JPS6144016A - Air conditioning equipment for car - Google Patents

Abstract

PURPOSE:To simplify construction by combining a single vacuum switch with a single three-port solenoid valve to enable switch-over in at least three modes of air conditioning by varying the combination of the opening and closing conditions, of plural blow-off ports. CONSTITUTION:A ventilation damper 6, a defroster damper 7, and a heat damper 8 are opened and closed by means of negative-pressure operated diaphragms 1 and 2, while a water valve 35 is opened and closed by means of a negative- pressure operated diaphragm 3. And, a vacuum switch B has a negative-pressure connecting port 13, an atmospheric pressure connecting port 14 which can be switchedly connected to a negative-pressure source and the atmosphere, and an all-time atmospheric-pressure connected port 15. The operation of the switch B is controlled by a power servo-diaphragm 10 in accordance with a negative pressure which is fed through a valve box C which is controlled based on the command of a car-room control amplifier 12. And, a three-port solenoid valve 16 which is shifted being interlocked with a refrigerant compressor E, is connected to the port 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air conditioning mode switching mechanism for an automotive air conditioner.

[Prior Art] Air conditioners for automobiles generally have a heat outlet for heating, a ventilation outlet for ventilation and cooling, and a windshield defrost outlet.
Both of them are equipped with three types of air conditioning hot air outlets, and by changing the opening and closing combinations of the dampers installed at each of these outlets, it can be used in different cabin modes such as heat mode, ventilation mode, and defrost mode. It is constructed so that the air blowing situation can be obtained.

In addition, the wetness of the blown air can be adjusted by changing the ratio of air passing through the heating heat exchanger and air passing through the cooling heat exchanger installed in the ventilation passage as the housing of the air conditioner. 1. A method has been adopted in which a damper called an amics damper is interposed in this ventilation path.

Automatic air conditioners, which have recently become popular, automatically switch each of the air blowing modes (air conditioning modes) mentioned above to the optimal mode according to fluctuations in outside temperature to maintain a desired constant temperature inside the vehicle. It also has a built-in mechanism that allows you to manually switch the air conditioning mode.

The damper at each outlet is opened and closed by transmitting the back and forth movement of the negative pressure diaphragm, which receives switched supply of negative pressure and atmospheric pressure, to the damper via a link mechanism. A type of multi-port air valve called a vacuum switch is used as a means of selectively switching and supplying pressure and atmospheric pressure to a diaphragm, and a rotary set or a slide type air passage switching valve body is connected to an automatic air conditioning system. The operating rod of the power revo dianorum moves back and forth in response to the fluctuating negative pressure supplied through a set of solenoid valves that operate on and off based on the output signal from the room temperature control amplifier. , configured to rotate or move back and forth.

Then, when the air conditioner is set to automatic air conditioning mode, the compressor is turned on, and the refrigeration cycle is not activated, the air temperature from each outlet is different depending on whether the air conditioner is turned on, the compressor is turned on, or the refrigeration cycle is not activated. The opening/closing timing of each blower outlet damper during the process of opening and closing must be made different between when the compressor is on and when the compressor is off, otherwise the air conditioning mode cannot be switched properly during manual operation.

Conventionally, as a method for changing the switching point of the air conditioning mode described above, a method has been adopted in which the ventilation path is switched through a switching means of a plurality of electrical contacts attached to a vacuum switch, and the connection of these electrical contacts is changed. However, the problem was that the overall structure of the vacuum switch became complicated. As another method of changing the air conditioning mode switching point, two vacuum switches 100 and 200, as schematically shown in FIG.
Two three-way switches are used to change the distribution states of the negative pressure communication ports 101.201 and atmospheric pressure communication ports 102.202 of each of the switches 100 and 200, and to switch the connection state of the negative pressure piping group connecting the two switches 100 and 200. A method of controlling the movement of the negative pressure operating diaphragm 300 using valves 103 and 203 has also been devised, but like the above method, this method has the drawbacks of increasing the number of components of the device and complicating the structure. In addition,
The lower part of this figure shows the change in the automatic air conditioning mode switching point when the refrigeration cycle is turned on or off in an automatic air conditioner using this type of vacuum switch.

[Problems to be Solved by the Invention] The present invention provides an automatic air conditioning system for automobiles in which the temperature of warm air blown out from each outlet changes by turning off the air conditioner (compressor operation) switch during automatic air conditioning mode. In order to cope with this problem, we developed an I/O device that is simpler than conventional equipment, in order to make the opening/closing timing of each outlet damper different between when the air conditioner is on and when the air conditioner is off, from the strongest heating to the strongest cooling. The purpose is to create geometric structures.

[Means for Solving the Problems] The automotive air conditioner of the present invention changes the combination of opening and closing states of each outlet using a plurality of negative pressure actuators,
In an automatic air conditioner capable of switching between at least three air conditioning modes, each of the plurality of negative pressure actuators is provided with a negative pressure communication port, an atmospheric pressure communication port, and an atmospheric pressure communication port for selectively supplying negative pressure or human pressure. A vacuum switch equipped with a communication port for switching between negative pressure and atmospheric pressure, a power servo diaphragm for driving the vacuum switch that is operated by negative pressure that fluctuates based on instructions from a vehicle temperature control amplifier, and switching of the vacuum switch. A 3-port solenoid valve for switching the communication port to negative pressure or human pressure, and a 3-port solenoid valve for communicating with the atmosphere when the compressor of the refrigeration cycle is in operation, and for bringing the 3-port solenoid valve into communication with the atmosphere when the refrigeration cycle compressor is stopped, and to communicate with the negative pressure when the compressor is stopped. said compressor and said 3
By incorporating an interlocking rock structure with a port solenoid valve, we were able to solve the problem.

[Operation and Effects of the Invention] Three ports provided in a vacuum switch for controlling the operation of a plurality of negative pressure operating diaphragms for opening and closing each outlet opening/closing damper for switching the air conditioning mode of an automotive air conditioner, that is, always Among the negative pressure communication port, constant atmospheric pressure communication port, and negative pressure to atmospheric pressure switching communication port equipped with a 3-way solenoid valve, the atmospheric pressure to negative pressure switching port is used when the refrigeration cycle is operating in automatic air conditioning mode. The automatic to manual operation switching switch is set so that the atmospheric pressure is maintained when the refrigeration cycle is stopped, and the negative pressure is maintained when the refrigeration cycle is stopped.
By linking the movement of the 3-way solenoid valve with the movement of the 3-way solenoid valve, when the refrigeration cycle is operating and stopped, the opening and closing states of each damper are changed from the strongest heating to the strongest cooling, or in other words, the air conditioning The timing of mode switching can be made different, and it is possible to eliminate the inconvenience in controlling the vehicle room temperature that the warm air temperature from each outlet is different between automatic air conditioning and automatic air conditioning.

The device of the present invention does not require the complicated combination of electrical contacts and many switches unlike conventional devices, or the hassle of using a combination of two vacuum switches and two three-way valves. Since only one vacuum switch and only one 3-port solenoid valve are required in combination, the structure of the device can be simplified and made more compact, and costs can be reduced.

[Example] In FIG. 1, which shows the overall configuration of the device of the present invention, A is the main body of the air conditioning device, and there are two interlocking panels at the entrance of the ventilation passage 20 as the device housing. damper 2
Damper and blower 2 for switching between inside and outside air, consisting of 1 and 22
3, and the outlet section is provided with a center ventilation 24, a defrost 25, a heat 26, and a side ventilation air conditioner 27, and inside the ventilation passage 20, in order from the upstream side, a cooling evaporator 28, Air mix damper 5 for temperature adjustment and heater core 29 for heating
is stored. 30 and 31 are engine cooling hot water circulation pipes.

The center ventilation outlet 24 has a ventilation damper 6, the defrost outlet 25 has a defrost damper 7, the heat 1 outlet 26 has a heat damper 8,
Further, a side ventilation converter 32 is provided at the side ventilation outlet 27. These three dampers 6.7 and 8 are interlocked with each other and are opened and closed when negative pressure or atmospheric pressure is selectively introduced into the negative pressure operating diaphragms 1 and 2. On the other hand, the dampers 21 and 22 for switching between inside and outside air are controlled to open and close by a diaphragm 34 for switching between inside and outside air, which is operated by opening and closing a solenoid valve 58 provided in the valve box C. Further, an A-tar valve 35 for intermittent inflow of engine cooling hot water into the heating heater core 29 is controlled by the negative pressure operating diaphragm 3.

Negative pressure operating diaphragms 1 and 2 and two tar valves 35 are provided for operating each damper based on a combination program of opening and closing states of each outlet damper that is preset for each mode for switching the air conditioning mode. The vacuum switch B, which has the role of selectively introducing negative pressure or atmospheric pressure into the negative pressure operating diaphragm 3 of the engine, uses a vacuum tank 9 connected to the negative pressure generation source 40 of the engine as a negative pressure supply source, and is used for automatic control of the vehicle room temperature. Two electromagnetic valves 56 in the valve box C have the function of keeping the pressure level of the negative pressure supplied from the vacuum tank 9 constant in synchronization with fluctuations in the vehicle room temperature based on commands from the control amplifier 12. .5
7 (double vacuum comb valve). D is a vacuum switch for manual switching of the air conditioning mode, and switches for switching between auto, face, pie level, foot, and defrost modes are provided.

12 is for changing the air conditioning mode of the automatic air conditioner in order to maintain the vehicle room temperature at a desired set temperature. This is a control amplifier that issues a command to operate the above-mentioned double vacuum valve on and off, which has the function of moving up and down.
, the outside temperature sensor 54, the solar radiation sensor 55, the variable resistor 51 for setting the room temperature of the air conditioner, and the potentiometer 52 for detecting the movement position of the operating frame 11 of the power servo diaphragm 10 that drives the air mix damper 5. capture.

Reference numeral E denotes a refrigerant compressor for the cooling refrigerator, which is driven by the automobile engine via a magnetic clutch 60. 61 is the activation of the magnetic clutch 60.
The off air conditioner switch 62 is an on/off switch for the 3-port solenoid valve 16, and these switches 61 and 62 are interlocked so that when the switch 61 is closed, the switch 62 is open. 63 is a battery power source.

The structure of vacuum switch B is shown in Figures 2 and 3 as a front view and side view of the valve body of the switch, Figure 4 as a back view of the switch, Figure 5 as a side view, and Figure 5 as a front view. This will be explained below with reference to FIG.

A disc-shaped rotary valve body 70 is housed between a back casing 71 and a front casing 72 of the vacuum switch B. A guide rail 73 is provided in the front casing 72 in the radial direction, and a pin 7 implanted in the operating frame 11 of the power servo diaphragm 10 is attached to the guide rail 73.
4 is slidably fitted into the front casing 72, the operating frame 11 is moved back and forth in response to fluctuations in the negative pressure supplied to the power servo diaphragm 10.
It is configured to give rotational motion to.

The valve body 70 is engaged with the front side casing 72 and rotates together, but on one side thereof there is a negative pressure communication port 1 having a shape in which a large number of arcuate spiral spaces are connected or divided in a labyrinth shape.
3. An atmospheric pressure communication port 14 and a constant atmospheric pressure communication port 15 are formed, which can be switched and connected to a negative pressure source. On the other hand, in order to maintain these three ports 13, 14, and 15 as independent airtight spaces, the inner surface of the back casing 71 of the vacuum switch B is pressed against the surface of the valve body 70 where the ports are provided. ing.

On the back side casing 71, negative pressure or atmospheric pressure is set in advance in the tap of the negative pressure supply pipe a and in the two negative pressure operating daissephrams 1 and 2 for operating each outlet damper in response to changes in the air conditioning mode. Taps are provided for the pipes c, d, and e for switching the supply according to the programmed program, and taps i for the pipe connected to the 3-port solenoid valve 16 for switching and connecting the atmosphere B communication port 14 to negative pressure or atmospheric pressure. ing. 75 is a bracket.

Next, the operation of the inventive comode will be explained based on FIG. 1. First, when performing automatic air conditioning operation, the cold tlX compressor is E's magnetic clutch 60 is turned on and automatic air conditioning starts, and the control amplifier 12 is also turned on.
Two solenoid valves are used to move the pressure level of the negative pressure of the power 4 no-vo diaphragm 10 down to F in response to changes in the temperature inside and outside the vehicle, or by turning the air conditioner temperature setting resistor. double vacuum valve) 56.57
A signal for A-on to off operation is issued. The power body diaphragm 10 moves back and forth in proportion to the fluctuation ml of this Sl 1X input, and this movement causes the power 4 body diaphragm 1
0, the J amix damper 5 rotates to adjust the mixing ratio of hot air and cold air, and the valve body 70 of the vacuum switch B is rotated. The control circuit of the control amplifier 12 is designed so that when the operating frame 11 occupies the rightmost position in this figure of its movement range, the air conditioning mode is the strongest; is set in advance.

Each outlet of an automobile air conditioner has a center penderation outlet that can blow out cold or warm air, which is directed toward the center of the vehicle interior space, a defrost outlet, which can blow out warm air, which is directed toward the center of the vehicle interior, and a defrost outlet that can blow out warm air. Generally, each heat outlet has a different blowing direction, such as towards the floor, so the means of selecting which of these outlets to blow out the conditioned air from is the so-called air conditioning mode. Regarding switching, in automatic air conditioners, the air temperature from each outlet is different when the compressor is turned on, which operates the cooling evaporator, and when it is turned off, when the cooling function is stopped and only the heating function is used. Due to these changes in conditions, the effect of switching the air conditioning mode differs between when the compressor is on and when the compressor is off. This means that when the compressor is on and off,
This creates a need to vary the switching points when the air conditioning mode is sequentially switched through several stages from the strongest heating to the strongest cooling. In the present invention, as shown at the bottom of the schematic diagram of the vacuum switch B in Fig. 1, the maximum heating (indicated by -ARM in the figure) and the strongest cooling (indicated by the CO leaf in the figure) are achieved. The air conditioning mode between is at the TO position, and when the compressor is on, it switches to three stages: heat mode, pie level mode, and pendeletion mode, and the air conditioning mode is at the AUTO position, and when it is off, it switches to heat mode. The vent mode is configured to change in two stages.

Therefore, the next step is to change the timing of switching the air conditioning mode when the compressor is on and off! The operation of the device of the present invention will be explained below. When the air conditioner switch 61 for automatic air conditioning operation is turned on and the air conditioning mode is set to the AUTO position, the 3-port solenoid valve 16 attached to the vacuum switch is activated. Since the interlocking switch 62 for vacuum switch B is placed in the off state, the three ports 13.1 of vacuum switch B
4 and 15 are connected to negative pressure, atmospheric pressure, and constant atmospheric pressure, respectively, and the air supply piping groups C to Q to the negative pressure operating diaphragms 1.2 and 3 of each outlet damper and water valve 35 are connected to atmospheric pressure or negative pressure. The state of communication with the air pressure goes through three stages of air conditioning mode switching as described above in the process of moving the vehicle room temperature setting knob from the strongest heating to the strongest cooling.

Then turn off the air conditioner switch 61 and set the air conditioning mode to A.
When set to the UTO position, the interlock switch 62 is turned on, and the 3-port solenoid valve 16 operates to communicate the atmospheric pressure communication port 14 of the vacuum switch B with the negative pressure source. As a result, in the process of operating the vacuum switch B from the strongest heating to the heating stop, the air supply pipe group C-
The state of switching connection of e to atmospheric pressure or negative pressure changes, and switching of the air conditioning mode is performed only for two modes: heat mode and vent mode. In addition to the above AIITO position, the air conditioning mode is set to the face (ventilation), pie level (B/L), heat I- (heat), and defrost (DEF>) attached to the vacuum switch D for manual switching of the air conditioning mode. By operating the respective mode switching switches, air conditioning can be performed to suit the different temperature sensations of each passenger.

In the schematic diagram of the valve body operation of vacuum switch D shown in FIG. ◎Also, a line connecting ○ marks indicates that each air supply pipe a to g is communicated via a valve body.

Table 1 shows how the air conditioning mode changes depending on the combination of operating states of the two diaphragms 1 and 2 for opening and closing each blowout rodan bar.

The ○ marks are in the operating state due to negative pressure, and the X marks are in the rest state communicating with the atmosphere to open or close the respective dampers.

Table 1 Next, in order to provide each air conditioning mode, that is, face (ventilation), pie level (B/L), foot (heat), and defrost (DEF), each outlet of the air conditioner, that is, rental ventilation. Air outlet 24, defrost outlet 25, and heat outlet 2
Table 2 shows how the two negative pressure actuated diaphragms 1 and 2 for opening and closing the dampers 6, 7, and 8 of 6 operate. In the table, the X mark means a state in which the diaphragm is in a rest state in communication with the diaphragm, and the ○ mark means a state in which the diaphragm is in communication with a negative pressure source and in operation.

Table 2 Face (Ventilation) In the IM mode, the pendeletion damper 6 opens the center vent outlet 24, and the heat damper 8 closes the vent outlet 26. On the other hand, since the defrost damper 7 and the heat damper 8 are linked together, the defrost outlet 25 is open.

At this time, the conditioned air in the ventilation passage 20 is blown out from the center ventilation outlet 24.

In the pie level (B/L) mode, the penbration damper 6 opens approximately 173 degrees, and the pi 1 to kumper 8 maintain the same state as in the face mode. The differential damper I is interlocked with the pendeletion damper 6 through a link to close the defrost outlet 25.

In the foot (heat) mode, the pendeletion damper 6 closes the center ventilation outlet 24, and the heat damper 8 closes the outlet 111 to the outlet 26. on the other hand,
The defrost damper 7G closes the defrost outlet 25.

In the defrost mode, the pendeletion damper 6 closes the center bending outlet 24, the heat damper 8 closes the heat outlet 2G, and the defrost damper 7 opens the defrost outlet 25.

The two diaphragms 1 and 2 move back and forth in response to a switching supply of atmospheric pressure or negative pressure, opening and closing the three dampers mentioned above, and each of these dampers is interconnected by a link mechanism 36. This allows the above-mentioned interlocking relationship to be maintained.

In addition, the opening/closing operation of the water valve 35 that controls the supply of engine cooling water to the heating heater core 29 is controlled by the old man of the negative pressure operating diaphragm 3, and the internal and external air V') is supplied to the air conditioner. The control of the exchange introduction goombas 21 and 22 is carried out by a solenoid valve 58 housed in the valve box C that applies negative pressure or atmospheric pressure to the opening/closing diaphragm 3 of this damper.
This is done by selectively supplying 4. The air mix damper 5 is opened and closed by a link mechanism 4T connected to the operating rod 11 of the power rib die A7 flamm 10 by P(') when the rod moves back and forth.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the overall configuration of the automotive air conditioner ζ according to the present invention, and Figs. 2 to 6 are a front view, a side view, a rear view, and a side view of the valve body of the V-comb switch, respectively. FIG. 7 is a schematic diagram of the configuration of a conventional vacuum comb switch with a mechanism for changing the air conditioning mode switching point.

Claims (1)

[Scope of Claims] 1) In an automatic air conditioner capable of switching between at least three air conditioning modes by changing the combination of opening and closing states of each outlet using a plurality of negative pressure actuators, the plurality of negative pressure actuators include: , a vacuum switch equipped with a negative pressure communication port, an atmospheric pressure communication port, and a negative pressure/atmospheric pressure switching communication port for selectively supplying negative pressure or atmospheric pressure, respectively, and based on instructions from the vehicle room temperature control amplifier. a power servo diaphragm for driving the vacuum switch that is activated by negative pressure that fluctuates in the vacuum switch; a 3-port solenoid valve for switching the switching communication port of the vacuum switch to communicate with negative pressure or atmospheric pressure; and a compressor of the refrigeration cycle. an interlocking mechanism between the compressor and the 3-port solenoid valve for bringing the 3-port solenoid valve into a state of communicating with the atmosphere when it is in operation, and bringing it into a state of communicating with negative pressure when it is stopped. air conditioning equipment.