JPH0594767U - Mechanism for detecting blockage of cleaning liquid suction nozzle in automatic analyzer - Google Patents

Abstract

(57) [Summary] [Object] To provide a mechanism for detecting and controlling blockage of a plurality of suction nozzles of a cleaning liquid of an automatic analyzer. [Structure] A set of two of each of a plurality of nozzles of a suction nozzle section is introduced, and a negative pressure of each nozzle section is introduced into a differential pressure switch, and the piston moves to the right or left when a certain pressure difference is exceeded by the switch. The movement of one or more of the pistons is detected by using a transmission type photoelectric switch whose optical axis is shielded,
It is also possible to control the fluid system by system. [Effect] The differential pressure switch is used to read the blockage of the multi-system cleaning liquid fluid system by using the translucent photoelectric switch,
The valves and pump system can be controlled individually.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a blocking process of a suction nozzle of washing water in a washing process of a reaction tube of an automatic folding device applying biochemistry or clinical chemistry.

[0002]

[Prior Art]

 For example, in JP-A-62-21063, there is a method of using a liquid level sensor between suction and discharge nozzles, and in JP-A-62-24151, a semiconductor sensor is used as a pressure sensor to discharge a sample liquid. A method of controlling the pressure is proposed, and in JP-A-57-196111, the primary chamber and the secondary chamber are guided to a pressure response device, and the differential pressure is moved by interference fringes based on the change of the refractive index of light. There are things obtained from the quantity.

[0003]

[Problems to be solved by the device]

 The cleaning device in this automatic analyzer uses pure water, acidic detergent, and alkaline detergent, and suction and discharge are performed by connecting to a vacuum pump using multiple nozzles and lines. It is an urgent task to detect the opening and closing of a plurality of suction nozzles for each system as soon as possible and to perform the response processing. In the case of Japanese Patent Laid-Open No. 62-21063, it is difficult to establish the relationship between the output and the stoppage of the nozzle in the electrostatic capacity type liquid level sensor, and there is a problem in operation. When using a pressure sensor such as the one described in No. 6, it was erroneously operated when air bubbles were mixed in, or it was difficult to operate. Further, a mechanism such as that disclosed in Japanese Patent Laid-Open No. 57-196111 has been found to be problematic as a system in which opening and closing are controlled and controlled from the relationship between the differential pressure and the refractive index of light. Therefore, an object of the present invention is to provide a blockage detection mechanism for a plurality of cleaning liquid suction nozzles that can easily and quickly respond.

[0004]

[Means to be solved by the device]

 In the present invention, in an automatic analyzer that discharges and sucks the cleaning liquid into the reaction tube by sucking the cleaning liquid into the reaction tube, two nozzles each having a plurality of nozzles are set as one set, and the negative pressures of the nozzle parts are different from each other. We proposed a cleaning liquid suction nozzle blockage detection mechanism that detects the blockage of the nozzles by detecting the blockage of the nozzles by introducing the pressure switch to control the operation of multi-system nozzles.

With respect to the pressure fluctuation of the differential pressure pressure switch described above, the piston moves to the right or left at a pressure difference equal to or more than a certain pressure difference, and the differential pressure pressure switch switches the optical axis of the photoelectric switch to be blocked. Completed the mechanism that uses Ji.

Further, a plurality of pressure switches are arranged in parallel, and one transmission type photoelectric switch moves one or more pistons of the plurality of pressure switches to the right side or the left side. The system is designed to control the blockage of the suction nozzle by using multiple differential pressure switches that do not have directivity and that can detect and output signals.

[0007]

【Example】

 As shown in FIG. 2, the cleaning water supply line according to the present invention includes pure water 21, an acidic detergent 22, an alkaline detergent 23, an eight pump 25, a collective joint portion 24, a cleaning water preheat, and an example in FIG. This is done with the vacuum suction mechanism.

Regarding the cleaning of the reaction tube 1, suction and discharge of the cleaning liquid of FIG. 4 are shown, and the reaction containers are 11, 12, 13, 14, 15, 16, 17, 17, 18, 19, 20, 1 in time series. In 11 and 11 ..., the ion-exchanged water A is discharged and its drained liquid is sucked, the same operation is performed in 13, 15, 16, and 17, and (B) alkaline cleaning water is discharged and reacted in the reaction container 12. Acid wash water is simultaneously discharged in the container 14, waste liquid is sucked in the reaction vessels 18, 20, 111, and (A) ion-exchanged water is discharged through the wash water system in FIG. 1 in the reaction vessel 19.

For the reaction tubes 11, 12, 13, 14, 15, 16, 17, 18, 18, 19, 20, 111, the reference numeral is a shower nozzle and is connected to a vacuum pump system to suck the waste liquid. In addition, the cleaning liquid is discharged to the reaction container by connecting to the eight pumps 25. Uses a suction nozzle to suck the cleaning liquid in the reaction container 20. Is a drying nozzle. A drying tip is attached to the suction nozzle, and the cleaning liquid is sucked from the drying tip to dry the reaction vessel 20. (18,111)

When the above process is completed, the process proceeds step by step, and the same operation is repeated in each reaction container (11, 12 ... 111).

A blockage detection mechanism for a suction nozzle according to the present invention is shown in FIG. A vacuum pump 113 for discharging the cleaning treatment water, a vacuum tank 114 connected thereto, a cleaning nozzle 120 connected to the vacuum tank 114 and descending to the reaction tube 1, and a water feed pump 115 for pressure-feeding the cleaning nozzle 120. It is composed of a solenoid valve 117 installed in the liquid supply pipe 116, a check valve 119 installed in a liquid supply pipe 118 connecting the vacuum pump 113 and the vacuum tank 114.

The cleaning nozzle 120 includes a cleaning water injection pipe 121 having a large diameter and a short length, and a cleaning water suction nozzle 122 having a small diameter and installed in the cleaning water injection pipe 121 and having a long diameter. The nozzle 122 is held concentrically by a seal material attached to both ends of the wash water injection pipe 121.

A bypass 123 is provided in parallel with the cleaning water in the suction nozzle 122, and the bypass 123 exists in the pipe between the suction nozzle 122 and the vacuum pump 113. A controller for controlling the operation of the on-off valve 117, the pump 115, and the suction / discharge nozzle 112 according to the suction state by providing a negative pressure differential pressure switch 124 so that the nozzle blockage can be detected by the pressure difference. The drive of the nozzle 112, the valves 112 and 117, and the pumps 113 and 115 can be controlled by 125.

The differential pressure switch 124 is housed in the side case 126, and the piston 127 moves to the right or left along with the diaphragm 128 and the spring 129 at a differential pressure equal to or higher than a certain pressure difference. In the case of the optical axis (light transmission), the piston 127 is in a substantially parallel state (124 upper figure), but when the piston 127 'moves by negative pressure, 124' is displaced as shown in the figure below, and the diaphragm 128 ', The spring 129 'is moved so much that the optical axis is blocked. This light is transmitted to the control device 125 and transmitted to the pumps 115 and 113 and the valves 114 and 117.

As shown in FIG. 3, a plurality of pressure switches 124 described above are arranged, and one transmission type optical switch 130, 131 is used to select one of the plurality of pressure switches 124, 124, 124, 124. Any one or more of the movements of the piston 129 on the right side or the left side is detected, and the light-transmitting side switch 130 and the light-receiving side switch 131 are used to communicate with the plurality of pressure switches 124 through the optical axis 132. Based on the degree of shading, each switch 124, 124 ... The blocking status of another nozzle is set as the recording control 125, and the valves 112, 115, pumps 113, 115, etc. for each series are controlled in the same manner as the above-mentioned method to control the nozzles. When clogging is prevented, the washing water is prevented from overflowing from the reaction tube 1 and the operator is warned of clogging of the nozzle.

[0016]

[Effect of the device]

 The present invention is stable because it is less susceptible to variations in pump suction pressure and pulsation by measuring the pressure difference between two nozzles each of which is a plurality of suction nozzles for operating the cleaning liquid of an automatic analyzer. The differential pressure switch switches the piston to the right or left and blocks the optical axis, and the photoelectric switch detects the movement of any one or more of the pistons. The nozzle blockage can control the pumping and valve movement and opening / closing of each water flow system to prevent overflow from the reaction tube and alert the operator of the nozzle blockage.

[Brief description of drawings]

FIG. 1 is a system diagram showing cleaning water, a vacuum system, a differential pressure switch and its control system of a closing mechanism of a cleaning liquid suction nozzle of an automatic analyzer according to the present invention.

FIG. 2 is a system diagram showing a cleaning water supply line according to the present invention.

FIG. 3 is an example of a configuration diagram of a plurality of differential pressure switches according to the present invention.

FIG. 4 is an explanatory view showing an operation of sucking and discharging a cleaning liquid when cleaning the reaction container of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reaction tube 112 Suction discharge nozzle 113 Empty pump 114 Empty tank 115 Liquid feed pump 116 Liquid feed pipe 117 Open / close valve 118 Backflow prevention valve 120 Washing nozzle 121 Wash water injection pipe 122 Suction nozzle 123 Bypass pipe 124 Differential pressure switch 125 Control device 127 piston 128 diaphragm 129 spring 130 light emitting side photoelectric switch 131 light receiving side photoelectric switch 132 optical axis

Claims (3)

[Scope of utility model registration request] 1. An automatic analyzer that sucks a cleaning liquid into a nozzle by driving a pump and then discharges / sucks it into a reaction tube. A set of two nozzles each is provided in a pipe between the suction nozzle and the pump. And a blockage detection mechanism for the cleaning liquid suction nozzle in the automatic analyzer, wherein the negative pressure of each nozzle is introduced into the differential pressure switch to detect the blockage of the nozzle by the pressure difference. 2. The differential pressure switch according to claim 1, wherein the piston moves to the right or left at a pressure difference equal to or greater than a certain pressure difference in response to pressure fluctuation, and blocks the optical axis of the photoelectric switch. Of the cleaning liquid suction nozzle in the automatic folding device. 3. A plurality of pressure switches according to claims 1 and 2 are arranged in parallel, and one transmission type photoelectric switch is provided to the right or left side of any one or more pistons of the plurality of pressure switches. Of a cleaning liquid suction nozzle blockage in an automatic analyzer, which uses multiple differential pressure switches without directivity to detect movement of the cleaning liquid and output signals.