressurized and become in valve 53.Become gas-liquid two-phase in the first expansion valve 53 The refrigerant of state carries out heat exchange with heat load in the load-side heat exchanger 52 for becoming evaporator and is heated (Fig. 6 (G)).At this point, since refrigerant absorbs heat, it is cooled to become empty gas and water of load etc., is freezed, generates cold water, is ice making, cold Freeze etc..The refrigerant being heated in load-side heat exchanger 52 is and the heat exchange with the refrigerant in liquid storage device 59 into one Step is heated (Fig. 6 (H)).Then, it is sucked from suction line 13 to screw compressor 100.

On the other hand, the refrigerant flowed in bypass flow path is subtracted by the second expansion valve 56 (mechanism of decompressor) as described above Pressure, becomes the refrigerant (Fig. 6 (I)) of gas-liquid two-phase state, and internally heat exchanger 54 flows into.It is flowed into inner heat exchanger 54 Refrigerant (Fig. 6 (J)) is heated by heat exchange.Moreover, depressurizing and becoming the refrigerant of gas phase by the 4th expansion valve 61 (Fig. 6 (G)).Also, collaborate with the refrigerant flowed in major loop and be further heated (Fig. 6 (H)) in liquid storage device 59, It is sucked from suction line 13 to screw compressor 100.

Fig. 7 is the phase by the pendulum movable orbiting scroll 2 of the screw compressor 100 of embodiments of the present invention 1 relative to fixed eddy plate 1 To position to suck the time point of completion status as 0 degree, every 90 degree of ground indicates the figure until 450 degree.Next, illustrating embodiment An example of the compressed action of 1 screw compressor 100.

As previously mentioned, by the scrollwork tooth 1b of fixed eddy plate 1 and put movable orbiting scroll 2 scrollwork tooth 2b engage formation conduct at Pair discharge chambe 20a and discharge chambe 20b space.Here, discharge chambe 20a and discharge chambe 20b are not distinguished and as discharge chambe 20.Discharge chambe 20 is rotated by pendulum movable orbiting scroll 2 along with the rotation of main shaft 7, and volume is gradually reduced and moves to central portion.Cause This, carries out revolution motion along with the rotation of main shaft 7 by pendulum movable orbiting scroll 2, is inhaled into the refrigerant of discharge chambe 20 gradually It is compressed, raising pressure is simultaneously mobile to central portion.Also, when discharge chambe 20 is connected to the outlet 1d for being set to central portion, Compressed refrigerant in discharge chambe 20 is discharged from outlet 1d into closed container 10.

When putting movable orbiting scroll 2 relative to the relative position of fixed eddy plate 1 is 0 degree, as described above, from suction line 13 to compression Room 20 sucks refrigerant, and the sucking of refrigerant is completed, and discharge chambe 20 is by closed state.When main shaft 7 from 0 degree (refrigerant inhale Enter to complete time point) when being rotated by 90 °, the volume of discharge chambe 20 slightly reduces, and discharge chambe 20 is slightly by nearly central portion mobile.And And at this point, discharge chambe 20 is connected to injection access 50g.Therefore, when being sprayed to screw compressor 100, spray has been passed through The refrigerant on jet stream road is flowed into from injection access 50g.Therefore, the refrigerant for having passed through injection flow path is flowed into the gas of intermediate pressure In atmosphere, which is that the sucking pressure for the time point being inhaled into than the sucking refrigerant sucked from suction line 13 to discharge chambe 20 is (low Pressure) the low intermediate pressure of high and the time point than being discharged from outlet 1d discharge pressure (high pressure).

And then lighted when sucking and complete from refrigerant, main shaft 7 rotates 180 degree, 270 degree, 360 degree.During this period, discharge chambe 20 are connected to injection access 50g.Therefore, the refrigerant for having passed through injection flow path is flowed into via injection access 50g, and is pressed Refrigerant in contracting room 20 is compressed and with moving closer to central portion mobile.

When lighting when the rotation of main shaft 7 is sucked and completed from refrigerant more than 360 degree, discharge chambe 20 and injection access It is no longer connected between 50g.Also, after which, before discharge chambe 20 is connected to outlet 1d, be always maintained at refrigerant not from The state that outside is flowed into discharge chambe 20, the refrigerant in discharge chambe 20 are compressed.Also, when the rotational progression of main shaft 7 makes When discharge chambe 20 is connected to outlet 1d, compressed refrigerant is discharged from outlet 1d into closed container 10.

Fig. 8 is the injection structure portion 50 illustrated when being sprayed in the screw compressor 100 of embodiments of the present invention 1 The figure of the flowing of neighbouring refrigerant etc..Next, illustrating the movement of the check-valves 50h in injection structure portion 50.When to scroll compression When contracting machine 100 is sprayed, the refrigerant of gas-liquid two-phase state is flowed into from injection pipe 41 into screw compressor 100.Then, it flows The refrigerant entered is from the injection first flow path 50a of the inside for the base plate 1a for being formed in fixed eddy plate 1 to injection second flow path 50b Advance.The mobilization of refrigerant is moved in the end face of check-valves 50h, check-valves 50h to open direction (the upper direction of Fig. 8) It is dynamic.The first processing hole is arranged in a manner of keeping flatness appropriate, the depth of parallelism relative to check-valves 50h in first cover 50j In 50d.Check-valves 50h touching is butted on the end face of the first cover 50j and stops moving.The refrigerant of check-valves 50h is passed through in non-return Valve is stored in road 50f, injection third flow path 50c and injection access 50g by flowing into discharge chambe 20.

Fig. 9 is the injection structure portion illustrated when not sprayed in the screw compressor 100 of embodiments of the present invention 1 The figure of the flowing of refrigerant near 50 etc..When not sprayed to screw compressor 100, in heat pump assembly, second is swollen Swollen valve 56 becomes the aperture smaller than defined aperture.Therefore, refrigerant is not flowed into from injection pipe 41.

For example, in 100 not set check-valves 50h of screw compressor, with the compression under injection access 50g connected state The pressure of the refrigerant in pressure ratio injection flow path in room 20 is high.Therefore, it is connected in discharge chambe 20 with injection access 50g When, refrigerant in discharge chambe 20 is via injection access 50g to the outflow of injection flow path and adverse current.In this case, from injection The volume for spraying flow path of access 50g to the second expansion valve 56 becomes the dead volume under compression, and compression efficiency declines to a great extent.

When being provided with check-valves 50h the screw compressor 100 such as embodiment 1, pressure in discharge chambe 20 from Injection access 50g is transferred to check-valves storage road 50f and acts on the back side of check-valves 50h, and thus check-valves 50h is to occlusion Direction (the lower direction of Fig. 9) it is mobile, be close to check-valves restraint face 1e.Therefore, pass through the movement of check-valves 50h, Neng Goufang Only the pressure in discharge chambe 20 to from injection second flow path 50b to the space of the second expansion valve 56 adverse current.Therefore, it can reduce Dead volume under compression, therefore can significantly improve compression efficiency.

In addition, the first cover 50j is to separate space in the high pressure gas space and injection structure portion 50 in closed container 10 Mode be arranged.Also, the first cover 50j play will in the high pressure gas space and injection structure portion 50 in closed container 10 it is empty Between occlude effect while, be arranged in first in a manner of keeping flatness and the depth of parallelism appropriate relative to check-valves 50h Processing is in the 50d of hole.Therefore, the first cover 50j becomes the seat surface of taking a seat of valve seat when check-valves 50h is opened.Therefore, can become Reduce the simple structure of number of components.

Embodiment 2.

Figure 10 is the figure for illustrating the injection structure portion 50 of screw compressor 100 of embodiments of the present invention 2.Next, Illustrate the screw compressor 100 of embodiment 2.In embodiment 2, for marking and 1 same reference numerals of embodiment Equipment etc. similarly act with the movement illustrated in embodiment 1.

The screw compressor 100 of embodiment 2 is that have relative to the check-valves 50h of embodiment 1 as elastomer The structure of check-valve spring 50m.Flow path is closed check-valves 50h to check-valves 50h by the check-valve spring 50m of embodiment 2 Direction (the lower direction of Figure 10) applied force of plug.Moreover, the first cover 50j of embodiment 2 has spring storage mouth 50n.Also, First cover 50j is to store one end of check-valve spring 50m, be fixed on the structure that spring stores mouth 50n.

Next, illustrating the movement etc. of the check-valves 50h in the operating of the screw compressor 100 of embodiment 2.Not into When row injection, the refrigerant for not coming the side self-injection second flow path 50b is flowed into, and carrys out self-injection the to check-valves 50h application The power of two sides flow path 50b.Check-valves 50h is pressed in check-valves to the power that check-valves 50h applies by check-valve spring 50m Restraint face 1e.By the way that there is check-valve spring 50m the screw compressor 100 such as embodiment 2 and apply to check-valves 50h Power, check-valves 50h can more reliably occlude flow path.Moreover, from the state sprayed to the state without injection When switching, the direction (the lower direction of Figure 10) that check-valves 50h will be occluded to flow path is mobile.At this point, by applying check-valve spring The power of 50m, check-valves 50h are rapidly moved, and can prevent the closing of flow path from postponing.In addition, ejector refrigeration agent from injection third Flow path 50c acts on the side check-valve spring 50m to check-valves storage road 50f adverse current.At this point, check-valve spring 50m is stored Mouth 50n is stored in spring.Therefore, falling off for check-valve spring 50m can be prevented.

Embodiment 3.

The screw compressor 100 of embodiments of the present invention 3 is the first cover 50j and the of embodiment 1 or embodiment 2 Two cover 50k are pressed into and fixed structure.The structure of the screw compressor 100 of embodiment 3 in embodiment 1 or embodiment party The screw compressor 100 illustrated in formula 2 is identical.

The outer diameter of first cover 50j is slightly larger with the internal diameter of hole 50d relative to the first processing.Moreover, the second cover 50k's is outer Diameter size is slightly larger with the internal diameter of hole 50e relative to the second processing.When the first cover 50j is inserted in the first processing hole 50d, at To pass through the fixed structure of indentation.Moreover, by second cover 50k be inserted in the second processing hole 50e in the case where, also at To pass through the fixed structure of indentation.

According to the screw compressor 100 of embodiment 3, the first cover 50j is fixed in the first processing hole by indentation 50d moreover, the second cover 50k is fixed in the second processing hole 50e by being pressed into, therefore can cut down in order to by closed appearance The number of components for separating in device 10 with the space as flow path in injection structure portion 50 and using.Therefore, it is able to suppress cost.

Embodiment 4.

Figure 11 is the figure for illustrating the injection structure portion 50 of screw compressor 100 of embodiments of the present invention 4.Next, Illustrate the screw compressor 100 of embodiment 4.In embodiment 4, for the same reference numerals such as mark and embodiment 1 Equipment etc., carry out with embodiment 1 it is equal in the movement that illustrates similarly act.

In Figure 11, there is pressure to discharge access 50p by the first cover 50j of embodiment 4 and the second cover 50k.Pressure release Access 50p be the rising in order to inhibit the pressure in the space in injection structure portion 50 and release stress and the small connection that is arranged Hole.

Next, illustrating the movement etc. in the operating of the screw compressor 100 of embodiment 4.In common operating, spray Penetrating the pressure in the space of structural portion 50 will not be higher than in closed container 10.However, for example, the refrigerant in liquid is flowed into pressure In the case where in contracting room 20, since the pressure based on liquid compression rises, in the space in injection structure portion 50 pressure sometimes at For the high pressure higher than the pressure in closed container 10.At this point, applying the power for removing direction to the first cover 50j and the second cover 50k.? This, removing direction for the first cover 50j is the upper direction in Figure 11.Moreover, in Figure 11 for the second cover 50k Left direction.

For example, first cover 50j is used from the first processing if the power for removing direction is greater than the power that the first cover 50j is fixed Hole 50d is removed.Equally, if the power for removing direction is greater than the power that the second cover 50k is fixed, second covers 50k from the second processing It is removed with hole 50e.At this point, for example, being damaged sometimes closed if the impetus of the removal of the first cover 50j or the second cover 50k is strong Container 10.

Therefore, in the screw compressor 100 of embodiment 4, by injection structure and with pressure release access 50p Pressure release in the space in portion 50.Here, can have multiple pressure release access 50p.

For example, if first cover 50j and second cover 50k be in common position, as shown in figure 11, first cover 50j and First processing is in the state being close to hole end surface 1f.Equally, the second cover 50k and the second processing are with hole end surface 1g in being close to State.Therefore, the first cover 50j and the second cover 50k can be by the space in the space and injection structure portion 50 in closed container 10 Between separate.

Figure 12 is to indicate the cover 50k of the first cover 50j and second to the figure for removing the situation that direction is moved.Such as Figure 12 Shown, covering 50k to direction is removed in the first cover 50j and second (is the upper direction of Figure 12 for the first cover 50j.Moreover, right The left direction for being Figure 12 for the second cover 50k) when having carried out mobile, in closed container 10 in space and injection structure portion 50 Space discharges access 50p by pressure and is connected to.By by pressure in the space in injection structure portion 50 into closed container 10 The power of space release, the removal direction applied to the first cover 50j and the second cover 50k weakens.Therefore, the first cover 50j can be prevented And the second cover 50k the case where removing completely.

Figure 13 is another figure for illustrating the injection structure portion 50 of the screw compressor 100 of embodiments of the present invention 4. In Figure 13, pressure release access 50p is provided with hole 50d and the second processing with hole 50e in the first processing.Even if adding first Work discharges access 50p with hole 50d and the second processing hole 50e setting pressure, can also play and cover in the first cover 50j and second 50k is arranged pressure and discharges the same effect of access 50p.

Embodiment 5.

Figure 14 is the figure for illustrating the injection structure portion 50 of screw compressor 100 of embodiments of the present invention 5.Next, Illustrate the screw compressor 100 of embodiment 5.In embodiment 5, for the same reference numerals such as mark and embodiment 1 Equipment etc., carry out with embodiment 1 it is equal in the movement that illustrates similarly act.

In Figure 14, the first cover 50j and second, which covers 50k, has thread groove in peripheral side face.Moreover, being fixed on fixed eddy plate 1 base plate 1a.Moreover, also there is thread groove in the inner circumferential side of the first processing hole 50d and the second processing hole 50e.Cause This, can be by the first cover 50j screw threads for fastening in the first processing hole 50d.Equally, the second cover 50k screw threads for fastening can be existed Second processing is in the 50e of hole.Here, in the fastening linking part based on screw threads for fastening of the first cover 50j and the first processing hole 50d Divide and the fastening linking portion based on screw threads for fastening of the second cover 50k and the second processing hole 50e has sealing element 50q, prevents The leakage of refrigerant.

Figure 15 is another figure for illustrating the injection structure portion 50 of the screw compressor 100 of embodiments of the present invention 5. As shown in figure 15, screw 14 can be used, the first cover 50j is threadably secured with the first processing with hole 50d.It is also possible to Second cover 50k is threadably secured with the second processing with hole 50e.Also, sealing element 50q can cover 50j and second for first It covers and is sealed between the end face and base plate 1a of 50k.

In the screw compressor 100 of embodiment 5, the first cover 50j and the second cover 50k are fixed on by screw threads for fastening Base plate 1a, therefore can cut down the portion of the pressure space separation in the space and injection structure portion 50 in closed container 10 Number of packages amount, is able to suppress cost.

Description of symbols

1 fixed eddy plate, 1a base plate, 1b scrollwork tooth, 1c Euclidean guiding groove, 1d outlet, 1e check-valves restraint face, 1f One processing hole end surface, the processing hole end surface of 1g second, 2 pendulum movable orbiting scrolls, 2a base plate, 2b scrollwork tooth, 2c oscillation bearing, 2d are pushed away Power face, 2e Euclidean guiding groove, 2f boss portion, 2g boss portion outer diameter space, 2h bottom plate outer diameter part space, 2j aspirating hole, 3 flexible boxs Frame, 3a thrust bearing, 3c base bearing are fitted into barrel surface on 3d, barrel surface, 3f intercommunicating pore are fitted under 3e, and 3g intermediate pressure adjusts valve, 3h valve pressing piece, 3k intermediate pressure adjust spring, and 3n adjusts valve space, 3p valve outer diameter space, and 4 guiding frames are fitted into cylinder on 4a Face is fitted into barrel surface, 4c frame space, 5 motor, 5a rotor, 5b stator, 6 sub-frames, 6a supplementary bearing, 7 main shafts, 7b under 4b Swing axle portion, 7c main shaft part, 7d countershaft portion, 7e high pressure oil oil supplying hole, 8 Euclidean mechanisms, 8a, 8b pawl, 8c Euclidean mechanism annulus, 10 closed containers, 11 refrigerator oils, 12 discharge pipes, 13 suction lines, 14 screws, 16a upper seal, 16b lower seal, 20, 20a, 20b discharge chambe, 41 injection pipes, 50 injection structure portions, 50a spray first flow path, and 50b sprays second flow path, 50c injection the Hole is used in three flow paths, the processing of 50d first, and hole is used in the processing of 50e second, and 50f check-valves stores road, and 50g sprays access, 50h non-return Valve, 50j first cover, and 50k second covers, 50m check-valve spring, 50n spring storage mouth, 50p pressure release access, 50q sealing element, 52 load-side heat exchangers, 53 first expansion valves, 54 inner heat exchangers, 55 third expansion valves, 56 second expansion valves, 57 heat sources Side heat exchanger, 58 four-way valves, 59 liquid storage devices, 60 open and close valves, 61 the 4th expansion valves, 100 screw compressors.

Claims (7)

1. a kind of screw compressor, wherein

The screw compressor has:

Fixed eddy plate, the fixed eddy plate have the fixed scroll tooth of scroll in bottom plate, the swing whirlpool having with pendulum movable orbiting scroll Volume tooth combines and forms discharge chambe, supplies the refrigerant flowed into from outside with being connected to the discharge chambe in the inside of the bottom plate By injection flow path；

Check-valves, the check-valves are set in the injection flow path, avoid refrigerant from the discharge chambe to the injection stream It is flowed in road；

Cover, the processing hole that the injection flow path is connected to by the cover occlusion with the outer surface of the bottom plate, becomes the check-valves Valve seat；And

Pressure discharges access, and the pressure release access is covered by described to the direction movement and institute removed from the processing hole It states and is connected to outside bottom plate, to discharge the pressure in the injection flow path.

2. screw compressor according to claim 1, wherein

The screw compressor has the elastomer for applying the power acted on to the direction for closing valve to the check-valves,

The cover has the storage mouth for storing the elastomer.

3. screw compressor according to claim 1 or 2, wherein

The cover is fixed in the processing hole, and the processing hole is occluded.

4. screw compressor according to claim 3, wherein

The pressure release access is covered with described.

5. screw compressor according to claim 3, wherein

A part in the processing hole that the bottom plate of the fixed eddy plate has is equipped with the pressure and discharges access.

6. screw compressor according to claim 1 or 2, wherein

The cover and bottom plate fastening are linked by screw, so that the cover occludes the processing hole.

7. a kind of heat pump assembly, wherein fill screw compressor, heat source side heat exchanger, load-side heat exchanger and throttling It sets and carries out piping connection and constitute refrigerant circuit,

The screw compressor is screw compressor according to any one of claims 1 to 6,

The heat source side heat exchanger carries out the heat exchange of refrigerant and air,

The load-side heat exchanger carries out heat exchange to heat exchange object and refrigerant,

The throttling set adjusts the flow and pressure of the refrigerant flowed into the load-side heat exchanger.