JPH11218366A - Driving system for large vehicle mounted refrigerating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a large refrigerating machine mounting a general purpose refrigerating machine on an automobile in which driving rotational speed of the refrigerating machine is invariant even if the rotational speed of a driving source, i.e., an engine, fluctuates depending on the traveling speed of the automobile and a specified refrigerating capacity is sustained. SOLUTION: In a vehicle mounted refrigerating machine employing the automobile engine as a driving source, the refrigerating machine 4 is coupled with the engine 1 through a hydraulic unit comprising a variable piston hydraulic pump 2 and a hydraulic motor 3 coupled with the engine 1. An oil channel 5 between the pump 2 and the hydraulic motor 3 is provided with an orifice 6 for releasing pulsation of oil and the channel 5 is shunted. The refrigerating machine comprises a regulator 7 for making uniform the pressure and quantity of oil being delivered to the hydraulic motor 3 and circulating the oil back to the pump 2, and a pressure release valve 8. Sumps 91, 92 and 93 of the oil being fed to the pump 2 and the motor 3 and the oil being discharged from the valve 8 are shared and driving rotational speed of the refrigerating machine is kept constant regardless of the traveling speed of an automobile.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to an in-vehicle large refrigerator using a general-purpose refrigerator mounted on an automobile, in which the rotation speed of a driving source engine fluctuates due to a change in the traveling speed of the automobile. However, the use of the hydraulic device keeps the driving rotation speed of the refrigerator at a constant rotation speed, and the refrigerator is a driving system that maintains a predetermined refrigerating capacity, and can be widely used for on-vehicle refrigerators.

2. Description of the Related Art In a conventional on-board refrigerator, a refrigerator is directly connected to a vehicle engine serving as a driving source via a pulley, so that the speed of the vehicle engine fluctuates according to the traveling speed. As a result, the rotation speed of the refrigerator greatly fluctuated. Therefore, in order to maintain a predetermined refrigeration capacity of the refrigerator, only a refrigerator of about 3 horsepower can be mounted as a vehicle-mounted refrigerator, and a large-sized refrigerator has not been used on a vehicle.

[0003] Problems to be Solved by the Invention [0004] Conventional vehicle-mounted refrigerators are connected to the engine of the vehicle and take measures to directly transmit the rotation of the engine to the refrigerator. When the rotation speed of the engine changes in accordance with the above, the rotation speed of the refrigerator is directly affected, and it is difficult to maintain the predetermined refrigeration capacity of the refrigerator. Therefore, there are various problems in mounting and using a large refrigerator as a vehicle refrigerator.

According to the present invention, a rotation speed of a refrigerator is always kept constant irrespective of a change in the rotation speed of an engine by interposing a series of hydraulic-related devices between an engine of the automobile and the refrigerator. This is a driving method that can be used.

[Means for Solving the Problems] The present invention solves the conventional problems. That is, in an in-vehicle refrigerator that uses an automobile engine as a drive source, the engine and the refrigerator are connected via a hydraulic device including a variable piston hydraulic pump and a hydraulic motor connected to the automobile engine. In the oil flow path between the hydraulic motors, an orifice is provided to alleviate oil pulsation, and the oil flow path is shunted to make the discharge pressure and discharge amount of the oil sent to the hydraulic motor uniform, thereby making the variable piston The hydraulic pump is provided with a regulator for recirculating oil, a pressure relief valve, and a common oil reservoir for the oil supplied to the variable piston hydraulic pump and the hydraulic motor and the oil discharged from the pressure relief valve. This is a driving system for a large-sized on-board refrigerator.

[Operation] The operation will be described with reference to the embodiment shown in FIG. A hydraulic device 12 is provided between the engine 1 and the refrigerator 4 of the automobile. Originally, a hydraulic device is such that a hydraulic pump is connected to a device such as a motor that rotates at a constant speed, and rotational energy is converted into force energy and used. The present invention is a system in which a hydraulic device is connected to an automobile engine, and the refrigerator is hydraulically driven through the hydraulic device, so that the rotation speed of the refrigerator is kept constant regardless of any fluctuation of the engine. Has functions. In FIG. 1, the rotation of the engine 1 is transmitted to a variable piston hydraulic pump 2 via a pulley 11. The oil from the variable piston hydraulic pump 2 is sent to the hydraulic motor 3 through an oil passage 5, and an orifice 6 is provided in the oil passage 5. The orifice 6 has a function of alleviating the pulsation generated in the variable piston hydraulic pump 2. The output side of the orifice 6 is diverted so that a discharge pressure and a discharge amount are equalized, a regulator 7 for returning oil to the variable piston hydraulic pump 2 is provided, and a pressure relief valve 8 is provided. The pulsation of the oil sent from the variable piston hydraulic pump 2 to the hydraulic motor 3 is reduced, and the discharge pressure and the discharge amount are made uniform by the action of the orifice 6 and the regulator 7.

The output energy of the hydraulic motor 3 which rotates at a constant speed according to the uniformized discharge pressure and discharge amount of oil is transmitted to the refrigerator 4 via the pulley 11, and the refrigerator 4 is rotated at a constant speed to achieve a predetermined refrigeration capacity. maintain. Therefore, the drive of the refrigerator 4 is stably maintained at a constant rotational speed regardless of the rotation of the engine 1, so that a large-sized refrigerator can be used as compared with the related art.

An oil sump 91 for the oil supplied to the variable piston hydraulic pump 2, an oil sump 92 for the oil discharged from the pressure relief valve 92 and an oil cooler 10 are supplied to the hydraulic motor 3. As shown by a dotted line in FIG. 1, the same oil reservoir is commonly used for the oil reservoir 93, so that the amount of storage increases and the oil supply is always stable.

[Embodiment] An embodiment will be described with reference to the block diagram of the embodiment shown in FIG. The engine 1 and the refrigerator 4 are connected via a hydraulic device including a variable piston hydraulic pump 2 and a hydraulic motor 3 connected to the engine 1 of the automobile. The refrigerator 4 is a stationary 15-horsepower, three-phase 200 volt,
A refrigerator of a model requiring 1 KW / h of electric power is used as a vehicle refrigerator. An orifice 6 is provided in the oil flow path 5 between the variable piston hydraulic pump 2 and the hydraulic motor 3 in the same manner as described above.
A regulator 7 for circulating oil is connected to the oil tank, and a pressure relief valve 8 is provided. In the same manner as described above, the oil reservoirs 91 and 9 for the oil supplied to the variable piston hydraulic pump 2 and the hydraulic motor 3 and the oil discharged from the pressure relief valve 8 are provided.
The experiment was conducted by connecting 2, 93 together.

In the above state, the running of the automobile equipped with the refrigerator 4 is changed, and the rotation of the engine 1 is repeated.
As a result of changing to 50 to 3,000 rpm, the engine 1
The rotation speed of the refrigerator 4 is 720 irrespective of the rotation speed change of
It was almost constant at rpm.

[Effects of the Invention] The present invention is directed to a driving rotational speed of a mounted on-vehicle refrigerator without being affected by a change in a running speed of an automobile, that is, a fluctuation of an engine speed. Is a driving method of an on-vehicle refrigerator capable of maintaining a constant value. Therefore, a vehicle-mounted refrigerator having a limit of about 3 horsepower in the past can be mounted on a large refrigerator of about 15 horsepower and used as a vehicle-mounted refrigerator, which is extremely effective.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of a driving method according to the present invention.

[Explanation of symbols]

 1. 1. Car engine 2. Variable piston hydraulic pump Hydraulic motor 4. Refrigerator 5. Oil flow path 6. Orifice 7. Regulator 8. Pressure relief valve 91. Oil tank 92. Oil tank 93. Oil tank 10. Oil cooler 11. Pulley 12. Hydraulic equipment

Claims (1)

[Claims] 1. An in-vehicle refrigerator driven by an engine of an automobile, wherein the engine 1 and the refrigerator 4 are connected via a hydraulic device including a variable piston hydraulic pump 2 and a hydraulic motor 3 connected to the engine 1 of the automobile. An orifice 6 is provided in the oil flow path 5 between the variable piston hydraulic pump 2 and the hydraulic motor 3 to reduce oil pulsation, and the oil flow path 5 is shunted to be sent to the hydraulic motor 3. A regulator 7 for recirculating the oil to the variable piston hydraulic pump 2 by equalizing the discharge pressure and the discharge amount of the oil, and a pressure relief valve 8 to supply oil to the variable piston hydraulic pump 2 and the hydraulic motor 3; In addition, a common oil reservoir 91, 92, 93 for the oil discharged from the pressure relief valve 8 is provided, so that the driving frequency of the refrigerator is independent of the running speed of the vehicle. A drive system for large in-vehicle refrigerators that maintains a constant rotation speed.