JPS602547Y2 - Refrigeration equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a refrigeration system, more specifically, a container refrigeration system, a water-cooled chiller set refrigeration system, etc., which is equipped with a water flow passage, and is a water-to-water heat exchanger that exchanges heat with the water flowing through the flow passage. It relates to a refrigeration device with a container.

Generally, in a refrigeration system equipped with a water-to-water heat exchanger as described above, a static pressure detector is used to detect the inlet side pressure in the water flow path connected to the water-to-water heat exchanger, or to detect the inlet side pressure and the outlet side pressure. The drive control of motors for refrigeration equipment such as compressor motors and fan motors is performed by detecting the pressure difference with the side pressure.

That is, in a container refrigeration system, an air heat exchanger equipped with a fan is provided in addition to a water heat exchanger, and when the pressure is at a certain value (for example, 1.0 ko/C71 or higher), the air heat exchanger is installed. The detector switch is opened to stop the fan motor, and if the pressure does not reach the constant value, the detector switch is closed to drive the fan motor and the air heat exchanger is activated. In addition, in a water-cooled chiller set refrigeration system, when the pressure in the flow path of chilled water and cooling water exceeds the above-mentioned certain value, the compressor motor is driven to reduce the pressure. If the constant value is not reached, the compressor motor is controlled to be stopped.

However, in a conventional refrigeration system configured as above, the static pressure in the flow path is detected, so for example, clogging may occur in the water-to-water heat exchanger or on the outlet side of the flow path. Furthermore, even if abnormal pressure occurs in the entire flow path, the increase in static pressure is detected and a switch of the detector is operated, so that even if there is no water flow in the flow path, the fan motor is activated. The compressor motor may not be driven, or the compressor motor may be driven.

Therefore, in the case of the container refrigeration system, the fan motor of the air-to-air heat exchanger does not operate even though water does not flow to the water-to-water heat exchanger, and the high pressure of the refrigeration system increases abnormally, making it inoperable. Further, in the case of the water-cooled chiller set refrigeration system, there was a problem in that the compressor was driven even though water was not flowing, causing freezing of the water and abnormal rise in high pressure.

Therefore, the present invention solves the conventional problem by controlling the drive of the motor for refrigeration equipment so that if there is no water flow in the flow path, the fan motor is driven and the compressor motor is stopped. In order to solve this problem, each port of a dynamic pressure detector having a static pressure detection port and a total pressure detection port of static pressure and dynamic pressure is arranged in the flow path, and the The present invention is characterized in that a switch operated by the dynamic pressure of the motor is interposed in the electric circuit of the motor, and the drive of the motor is controlled by opening and closing the switch.

Embodiments of the refrigeration system of the present invention will be described below based on the drawings.

What is shown in FIG. 1 is a refrigeration system for marine containers, in which an air condenser 2 equipped with a fan 3 is connected to the discharge side of a compressor 1, and a condenser equipped with a water flow path 5. A water-to-water heat exchanger 4 is connected thereto.

In FIG. 1, 6 is an expansion valve and 7 is an evaporator.

In the refrigeration system configured as described above, a dynamic pressure detector 1 having a static pressure detection port 11 and a total pressure detection port 12 for static pressure and dynamic pressure is provided in the inlet side pipe line 51 of the flow path 5.
The ports 11 and 12 of 0 are arranged respectively, and a switch 16 is connected to the fan motor that drives the fan 3, and a switch 16 is created using the dynamic pressure (differential pressure between total pressure and static pressure) built into the detector 10. As shown in FIG. 2, the dynamic pressure detector 10 has the static pressure detection port 11 in a tubular body 13 having a straight section of the required length to make the water a laminar flow. A detection tube 14 having a total pressure detection port 12 is connected to a detection tube 15 having a total pressure detection port 12, and each of the ports 11 and 12 is connected to a run-up section in which water is made into a laminar flow from the flowing water side end of the tubular body 13. Each of the detection tubes 14 and 15 is connected to a detector body 17 having a switch 16 operated by a diaphragm (not shown). is interposed in the middle of the inlet side conduit 51 in the flow path 5.

Further, the electric circuit of the fan motor 8 is connected in series with the switch 16 between lines 11 and 12 drawn out from the circuit to the power source of the compressor motor 9, as shown in FIG. 3, for example.

In addition, in FIG. 3, 20 is a contact point of an electromagnetic switch that controls the drive of the compressor motor 9.

Therefore, in the above configuration, the set value of the detector 10 is set so that the water flow in the flow path 5 has a flow velocity of a predetermined value (for example, 2.5yn, /5ce), When the dynamic pressure detected by the detector 10 is equal to or higher than the set value, the switch 16 is opened to prevent the fan motor 8 from being driven, and when the dynamic pressure does not reach the set value, the switch 16 is opened. Close and
It acts as if the fan motor 8 were to be driven.

Therefore, when the flow rate of water in the flow path 5 is higher than a predetermined value, the fan motor 8 is not driven.
The refrigerant discharged from the compressor 1 is condensed in the water heat exchanger 4 by exchanging heat with the cooling water introduced from the inlet pipe 51 of the flow path 5.

Furthermore, if the water-to-water heat exchanger 4 is clogged, the outlet pipe line 52 is clogged, or an abnormal pressure occurs in the entire flow passage 5, the static pressure will increase, but the flow When the flow velocity of the passage 5 is lower than a predetermined value or when water stops flowing, the dynamic pressure also decreases, so when this dynamic pressure is below the set value, the switch 16 of the detector 10 is closed, and the fan motor is closed. 8 is driven, and heat exchange is performed in the air condenser 2.

The embodiment described above is a container refrigeration device,
Although the operation of the detector 10 drives and controls the fan motor 8 of the fan 3 attached to the air-to-air heat exchanger 2, the present invention can be similarly applied to other water-cooled refrigerators.

In this case, the detector 10 is provided in a cooling water flow path connected to a water-to-water heat exchanger acting as a condenser and a cold water flow path connected to a water-to-water heat exchanger acting as an evaporator,
A switch for each of the detectors provided in each of these flow paths is interposed in series with a circuit to the power source of the motor of the compression machine 1 or an operation circuit of the motor, and the switch of each of the detectors is connected to the The compressor motor is opened when the dynamic pressure of the flow of cold water or cooling water flowing through each flow passage becomes less than a set value, and when the switch is opened due to the operation of one of the detectors, the compressor motor is stopped. It is very intimidating.

The present invention may also be applied to one of the two water-to-water heat exchangers of a water-cooled chiller set refrigeration system, and furthermore, the present invention may be applied to one of the two water-to-water heat exchangers of a water-cooled chiller set refrigeration system, and furthermore, the present invention may be applied to a water-cooled air It can also be applied to harmonizers.

As described above, the present invention does not only detect the static pressure in the flow path in a water-to-water heat exchanger, but also detects the static pressure and total pressure to detect the dynamic pressure, and this dynamic pressure is used to open and close the switch. As a result, the water passage in the water-to-water heat exchanger may become clogged, the outlet side of the water flow passage may become clogged, or the flow passage may become clogged. Even if the overall pressure becomes abnormally high and the static pressure increases, as long as there is no water flow, the drive of the motor for the refrigeration equipment can be reliably controlled, so the refrigeration equipment can be operated without abnormalities.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant piping system diagram showing an embodiment of the device of the present invention, FIG. 2 is an enlarged view of a dynamic pressure detector, and FIG. 3 is an electric circuit diagram. 4... Water heat exchanger, 5... Water flow path, 8... Fan motor, 10... Dynamic pressure detector, 11... ...Static pressure detection port, 12...
...Total pressure detection port, 16...Switch.

Claims (1)

[Scope of utility model registration request] In a refrigeration system including a water flow path 5, a water-to-water heat exchanger 4 configured to exchange heat with the water flowing through the flow path 5, and a motor for refrigeration equipment such as a compressor motor 9, the flow path 5 is , each port 11 of a dynamic pressure detector 10 having a static pressure detection port 11 and a total pressure detection port 12 for static pressure and dynamic pressure.
．． 12, and a switch 16 operated by the dynamic pressure of the detector 10 is interposed in the electric circuit of the motor, and the opening and closing of the switch 16 controls the drive of the motor. refrigeration equipment.