JP2001241379A - Reciprocating pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reciprocating pump capable of improving maintenance performance while preventing pulsation, and capable of reducing possibility of liquid leak while preventing pulsation. SOLUTION: In this reciprocating pump composed of two diaphragms which reciprocate in contact with fluid being carried, a surface 1a of one diaphragm 1 in contact with the fluid and a surface 2a of the other diaphragm in contact with the fluid are provided to face each other roughly in parallel through a pump head 3 having a carrying passage, where a fluid carrying range is formed using the surface 1a of the diaphragm 1 in contact with the fluid surface, the surface 2a of the diaphragm 2 in contact with the fluid surface, and the pump head 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating pump, and more particularly, to a reciprocating pump constituted by using a diaphragm as a driving means for reciprocating.

[0002]

2. Description of the Related Art A reciprocating pump for driving a diaphragm to convey a fluid has been known. In such a reciprocating pump, the rotary motion obtained by a driving means such as a motor is converted into a linear reciprocating motion via a cam, and the diaphragm is driven by the linear reciprocating motion.

The above-described reciprocating pump according to the prior art is generally used for so-called metering injection when injecting a chemical or a drug. That is, a reciprocating pump configured using a diaphragm (hereinafter, also simply referred to as a “reciprocating pump”) has conventionally been provided at a location that requires constant-rate transport.

[0004] However, the reciprocating pump having the above-mentioned advantages (the advantage that the fluctuation of the discharge flow rate is small) also has the following problems. The reciprocating pump performs the transfer of the fluid based on the reciprocating motion of the diaphragm,
At this time, the fluid in the pump head is pressurized and pushed out by the forward movement of the diaphragm (hereinafter, referred to as “the fluid”).
This is referred to as the "forwarding process." ), When the diaphragm moves backward, the pressure inside the pump head is reduced and the fluid is drawn in (hereinafter, referred to as a “returning process”). In the reciprocating pump according to the related art, such a relatively fine operation of the forward movement step and the backward movement step is repeated a predetermined number of times in a predetermined time, thereby enabling a constant amount of transport as a whole. Comparing the process with the one return process, there is a large difference in the discharge flow rate between these processes (basically, no discharge is performed in the return process). That is, in the reciprocating pump according to the related art, there is a problem that a pulsation occurs in the transported fluid due to the difference in the discharge flow rate.

Therefore, as a technique for solving such a problem, recently, a reciprocating pump having a structure in which two pump heads each having a diaphragm are provided is known.

FIG. 5 is a schematic perspective view of a conventional reciprocating pump. In FIG. 5, a reciprocating pump 200 includes a first pump head section 210, a second pump head section 220, and a pump head section 21.
0, 220, and a check valve mechanism (for example, a valve section and a valve seat section) provided on the inflow side and the outflow side of the fluid in each of the pump head sections 210, 220. ) (Not shown). Here, the driving unit 230
For example, it is configured using an electric motor or the like.

[0007] The reciprocating pump 200 is connected to an inflow-side piping section 240 on the liquid inflow side and to an outflow-side piping section 250 on the outflow side. Specifically, the inflow side piping section 2
40, an inflow side flange portion 241, 242 provided in
The pump inflow side flange portions 213 and 223 are connected using bolts and the like, and the outflow side flange portions 251 and 252 provided in the outflow side pipe portion 250 and the pump outflow side flange portions 214 and 224 use bolts and the like. The reciprocating pump 200 and the pipes 240 and 250
And are connected.

Here, each of the connecting parts 211, 212,
One end of each of the pump heads 221 and 222 is
0,220 in a screwed state. Also, at the other end of each of the connecting portions 211, 212, 221, 222,
The flange portions 213, 214, 223, 224 are fixed.

The diaphragm contained in each of the pump heads 210 and 220 constituting the reciprocating pump 200 is such that when one of the diaphragms is in the forward movement step, the other is in the backward movement step, and the other diaphragm is in the backward movement step. Is in the backward movement step, the other diaphragm is constituted in the forward movement step.

That is, according to the reciprocating pump shown in FIG. 5, one diaphragm replaces the other diaphragm.
Since the other diaphragm is driven to complement the one diaphragm, it is possible to obtain a reciprocating pump capable of effectively improving the pulsation which has conventionally been a problem. In this reciprocating pump according to the prior art, each diaphragm is driven by using a cam having a 180 ° phase difference, and each diaphragm is moved in a predetermined direction (usually in a direction opposite to discharge). A biasing means (spring or the like) is provided to bias the power. That is, in the prior art, for each diaphragm,
A reciprocating pump is constituted by providing a cam and a biasing means.

[0011]

However, the reciprocating pump according to the prior art has the following problems.

When the reciprocating pump 200 is continuously used,
In accordance with the frequency of use, it is necessary to perform cleaning of the valve seat, etc., replacement of the diaphragm, replacement of the cam, replacement of the biasing means, etc. (so-called "maintenance processing"). Then, in order to perform such a maintenance process, each of the flange portions 213, 2
14,223,224,241,242,251,25
2 connection state, connection parts 211, 212, 221, 22
In addition to releasing the screwed state of No. 2, the pump heads 210 and 220 must be disassembled. Generally, since the pipe portions 240 and 250 are fixed to a wall surface or the like, each of the flange portions 213, 214, 223,
Only by releasing the connection state and the like of 224, 241, 242, 251, and 252, the connecting portion 211 having a check valve or the like is not provided.
This is because 212, 221, 222 cannot be removed.

That is, the reciprocating pump 2 according to the prior art
In the case of 00, when performing the maintenance processing, it is necessary to disassemble the pump head units 210 and 220 by removing a plurality of fastening means (bolts and the like) 219 and 229 constituting each pump head unit 210 and 220. is there. After the maintenance process, the pump heads 210 and 220 must be assembled again as a matter of course. That is, the reciprocating pump 20 according to the prior art
As for the maintenance process 0, it is necessary to extract the fluid to be conveyed in advance and then to disassemble and assemble the two pump heads 210 and 220, so that such work is complicated. was there.

Further, the reciprocating pump 20 according to the prior art
At 0, pulsation is prevented by using two pump heads 210 and 220. However, an increase in the number of pump heads means an increase in the number of parts. That is, the number of sealing portions also increases. Therefore, in the reciprocating pump 200 according to the related art, there is a problem that the possibility of liquid leakage increases as the number of sealing portions increases.

The present invention has been made in order to solve the problems of the above-described reciprocating pump according to the prior art, and provides a reciprocating pump capable of preventing pulsation and improving maintainability. The task is to
Another object of the present invention is to provide a reciprocating pump that can reduce the possibility of liquid leakage while preventing pulsation.

[0016]

That is, the present invention for solving the above-mentioned problem is directed to a reciprocating pump comprising two diaphragms which reciprocate in contact with a fluid to be conveyed. The liquid contact surface 1a of the diaphragm 1 and the liquid contact surface 2a of the other diaphragm 2 are provided so as to be substantially parallel to each other via a pump head 3 having a transport path, and the liquid contact surface of the one diaphragm 1 is provided. The surface 1a, the liquid contact surface 2a of the other diaphragm 2 and the pump head 3
The fluid transport region is formed by using (1) and (2). Here, the “fluid transfer area” is defined by driving each of the diaphragms 1 and 2 so that the pump head 3
Means an area in which the fluid can be appropriately transported without leaking to the outside of the pipe connected to the transport path.

According to the reciprocating pump according to the present invention, the diaphragms 1 and 2 are provided to face each other with the pump head 3 interposed therebetween. In comparison, it is possible to greatly reduce the number of parts when configuring the pump.
Therefore, as the number of components decreases, the number of sealing portions can be reduced as compared with the conventional case, and the possibility of liquid leakage can be reduced by the reduced number of sealing portions. Further, according to the reciprocating pump according to the present invention, since the pump head 3 is provided between the opposed diaphragms 1 and 2, the movement of one diaphragm adversely affects the other diaphragm. Without this, each diaphragm can appropriately carry out a predetermined movement. Therefore, according to the present embodiment, it is possible to obtain a reciprocating pump capable of appropriately maintaining the discharge flow rate of each diaphragm and effectively preventing the pulsation of the transport fluid.

In the reciprocating pump according to the present invention, the diaphragms 1 and 2 and the pump head 3 are provided.
It is preferable that the transfer fluid flow block 25 configured by using the liquid can be separated without leaking the fluid from the fluid transfer area. That is, the transported fluid is not in contact with the surfaces of the diaphragms 1 and 2 on the back side of the liquid contact surfaces 1a and 2a. It is preferable that the structure can be separated from a driving force supply unit or the like for driving each of the diaphragms 1 and 2 without causing leakage.

According to this preferred configuration, the maintenance process can be performed efficiently. That is, according to the reciprocating pump according to the present invention, the pipe section and the like are removed without disassembling the transport fluid flow block 25 and the maintenance of the driving force supply section (for example, the eccentric cam,
(Eg, replacement of the position regulating urging means), so that the maintenance process can be performed without disassembling and assembling the two pump heads as in the related art. Therefore, it is possible to obtain a reciprocating pump excellent in maintainability, capable of performing maintenance of the driving force supply unit and the like without previously removing the carrier fluid flowing in the carrier fluid circulation block 25.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic sectional view of a reciprocating pump according to an embodiment of the present invention. Also, FIG.
FIG. 2 is an enlarged view of a fluid transporting part constituting the reciprocating pump of FIG. 1, and FIG.
(B) shows a disassembled state. Further, FIG.
FIG. 4 is a sectional view taken along the line III-III, and FIG.
FIG. 4 is a sectional view taken along a line IV. Hereinafter, the reciprocating pump according to the present embodiment will be described in detail with reference to these drawings.

The reciprocating pump according to the present embodiment comprises a fluid transfer section 10 for realizing the transfer of fluid by reciprocating diaphragms (first diaphragm 1 and second diaphragm 2), and diaphragms 1 and 2. Driving force supply unit 4 that supplies hydraulic oil at appropriate timing to drive
0, and a driving unit 70 for driving the eccentric cam of the driving force supply unit 40 and the like.

The fluid transport section 10 constituting the reciprocating pump according to the present embodiment is specifically configured as shown in FIGS. 1, 2 and 4. In these drawings, a fluid transport unit 10 includes a first diaphragm 1, a second diaphragm 2, a pump head 3, and a diaphragm support (a second diaphragm support) that sandwiches and supports the diaphragms 1 and 2 together with the pump head 3. One diaphragm support 4 and a second diaphragm support 5) and the liquid contact surfaces 1 of the diaphragms 1 and 2
a and 2a sides, between the pump head 3 and each of the diaphragms 1 and 2, a carrier fluid circulating portion (first carrier fluid circulating portion 6 and second carrier fluid circulating portion 7); , 2 (the back surfaces of the liquid contact surfaces 1a, 2a) and between the respective diaphragm supports 4, 5 and the respective diaphragms 1, 2 (a first hydraulic oil circulating portion). 8 and a second hydraulic oil circulating section 9) and a pipe section (a first pipe section 21 and a second pipe section 22) for transmitting a driving force from a driving force supply section 40 (described later). It is configured using the formed hydraulic oil supply units (the first hydraulic oil supply unit 11 and the second hydraulic oil supply unit 12) and the like.

Here, each of the diaphragms 1 and 2 has, for example, a corrugated shape, a curved surface shape, or the like in cross section. However, in FIG. The typical cross-sectional shape is omitted.
The pump head 3 is formed with transport paths 3A and 3B for transporting the fluid. On the inflow side and the outflow side of these transport paths 3A and 3B, check valves (inflow side check valve 23 and outflow side check valve 24) are provided, respectively, as shown in FIG. Here, each check valve 23, 24
Is configured using two ball checks. Further, between each of the diaphragms 1 and 2 and the pump head 3, there is provided a transporting fluid flow section 6 or 7. A plurality of through-holes are formed in the transfer fluid circulation portions 6 and 7,
Positive pressure / negative pressure due to the reciprocating motion of the diaphragms 1 and 2 are transmitted to the transport paths 3A and 3B via the through holes. Then, the check valves 23 and 24 are opened and closed by the reciprocating motion of the diaphragms 1 and 2 (by the positive and negative pressures), and the fluid is conveyed.

Diaphragm supports 4, 5 are provided on the back side of the diaphragms 1, 2 via hydraulic oil circulating portions 8, 9. The diaphragm supports 4, 5 and the pump head 3 Diaphragms 1 and 2 are clamped and fixed. The diaphragm supports 4 and 5 and the pump head 3 are fastened by fastening means such as bolts. A plurality of through-holes are formed in the hydraulic oil flow sections 8 and 9, and the hydraulic oil supplied from the driving force supply section 40, which will be described later, passes through the through-holes to the rear surfaces of the diaphragms 1 and 2. Will be sent and discharged. Hydraulic oil supply units 11 and 12 communicating with the driving force supply unit 40 are attached to the hydraulic oil supply units 8 and 9.
Reference numerals 1 and 12 are fastened to the hydraulic oil flow sections 8 and 9 by bolts or the like.

Next, the driving force supply section 40 constituting the reciprocating pump according to the present embodiment is specifically configured as shown in FIGS. 1, 3 and 4. In these drawings, the driving force supply unit 40 includes a driving force transmission shaft 41 for transmitting a driving force from a driving unit 70 described later, and a driving force transmission shaft 4.
1 and the eccentric cam 42
(First piston portion 43 and second piston portion 44) reciprocating in response to the movement of the first piston portion 43 and first rotation supported by inner rings of bearings 47 and 47 in first piston portion 43 A shaft 45 and a second rotating shaft 46 supported by inner rings of bearings 48 and 48 in the second piston portion 44
And the first piston portion 43 in the second piston portion 44
And the second piston portion 44 are appropriately urged so that each of the rotating shafts 45, 46 provided in each of the piston portions 43, 44 is provided.
Is configured using a position regulating urging means 49 that functions to contact the eccentric cam 42 with the casing 50 and the like including these elements. In the driving force supply unit 40 having the above-described elements, the closed space between the inner wall of the casing 50 and the pistons 43 and 44 is filled with hydraulic oil.

In the driving force supply section 40 according to the present embodiment, the second piston section 44 includes therein a driving force transmission shaft 41, an eccentric cam 42, a first piston section 43, a bearing 48, and a position. It is formed so as to be able to include the regulating urging means 49 and the like. Then, the inner wall portion 44a of the second piston portion 44 and the outer wall portion 4 of the first piston portion 43
The position regulating urging means 49 is sandwiched between the position regulating urging means 49 and 3a.
In other words, the first piston portion 43 (the first rotation shaft 45 inside) and the second piston portion 44 (the second rotation shaft 45 inside) are always moved by the position regulating urging means 49. The eccentric cam 42 is appropriately urged so as to come into contact with the outer peripheral surface thereof.

Further, the casing 50 is provided with each pipe 2
A supply port (a first supply port 51 and a second supply port 52) for hydraulic oil is formed so as to communicate with the first and second ports 22. Therefore, in the present embodiment, each of the piston portions 43, 4
Positive pressure / negative pressure acts on the hydraulic oil according to the movement of 4,
Due to this pressure fluctuation, the hydraulic oil flows through each of the supply ports 51 and 52. And with this hydraulic oil,
The diaphragms 1 and 2 are driven.

Next, the drive section 70 constituting the reciprocating pump according to the present embodiment is configured as shown in FIGS. In these drawings, a driving unit 70 is configured using an electric motor 71 that generates a rotational motion, a gear unit 72 for transmitting the rotational force from the electric motor 71 to the driving force transmission shaft 41 described above, and the like. Have been.

As described above, the reciprocating pump according to the present embodiment is configured by using the fluid transfer unit 10, the driving force supply unit 40, the driving unit 70, and the like, and functions as follows.

In the reciprocating pump according to the present embodiment, first, the electric motor 71 is rotated, and this rotational force is transmitted to the driving force transmission shaft 41 via the gear 72.

Next, the eccentric cam 42 is rotated by the driving force transmission shaft 41, and the rotation of the eccentric cam 42 causes the first and second piston portions 43 and 44 to reciprocate. Here, based on the above-described configuration, the first piston portion 43 and the second piston portion 44 reciprocate integrally by one eccentric cam 42. Then, a predetermined force and a predetermined pressure act on the hydraulic oil by the reciprocating motion of the pistons 43 and 44, and the hydraulic oil is sent to and discharged from the pipes 21 and 22 through the supply ports 51 and 52. The Rukoto.

Next, the diaphragms 1 and 2 reciprocate at appropriate timings based on the hydraulic oil flowing through the pipe sections 21 and 22, and the movement of the diaphragms 1 and 2 causes the inflow-side check valve 23 to move. And the outflow side check valve 24 is operated, and the desired liquid is conveyed.

The reciprocating pump according to the present embodiment configured and functioning as described above has the following features based on at least one of the configuration and the function.

The reciprocating pump according to this embodiment has two diaphragms 1 and 2, each of which has a liquid contact surface 1 a or 2.
“a” is provided so as to be substantially parallel via the transport fluid circulation units 6 and 7 and the pump head 3. Further, on the back side of each of the diaphragms 1 and 2, there are provided diaphragm supports 4 and 5 via hydraulic oil circulating portions 8 and 9, respectively. That is, according to the present embodiment, the transport fluid flow block 25 is formed using the pump head 3, the diaphragm supports 4, 5, the transport fluid flow portions 6, 7, the hydraulic oil flow portions 8, 9, and the like. (See FIG. 2B). Note that the transport fluid flow block 25 is not limited to the above configuration, and may have another configuration as long as the transport fluid does not leak. For example, the diaphragms 1 and 2 may be fixed to the pump head 3, and these members may be used to form a transport fluid flow block.

In the transport fluid flow block 25 configured as described above, the space between the first diaphragm 1 and the second diaphragm 2 is formed as a closed space.
As shown in (b), even when the hydraulic oil supply units 11 and 12 are removed, the carrier fluid does not leak from the inside of the carrier fluid flow block 25.

Therefore, according to the reciprocating pump according to the present embodiment configured as described above, it is possible to efficiently perform maintenance processing. That is, according to the reciprocating pump according to the present embodiment, as shown in FIG.
Since the pipe sections 21, 22 and the like can be removed and maintenance of the driving force supply section 40 (for example, replacement of the eccentric cam 42 and the position regulating urging means 49) can be performed, two pumps can be used as in the related art. Maintenance processing can be performed without disassembling and assembling the head. Therefore,
In the present embodiment, it is possible to perform maintenance or the like of the driving force supply unit 40 without previously removing the carrier fluid flowing through the carrier fluid distribution block 25.
A reciprocating pump excellent in maintenance can be obtained.

The reciprocating pump according to the present embodiment also
Although two diaphragms are provided as in the related art, according to the present embodiment, since the two diaphragms are provided in one block (the transfer fluid flow block 25), two independent diaphragms are provided as in the related art. As compared with the case where the pump head is provided, it is possible to greatly reduce the number of parts when configuring the pump. Therefore, as the number of components decreases, the number of sealing portions can be reduced as compared with the conventional case, and the possibility of liquid leakage can be reduced by the reduced number of sealing portions.

Further, according to the reciprocating pump according to the present embodiment, since the pump head 3 is provided between the opposed diaphragms 1 and 2, the movement of one diaphragm adversely affects the other diaphragm. Without affecting
Each of the diaphragms can appropriately perform the predetermined movement. Therefore, according to the present embodiment, it is possible to obtain a reciprocating pump capable of appropriately maintaining the discharge flow rate of each diaphragm and effectively preventing the pulsation of the transport fluid.

[0040]

As described above, according to the present invention, it is possible to obtain a reciprocating pump capable of preventing pulsation and improving maintainability. Further, according to the present invention, it is possible to obtain a reciprocating pump capable of preventing pulsation and reducing the possibility of liquid leakage.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a reciprocating pump according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a fluid transporting section constituting the reciprocating pump of FIG. 1;

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a schematic perspective view of a reciprocating pump according to the related art.

[Explanation of Signs] 1 ... first diaphragm, 2 ... second diaphragm, 3
... Pump head, 4 ... First diaphragm support, 5 ...
2nd diaphragm support, 6 ... first transport fluid circulation section, 7 ... second transport fluid circulation section, 8 ... first hydraulic oil circulation section, 9 ... second hydraulic oil circulation section, 10 ... fluid Transport unit, 11
... first hydraulic oil supply unit, 12 ... second hydraulic oil supply unit, 2
DESCRIPTION OF SYMBOLS 1 ... 1st piping part, 22 ... 2nd piping part, 23 ... Inflow side check valve, 24 ... Outflow side check valve, 25 ... Carrier fluid distribution block, 40 ... Driving force supply part, 41 ... Driving force Transmission shaft, 42
... Eccentric cam, 43 ... First piston part, 44 ... Second piston part, 45 ... First rotation axis, 46 ... Second rotation axis,
47, 48 ... bearing, 49 ... position regulating urging means, 5
0: casing, 51: first supply port, 52: second supply port, 70: drive unit

Claims (2)

[Claims] 1. A reciprocating pump comprising two diaphragms which reciprocate in contact with a fluid to be conveyed, wherein a liquid contact surface (1a) of one diaphragm (1) and another diaphragm (2) are provided. ) Is provided so as to be substantially parallel to each other via a pump head (3) having a transport path, and is in contact with the liquid contact surface (1a) of the one diaphragm (1). A reciprocating pump in which a fluid transfer region is formed by using the liquid contact surface (2a) of the other diaphragm (2) and the pump head (3). 2. A carrier fluid flow block (25) constituted by the diaphragms (1) and (2) and the pump head (3) separates the fluid without leaking from the fluid transport area. 2. The reciprocating pump according to claim 1, wherein the pump is capable.