JPH02150665A - Cooler - Google Patents

Abstract

PURPOSE:To speedily ensure normal operation without the overload operation of a cooler when the cooler is started rapidly by providing the cooler with a temperature sensor for detecting the cooling water temperature at a cooling water outlet of an evaporator and a control means such as a compressor. CONSTITUTION:When a main switch MS is closed, the coil X1C of a relay X is excited and a compressor motor start conductor CM is actuated to start a compressor 1 so as to start the operation of a cooler. When the cooling water outlet temperature of an evaporator 4 is higher than a set value, a temperature switch 7 is opened, a normally opened contact S1a is opened and a volume control solenoid valve US9 is in a non-excited state and the compressor 1 is volume-controlled in a condition that the coil SC of a relay S which is a control means such as the compressor is in a non-excited state. In addition, since the normally opened contact S2a of the relay S is opened, a cooling water control solenoid valve SW8 is in a non-excited condition, and closed so that the cooling water is allowed to flow in from one side of a lower half to a water cover 10 and to flow out from the other side of a upper half. Even if cooling water temperature is low, the pressure of a high pressure medium is protected from being lowered and rated operation can be performed at an early stage without the actuation of a protecting device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling device that lowers the temperature inside a room, for example, lower than the temperature outside.

[Prior Art] Fig. 6 is a refrigerant system diagram showing an example of a conventional air conditioner, in which (1) is a compressor, (2) is a water-cooled condenser, and (3) is a water-cooled condenser.
is an expansion valve, (4) is an evaporator, (5) is a cold water inlet/outlet of the evaporator (4), (6) is a cooling water inlet/outlet of the condenser (2), (9)
) is a solenoid valve US for capacity control of the compressor (1).

FIG. 7 is a control electric circuit diagram of a conventional cooling device, in which the main switch MS and the coil xlC of the relay X1 are connected in series between the power supply lines p and q, and the normally open contact Xla of the relay The motor conductor-CM of the compressor 1 is connected in series.

Next, the operation of the cooling device having the above configuration will be explained. The gaseous refrigerant pressurized by the compressor (1) is cooled by the condenser (2), where it is condensed and liquefied, and then guided to the evaporator (4) via the expansion valve (3).

Here, the refrigerant exchanges heat with the atmosphere and is returned to the compressor (1) as a gaseous refrigerant. On top of this, the activation process is repeated.

When main switch MS is turned on, coil XI of relay X1
C is energized, its normally open contact X I & is opened, the conductor CM of the compressor (1) is operated, and the compressor (1) is started. At the same time, the solenoid valve US (9) is energized and the compressor (1) operates at full load.

[Problems to be Solved by the Invention] Conventional cooling devices are configured as described above, but the system between the cooling device and the load has an operation pattern of cooling during the day and heating at night during the intermediate period. When starting the cooling system, overload operation is performed during the transition period, or the cooling water temperature of the condenser (2) is decreasing, so the pressure of the high-pressure refrigerant decreases, the saturation temperature decreases, and the expansion valve (3) There were problems such as flashing occurring at the front, a decrease in cooling capacity, and a delay in startup until normal operation, resulting in abnormal shutdowns.

The present invention has been made to solve these problems, and an object of the present invention is to provide a cooling device that improves cooling performance without overload operation and enables early rated operation.

[Means for Solving the Problems] The air conditioner according to the present invention includes a temperature sensor that is attached to the cold water outlet of the evaporator and detects the temperature of the cold water at the cold water outlet, and a compressor when the value of the temperature sensor exceeds a set value. The compressor or the like is provided with a control means such as a compressor that performs a capacity control operation to perform half-load operation until the temperature of the cold water becomes below a predetermined temperature and decreases the flow rate of the cooling water of the condenser.

[Function] In the cooling device of this invention, when the temperature sensor value exceeds the set value when cooling operation is started, the compressor performs capacity control operation by the compressor control means. , and the flow rate of cooling water in the condenser is reduced to prevent a pressure drop in the high-pressure refrigerant.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram showing one embodiment of the present invention.
The same or equivalent parts as in the figures and FIG.

In the figure, (7) is a normally closed temperature switch, (7a) is a temperature sensor installed on the outlet side of the cold water inlet/outlet (5), and when the detected value of this temperature sensor (7a) exceeds the set value, the temperature switch is switched off. (7) is open. (8) is a cooling water control solenoid valve installed on the inlet side of the cooling water inlet/outlet (6).

FIG. 2 is a control electrical circuit diagram of the air conditioner shown in FIG.
The coil XI and the coil XIC are connected in series, and the relay X1
The normally open contact XI& of the compressor (1) and the motor starting conductor CM of the compressor (1) are connected in series. The normally open contact S 1a of the relay S, which is a control means for the compressor, etc. and the solenoid valve US (9
) are connected in series, and the temperature switch (7) and the coil SC of the relay S are connected in series. A normally open contact S2a of the relay S and a cooling water control solenoid valve SW (8) are connected in series.

3 to 5 show the condenser (2) in the cooling system of FIG. 1, where (10) is a cooling water inlet/outlet cover, and (11) is a cooling water return water metering cover.

Next, the operation will be explained. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor (1) is introduced into the water-cooled condenser (2), where it exchanges heat with the cooling water that passes through the cooling water inlet and outlet (6) as it flows through the outside of the finned pipe. Cooled by The refrigerant is condensed and liquefied, passes through the expansion valve (3), and then passes through the evaporator (
In step 4), it is vaporized by heat exchange with the cold water to be cooled, and is returned to the compressor (1) to repeat the above process.

This operation itself is the same as that of the conventional cooling device shown in FIG.

When the main switch MS is closed to operate the cooling system, the coil XIC of the relay X1 is energized, and its normally open contact X
I8 is closed, the compressor motor starting conductor CM is activated, the compressor (1) is started, and the cooling device starts operating. At this time, when the cold water outlet temperature of the evaporator (4) is higher than the set value, the temperature switch (7) is open, and therefore the coil SC of the relay S, which is the control means for the compressor, etc.
is in a non-energized state and its normally open contact S Hg is open. Therefore, the capacity control solenoid valve US (9) is de-energized and the compressor (1) performs capacity control.

In addition, since the normally open contact S2a of the relay S is open, the cooling water control solenoid valve SW (8) is in a non-excited state, the solenoid valve SW (8) is closed, and the cooling water is supplied to the water M (1
0), tjlE people flow from one side of the lower half, and flow out from one side of the 10-year-old. As a result, even if the chilled water temperature is low, the pressure of the high-pressure refrigerant is prevented from decreasing, and rated operation can be carried out quickly without the protection device being activated.

On the other hand, when the cold water outlet temperature of the evaporator (4) is lower than the set value, the temperature switch (7) is activated by the temperature sensor (7a).
Since is closed, the coil SC of the relay S becomes energized, its normally open contact S is closed, the capacity control solenoid valve US (9) becomes energized, and the compressor (1) performs capacity control. do not have.

Furthermore, since the switch S2a of the relay S is open, the cooling water control solenoid valve SW (8) is in an excited state.

When the cooling water control solenoid valve SW (8) is energized, the solenoid valve SW (8) opens and the cooling water flowing into the condenser (2) flows into the water difference (10) from the lower half and flows out from the upper half. do.

[Effects of the Invention] As explained above, the air conditioner of the present invention includes a temperature sensor that detects the temperature of cold water at the cold water outlet of the evaporator, and a means for controlling a compressor, etc. When cooling operation by the air conditioner is immediately started from operation, there is an effect that normal operation is quickly ensured without overloading the air conditioner.

[Brief explanation of the drawing]

Fig. 1 is a refrigerant system diagram showing an embodiment of the present invention, Fig. 2 is an electric circuit diagram of Fig. 1, Fig. 3 is a front view of the condenser shown in Fig. 1, and Fig. 4 is a diagram of the condenser shown in Fig. 3. 5 is a right side view of FIG. 3, FIG. 6 is a refrigerant system diagram showing an example of a conventional cooling device, and FIG. 7 is an electric circuit diagram of FIG. 6. In the figure, (1) is the compressor, (2) is the condenser, and (3)
is an expansion valve, (4) is an evaporator, (7a) is a temperature sensor,
S is a relay (compressor control means). In each figure, the same reference numerals indicate the same or corresponding parts. Compression section 7a: Temperature sensor S: Relay (compression control means)

Claims (1)

[Claims] A compressor that compresses a gaseous refrigerant, a condenser that cools the gaseous refrigerant pressurized by the compressor with cooling water and condenses it into liquefaction, and a condenser that throttles and expands the liquefied refrigerant to reduce the pressure of the refrigerant. In a cooling device having an expansion valve that lowers the temperature, and an evaporator in which the refrigerant absorbs latent heat and evaporates, there is provided a temperature sensor that is attached to the cold water outlet of the evaporator and detects the temperature of the cold water at the cold water outlet, and a value of this temperature sensor. a compressor control means for controlling the capacity of the compressor to perform half-load operation until the temperature of the chilled water reaches a predetermined temperature or lower and reducing the flow rate of the cooling water of the condenser when the temperature exceeds a set value; A cooling device characterized by: