JPS5915686A - Parallel compression type refrigerating device - Google Patents

Abstract

PURPOSE:To make it possible to sustain a satisfactory lubrication surface, by incorporating, in a refrigerating device, a circuit for rotating a motor in such a way that the direction of oil splash by one of oil splashers is made in opposite to the connection side of an equalizer pipe even if the connection of oposite phase is made upon installation or the like. CONSTITUTION:Upon, for example, the installation of a refrigerating device, in case of the connection of opposite phase in which any two of R, S and T phases of a three-phase power source and connected, conversely, a normal/opposite phase detector 25 detects this condition, and therefore, does not energize a relay 26 so that an (a) contact 31 is opened and a (b) contact 32 is closed. Accordingly, a coil 30 is energized so that the contact 28 thereof is closed, and the primary R and S phases of the three phase power source R, S, T are replaced into the secondary S and R phases thereof, respectively. Therefore, the connection of normal phase is established for motors A1, A2 of both compressors 1, 2, so that a splasher 107 is rotated by the motor A1 to splash oil in the direction opposite to an equalizer pipe 108 connecting between both compressors 1, 2. As a result, the lubrication oil surfaces of the compressors 1, 2 may be satisfactorily sustained always.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a method for compressors that are connected in parallel with each other and that can be used in simultaneous parallel operation of m refrigerant compressors, or in one-sided operation of one of the refrigerant compressors. This relates to an improvement of a parallel compression type refrigeration system designed to maintain a normal oil level (f/). Something happened. In the figure, (1) (2) almost semi-hermetic type 1 and 2 refrigerant pressure m machines, (101) (201
) ld In the crankcase that forms the above F1 and the second refrigerant compressor +11 +21 -Cc7) Both cryo'
r −, ((101) Partition wall (102) ( in (201)
202) and the suction chamber (103) (203) that houses the motor (AI) (A, 2) and the compression element (Bl) (B2).
) It is partitioned into an oil sump chamber (104) and (204) for storing all of the oil. (105) (205) Partition wall above the shore (102
) (202), the required position tjlVC is provided,
(106) (206) fJ Above partition wall (102) (20
2) This oil equalizing check valve (106) (206) is installed in the oil level equalizing hole provided with the specified value #VC.
) U From the suction chamber (103) (203) to the oil sump chamber (1
04) (204) is set so that the lubricating oil is completely allowed to flow only toward (204). (107) (207) is built into the motor (Al) (Bl) and the compression element (Bl) (B2
) Fully driven crankshaft (10g) (208) Vc equipped σne 1, compression element (Bl) (B2) σ) Oil sump chamber (,104) (204) Inner bottom part in sliding parts of bearings, etc.] The oil splasher (3) that splashes on the lubricating oil is connected to the suction chamber (103) of the first refrigerant compressor (1), and the oil splasher (3) is connected to the suction chamber (103) of the first refrigerant compressor (1). 81 not shown)v
c) Connect to the T part of the suction pipe (5) connected to the awn 1. Color 0
(41 is the above $2 refrigerant compressor (21 suction chamber (203
) K is the second gas suction pipe connected to the above suction pipe (5
It branches from the upper part of the gas suction pipe (4) and is connected in parallel with the measuring compressor +11 (21vr-). ), the separation means (501) separates the refrigerant gas in the suction pipe (5) into lubricating oil and the refrigerant gas in the suction pipe (5). , (71 is the second refrigerant compressor (21 is a gas discharge pipe, and both gas discharge pipes +61 and +71 are connected in series to a high-pressure pipe (8) connected to a condenser (not shown) of the refrigeration cycle. (9) is the first refrigerant compressor il
Between the oil equalizing hole (109) of the + oil reservoir chamber (104) and the oil equalizing hole (209) of the oil reservoir chamber (204) of the second refrigerant compressor (2)? The oil leveling pipes connected to each other are used to equalize the oil and snow (91 is installed on the way, and the check valve that allows only the compression mode (2)'\ from the compressor 11 to the line 2) is installed ○Next Please explain the operation in detail. Measurement compressor tlN21
When is being operated, @ is due to the difference in the pipe resistance of the measuring compressor + I + (21 suction pipe + 31 + 41), and the relationship between the operating pressures of the refil compressor (11 and 20th compressor (2)) is ( 1st compressor (11 suction chamber (103) pressure) - (2nd compressor (2101 suction chamber (203) pressure) = about 100~
There is one with 400 mmAg.

Or, normally, the f1 oil contains about 0.5% of the refrigerant circulation amount and the refrigerant cycle suction pipe (5) yen? It returns to the compressor Ill +21 side together with the evaporated refrigerant gas. At this time, the separation means (501) separates the refrigerant gas and the lubricating oil Segas, and most of this lubricating oil flows into the suction pipe (31) of the compressor (1) of the compressor (1) of the coil 1 due to the influence of gravity. pressure a iso +11
suction chamber (103), oil equalizing check valve (106)? Ugh, it is supplied to the oil reservoir chamber (104). Lubricating oil (, measuring compressor +1
The oil reservoir chambers (104) (204) of 1i2+ are pressure equalizing oil pipes!
To 91: Equal pressure H1 and measuring compressor il+F21
Since a differential pressure is created between the suction chambers (103) and (203) of the Wl compressor (1) as described in MU, the oil reservoir chamber (204) of the compressor (2) of 5 sets 2 is ) to flow with the gas through the oil equalizing pipe (9) and the reverse market valve 1101.
The oil is supplied to the oil reservoir chamber (204) of the compressor (2) and performs the normal lubrication function.

Next, if only the first compressor (1) is in operation 17, what is the refrigerant gas and lubricating oil a suction pipe (5) and the suction pipe (3) of the first compressor (1)? During this time, the pressure in the suction chamber (103) of compressor i11 in Sato 1 decreases to approximately 400 mmAg due to the pressure loss in the piping. Since a check valve 1101i that operates at about 100 mmAg is provided, the second
from the compressor (2) to the first pressure compressor (11 oil sump chambers (10
4), and the pressure in the oil reservoir chamber (104) is maintained at approximately the same level as the suction chamber (103) by the pressure equalization hole (105).

Therefore, the lubricant returned to the suction chamber (103)? Oil sump room (1
04), making it possible to feed into a single compressor + 1
Even after continuous operation in step 1, is the oil level still low? Stability Zaichi+! : Perform 4 driving steps.

Next, when only compressor +21 of unit 2 is operated, the suction pipe (5) F cooling evaluation gas is transferred to the suction pipe (4) of compressor (2) of unit 2.
) to the suction chamber (203), the pressure drops by about 600 mmAg due to the pressure loss in the piping during this time. Moreover, the pressure in the oil reservoir chamber (204) is also reduced by the action of the pressure equalizing hole (205) σ). On the other hand, from the lubricating oil a suction pipe tai+, the suction pipe (3) of the second compressor +I+, the suction chamber (103)
, Oil equalizing check valve (106) Th through oil sump chamber (104)
However, since the first compressor +11 is not operating, the pressure loss in the suction pipe (3) is extremely small, so the pressure P104 in the oil sump chamber (104,) of the first compressor +I+ is reduced.
The relationship between the pressure P2O4 in the oil sump chamber <2O4; of the compressor (2) t4 P1O4) P2O4,! :9, Oil IM chamber (104) of compressor fi+ of drive 1 [Due to the pressure difference of the broken oil, the oil sump chamber (204) of second compressor +21
is supplied to the unit and operates normally.

However, when the oil equalizing holes (109) and (209) are in good condition, the crank bearing of the double retraction fill 121 is located on the side when looking at the support area, and the oil splasher (
107) The compressor i
If there is an oil equalizing hole (109) on the 1111 side of l+, the first
Due to the rotation of the oil splasher (107) of the compressor 11), the oil sump chamber (104) of the compressor il+ of the Yu-1
) The oil returned to the oil equalizing hole (109), the oil equalizing pipe (9), the check valve tio+, the second compression e & (21 (1) the oil equalizing hole (2
09) 'i, r), $2 compressor (2) oil sump chamber (
204), the oil level of the compressor during operation tends to become unbalanced, and the oil level position can be checked from the oil window during maintenance. In addition, the front surface of the first compressor fl+ is lowered, leading to insufficient supply of lubricating oil to the sliding parts of the compressor, causing the compressor (1) of drive 1 to seize, The oil level in the compressor (2) of engine 2 rose abnormally, leading to a drop in refrigeration capacity due to an excessive amount of oil coming up from the compressor during operation, and there was a risk of damage to the pre-compression VC filter valve.

In order to eliminate the conventional entry point as described above, this invention will be explained below with regard to an example of this method of making a mockery of the button. M!'s Tochinari is conventionally (/1%'s [Shi-
Therefore, the explanation thereof will be omitted (...).

In the same figure, (Al)+C motor of the first compressor CI+, (A2) tl 2nd (1) compression i1121 no motor f, thickness 1 t and triple power source (R) (S)
(T). Qηe22 r;: L'X
1 % aL 2Q') Motor (Al) (A2-R operation control 1. Contact point of 1P base opening 11 of 2), ■1
The same coil as plane 1 is connected in parallel with VC in the operation circuit. (2) Three-phase turtle, source (RJ (S) (T) positive phase, three-phase 1. Source (R) (s)' to detect the negative phase
The positive and negative phase detector inserted in (T) connects the relay @ inserted in the R phase only when the phase is positive. o@@ is the 5-phase power supply (R) (S) ('r坏) phase? 1. At the contact point of the second 'II magnetic contactor, the contact is inserted into the (R) and (S) phases of the three-phase Yoigen, and the triple Ichihara's (R) and (S) phases are connected to the n2 point (C). and (S) and (R) phase jump) are inserted in the connection circuit.翰(TtT'Kg 1, 2'rl magnetic contactor coils, 1 for each operating circuit, 1 stop)
At the a contact of the I>μ relay (c), the 1st σ) W magnetic contactor (
J) It is connected in series to the coil (G). IJ at zero desire
At the b contact on the side of the wire, the second electromagnetic contactor C) fill (to)
The oaiH that is connected in series with the refrigeration cycle is
The coils (to) t2IJv of the 1st and 20th magnetic contactors are controlled by a controller such as a thermostat that responds to the position and magnitude of the load.
c Connected in series o (S~■) (0 which is a rotation switch) Next, the operation will be explained - 'r heart.

If the first compressor (1) is connected in normal phase, the operation switch (
When SW) k is turned on, this is detected by the forward/reverse phase detector cS, and the relay (A) is energized and the +7 relay (E) (7) a contact CI'l is closed, so the 1st σ)
The coil (E) of the contactor σ) is energized, and the 1 contact (rotation) of the W magnetic contactor is in the closed state. ) (A2) The state is set to supply K power. At this time, the b contact of the coil el) trx IJ relay 1) of the second electromagnetic contactor is opened, so current cannot be applied, and the contact of the Ta contactor @α
It is in the open state. Therefore, the drive 11 second compressor +l
+ (21 motor (Al) (A2) and Eli oil splasher (107) (207) The direction in which the oil is splashed is the oil equalizing pipe (91
The oil level on the side of the oil equalizing hole (109) is relatively low f, so the oil reservoir chamber (104) of the first compressor 111 rotates in the opposite direction. ) will not move more than necessary to the second compressor (2) side.

10,000, during equipment installation or service, if any two of the three-phase Ichihara (R), (S, and Ha) is this? Detected, relay (E) is energized through 1. ○This setting, relay (to) A contact OB is in open state, B contact (2)
be in a closed state. 1st σ) The coil of the electromagnetic contactor is not excited, and the contact Ivx is open, @2 electromagnetic contact/
'PI! The coil αh of the device is energized, and its contact point I is closed. difference? (-, size, primary side (S
Replace the J phase with the (R) phase on the secondary side 4) Particularly, 7.
6 Therefore, the meat compressor 111 (2+θ) motor (81) (
A2) becomes the source of V-stop and output jeA, and the motor (A
l) The 0 oil sludge (10'7) is the same as described above, where the oil flows in the direction opposite to the oil equalizing hole (108).
rotate to.

In this invention, the second compressor is passed through the first compressor.
If kl! i (how much return?+11f) In a product that takes a lot of work, even if the compressor motor wiring 7 of the installation special VC connection note 1 is connected and the phase follows, the 4-il splasher of -1 If the oil splashing way connects both sides
Ill'f;? )ja Ai 1jllll (!:
61 anti"l'J 7i same & Cfx 6, i: '
i Ka 1 compressor motor rotates 75 circuits-
01 installed, -C is required, so the second compressor should be operated at the same time; 71. In the case of the operation of the compressor in 1, the compressor's lubrication oil is
If maintained well, the reliability of the compression type can be improved, and the wiring work for the motors of three machines can be made easier during installation. 0

[Brief explanation of the drawing]

Figure 1 Log parallel compression refrigeration equipment'! Figures 4 and 2 are diagrams explaining the operation of the conventional device, Figure 31 is a circuit diagram showing an embodiment of the present invention, and Figure 4 is a diagram explaining the operation of the device of the present invention. In the figure, the compressor for +1lt2 11 or machine 2, (101
)(20], )Po crankcase, (102)(20
2) is the partition ~ (103) (203) is the suction chamber, (104
) (204J oil sump chamber, (105) (205) U equalizing hole, (106) (206) l'[oil equalizing check valve, (10
7) (207) is oil splasher, +31t41μ
First and second suction pipes, (5) is the suction pipe of the refrigeration cycle, (9) is the oil equalizing pipe, (10] is the check valve, (AI) (A
2) is the motor, (Bl) (B2) is the compression element, (c) is the positive and negative phase detector, In 1, the same code is the same or corresponds to 7 (O indicates 1i).

Claims (1)

[Claims] Is there an oil flow path only from the suction chamber side to the oil sump chamber side in the partition wall that divides the inside of the crankcase into the suction chamber side and the oil sump chamber side? A check valve that allows, a motor provided in the suction chamber and connected to a three-phase power supply, and a motor provided in the oil sump chamber, and connected to the crankshaft from the motor VC? The compression element driven through and the lubricating oil in the oil sump driven together with the crankshaft? A first compressor having an oil splasher that splashes on the sliding part of the compression element, and a first compressor fully connected to the suction chamber of the first compressor and the suction pipe of the refrigeration cycle. a suction pipe, a second suction pipe connecting the suction chamber of the second compressor and the upper part of the suction pipe of the refrigeration cycle, and connecting the two compressors in parallel together with the first suction pipe; a second suction pipe connecting the two compressors in parallel; All oil sump chambers are connected,
An oil equalizing pipe 1r having a check valve 7 that allows full flow only from the first compressor to the second compressor is provided, and the lubricating oil 7 in the refrigeration cycle is passed through the first compressor to the second compressor. The motor of the first compressor rotates in a positive phase such that the direction of oil splashing by the oil brush of the first compressor is opposite to the connection side of the oil equalizing pipe. A positive and negative phase detector detects a negative phase connection that rotates in the opposite direction of the connection, and when this positive and negative phase detector detects all positive phase connections, the motor of the first compressor continues to operate as it is. and reverse phase connection? A parallel compression type refrigeration system is provided with a control circuit which, when detected, switches two phases of the three-phase power supply, connects the motor of the first compressor to the positive phase, and operates the motor.