JPS60256765A - Method of operating engine heat pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The undeveloped FIA is used to supply hot water as a heat source for heating greenhouses, etc.
The engine heat pump is configured to supply water, and more specifically, it is configured to increase or decrease the engine rotation speed according to changes in the heat load in the greenhouse.

[Prior art]

In the conventional method for controlling the operation of an engine heat pump using this type of circulation, engine rotational speed control is performed by increasing or decreasing the engine speed so as to continuously follow fluctuations in heat load.

[Problem that the invention seeks to solve]

However, in the above-mentioned rotation speed control method, when the rate of fluctuation of the heat load is slow and the gradual speed change state matches the dangerous speed range of the engine,
It takes a long time for the engine speed to pass through the critical speed range, and there is a risk that the engine itself may cause abnormal vibrations.

Therefore, as long as such a speed control method is adopted, the dangerous speed range of the engine itself is controlled by the speed control 1jI<
In order to do this, it was necessary to make the engine itself non-standard and add mechanical mechanisms such as adding an absorption damper to alleviate vibrations, which was disadvantageous in terms of cost. .

An object of the present invention is to propose an engine resonance phenomenon that can be avoided by changing the control method even when the critical engine speed range is within the engine speed control range.

[Means to solve the problem]

The characteristic configuration according to the present invention is to check and prevent the engine speed increase/decrease control toward the side of entry into the dangerous speed range after the engine speed reaches the upper and lower limits of the predetermined dangerous speed range, thereby increasing the heat pump capacity and the required heat load. The point is that the rotational speed increase/decrease control is returned to when the deviation from the rotational speed is sufficiently larger than the normal control range, and its effects are as follows.

[For production]

In other words, when the engine speed increases and reaches the lower limit of a predetermined dangerous speed range, and decreases and reaches the upper limit, the increase/decrease control that conventionally follows the load is stopped and the engine speed is prevented from entering the dangerous speed range. I will prevent it.

・) For example, this is a book that restarts the increase/decrease control when the temperature of the hot water section, etc. reaches the upper and lower limits of the set temperature, that is, when the deviation between the heat pump capacity and the required heat load is sufficiently larger than the normal control dead zone. So weird! The speed of increase/decrease that follows tl+load becomes large, allowing you to instantly pass through the dangerous rotational speed range.

It is possible to suppress the resonance phenomenon of the engine, etc.

〔Effect of the invention〕

Therefore, control to increase or decrease the number of revolutions is temporarily blocked.

By changing the control characteristics to make the rising slope steeper by taking advantage of the delay in stopping shaving.

We have now been able to propose a control method that provides good operating conditions without requiring mechanical changes.

〔Example〕

Is Figure 4 an engine heat pump? The general configuration of the hot water storage and heating equipment used is shown, (11 is the greenhouse, (2) is each greenhouse (
1) hot water pipes as a radiator installed in the hot water pipes (3), a hot water storage tank for storing hot water to be circulated through these hot water pipes (2), and (4) connected to the hot water storage tank (3). ′″
,! 'L717)") -; : [#91 knee"51p. 61 The heat pump (4) is a refrigerant compression compressor (
6), an engine (7) that drives this, a condenser (8),
It consists of an expansion valve (9), an evaporator (10), a first heat exchanger 111) whose heat source is engine cooling water, and a second heat exchanger +121 whose heat source is engine exhaust gas. (3) The hot water taken out from #! compressor (8), first heat exchanger +111. and second heat exchanger tI
It is layered in a structure that heats it by passing it through in the order of 21. still.

Well water pumped up by pump 04 is used as the heat source water for the evaporator (lO). In addition, the hot water storage tank +3+Fi is divided into a high temperature tank (a) and a low temperature tank (b) by a partition wall rm that can freely overflow, so that the low temperature water that has radiated heat and is returned does not mix with the high temperature water in the tank. It is configured.

A sensor (one wheel) for detecting the hot water temperature is provided on the high temperature tank (a) side of the hot water storage tank (3), and this is a speed regulating control circuit aη of the engine (7) in the heat pump 14) K.
The engine rotation speed is controlled to increase or decrease in response to changes in the % heat load.

As shown in Figures 181 to 8, a rotation speed detection gear (18) is attached to the output shaft of the engine (7), and
An electromagnetic sensor O (to) is mounted on this detection gear 08HC, and the engine rotational speed is configured to be fed as an electromagnetic pulse to a regulating control circuit (171).

When the rotational speed increase/decrease control of the engine (7) is related to the critical engine speed range, the following control is performed to prevent the resonance phenomenon of the engine (7).

The temperature of the hot water supplied to the heat pump (4) is set to a certain range, which varies in response to the number of scorched fish, and when the engine speed, which increases in response to the increase in load, reaches the lower limit of the specified dangerous speed range. In order to check and prevent the rotation speed from entering the dangerous rotation range while maintaining the rotation speed at the current value, the temperature of the supplied water reaches the set lower limit temperature, that is, the heat pump capacity and the required heat load. When the deviation from the engine speed has become sufficiently larger than the normal control dead zone, the rotation speed control is returned to, and while rapidly increasing the speed through the critical rotation range, the O engine rotation speed decreases and reaches the upper limit of the critical rotation range. Similar rotation speed control is performed even when the rotation speed is reached.

[Another example]

After the engine speed reaches the upper and lower limits of a predetermined dangerous speed range, maintaining that speed for a certain period of time,
You may also adopt a method of checking and preventing the rotation speed increase/decrease control on the side of entering the dangerous rotation range in Section 60.

[Brief explanation of drawings]

The drawings show an embodiment of the method of operating an engine heat pump according to the present invention, and FIG. 1 shows a control state of the engine rotation speed, which is controlled to increase or decrease the rotation based on the set source power depending on the hot water temperature in response to the heat load. FIG. 2 is a flowchart for controlling the increase/decrease in engine speed, and FIG. 8 is a diagram of a support facility using an engine heat pump. ) Agent: Patent Attorney Kitatori 1. \ Yajinsu Poison

Claims (1)

[Claims] A 1'lU1 method for operating an engine heat pump configured to increase or decrease the engine speed according to changes in heat load, wherein the dangerous rotation is performed after the engine speed reaches the upper and lower limits of a predetermined dangerous rotation range. An engine heat pump operating method that checks and prevents the rotation speed increase/decrease control on the side entering the region, and returns to the rotation speed increase/decrease control in a state where the deviation between the heat pump capacity and the required heat load is sufficiently larger than the normal control dead zone.