JPS5831556Y2 - Pressure regulating valve for medical vacuum equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a pressure regulating valve for a medical vacuum device that automatically maintains suction pressure and suction amount within a certain range.

As is well known, vacuum devices are used to suck out saliva, blood, etc. from patients during surgical and dental treatments, but recently, vacuum devices are used for 2 to 5 or 6 treatment tables. There has been an increase in the number of single-unit suction machines.

It is desirable that the suction pressure and suction amount of a vacuum device are always within a certain range regardless of the load, but in the case of the concentrated suction type mentioned above, when one treatment table is used, Suction pressure and suction volume tend to fluctuate when multiple treatment tables are used at the same time, and large fluctuations make it difficult for the surgeon to perform the procedure. If this happens, the degree of vacuum will increase rapidly and cause pain.

Until now, in order to suppress such fluctuations in suction pressure and suction amount, there have been methods that change the opening area of the pressure regulating valve depending on the balance between the differential pressure between atmospheric pressure and suction pressure and the spring force, but there are drawbacks to accuracy. In addition, there is a method of adjusting the suction pressure and suction amount by controlling the rotation speed of the vacuum pump motor, but since it uses a variable speed motor, the cost is high and a control circuit is required to control the large capacity motor. It has the disadvantage of being complicated.

The object of the present invention is to solve these problems in the concentrated suction system and provide a pressure regulating valve for a medical vacuum device with improved responsiveness and accuracy.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a perspective view of a medical vacuum device equipped with a pressure regulating valve according to the present invention, FIG. 2 is a sectional view of a main part of the regulating pressure valve, and FIG. 3 is a sectional view taken along cutting line III-III in FIG. 2. FIG. 4 is a circuit diagram showing the control circuit.

In FIG. 1, a medical vacuum device 10 has a vacuum pump 12 (a constant displacement pump is generally used in wet type vacuum devices) which is driven by a motor 11 in its casing.

), at its front part there is a discharge pipe 13 connected to the fan case part of the pump 12 and equipped with a silencer and having a discharge port 13b, and at its rear part there is a suction port 13b of the iron pipe 13.
3a, and a pressure regulating valve unit l-100 according to the present invention supported by the main pipe 14 via a connecting pipe 14a, and a pressure regulating valve unit l-100 also connected to the present invention through a nipple 14b. It is equipped with such a pressure l/run stage user 150.

Modern small transducers have a control box 160a
There is a handle inside, and the degree of vacuum inside the main suction pipe 14 is determined by the nipple 14b.
It can also be transmitted by piping.

A suction tip (not shown) used for suctioning the patient's saliva, blood, etc. depending on the treatment is connected to the main suction pipe 14 via the tube 1'5.

'The pressure regulating valve of the present invention, as shown in FIG. body 120
and a motor 1 that can rotate in forward and reverse directions and is connected to one end of the valve body 120 via a drive shaft 131 to control the angle of rotation.
30, and □ the rotary valve body 1 that communicates with the motor 130.
It is connected to the other end □ of 20 and is composed of an under-rotation degree detector 140, a blade or a sea bream pressure valve, and a control box 160a.

Rotation□The valve body 110 is polar to the connecting pipe 14a.
A suction port 112' which is symmetrical with respect to the communication port 111 and the rotation axis centerline a and is open to the outside air side is bored in the cylinder wall 11 (ja).

Rotation: The opening side where the valve body 126' is fitted and inserted is the speaking valve #1.
The 20mm bearing is supported by 1 seven shafts (□) and the motor 1
The side plate 113 to which 30 is attached is removably attached with bolts etc.
] It is stuck □.

The side walls 1 and 10b facing the side plate 113 on the opening side are located in the center of the sheep and support the rotary valve body 126 on its rotating surface via a bearing □.

The rotary valve body 120 rotatably installed inside the rotary valve body 110 connects the air passage 121 that communicates the suction port 112 and the communication port 111 according to the rotational angular position of the rotary valve body 110.
・A shaft part: j22, 123 is protrudingly installed on both sides of the valve body 110 via a bearing like a double series. With the request (=, these axial planes 1
22.1 For the three sides to reduce the force, cut the stepped round shaft □ to determine the inner direction of the core. Motor 13
0 drive shaft 13i & rotation angle degree detector 140 Insert detection shaft 141 into holes 122a, 123a
: is drilled and connected by a locking screw or hole and a trapezoidal engagement with a tight fitting shaft.

The airtightness between the outer circumferential surface of the valve body 120 and the inner circumferential surface of the valve body 110 does not need to be very strict, but is maintained by a small constant gap between the two to the extent that the stability of this pressure regulating valve can be ensured. ing.

A forward/reverse rotation motor 130 coaxially connected to the shaft portion 122 of the rotary valve body 120 is fixed on the side plate 113 and is rotationally controlled by a control circuit 160 described below.

Power for motor 130' and circuit 160 is supplied externally via control box 160a.

In addition, a rotation angle detector 14, which is generally called a potentiometer, connects the shaft portion 123 to the motor 130, the valve body i20, and the shaft core so as to coexist and detects their rotation.
0 is a mount 1 on the side wall 110b of the rotary valve body 11'O.
42, and generates a detected rotation angle signal, and is incorporated into a control circuit 160 as shown in FIG.

A pressure cadence duplex 9150 connected to the main suction pipe 14 via the nipple 14b is incorporated in the control circuit □160, and detects the degree of vacuum within the main suction pipe 14 to generate a vacuum degree signal.

The transducer 150 uses a solid stay 1...Piezo resistance is formed by diffusion, and the diaphragm deforms due to pressure changes. is proportional to the pressure as the piezo resistor's ``change death'' and generates the vacuum □ degree signal as the external output wax pressure. It is taken out on the y plane.

The flow rate in the back card suction tube 14 is compared by the rotation angle signal current voltage and the wind sensor input voltage monitor 162. ≧ 1 Aquarium A F Low ゛) Hanawa Senior Fighting Due to 4 -Rotated angle Ryugu -konyo: J ・ Sacruna Hair Burning J3: The rotation angle shown in the figure θ ”: A direction to increase The motor 130 is rotated once to increase the communication cross-sectional area and increase the degree of vacuum.
If it is high, the output voltage is higher than the rotation angle voltage.
□Move the rotation angle θ to a small value and direction f13
The pressure is adjusted in the direction of lowering the degree of vacuum by bending and turning the connecting cross-sectional area. □2 Therefore, the maximum degree of vacuum in the main suction pipe 14 is the suction ≠ when the vacuum device 10 is operated with the tube fully closed. When the suction port 112 is fully opened, the suction port 112 is fully opened.
Therefore, the minimum tightness is determined by the pipe resistance (thus, the suction port 112 is blocked by the rotary valve body 120) when the suction valve is fully open.

As is clear from the above explanation, the pressure regulating valve of the medical vacuum device of the present invention accurately detects pressure using the pressure quadramp stepper 150 that can obtain a voltage proportional to the pressure, and sequentially transmits the pressure to the forward and reverse rotation motor 130. The communication cross-sectional area between the suction port 112 and the communication port 111 is adjusted by feedback, and the pressure inside the main suction pipe 14 is always kept within a certain range regardless of the load by quickly responding to pressure changes within the main suction pipe 14. can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a medical vacuum device equipped with a pressure regulating valve according to the present invention, FIG. 2 is a sectional view of a main part of the regulating pressure valve, and FIG. 3 is a sectional view taken along cutting line III-III in FIG. 2. FIG. 4 is a circuit diagram showing the control circuit. Explanation of symbols 10...Medical vacuum device,
14...Suction main pipe, 110...Rotary valve body, 11a...Outer peripheral wall, 111...
・Communication port, 112...Suction port, 120...
... Rotating valve body, 130... Forward/reverse rotation motor, 1
40...Rotation angle detector, 150...
pressure transducer.

Claims (1)

[Scope of utility model registration request] A rotary valve body 120 that is driven by a forward/reverse motor 130 to change its rotational angular position, a rotary valve body 110 on which the rotary valve body 120 is rotatably and slidably provided, and a rotary valve that detects the rotational angular position of the rotary valve body 120. The angle detector 140 is connected to the main suction pipe 14 of the medical vacuum device 10 and
The circumferential wall 110a of the rotary valve body 110 has a pressure transducer 150 that detects the suction pressure within the rotary valve body 110, and the peripheral wall 110a of the rotary valve body 110 has a cross-sectional area of communication that can be freely communicated with and disconnected from the rotary valve body 120 according to the rotation angle position of the rotary valve body 120. A suction port 112 that is open to the outside air side and a communication port 111 that is connected to the main suction pipe 14 side are bored, and the suction pressure signal from the pressure transducer 150 and the rotation angle detector 14 are provided.
The rotation angle position of the rotary valve body 120 is changed by driving the forward/reverse motor 130 whose rotation angle is controlled by the rotation angle signal from 0, and the suction pressure inside the suction main pipe 14 is kept constant by adjusting the communication cross-sectional area. A pressure regulating valve for medical vacuum equipment that maintains the pressure within the range.