CN1318145A - Refrigerating device - Google Patents

Abstract

A refrigerating device, wherein an oil return mechanism (Z) returning a refrigerating machine oil separated from suction gas refrigerant preferentially to a compressor (1A) of a minimum capacity among compressors (1A, 1B) having the capacities different from each other is provided in a suction line (X) of the compressors (1A, 1B), and an oil return passage (117) returning the refrigerating machine oil separated in an oil separator (116) installed in a delivery pipe (115) of the compressors (1A, 1B) to the compressor (1A) of the minimum capacity among the compressors (1A, 1B, ---) is provided, whereby the refrigerating machine oil separated in the oil separator (116) and the refrigerating machine oil in the suction gas refrigerant are returned sequentially to the compressor (1B) having a low dome internal pressure after they return preferentially to the compressor (1A) of the minimum capacity.

Description

Refrigerating plant

Technical field

The present invention relates in the refrigerating plant oil return structure towards compressor.

Background technology

In the refrigerating plant that Duo Tai (for example 2) compressor connects side by side, compressor capacity separately is often different.This refrigerating plant is when all compressor operations, and dome chamber in the compressor separately (De one system) internal pressure creates a difference.In addition, the refrigerating machine oil of the bottom in the dome chamber in the compressor moves from the compressor that the high compressor of interior pressure inwardly forces down by balance pipe.

In case continue the running of this state, then the compressor that constantly forces down in the dome chamber of the refrigerating machine oil of the compressor that pressure is high in dome the chamber in moves.If this state continuance goes down, the refrigerating machine oil of the compressor that pressure is high in the dome chamber is flow to end, damage compressor.

For solving above-mentioned bad phenomenon, it is all amounts running control of oil that a kind of method is arranged.All amounts of this oil running control is alternate-running compressor at regular intervals, to guarantee the refrigerator oil amount in the compressor separately.

Yet, when all amounts running control of carrying out above-mentioned oil, running when can only carry out all compressors within a certain period of time.The result exists the problem that can't obtain the refrigerating plant desired volume.

In view of the above problems, the object of the invention is, a kind of refrigerating plant that a plurality of compressors of different capabilities are housed is provided, and it can carry out refrigerating machine oil reliably to the backflow of compressor separately.

Disclosure of an invention

For solving above-mentioned problem, the present invention takes following measure.

The 1st invention is to connect side by side mutually and different a plurality of compressor 1A, the 1B of capacity to have ... the refrigerating plant that is provided with refrigerant loop A be object.And for making refrigerating machine oil in the cold-producing medium of described refrigerant loop A circulation according to each compressor 1A, 1B ... different capabilities to each compressor 1A, 1B ... distribute, be provided with and make this refrigerating machine oil turn back to compressor 1A, 1B ... distributor gear R.

In the 1st invention, as compressor 1A, 1B ... during running, refrigerating machine oil is according to each compressor 1A, 1B ... distribute.Therefore, even carry out all amounts running control of the oil of compressor alternate-running not resembling in the past, also can guarantee a plurality of compressor 1A, 1B ... refrigerating machine oil.

The 2nd invention is to connect side by side mutually and different a plurality of compressor 1A, the 1B of capacity to have ... the refrigerating plant that is provided with refrigerant loop A be object.And, for make refrigerating machine oil in the cold-producing medium of described refrigerant loop A circulation from the compressor 1A of minimum capacity to other compressor 1B ... distribute, be provided with and make this refrigerating machine oil turn back to compressor 1A, 1B ... distributor gear R.

In the 2nd invention, as compressor 1A, 1B ... during running, refrigerating machine oil from the compressor 1A of minimum capacity to other compressor 1B ... distribute.Therefore, even carry out all amounts running control of the oil of compressor alternate-running not resembling in the past, also can guarantee a plurality of compressor 1A, 1B ... refrigerating machine oil.

The 3rd invention is to connect side by side mutually and different a plurality of compressor 1A, the 1B of capacity to have ... the refrigerating plant that is provided with refrigerant loop A be object.And, for make refrigerating machine oil in the cold-producing medium of described refrigerant loop A circulation from the compressor 1A of heap(ed) capacity to other compressor 1B ... distribute, be provided with and make this refrigerating machine oil turn back to compressor 1A, 1B ... distributor gear R.

In the 3rd invention, as compressor 1A, 1B ... during running, refrigerating machine oil from the compressor 1A of heap(ed) capacity to other compressor 1B ... distribute.Therefore, even carry out all amounts running control of the oil of compressor alternate-running not resembling in the past, also can guarantee a plurality of compressor 1A, 1B ... refrigerating machine oil.

The 4th the invention be, above-mentioned the 2nd the invention in, compressor 1A, 1B ... adopt low pressure dome chamber type compressor.And, described distributor gear R has and compressor 1A, 1B ... the oil equalizing pipe 109 that is communicated with and be located at described compressor 1A, 1B ... the oil eliminator 116 that refrigerating machine oil in the separation discharging refrigerant of discharge side is used is by refrigerating machine oil and described compressor 1A, the 1B of described oil eliminator 116 separation ... the suction cold-producing medium in the refrigerating machine oil that comprises preferentially be back to the compressor 1A of minimum capacity.

In the 4th invention, from compressor 1A, 1B ... the refrigerating machine oil of discharging is reclaimed by oil eliminator 116.The refrigerating machine oil of this oil eliminator 116 and be back to compressor 1A, 1B ... the refrigerating machine oil of suction side is got back to the compressor 1A of minimum capacity by preferential flow.Then, because of the interior pressure reduction in dome chamber, be back to compressor 1B, the 1C that forces down in the dome chamber through oil equalizing pipe 109 from the compressor 1A of described minimum capacity ...

The 5th the invention be, above-mentioned the 3rd the invention in, compressor 1A, 1B ... adopt high pressure dome chamber type compressor.And, described distributor gear R has and compressor 1A, 1B ... the oil equalizing pipe 48 that is communicated with and be located at described compressor 1A, 1B ... the oil eliminator 36 that refrigerating machine oil in the separation discharging refrigerant of discharge side is used is by refrigerating machine oil and described compressor 1A, the 1B of described oil eliminator 36 separation ... the suction cold-producing medium in the refrigerating machine oil that comprises got back to the compressor 1A of heap(ed) capacity by preferential flow.

In the 5th invention, from compressor 1A, 1B ... the refrigerating machine oil of discharging is reclaimed by oil eliminator 36.The refrigerating machine oil of this oil eliminator 36 and flow back into compressor 1A, 1B ... the refrigerating machine oil of suction side is got back to the compressor 1A of heap(ed) capacity by preferential flow.Then, because of the interior pressure reduction in dome chamber, be back to the compressor 1B that forces down in the dome chamber through oil equalizing pipe 48 from the compressor 1A of described heap(ed) capacity ...

The 6th invention has by refrigerant piping in order with a plurality of low pressure domes chamber type compressor 1A, the 1B of the different capabilities separately of connection parallel with one another ..., heat source side interchanger 2, the mechanism of decompressor 3 and the refrigerant loop A that uses side heat exchanger 4 to be connected, to make described compressor 1A, 1B by oil equalizing pipe 9,9 ... the refrigerating plant that is interconnected is an object.

And, at described compressor 1A, 1B ... discharge pipe arrangement 15 on, be provided with to separate and discharge the oil eliminator 16 that the refrigerating machine oil in the gas refrigerant is used, again at described compressor 1A, 1B ... suction circuit X in, be provided with and preferentially will suck the refrigerating machine oil that comprises in the gas refrigerant and turn back to described compressor 1A, 1B ... in the oil return mechanism Z that uses of the compressor 1A of minimum capacity.In addition, be provided with the refrigerating machine oil after separating in the described oil eliminator 36 is turned back to described compressor 1A, 1B ... in the drainback passage 37 used of the compressor 1A of minimum capacity.

In the 6th invention, as compressor 1A, 1B ... during running, preferentially turned back to the compressor 1A of minimum capacity by the refrigerating machine oil and the refrigerating machine oil in the suction gas refrigerant of oil eliminator 16 separation.Then, refrigerating machine oil because of the interior pressure reduction in dome chamber (the interior pressure of interior pressure＞compressor 1C of interior pressure＞compressor 1B of compressor 1A＞...), and turn back to compressor 1B, the 1C that forces down in the dome chamber from the compressor 1A of minimum capacity in order ...Therefore, even carry out all amounts running control of the oil of compressor alternate-running not resembling in the past, also can guarantee a plurality of compressor 1A, 1B ... refrigerating machine oil.

The 7th the invention be above-mentioned the 6th the invention in, described oil return mechanism Z comprises: constitute described suction circuit X a part and with described compressor 1A, 1B ... in the slightly horizontal certain-length that connects of the compressor 1A of minimum capacity suction pipe arrangement 25 and from the 1st suck the top branch of pipe arrangement 25 and respectively with described compressor 1A, 1B ... in the compressor 1A of minimum capacity beyond compressor 1B, 1C ... the 2nd suction pipe arrangement 26,26 that connects ...

Suck in the pipe arrangement 25 in the 1st of the 7th invention, refrigerating machine oil separates with the gas refrigerant difference of specific gravity because of refrigerating machine oil and flows to bottom the pipe.Refrigerating machine oil after the separation sucks the compressor 1A that pipe arrangement 25 turns back to minimum capacity from the 1st.Therefore, because of the change matched tube structure is simple, so can low cost and guarantee compressor 1A, 1B expeditiously ... in refrigerating machine oil.

The 8th invention is that described oil return mechanism Z comprises in above-mentioned the 6th invention: constitute the part of described suction circuit X and form the open vertical tube 27 in lower end downwards; In the face of the bottom of this vertical tube 27 and horizontal profile sectional area body 28 greater than this vertical tube 27; Be connected with these body 28 lower ends and with described compressor 1A, 1B ... in the compressor 1A of minimum capacity connect the 1st suck pipe arrangement 25; And be connected with the sidewall of described body 28 and respectively with described compressor 1A, 1B ... in the compressor 1A of minimum capacity beyond compressor 1B, 1C ... the 2nd suction pipe arrangement 26,26 that connects ...

In the 8th invention, because of the suction gas refrigerant that flows into body 28 from vertical tube 27 sharply expands in this body 28, so refrigerating machine oil separates with the suction gas refrigerant.Refrigerating machine oil after the separation is because of gravity and action of inertia, and sucks the compressor 1A that pipe arrangement 25 turns back to minimum capacity from the 1st.Therefore, because of the change matched tube structure is simple, so can low cost and guarantee compressor 1A, 1B expeditiously ... in refrigerating machine oil.

The 9th invention is that described oil return mechanism Z comprises in above-mentioned the 6th invention: constitute the part of described suction circuit X and the vertical section sectional area horizontal large diameter pipe 29 greater than this suction circuit X; Be connected with these horizontal large diameter pipe 29 tube walls and with described compressor 1A, 1B ... in the compressor 1A of minimum capacity connect the 1st suck pipe arrangement 25; And with one heart shape ground in the face of the central part of described horizontal large diameter pipe 29 also respectively with described compressor 1A, 1B ... in the compressor 1A of minimum capacity beyond compressor 1B, 1C ... the 2nd suction pipe arrangement 26,26 that connects ...

In the 9th invention, because of can relaxing the flow velocity of the suction gas refrigerant that flows through horizontal large diameter pipe 29, so, the suction gas refrigerant is separated with refrigerating machine oil at the annular flow of the slow tube wall side generation refrigerating machine oil of flow velocity.Refrigerating machine oil after the separation sucks the compressor 1A that pipe arrangement 25 turns back to minimum capacity from the 1st.Therefore, because of the change matched tube structure is simple, so can low cost and guarantee compressor 1A, 1B expeditiously ... in refrigerating machine oil.

The 10th invention is in each invention of the above-mentioned the 7th to the 9th, and described drainback passage 17 and the described the 1st sucks pipe arrangement 25 and is connected.

In the 10th invention, the refrigerating machine oil that is separated by oil eliminator 36 sucks in the pipe arrangement 25 with after suck the refrigerating machine oil interflow that gas refrigerant separates the 1st, turns back to the compressor 1A of minimum capacity.Its result does not need to change the structure (as shell mechanism etc.) of compressor 1A.

The 11st invention is to have by in order that each self-capacity of connection parallel with one another is different a pair of high pressure dome chamber type compressor 1A, 1B, four-port conversion value 2, heat source side heat exchanger 3, the mechanism of decompressor 4 of refrigerant piping and to use the refrigerant loop A that side heat exchanger 5 connected, the refrigerating plant that described compressor 1A, 1B is interconnected by oil equalizing pipe 48 to be object.

And, on the discharge pipe arrangement 47 of described compressor 1A, 1B, be provided with to separate and discharge the oil eliminator 36 that the refrigerating machine oil in the gas refrigerant is used, and the drainback passage 37 that the refrigerating machine oil after separating in this oil eliminator 36 is turned back to described compressor 1A, 1B suction side is set.In addition, in this drainback passage 37, be provided with the open and close valve 39 of closing when shutting down together at described compressor 1A, 1B.

In the 11st invention, when compressor 1A, 1B turn round together, turn back to compressor 1A, 1B respectively through drainback passage 37 by oil eliminator 36 refrigerating machine oil that separates and the refrigerating machine oil that sucks in the gas refrigerant.At this moment, most of refrigerating machine oil turns back to compressor 1A capacious.The interior pressure of compressor 1A capacious is greater than the interior pressure of the little compressor 1B of capacity.The result is that refrigerating machine oil moves to the little compressor 1B of capacity from compressor 1A capacious by oil equalizing pipe, is back to two compressor 1A, 1B reliably.

Therefore, even carry out all amounts running control of the oil of compressor alternate-running not resembling in the past, also can guarantee the refrigerating machine oil of compressor 1A, 1B.And when compressor 1A, 1B shut down together, open and close valve 39 was closed, and drainback passage 37 becomes non-connected state.Therefore, cold-producing medium can not flow to the suction side of compressor 1A from oil eliminator 36 during shutting down.

The 12nd invention is to have by refrigerant piping in order that each self-capacity of connection parallel with one another is different a pair of high pressure dome chamber type compressor 1A, 1B, four-port conversion value 2, heat source side heat exchanger 3, the mechanism of decompressor 4, to use the refrigerant loop A that side heat exchanger 5 connected, the refrigerating plant that described compressor 1A, 1B is interconnected by oil equalizing pipe 48 to be object.

And, on the discharge pipe arrangement 47 of described compressor 1A, 1B, be provided with to separate and discharge the oil eliminator 36 that the refrigerating machine oil in the gas refrigerant is used, and drainback passage 37A, the 37B that the refrigerating machine oil after separating in this oil eliminator 36 is turned back to the suction side of described compressor 1A, 1B respectively is set.In addition, in this drainback passage 37A, 38B, be respectively equipped with the open and close valve 39A, the 39B that close when shutting down together at described compressor 1A, 1B.

In the 12nd invention, when compressor 1A, 1B turn round together, turn back to compressor 1A, 1B respectively through drainback passage 37A, 37B by oil eliminator 36 refrigerating machine oil that separates and the refrigerating machine oil that sucks in the gas refrigerant.At this moment, most of refrigerating machine oil is back to compressor 1A capacious.The interior pressure of compressor 1A capacious is greater than the interior pressure of the little compressor 1B of capacity.The result is that refrigerating machine oil moves to the little compressor 1B of capacity from compressor 1A capacious by oil equalizing pipe 48, is back to two compressor 1A, 1B reliably.

Therefore, even carry out all amounts running control of the oil of compressor alternate-running not resembling in the past, also can guarantee the refrigerating machine oil of compressor 1A, 1B.And during compressor 1A, 1B shut down together, open and close valve 39A, 39B closed, and drainback passage 37A, 37B become non-connected state.Therefore, when cold-producing medium shuts down, can not flow to the suction side of compressor 1A, 1B from oil eliminator 36.

The 13rd invention is that in each invention, described oil equalizing pipe 48 is provided with certain 1 open and close valve of closing when shutting down 49 in described compressor 1A, 1B in the above-mentioned the 11st and the 12nd.

In the 13rd invention, when certain 1 running among compressor 1A, the 1B stopped, open and close valve 49 was closed, and forbade that refrigerating machine oil passes through moving of oil equalizing pipe 48.The result is, can stop the compressor of refrigerating machine oil from running to move to the compressor of running halted state, can not make the compressor in the running produce the refrigerating machine oil deficiency.

The 14th invention is to have by in order that each self-capacity of connection parallel with one another is different a pair of high pressure dome chamber type compressor 1A, 1B, four-port conversion value 2, heat source side heat exchanger 3, the mechanism of decompressor 4 of refrigerant piping and to use the refrigerant loop A that side heat exchanger 5 connected, the refrigerating plant that described compressor 1A, 1B is interconnected by oil equalizing pipe 48 to be object.

And, on the discharge pipe arrangement 47 of described compressor 1A, 1B, be provided with to separate and discharge the oil eliminator 36 that the refrigerating machine oil in the gas refrigerant is used, in this oil eliminator 36, the drainback passage 37 that the refrigerating machine oil that will separate turns back to described compressor 1A, 1B suction side is set again.In addition, on described oil equalizing pipe 48, be provided with the open and close valve 49 of closing when certain 1 running in described compressor 1A, 1B stops.

In the 14th invention, when compressor 1A, 1B turn round together, turn back to compressor 1A, 1B respectively through drainback passage 37 by oil eliminator 36 refrigerating machine oil that separates and the refrigerating machine oil that sucks in the gas refrigerant.At this moment, most of refrigerating machine oil is back to compressor 1A capacious.The interior pressure of compressor 1A capacious is greater than the interior pressure of the little compressor 1B of capacity.The result is that refrigerating machine oil moves to the little compressor 1B of capacity from compressor 1A capacious by oil equalizing pipe 48, flow back into two compressor 1A, 1B reliably.

Therefore, even carry out all amounts running control of the oil of compressor alternate-running not resembling in the past, also can guarantee the refrigerating machine oil of compressor 1A, 1B.

And when 1 running of certain in compressor 1A, 1B stopped, open and close valve 49 was closed, and forbade refrigerating machine oil moving through oil equalizing pipe 48.The result is, can stop the compressor of refrigerating machine oil from running to move to the compressor of running halted state, can not make the compressor in the running produce the refrigerating machine oil deficiency.

The 15th invention is that in each invention of the above-mentioned the 11st, the 12nd and the 14th, the suction line 38 of described compressor 1A, 1B is positioned at the suction inlet 50A of compressor 1A, 1B, the below of 50B.

In the 15th invention,, can prevent that refrigerating machine oil from passing through suction line 38 and flowing into compressor capacious when compressor operation capacious stops and the little compressor of capacity when being in operating condition.

Adopt the present invention, owing to utilize compressor 1A, 1B ... the different this point of capacity make refrigerating machine oil be back to each compressor 1A, 1B, therefore, carry out the oil of compressor alternate-running not needing to resemble in the past and all measure running control.The result is when bringing into play required refrigerating capacity all the time, can guarantee a plurality of compressor 1A, 1B reliably ... refrigerating machine oil.

Adopt the 6th invention, when compressor 1A, 1B turn round, the refrigerating machine oil that separates by oil eliminator 116 and suck refrigerating machine oil in the gas refrigerant after preferentially turning back to the compressor 1A of minimum capacity, because of the interior pressure reduction in dome chamber (the interior pressure of interior pressure＞compressor 1C of interior pressure＞compressor 1B of compressor 1A＞...) turn back to compressor 1B, the 1C that forces down in the dome chamber from this compressor 1A in order.Even the result carries out all amounts running control of the oil of compressor alternate-running not resembling in the past, also can guarantee a plurality of compressor 1A, 1B reliably ... refrigerating machine oil.

Adopt the 7th invention, because suck in the pipe arrangement 125 the 1st, refrigerating machine oil separates with the difference of specific gravity of gas refrigerant because of refrigerating machine oil, the inflow pipe bottom, therefore, the refrigerating machine oil after the separation sucks the compressor 1A that pipe arrangement 125 flows back to the minimum capacity among compressor 1A, the 1B through the 1st.Because of the change matched tube structure is simple, so can low cost and guarantee compressor 1A, 1B expeditiously ... in refrigerating machine oil.

Adopt the 8th invention, because flow into the suction gas refrigerant of body 128 sharply expands in this body 128 from vertical tube 127, therefore, refrigerating machine oil separates with the suction gas refrigerant, refrigerating machine oil after the separation utilizes gravity and inertia, turns back to compressor 1A, 1B through the 1st suction pipe arrangement 125 ... in the compressor 1A of minimum capacity.The result is, because of the change matched tube structure is simple, so can low cost and guarantee compressor 1A, 1B expeditiously ... in refrigerating machine oil.

Adopt the 9th invention, owing to can relax the flow velocity of the suction gas refrigerant that flows through horizontal large diameter pipe 129, therefore, can produce the annular flow of refrigerating machine oil in the slow tube wall side of flow velocity, refrigerating machine oil is separated with the suction gas refrigerant, and the refrigerating machine oil after the separation sucks pipe arrangement through the 1st and is back to compressor 1A, 1B ... in the compressor 1A of minimum capacity.The result is, because of the change matched tube structure is simple, so can low cost and guarantee compressor 1A, 1B expeditiously ... in refrigerating machine oil.

Adopt the 10th invention, the refrigerating machine oil that is separated by oil eliminator 116 collaborates with the refrigerating machine oil that separates from the suction gas refrigerant in the 1st suction pipe arrangement 125, turns back to the compressor 1A of minimum capacity.The result is not need to change the structure (as shell mechanism etc.) of compressor 1A.

Adopt the 11st invention, when compressor 1A, 1B turn round together, turn back to compressor 1A, 1B respectively through drainback passage 37 by oil eliminator 36 refrigerating machine oil that separates and the refrigerating machine oil that sucks in the cold-producing medium.And most of refrigerating machine oil is back to compressor 1A capacious, but since the interior pressure of compressor 1A capacious greater than the interior pressure of the little compressor 1B of capacity, therefore, refrigerating machine oil moves to the little compressor 1B of capacity by oil equalizing pipe 48.The result is to be back to two compressor 1A, 1B reliably.Even carry out all amounts running control of the oil of compressor alternate-running not resembling in the past, also can guarantee the refrigerating machine oil of compressor 1A, 1B.

And, when compressor 1A, 1B shut down together,, make drainback passage 37 become non-connected state because open and close valve 39 is made closing motion, therefore, cold-producing medium can not flow to the suction side from oil eliminator 36 when shutting down.

In the 12nd invention, when compressor 1A, 1B turn round together, turn back to compressor 1A, 1B respectively through drainback passage 37A, 37B by oil eliminator 36 refrigerating machine oil that separates and the refrigerating machine oil that sucks in the gas refrigerant.And most of refrigerating machine oil turns back to compressor 1A capacious, but since the interior pressure of compressor 1A capacious greater than the interior pressure of the little compressor 1B of capacity, therefore, refrigerating machine oil moves to the little compressor 1B of capacity by oil equalizing pipe 48.The result is, is back to two compressor 1A, 1B reliably, even carry out all amounts running control of the oil of compressor alternate-running not resembling in the past, also can guarantee the refrigerating machine oil of compressor 1A, 1B.

And, when compressor 1A, 1B shut down together,, make drainback passage 37A, 37B become non-connected state because open and close valve 39A, 38B make closing motion, therefore, cold-producing medium can not flow to the suction side from oil eliminator 36 when running stopped.

Adopt the 13rd invention, when 1 of certain in compressor 1A, 1B shut down, open and close valve 49 was made closing motion, forbade that refrigerating machine oil passes through moving of oil equalizing pipe 48.The result is, can stop the compressor of refrigerating machine oil from running to move to the compressor of running halted state, can not make the compressor in the running produce the refrigerating machine oil deficiency.

Adopt the 14th invention, when compressor 1A, 1B turn round together, turn back to compressor 1A, 1B respectively through drainback passage 37 by oil eliminator 36 refrigerating machine oil that separates and the refrigerating machine oil that sucks in the gas refrigerant.And most of refrigerating machine oil flows back to compressor 1A capacious, but since the interior pressure of compressor 1A capacious greater than the interior pressure of the little compressor 1B of capacity, therefore, refrigerating machine oil moves to the little compressor 1B of capacity by oil equalizing pipe 48.The result is, is back to two compressor 1A, 1B reliably, even carry out all amounts running control of the oil of compressor alternate-running not resembling in the past, also can guarantee the refrigerating machine oil of compressor 1A, 1B.

And when 1 running of certain in compressor 1A, 1B stopped, open and close valve 48 was made closing motion, and the refrigerating machine oil by oil equalizing pipe 48 can not be moved.The result is, forbids that the compressor of refrigerating machine oil from running moves to the compressor of running halted state, can not make the compressor in the running produce the refrigerating machine oil deficiency.

Adopt the 15th invention, when compressor capacious is in the little compressor operation of running halted state and capacity, can prevent that refrigerating machine oil from passing through suction line 38 and flowing into compressor capacious.

The simple declaration of accompanying drawing

Fig. 1 is the refrigerant piping system diagram of the refrigerating plant of the present invention's the 1st example.

Fig. 2 represents to suck in the refrigerating plant of the present invention's the 1st example the piping diagram of circuit pack structure.

Fig. 3 represents to suck in the refrigerating plant of the present invention's the 2nd example the piping diagram of circuit pack structure.

Fig. 4 represents to suck in the refrigerating plant of the present invention's the 3rd example the piping diagram of circuit pack structure.

Fig. 5 represents to suck in the refrigerating plant of the present invention's the 4th example the piping diagram of circuit pack structure.

Fig. 6 is the refrigerant loop figure of the refrigerating plant of the present invention's the 5th example.

Fig. 7 represents the piping diagram of suction line part-structure in the refrigerating plant of the present invention's the 5th example.

Fig. 8 is the compressor in the refrigerating plant of the present invention's the 6th example and the instruction card of electromagnetic opening and closing valve operating state thereof.

Fig. 9 represents the piping diagram of suction line part-structure in the refrigerating plant of the present invention's the 6th example.

The optimal morphology that carries out an invention

Below, with reference to drawing example of the present invention is described.

Fig. 1 and Fig. 2 represent the refrigerant piping system of the refrigerating plant of the present invention's the 1st example.

As shown in Figure 1, this refrigerating plant have each self-capacity of connection parallel with one another different 2 compressor 1A, 1B, play the effect of heat source side heat exchanger air-cooled condenser 102, play the expansion valve 103 of mechanism of decompressor effect and use a pair of evaporimeter 104,104 of side heat exchanger effect to be connected the refrigerant loop A that constitutes by playing of will being connected in parallel in order of refrigerant piping.

Wherein, the capacity of described the 1st compressor 1A is 4HP, and the capacity of the 2nd compressor 1B is 5HP.The oil storage portion of described the 1st compressor 1A is connected by oil equalizing pipe 109 with the oil storage portion of the 2nd compressor 1B.

Between described condenser 102 and expansion valve 103, be provided with the accumulator tank 105 that is connected with this condenser 102 outlet sides, utilize outdoor air that the liquid refrigerant from the liquid phase portion of this accumulator tank 105 is carried out overcooled the 1st supercooling heat exchanger 106 and the evaporation latent heat by gas-liquid mixed refrigerant further carries out overcooled the 2nd supercooling heat exchanger 107 to the supercooling liquid refrigerant from the 1st supercooling heat exchanger 106.Between described condenser 102 and the 1st supercooling heat exchanger 106, be provided with 1 outdoor fan 108.

From the part of the liquid refrigerant of the liquid phase portion of described accumulator tank 105 through 110 decompressions of temperature-sensitive expansion valve and supply to described the 2nd supercooling heat exchanger 107.With on described the 2nd supercooling heat exchanger 107 and the gas pipe arrangement 112 that the suction line 111 of a suction circuit X part that constitutes described compressor 1A, 1B is connected, be provided with the temperature sensing tube 110a of this temperature-sensitive expansion valve 110.That is, temperature-sensitive expansion valve 110 is controlled aperture according to the gas refrigerant temperature that flows in gas pipe arrangement 112.

In described refrigerant loop A, be provided with connection compressor 1A, the discharge side of 1B and the hot gas bypass circulation 113 of suction side.In this hot gas bypass circulation 113, electromagnetic opening and closing valve 114 is housed, to cross when low when low-pressure, this electromagnetic opening and closing valve 114 is made opening action, to prevent the vacuum running.

On the discharge pipe arrangement 115 of described compressor 1A, 1B, be provided with the oil eliminator 116 that the refrigerating machine oil that comprises in the divided gas flow cold-producing medium is used.The refrigerating machine oil that is separated by this oil eliminator 116 is back to the compressor 1A of minimum capacity as described later through drainback passage 117.In described drainback passage 117, make the electromagnetic opening and closing valve 118 and the capillary 119 of opening action when being provided with oil return.

On described evaporimeter 104,104, be provided with indoor fan 120.The discharge side of compressor 1A, 1B in described refrigerant loop A is provided with check valve 121.In addition, in described refrigerant loop A, also be provided with control to the electromagnetic opening and closing valve 122 of the cold-producing medium supply of evaporimeter 104,104, electromagnetic opening and closing valve 123 and the locking-valve 124 that control is supplied with to the cold-producing medium of the 2nd supercooling heat exchanger 107.

As shown in Figure 2, in the suction circuit X of described compressor 1A, 1B, be provided with the oil return mechanism Z that the refrigerating machine oil that will separate preferentially turns back to the compressor 1A of minimum capacity from suck gas refrigerant.This oil return mechanism Z is sucked pipe arrangement 125 and is sucked the top branch of pipe arrangement 125 and the 2nd suction pipe arrangement 126 that is connected with compressor 1B capacious is constituted from the 1st by the 1st of a part that constitutes described suction circuit X and the slightly horizontal certain-length that is connected with the compressor 1A of minimum capacity.

In addition, drainback passage 117 and described the 1st suction pipe arrangement 125 from described oil eliminator 116 is connected.

That is, described refrigerant loop A has the distributor gear R that refrigerating machine oil is back to compressor 1A, 1B.This distributor gear R distributes the refrigerating machine oil in the cold-producing medium of refrigerant loop A circulation according to the different capabilities of each compressor 1A, 1B to each compressor 1A, 1B.The distributor gear R of this example is according to the principle of distributing to other the 2nd compressor 1B from the 1st compressor 1A of minimum capacity, and will be back to compressor 1A, 1B at the refrigerating machine oil in the cold-producing medium of refrigerant loop A circulation.

Specifically, described distributor gear R has described oil equalizing pipe 109, oil eliminator 116, drainback passage 117 and oil return mechanism Z.And described distributor gear R can make in described oil eliminator 116 refrigerating machine oil that comprises in the suction gas refrigerant of the refrigerating machine oil that separates and described compressor 1A, 1B preferentially be back to the compressor 1A of minimum capacity.

Adopt this structure, when compressor 1A, 1B turn round, turn back to the compressor 1A of minimum capacity by the refrigerating machine oil and the refrigerating machine oil in the suction gas refrigerant of oil eliminator 116 separation.Then, described refrigerating machine oil is because of the interior pressure reduction (the interior pressure of interior pressure＞compressor 1B of compressor 1A) in dome chamber, and is back to the 2nd compressor 1B that forces down in the dome chamber from the 1st compressor 1A.Therefore, even carry out all amounts running control of the oil of compressor alternate-running not resembling in the past, also can guarantee the refrigerating machine oil of compressor 1A, 1B.

And, suck in the pipe arrangement 125 the 1st, because of the difference of specific gravity of refrigerating machine oil and gas refrigerant, and make refrigerating machine oil F separate inflow pipe bottom, back, the refrigerating machine oil F after the separation sucks the compressor 1A that pipe arrangement 125 is back to minimum capacity through the 1st.Therefore, because of the change matched tube structure is simple, so can low cost and guarantee refrigerating machine oil among compressor 1A, the 1B expeditiously.

Owing to sucking pipe arrangement 125, described drainback passage 117 and the 1st is connected again, therefore, the refrigerating machine oil that separates by oil eliminator 116 the 1st suck in the pipe arrangement 125 with from sucking after refrigerating machine oil that gas refrigerant separates collaborates, turn back to the 1st compressor 1A, do not need to change the structure (as shell mechanism etc.) of this compressor 1A.In addition, drainback passage 117 also can directly be connected with the 1st compressor 1A.

The 2nd example

Fig. 3 represents the suction circuit pack in the refrigerating plant of the present invention's the 2nd example.

Wherein, refrigerating plant has each self-capacity different 3 compressor 1A, 1B, 1C.The top of the 1st suction pipe arrangement 125 that is connected with the 1st compressor 1A is connected with the 2nd compressor 2B and the 2nd compressor 1C respectively by the 2nd suction pipe arrangement 126,126.Other structure and action effect thereof are all identical with the 1st example, the Therefore, omited explanation.

The 3rd example

Fig. 4 represents the suction circuit pack in the refrigerating plant of the present invention's the 3rd example.

Wherein, oil return mechanism X comprises: constitute the part of described suction circuit X and form the open vertical tube 127 in lower end downwards; In the face of the bottom of this vertical tube 127 and horizontal profile sectional area body 128 greater than this vertical tube 127; The 1st suction pipe arrangement 125 that is connected with these body 128 lower ends and is connected with the 1st compressor 1A of minimum capacity; And the 2nd suction pipe arrangement 126 that is connected with the sidewall of described body 128 and is connected with the 2nd compressor 1B.

Like this, flow into suction gas refrigerant in the bodys 128 because of rapid expansion this body 128 in from vertical tube 127, and refrigerating machine oil is separated with the suction gas refrigerant, the refrigerating machine oil after the separation utilizes gravity and inertia, turns back to compressor 1A through the 1st suction pipe arrangement 125.The result is, because of the change matched tube structure is simple, so can low cost and guarantee refrigerating machine oil among compressor 1A, the 1B expeditiously.

In addition, the suction gas refrigerant sucks according to the suction pressure of compressor 1A, 1B.This occasion also can be provided with 3 above compressors.Other structure and action effect thereof are all identical with the 1st example, the Therefore, omited explanation.

The 4th example

Fig. 5 represents the suction circuit pack in the refrigerating plant of the present invention's the 4th embodiment form.

At this moment, oil return mechanism X comprises: the part of formation suction circuit X and vertical section sectional area are greater than the horizontal large diameter pipe 129 of X in this suction line; The 1st suction pipe arrangement 125 that is connected with the tube wall of this horizontal large diameter pipe 129 and is connected with the 1st compressor 1A of minimum capacity; And concentric shape ground is in the face of the central part of described horizontal large diameter pipe 129 and the 2nd suction pipe arrangement 126 that is connected with the 2nd compressor 1B.

Like this, shown in velocity flow profile Y, because of relaxing the flow velocity of the suction gas refrigerant that in horizontal large diameter pipe 129, flows, so produce the annular flow of refrigerating machine oil in the slow tube wall side of flow velocity, refrigerating machine oil is separated with the suction gas refrigerant, and the refrigerating machine oil after the separation turns back to the 1st compressor 1A of minimum capacity through the 1st suction pipe arrangement 125.The result is, because of the change matched tube structure is simple, so can low cost and guarantee refrigerating machine oil among compressor 1A, the 1B expeditiously.

In addition, the suction gas refrigerant sucks according to the suction pressure of compressor 1A, 1B.This occasion also can be provided with 3 above compressors.Other structure and action effect thereof are all identical with the 1st example, the Therefore, omited explanation.

The 5th example

Fig. 6 and Fig. 7 represent the refrigerant piping system of the refrigerating plant of the present invention's the 5th example.

As shown in Figure 6, this refrigerating plant has heat pump air conditioner loop A and refrigeration refrigerant loop B.Heat pump air conditioner is that a pair of compressor 1A, 1B, four-port conversion value 2, the heat source side heat exchanger 3 of setting up outdoor fan 11, the expansion valve 4 that play mechanism of decompressor effect and the use side heat exchangers 5 in order that each self-capacity of connection parallel with one another is different by refrigerant piping are formed by connecting with the structure of refrigerant loop A; Refrigeration is to be formed by connecting with the suction side of evaporimeter 6 with described compressor 1A, 1B with the downstream branch of the described expansion valve 4 the refrigerant loop A and by refrigeration from this heat pump air conditioner with refrigerant loop B.This refrigeration also can be described as heat recovery circuit with refrigerant loop B.

Wherein, be that with the foregoing description 1 dissimilarity the capacity of the 1st compressor 1A is 5HP, the capacity of the 2nd compressor 1B is 4HP.And the oil storage portion of described the 1st compressor 1A is connected by oil equalizing pipe 48 with the oil storage portion of the 2nd compressor 1B.

Between described heat source side heat exchanger 3 and expansion valve 4, the accumulator tank 7 that partly is connected with the outlet side of described heat source side heat exchanger 3 when being provided with cooling operation, the liquid refrigerant from these accumulator tank 7 liquid phase sections is carried out the 1st supercooling heat exchanger 8 of overcooled air-cooled type and the evaporation latent heat of the gas-liquid mixed refrigerant that will be obtained by this supercooling liquid refrigerants part of temperature-sensitive expansion valve 10 decompressions from the supercooling liquid refrigerant utilization of the 1st supercooling heat exchanger 8 is made further the 2nd supercooling heat exchanger 9 of overcooled triple tubular types with external heat media (such as outdoor air). In the 2nd supercooling heat exchanger 9; The gas refrigerant after the evaporation gasification is supplied with through the suction side that low-pressure gas pipe arrangement 12 supplies to compressor 1A, 1B.The temperature sensing tube 10a of described temperature-sensitive expansion valve 10 is installed on the described low-pressure gas pipe arrangement 12.

In described idle call refrigerant loop A, being provided with can only be at the electromagnetic opening and closing valve 13 of not making opening action when the 2nd supercooling heat exchanger 9 parts are supplied with liquid refrigerant.In this example, heat source side heat exchanger 3 and the 1st supercooling heat exchanger 8 shared above-mentioned outdoor fans 11.

At the entrance side of described accumulator tank 7, setting has the bridge circuit 14 of 4 check valve 14a-14d.This bridge circuit 14 plays the effect of following stream switching mechanism: will import accumulator tank 7 from the liquid refrigerant of heat source side heat exchanger 3 when cooling operation, will be imported by expansion valve 4 backs from the liquid refrigerant footpath of accumulator tank 7 simultaneously and use side heat exchanger 5; When heating running, will import cylinder 7 from the liquid refrigerant that uses side heat exchanger 5, will import heat source side heat exchanger 3 via expansion valve 4 backs from the liquid refrigerant of accumulator tank 7 simultaneously.

In described idle call refrigerant loop A, be provided with the check valve 15 that can only when cooling operation, allow liquid refrigerant to circulate to accumulator tank 7 from heat source side heat exchanger 3, and, also be provided with electromagnetic opening and closing valve 16.This electromagnetic opening and closing valve 16 is made opening action when heating running, allow cold-producing medium to circulate to use side heat exchanger 3 from expansion valve 4, and makes closing motion when the recuperation of heat running that heats, and can only allow cold-producing medium to circulate with evaporimeter 6 to refrigeration from expansion valve 4.

At described refrigeration upstream side liquid pipe 17 places of the refrigeration of refrigerant loop B, the heat-exchangers of the plate type 19 that the discharge gas refrigerant with cooling compressor 18 among the cooling refrigerant loop C described later carries out heat exchange is installed with evaporimeter 6.

Described cooling refrigerant loop C is formed by connecting cooling compressor 18, described heat-exchangers of the plate type 19, temperature-sensitive expansion valve 20, cooling evaporimeter 21 and accumulator 22 in order by refrigerant piping.

Between described use side heat exchanger 5 and described bridge circuit 14, the reversible circulation mechanism 23 that is made up of the series loop 23a of electromagnetic opening and closing valve 24 and the check valve 25 that can only just allow the cold-producing medium circulation when the cooling operation and electromagnetic opening and closing valve 26 and the series loop 23b that can only just allow the check valve 27 of cold-producing medium circulation when heating running is installed.In addition, in described reversible circulation mechanism 23, be provided with the capillary 28 that the tapping of circuitous electromagnetic opening and closing valve 26 is used.

With in the refrigerant loop 13, be provided with the bypass circulation 29 of circuitous described refrigeration in described refrigeration with evaporimeter 6.In this bypass circulation 29, the electromagnetic opening and closing valve 30 that can only just make opening action when refrigeration shuts down with evaporimeter 6 is installed.

Again, use among the refrigerant loop B, be provided with the electromagnetic opening and closing valve 31 that when refrigeration shuts down with evaporimeter 6, just to make closing motion in described refrigeration.In described cooling refrigerant loop C, be provided with the electromagnetic opening and closing valve 32 that when cooling evaporimeter 21 shuts down, just to make closing motion.

Again, on described use side heat exchanger 5, be provided with indoor fan 33, be provided with refrigeration on evaporimeter 6 with fan 34, on described cooling evaporimeter 21, be provided with cooling fan 35 in described refrigeration.

On the discharge pipe 47 of described compressor 1A, 1B, be provided with the oil eliminator 36 that the lubricating oil that comprises in the divided gas flow cold-producing medium is used.Be back to the suction line 38 of compressor 1A, 1B through drainback passage 37 by these oil eliminator 36 separated lubricating oil.In this drainback passage 37, be provided with the electromagnetic opening and closing valve 39 of when oil return, making opening action.

In the discharge side of described compressor 1A, 1B, be provided with and detect this compressor 1A again,, the 1B discharge pressure is the pressure sensor 40 that plays the effect of high-pressure checkout gear of high-pressure.Described refrigerating plant has the temperature sensor 41 that detects indoor air temperature, and in the discharge side of described compressor 1A, 1B, be provided with and detect the discharge temperature sensor 42 of discharging the gas refrigerant temperature, in the suction side of described compressor 1A, 1B, be provided with and detect the pressure sensor 43 that sucks gas refrigerant pressure.Described refrigerating plant has the extraneous air temperature sensor 44 that detects external air temperature.In described idle call refrigerant loop A and cooling refrigerant loop C, be provided with locking-valve 45,46.

In the refrigerating plant of said structure, can obtain following action effect.

(I) cooling operation

At this moment, four-port conversion value 2 is changed shown in the solid line of Fig. 6 like that, electromagnetic opening and closing valve 13 is made opening action, electromagnetic opening and closing valve 16 is made closing motion, electromagnetic opening and closing valve 24 is made opening action, and electromagnetic opening and closing valve 26 is made closing motion, and electromagnetic opening and closing valve 30 is made closing motion, electromagnetic opening and closing valve 31,32 is made opening action, and electromagnetic opening and closing valve 39 is made opening action.

In idle call refrigerant loop A, the gas refrigerant of discharging from compressor 1A, 1B passes through check valve 15 and bridge circuit 14 and is admitted to accumulator tank 7 the heat source side heat exchanger 3 of condenser effect behind the condensation liquefaction.From the liquid refrigerant of the liquid phase portion of this accumulator tank 7 in the 1st supercooling heat exchanger 8 through with the heat exchange of outdoor air after by supercooling.If need further supercooling, promptly when electromagnetic opening and closing valve 13 is made opening action, supercooling liquid refrigerant from described the 1st supercooling heat exchanger 8 is the part of this supercooling liquid refrigerant in the 2nd supercooling heat exchanger 9, and utilizes by the evaporation latent heat of temperature-sensitive expansion valve 10 post-decompression gas-liquid mixed refrigerants by further supercooling.Described liquid refrigerant supplies to through expansion valve 4 decompressions and uses side heat exchanger 5 to evaporate, and the evaporation latent heat of acquisition just can be used for cooling Cooling and Heat Source.Then, described back flow of refrigerant is to compressor 1A, 1B.

Again, use among the refrigerant loop B in refrigeration,, supply to refrigeration again through heat-exchangers of the plate type 19 and evaporate with evaporimeter 6 from described idle call refrigerant loop A branch through described expansion valve 4 post-decompression cold-producing mediums, the evaporation latent heat of acquisition just can be used for refrigerating uses Cooling and Heat Source.Then, described back flow of refrigerant is to compressor 1A, 1B.

In addition, in cooling refrigerant loop C, the gas refrigerant of discharging from cooling compressor 18 the heat-exchangers of the plate type 19 that plays the condenser effect, with refrigeration with forming condensation liquefaction after the liquid refrigerant heat exchange of flowing through liquid pipe 17 among the refrigerant loop B.Then, condensed liquid refrigerant supplies to cooling evaporimeter 21 through expansion valve 20 decompressions and evaporates, and the evaporation latent heat of acquisition just can be used for the freezing Cooling and Heat Source of using.Then, described cold-producing medium is back to compressor 18 through accumulator 22.

But at the storehouse temperature of refrigeration, refrigeration when higher, for prevent to refrigerate, freezing ventilation, preferably allow indoor fan 33 low-speed runnings.

(II) heats running

At this moment, four-port conversion value 2 is changed shown in the dotted line of Fig. 6 like that, electromagnetic opening and closing valve 13 is made opening action, electromagnetic opening and closing valve 16 is made closing motion, electromagnetic opening and closing valve 24 is made closing motion, and electromagnetic opening and closing valve 26 is made opening action, and electromagnetic opening and closing valve 30 is made closing motion, electromagnetic opening and closing valve 31,32 is made opening action, and electromagnetic opening and closing valve 39 is made opening action.

In idle call refrigerant loop A, the gas refrigerant of discharging from compressor 1A, the 1B liquefaction that during playing the use side heat exchanger 5 of condenser effect, is condensed, the condensation latent heat of acquisition just can be used for heating thermal source.Then, described liquid refrigerant is admitted to accumulator tank 7 through check valve 15 and bridge circuit 14, from the liquid refrigerant of the liquid phase portion of this accumulator tank 7 in the 1st supercooling heat exchanger 8 with the outdoor air heat exchange by supercooling.If need further supercooling, promptly when electromagnetic opening and closing valve 13 is made opening action, from the supercooling liquid refrigerant of described the 1st supercooling heat exchanger 8 in the 2nd supercooling heat exchanger 9 be this supercooling liquid refrigerant one that part of, and utilize by the evaporation latent heat of temperature-sensitive expansion valve 10 post-decompression gas-liquid mixed refrigerants by further supercooling.Then, described liquid refrigerant supplies to evaporimeter 6 by expansion valve 4 decompressions and process refrigeration with the heat-exchangers of the plate type among the refrigerant loop B 19 and evaporates, and the evaporation latent heat of acquisition just can be used for the refrigeration Cooling and Heat Source.Then, described back flow of refrigerant is to compressor 1A, 1B.

In addition, in cooling refrigerant loop C, the gas refrigerant of discharging from cooling compressor 18 the heat-exchangers of the plate type 19 that plays the condenser effect, with refrigeration with the liquefaction that is condensed after the liquid refrigerant heat exchange of flowing through liquid pipe 17 among the refrigerant loop B.Then, described liquid refrigerant supplies to cooling evaporimeter 21 through expansion valve 20 decompressions and evaporates, and the evaporation latent heat of acquisition just can be used for the freezing Cooling and Heat Source of using.Then, described cold-producing medium is back to compressor 18 through accumulator 22.

As mentioned above, in this example, being used as the used heat that refrigerates with Cooling and Heat Source when heating running in the evaporimeter 6 of refrigeration with refrigerant loop B can reclaim as heating thermal source in using side heat exchanger 5.At this moment, 1 among compressor 1A, the 1B shuts down.In other words, compressor capacity weakens.

Yet, heating load hour, promptly in the difference of design temperature and room temperature hour, the refrigeration in the evaporimeter 6 is with the thermal source a bit deficiency that seems.For this reason,, make electromagnetic opening and closing valve 16 make opening action simultaneously, make heat source side heat exchanger 3 play the condenser effect and get final product as long as four-port conversion value 2 is transformed into the cooling operation side carries out kind of refrigeration cycle.In addition, in the running of this kind of refrigeration cycle, in case heating load strengthens, when being the difference increase of design temperature and room temperature, as long as with four-port conversion value 2 be transformed into heat the running side heat circulation, make electromagnetic opening and closing valve 16 make closing motion simultaneously, use side heat exchanger 5 to play the condenser effect, return to and heat the recuperation of heat running and get final product.

In addition, in heating running, when refrigeration load and chilled load diminish, in other words, when the suction pressure of compressor 1A, 1B is a low pressure when reducing,, then can use the power balance between side heat exchanger 5 and the evaporimeter 6 if the air quantity of indoor fan 33 reduces automatically.

And, in heating running, when the refrigerating load diminishes, in other words, when the suction pressure of compressor 1A, 1B is a low pressure when reducing, owing to use the thermal source that heats in the side heat exchanger 5 to seem not enough, therefore, as long as electromagnetic opening and closing valve 16 is opened, allow heat source side heat exchanger 3 play the evaporimeter effect and get final product.

In addition, when indoor fan 33 stops to drive, that is, when using side heat exchanger 5 to shut down,, heat the recuperation of heat running automatically if the temperature of the not enough regulation of room temperature also can be transformed into four-port conversion value 2 and heat the running side, and electromagnetic opening and closing valve 16 is closed.

In this example, as shown in Figure 7, described suction line 38 is positioned at the suction inlet 50A of described compressor 1A, 1B, the below of 50B.Described drainback passage 37 is near described the 1st compressor 1A (being compressor capacious) suction inlet 50A, be connected with described suction line 38, on described oil equalizing pipe 48, the electromagnetic opening and closing valve 49 of making closing motion when shutting down for certain 1 among described compressor 1A, the 1B is set again.In addition, in described drainback passage 37, be provided with filter 51.

As shown in Figure 3, described compressor 1A, 1B and electromagnetic opening and closing valve 39,40 are opened and closed (ON/OFF) action.Among the figure, O is for opening, and X is for closing.

That is, described idle call refrigerant loop A has the distributor gear R that refrigerating machine oil is turned back to compressor 1A, 1B.This distributor gear R distributes the refrigerating machine oil in the cold-producing medium of idle call refrigerant loop A circulation according to the different capacity of each compressor 1A, 1B to each compressor 1A, 1B.The distributor gear R of this example makes this refrigerating machine oil be back to compressor 1A, 1B according to the principle that the refrigerating machine oil in the cold-producing medium of refrigerant loop A circulation is distributed to other compressor 1B from the compressor 1A of heap(ed) capacity.

Specifically, described distributor gear R has described oil equalizing pipe 48, oil eliminator 36 and drainback passage 37.The structure of described distributor gear R is the 1st compressor 1A that the refrigerating machine oil that comprises in the suction gas refrigerant of the refrigerating machine oil that will be separated by described oil eliminator 36 and described compressor 1A, 1B preferentially is back to heap(ed) capacity.

Adopt said structure, when compressor 1A, 1B turned round together, electromagnetic opening and closing valve 39,49 was made opening action together.The refrigerating machine oil F that is separated by oil eliminator 36 turns back to suction line 38 through drainback passage 37, and the refrigerating machine oil F in sucking gas refrigerant is back to compressor 1A, 1B separately along with suction pressure.

At this moment, most refrigerating machine oil F turns back to the 1st compressor 1A capacious.And, because of the interior pressure of the 1st compressor 1A capacious greater than the 2nd compressor 1B, so refrigerating machine oil F through oil equalizing pipe 48 and move to the 2nd little compressor 1B of capacity, can be back to two compressor 1A, 1B reliably.Therefore, even carry out all amounts running control of the oil of compressor alternate-running not resembling in the past, also can guarantee the refrigerating machine oil F among compressor 1A, the 1B.

And, when compressor 1A, 1B shut down together, make closing motion because of open and close valve 39, drainback passage 37 becomes non-connected state, cold-producing medium can not flow to the suction side from oil eliminator 36 when stopping so turning round.

In addition, when shutting down for certain 1 among compressor 1A, the 1B, open and close valve 49 is made closing motion, and the refrigerating machine oil F of process oil equalizing pipe 48 just can not move.The result is, forbids that the compressor of refrigerating machine oil F from running moves to the compressor of running halted state, can not make compressor in the running produce the deficiency of refrigerating machine oil F.

In addition, be positioned at the suction inlet 50A of compressor 1A, 1B, the below of 50B owing to connect the suction line 38 of compressor 1A, 1B, therefore, shut down and during the little compressor 1B of capacity running, can prevent that refrigerating machine oil F from flowing into compressor 1A capacious through suction line 38 at compressor 1A capacious.

The 6th example

Fig. 9 represents the suction line part in the refrigerating plant of the present invention's the 6th example.

This example is near connection 2 drainback passage 37A, 37B suction inlet 50A, 50B, so just can be back to suction inlet 50A, the 50B of the 1st compressor 1A and the 2nd compressor 1B by the refrigerating machine oil F that oil eliminator 36 separates reliably.In addition, in described drainback passage 37A, 37B, be respectively equipped with the open and close valve 39A, the 39B that when compressor 1A, 1B shut down together, make closing motion.

Like this, when compressor 1A, 1B turned round together, behind refrigerating machine oil process drainback passage 37A, the 37B by oil eliminator 36 separation, the refrigerating machine oil in sucking gas refrigerant was back to compressor 1A, 1B respectively.The result carries out oily oil return more reliably.Other structure and action effect thereof are identical with the 5th example, the Therefore, omited explanation.

Other example

In described the 1st, the 3rd and the 4th example, the refrigerating plant of 2 compressors with different capabilities is described.Yet the present invention also can have 3 above compressors of different capabilities.For example, the present invention is also applicable to the refrigerating plant of 3 compressors with 3HP, 4HP, 4HP capacity or have the refrigerating plant of 3 compressors of 3HP, 4HP, 5HP capacity.

The possibility of industrial utilization

In sum, refrigerating plant of the present invention is applicable to the aircondition with a plurality of compressors, especially Be applicable to a plurality of compressors with different capabilities.

Claims (15)

1. a refrigerating plant has mutually connection and different a plurality of compressors (1A, the 1B of capacity side by side ...) refrigerant loop (A), it is characterized in that,

For the refrigerating machine oil in the cold-producing medium that makes described refrigerant loop (A) circulation according to each compressor (1A, 1B ...) different capabilities to each compressor (1A, 1B ...) distribute, be provided with and make this refrigerating machine oil turn back to compressor (1A, 1B ...) distributor gear (R).

2. a refrigerating plant has mutually connection and different a plurality of compressors (1A, the 1B of capacity side by side ...) refrigerant loop (A), it is characterized in that,

For the refrigerating machine oil in the cold-producing medium that makes described refrigerant loop (A) circulation from the compressor (1A) of minimum capacity to other compressor (1B ...) distribute, be provided with and make this refrigerating machine oil turn back to compressor (1A, 1B ...) distributor gear (R) that refluxes.

3. a refrigerating plant has mutually connection and different a plurality of compressors (1A, the 1B of capacity side by side ...) refrigerant loop (A), it is characterized in that,

For the refrigerating machine oil in the cold-producing medium that makes described refrigerant loop (A) circulation from the compressor (1A) of heap(ed) capacity to other compressor (1B ...) distribute, be provided with and make this refrigerating machine oil turn back to compressor (1A, 1B ...) distributor gear (R).

4. refrigerating plant as claimed in claim 2 is characterized in that, described compressor (1A, 1B ...) be low pressure dome chamber type compressor,

Described distributor gear (R) has and compressor (1A, 1B ...) oil equalizing pipe (109) that is communicated with and be located at described compressor (1A, 1B ...) discharge side, separate the oil eliminator (116) that the refrigerating machine oil in the discharging refrigerant is used, the refrigerating machine oil and described compressor (1A, the 1B that separate in the described oil eliminator (116) ...) the suction cold-producing medium in the refrigerating machine oil that comprises preferentially turned back to the compressor (1A) of minimum capacity.

5. refrigerating plant as claimed in claim 3 is characterized in that, described compressor (1A, 1B ...) be high pressure dome chamber type compressor,

Described distributor gear (R) has and compressor (1A, 1B ...) oil equalizing pipe (48) that is communicated with and be located at described compressor (1A, 1B ...) discharge side, separate the oil eliminator (36) that the refrigerating machine oil in the discharging refrigerant is used, the refrigerating machine oil and described compressor (1A, the 1B that separate in the described oil eliminator (36) ...) the suction cold-producing medium in the refrigerating machine oil that comprises preferentially turned back to the compressor (1A) of heap(ed) capacity.

6. refrigerating plant, have by refrigerant piping in order with a plurality of low pressure domes chamber type compressor (1A, the 1B of the different capabilities separately of connection parallel with one another ...), heat source side heat exchanger (2), the mechanism of decompressor (3), the refrigerant loop (A) that uses side heat exchanger (4) to be connected

By oil equalizing pipe (9,9 ...) make described compressor (1A 1B) is interconnected, it is characterized in that,

At described compressor (1A, 1B ...) discharge pipe arrangement (15) on, be provided with and separate discharge the oil eliminator (16) that the refrigerating machine oil in the gas refrigerant is used,

At described compressor (1A, 1B ...) suction circuit (X) in, be provided with and will suck the refrigerating machine oil that comprises in the gas refrigerant and preferentially be back to described compressor (1A, 1B ...) in the oil return mechanism (Z) of compressor (1A) of minimum capacity,

And be provided with the refrigerating machine oil after separating in the described oil eliminator (36) is back to described compressor (1A, 1B ...) in the drainback passage (37) of compressor (1A) of minimum capacity.

7. refrigerating plant as claimed in claim 6, it is characterized in that described oil return mechanism (Z) comprising: constitute described suction circuit (X) a part and with described compressor (1A, 1B ...) in the suction pipe arrangement (25) of the slightly horizontal certain-length that connects of the compressor (1A) of minimum capacity; From the 1st suck the top branch of pipe arrangement (25) and respectively with described compressor (1A, 1B) compressor (1A) compressor (1B, the 1C in addition of minimum capacity ...) connect the 2nd suck pipe arrangement (26,26 ...).

8. refrigerating plant as claimed in claim 6 is characterized in that, described oil return mechanism (Z) comprising: constitute the part of described suction circuit (X) and form the open vertical tube (27) in lower end downwards; In the face of the bottom of this vertical tube (27) and horizontal profile sectional area body (28) greater than this vertical tube (27); Be connected with this body (28) lower end and with described compressor (1A, 1B ...) in the compressor (1A) of minimum capacity connect the 1st suck pipe arrangement (25); And be connected with the sidewall of described body (28) and respectively with described compressor (1A, 1B ...) in compressor (1A) compressor (1B, the 1C in addition of minimum capacity ...) the 2nd pipe arrangement (26,26 that connects ...).

9. refrigerating plant as claimed in claim 6 is characterized in that, described oil return mechanism (Z) comprising: the part and the vertical section sectional area that constitute described suction circuit (X) suck the horizontal large diameter pipe (29) of circuit (X) greater than this; Be connected with this horizontal large diameter pipe (29) tube wall and with described compressor (1A, 1B ...) in the compressor (1A) of minimum capacity connect the 1st suck pipe arrangement (25); And with one heart shape ground in the face of the central part of described horizontal large diameter pipe (29) also respectively with described compressor (1A, 1B ...) in compressor (1A) compressor (1B, the 1C in addition of minimum capacity ...) connect the 2nd suck pipe arrangement (26,26 ...).

10. as each described refrigerating plant in the claim 7,8 and 9, it is characterized in that described drainback passage (37) and the described the 1st sucks pipe arrangement (25) and is connected.

11. refrigerating plant, has the refrigerant loop (A) that is connected by in order that each self-capacity of connection parallel with one another is the different a pair of high pressure dome chamber type compressor (1A, 1B) of refrigerant piping, four-port conversion value (2), heat source side heat exchanger (3), the mechanism of decompressor (4) and use side heat exchanger (5)

By oil equalizing pipe (48) described compressor (1A, 1B) is interconnected, it is characterized in that,

On the discharge pipe arrangement (47) of described compressor (1A, 1B), be provided with to separate and discharge the oil eliminator (36) that the refrigerating machine oil in the gas refrigerant is used,

And be provided with the drainback passage (37A) that the refrigerating machine oil after separating in this oil eliminator (36) is back to described compressor (1A, 1B) suction side,

In this drainback passage (37), be provided with the open and close valve (39) of closing when shutting down with described compressor (1A, 1B).

12. refrigerating plant, have by in order that each self-capacity of connection parallel with one another is the different a pair of high pressure dome chamber type compressor (1A, 1B) of refrigerant piping, four-port conversion value (2), heat source side heat exchanger (3), the mechanism of decompressor (4) and use side heat exchanger (5) and connect the refrigerant loop (A) that is connect

By oil equalizing pipe (48) described compressor (1A, 1B) is interconnected, it is characterized in that,

On the discharge pipe arrangement (47) of described compressor (1A, 1B), be provided with to separate and discharge the oil eliminator (36) that the refrigerating machine oil in the gas refrigerant is used,

And be provided with the drainback passage (37A, 37B) that the refrigerating machine oil after separating in this oil eliminator (36) is back to the suction side separately of described compressor (1A, 1B),

In this drainback passage (37A, 37B), be respectively equipped with the open and close valve (39A, 38B) of closing when shutting down together at described compressor (1A, 1B).

13. as each described refrigerating plant in claim 12 and 13, it is characterized in that, on described oil equalizing pipe (48), be provided with certain 1 open and close valve of closing when shutting down (49) in described compressor (1A, 1B).

14. refrigerating plant, has the refrigerant loop (A) that is connected by in order that each self-capacity of connection parallel with one another is the different a pair of high pressure dome chamber type compressor (1A, 1B) of refrigerant piping, four-port conversion value (2), heat source side heat exchanger (3), the mechanism of decompressor (4) and use side heat exchanger (5)

By oil equalizing pipe (48) described compressor (1A, 1B) is interconnected, it is characterized in that,

On the discharge pipe arrangement (47) of described compressor (1A, 1B), be provided with to separate and discharge the oil eliminator (36) that the refrigerating machine oil in the gas refrigerant is used,

And be provided with the drainback passage (37) that the refrigerating machine oil that will separate in this oil eliminator (36) is back to described compressor (1A, 1B) suction side,

On described oil equalizing pipe (48), be provided with certain 1 open and close valve of closing when shutting down (49) in described compressor (1A, 1B).

15., it is characterized in that the suction line (38) of described compressor (1A, 1B) is positioned at the below of the suction inlet (50A, 50B) of compressor (1A, 1B) as each described refrigerating plant in the claim 11,12 and 14.

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