JP3418948B2 - Compression pump - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention changes the volume in a pump chamber by a working fluid that vibrates under pressure.
The present invention relates to a compression liquid feed pump of a type in which a liquid is supplied to and discharged from a pump chamber in a state of being isolated from the working fluid, and particularly, it is possible to detect and adjust the pressure of the liquid in the pump chamber and bleed air in the pump chamber. The present invention relates to a pressure feeding pump.

[0002]

2. Description of the Related Art Conventionally, various types of pumps for ejecting high-pressure liquid have been used. In particular, the supply / discharge operation of the pump chamber is driven by a pressurized medium isolated from the fluid to be ejected in the pump chamber. Diaphragm pumps, roller tube pumps, and the like are known as those of the system. The diaphragm pump has a diaphragm as a diaphragm inside the housing to form two storage chambers inside the housing. One storage chamber is provided with an inflow port and a discharge port to fill the inside with the liquid for jetting, and the other. The pressure fluid is applied to the working fluid filled in the storage chamber and is transmitted to the jetting liquid storage chamber via the diaphragm to suck and discharge the jetting liquid.

Further, the roller tube pump presses the flow path itself for jetting liquid in the form of a tube made of an elastic member with a roller from the outside, and periodically rotates the roller to move the fluid in the moving direction. Push it out.

In the case of adjusting the pressure of the liquid discharged from the pump in such a pump, conventionally, the volume change of the pump chamber due to the pressure vibration of the working fluid or the periodical rotational movement of the roller is set to a constant amplitude, The pressure of the jetted liquid discharged from the pump chamber was adjusted to a desired value by the pressure adjusting valve.

Further, when the pressure of the ejected liquid is detected by this type of pump, the pressure of the ejected liquid is directly detected by disposing the pressure sensitive portion of the pressure sensor directly in the pump chamber.

Further, when bleeding air from the pump chamber, when the liquid to be jetted fills the suction pipe and the pump chamber, the jetted liquid is pumped into the pump chamber from the suction port, and the air in the pump chamber is discharged. From the outside to the outside.

[0007]

However, the conventional diaphragm pump, roller tube pump and the like have the following problems.

For example, in recent years, it has been attempted to apply such a pump to a so-called water jet scalpel (a device for performing incision / ablation of a surgical site with a jet liquid). When applied to this type of surgical apparatus, it is general that physiological saline is used as a jet liquid. Then, it is necessary to disassemble these devices and sterilize or sterilize them for each surgery.

In this case, in the conventional pump, the pressure of the ejected liquid is controlled by the pressure adjusting valve provided at the discharge port of the pump chamber, and the piping for the inlet port, outlet port, drain port, etc. of the pressure adjusting valve is used. Due to the installation of the fluid tank, the structure around the pump is complicated. Therefore, there is a problem that the sterilization and disinfection work performed on these peripheral devices before and after the operation becomes very complicated.

Further, in the conventional pressure-feeding pump, when the pressure of the ejected liquid is detected, the pressure sensitive portion of the pressure sensor is arranged in the pump chamber and the pressure of the ejected liquid is directly detected, so that the pump is washed. It is necessary to remove the pressure sensor after every sterilization. Therefore, the cleaning and sterilization work performed before and after the operation becomes complicated. Also, the cleaning and sterilization methods differ depending on the type of pressure sensor, and there is the problem that steam sterilization is difficult, especially for electric pressure sensors.

Furthermore, when air is evacuated from the pump chamber by filling the suction pipe and the pressurizing chamber with liquid, the liquid must be pumped from the suction port, but until the air does not come out from the discharge port, It is necessary to continue pumping the liquid. For this reason, a large amount of liquid is required for bleeding air, and a pan or tank for storing the liquid flowing out from the discharge port is required, which complicates the structure of the pump. Further, there is a problem that the liquid stored in such a saucer or tank is wasted. Also, in the case of conventional pumps, the amount of liquid used is measured by the amount of decrease in the liquid in the liquid supply tank or container attached to the pump, but consider the amount of liquid used in air bleeding work. Therefore, there is a problem that the measurement of the liquid amount becomes complicated and it becomes difficult to measure the amount of the used liquid with high accuracy.

The present invention has been made in view of the above points, and a main object of the present invention is to provide a compression delivery pump capable of efficiently adjusting the pressure in the pump chamber. Another object of the present invention is to provide a compression pump capable of easily performing cleaning / sterilization work of a pump chamber. Further, another object of the present invention is to provide a compression liquid delivery pump capable of efficiently removing air from the pump chamber and effectively utilizing the liquid.

[0013]

In order to achieve the above object, the invention according to claim 1 is a pump that cyclically changes the volume of a pump chamber through an elastic diaphragm by a working fluid that vibrates under pressure. In the compression liquid delivery pump that sucks the liquid from the liquid supply source into the pump chamber according to the increase in the volume of the chamber and discharges the liquid inside the pump chamber from the pump chamber according to the decrease in the volume of the pump chamber, A closed volume chamber including a pressure transmission chamber in contact with an elastic diaphragm and a pressure chamber communicating with the pressure transmission chamber, and a volume of the pressure chamber for vibrating the working fluid filled in the closed volume chamber under pressure. The pressurizing chamber comprises a cylinder, and a pressure adjusting unit for periodically changing the amplitude and a variable volume adjusting unit for adjusting the initial volume of the closed volume chamber.
The pressure oscillating means is a piston that reciprocates in the cylinder.
And the volume adjusting means adjusts the position in the cylinder.
It is characterized in that it comprises an adjusting piston fitted so as to be adjustable .

In the present invention, the volume of the closed volume chamber is changed by the volume variable adjusting means to adjust the pressure of the working fluid,
By transmitting this pressure to the pump chamber via the elastic diaphragm, the pressure of the liquid ejected from the pump chamber can be adjusted. For example, reducing the volume of a closed volume chamber
The working fluid in the closed volume chamber is compressed. The compressed working fluid flows into the pressure transmission chamber, and the pressure causes the pressure transmission chamber to expand. Since the pressure transmission chamber is in contact with the pump chamber via the elastic diaphragm, the expansion of the pressure transmission chamber presses the elastic diaphragm, and as a result, pressure is applied to the pump chamber. That is, the pressure of the working fluid is transmitted from the pressure transmission chamber to the pump chamber via the elastic diaphragm. Therefore, the (liquid) pressure in the pump chamber can be increased.

Therefore, the variable volume adjusting means can adjust the pressure of the liquid injected from the pump chamber by changing the volume of the closed volume chamber.

When the volume of the pressurizing chamber is reduced by the pressure oscillating means, the working fluid is pressurized. Since the pressure of the working fluid presses the pump chamber from the pressure transmission chamber via the elastic diaphragm, the pump chamber contracts, whereby the liquid can be ejected from the pump chamber.

On the other hand, when the volume of the pressurizing chamber is increased by the pressure oscillating means, the working fluid is depressurized. Due to the pressure reduction of the working fluid, a negative pressure is generated in the pump chamber from the pressure transmission chamber through the elastic diaphragm. Due to this negative pressure, the pump chamber expands and sucks the liquid from the liquid supply source.

By periodically increasing and decreasing the volume of the pressurizing chamber with a constant amplitude and applying pressure vibration to the pressure transmitting chamber, the pump chamber is indirectly contracted and expanded,
Liquid can be sucked into and discharged from the pump chamber.

Here, the pressure vibration means a vibration caused by alternately pressurizing and depressurizing the working fluid. In other words, it means a state in which the pressure oscillates by repeating pressurization and depressurization over time.

The closed volume chamber is not limited as long as it has at least a pressurization chamber and a pressure transmission chamber and has a structure in which the working fluid cannot flow out of the closed volume chamber.

The structure of the pressure transmission chamber is not limited as long as it is in contact with the pump chamber through the elastic diaphragm and can transmit the pressure to the pump chamber through the elastic diaphragm. It is also possible to configure a part of the transmission chamber with an elastic diaphragm. For example, a diaphragm pump as a pressure converter also corresponds to the pressure transmission chamber of the present application. Further, a pressure transmission chamber provided separately from the pump chamber is provided,
The pressure may be transmitted to and from the pump chamber via both elastic diaphragms.

The structure of the elastic diaphragm is not particularly limited as long as it is made of a material capable of transmitting the pressure from the pressure transmitting chamber to the pump chamber. The position of the elastic diaphragm is not particularly limited as long as it is arranged so as to be able to transmit pressure from the pressure transmission chamber to the pump chamber.
For example, the elastic diaphragm does not always have to be placed in intimate contact between the pump chamber and the pressure transfer chamber, and it is in close contact with the pressure transfer chamber and the pump chamber when pressed from the pressure transfer chamber or the pump chamber. , May be configured to transmit pressure to each other.

The structure of the variable volume adjusting means is not limited as long as it adjusts the (initial) volume of the closed volume chamber. For example, the pressure transmission chamber or the pressurizing chamber included in the closed volume chamber is not limited. It may be configured to adjust either volume.

The structure of the pressure vibrating means is not limited as long as it vibrates the working fluid in the closed volume chamber. For example, the pressure vibrating means pressurizes by moving a piston provided in the pressurizing chamber. Instead of increasing or decreasing the volume of the chamber, the pressurizing chamber may be formed of an elastic member and the elastic force may be used to increase or decrease the volume to generate pressure vibration.

Another invention of the present application is the compression feed pump according to the invention described in claim 1, characterized in that the volume variable adjusting means changes the volume of the pressurizing chamber.

The present invention changes the (initial) volume of the closed volume chamber by changing the volume of the pressurizing chamber in the closed volume chamber, and changes the pressure of the working fluid to change the pressure of the liquid in the pump chamber. To adjust. That is, since the pressurizing chamber is included in the closed volume chamber, the volume of the closed volume chamber can be adjusted by increasing or decreasing the volume of the pressurizing chamber.

[0027]

In the present invention, as the pressure oscillating means, the working fluid can be oscillated by the reciprocating motion of the cylinder and the piston constituting the pressurizing chamber. That is, the reciprocating motion of the piston can alternately increase and decrease the volume of the pressurizing chamber (in the cylinder) with a constant amplitude, and the working fluid can be pressure-oscillated.

Further, in the present invention, by changing the position of the adjusting piston as the volume adjusting means, the volume of the pressurizing chamber composed of the cylinder can be adjusted and the (initial) volume of the closed volume chamber can be adjusted. . Thereby, the liquid ejected from the pump chamber can be efficiently set to a desired pressure.

According to a second aspect of the present invention, in the compression liquid feed pump according to the first aspect of the invention, the liquid in the pump chamber is connected to the pressurizing chamber and the upper limit pressure of the working fluid is set. Is further provided with a hydraulic pressure adjusting cylinder having a pressure adjusting means for adjusting the upper limit discharge pressure.

In the present invention, a part of the oscillating pressure of the working fluid is absorbed by the hydraulic pressure adjusting cylinder, so that the pressure amplitude (or the sudden change in pressure) of the working fluid in the pressure transmission chamber can be reduced. In the present invention, the volume of the pressurizing chamber is periodically changed by the pressure oscillating means with a certain amplitude value. Since the hydraulic pressure adjusting cylinder absorbs a part of the pulsating flow of the working fluid due to the volume change of the pressurizing chamber, the amplitude of the pressure oscillation of the working fluid in the pressure transmitting chamber is reduced by the amount absorbed by the hydraulic pressure adjusting cylinder. .

The structure of the hydraulic pressure adjusting cylinder in the present invention is not particularly limited as long as it can partially absorb the pressure vibration of the working fluid.
A spring type, a weight type, or a piston type hydraulic adjusting cylinder or the like can be used.

Further, in the present invention, the upper limit discharge pressure value of the liquid in the pump chamber is adjusted by setting the working pressure of the hydraulic pressure adjusting cylinder as the upper limit pressure of the working fluid in the system to a desired value by the pressure adjusting means. In addition, the pressure increase in the system when the injection is stopped can be restricted to the pressure upper limit value. That is, the pressure of the working fluid in the pressurizing chamber and the pressure transmitting chamber oscillates within a range equal to or lower than the upper limit pressure value set by the hydraulic pressure adjusting cylinder. This oscillating pressure is transmitted from the pressure transmission chamber to the pump chamber via the elastic diaphragm, and the volume of the pump chamber changes.Therefore, by setting the upper limit pressure of the working fluid to a desired value by the pressure adjusting means, the pump chamber ejects it. The upper limit discharge pressure of the liquid to be discharged can be adjusted.

Further, for example, when the injection of the liquid from the pump chamber is stopped, the liquid is trapped in the pump chamber, so that the pressure in the pressure transmitting chamber and the pressurizing chamber is changed by the pressure vibration of the working fluid. Trying to rise. However, since the pressure increase exceeding the set operating pressure of the hydraulic adjustment cylinder is absorbed by the hydraulic adjustment cylinder, the hydraulic adjustment cylinder vibrates by the working fluid in this state, and therefore the pressure increase of the working fluid in the system is regulated. It will be regulated by the set pressure by the means.

Here, the structure of the pressure adjusting means is not particularly limited as long as it can set the upper limit pressure of the working fluid. For example, by setting the spring force in the spring type hydraulic adjustment cylinder, by setting the weight of the weight balancer in the weight type hydraulic adjustment cylinder, and by setting the piston load in the piston type hydraulic adjustment cylinder. By setting, the upper limit pressure of the working fluid can be set. Of course, these settings may be variable settings.

Another aspect of the present invention is the compression feed pump according to the third aspect of the present invention, wherein the hydraulic pressure adjusting cylinder has a variable pressure adjusting means for adjusting the pressure amplitude of the working fluid. Characterize.

According to the present invention, in the hydraulic pressure adjusting cylinder, the pressure amplitude of the working fluid can be variably adjusted by the variable pressure adjusting means. That is, in the pressure transmission chamber,
The pressure amplitude of the working fluid is transmitted to the pump chamber via the elastic diaphragm, and changes the volume of the pump chamber according to the pressure amplitude. Therefore, the pressure of the liquid ejected from the pump chamber can be variably adjusted by variably adjusting the pressure amplitude of the working fluid.

For example, in a spring type hydraulic adjusting cylinder,
The initial deflection amount of a spring having a relatively small spring constant can be variably adjusted. In this case, if a spring with a strong spring force is separately installed in the same hydraulic adjustment cylinder and the strong spring is responsible for the pressure absorbing operation above a certain upper limit pressure,
The functions of setting and regulating the upper limit pressure of the working fluid according to the invention of claim 3 can be shared.

The invention according to claim 5 is an operation that oscillates under pressure.
The volume of the pump chamber is periodically changed by the fluid through the elastic diaphragm.
Depending on the increase in the volume of the pump chamber,
Intake the liquid from the liquid supply source into the pump chamber
The liquid in the pump chamber from the pump chamber as the volume of
In the pressure-feeding pump that discharges, the pump chamber is elastic.
To the pressure transmission chamber and the pressure transmission chamber which are in contact with each other via a diaphragm
A closed volume chamber including a pressure chamber communicating with the closed volume chamber,
The pressure chamber for vibrating the filled working fluid under pressure
Adjusting means for cyclically changing the volume of a pipe with constant amplitude
And a volume for increasing or decreasing the initial volume of the closed volume chamber.
Product variable adjusting means, and is connected to the pressurizing chamber,
The above-mentioned pump by setting the upper limit pressure of the working fluid
Having a pressure adjusting means for adjusting the upper limit discharge pressure of the liquid in the chamber
A hydraulic adjusting cylinder is further provided, the pressure transmitting chamber and the pressurizing chamber communicate with each other through a first fluid restrictor, and the pressurizing chamber and the hydraulic adjusting cylinder communicate with each other through a second fluid restrictor. The caliber of the second fluid restrictor is smaller than the caliber of the first fluid restrictor.

In the present invention, the flow rate of the working fluid flowing between the pressurizing chamber and the pressure transmitting chamber is restricted by the fluid throttle, so that the sudden change of the pressure in the pressure transmitting chamber is alleviated and the smooth pulsation (pressure oscillation) is generated. Is to give.

Here, the structure of the fluid throttle is not particularly limited as long as it can limit the flow rate of the working fluid flowing between the pressurizing chamber and the pressure transmitting chamber. For example, a fixed or variable orifice or choke can be used. Further, by appropriately selecting the cross-sectional area and the length of the flow path that connects the pressurizing chamber and the pressure transmitting chamber, the effect of a fixed throttle may be provided.

The position where the fluid throttle is provided is not particularly limited as long as it is between the pressure transmission chamber and the pressurizing chamber.

Further, in the present invention, by providing the second fluid throttle between the pressurizing chamber and the hydraulic pressure adjusting cylinder, the flow rate of the working fluid flowing from the pressurizing chamber to the hydraulic pressure adjusting cylinder is limited, and the hydraulic pressure is adjusted. The responsiveness of the cylinder operation can be set. Since the pressure transmission chamber, the pressurization chamber and the hydraulic pressure adjustment cylinder communicate with each other to form a closed volume chamber,
When the responsiveness of the operation of the hydraulic pressure adjusting cylinder is higher than the responsiveness of the operation of the pressure transmission chamber, the efficiency with which the pressure vibration of the working fluid in the pressure transmission chamber is transmitted to the pump chamber via the elastic diaphragm may decrease. . Therefore, the response of the operation of the hydraulic pressure adjusting cylinder is reduced by the second fluid throttle, and the driving efficiency of the pump chamber by the pressure transmission chamber is improved.

Further, in the present invention, the diameter of the second fluid throttle is smaller than the diameter of the first fluid throttle. That is, since the second fluid throttle has a smaller equivalent throttle channel cross-sectional area than the first fluid throttle, the responsiveness to the first fluid throttle can be increased more than that of the second fluid throttle.

Here, the structure of the second fluid throttle is not particularly limited as long as it can limit the flow rate of the working fluid flowing from the pressurizing chamber to the hydraulic pressure adjusting cylinder.
For example, an orifice or a choke can be used.

The position where the second fluid throttle is provided is not particularly limited as long as it is between the pressurizing chamber and the hydraulic pressure adjusting cylinder.

Another invention of the present application is the invention according to claim 4 characterized in that the second fluid restrictor is a variable restrictor.

In the present invention, by making the second fluid restrictor a variable restrictor, it is possible to adjust the responsiveness of the hydraulic adjusting cylinder in an actual machine, and by utilizing this, the pressure of the liquid injected from the pump chamber can be adjusted. It is also possible to adjust.

According to a third aspect of the present invention, in the compression feed pump according to the first aspect of the present invention, a pressure detecting means for detecting the pressure of the working fluid in the pressurizing chamber and outputting an electrical measurement signal. And a calculation device for calculating the discharge pressure of the liquid from the pump chamber by a preset conversion formula using the measurement signal from the pressure detection means as an input signal.

In the present invention, the discharge pressure of the liquid discharged from the pump chamber is detected by detecting the pressure of the working fluid in the closed volume chamber without directly detecting the discharge pressure of the liquid discharged from the pump chamber. . Therefore, it is not necessary to dispose the pressure detector in the pump chamber, and therefore, for example, it is not necessary to perform a complicated work such as removing the pressure detector also in cleaning and sterilizing the pump chamber.

The discharge pressure from the pump chamber can be determined by the correlation with the pressure in the closed volume chamber. For example,
If the pressure between the pump chamber and the closed volume chamber is experimentally detected, the discharge pressure can be detected from the pressure in the closed volume chamber based on this data.

Here, the structure of the pressure detector is not particularly limited as long as it can detect the pressure of the working fluid and output an electrical measurement signal. The position of the pressure detector is not particularly limited as long as it is a position where the pressure of the working fluid can be detected. For example, the pressure detector can be arranged in the pressurizing chamber or the pressure transmitting chamber. The measurement signal from the pressure detector can be used for various purposes such as a pressure waveform monitor, numerical value display, and automatic control of injection pressure.

Further, according to the present invention, the pressure of the working fluid in the closed volume chamber is detected, and the detected pressure value is converted into the discharge pressure of the liquid in the pump chamber. Therefore, it is not necessary to directly detect the discharge pressure of the liquid in the pump chamber. For this conversion, for example, an approximate expression of the correlation obtained experimentally may be used.

Here, the configuration of the calculation device is not particularly limited as long as it can convert the pressure value of the working fluid into the discharge pressure value of the liquid in the pump chamber.
For example, a device that directly converts the pressure value of the working fluid into the pressure value of the liquid in the pump chamber, or detects the maximum and minimum values of the pressure in one cycle of the pressure oscillation of the working fluid, and determines the It can be configured to convert to a liquid pressure value.

The invention according to claim 7 is an operation which oscillates under pressure.
The volume of the pump chamber is periodically changed by the fluid through the elastic diaphragm.
Depending on the increase in the volume of the pump chamber,
Intake the liquid from the liquid supply source into the pump chamber
The liquid in the pump chamber from the pump chamber as the volume of
In the pressure-feeding pump that discharges, the pump chamber is elastic.
To the pressure transmission chamber and the pressure transmission chamber which are in contact with each other via a diaphragm
A closed volume chamber including a pressure chamber communicating with the closed volume chamber,
The pressure chamber for vibrating the filled working fluid under pressure
Adjusting means for cyclically changing the volume of a pipe with constant amplitude
And a volume for increasing or decreasing the initial volume of the closed volume chamber.
And a variable product adjusting means for adjusting the working fluid in the pressurizing chamber.
Pressure detector that detects pressure and outputs an electrical measurement signal
Stage, and the measurement signal from the pressure detecting means as an input signal
Liquid from the pump chamber according to a preset conversion formula.
A calculation device for calculating the discharge pressure of the body is further provided, and the amplitude of the pressure vibration of the working fluid due to the operation of the pressure vibration means is detected from the measurement signal from the pressure detection means, and the amplitude is set to a preset value. When the volume does not reach the predetermined value, the volume variable adjusting means is actuated to increase the volume of the pressure transmission chamber, thereby further reducing the volume of the pump chamber for bleeding the air through the elastic diaphragm. It is a compression liquid delivery pump characterized by.

The present invention is effective when air bleeding from the pump chamber is not sufficient due to pressure fluctuations caused by the pressure oscillating means. When the volume of the closed volume chamber is reduced by at least the change by the pressure oscillating means by the volume variable adjusting means,
The working fluid is compressed and the volume of the pressure transmission chamber is greatly increased. Due to the increase of the pressure transmission chamber (expansion of the elastic diaphragm), the pump chamber in contact with the elastic diaphragm is pressed and the pump chamber is largely contracted, so that the volume thereof is reduced. Due to this decrease in the volume of the pump chamber, the air in the pump chamber is discharged.

In this state, when the volume of the closed volume chamber is increased more than at least the change by the pressure oscillating means by the variable volume adjusting means, the working fluid is depressurized, and the volume of the pressure transmitting chamber is greatly reduced. . Therefore, a negative pressure is generated in the pump chamber through the elastic diaphragm, the volume of the pump chamber is increased, and the liquid is sucked into the pump chamber from the liquid supply source, so that the air in the pump chamber can be completely removed. .

When the pump chamber is filled with the liquid and the air bleeding in the pump chamber is completed, the amount of expansion and contraction transmitted from the pump chamber through the elastic diaphragm is reduced. For this reason, the pressure amplitude of the working fluid at the time of completion of air bleeding is detected in advance, and the value of the pressure amplitude of the working fluid is detected and compared with the previously detected value to confirm whether the air bleeding in the pump chamber is completed. You can judge whether. Therefore, the pressure amplitude of the working fluid is detected, and when the amplitude value does not reach a certain value, the variable volume adjusting means is operated to perform the air bleeding operation.

That is, if the pressure oscillating means is originally operated,
Although the pressure in the pump chamber is also increased / decreased, a large amount of air is present in the pump chamber at the start of use of the apparatus, and the pressure change may not be sufficient only by the pressure increase / decrease, and it may take time to bleed air. In such a case, the volume varying means is operated by the control means to generate a larger pressure fluctuation, so that the liquid can be sucked into the pump chamber, in other words, the air in the pump chamber can be evacuated efficiently.

When performing air bleeding by greatly increasing or decreasing the volume of the pump chamber by this control means, a series of operations using the variable volume adjusting means and the pressure oscillating means in the compression liquid feeding pump of the present invention are performed separately. Although it may be carried out, the air bleeding work can be carried out more efficiently by incorporating it into such a series of work and automatically carrying out it.

According to a fourth aspect of the present invention, in the compression liquid feeding pump according to any one of the first to third aspects, the pressure transmission chamber has a hollow inner peripheral wall made of an elastic diaphragm. A tubular container that constitutes the pump chamber is detachably attached to an inner hole of a hollow portion of the annular chamber, and the tubular container has an outer peripheral wall that is in contact with the elastic diaphragm and has an elastic recovery force. It is characterized by In addition, according to claim 6,
The invention according to claim 5 is the compression delivery pump according to the invention of claim 5.
In the pressure transmission chamber, the hollow inner peripheral wall has an elastic diaphragm.
And an inner hole in the hollow portion of the annular chamber.
The cylindrical container that constitutes the pump chamber is detachably attached to the
The tubular container also has an elastic recovery force in contact with the elastic diaphragm.
It is characterized by having one outer peripheral wall. Also, the claims
The invention according to 8 is the pressure-feeding solution according to the invention of claim 7.
In the pump, the pressure transmission chamber has a hollow inner peripheral wall
A ring-shaped chamber composed of a diaphragm, and the hollow part of the ring-shaped chamber
The cylindrical container that constitutes the pump chamber can be attached to and detached from the inner hole of the
Mounted, the tubular container contacts the elastic diaphragm for elastic recovery
It is characterized by having an outer peripheral wall having a force.

According to the present invention, the pump chamber is used in the fluid ejecting apparatus in which it is detachable, and the elastic diaphragm constitutes the inner peripheral wall of the hollow portion of the pressure transmitting chamber, and the elastic force of the inner peripheral wall of this pressure transmitting chamber is used. By transmitting the pressure vibration of the working fluid to the pump chamber via the elastic diaphragm, the volume of the pump chamber can be increased or decreased.

[0063] In the compression liquid feed pump of the present invention, against the outer peripheral wall of the tubular container to the elastic recovery force by the pressure vibration working against the pressure transmitting chamber, and thus cyclically to a negative pressure in the pump chamber Oppress. That is, since the outer peripheral wall of the tubular container forming the pump chamber has an elastic recovery force, by utilizing this elastic recovery force, pressurization and depressurization of the working fluid by the pressure vibrating means are performed in a fast cycle. The fluid can be efficiently ejected from the pump chamber at a substantially constant pressure.

Also in the air bleeding operation of the pump chamber, when the volume of the pump chamber is reduced, the elastic recovery force of the pump chamber increases, and the elastic recovery force and the negative pressure expand the pump chamber to expand the liquid supply source. Liquid can be inhaled from.
Therefore, the air bleeding operation can be performed more efficiently.

Here, the cylindrical container can be a disposable container, which saves the trouble of cleaning and sterilization, and also causes an unexpected situation due to repeated use, for example, risk of infection in medical use. There is no sex.

Since the pump chamber is removable as a separate body, it is easy to insert and remove the pump chamber by providing a slight gap between the outer peripheral wall of the pump chamber and the inner peripheral wall of the pressure transmission chamber during normal operation. become. At the time of use, the pressure varying chamber may be expanded by the volume varying means to eliminate this gap and bring the mutual walls into close contact with each other.

[0067]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a compression liquid feeding pump according to the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram in the case where the compression liquid feeding pump according to the present invention is used for a jet knife which is a fluid ejection device.

The pressure converter 1 constituting a part of the fluid jetting device is provided with a pressure transmission chamber 6 formed by a space between a cylindrical rubber tube 5 which is an elastic member and an outer shell container 7. It is sealed at the top and bottom. The ejection system unit 2 incorporated in the pressure converter 1 is provided with a pump chamber 3 therein, and is detachable from the pressure converter 1. Further, the ejection system unit 2 has a substantially cylindrical outer shape, and its side surface portion is
Except for each end member, the outer wall of the pump chamber 3 is constituted by a cylindrical silicon tube 4.

Since the outer shell container 7 and the rubber tube 5 of the pressure converter 1 are each formed in a cylindrical shape and arranged concentrically, the pressure transmission chamber 6 has a hollow cylindrical shape, and the ejection system unit 2 is provided. It is provided inside the main body of the pressure converter 1 separately from the pump chamber 3. The inner wall of this hollow portion is made of a rubber tube 5 which is an elastic member, and pressure transmission is possible.

In this embodiment, when the ejection system unit 2 is mounted, the ejection system unit 2 is positioned concentrically in the hollow portion provided in the axial center portion of the pressure converter 1, and the outer wall of the pump chamber 3 is arranged. And a rubber tube 5 constituting the inner wall of the hollow portion of the pressure transmission chamber 6
And are facing each other. That is, the pressure transmission chamber 6 of the pressure converter 1 is disposed adjacent to the pump chamber 3 of the ejection system unit 2 via the rubber tube 5 and the silicon tube 4 that form the outer wall of each. Actually, in order to facilitate the insertion / removal of the ejection system unit 2, a slight gap is formed between the rubber tube 5 and the silicon tube 4 in the normal state.

When actually used as a fluid ejecting device, the pressure transmitting chamber 6 is filled with working fluid and pressurized to expand the rubber tube 5 forming the inner wall of the hollow portion inward. The rubber tube 5 and the silicon tube 4 are brought into close contact with each other. When only the ejection system unit 2 is replaced, the pressure transmission chamber 3 is decompressed to form a gap, the unit is removed, and a new one is inserted. In use, since the mutual walls are in close contact with each other, a double partition wall separating the pump chamber 3 and the pressure transmission chamber 6 is formed, and pressure can be transmitted through this close contact portion.

The rubber tube 5 in this embodiment is used.
The silicone tube 4 is capable of expanding and contracting in a cylindrical diametrical direction, and is not limited to these as long as it is an elastic member capable of transmitting pressure by a fluid, and the thickness and size thereof, etc. Is determined in relation to the output of the device. Further, the shape is not limited to these.

In the ejection system unit 2 of the pressure converter 1, a physiological saline infusion pack 10 serving as a supply source of ejection fluid is connected to a lower suction port through an infusion pipe 9, and an upper ejection port is connected to the ejection port. The handpiece 21 serving as an injection unit is the infusion tube 2
2 is connected.

A cylindrical pressurizing cylinder 13 for applying pressure vibration to the working fluid is connected to a communication hole 8 provided in the outer shell container 7 of the pressure converter 1 via a communication pipe 11a. A columnar spring type hydraulic pressure adjusting cylinder 19 is connected to the pressure cylinder 13 via a communication pipe 11b so that a working fluid can flow therein.

The pressure transmission chamber 6, the pressurizing cylinder 13 and the hydraulic pressure adjusting cylinder 19 constitute a closed closed volume chamber,
The working fluid flows inside the closed volume chamber, and has a structure that cannot flow out of the closed volume chamber.

The pressurizing cylinder 13 is provided with a pressurizing piston 15a as a pressure oscillating means for continuously repeating forward and backward movement in the axial direction of the pressurizing cylinder 13 in the pressurizing cylinder 13 by the rotation of the motor 15b. Has been. Further, the pressurizing cylinder 13 is provided with a variable volume piston 14a as a variable volume adjusting means capable of advancing and retreating in the pressurizing cylinder 13 in the axial direction of the pressurizing cylinder 13 by rotation of the motor 14b. There is. Therefore, the variable volume piston 14a is rotated by the motor 14b,
The position of the piston in the pressurizing cylinder 13 (volume in the cylinder) can be adjusted.

The hydraulic pressure adjusting cylinder 19 connected to the pressurizing cylinder 13 has a piston 18 biased inward by a spring inside the cylinder to constitute a spring type hydraulic pressure adjusting cylinder. A pressure sensor 20 that detects the pressure of the working fluid is connected to the communication pipe 11b that connects the hydraulic pressure adjusting cylinder 19 and the pressurizing cylinder 13. Furthermore,
Communication pipe 1 connecting the pressure transmission chamber 6 and the pressurizing cylinder 13
1a is provided with an orifice 12a as a first fluid restrictor. Further, the communication pipe 11b connecting the pressurizing cylinder 13 and the hydraulic pressure adjusting cylinder 19 is also provided with an orifice 12b as a second fluid throttle. The opening diameter of the orifice 12a is larger than the opening diameter of the orifice 12b.

When the compression delivery pump constructed as described above is used as a water jet knife, the pressure of the physiological saline ejected from the pump chamber 3 is adjusted as follows.

The variable volume piston 14a is a motor 14b.
By rotating the
3 can be moved in the axial direction. For example, the variable volume piston 14a is moved forward to decrease the volume of the pressurizing cylinder 13. As a result, the working fluid in the pressurizing cylinder 13 is compressed, and the compressed working fluid flows into the pressure transmission chamber 6 through the communication pipe 11 and is stored therein. At this time, the pressure transmission chamber 6 expands due to the pressure of the working fluid,
Since the rubber tube 5 forming the inner wall of the element presses the silicon tube 4 in the axial direction of the ejection system unit 2 by its elastic force, the rubber tube 5 and the silicon tube 4 are brought into a close contact state. This close contact state changes depending on the compressibility of the working fluid in the pressure transmission chamber 6. That is, the pressure of the physiological saline in the pump chamber 3 can be adjusted by adjusting the gap between the rubber tube 5 and the silicon tube 4 according to the magnitude of the pressure of the working fluid due to the volume change of the pressurizing cylinder 13.

With the rubber tube 5 and the silicon tube 4 in close contact with each other, the pressurizing piston 15a is reciprocated in the pressurizing cylinder 13 in the axial direction of the cylinder by the rotation of the motor 15b. The volume of the pressurizing cylinder 13 is repeatedly increased and decreased by the reciprocating movement of the pressurizing piston 15a, and the working fluid in the pressurizing cylinder is alternately pressurized and depressurized. As a result, pressure vibration is supplied to the pressure transmission chamber 6. The pressure vibration applied to the pressure transmission chamber 6 is transmitted to the pump chamber 3 via the contact portion between the rubber tube 5 and the silicon tube 4, and the physiological saline continuously inhales and discharges the pump chamber 3. Will be done.

When the working fluid is pressurized by the pressure piston 15a, the silicon tube 4 is pressed and expanded in the axial direction of the pump chamber 3 while the rubber tube 5 is in close contact with the silicon tube 4. Therefore, the silicone tube 4 of the ejection system unit 2 is pressurized, the physiological saline is pressurized and discharged from the pump chamber 3, and the physiological saline is ejected from the handpiece 21.

On the other hand, when the working fluid is decompressed by the pressurizing piston 15a, the expansion of the rubber tube 5 contracts, and the contracted silicon tube 4 tries to return to its original state by the elastic recovery force and the pump chamber 3 When the pressurized physiological saline therein tries to return to the atmospheric pressure, a negative pressure is generated in the pump chamber 3, and the physiological saline is sucked into the pump chamber 3 and stored in the pump chamber 3.

By repeating this in a fast cycle, the physiological saline which has a substantially constant injection pressure is injected from the handpiece 21.

An orifice 12a is provided in the communication pipe 11a between the pressure transmission chamber 6 and the pressure cylinder 13. The orifice 12a limits the flow rate of the working fluid flowing from the pressurizing cylinder 13 into the pressure transmission chamber 6 and alleviates a sudden pressure change of the working fluid. Since the orifice 12a limits the flow rate of the working fluid flowing into the pressure transmission chamber 6, the rapid change in the pressure vibration applied to the pressure transmission chamber 6 by the pressurizing piston 15a is moderated.

The pressure vibration of the working fluid in the pressurizing cylinder 13 is also transmitted to the hydraulic pressure adjusting cylinder 19. That is, since the piston 18 of the hydraulic pressure adjusting cylinder 19 receives the vibration pressure of the working fluid against the spring force of the spring 23, the spring 23 bends when the pressure applied to the piston exceeds the spring force. Therefore, the vibration pressure of the working fluid is partly absorbed by the contraction of the spring 23, and the pressure amplitude of the working fluid is reduced. When the pressure amplitude of the working fluid is reduced, the pressure transmitted from the pressure transmission chamber 6 to the pump chamber 3 via the rubber tube 5 and the silicon tube 4 is also reduced, so that the pressing force of the physiological saline in the pump chamber 3 is reduced. Will be done.

When the ejection of the physiological saline solution from the handpiece 21 is stopped, the physiological saline solution is trapped in the pump chamber 3. In this state, the liquid is not ejected from the handpiece 23, and even if the vibration pressure is transmitted from the pressure transmission chamber 6 to the pump chamber 3, the pump chamber 3 hardly expands or contracts. On the other hand, since the pressurizing piston continues reciprocating, oscillating pressure is applied to the working fluid. Therefore, the working fluid in the pressurizing cylinder 13 does not flow into the pressure transmitting chamber 6, and the hydraulic pressure adjusting cylinder 1 is exclusively operated.
It will flow between 9 and. As a result, when the working fluid flows in and out of the hydraulic pressure adjusting cylinder 19, its oscillating pressure is changed by the spring 23 in the hydraulic pressure adjusting cylinder 19 as described above.
Is absorbed by the hydraulic pressure adjusting cylinder 19 and the hydraulic pressure adjusting cylinder 19 vibrates instead of the pump chamber 3.

The maximum pressing force of the saline solution in the pump chamber 3 can be adjusted by adjusting the spring constant of the spring provided in the hydraulic pressure adjusting cylinder 19. When a spring having a large spring constant is mounted, the spring force is large, so the pressure of the working fluid against it is sufficiently high.
On the other hand, when a spring having a small spring constant is mounted, the spring force is small and the pressure of the working fluid against it is correspondingly low. Therefore, the upper limit pressure of the working fluid that oscillates in pressure is determined by the pressure adjustment value of the spring of the hydraulic pressure adjustment cylinder 19.

In this way, the oscillating pressure of the working fluid is
The maximum pressure of the physiological saline in the pump chamber 3 is adjusted by adjusting the spring constant of the spring 23 of the hydraulic pressure adjusting cylinder 19 in order to pressurize the physiological saline by being transmitted from the pressure transmitting chamber 6 to the pump chamber 3. be able to.

In this embodiment, the spring type hydraulic adjusting cylinder 19 is used. However, if the working fluid can flow in, the vibration pressure of the working fluid can be absorbed, and the pressure amplitude can be adjusted, The configuration is not particularly limited.
For example, a weight type hydraulic adjusting cylinder, a piston type hydraulic adjusting cylinder or the like may be used.

Further, the communication pipe 11b between the hydraulic pressure adjusting cylinder 19 and the pressurizing cylinder 13 is provided with an orifice 12b. The orifice 12b limits the flow rate of the working fluid flowing from the pressurizing cylinder 13 into the hydraulic pressure adjusting cylinder 19, thereby limiting the responsiveness of the operation of the hydraulic pressure adjusting cylinder. If the flow passage cross-sectional area between the hydraulic pressure adjusting cylinder 19 and the pressurizing cylinder 13 is limited by the orifice 12b, the flow rate of the working fluid passing through the orifice 12b decreases, and the same volume change in the pressurizing cylinder 13 is achieved. The flow rate on the pressure transmission chamber side increases. Therefore, the responsiveness of the hydraulic pressure adjustment cylinder 19 can be relatively reduced with respect to the responsiveness of the operation of the pressure transmission chamber 6, and the decrease of the operation efficiency in the pressure transmission chamber 6 can be prevented.

Here, the inner diameters of the orifice 12a and the orifice 12b are not particularly limited, but it is preferable that the inner diameter of the orifice 12b is smaller than the inner diameter of the orifice 12a. When the inner diameter of the orifice 12b is larger, a certain amount of working fluid flows into the pressure transmission chamber 6 and pressure-injects the physiological saline in the pump chamber. Therefore, the working fluid is hydraulically adjusted before the target injection pressure value is reached. It flows into the cylinder 19. For this reason, in this state, the pressure amplitude of the working fluid decreases, and it becomes impossible to eject the physiological saline in the pump chamber. However, by positively utilizing this, the orifice 12a
It is also possible to adjust the injection pressure to a desired value by selectively setting the inner diameter of the orifice 12b.

In the present embodiment, the volume of the pressurizing cylinder is changed by the volume variable piston as the variable volume adjusting means to adjust the pressure of the liquid in the pump chamber. The structure is not particularly limited as long as the volume of the enclosed volume chamber including the volume can be changed. For example, a variable volume means may be provided in the pressure transmission chamber to change the volume of the pressure transmission chamber.

Next, the detection of the pressure of the physiological saline in the pump chamber 3 in the compression liquid feeding pump of this embodiment will be described.

The working fluid in the pressurizing cylinder 13 is repeatedly pressurized and depressurized by the reciprocating motion of the pressurizing piston 15a, and its pressure amplitude is kept constant. Here, the relationship between the reciprocating movement of the pressurizing piston 15a and the pressure of the working fluid is shown in FIG. In FIG. 2, the vertical axis represents the pressure value of the working fluid, and the horizontal axis represents time. Where P
_MAX indicates the maximum pressure value and P _MIN indicates the minimum pressure value, and the difference between the maximum pressure value and the minimum pressure value is the pressure amplitude value (ΔP) of the working fluid. Further, in FIG. 2, when the pressure of the working fluid becomes maximum (P _MAX ) and becomes minimum (P _MIN ).
The position of the pressurizing piston 15a in the pressurizing cylinder 13 is shown.

As can be seen from FIG. 2, the pressurizing piston 15
By a, the pressure of the working fluid becomes maximum (P _MAX ) when the volume of the pressurizing cylinder 13 decreases most, and the pressure of the working fluid becomes minimum (P _MAX ) when the volume of the pressurizing cylinder 13 increases most. _MIN ).

In the present embodiment, the computer device 30 constituting the calculation device and the control means detects the maximum pressure value and the minimum pressure value in one cycle of the pressure oscillation of the working fluid based on the measurement output from the pressure sensor 20. ing. Then, the pressure amplitude value is obtained from the difference between the maximum pressure value and the minimum pressure value, and the pressure amplitude value is converted into the pressure value of the physiological saline by the conversion formula obtained in advance by an experiment.

A method of pressure detection by the computer device 30 will be described with reference to FIG. The pressure is detected for each cycle of the vibration of the working fluid, but a counter (CN) for determining whether or not one cycle of the pressure vibration has passed.
T) is initialized to 0.

Next, the pressure of the working fluid is detected from the measurement signal from the pressure sensor 20, and the detected pressure value is set to P ₁ . Here, in the case of the first pressure detection, the pressure detection value P ₁ is set to the maximum pressure value (P _MAX ) and the minimum pressure value (P _MIN ).
To initialize. During the second and subsequent pressure detections, it is determined whether the pressure detection value P ₁ is the maximum pressure value (P _MAX ) or the minimum pressure value (P _MIN ). Specifically, P _{1 is changed} to P
Compared to _MAX, P ₁ is greater than P _{MA X,} updates the P _MAX value of P ₁ as the maximum pressure value. Also, set P ₁ to P _MIN
Compared to, P ₁ may P _MIN is smaller than, and updates the P _MIN values of P ₁ as the minimum pressure value. However, P _MAX and P
The values of _MIN are the maximum pressure value and the minimum pressure value at the present time, respectively, and are not necessarily the maximum pressure value and the minimum pressure value in one cycle. Therefore, such an operation is performed for one cycle of pressure oscillation to determine the final maximum pressure value and minimum pressure value. Therefore, the counter (CNT) is incremented by 1, and it is confirmed from the value of this counter whether or not one cycle of pressure oscillation has ended. Here, in order to determine whether or not one cycle of the pressure oscillation has ended, the counter value (C
NT) is compared with the value of T. The value of T is the number of times pressure detection is performed in one cycle, for example, 1 in one cycle.
When performing pressure detection 100 times, the value of T is preset to 100.

When the counter value (CNT) does not reach the value of T, that is, when it does not reach one cycle of the pressure oscillation of the working fluid, whether the pressure is detected and whether it is the maximum pressure value or the minimum pressure value. Make repeated judgments. This gives P
The maximum pressure value for one cycle is obtained in _MAX , and the minimum pressure value is obtained in P _MIN .

When the maximum pressure value and the minimum pressure value in one cycle of the pressure oscillation of the working fluid are detected, the pressure of the jetted fluid is converted from the value of the difference between them, that is, the pressure amplitude value of the working fluid. FIG. 4 shows a relationship diagram between the pressure amplitude value of the working fluid and the pressure value of the liquid in the pump chamber. In FIG. 4, the horizontal axis represents the pressure amplitude value of the working fluid (difference between the maximum pressure value and the minimum pressure value), and the vertical axis represents the pressure value of the ejected liquid corresponding to the pressure amplitude value. This relationship diagram is a regression line in which the relationship between the pressure amplitude value of the working fluid and the pressure value of the liquid in the pump chamber was obtained by regression analysis in advance through experiments. Since the conversion formula can be experimentally obtained from this regression line, the pressure in the pump chamber can be detected from the maximum and minimum pressure difference in one cycle.

In this embodiment, since the pressure of the liquid in the pump chamber 3 is indirectly obtained by detecting the pressure of the working fluid in this way, the pressure sensor 20 is directly arranged in the pump chamber 3. Even when cleaning the pump chamber 3, sterilization work, steel pipes, etc.
It is possible to avoid complicated work such as removing the pressure sensor 20.

In the compression delivery pump of this embodiment,
By detecting the maximum pressure value and the minimum pressure value of the working fluid, it is converted into the pressure value of the liquid in the pump chamber.However, the pressure of the liquid in the pump chamber can be obtained by detecting the pressure of the working fluid. Other methods may be used as long as they are possible.

In this embodiment, when the pressure amplitude of the working fluid is converted into the pressure of the liquid in the pump chamber, a conversion formula based on a regression line previously obtained by regression analysis is used. The pressure value of the liquid in the pump chamber is not limited to this value as long as the pressure value of the liquid in the pump chamber can be obtained from the value, and other approximate expressions may be used for conversion.

The air bleeding of the pump chamber 3 in the compression liquid feeding pump of this embodiment will be described. FIG. 5 shows a flow chart of the air bleeding control.

This is particularly effective when the vibration pressure of the pressurizing piston 15a is not sufficient for bleeding air from the pump chamber, that is, when the pressure difference is small and it takes time to bleed air. Generally, it is performed in the first work after the replacement of the ejection unit 2.

In the state before the air bleeding work, the pressure piston 15a is reciprocating, and the pressure cylinder 1
The working fluid in 3 is subjected to pressure oscillation. Also,
Air is left in the pump chamber 3 and the infusion tube 22.

In this state, the motor 14b is driven and its rotation causes the variable volume piston 14a to move (forward) to a predetermined pressurizing position. Here, the pressurizing position at which the variable volume piston 14a is moved is a position where an appropriate pressure is applied to the physiological saline in order to eject the physiological saline from the pump chamber 3, and the pressurizing position is set in advance. If the variable volume piston has not moved to the pressurizing position, it is further moved, and the movement is repeated until the pressurizing position is reached.

When the variable volume piston 14a is moved, the pressure in the pump chamber 3 changes rapidly due to the pressure fluctuation of the working fluid. Therefore, the timer is set and the transition to the next operation is stopped until the pressure in the pump chamber 3 becomes stable.

After the time set by the timer has elapsed, whether or not the air bleeding has been completed is detected by the pressure sensor 20 of the pressure amplitude value of the working fluid, and it is judged whether or not the value is equal to or more than a predetermined value. Here, as the predetermined value, the pressure amplitude value of the working fluid at the time of completion of air bleeding is measured in advance and used.

If it is determined that the air bleeding is not completed, then the variable volume piston 14a is moved (retracted) in the direction in which the volume of the pressurizing chamber decreases. As a result, the working fluid is decompressed, and the pump chamber 3 expands via the rubber tube 5 and the silicon tube 4 of the pressure transmission chamber 6. At this time, since a large negative pressure is generated in the pump chamber 3, the physiological saline is sucked into the pump chamber 3 from the physiological saline infusion pack 10. Even in this case, the timer is set and the transition to the next operation is stopped for the same reason as when the variable volume piston 14a is moved.

After the time set by the timer has elapsed, the working fluid is compressed by further returning (advancing) the variable volume piston 14a from this state to the aforementioned predetermined position. As a result, the compressed working fluid is transferred to the pressure transmission chamber 6
Is increased, the pump chamber 3 is contracted through the rubber tube 5 and the silicon tube 4, and the volume is decreased. As a result, the air remaining in the pump chamber 3 is
It will be extracted from the pump chamber 3.

By repeating such reciprocating movement of the variable volume piston 14a, the pump chamber 3 can be sufficiently pressurized and depressurized, and the air in the pump chamber 3 can be evacuated efficiently and completely.

Also, such a variable volume piston 14a
If the air bleeding control by repeating the reciprocating motion of (3) is incorporated during the operation of the pump and is automatically performed, a more efficient air bleeding operation can be performed.

In this embodiment, a compression liquid delivery pump used for a water jet knife as a fluid ejecting device is taken as an example, but the liquid is produced by increasing or decreasing the volume of the pump chamber 3 by the pressure of the working fluid. It goes without saying that any device that injects can be used in other devices.

[0115]

As described above, according to the present invention, the pressure oscillating means for periodically changing the volume of the pressurizing chamber with a constant amplitude in order to oscillate the working fluid filled in the closed volume chamber, and the closed volume. Since the volume variable adjusting means for increasing / decreasing the initial volume of the chamber is provided, the pressure in the pump chamber can be efficiently adjusted, and the pressure of the liquid ejected from the pump chamber can be kept constant. The effect is that you can do it. In addition, since the pressure can be adjusted without discharging the liquid in the pump chamber to the outside, the pump does not require a storage tank or piping for pressure adjustment, which simplifies the structure and facilitates cleaning and sterilization work of the pump. There is an effect that can be easily performed.

Further, according to the present invention, since the pressure of the working fluid is detected when the pressure of the liquid in the pump chamber is detected, it is not necessary to connect the pressure detector to the pump chamber, and therefore the pump is washed. -Even the sterilization work can be easily performed.

Further, in the present invention, the air in the pump chamber is evacuated by reducing the volume of the pump chamber by the pressure of the working fluid, so that the air bleeding operation can be performed efficiently and the liquid can be removed. The effect is that it can be used effectively.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an application example of a compression pump in the present embodiment.

FIG. 2 is a relationship diagram between the pressure waveform of the working fluid and the position of the pressurizing piston in the present embodiment.

FIG. 3 is a flow chart diagram of pressure detection in the present embodiment.

FIG. 4 is a relationship diagram between a pressure value of a jetted fluid and a pressure amplitude value of a working fluid in the present embodiment.

FIG. 5 is a flowchart of an air bleeding operation according to this embodiment.

[Explanation of symbols]

1: Pressure converter 2: Jet system unit 3: Pump chamber 4: Silicon tube 5: Rubber tube 6: Pressure transmission chamber 7: Outer shell container 8: Communication hole 9: Infusion pipe 10: Infusion pack 11a: Communication pipe 11b: Communication Pipe 12a: Orifice 12b: Orifice 13: Pressurizing cylinder 14a: Variable volume piston 14b: Motor 15a: Pressurizing piston 15b: Motor 18: Piston 19: Hydraulic pressure adjusting cylinder 20: Pressure sensor 21: Handpiece 22: Infusion pipe 23: Spring 30: Computer device CNT: Counter value T: Number of pressure detections in one cycle of pressure oscillation of working fluid P _MAX : Maximum pressure value of working fluid P _MIN : Minimum pressure value of working fluid P ₁ : Detected pressure value of working fluid P ₂ : Working fluid pressure amplitude value P ₀ : Working fluid pressure amplitude value ΔP: Working fluid pressure amplitude when air bleeding is completed

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Urasawa 2410 Motoe Co., Ltd. Uozu City, Toyama Prefecture (72) Inventor Tadashi Tadashi Sugimori 2410 Motoe Co., Ltd. Uozu City, Toyama Prefecture (56) References (56) References JP-A-7-259741 (JP, A) JP-A-50-20304 (JP, A) JP-A-5-33773 (JP, A) JP-A-5-321841 (JP, A) Actual development Sho-59-103884 (JP, U) JP-B Hei 6-22604 (JP, B2) JP-B 51-45920 (JP, B1) JP-B 50-33241 (JP, B1) JP 60-1272 (JP, Y1) JP Publication No. 40-33417 (JP, Y1) Special table Publication No. 63-503117 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04B 9/00-15/08 F04B 43/00- 47/14

Claims (8)

(57) [Claims] 1. An elastic diaphragm is formed by a working fluid that vibrates under pressure.
By changing the volume of the pump chamber periodically through
Liquid from the liquid supply source as the volume of the pump chamber increases.
Inhale your body into the pump chamber and
Pressure pump to discharge the liquid in the pump chamber from the pump chamber.
Pump, A pressure transmission chamber that is in contact with the pump chamber via an elastic diaphragm and
And a closed volume chamber including a pressure chamber communicating with the pressure transmission chamber
When, Pressure oscillation of the working fluid filled in the closed volume chamber
In order to change the volume of the pressure chamber periodically with a constant amplitude
Pressure adjusting means, A volume for increasing or decreasing the initial volume of the closed volume chamber is possible.
Variable adjustment means, Equipped withThe pressurizing chamber comprises a cylinder, The pressure vibrating means reciprocates in the cylinder.
Including The volume adjusting means can adjust the position in the cylinder.
Including a fitted adjusting piston Compressed delivery characterized by
Liquid pump. 2. A hydraulic adjusting cylinder, which is connected to the pressurizing chamber and has pressure adjusting means for adjusting the upper limit discharge pressure of the liquid in the pump chamber by setting the upper limit pressure of the working fluid. The pressure-feeding pump according to claim 1, which is characterized in that. 3. Pressure detection means for detecting the pressure of the working fluid in the pressurizing chamber and outputting an electrical measurement signal, and a conversion formula preset with the measurement signal from the pressure detection means as an input signal. The compression liquid transfer pump according to claim 1, further comprising: a calculation device that calculates a discharge pressure of the liquid from the pump chamber. Wherein said pressure transmitting chamber, hollow inner wall is an annular chamber made of an elastic diaphragm, removably the tubular container constituting the pump chamber into the inner hole of the hollow portion of the annular chamber The attached cylindrical container comprises an outer peripheral wall having an elastic recovery force in contact with the elastic diaphragm .
The pressure-feeding pump according to any one of 3 above. 5. A liquid from a liquid supply source is sucked into a pump chamber according to an increase in the volume of the pump chamber by periodically changing the volume of the pump chamber through an elastic diaphragm by a working fluid that vibrates under pressure. A compression transfer pump that discharges liquid in the pump chamber from the pump chamber according to a decrease in the volume of the pump chamber, wherein a pressure transmission chamber that is in contact with the pump chamber via an elastic diaphragm and a pressure chamber that communicates with the pressure transmission chamber A closed volume chamber including: a pressure adjusting means for periodically changing the volume of the pressurizing chamber with a constant amplitude in order to vibrate the working fluid filled in the closed volume chamber; and an initial volume of the closed volume chamber. A variable volume adjusting means for increasing / decreasing and adjusting the upper limit pressure of the liquid in the pump chamber by setting the upper limit pressure of the working fluid. A pressure adjusting chamber having means, the pressure transmitting chamber and the pressurizing chamber communicate with each other via a first fluid restrictor, and the pressurizing chamber and the hydraulic adjusting cylinder function as a second fluid restrictor. A pressure feed pump, which is communicated via the second fluid restrictor and has a diameter smaller than that of the first fluid restrictor. 6. The pressure transmission chamber has a hollow inner peripheral wall that is elastic.
It consists of an annular chamber composed of a diaphragm, and
The cylindrical container that constitutes the pump chamber is detachably mounted in the inner hole.
And the tubular container is in contact with the elastic diaphragm and has an elastic recovery force.
An outer peripheral wall having
The pressure delivery pump described. 7. A liquid from a liquid supply source is sucked into a pump chamber according to an increase in the volume of the pump chamber by periodically changing the volume of the pump chamber via an elastic diaphragm by a working fluid that vibrates under pressure. A compression liquid delivery pump that discharges liquid in the pump chamber from the pump chamber in accordance with a decrease in the volume of the pump chamber, wherein A closed volume chamber including: a pressure adjusting means for periodically changing the volume of the pressurizing chamber with a constant amplitude in order to vibrate the working fluid filled in the closed volume chamber; and an initial volume of the closed volume chamber. A variable volume adjusting means for increasing / decreasing the pressure, a pressure detecting means for detecting the pressure of the working fluid in the pressurizing chamber and outputting an electrical measurement signal, and the measuring signal from the pressure detecting means. Further comprising a calculating device for calculating the discharge pressure of the liquid from the pump chamber by a preset conversion equation using as an input signal, the pressure of the working fluid due to the operation of the pressure oscillating means from the measurement signal from the pressure detecting means. The amplitude of the vibration is detected, and when the amplitude does not reach a preset value, the volume variable adjustment means is operated to increase the volume of the pressure transmission chamber, thereby increasing the volume of the pressure transmission chamber, and thereby the pump chamber via the elastic diaphragm. The pressure-feeding pump, further comprising control means for reducing the volume of the air to remove air. 8. The pressure transmission chamber has a hollow inner peripheral wall that is elastic.
It consists of an annular chamber composed of a diaphragm, and
The cylindrical container that constitutes the pump chamber is detachably mounted in the inner hole.
And the tubular container is in contact with the elastic diaphragm and has an elastic recovery force.
8. An outer peripheral wall having:
The pressure delivery pump described.