CN2279274Y

CN2279274Y - Freezing air and feezing tube controlling apparatus for refrigerating van

Info

Publication number: CN2279274Y
Application number: CN 96223084
Authority: CN
Inventors: 萧嘉龙
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-09-27
Filing date: 1996-09-27
Publication date: 1998-04-22
Anticipated expiration: 2006-09-27

Abstract

The utility model relates to a control device for a freezing-air pipeline and a freezing pipeline for a freezing vehicle, which comprises a pressure detection control element and a control circuit, wherein, the pressure detection control element is connected to the output end of a freezing evaporator in a freezing loop in order to detect the pressure of cooling media in a freezing pipeline; the control circuit comprises a freezing electromagnetic valve coil and a freezing-air electromagnetic valve coil. The high-pressure and the low-pressure control points and the common contact point of a pressure detection device are respectively connected to a radiator fan, the freezing electromagnetic valve coil and the freezing-air electromagnetic valve coil of a cooling-medium compressor. According to the high pressure and the low pressure of the cooling media in the freezing pipeline, the pressure detection control element controls the starting operation of the freezing-air electromagnetic valve on the freezing loop, so that the pressure of the cooling media in the freezing-air pipeline is regulated in time.

Description

Van cooler cold air and freezing pipe controller

The utility model belongs to refrigerating apparatus, relates in particular to a kind of van cooler cold air and freezing pipe controller.

General commonly used Ice and the freezing fresh van cooler of transporting, the freezing pipeline system and the cooling pipelines system that comprise a parallel with one another and shared compressor and radiator fan, freezing pipeline system is used for the kinds of goods reefer of car back, the cooling pipelines system is used for the cold air conditioner device in the van cooler operator's compartment, this van cooler uses the problem of meeting often to be, behind the car under the vacant situation of reefer, use when driving indoor air conditioner separately, because of reefer need not freezing pipeline and compressor chamber be inaccessible not on-state, but cooling pipelines and compressor chamber are conducting state, when cooling media circulates in cooling pipelines, also can flow and accumulate in the evaporator mouth in the freezing pipeline, this is to be located at due to the evaporator end because of common cooling media control cock, cooling media can't be back in the compressor in good time like this, the cooling media amount of circulation in the cooling pipelines is limited to some extent, thereby cause the air-conditioning effect in the operator's compartment bad.

The purpose of this utility model is to provide a kind of van cooler cold air and freezing pipe controller, it utilizes the pressure height of pressure detection control setup according to cooling media in the freezing pipeline, and the freezing electromagnetic valve of control refrigerating circuit moves in good time, in time the cooling media with the pipeline inner accumulated disengages to compressor, and the effect when making cold air conditioner in the independent use operator's compartment improves.

The utility model adopts following technical scheme:

Van cooler cold air of the present utility model and freezing pipe controller, comprise cooling pipelines and freezing pipeline in parallel, cooling pipelines is made up of cold air evaporator series cold air electromagnetic valve, connect freezing electromagnetic valve of freeze pipe route refrigerating evaporator is formed, on the mouth of the refrigerating evaporator of described freezing pipeline, connect pressure detection control element, pressure detection control element comprises height, two separate detection control elements of low pressure, its sense terminals is connected on the refrigerating evaporator mouth of freezing pipeline, and be provided with a normally closed contact and normal opened contact at least, its control circuit comprises an aux. pressure switch, one first diode and second diode, cold air electromagnetic valve coil and freezing electromagnetic valve coil, the aux. pressure switch series is coupled between the radiator of compressor set in normally closed contact one end of pressure detection control element and the van cooler, at cold air conditioner control line end, be connected with a cold air electromagnetic valve coil, cross-over connection first diode forward between cold air conditioner control line and common junction, another freezing control line connects a freezing electromagnetic valve coil, coupling end with freezing electromagnetic valve coil and freezing control line, be connected an end of normal opened contact, between this connection end point and common junction, also one second diode of cross-over connection forward.

The pressure detection control element of van cooler cold air of the present utility model and freezing pipe controller is connected the mouth of refrigerating evaporator, when chaufeur uses driving room conditioning separately, can detect the pressure condition of cooling media in the freezing pipeline at any time, height according to pressure, control freezing electromagnetic valve moves in good time, in time disengage and gather too much cooling media in the freezing pipeline to compressor, cooling media in the cooling pipelines 30 can in time be replenished, guaranteed to drive the effect of room conditioning.

Specifically narrate embodiment below in conjunction with accompanying drawing:

Fig. 1 is a pipeline system scheme drawing of the present utility model

Fig. 2 is the utility model control circuit scheme drawing

Fig. 3 is the annexation scheme drawing of the utility model pipeline system and control circuit

Shown in each figure, van cooler cold air of the present utility model and freezing pipe controller, comprise cooling pipelines 30 and freezing pipeline 10 in parallel, cooling pipelines 30 is by cold air evaporator 31 series connection cold air electromagnetic valves 32, evaporating pressure is adjusted valve 33, cold air expansion valve 34 is formed, the freezing electromagnetic valve 12 of freeze pipe route refrigerating evaporator 11 series connection, freezing expansion valve 13 is formed, the two ends of cooling pipelines 30 are in parallel with freezing pipeline 10 respectively, and be connected on the compressor set 20, form another cooling media flow cycle, on the mouth of the refrigerating evaporator 11 of described freezing pipeline 10, connect pressure detection control element 40, pressure detection control element comprises height, two separate detection control element 40A of low pressure, 40B, pressure detection control element 40 is with high, be respectively equipped with capillary tub 14 between low pressure detection control element, its sense terminals is connected on refrigerating evaporator 11 mouths and the pipeline between freezing electromagnetic valve 12 input ends of freezing pipeline 10, pressure condition with the cooling media in the freezing pipeline 10 of sensing, the mode of pressure detection control element 40 has height, two kinds of modes of low pressure, high pressure control be with high pressure sense terminal 40A be the detecting end points, just high pressure sense terminal 40A is introduced testing pressure from the front end of the refrigerating evaporator 11 of freezing pipeline 10, and be provided with a normally closed (NORMAL CLOSE at least, be called for short N.C.) contact 41, this normally closed contact 41 is normally off when pressure cooling medium is in usual state, just common junction 42 and normally closed contact 41 are conducting (ON) state, otherwise, when if the pressure cooling medium in the freezing pipeline 10 is too high, 41 of normally closed contacts and common junction 42 are (OFF) state that opens circuit, reduce to compressor 10 until pressure cooling medium and need heat-dissipation pressure, just make normally closed contact 41 keep the normally off of conducting with common junction 42 again, low pressure control be with low pressure sense terminal 40B be the detecting end points, promptly by low pressure sense terminal 40B, introduce testing pressure from the front end of the freezing electromagnetic valve 12 of freezing pipeline 10, and be provided with one at least and often open (NORMALOPEN, be called for short N.O.) contact 43, the specific pressure cooling medium value of the freezing pipeline 10 that normal opened contact 43 is imported according to the sense terminals of pressure detection control element 40 as and the conducting of common junction 42 or the control of opening circuit, promptly when the pressure cooling medium in the freezing pipeline 10 is lower than 2.5kg/cm, normal opened contact 43 keeps normally open, be that normal opened contact 43 keeps off state with common junction 42, when the cooling media in the freezing pipeline 10 is higher than 3.5kg/cm, make normal opened contact 43 and common junction 42 be conducting state, pressure cooling medium is 2.5 between 3.5kg/cm the time, be non-action state, promptly keep normal opened contact 43 and common junction 42 original conducting state or off state, when pressure cooling medium arrival is higher than 3.5kg/cm or is lower than 2.5kg/cm, relative action by normal opened contact 43 changes original conducting or off state.

Control circuit 50 comprises an aux. pressure switch 51, one the first diode D1 and the second diode D2, cold air electromagnetic valve coil 52 and freezing electromagnetic valve coil 32, aux. pressure switch 51 is series between the radiator FL of compressor set 20 in normally closed contact 41 1 ends of pressure detection control element 40 and the van cooler, the cooling media gross pressure that aux. pressure switch 51 is sent from compressor set 20 with gross pressure sense terminal 50A detecting, so as to the height of aux. pressure detecting control element 40 in compressor set 20, outside the low pressure control situation, provide compressor set 20 when the cooling media gross pressure is too high, automatically cut off the running of compressor set 20 and radiator FL, to keep the running effect of compressor set 20, at cold air conditioner control line end A/C, be connected with a cold air electromagnetic valve coil 52, cold air electromagnetic valve coil 52 is Electromagnetic Drive action sources of cold air electromagnetic valve 12, so as to being controlled by the drive signal of cold air conditioner control line A/C, at 42 of cold air conditioner control line A/C and the common junction cross-over connection first diode D1 forward, another freezing control line FZ connects a freezing electromagnetic valve coil 53, the drive actions source that freezing electromagnetic valve coil 53 is freezing electromagnetic valves 32, so as to being frozen control line FZ drive controlling, with the coupling end of freezing electromagnetic valve coil 53 with freezing control line FZ, be connected in an end of normal opened contact 43 again, at freezing control line FZ non-action state (when promptly not sending signal), make the freezing electromagnetic valve coil 53 of pressure detection control element 40 controls, 42 of same connection end point (being normal opened contact 43 1 ends) and common junction, also one second diode D2 of cross-over connection forward, isolated so as to the freezing drive signal that cooperates the first diode D1 that cold air conditioner drive signal that cold air conditioner control line A/C sent and freezing control line FZ are sent, and unlikely mutual conflict.

When van cooler carrying Ice or fresh goods, because cold air conditioner control line A/C and freezing control line FZ control the keying of cold air electromagnetic valve 12 and freezing electromagnetic valve 32 respectively, at this moment, compressor set 20 and radiator fan FL, the high pressure control mode of detection control element 40 that is stressed and the control keying of aux. pressure switch 51, and when reefer behind the car of van cooler is not started shooting use, freezing control line FZ closes naturally, do not send drive signal, but at this moment, when the van cooler chaufeur is opened the cold air conditioner equipment use of operator's saddle, cold air conditioner control line A/C then still sends the cold air conditioner drive signal, in the time of before cooling media accumulates in the input end of freezing electromagnetic valve 12, pressure detection control element 40 is just according to the low pressure control mode, be higher than 3.5kg/cm or be lower than 2.5kg/c according to force value, make normal opened contact 43 in good time and common junction 42 be conducting state, make freezing electromagnetic valve coil 53 actions, so that freezing electromagnetic valve 32 is opened, the former cooling media release that accumulates in the freezing pipeline 10 is back in the compressor set 20, like this, cooling media in the cooling pipelines 30 can in time be replenished, and has guaranteed to drive the effect of room conditioning.

Van cooler cold air of the present utility model and freezing pipe controller, reasonable in design, result of use is good, overcomes the defective that traditional product exists, and reaches design purpose.

Claims

1, a kind of van cooler cold air and freezing pipe controller, comprise cooling pipelines and freezing pipeline in parallel, cooling pipelines is made up of cold air evaporator series cold air electromagnetic valve, connect freezing electromagnetic valve of freeze pipe route refrigerating evaporator is formed, it is characterized in that, on the mouth of the refrigerating evaporator of described freezing pipeline, connect pressure detection control element, pressure detection control element comprises height, two separate detection control elements of low pressure, its sense terminals is connected on the refrigerating evaporator mouth of freezing pipeline, and be provided with a normally closed contact and normal opened contact at least, its control circuit comprises an aux. pressure switch, one first diode and second diode, cold air electromagnetic valve coil and freezing electromagnetic valve coil, the aux. pressure switch series is coupled between the radiator of compressor set in normally closed contact one end of pressure detection control setup and the van cooler, at cold air conditioner control line end, be connected with a cold air electromagnetic valve coil, cross-over connection first diode forward between cold air conditioner control line and common junction, another freezing control line connects a freezing electromagnetic valve coil, the coupling end of freezing electromagnetic valve coil and freezing control line is connected an end of normal opened contact, between this connection end point and common junction, also one second diode of cross-over connection forward.