阅读说明：本技术 接头系统 (Joint system ) 是由 杉浦博之 林丰 内藤建 井上征明 于 2018-11-06 设计创作，主要内容包括：接头系统(1S)包含：与处理流体的流体装置(2)连结的流路(11A/B)；独立于流路(11A/B)地设置,与流路(11A/B)中的流体电接触的第一以及第二电极(141/142),以及检测在流体装置(2)经过的流体的有无的检测电路(10),检测电路(10)利用第一以及第二电极(141/142)来测量流路(11A/B)间的电导通程度,并且根据流路(11A/B)间的电导通程度来检测在流体装置(2)经过的流体的有无。(The joint system (1S) comprises: a flow path (11A/B) connected to a fluid device (2) for processing a fluid; first and second electrodes (141/142) provided separately from the flow paths (11A/B) and electrically contacting the fluid in the flow paths (11A/B), and a detection circuit (10) detecting the presence or absence of the fluid passing through the fluid device (2), the detection circuit (10) measuring the degree of electrical conduction between the flow paths (11A/B) using the first and second electrodes (141/142), and detecting the presence or absence of the fluid passing through the fluid device (2) based on the degree of electrical conduction between the flow paths (11A/B).)

1. A joint system, characterized in that,

the joint system comprises:

a flow path connected to a fluid device for processing a fluid; and

electrodes, which are arranged independently in at least two flow paths, are in electrical contact with the fluid in the flow paths,

the joint system is configured to be able to measure the degree of electrical conduction between fluids in different flow paths using electrodes provided independently in the at least two flow paths.

2. The joint system of claim 1,

the joint system comprises: and a joint unit configured to be integrally provided with the at least two flow paths and to be attachable to the fluid device.

3. Joint system according to claim 1 or 2,

the connector system includes circuitry for detecting the amount of fluid passing through the fluid device or the presence or absence of fluid based on the degree of electrical conductivity.

4. The joint system of claim 3,

the circuit is provided with:

a signal generation unit that applies a square wave ac voltage in which a positive voltage and a negative voltage are periodically alternately changed to a first electrode and a second electrode provided in different flow paths;

a signal processing unit that obtains a measurement value indicating a magnitude of a current between the first electrode and the second electrode; and

and a determination unit that determines the amount of fluid passing through the fluid device or the presence or absence of fluid.

5. The joint system of claim 4,

a signal processing unit that acquires a first measurement value at a time point shifted by a predetermined time period with reference to a first time point at which the voltage applied by the signal generating unit switches from a negative value to a positive value; and a second measurement value is acquired at a time point shifted by the predetermined time with reference to a second time point at which the voltage applied by the signal generation unit switches from a positive value to a negative value,

the circuit measures a magnitude of a differential value of the first measurement value and the second measurement value as an index representing the degree of electrical conduction.

6. The joint system of claim 5,

the circuit is provided with: and a time measuring unit that measures an offset time until the measured value obtained by the signal processing unit reaches a maximum value or a minimum value after the first time point or the second time point in a state where the fluid passes through the fluid device, and the circuit sets the offset time as the predetermined time.

7. Joint system according to claim 5 or 6,

the determination unit is configured to perform threshold processing on the difference value to detect the presence or absence of the fluid passing through the fluid device,

the circuit is provided with: and a threshold setting unit configured to set a threshold to be applied to the threshold processing.

8. The joint system of any one of claims 1 to 7,

the flow path ensures electrical insulation from the fluid and the electrode ensures electrical insulation from the fluid device.

Technical Field

The present invention relates to a joint connected to a flow path of a fluid device that treats a fluid.

Background

Conventionally, various industrial products having a flow path for a fluid such as a liquid have been known. As such industrial products, valves, switching valves, and the like for stopping the flow of liquid or switching flow paths to adjust the flow rate are often provided. In particular, in various analysis devices, inspection devices, and the like that process chemical solutions, sample liquids, and the like, for example, it is necessary to manage the flow rate and flow path of the liquid with high accuracy, and therefore, precise valves and switching valves are used (for example, see patent document 1).

As the valve and the switching valve, there are a valve and a switching valve each including a valve body driven to advance and retreat by an electromagnetic force and a valve seat pressed by the valve body. In this valve or the like, the valve element is pressed against the valve seat to close the flow path, while a gap is formed between the valve element and the valve seat when the valve element is retracted from the valve seat to close the flow path.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-75300

Disclosure of Invention

Problems to be solved by the invention

However, the conventional fluid devices such as valves, switching valves, and pumps have the following problems. That is, depending on the liquid to be treated, the valve may have a property of easily precipitating crystals and require regular maintenance, while if the maintenance is insufficient, crystals may precipitate on a sealing surface such as a contact portion between a valve seat and a valve body, which may cause a sealing failure and a failure such as leakage.

The present invention has been made in view of the above-described conventional problems, and it is an object of the present invention to provide a joint system in which the operating state of a fluid device can be easily detected.

Means for solving the problems

The invention resides in a joint system comprising:

a flow path connected to a fluid device for processing a fluid; and

electrodes, which are arranged independently in at least two flow paths, are in electrical contact with the fluid in the flow paths,

the joint system is configured to be able to measure the degree of electrical conduction between fluids in different flow paths using electrodes provided independently in the at least two flow paths.

Effects of the invention

The joint system of the present invention is a system including an electrode provided independently of the at least two flow paths. In this joint system, the degree of electrical conduction between fluids in different flow paths can be measured using electrodes. If there is a flow of fluid or a liquid leak between different channels, the degree of electrical conduction between the fluids increases, and for example, the resistance value between the fluids decreases. On the other hand, if the fluid is blocked between different channels, the degree of electrical conduction described above becomes low, and for example, the resistance value between the fluids becomes large.

The joint system of the present invention is a system which facilitates measurement of the degree of electrical conduction between fluids in different channels and is suitable for detection of the operating state of a fluid device.

Drawings

Fig. 1 is a diagram showing an example of mounting a joint unit constituting a joint system in example 1.

Fig. 2 is a perspective view showing a cross-sectional structure of the joint unit in example 1.

Fig. 3 is a diagram for explaining a valve opening operation of the solenoid valve in embodiment 1.

Fig. 4 is a block diagram of a detection circuit incorporated in the connector unit in embodiment 1.

Fig. 5 is a diagram showing a connector unit incorporating a detection circuit in example 1.

Fig. 6 is a diagram showing another joint unit in example 1.

Fig. 7 is a view showing an example of fitting of a joint constituting the joint system in example 2.

Fig. 8 is a structural view of a joint in embodiment 2.

Fig. 9 is an explanatory view of a joint unit incorporated in the shunt in example 3.

Fig. 10 is a perspective view of a joint unit in embodiment 3.

Fig. 11 is a sectional view showing the structure of a joint portion of the joint unit in example 3.

Fig. 12 is a circuit diagram showing an equivalent circuit of an electrical path between electrodes in example 4.

Fig. 13 is a graph showing an ac signal, an intermediate signal, and a detection signal in example 4.

Fig. 14 is a block diagram of a control unit in embodiment 5.

Fig. 15 is a graph showing an ac signal, an intermediate signal, and a detection signal in example 5.

Detailed Description

Fluid devices to which the joint system of the present invention is applied include switching valves such as a valve, a three-way valve, and a four-way valve, pumps that pressurize and convey a fluid in a flow path or suck a fluid, and also include a pipe (pipe) or a tube (tube) having a flow path, a flow divider having a plurality of flow paths, and the like. The conduit or pipe having the flow path may be a straight single pipe, or may be a branch pipe or a collection pipe having a branch portion or a confluence portion of the flow path.

A preferred embodiment of the present invention provides a joint system including: the at least two flow paths are integrally provided, and are configured to be attachable to a joint unit of the fluid device.

When the joint unit in which the at least two flow paths are integrally provided is attached to the fluid device, the degree of electrical conduction between fluids in different flow paths can be efficiently measured.

A preferred embodiment of the present invention provides a joint system including: and a circuit for detecting the presence or absence of fluid passing through the fluid device based on the degree of electrical conductivity.

According to the joint system including the detection circuit, it is possible to detect a malfunction such as liquid leakage of the fluid device by detecting the presence or absence of the fluid passing through the fluid device.

A preferred embodiment of the present invention provides a joint system including: circuitry for detecting the amount of fluid passing through the fluid device based on the degree of electrical conductivity.

The amount of the fluid depends on a cross-sectional area of a passage of the fluid in the fluid device, or a temporal occupancy rate of an open state in a case where an open state and a closed state of the passage are temporally switched by load control or the like, for example. It is considered that the degree of electrical conduction varies depending on the sectional area of the passage, the occupancy of the open state over time, and the like. Therefore, the amount of the fluid can be detected based on the degree of electrical conduction.

In the joint system according to a preferred aspect of the present invention, the flow path ensures electrical insulation from the fluid, and the electrode ensures electrical insulation from the fluid device.

In this case, the degree of electrical conduction between the fluids can be measured with high accuracy.