JPH0656150B2 - Diaphragm pump - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm pump, and more particularly, to a suction valve body and a discharge valve body formed on a tongue extending from a valve membrane and a base body. Related to the structure of the valve seat.

(Prior Art) A diaphragm pump alternately opens and closes a valve body for suction and a valve body for discharge to pump a fluid, and is widely used as a small pump such as an inhaler or an automatic pressurization sphygmomanometer. There is. The valve body of this type of diaphragm pump is formed on a tongue piece extending from a thin film valve body made of an elastic material such as CR. The valve membrane is mounted on a pressure chamber and oscillated at high speed by a motor. The pulsation of the fluid pressure in the pressure chamber causes the intake valve element and the exhaust valve element to alternately contact and separate from the valve seat to pump the fluid to the load side and gradually increase the fluid pressure element on the load side. There is.

(Problems to be Solved by the Invention) Such a diaphragm pump is required to have a high degree of precision, and in particular, the contact and separation characteristics of the intake valve element and the discharge valve element with respect to the valve seat vary. Therefore, the pressure on the load side cannot be smoothly increased. Further, a diaphragm pump of this type is generally assembled by placing the valve membrane on a pressure chamber formed in a base body, attaching a lid from above, and screwing the corners of the base body and the lid body together. Therefore, if the screwing force of the screw varies and the valve body is twisted even slightly, the contacting / separating property of the valve body with respect to the valve seat is deviated, and the pump characteristics are deteriorated.

In view of the above points, the present invention has an object to provide a diaphragm pump having excellent contact and separation properties with respect to a valve seat of a valve body.

(Means for Solving the Problem) For this purpose, the present invention mounts a valve membrane 3 made of an elastic material on the upper part of a pressure chamber 7 formed in the base body 2 and extends integrally to the valve membrane 3 from the side thereof. Is provided with a tongue piece 22, and the tongue piece 22 has a cantilevered suction valve body 23 and discharge valve body 2.
4 are arranged side by side so that their bases are on the same side, and a lid 4 for fixing the valve membrane 3 from above is linearly pressed and fixed near the base to fix the same surfaces of the valve bodies 23, 24. The valve seats 13 and 16 integrally formed on the base 2 are brought into contact with and separated from the same surfaces 13a and 16a, respectively.

(Operation) According to the above configuration, since the suction valve body 23 and the discharge valve body 24 are provided side by side on the tongue piece 22 integrated with the valve membrane 3, the entire shape can be made compact as a matter of course. Since the valve body forming positions are concentrated at one place, the forming size can be easily controlled, the influence on the valve membrane 3 can be reduced, and high precision can be achieved.

Moreover, since the vicinity of each valve body base is linearly pressed and fixed at the juxtaposed position, it becomes easy to adjust the pressing position and the pressing amount,
It is possible to suppress the occurrence of twisting due to the fixing force at the valve-opening bending base portion of the cantilevered valve body, and it is possible to enhance the contact / separability with respect to the valve seat.

In addition to such a configuration in which straight lines are fixed in parallel, with respect to the valve seat, a reference surface where the lower surfaces of the intake valve element 23 and the exhaust valve element 24 come into contact with each other, that is, the upper surfaces 13a and 16 of the valve seats 13 and 16
Since a is formed at the same position on the same surface of the base body 2 and in parallel with the valve body positions, the upper surface 13a,
16a can be molded with the same mold with high accuracy without variations in accuracy, and therefore the valve seat upper surfaces 13a, 1 of both valve bodies 23, 24 can be formed.
It is possible to open / close both valve bodies 23 and 24 regularly by equalizing the contact and separation properties with respect to 6a, and to smoothly increase the pressure on the load side.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings by taking a diaphragm pump for an automatic pressurization type blood pressure monitor as an example.

FIG. 1 is an exploded perspective view of a diaphragm pump according to the present invention, and FIGS. 2 to 4 are plan views and bottom views in an assembled state.
1 is a vertical cross-sectional view showing a diaphragm pump 1 on which a base body 2 made of synthetic resin, a thin-film disc-shaped valve membrane 3 made of an elastic material such as CR mounted on the base body 2, and the valve membrane 3 are mounted. The lid 4 is made of synthetic resin. The base portion 2 is composed of a substantially circular portion 5 and a substantially square portion 6 connected to the substantially circular portion 5, and a pressure chamber 7 is provided in the upper surface of the substantially circular portion 5 so as to be recessed in a substantially mortar shape (FIG. 5, FIG. See also Figure 6.)

Reference numerals 8 and 9 denote a suction passage and a discharge passage which are formed in a groove shape from the pressure chamber 7 toward the substantially square portion 6. The suction portion 8 is formed straight, but the discharge passage 9 has a substantially V shape. It is formed by refracting on the way. In this way, the suction passage 8 of relatively low pressure
If the discharge passage 9 of higher pressure is bent and formed so as to be straight, the fluidity of the fluid in the high-pressure discharge passage 9 is suppressed and the pressure balance between the passages 8 and 9 is ensured. The valve body 23 and the discharge valve body 24 can be alternately opened and closed in a regular manner, which is particularly effective when the valve membrane 3 is vibrated at high speed to transport a fluid at high pressure.

Reference numeral 11 denotes a circular concave portion provided at the tip of the suction passage 8, a suction hole 12 is formed at the center of the concave portion 11, and an annular valve seat 13 projects at the peripheral edge of the suction hole 12. It is set up. 12a is a suction pipe communicating with the suction hole 12,
It is provided on the lower surface of the substantially rectangular portion 6.

Denoted at 15 is a substantially rectangular recessed portion provided at the tip of the discharge passage 9. Discharge holes 17 and 18 are provided on both sides of a valve seat 16 projecting at the center of the recessed portion 15 in a generally U-shape. Has been formed. 17a and 18a are discharge pipes communicating with the discharge ports 17 and 18 (see also FIG. 7).
7a communicates with, for example, a cuff band (not shown), and the other discharge pipe 18a communicates with a sound collecting microphone (not shown). 1
Reference numerals 9 are coupling bosses formed at the four corners of the base 2.

Reference numeral 22 denotes a tongue piece that laterally extends from the valve leaflet 3 (first
(See also FIGS. 0 to 12)), a suction valve body 23 and a discharge valve body 24 are juxtaposed on the tongue piece 22 and are cut out in a cantilever shape. Both valve bodies 23, 24 are thinly formed on the same plane by providing a paragraph difference t from the upper surface of the tongue piece 24. The valve membrane 3 is placed on the substantially circular portion 5, and the tongue piece 22 is placed on the substantially rectangular portion 6. Valve seat 1
The upper surfaces 13a, 16a, which are the same surface of the third and the third surfaces 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, 16a, and 16a, which are freely contactable and separable (see also FIGS. 8 and 9).

Here, the valve seats 13 and 16 are both formed on the upper surface of the base 2. Therefore, the contact / separation surfaces where the lower surfaces of the valve bodies 23 and 24 contact and separate, that is, the upper surfaces 13a and 16a of the valve seats 13 and 16 are
Since they are formed on the same surface of the base body 2, it is possible to equally open and close the valve bodies 23 and 24 in order to open and close them regularly, and to smoothly increase the pressure on the load side. Further, the upper surfaces 13a and 16a of the valve seats 13 and 16 are inclined surfaces having an upward slope from the base end side of each valve body 23 and 24 toward the tip free end side, and therefore both valve bodies 23 and 24 are Reference numeral 24 is inclined upward toward the free end side of the tip and is provided on each upper surface 13a, 16a. In this way, when the valve bodies 23, 24 are inclined and abuttingly contacted with the valve seats 13, 16, the ports 12, 1 are
When a fluid pressure is applied to the side that opens 7, 18, the valve bodies 23, 24 rise well and can be separated from the valve seats 13, 16 to instantly open the ports 12, 17, 18. . Reference numeral 25 denotes a drive member that is provided upright in the center of the upper surface of the valve membrane 3, and a fitting port 26 for an eccentric pin 34 that is driven and rotated by a motor 33 described later is formed in the upper portion of the drive member 25.

A circular opening 28 corresponding to the valve membrane 3 is formed on one side of the lid body 4 (see also FIGS. 13 and 14). A discharge pipe 29 is erected on one side of the upper surface of the lid body 4. The discharge pipe 29 is located above the recess 15 and communicates with the recess 15, and a fine constant speed leak valve 30 is inserted in the upper portion thereof.

Reference numeral 31 is a standing wall that is erected on the rear portion of the lid body 4.
The motor 33 is fitted and disposed in the recess 32 formed in 1. Reference numeral 34 denotes an eccentric pin that is driven and rotated by a motor 33. When the pin 34 is fitted into the fitting hole 26 of the driving body 25 and the motor 33 is driven, the valve membrane 3 vibrates vertically on the pressure chamber 7.

Reference numeral 35 denotes coupling bosses formed at the four corners of the lid body 4. By aligning the bosses 35 with the bosses 19 formed at the four corners of the base body 2 and screwing in screws 36a to 36d, the base body 2 and the lid are closed. Connect body 4. At that time, both valve bodies 23, 24
The valve bending base is linearly pressed and fixed by the lid body 4, and both are formed on the same plane with a paragraph difference t from the upper surface of the tongue piece 22, so that the screws 36a to 36d are screwed in. Even if the forces vary, the valve bodies 23 and 24 are difficult to twist, and the upper surfaces 13a and 16a of the valve seats 13 and 16 are not twisted.
Surely abut. Further, even if the screwing forces of the screws 36a to 36d are varied and the valve bodies 23 and 24 are slightly twisted, the valve bodies 23 and 24 are twisted in substantially the same manner. , 24 valve seats 13, 1
Since the contact / separation property with respect to 6 also decreases in a similar manner, both valve bodies 2
Alternate contact and separation timings of the valve seats 3 and 24 with respect to the valve seats 13 and 16 do not greatly deviate from each other.
Can alternately open and close regularly to boost the load side.

That is, as shown in FIG. 15, when the paragraph difference t is provided only on one valve body 23 and the other valve body 24 is formed on the same plane as the upper surface of the tongue piece 22 without the paragraph difference t, the screw 36
When assembling by screwing a and 36b into the bosses 35 and 19,
If the screwing forces of the screws 36a and 36b are not uniform, the valve bodies 23 and 24 are not on the same plane, so
There is a considerable difference between the stresses generated in the valves 3 and 24, and therefore the valve bodies 23 and 24 do not twist in a substantially similar manner, and the contacting and separating properties of the valve bodies 23 and 24 with respect to the valve seats 13 and 16 are the same. Therefore, both valve bodies 23 and 24 do not open and close alternately and regularly, and the pressure on the load side cannot be normally increased.

However, each valve element 23, 2 of the diaphragm pump 1 is
No. 4 is formed by providing a paragraph difference t from the upper surface of the tongue piece 22, so that such a problem does not occur. In addition, each valve body 2
By forming the rib 40 having a triangular cross-section so as to surround 3, 24, it is possible to identify the pressing position by the screw at the time of assembly and further suppress the twist of the valve bodies 23, 24.

The diaphragm pump 1 is configured as described above,
When the motor 33 is rotated, the valve membrane 3 vibrates up and down, and the air flows from the suction hole 12 into the pressure chamber 7 through the suction passage 8 and further into the discharge hole 17 through the discharge passage 9 and the discharge pipe 17a.
And is sent to a cuff belt (not shown) through the pipe to increase the internal pressure of the cuff belt. Here, the upper surfaces 13a of the valve seats 13 and 16 are
Since 16a has an inclined surface as described above, both valve bodies 23 and 24 open and close well, and smoothly pressurize the cuff band. When the pressure in the cuff band is increased to a predetermined pressure, the air in the cuff band flows backward, enters the recess 15 from the discharge hole 17, and is gradually discharged to the outside through the leak valve 30 of the discharge pipe 29. . At that time, the discharge sound is the other discharge pipe 1.
Sound is collected by a sound collecting microphone (not shown) communicating with 8a.

Although the above embodiment has been described by taking the diaphragm pump 1 applied to the automatic pressurization type blood pressure monitor as an example, the diaphragm pump according to the present invention can be applied to other devices such as an inhaler.

(Effects of the Invention) As described above, according to the present invention, the valve membrane 3 made of an elastic material is mounted on the upper portion of the pressure chamber 7 formed in the base body 2, and the valve membrane 3 is integrally extended from the side thereof. A tongue piece 22 is provided, and the tongue piece 22 has a cantilevered suction valve body 23 and discharge valve body 24.
Are installed side by side so that each base is on the same side,
The valve body 3 is fixed from above by a lid 4 which linearly presses and fixes the vicinity of the base portion, and the same faces of the valve bodies 23 and 24 are attached to the valve seats 13 and 16 integrally formed on the base body 2. Since they are brought into contact with and separated from the same surface 13a, 16a, respectively, the valve bodies 23, 24 are formed integrally with the valve membrane 3 made of a rubber-like elastic material, which is troublesome in dimension control. Since the intake and exhaust valve bodies 23 and 24 are formed side by side centrally in one place, molding is performed by controlling the vulcanization temperature, vulcanization time, filling amount, etc. of the vulcanization process of rubber and the like. The dimensional control becomes easy and the accuracy can be improved.

Moreover, since both valve bodies 23 and 24 are arranged side by side and linearly press and fix the vicinity of the valve opening bending base, it is easy to adjust the pressing position and the pressing amount, and it is possible to suppress the occurrence of twisting of the base due to the fixing force. It is possible to increase the contact and separation properties with respect to the seat. Due to such a configuration in which the valves are arranged side by side and fixed in a straight line, the surface accuracy on the same side of the valve bodies 23 and 24 is enhanced, and the valve seats 13 and 16 are also arranged so as to be integrated with the base body 2 and to face the valve bodies. By being provided, the accuracy of the same surface can be improved, the assembling property can be improved, and the mass productivity can be high, and the contacting and separating properties of the both can be high, and the pump performance can be improved.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is an exploded perspective view of a diaphragm pump, FIG. 2, FIG. 3 and FIG. 4 are plan views, bottom views and longitudinal sectional views in an assembled state. , Fig. 5,
6 and 7 are a plan view, a vertical sectional view and a lateral sectional view of the base body.
8 (a) and 8 (b) are sectional views of the suction portion and a plan view of the valve seat, respectively, and FIGS. 9 (a) and 9 (b) are sectional views of the discharge portion and a plan view of the valve seat, respectively. Figures 11, 11 and 12 are a plan view, a rear view and a sectional view of the valve membrane, FIGS. 13 and 14 are a plan view and a longitudinal sectional view of the lid body, and FIG. 15 is a perspective view for reference. is there. 1 ... Diaphragm pump 2 ... Base body 3 ... Valve membrane 7 ... Pressure chamber 13, 16 ... Valve seat 13a, 16a ... Same surface of valve seat 22 ... Tongue piece 23 ... Intake valve body 24 ... Discharge valve body

Claims (1)

[Claims] 1. A valve membrane (3) made of an elastic material is mounted on an upper part of a pressure chamber (7) formed in a base body (2), and a tongue piece (22) integrally extending from the side of the valve membrane (3) is provided. A cantilevered suction valve body 23 and a discharge valve body 2
4 are juxtaposed so that their bases are on the same side, and the lid 4 for fixing the valve membrane 3 from above is linearly pressed and fixed in the vicinity of the base so that the same surface of each valve 23, 24 is fixed. A diaphragm pump characterized in that the valve seats 13, 16 integrally formed with the base 2 are brought into contact with and separated from the same surfaces 13a, 16a, respectively.