KR960000458Y1 - Soil moisture sensor - Google Patents

Abstract

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Description

Soil Moisture Measurement and Control Sensor

1 is an enlarged view of a side view of a sensor for measuring and controlling soil moisture and a vacuum pressure gauge.

2 is a sensor for measuring and controlling soil moisture, wherein the support can be prevented from shaking when the sensor is embedded in soil.

* Explanation of symbols for main parts of the drawings

1: rubber bag 2: auxiliary tank

3: water 4: drying point adjusting screw

5: Breakpoint adjusting screw 6: Vacuum pressure gauge

7: contact lead wire 8: transparent acrylic pipe

9: screw (waterproof) 10: porous cup

11: soil 12: pressure gauge needle

13 dry contact point 14 interrupted contact point

15: drying point adjusting rod 16: breakpoint adjusting rod

17: leg 18: round clip

19: rubber

The present invention consists of a transparent acrylic pipe, a vacuum pressure gauge, and a porous cup. It is a kind of sensor that indicates the degree of dryness or moisture of the soil in terms of vacuum pressure (negative pressure). Improved performance by installing auxiliary tank and support to prevent shaking when sensor is buried in soil to extend replenishment period of water consumed to soil through control rod with watering break point and acrylic pipe. It relates to a sensor for soil moisture measurement and control.

Conventional (e.g., Japan DM-8P) sensor for soil moisture measurement and control has only a drying point adjusting rod in the vacuum pressure gauge, so when the soil is dried, the contact signal generated by contact with the pressure gauge needle does not cause any problems, but the irrigation is stopped. The signal to be made cannot be output. Therefore, when there is no break point adjustment rod to stop the irrigation, there is a inconvenience to use a combined timer.

In addition, when the soil is dried, the suction pressure of the soil is increased, and the water in the transparent acrylic pipe is moved into the soil through the porous cup of the sensor, and the transparent acrylic pipe is deficient in water, and therefore, the vacuum pressure is accompanied by an error. Therefore, it is inconvenient to frequently replenish the sensor with water. However, the conventional product installed for the purpose of water replenishment has a disadvantage in that the sensor is inclined due to the deviation of the center of gravity when the auxiliary water tank is absent or installed on the upper side of the transparent acrylic pipe. In addition, since sensors are usually embedded in the soil about 20 cm to 30 cm and contact leads are connected to computer devices or controllers, the soil is sometimes shaken in general cultivated soils where the hardness of the soil is not high. This may be damaged.

Therefore, the present invention, in view of the above problems, in order to give a signal necessary to stop irrigation, attach a stop contact point to the needle of the vacuum pressure gauge, install the irrigation breakpoint adjusting rod, extend the water replenishment in the transparent acrylic pipe, and the center is out of In order to prevent this from happening, an auxiliary tank with the center of the transparent acrylic pipe and the same line is installed, and a rubberized support inside the circular clip is designed to prevent the sensor from shaking in the soil and to control the embedding depth.

Hereinafter, the detailed description by the accompanying drawings is as follows.

In Figure 1, the structure of the sensor for soil moisture measurement and control can be divided into three parts. A transparent acrylic pipe (8) containing water (3), an auxiliary bath (2) part, a porous cup (10), and a vacuum pressure gauge (6). The principle of the sensor is that when the soil 11 is dried when it is buried in the soil 11 near the root of the cultivation crop, it is a methyl potential energy (hereinafter referred to as PF), that is, a pressure to absorb water (a kind of vacuum pressure). Will become large. At this time, the water (3) in the transparent acrylic pipe (8) is moved into the soil (11) through the porous cup 10 of the ceramic material, the water pressure in the soil (11) and the water in the transparent acrylic pipe (8) The pressure in (3) becomes parallel and this parallel pressure makes the negative pressure in the acrylic pipe so that the needle 12 of the vacuum manometer 6 represents the negative pressure at that time. This is the principle of soil moisture measurement.

However, since the principle of this measurement can be automated only when an input signal is available, two contact points, that is, a dry contact point 13 and a stop contact point 14, are attached to the needle 12 of the vacuum pressure gauge 6 so that the common signal of the electrical signal ( Common). For example, when cultivating cucumbers, if the proper soil water content of cucumbers, that is, soil moisture pressure is PF 2.3 ~ PF 2.0, PF 2.3 is dry, it is the pressure to be watered, and when watering, PF is 2.25, 2.20, It goes down to 2.15, 2.10, and 2.05, which is PF 2.0. If PF 2.0 is reached, watering must be stopped. If you keep going down to PF 1.9, 1.85, 1.8, etc., you will feed the crops with too much water, or the soil will have a lot of gravity to penetrate into the soil. Done. In addition, large weeds can produce unfavorable results. In addition, if left alone in the dry state, the PF will be 2.35, 2.40, 2.45, 2.50, etc. If the soil is very dry, the crop will dry out.

Therefore, using the drying point adjusting screw (4) and the break point adjusting screw (5), the soil moisture pressure range that cucumber prefers is the drying point adjusting rod (15) and the break point adjusting rod (16) of the vacuum pressure gauge (6), respectively. If it is set in advance in PF 2.3 and PF 2.0, the soil is dried and PF is high, so the needle 12 of the pressure gauge is PF 2.10, 2.15,... … , To 2.30. Here, when the needle 12 of the pressure gauge reaches the position PF 2.3 of the drying point adjusting rod 15 set in advance, the pressure gauge needle 12 and the drying point adjusting rod 15 are formed with a contact, and this contact signal is referred to as "starting irrigation". Can be used as a command. At this time, water is supplied through the watering device.

Due to the supply time of water, the soil 11 is filled with water, and the vacuum pressure is PF 2.30, 2.25,... … , 2.0, 1.9,5... If the irrigation breakpoint adjusting rod 16 is set to PF 2.0 in advance, the needle 12 of the pressure gauge contacts the breakpoint adjusting rod 16 to generate another input signal. You can give this command "stop irrigation".

The irrigation breakpoint adjusting rod 16 of the present invention has been devised to make a contact point that can give a command of "stop irrigation" after supplying water.

If this operation is continued, the water 3 in the transparent acrylic pipe 8 gradually decreases, and if the upper limit position of the water becomes lower than the vacuum pressure gauge 6, an input error may occur, which is not good. Therefore, it is most preferable if there is a sufficient amount at a position where the water 3 consumed into the soil is at least higher than the vacuum pressure body 6. Of course, it must be sealed and not subjected to atmospheric pressure.

In summer, the crops grow significantly, so that the water in the soil 11 is quickly dried. In this case, watering is performed almost daily, and the water (3) replenishment of the soil moisture sensor is frequently increased. In order to extend the interval of this water replenishment for at least one week, an auxiliary water tank 2 centered on the transparent acrylic pipe is installed.

In the drawing of Figure 2, the support for soil moisture measurement and control is embedded in the soil 11 about 20cm ~ 30cm, sometimes shaken, there is a risk of measurement error or the porous cup 10 may be damaged. Since the sensor is buried in the soil for at least 3 months, it is prevented from shaking by the support, and the rubber 19 is attached to the circular clip 18 so as to adjust the embedding depth by opening the support leg 17. (8) was made to be able to move up and down.

The above-mentioned design can be fully controlled by stopping excess watering when the soil moisture needs to be controlled for the purpose of automatic watering, and the auxiliary water tank and the support delay the water replenishment time in the management part and prevent the shaking of the sensor. It is a more effective design than before.

Claims (3)

In the vacuum pressure gauge 6 of the sensor for soil moisture measurement and control, which indicates the vacuum pressure generated when the water 11 in the transparent acrylic pipe 8 flows out through the porous cup 10 when the soil 11 is dried, After the dry point adjustment rod 15 set in advance and the dry contact point 13 of the pressure gauge needle 12 are irrigated and irrigated, the stop contact point 14 and the irrigation break point adjustment rod of the pressure gauge needle 12 for the purpose of stopping watering. Soil moisture measurement and control sensor, characterized in that the contact is generated when the supply of excess water to the soil by installing (16). The method of claim 1, wherein when the soil (11) is dried, the water (3) flows out through the porous cup (10), so that the water (3) in the transparent acrylic pipe (8) is reduced and transparent through the rubber stopper (1). Measurement of soil moisture with an auxiliary water tank (2) attached to the upper end of the transparent acrylic pipe (8) at the same line as the transparent acrylic pipe (8) at the upper end of the transparent acrylic pipe (8). And sensors for control. The method according to claim 1, wherein the soil moisture measurement and control sensor prevents shaking when the sensor is embedded in the soil (3) and fits the transparent acrylic pipe (8) with the leg (17) with a rubber clip (19). A sensor for measuring and controlling soil moisture with a support that can adjust the height.