JPH0510020U - Air conditioner for vehicle - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an air conditioner for a vehicle that does not cause occupants to feel uncomfortable due to cold air immediately after starting operation. An oil temperature sensor 38 for detecting the temperature of hydraulic oil is provided in the second oil tank 30b of the heating circuit C2, and the temperature t detected by the oil temperature sensor 38 is set during heating and dehumidifying heating operation.
When the fan fan 44a of the radiator 35 is actuated after the value exceeds the predetermined value ta and is driven at the minimum air flow Qmin within the predetermined time T after starting, it is driven at the maximum air flow Qmax after the predetermined time T elapses. By doing so, it is possible to prevent cold air from blowing into the cabin 50 immediately after the start of the heating or dehumidifying and heating operation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is a vehicle equipped with a hydraulic circuit and a refrigeration circuit, such as a rough terrain crane. The present invention relates to a vehicle air conditioner suitable for a work vehicle.

[0002]

[Prior art]

  Generally, in the case of rough terrain crane where the cabin rotates 360 ° or more, Unlike ordinary automobiles, the engine cooling water that circulates under the cabin is introduced into the cabin. It cannot be put in, and this engine cooling water can be used as a heat source for heating. I can't come. Therefore, as an air conditioner for cooling and heating such a vehicle, as shown in FIG. The applicant has proposed what is shown (Japanese Utility Model Application No. 1-123836).

[0003]   This vehicle air conditioner includes a hydraulic circuit A and a refrigeration circuit B, and the hydraulic circuit A It is composed of a hydraulic motor drive circuit A1 and a heating circuit A2. This hydraulic motor The drive circuit A1 has an oil tank 10, a first hydraulic pump 11a and a hydraulic motor 12. Then, the hydraulic oil in the oil tank 10 is pumped up by the first hydraulic pump 11a, The hydraulic oil thus driven drives the hydraulic motor 12. Incidentally, 13 is a hydraulic motor 12. It is a safety valve that limits the pressure to.

[0004]   The heating circuit A2 includes an oil tank 10, a second hydraulic pump 11b, and a relief valve 14. , A radiator 15, and a normally open solenoid valve 16. When the solenoid valve 16 is open First, the hydraulic oil pumped up by the second hydraulic pump 11b is transferred via the solenoid valve 16 to the oil. Returning directly to the tank 10, and when the solenoid valve 16 is closed, the relief valve is opened. The working oil flows to the radiator 15 via the lube 14. In addition, each hydraulic The pumps 11a and 11b are driven by the engine of the vehicle, and various hydraulic actuations (not shown) are performed. Hydraulic oil is also made to flow to the user. Also, the relief valve 14 is an inlet. Pressure difference between the outlet side and the outlet side, causing the hydraulic oil on the downstream side to generate heat. ing.

[0005]   The refrigeration circuit B includes a compressor 20, a condenser 21, a liquid receiver 22, an expansion valve 23, and an evaporator 2. 4 are sequentially connected, and the condenser 21 and the evaporator 24 are respectively provided with the blower fan 21. Air heat is forcibly exchanged by a and 24a. In addition, the compressor 20 Is connected to the hydraulic motor 12 via a clutch mechanism 25. Furthermore, this blast fan The fan 24a is installed in an air conditioning air passage 26 that guides conditioned air into the cabin.

[0006]   In this vehicle air conditioner, the clutch device is used when heating operation is performed in winter. The connection between the hydraulic motor 12 and the compressor 20 is released by the structure 25, and the solenoid valve 1 6 is closed, and the blower fan 24a is further driven.

[0007]   At this time, in the hydraulic motor drive circuit A1, as indicated by the broken line arrow in FIG. The hydraulic oil flows to drive the hydraulic motor 12, but the compressor 20 is stopped. It In addition, the hydraulic oil pumped up by the second hydraulic pump 11b indicates the broken line arrow in FIG. As shown in FIG. 5, the relief valve 14 → radiator 15 → oil tank 10 are sequentially circulated. . Here, when the hydraulic oil passes through the relief valve 14, the inlet side of the relief valve 14 And a pressure difference occurs between the outlet side and the outlet side, and the hydraulic oil generates heat. The heat of this hydraulic oil is applied to the radiator 15 The air in the air-conditioning air passage 26 that is discharged by the blower fan 24a is heated by the blower fan 24a. . As a result, the cabin is heated.

[0008]   When the cooling operation is performed in the summer, the clutch mechanism 25 is used to press the hydraulic motor 12 and the pressure. It connects with the compressor 20 and drives the blower fans 21a and 24a. This The hydraulic oil pumped up by the first hydraulic pump 11a is indicated by the broken line arrow in FIG. As described above, the hydraulic motor 12 is circulated to drive the same. Rotational force of this hydraulic motor 12 The compressor 20 is driven by this, and the refrigerant discharged from the compressor 20 is indicated by the solid arrow. In this order, the condenser 21, the liquid receiver 22, the expansion valve 23, the evaporator 24, and the compressor 20 are sequentially cycled. Circle. As a result, the air in the air conditioning air passage 26 is cooled by the evaporator 24, and The inside of the room is cooled.

[0009]   When performing dehumidifying and heating operation during the rainy season etc., the clutch mechanism 25 is used to operate the hydraulic motor. 12 and the compressor 20 are connected, and the solenoid valve 14 is closed. Drive the motors 21a and 24a. As a result, the refrigerant discharged from the compressor 20 is cooled. As in the case of the cell operation, the air circulates as shown by the solid line arrow, and the inside of the air conditioning air passage 26 is moved by the evaporator 24. The air is dehumidified and cooled. Also, the operation pumped up by the second hydraulic pump 11b. The oil circulates as shown by the broken arrow as in the heating operation, and is conditioned by the radiator 15. The air in the air passage 26 is heated. The dehumidifying cooling by the evaporator 24 and the radiator 15 Dehumidification heating in the cabin will be performed by this heating.

[0010]

[Problems to be solved by the device]

  However, during the heating and dehumidifying heating operations, air is blown at the same time as the operation starts. The fan 24a operates, but immediately after the start of operation, the temperature of the hydraulic oil in the hydraulic circuit A is sufficiently high. Since it is not rising, warm air is not generated by the radiator 15 and cold air is blown into the vehicle. There is a problem in that the passengers feel uncomfortable.

[0011]   The present invention has been made in view of the above problems, and its purpose is to: A vehicle air conditioner that does not cause passenger discomfort due to cold wind immediately after operation Is to provide storage.

[0012]

[Means for Solving the Problems]

  In order to achieve the above-mentioned object, the present invention provides a hydraulic circuit in a hydraulic circuit according to claim 1. A relief valve that causes a pressure difference in the hydraulic oil and a pressure difference due to the pressure difference are provided on the downstream side of the pump. The radiator that radiates the heat of the generated hydraulic oil is sequentially connected, and the radiator adds heat. In an air conditioner for a vehicle in which heated air is blown into the vehicle by a blower. And means for detecting the temperature of the hydraulic oil of the hydraulic circuit, and the temperature detected by the temperature detecting means. And a control means for operating the blower when the degree of rotation exceeds a predetermined value.

[0013]   Further, in claim 2, the hydraulic oil is pressurized on the downstream side of the hydraulic pump in the hydraulic circuit. Dissipates the heat of the hydraulic oil generated by the relief valve that causes the difference and the pressure difference. The radiators are sequentially connected, and the air heated by the radiators is blown by the blower. In a vehicle air conditioner that blows out into the vehicle, Means for detecting the temperature, and when the temperature detected by the temperature detecting means exceeds a predetermined value A control means for operating the blower and starting its air volume and gradually increasing it is provided. I'm sick.

[0014]

[Action]

  According to the vehicle air conditioner of claim 1, the temperature of the hydraulic oil in the hydraulic circuit is a predetermined temperature. When the above occurs, the blower operates, so that cold air does not blow out into the vehicle.   According to the vehicle air conditioner of claim 2, it has the effect of claim 1. However, since the air volume of the blower rises in stages, the temperature of the blown air will be It does not fall sharply afterwards.

[0015]

【Example】

  1 to 6 show an embodiment of the present invention, where C is a hydraulic circuit and D is a refrigeration circuit. Is.

[0016]   The hydraulic circuit C is composed of a hydraulic motor drive circuit C1 and a heating circuit C2. There is. The hydraulic motor drive circuit C1 includes a first oil tank 30a and a first hydraulic pump 31a. And a hydraulic motor 32, and the hydraulic oil in the first oil tank 30a is transferred to the first hydraulic pump 3 The hydraulic motor 32 is driven by the pumped hydraulic oil. It The first hydraulic pump 31a is driven by the vehicle engine. . Incidentally, 33 is a safety valve for limiting the pressure to the hydraulic motor 32.

[0017]   The heating circuit C2 includes a second oil tank 30b, a second hydraulic pump 31b, and an electromagnetic proportional type recharger. It has a leaf valve 34, a radiator 35, and a normally open solenoid valve 36 that forms a switching means. . When the solenoid valve 36 is open, it is pumped up by the second hydraulic pump 31b. The operating oil directly returns to the second oil tank 30b via the solenoid valve 36, and the solenoid valve 36 closes. When, the operating oil flows to the radiator 35 via the relief valve 34. It is like this. The second hydraulic pump 31b is connected to the hydraulic motor 32, The hydraulic motor 32 is driven by the rotational force of the hydraulic motor 32. Incidentally, 37 is A safety valve 38 for limiting the pressure to the relief valve 34 is provided in the second oil tank 30b. Oil temperature sensor.

The relief valve 34 causes a pressure difference in the hydraulic oil between the inlet side and the outlet side to heat the hydraulic oil. This calorific value is calculated by the following formula. That is, H = 1.41 × Q × ΔP H: calorific value (kcal / h), Q: hydraulic oil flow rate (l / min), ΔP: pressure difference (kgf / cm ² ) 1.41: constant ΔP = P−P ′ P : Pressure on the inlet side of the relief valve (relief pressure), P ': Pressure on the outlet side of the relief valve Therefore, the calorific value of the relief valve 34 is proportional to the set pressure of the relief valve 34 (hereinafter referred to as the relief pressure). It will be.

[0019]   The refrigeration circuit D includes a compressor 40, a condenser 41, and a liquid receiver as in the conventional example shown in FIG. 7. 42, an expansion valve 43, and an evaporator 44 are sequentially connected to each other, and a condenser 41 and an evaporator 4 are provided. 4 is for forcedly exchanging air heat by the blower fans 41a and 44a. ing. Further, the compressor 40 is connected to the hydraulic motor 32 via the second clutch mechanism 45. It is connected.

[0020]   FIG. 2 shows a rough terrain crane equipped with the vehicle air conditioner according to the present embodiment. It is a schematic block diagram which shows a state. That is, the air conditioning unit 51 is installed in the cabin 50. The air-conditioning air passage 52 in the air-conditioning unit 51 has a blower fan 44a, An evaporator 44 and a radiator 35 are installed. Further, this air conditioning air passage 52 is connected to the damper 5 By 3, it is possible to switch between the air passage for heating and the air passage for cooling. That is, heating and During dehumidification and dehumidification heating, the air in the cabin 50 is fed to the air conditioning unit 5 as indicated by the solid arrow. The air is sucked in through the suction port 54 of the No. 1 and enters the cabin 50 through the evaporator 44 and the radiator 35. At the time of blowing and cooling, the inside of the cabin 50 is passed through only the evaporator 44 as indicated by the broken line arrow. It is supposed to blow out to.

[0021]   FIG. 3 shows a control system of the blower fan 44a, and 60 is a microcomputer. It is a control unit of the configuration. The control unit 60 is connected to the oil temperature sensor 38 and , And is connected to the blower fan 44a via the timer 61. In addition, the control unit 60 A predetermined temperature ta (from 0 to ta ° C) with respect to the detection value t of the oil temperature sensor 38 is blown out And the maximum and minimum air volumes Qmax and Qmin of the blower fan 44a. Is set, and the blower fan 44a is controlled according to a program described later.

[0022]   In this embodiment, when the heating operation is performed in the winter, the clutch mechanism 45 is used. The connection between the hydraulic motor 32 and the compressor 40 is released, and the solenoid valve 36 is closed. . At this time, the hydraulic motor drive circuit C1 is operated as shown by the broken line arrow in FIG. The hydraulic oil flows and the hydraulic motor 32 is driven, but the compressor 40 is stopped. . The hydraulic oil pumped up by the hydraulic pump 31b is indicated by the broken line arrow in FIG. So that the relief valve 34, the radiator 35, and the second oil tank 30b are sequentially circulated. . Here, when the hydraulic oil passes through the relief valve 34, the inlet side of the relief valve 34 And a pressure difference occurs between the outlet side and the outlet side, and the hydraulic oil generates heat.

[0023]   Here, the operation of the control unit 60 during the heating operation is shown in the flowchart of FIG. This will be described with reference to the timing chart shown in FIG. 5 and the graph shown in FIG.

[0024]   After the operation is started, the temperature of the hydraulic oil rises and the temperature t detected by the oil temperature sensor 38 is ta or more. (S1), the blower fan 44a is driven with the minimum air volume Qmin (S2), At the same time, the timer 61 is operated (S3). As a result, the heat of the hydraulic oil is transferred to the radiator 35. The air in the air-conditioning air passage 52 is heated and the air in the air-conditioning air passage 52 is heated. Since it has not risen sufficiently, by driving the blower fan 44a with the minimum air volume, The temperature of the blown air is not too low. Next, the time of timer 61 When T (for example, 3 minutes) has elapsed (S4), the air volume of the blower fan 44a is maximized. Raise the value to Qmax (S5). At this point, the temperature of the hydraulic oil has already risen sufficiently. Therefore, normal heating can be performed by driving the blower fan 44a with the maximum air volume. Will be seen. That is, the air volume of the blower fan 44a is changed as shown by the solid line in FIG. In the conventional example shown by the dashed line in FIG. It is driven by a large air volume. As a result, in the conventional example, as shown by the dashed line in FIG. The blower fan is driven in the uncomfortable temperature range of ta or less to blow out cool air, but in the present embodiment, As shown by the solid line in FIG. 6, the blower fan 44a is driven at a temperature ta or higher, and Since it is driven with the minimum air volume within the time T after the start, the air temperature is higher than that of the conventional example. I am blown out.

[0025]   When the cooling operation is performed in the summer, the clutch mechanism 45 causes the hydraulic motor 32 and the pressure to be applied. The blower fans 41a and 44a are driven while being connected to the compressor 40. this The hydraulic oil pumped up by the first hydraulic pump 31a is As shown in FIG. 3, the hydraulic motor 32 circulates and drives it. Of this hydraulic motor 32 The compressor 40 is driven by the rotational force, and the refrigerant discharged from the compressor 40 is indicated by a solid arrow. As shown in FIG. 4, the condenser 41 → the liquid receiver 42 → the expansion valve 43 → the evaporator 44 → the compressor 40 And cycle in sequence. As a result, the air in the air conditioning circuit 52 is cooled by the evaporator 44. The inside of the cabin 50 is cooled.

[0026]   When performing dehumidification heating operation during the rainy season, etc., the solenoid valve 36 is closed and the second hydraulic pump The hydraulic oil pumped up by the pump 31b is indicated by the broken line arrow as in the heating operation. Circulate to. At this time, the blower fan 44a of the radiator 35 is heated by the controller 60. It operates with a delay similar to the time of turning, and the radiator 35 heats the air in the air conditioning air passage 52. It After the temperature of the hydraulic oil rises and the blower fan 44a operates, the clutch mechanism 45 As a result, the hydraulic motor 32 and the compressor 40 are connected for a predetermined time Ta and are connected for a predetermined time Tb. The removal is repeated and the blower fan 41a is driven. In addition, the compressor 40 discharges The discharged refrigerant circulates as shown by the solid line arrow in the same manner as during the cooling operation, and enters the evaporator 44. The air in the air conditioning air passage 52 is dehumidified and cooled. Also, the pressure difference of the relief valve 34 As a result, the hydraulic oil generates heat, and the radiator 35 heats the air in the air conditioning air passage 52. By the dehumidifying cooling by the evaporator 44 and the heating by the radiator 34, the inside of the cabin 50 is Dehumidifying heating will be performed.

[0027]   Thus, according to the vehicle air conditioner of the present embodiment, the second oil of the heating circuit C2 is An oil temperature sensor 38 for detecting the temperature of hydraulic oil is provided in the tank 30b, and heating is performed. In addition, during the dehumidifying heating operation, the temperature t detected by the oil temperature sensor 38 becomes equal to or higher than the predetermined value ta. Within a predetermined time T from when the blower fan 44a of the radiator 35 is operated and started. Is driven with the minimum air volume Qmin, and is driven with the maximum air volume Qmax after the elapse of the predetermined time T. As a result, the cavities will be stored immediately after the start of heating operation and immediately after the start of dehumidifying and heating operation. It is possible to provide a comfortable air-conditioned space because cool air does not blow into the air conditioner 50.

[0028]

[Effect of device]

  As described above, according to the vehicle air conditioner of the first and second aspects, the dehumidification / warming is performed. Immediately after the start of cell operation, cool air does not blow out inside the vehicle, providing a comfortable air-conditioned space can do.

[0029]   According to the vehicle air conditioner of claim 2, the temperature of the blown air is determined by the blower operation. It is possible to prevent a sharp decrease immediately after.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a vehicle air conditioner showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing an installation state of a vehicle air conditioner.

FIG. 3 is a block diagram showing a control system of the vehicle air conditioner.

FIG. 4 is a flowchart showing the operation of the control unit.

FIG. 5 is a timing chart showing the operation of the blower fan.

FIG. 6 is a graph showing changes in temperature of blown air.

FIG. 7 is a circuit diagram of a vehicle air conditioner showing a conventional example.

[Explanation of symbols]

31b ... second hydraulic pump, 34 ... relief valve, 35
... radiator, 38 ... oil temperature sensor, 44a ... blower fan, 5
0 ... Cabin, 60 ... Control part, C ... Hydraulic circuit

Claims (2)

[Scope of utility model registration request] 1. A release valve for causing a pressure difference in hydraulic oil and a radiator for radiating the heat of the hydraulic oil generated by the pressure difference are sequentially connected to the downstream side of the hydraulic pump in the hydraulic circuit, and the heat radiation is performed. In a vehicle air conditioner in which air heated by an air blower is blown into a vehicle by a blower, temperature detection means for detecting the temperature of the hydraulic oil in the hydraulic circuit, and the temperature detected by the temperature detection means are above a predetermined value. And a control means for activating the blower when the air conditioner is reached. 2. A release valve for causing a pressure difference in the hydraulic oil and a radiator for radiating the heat of the hydraulic oil generated by the pressure difference are sequentially connected to the downstream side of the hydraulic pump in the hydraulic circuit, and the heat radiation is performed. In a vehicle air conditioner in which air heated by an air blower is blown into a vehicle by a blower, temperature detection means for detecting the temperature of the hydraulic oil in the hydraulic circuit, and the temperature detected by the temperature detection means are above a predetermined value. The air conditioner for a vehicle is provided with a control means for activating the blower and starting the air volume of the air blower in a stepwise manner.