CN1089425C

CN1089425C - Heat pump unit for air conditioning

Info

Publication number: CN1089425C
Application number: CN97102843A
Authority: CN
Inventors: 中野定康
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 1996-02-29
Filing date: 1997-02-28
Publication date: 2002-08-21
Anticipated expiration: 2017-02-28
Also published as: KR100408468B1; CN1160171A; KR970062607A; JPH09236332A

Abstract

When fresh air temperature flowing through the heat exchanger 5 is high, a driving source 1 of the compression part 2 is overloaded. An overload is reduced by reducing a flow rate of the heat operation fluid to the heat exchanger 81 by making use of a flow rate adjusting valve V1 and reducing an air volume from an air fan F1. In the case where a plurality of indoor machines 80 are disposed, those machines are subjected successively prior to the reduction of the overload from the heat exchanger 81 having lower indoor air temperatures detected by a temperature sensor D6. The reduction of the air volume are performed parallely, the flow passage is uniformly cooled from an inlet to an outlet without causing condensation.

Description

Heat pump unit for air conditioning

The heat pump effect that the present invention relates to rely on the thermal technology to make fluid makes room conditioning, for example, and the heat pump unit for air conditioning that cold, heater unit etc. moves.

As this heat pump unit for air conditioning 100 well-known structures be, for example as shown in Figure 7, the thermal source from heat source machine 10 offered be configured in indoor cooling load or heating load for example on the indoor set 80 of idle call, cool off operation or heating operation; This heat source machine 10 is made fluid by the thermal technology of pressurization in compression section 2, obtains cooling off the thermal source of usefulness, the thermal source used of air-cooling system etc. or obtain heating the thermal source of usefulness for example, for example thermal source of the thermal source used of heater unit etc.

But heat pump unit for air conditioning of the present invention also comprises the heat pump assembly that only carries out above-mentioned cooling operation, for example with cooling load as air-cooling system or be the cooling display box etc. of food etc.Also have, so-called indoor in the present invention, be meant above-mentioned cooling display box etc. included.

Among Fig. 7, the circuit pack of representing with thick line is to obtain the thermal source thermal technology to make for example pipeline of cold-producing medium of fluid, and the circuit pack of representing with fine rule is the circuit that is used for power detection signal and control signal etc.; So outdoor because heat source machine 10 generally is configured in, be also referred to as off-premises station, still, also handlebar heat source machine 10 is configured in indoor situation.Also have, general structure is by a heat source machine 10 thermal source to be supplied with an indoor set or many indoor sets.

And, utilize drive sources 1 such as engine to come the compressor of drive compression part 2 for example to change cylinder type compressor, making for example fluorine Lyons R22 of fluid for the thermal technology who obtains thermal source, pressurizes refrigerant such as R137 fluorine Lyons, fluorine Lyons, and leave the oil eliminator (figure that comes by an oil content that in compressor, is used for making the fluid hybrid working with the thermal technology, not shown), be provided on the stream conversion portion 3, by means of heat exchanger 5 described later and heat exchanger 81, finish necessary heat operation, the thermal technology of low pressureization is made fluid by holder (among the figure, not shown), be provided on the compression section 2, using engine in drive source 1 is internal combustion engine or motor etc. again.

Stream conversion portion 3 is such: cool off at indoor set 80 under the situation of moving for example air-cooling system operation, the heat exchanger 81 of indoor set 80 1 sides is connected with the heat exchanger operation like that as heat absorption, simultaneously, the heat exchanger 5 of heat source machine 10 1 sides is connected each pipeline as above-mentioned heat release like that with the heat exchanger operation; Also have, for example indoor set 80 is heated move under the heater unit ruuning situation, the heat exchanger 5 of heat source machine 10 1 sides is connected with the heat exchanger operation like that as heat absorption, simultaneously, the heat exchanger 81 of indoor set 80 1 sides is connected each pipeline as heat release like that with the heat exchanger operation; For example, be the stream switching mechanism of using the transfer valves such as cross valve of electric power control action.

Heat exchanger 5 is a kind of like this devices; The wind of the extraneous air that relies on air blast to heave, deliver on the thermal technology makes coiled pipe that fluid flows and set up on the device of a plurality of fin, rely on along direction of arrow air-supply to the extraneous air heat release or from the heat exchanger of extraneous air heat absorption; Because of itself and outdoor extraneous air carry out heat exchange, so, be commonly referred to as outdoor heat converter.

Heat exchanger 81 is and the device of heat exchanger 5 with spline structure, be the circulation that room air is provided along direction of arrow air-supply by air blast F1, when cold air moves from room air heat absorption, when the heating operation to the heat exchanger of room air heat release, because of itself and room air carry out heat exchange, so, be commonly referred to as indoor heat converter.

And when the cooling operation, heat exchanger 5 is as the condenser operation, and heat exchanger 81 moves as evaporimeter; When the heating operation, just in time opposite heat exchanger 81 is as the condenser operation, and heat exchanger 5 moves as evaporimeter.

And, in heat source machine 10 1 sides, heat source machine 10 1 side thermal technologies are done the required each several part of fluid temperature and pressure each detected value (for example, the thermal technology who rely on to detect compression section 2 makes fluid at the pressure sensor D7 of the hot operating pressure that flows out a side and detect the temperature sensor D8 of its temperature, the thermal technology returns a side as fluid in the detection compression section 2, promptly detect pressure sensor D9 that sucks a lateral pressure and the temperature sensor D10 that detects its temperature, detection thermal technology in heat exchanger 5 makes fluid intake one side and exports the temperature sensor D2 and the temperature sensor D3 of each temperature of side, detect the temperature sensor D1 of external air temperature, detect each detected value of the speed probe D11 etc. of the rotating speed of drive source 1 driving shaft in the compression section 2), and be provided to together on the control section 7 by setting each setting value that operation part 6 sets.

Also have, in indoor set 80 1 sides, each detected value that indoor set 80 1 side thermal technologies are made the temperature of fluid and object temperature etc. (for example, detection thermal technology in heat exchanger 81 makes fluid intake one side and exports the temperature sensor D4 and the temperature sensor D5 of each temperature of side, detection room air in heat exchanger 5 sucks each detected value of the temperature sensor D6 of a side temperature), and be provided to together on the control section 7 as each setting value of the design temperature of the control target of cooling operation or heating operation etc. by operation setting section 83.

Again, control section 7 and control section 82 are received and dispatched essential value mutually in each detected value of accepting and each setting value, by means of these values, control processing capacity by control section 7, the control signal of compression section 2 operations is provided on the drive source 1 from control section 7, move control, simultaneously, flow adjustment member 4 is adjusted controls such as control, this flow adjustment member 4 is adjusted the flow that the thermal technology who is sent to indoor set 80 1 sides makes fluid, also have, by the control processing capacity of control section 82, according to instruction from control section 82 itself or control section 7, flow rate regulating valve V1 and air blast F1 are adjusted control.

Control section 7 and control section 82 constitute based on the control processing capacity (hereinafter referred to as CPU) that relies on microprocessor, for example shown in Figure 8, utilize commercially available CPU board (CPU/B) 70 and constitute, each detection signal that the state that detects each several part is obtained, with 83 operations of setting operation part 6 or setting operation part and each run signal of input as the input data, 71 take out from the gateway, store in the working storage 73, simultaneously, according to these input data, be stored in program and the control data of handling handling process in the memory 72 in advance, carry out necessary control and handle, 71 outputs are used for constituting carrying out above-mentioned necessary control to handle each control signal that the each several part that obtains controls from the gateway.

Also have, the necessary time carries out the timing in handling by 74 pairs of controls of clock circuit, also as required, on display part 75, the running status of each several part, state of a control and each set condition etc. shown and constitute, again, be provided with and (for example be used for by the path 77 between control section 7 and control section 82, the cable of bus extended line or communication usefulness), transmitting-receiving control data etc. communicate to connect terminal 76, as required, for example by utilizing communication such as RS485 specification to constitute this and communicate to connect terminal 76 with the terminal that communicates to connect of IC.

Moreover, in the structure of Fig. 7, though be to 1 heat source machine 10, connect 1 indoor set 80 structure (below, be called " 1 indoor machine structure "), still, to 1 heat source machine 10, connect many indoor sets 80 structure (below, be called " many indoor machine structures ") also be that everybody is familiar with, under latter event, its structure is that the The whole control function is carried out by the control section 7 of heat source machine 10 and carried out by the centralized Control machine that branch is arranged, and this all is that everybody is familiar with.

When the cooling of aforesaid heat pump unit for air conditioning 100 moves, the compression section 2 outputs one side thermal technology who produces when surpassing set-point for the temperature of eliminating extraneous air makes the unusual temperature of fluid and rises and the caused disadvantage of increased pressure, when surpassing each set-point respectively with each detected value of the temperature sensor D3 of the temperature sensor D1 of external air temperature and adiabatic condensation temperature, turn the flow of the flow rate regulating valve V1 of an indoor side heat exchanger 81 down, simultaneously, turn the driving rotating speed of drive source 1 in the compression section 2 down, for example this structure of the rotating speed of engine or motor (below, be called the 1st conventional art) is open according to the flat 3-177758 of open patent before the applicant.

At above-mentioned " 1 indoor machine structure ", also be that the hot working capacity of heat source machine 10 and the hot working capacity of indoor set 80 are the structure situation of same capability, when the cooling operation, when external air temperature is high or the arrangement environment of heat exchanger 5 when badly turning back on the heat exchanger 5 again by the part of air blast F2 heat release air blast, heat exchanger 5 is overload because of heat release is insufficient, the pressure that compression section 2 outputs one side thermal technology makes fluid becomes too high, the safety valve action, the perhaps drive source 1 of compression section 2, be that engine or motor quit work because of overload, whole device is stopped, having produced obstacle.

Also have, under the situation of above-mentioned " many indoor machine structures ", because generally make the hot working capacity of the total of each indoor set be set at capacity about 130% greater than the hot working capacity of heat source machine 10, when for example maximum, so, when the cooling operation, when even external air temperature is relatively low, also with the above-mentioned the same overload that is, whole device is quit work, produced obstacle.

In order to eliminate above-mentioned obstacle, though as above-mentioned the 1st conventional art, following design is effectively, promptly turn the flow of the flow rate regulating valve V1 of heat exchanger 81 down, simultaneously, reduce the driving rotating speed of compression section 2 drive sources 1, still, in case the flow of the flow rate regulating valve V1 of the heat exchanger 81 that moves as evaporimeter is turned, just produces down obstacle as described below.

In a word, when the flow of flow rate regulating valve V1 is in standing state, the thermal technology of having condensed makes fluid and evaporates at leisure, evaporates, becomes the saturated gas state fully in outlet one side and discharge to outlet one side from the inlet side of heat exchanger 81, therefore, the whole fin that spreaded all in the heat exchanger 81 by the room air that ventilates in the air blast F1 heat exchanger 81 cool off fifty-fifty.

Thereby, the drying of the room airs that ventilate in the heat exchanger 81, equally also be to carry out fifty-fifty, therefore, though there is not dewfall, but, one turns the flow of flow rate regulating valve V1 down, the thermal technology makes fluid and exports in the way of a side part in no show still and just evaporated, spread all over the place that exports a side from this place backward, become the hyperthermia and superheating gaseous state and circulate, therefore, in the place of approaching to export a side, dry insufficient, so, produce dewfall, the water droplet of this dewfall causes accidents such as mouldy to indoor, dew is corrupt.

For this reason, a kind of problem has been proposed: be desirable to provide the heat pump unit for air conditioning that does not have this obstacle.

The present invention solves above-mentioned problem by following 4 kinds of structures.

The 1st kind of structure as mentioned above

The necessary thermal technology who relies on compression section pressurization does that fluid and extraneous air carry out heat exchange and the heat of condensation working fluid that condenses and obtain, be provided to room air and carry out on the heat exchanger of heat exchange, rely on the cooling operation of the above-mentioned room air cooling of evaporation, simultaneously, when above-mentioned compression section overload, in order to reduce this overload, transship in the heat pump unit for air conditioning that reduces to operate

In first kind of structure, be equipped with: rely on the above-mentioned heat of condensation working fluid flow reduce to flow in the above-mentioned heat exchanger, parallel, carry out the overload that above-mentioned overload reduces operation and reduce device with the above-mentioned room air flow that reduces to flow in the above-mentioned heat exchanger.

The 2nd kind of structure with the 1st kind of heat pump unit for air conditioning that structure is same in, be equipped with:

Surpass the 1st set-point in the scope of the 2nd set-point in above-mentioned heat exchanger entrance one side and the temperature difference that the above-mentioned thermal technology who exports a side makes fluid, the above-mentioned heat of condensation working fluid flow that reduces in the above-mentioned heat exchanger to flow, with the above-mentioned room air flow that reduces to flow in the above-mentioned heat exchanger, both are parallel, carry out the 1st overload reduction device that above-mentioned overload reduces operation; And

When the said temperature difference arrives above-mentioned the 2nd set-point, the flow by the above-mentioned room air that only reduces in above-mentioned heat exchanger, to flow, carry out the 2nd overload that above-mentioned overload reduces operation and reduce device.

The 3rd kind of structure is such: make the necessary thermal technology of compression section pressurization do that fluid and extraneous air carry out heat exchange and the heat of condensation working fluid that condenses and obtain, be provided to room air and carry out on many heat exchangers of heat exchange, cooling down operation is evaporated, carries out in dependence makes above-mentioned room air cooling, simultaneously, when above-mentioned compression section overload, the overload that reduces this overload reduces operation, in this heat pump unit for air conditioning, be equipped with:

In above-mentioned many heat exchangers, preferentially select the minimum above-mentioned heat exchanger of above-mentioned indoor air temperature, sequentially carry out low temperature that above-mentioned overload reduces operation and preferentially transship the reduction device;

Rely on above-mentioned selection and the above-mentioned thermal technology of fixed above-mentioned heat exchanger entrance one side and outlet one side makes the temperature difference of fluid and surpasses the 1st set-point in the scope of the 2nd set-point, the above-mentioned heat of condensation working fluid flow that reduces in the above-mentioned heat exchanger to flow, with the above-mentioned room air flow that reduces to flow in the above-mentioned heat exchanger, both are parallel, carry out the 1st overload reduction device of above-mentioned the 1st overload reduction operation, i.e. the 1st reduction operation; And

When the said temperature difference of fixed heat exchanger arrives above-mentioned the 2nd set-point when relying on above-mentioned selection, the flow by the above-mentioned room air that only reduces to flow in the above-mentioned heat exchanger, carry out above-mentioned the 2nd load and reduce operation, promptly carry out the 2nd the 2nd overload that reduces operation and reduce device.

The 4th kind of structure is to set up in the 3rd structure:

When the above-mentioned reduction of releasing is operated, in above-mentioned many heat exchangers, preferentially select the above-mentioned heat exchanger that above-mentioned indoor air temperature is the highest, carry out above-mentioned the 2nd reduction operation, sequentially remove the above-mentioned the 2nd and reduce operation, after this, in above-mentioned many heat exchangers, make above-mentioned indoor air temperature above-mentioned heat exchanger the highest, that carry out above-mentioned the 1st reduction operation preferential, sequentially remove the above-mentioned the 1st load that reduces operation and reduce decontrol.

In the accompanying drawings, Fig. 1～Fig. 6 provides the embodiment of the invention, and Fig. 7 and Fig. 8 provide conventional art, and each figure thes contents are as follows.

Fig. 1 is whole frame assumption diagram;

Fig. 2 is critical piece control process chart;

Fig. 3 is critical piece control characteristic figure;

Fig. 4 is whole frame assumption diagram;

Fig. 5 is critical piece control process chart;

Fig. 6 is control processing selecting method figure;

Fig. 7 is whole frame assumption diagram;

Fig. 8 is the critical piece frame assumption diagram.

1, drive source

2, compression section

The 2A compressor

The 2B reservoir

3 stream conversion portions

4 flow adjustment member

The 4A accumulator tank

5 heat exchangers

The 5C baffle plate

6 setting operation parts

7 control sections

10 heat source machines

70CPU/B

71 input/output ports

72 handle memory

73 working storage

74 clock circuits

75 display parts

76 communicate to connect terminal

77 channels

80 indoor sets

81 heat exchangers

82 control sections

83 setting operation parts

100 heat pump unit for air conditioning

The D1 temperature sensor

The D2 temperature sensor

The D3 temperature sensor

The D4 temperature sensor

The D5 temperature sensor

The D6 temperature sensor

The D7 pressure sensor

The D8 temperature sensor

The D9 pressure sensor

The D10 temperature sensor

The F1 air blast

The F2 air blast

The V1 flow rate regulating valve

The V2 flow rate regulating valve

The V3 check-valves

As example of the present invention, the embodiment of the present invention's applicable situation on above-mentioned Fig. 7 heat pump unit for air conditioning 100 is described.

Below, with Fig. 1～Fig. 6 embodiment is described.Among Fig. 1～Fig. 6, use with Fig. 7 and Fig. 8 in the part of identical symbolic representation have with Fig. 7 and Fig. 8 in prosign part identical functions.Also have, among Fig. 1～Fig. 6, the part of representing with prosign has the prosign part identical functions that illustrates among arbitrary figure with Fig. 1～Fig. 6.

[first embodiment]

At first, with Fig. 1～Fig. 3 the 1st embodiment is described.The structure of Fig. 1, provide parts such as compression section 2 in Fig. 7 structure, stream conversion portion 3, flow adjustment member 4, heat exchanger 5, air blast F2, heat exchanger 81, air blast F1 with structure more specifically, simultaneously, parts such as control section 7, control section 82, setting operation part 6, setting operation part 83 have been omitted.

Among Fig. 1, heat exchanger 5 and air blast F2 part, two groups of heat exchangers 5 dispose face-to-face, air blast F2 is clipped in its inboard, simultaneously,, rely on along the ventilation of direction shown in the arrow, can make heat exchanger 5 and extraneous air more effectively carry out heat exchange surrounding on one side with baffle plate 5C.

In addition, flow adjustment member 4 is made of flow rate regulating valve V2, check-valves V3, accumulator tank 4A, again, by control section 7 (among the figure, not shown), makes stream conversion portion 3 switching motions, under the situation of heating operation, connects the stream that dots; Under the situation of cooling operation, connect the stream of representing with solid line.

Thereby, when the heating operation, make the thermal technology do the path circulation of fluid along compressor 2A → stream conversion portion 3 → heat exchanger 81 → flow rate regulating valve V1 → accumulator tank 4A → flow rate regulating valve V2 → heat exchanger 5 → stream conversion portion 3 → reservoir 2B → compressor 2A; Also have, when the cooling operation, make the thermal technology make fluid, be the path circulation of cold-producing medium along compressor 2A → stream conversion portion 3 → heat exchanger 5 → check-valves V3 → accumulator tank 4A → flow rate regulating valve V1 → heat exchanger 81 → stream conversion portion 3 → reservoir 2B → compressor 2A.

In addition, flow rate regulating valve V1 and flow rate regulating valve V2 be, thus from the closed condition of valve to the full-gear, for example can carry out the valve that flow is adjusted with about 500 grades of step switch adjustment, for example be the driving motor-driven valve of stepper motor; In service in constant cooling, control flow rate regulating valve V1 remains in the scope of 0～1 ℃ of set-point the temperature difference (T2-T1) of the detected temperatures value T2 of the detected temperatures value T1 of temperature sensor D4 and temperature sensor D5; Promptly, carry out such control, when this temperature difference surpasses set-point, make the aperture of flow rate regulating valve V1 increase given stepping amount, input for example+1, when this temperature difference during, make the aperture of flow rate regulating valve V1 reduce given stepping amount, input for example-1 less than set-point.Moreover, because do not comprise the control action of flow rate regulating valve V2 in the control operation that the following describes, so, if flow rate regulating valve V2 is the valve that can carry out necessary operation when above-mentioned heating operation, can carries out the valve as the expansion valve action, so, even adopt the valve of other form also to be fine.

Among air blast F1 and the air blast F2 all be from the state of turning off the blast to the maximum wind power state, for example can enough about 50 grades of steppings carry out the air blast that air quantity is adjusted, for example be to have the varistructured air blast of driving voltage that relies on auto-transformer type tap 65 switchings or bidirectional triode thyristor control.

And, among Fig. 1, though not shown,, in off-premises station 10 and each indoor set 80, be equipped with by the control section 7 of Fig. 7 and Fig. 8 explanation and 82 and setting operation part 6 and 83; Carry out respectively common cooling operation and heating operation the control handling process and with structure described in above-mentioned the 1st conventional art similarly, when each detected value of the temperature sensor D3 of the temperature sensor D1 of external air temperature and adiabatic condensation temperature surpasses each set-point respectively, turn down the flow of the flow rate regulating valve V1 of an indoor side heat exchanger 81, simultaneously, the data of turning the control handling process of driving rotating speed of drive source 1 in the compression section 2 and each set-point down store into and respectively handle in the memory 72; This control processing is performed such control, the external air temperature that detects with temperature sensor D1 and with the thermal technology that pressure sensor D7 detects from compression section 2 do fluid output pressure, 1. change like that by the middle pressure variation of Fig. 3 " external air temperature/compression output pressure characteristic ", therefore, control characteristic makes it can not surpass abnormal pressure value (for example 2.6Mpa) pressure limit point PL before, and (for example 2.3～2.4Mpa) to avoid the safety valve action, and whole device is out of service.

Again, in order to reach the present invention's purpose, respectively handle in the memory 72 storing into by the program of the aftermentioned cooling operation control handling process of Fig. 2 and Fig. 3 explanation and given data, when compression section 2 or when being overload, rely on the air quantity adjustment of air blast F1 and flow rate regulating valve V1 the flow adjustment, reduce the control of overload.

[differentiation of overload]

" differentiation of overload " (for example) that Fig. 2 controls in the handling process utilizes one of following two kinds of method of discrimination to carry out.

The 1st kind of overload method of discrimination is when the detected value of pressure sensor D7 arrives the pressure limit point PL of " external air temperature/compression output pressure characteristic " among Fig. 3, promptly to differentiate compression section 2 and be overload.

The 2nd kind of overload method of discrimination is, " compressible drive rotating speed/compressible drive output characteristics " is such in the image pattern 3, the rotating speed rpm of the driving shaft of drive source 1, for example engine or the motor of compressor 2A and the relation of driving output PS, the driving output variation data of promptly obtaining in advance 2., store in advance in the processing memory 72 of control section 7; The current rotating speed rpm that is detected by speed probe D11 asks as front wheel driving output PS, simultaneously, the computing formula that each detected value that is detected by pressure sensor D7, pressure sensor D9, temperature sensor D8, temperature sensor D10 is sought essential driving force PSA, for example empirical equation stores in the processing memory 72 of control section 7 in advance; When obtain according to this computing formula the safety value that essential driving force PSA arrives above-mentioned driving output PS (for example, drive output PS 90%) limiting value PSL the time, promptly differentiate compression section 2 and be overload.

[reducing the order of overload]

Fig. 2 controls the reduction overload in the handling process, constitutes by carrying out reducing and reduce for the 2nd time two stages reduction processing for the 1st time.

In service in permanent cooling, though the temperature of the thermal technology of having condensed of flowing in the heat exchanger 81 being made fluid intake one side and the temperature of outlet one side poor, be that the temperature difference (T2-T1) of the detected value T2 of the detected value T1 of temperature sensor D4 and temperature sensor D5 for example is controlled in 0～1 ℃ the scope, but, handle in case compression section 2 becomes overload, just carry out following control: at first, carrying out the 1st time reduces, when needs reduce overload again, carry out the 2nd time and reduce.

And, in the 1st time is reduced, said temperature difference (T2-T1) is from (for example surpassing the 1st set-point TA, 1 ℃) up to the 2nd set-point TB (for example, 10 ℃) scope in, rely on flow rate regulating valve V1 aperture reduce with air blast F1 air quantity reduce control concurrently, make Fluid Volume and temperature as stable constant value with the thermal technology who returns compression section 2, reduce the overload of compression section 2.

In a word, in the 1st time is reduced, reduce somewhat excessively though the thermal technology of flowing in the heat exchanger 81 makes the flow of fluid, but since flow through heat exchanger 81 cold sinks the room air flow reduce carry out, make the thermal technology to make fluid concurrently in the stream of heat exchanger 81 way, being unlikely evaporation light, and near flowing path outlet, just end evaporation, can dewfall on the cold sink of stream latter half.

When said temperature difference (T2-T1) (for example arrives the 2nd set-point TB, 10 ℃) time, the 2nd reduction transferred in this 1st reduction, in the 2nd time is reduced, only control the reduction of air blast F1, rely on and reduce the room air flow that flows through heat exchanger 81 cold sinks, make the thermal technology make fluid incomplete evaporation light in the stream of heat exchanger 81, make the amount of fluid and temperature as stable constant value with the thermal technology who turns back to compression section 2, reduce the overload of compression section 2.

[explanation of control handling process]

Below, the control handling process of relevant Fig. 2 is described.

The control handling process is as being attached to the subprogram of master control handling process and constituting, and this master control handling process is at heat source machine 10 with indoor set 80 integrally is in permanent cooling operation and the heating running is controlled processing.Be designed to whenever through certain hour at interval (for example, every through 5 seconds), just the control handling process of moving from cooling is transferred to the control handling process of Fig. 2.

At step SP1, take out each necessary detected value data, transfer to next step SP2.

At step SP2, differentiate whether become overload by above-mentioned [differentiation of overload].When becoming overload, just transfer to next step SP3; When not becoming overload, just transfer to step SP10.

At step SP3, the temperature gap (T2-T1) that obtains according to the detected value T2 of the detected value T1 of temperature sensor D4 in each indoor set 80 1 side control section 82 and temperature sensor D5, whether do not reach the 2nd set-point TB (promptly, do not reach 10 ℃), differentiate in the scope that whether is in the 1st reduction.When not reaching the 2nd set-point TB, just transfer to next step SP4; If not this situation, when promptly reaching the 2nd set-point TB, just transfer to step SP6.

At step SP4, reduce as the 1st time, 1 grade, i.e. (1 stepping) are fallen in the aperture of flow rate regulating valve V1, simultaneously, 1 grade, i.e. (1 stepping) are fallen in the air quantity of air blast F1, after this, store into the data of carrying out this intention that reduces for the 1st time in the working storage 73 of control section 7 and turn back to set step in the main control handling process.

At step SP5, whether arrive the 2nd set-point TB (that is, whether reaching 10 ℃) according to differentiating said temperature difference (T2-T1), differentiate in the scope that whether is in the 2nd reduction.When reaching the 2nd set-point TB, just transfer to next step SP6; If not this situation, when promptly becoming, just transfer to step SP7 less than the 2nd set-point TB.

At step SP6, reduce as the 2nd time, the air quantity of air blast F1 is reduced by 1 grade, i.e. (1 stepping), after this, store in the working storage 73 of control section 7 and turn back to set step in the main control handling process having carried out data that this 2nd reduction be intended to.

At step SP7, on each display part 75 that is attached on control section 7 and the control section 82, show the alarm of " overload is unusual " intention, and transfer to the step that the main control handling process abends.

At step SP10, differentiate " load allowance ", whether the load condition of promptly differentiating current compressor 2A is under the pressure limit point PL of Fig. 3 " external air temperature/compression output pressure characteristic " or is not under the limiting value SPL of Fig. 3 " compressible drive rotating speed/compressible drive output characteristics ".When " load allowance ", just transfer to next step SP11; If not this situation, when promptly consistent, just turn back to set step in the main control handling process with above-mentioned pressure limit point PL or limiting value PSL.

At step SP11, differentiate whether carrying out the 2nd reduction by step SP6.When carrying out the 2nd reduction, just transfer to next step SP12; If not this situation, just transfer to step SP14.This differentiation is differentiated by the data in the working storage 73 that is stored in control section 7 among the step SP6.

At step SP12, differentiate the releasing that reduces for the 2nd time last time, promptly differentiate by aftermentioned step SP13 remove, whether through the 1st t1 preset time (for example, through 3 fens clock times).The data storage of this differentiation by reducing to remove by the 2nd time of aftermentioned step SP13 of storage in the working storage 73 of control section 7, also by with clock circuit 74 for when this 2nd time is reduced releasing, begin time data that elapsed time carries out timing through the 1st preset time t1 differentiate.

At step SP13, reduce releasing as the 2nd time, the air quantity of air blast F1 is only increased 1 grade, i.e. (+1 stepping), after this, thisly reduce for the 2nd time in the working storage 73 that the data of removing intention store control section 7 into and turn back to step given in the main control handling process carrying out.

At step SP14; Differentiate whether carrying out the 1st reduction by step SP4.When carrying out the 1st reduction, just transfer to next step SP15; If not this situation, just turn back to step given in the main control handling process.This differentiation is differentiated according to the data in the working storage 73 that is stored in control section 7 at step SP4.

At step SP15, differentiate the releasing that reduces for the 2nd time last time, promptly differentiate from remove by aftermentioned step SP13, whether through the 2nd t2 preset time (for example, through 10 fens clock times).The data storage that this differentiation is reduced to remove by the 1st time of aftermentioned step SP16 of storage in the working storage 73 of control section 7, also by with clock circuit 74 for when the 1st time is reduced releasing, begin time data that elapsed time carries out timing through the 2nd preset time t2 differentiate.

At step SP16, reduce releasing as the 1st time, the aperture of flow rate regulating valve V1 is increased 1 grade, i.e. (+1 stepping), simultaneously, the air quantity of air blast F1 is increased 1 grade, i.e. (+1 stepping), after this, thisly reduce for the 1st time in the working storage 73 that the data of removing intention store control section 7 into and turn back to step given in the main control handling process carrying out.

[conclusion of the 1st example structure]

If the structure of above-mentioned the 1st embodiment is concluded, then constitute following the 1st kind of structure and the 2nd kind of structure.

The 1st kind of structure is that the thermal technology that relies on necessity of pressurization in the compression section 2 makes fluid and extraneous air (for example carries out heat exchange, rely on the heat exchange of heat exchanger 5) condense and the heat of condensation working fluid that obtains, be provided to carry out heat exchange with room air heat exchanger (for example, heat exchanger 81) on, rely on evaporation to make the cooling operation of above-mentioned room air cooling, simultaneously, when above-mentioned compression section 2 (for example transships, being differentiated by step SP2 is overload) time, the overload that execution reduces this overload reduces in the heat pump unit for air conditioning 100 of operation, and first kind of structure is equipped with:

For example by step SP4, the air quantity that dependence reduces flow rate regulating valve V1 is reduced in above-mentioned heat of condensation working fluid flow mobile in the above-mentioned heat exchanger 81, the air quantity of air blast F1 is turned down being reduced in the overload reduction device that the above-mentioned room air flow that flows in the above-mentioned heat exchanger 81 walks abreast and carries out above-mentioned overload reduction operation with dependence.

The 2nd kind of structure with the 1st kind of heat pump unit for air conditioning that structure is same 100 in, be equipped with:

For example by step SP3 and step SP4, at above-mentioned heat exchanger (promptly, heat exchanger 81) the above-mentioned thermal technology of inlet side and outlet one side make fluid temperature difference [for example, rely on the temperature difference (T1-T2) of the detected value of temperature sensor D4 and temperature sensor D5] surpass the 1st set-point (TA) in the scope of the 2nd set-point (TB), the flow of flow rate regulating valve V1 is turned in dependence down, be reduced in the above-mentioned heat of condensation working fluid flow that flows in the above-mentioned heat exchanger 81, the air quantity of turning air blast F1 with dependence down is reduced in the above-mentioned room air flow that flows in the above-mentioned heat exchanger 81, and both walk abreast and carry out the 1st overload reduction device that above-mentioned overload reduces operation; And

For example by step SP5 and step SP6, when said temperature poor (T1-T2) reached above-mentioned the 2nd set-point (TB), the 2nd overload that the flow that relies on the air quantity of turning air blast F1 down only to be reduced in the above-mentioned room air that flows in the above-mentioned heat exchanger 81 is carried out above-mentioned overload reduction operation reduced device.

[the 2nd embodiment]

Below, with Fig. 4～Fig. 6 the 2nd embodiment is described.This 2nd embodiment makes many to the indoor set among the 1st embodiment 80, and for example No. 1 machine, No. 2 machines, No. 3 machines constitute embodiment in the heat pump unit for air conditioning 100 of " many indoor machine structures "; The places different with the 1st embodiment are, its structure is: when reducing the overload of compression section 2, preferentially select indoor air temperature in the heat exchanger 81 of each indoor set 80 minimum, sequentially carry out that the 1st overload reduces and the 2nd overload reduces, simultaneously, when removing the overload reduction, in the preferential heat exchanger 81 of selecting each indoor set 80 indoor air temperature the highest, sequentially after carrying out the releasing that the 2nd overload reduce, carry out the releasing that the 1st overload reduces; Handle in order to carry out control, rely on the program of control handling process shown in Figure 5 and the data of set-point all to store in the processing memory 72 of control section 7 according to this differentiation.

[explanation of control handling process]

Below, the control handling process of relevant Fig. 5 is described.

The place that the handling process of Fig. 5 is different with the control handling process of Fig. 2 is: in the control handling process that execution graph 5 left sides overloads reduces, be used for preferentially selecting the step SP2A of the heat exchanger 81 indoor air temperature the lowests of each indoor set 80; Be used for to selected heat exchanger 81 differentiate whether carry out reduce for the 1st time or, whether carry out the 2nd time and reduce step SP3A and step SP5A.

Also be: reduce in the control handling process of removing in execution graph 5 right sides overloads, be used for preferentially selecting the heat exchanger 81 indoor air temperature sopranos' of each indoor set 80 step SP12A and step SP15A.

Thereby here, only explanation is about the position of these steps SP2A, step SP3A, step SP5A, step SP12A, step SP15A, the explanation of omitting other step.

Moreover, rely on the control of step SP2A, step SP3A, step SP6A to handle, be used for carrying out for example selection and the control of Fig. 6 " the selection control tricks of the trade of minimum temperature indoor set " class.

At step SP2A, be chosen in the lowest of the indoor air temperature value TC that detects with temperature sensor D6 in each heat exchanger 81, and transfer to step SP3A.Under the situation that has identical many heat exchangers 81 of temperature value TC, select temperature gap (T2-T1) little here.

If this selection tricks of the trade are described with Fig. 6, be exactly (for example) in the 1st stage of reducing the stage, select No. 1 minimum machine of temperature value TC; Similarly, in the 2nd stage, select No. 2 machine; In the 3rd stage, select No. 2 machine; In the n stage, select No. 1 machine; In (n+1) stage, select No. 2 machine; In (n+2) stage, select No. 2 machine.

At step SP3A, differentiate at the selected heat exchanger 81 of step SP2A whether carry out the 1st reduction.If carry out the 1st reduction, then transfer to next step SP4; If not this situation, then transfer to step SP5A.Here be that temperature difference (T2-T1) is surpassed the 1st set-point TA (for example, 1 ℃) and do not reach the 2nd set-point TB (for example, 10 ℃ of less thaies) and differentiate because reduce for the 1st time, so, just become differentiation whether therewith scope conform to.

If this selection tricks of the trade are described with Fig. 6, be exactly (for example) in the 1st stage of reducing the stage, the temperature difference of No. 1 machine is 1.5 ℃, because do not reach the 2nd set-point TB (that is, 10 ℃ of less thaies), so, conform to the target that reduces for the 1st time; Similarly, the 2nd stage No. 2 machines, No. 2 machines in the 3rd stage, No. 2 machines in (n+1) stage become conforms to the target that reduces for the 1st time.

At step SP5A, differentiate at the selected heat exchanger 81 of step SP2A whether carry out the 2nd reduction.If carry out the 2nd reduction, then transfer to next step SP6; If not this situation, then transfer to step SP7.Here be temperature difference (T2-T1) to be arrived the 2nd set-point TB (for example, 10 ℃) differentiate because reduce for the 2nd time, so, just become differentiation whether therewith scope conform to.

If this selection tricks of the trade are described with Fig. 6, exactly (for example) to reduce the temperature difference of n stage No. 1 machine in stage be 10 ℃ because arrive the 2nd set-point TB (for example, 10 ℃), so, and reduce target the 2nd time and conform to; Similarly, No. 2 machines in (n+2) stage become and reduce target the 2nd time and conform to.

At step SP12A, select the highest heat exchanger 81 of temperature difference (T2-T1), and transfer to next step SP13.

At step SP15A, select the highest heat exchanger 81 of temperature difference (T2-T1), and transfer to next step SP16.

[conclusion of the 2nd example structure]

If the formation of above-mentioned the 2nd embodiment is concluded, then constitute following the 3rd kind of structure and the 4th kind of structure.

The necessary thermal technology who pressurizes in the dependence compression section 2 makes fluid and extraneous air (for example carries out heat exchange, the heat exchange of dependence heat exchanger 5) heat of condensation working fluid that condenses and obtain, be provided to carry out heat exchange with room air heat exchanger (for example, many heat exchangers 81) on, carry out the cooling operation that makes above-mentioned room air cooling by evaporation, simultaneously, when above-mentioned compression section 2 (for example transships, being differentiated by step SP2 is overload) time, carry out the overload that this overload is reduced and reduce in the heat pump unit for air conditioning 100 of operation, the 3rd kind of structure is equipped with:

For example by step SP2A, the above-mentioned indoor air temperature of preferential selection (for example in above-mentioned many heat exchangers 81, the temperature value TC that detects with Temperature Detector D6) minimum above-mentioned heat exchanger 81 is sequentially carried out low temperature that above-mentioned overload reduces operation and is preferentially transshipped the reduction device;

For example by step SP3A, the temperature difference of making fluid according to the above-mentioned thermal technology of selected above-mentioned heat exchanger 81 inlet sides of above-mentioned selection and outlet one side [for example, the temperature gap (T1-T2) that relies on temperature sensor D4 and temperature sensor D5 to detect] surpass the 1st set-point (TA) in the scope of the 2nd set-point (TB), the flow of turning flow rate regulating valve V1 down is to reduce the above-mentioned heat of condensation working fluid flow that flows in the above-mentioned heat exchanger 81, with the air quantity of turning air blast F1 down to be reduced in the above-mentioned heat exchanger 81 the above-mentioned room air flow that flows, both are parallel, carry out the 1st aforementioned overload and reduce operation, promptly carry out the 1st the 1st overload that reduces operation and reduce device; And

For example by step SP5A, when the said temperature poor (T1-T2) according to the selected heat exchanger 81 of above-mentioned selection arrived above-mentioned the 2nd set-point (TB), the air quantity by turning air blast F1 down was with the flow that is reduced in the above-mentioned room air that flows in the above-mentioned heat exchanger 81 and carry out the 2nd aforementioned overload and reduce operation, promptly carry out the 2nd the 2nd overload that reduces operation and reduce device.

The 4th kind of structure is to set up in this 3rd structure:

When removing above-mentioned reduction, for example by step SP11, step SP12A, step SP13, the above-mentioned heat exchanger 81 that the above-mentioned indoor air temperature of preferential selection is the highest in above-mentioned many heat exchangers 81, execution the above-mentioned the 2nd reduces operation, sequentially remove the above-mentioned the 2nd and reduce operation, after this, by step SP14, step SP15A, step SP16, in above-mentioned many heat exchangers 81, make above-mentioned indoor air temperature above-mentioned heat exchanger 81 the highest, that carry out above-mentioned the 1st reduction operation preferential, sequentially remove the above-mentioned the 1st load that reduces operation and reduce decontrol.

[distortion is implemented]

The present invention includes following distortion implements.

(1) is applicable to the structure of only carrying out on the heat pump unit for air conditioning that cools off operation.

If according to the present invention, even then at the mobile external air temperature height of heat source machine one side heat exchanger, under the operating condition that compression section transships easily during the cooling operation, because the thermal technology of flowing in indoor set one side heat exchanger makes the temperature difference of fluid and expands to the set-point bigger than stable constant value, simultaneously, reducing the thermal technology of flowing in this heat exchanger makes fluid flow and reduces the room air flow, both parallel overloads that reduce, and then, after arriving above-mentioned set-point, only be reduced in room air flow mobile on this heat exchanger to reduce the overload of compression section, therefore can carry out suitable overload and reduce large-scale overload.

Also have, because the thermal technology of flowing in the reduction heat exchanger makes fluid flow and reduces the room air flow, both are parallel, also because the thermal technology does the evaporation of fluid equally to carry out to outlet fifty-fifty from heat exchanger entrance, so be characterized in to be provided at the heat pump unit for air conditioning that on close heat exchanger outlet one Hindquarter part, does not produce dewfall when transshipping.

Claims

1, a kind of heat pump unit for air conditioning, it is that the necessary thermal technology that relies on compression section pressurization does that fluid and extraneous air carry out heat exchange and the heat of condensation working fluid that condenses and obtain, it is provided to room air carries out on the heat exchanger of heat exchange, and rely on evaporation, make above-mentioned room air cooling and the cooling down operation that carries out, simultaneously, when above-mentioned compression section overload, carry out the heat pump unit for air conditioning that overload reduces operation for reducing this overload;

This heat pump unit for air conditioning is characterized by:

Be equipped with reduce the above-mentioned heat of condensation working fluid flow that flows in the above-mentioned heat exchanger, be reduced in the above-mentioned room air flow that flows in the above-mentioned heat exchanger, both are parallel, carry out the overload that above-mentioned overload reduces operation and reduce device;

Surpass the 1st set-point in the scope that arrives the 2nd set-point in above-mentioned heat exchanger entrance one side and the temperature difference that the above-mentioned thermal technology who exports a side makes fluid, reduce the above-mentioned heat of condensation working fluid flow that flows in the above-mentioned heat exchanger and reduce the above-mentioned room air flow that flows in the above-mentioned heat exchanger, both are parallel, carry out above-mentioned overload and reduce the 1st overload reduction device that the 1st overload of operating reduces operation; And

When the said temperature difference arrives above-mentioned the 2nd set-point, the flow by only reducing the above-mentioned room air that flows in the above-mentioned heat exchanger, carry out the 2nd overload that the 2nd overload that above-mentioned overload reduces operation reduces operation and reduce device.

2, heat pump unit for air conditioning as claimed in claim 1 is characterized in that:

It also is equipped with:

Many described heat exchangers; With

In above-mentioned many heat exchangers, preferentially select the minimum above-mentioned heat exchanger of above-mentioned indoor air temperature, sequentially carry out low temperature that above-mentioned overload reduces operation and preferentially transship the reduction device.

3, heat pump unit for air conditioning as claimed in claim 2 is characterized in that:

It also is equipped with:

When the above-mentioned overload of releasing reduces operation, in above-mentioned many heat exchangers, preferentially select the above-mentioned heat exchanger that above-mentioned indoor air temperature is the highest, carry out above-mentioned the 2nd overload reduction operation, sequentially remove the above-mentioned the 2nd and reduce operation, after this, in above-mentioned many heat exchangers, make above-mentioned indoor air temperature above-mentioned heat exchanger the highest, that carry out above-mentioned the 1st reduction operation preferential, sequentially remove the load reduction decontrol that above-mentioned the 1st overload reduces operation.