JPH0543274Y2 - - Google Patents

Description

The present invention relates to a diaphragm pump for conveying, in particular, chemically aggressive media, which has in a pump head an inlet valve and an outlet valve controlled by the conveyed medium, both of which, together with the pump head having a recess for receiving the valves, are made of a substantially chemically inert plastic.

PRIOR ART Diaphragm pumps, for example for generating vacuum, in which the inlet and outlet valves are controlled by the pressure difference of the conveying medium are described in German Patent Application No.
This is already known from specification 1,428,077.
In such a diaphragm pump, the upper part of the pump comprises a diaphragm connected to the connecting rod, an intermediate plate in which a compression chamber is formed, a valve plate arranged above the intermediate plate and a closing cover arranged above the valve plate. The diaphragm is fastened gas-tight and liquid-tight at its periphery between the metal housing and the intermediate plate, whereas the valve plate is tightly fastened, particularly in the edge area, between the intermediate plate and the closing cover. For such a diaphragm to function properly, an absolute seal is required above and below the valve plate as well as an absolute tight fitting of the diaphragm. If, for example, not only the housing but also the intermediate plate and the closing cover are made of metal, as in the case of diaphragm pumps of the type mentioned at the beginning, the required tightness can also be achieved, for example, if the valve plate is made of an inert plastic such as polytetrafluoroethylene (PTFE). It is necessary in particular to construct the valve plate and the associated reed valve from a chemically inert plastic, in particular PTFE, if the diaphragm pump must be suitable for conveying chemically aggressive or aggressive media. In order to convey chemically aggressive media, the intermediate plate and the closing cover, in addition to the working diaphragm, must be designed to have a corresponding chemical resistance to the conveyed media. Nevertheless, significant difficulties arise with the previously known pumps of the type mentioned at the beginning.

If the intermediate plate and the closing lid are made of metal, these parts have a corresponding rigidity and provide the required tightness, especially at the transition surface of the valve plate.
However, a disadvantage of constructing the closure lid and the intermediate plate from metal is that these parts do not have sufficient resistance to various aggressive conveying media. In any case, such resistance cannot be obtained using conventional and expensive materials.

Although not publicly known, it has been proposed to apply a PTFE coating to the metal intermediate plate and closure lid, at least on the surface that comes into contact with the conveying medium. In this configuration, although the valve plate and the diaphragm are well sealed against the pump casing due to the shape stability of the metal core of the closing lid and the intermediate plate, the closing lid or the intermediate plate The disadvantage that PTFE coatings do not constitute a permanent protection against aggressive media has become significant. This means that, since the conveying medium is corrosive or aggressive, it passes through the somewhat porous PTFE coating, and this passage takes place in particular in the valve region. As a result, the diaphragm pump loses its tightness and ceases to function.

Although not yet known to the public, diaphragm pumps have been experimentally tested in which the intermediate plate in the upper part of the pump as well as the closing lid are made entirely of PTFE. In that case, the entire upper part of the pump is made of chemically inert materials, so that the aforementioned disadvantages caused by aggressive conveying media are avoided, but at the expense of other disadvantages: It was found that this occurs. That is, the intermediate plate and the closing lid made of a pure PTFE block warped after a certain amount of pump operation time, and the sealing properties of the sealing surface were accordingly lost. Therefore, it is clear that when the closing lid, valve plate, and intermediate plate are made of PTFE, it is no longer possible to obtain sufficient airtightness between these three members in actual operation. be.

A diaphragm metering pump with two ball-shaped check valves in the suction conduit as well as in the conveying conduit is already known from DE 33 11 413, in which case a truncated conical sealing seat and The ball of the cooperating check valve is also made of a corrosion-resistant material, as is the seal seat. Moreover, the valves of known diaphragm metering pumps are arranged in the pump head, which is constructed essentially in one piece.

In particular, because the valve is designed as a ball check valve, the pump is designed rather as a low-speed metering pump and is hardly suitable for a high-speed pump drive. Furthermore, the dead space of the known pump, which is formed by the series-connected valves, in particular by the communication channels, is likewise large, which is a particularly significant disadvantage, for example, in the case of vacuum generation.

A diaphragm valve having two valves in the pump head which act as inlet or outlet valves under the control of the conveying medium is also disclosed in a West German patent application (which can be considered as direct prior art to the present invention). A valve is known from DE 2713599, which essentially consists of a valve disk and passages and passages arranged in the pump head and cooperating with said valve disk. The valve disk, which like the pump head is also made of corrosion-resistant plastic, is arranged in the middle section of a valve receiving recess which has three sections of different diameters. In this case, the smallest diameter section is in each case arranged at the initial point in the flow direction of the valve and is closed off by the valve disk in response to the stroke movement of the known pump. A generally dish-shaped or disk-shaped retaining member press-fit into the largest diameter section of the valve-receiving recess and having a through opening secures the valve disc in the recess on the opposite side of each valve disc. In this case, the opening of the holding element is arranged in such a way that even if the valve disc rests on the corresponding holding element and comes into contact with it, the valve disc cannot close the opening of the holding element. As a result of the stroke movement of this known diaphragm pump, the valve disc in each case either blocks the conveying medium flow by completely closing the smallest diameter section of the recess or opens the smallest diameter section. Therefore, it can flow.

The plastic valve disc, which serves as the valve member, does not unacceptably stick to the valve seat of the substantially integral pump head, which is also made of plastic.
Rather, in order to be able to follow the diaphragm movement of the known diaphragm pump at all times, the pump already has a valve disc made of polytetrafluoroethylene and a pump head made of polyphenylene oxide, in short with self-lubricating properties and non-stick properties. Each is manufactured from a plastic with specific properties.

In this known diaphragm pump, the valve plate is also omitted and the intermediate plate and closing cover are replaced by a substantially integral pump head, so that in this diaphragm pump the area between the closing cover and the valve plate or the valve plate is replaced by a substantially integral pump head. The old diaphragm sealing problems in the area of the intermediate plate no longer occur.

Instead, in the known diaphragm pump, the problem lies in the arrangement of the valve disc, which is permanently fixed in position in the valve-receiving recess by means of a press-fit retaining element. In the open state of the valve, the valve disk contacts a holding member having a through hole. However, the valve disc is hardly guided in the middle section of the recess, so that it depends on whether the valve disc rests concentrically or eccentrically on the retaining member (valve disc). The valve disks overlap the openings in the holding member to different degrees (even if the disks never completely close the openings in the holding member). Correspondingly, even in the open position, the resistance that the conveying medium has to overcome when flowing is different.

Furthermore, in the case of the known diaphragm pump, repair of the valve, for example replacement of the valve disc, is of course relatively difficult due to the press fit of the retaining member and the special shape of the recess for receiving the valve. .

In particular, in conjunction with the fixation of the valve disk by means of the holding element, the stroke height of the valve disk in the valve-receiving recess is also permanently determined. Therefore, even though the possibility of post-adjustment to a correct or optimum value is necessary and advantageous in the case of fast-running diaphragm pumps, such post-adjustment is no longer possible.

Problems to be solved by this invention Based on the above reasons, the problems to be solved by this invention are as follows.
A diaphragm pump of the type mentioned at the outset has been improved to be not only suitable for conveying chemically aggressive media, but also to facilitate adjustment and replacement of the valve part of the valve controlled by the conveyed medium. The goal is to make it possible.

Means for Solving the Problems The constituent means of the present invention for solving the above problems is such that each recessed portion for accommodating a valve is connected to the displacement chamber through a passage portion near the displacement chamber of the diaphragm pump. and a threaded hole or similar connection connecting outwardly to said valve chamber for a connecting plug having a through hole, said connecting plug each limiting the stroke height of the associated valve. The main feature is that it has a stopper surface.

The pump head of the diaphragm pump according to the invention is manufactured from a chemically inert material, such as PTFE, and is therefore completely resistant to the conveying medium.

Furthermore, the diaphragm valve according to the invention is easily adjustable by means of a stop surface of the connecting plug which controls its stroke height. The insertion depth of the connecting plug placed in the screw hole of the recessed part for accommodating the valve is variable. The movement clearance and the stroke height of the valve plate can be easily adjusted in such a way that the valve body or the valve plate operates approximately within its own resonance range. This allows rapid valve movement without large opening forces and at the same time with low energy consumption. This particularly contributes to improving the volumetric efficiency of the diaphragm pump of the present invention.

The valve parts of the inlet and outlet valves of the diaphragm pump of the invention can be made virtually equal and of the same dimensions and can be accessed relatively easily by disconnecting the connecting plug from the pump head. It is. This facilitates the manufacture, repair and maintenance of the diaphragm pump of the present invention.

According to an advantageous embodiment of the invention, the integral pump head is made of reinforced chemically inert plastic, in particular polytetrafluoroethylene reinforced with glass fibers.
Such a pump head has not only chemical neutrality with respect to the conveying medium, but also the necessary dimensional stability, in particular to ensure a reliable sealing effect at the clamping edge of the working diaphragm.

The valve of the diaphragm pump according to the invention or the plate-shaped valve body of the valve is supported in a pump head or in a valve guide sleeve provided in the pump head so as to be able to shift in the axial direction without spring load. Particularly advantageous. This not only eliminates additional sealing points, such as would occur in the case of a valve plate, but also avoids spring forces loading the plate valve. A plate valve is already known from German patent no. In this respect, the invalid space becomes larger, and the valve opening force also becomes larger due to the spring force. Since this opening force is generated by the conveying medium, the volumetric efficiency of the diaphragm pump necessarily decreases.

In an advantageous embodiment of the invention, the valve or the plate-shaped valve body of the valve has a plurality of crenel-like convexities arranged evenly distributed over the entire circumference of the valve body in its flow-through peripheral region. It has a dedicated section. This not only creates a flow surface for the conveyed medium in the open position of the valve body, but also creates a greater bending stiffness of the plate valve, at least sector by sector, in particular in the region of the sealing surface of the valve body.
This avoids undesirable deformations that would impair the mobility of the plate valve and/or the sealing properties of the plate valve. Advantageously, both the plate valve for the outlet and the plate valve for the inlet are designed identically, that is to say with the same contour. This also simplifies the manufacture, repair and maintenance of the diaphragm pump as well as the stocking of corresponding spare parts. In particular, there is no risk of mixing up parts when replacing the plate valve. In this case, care should be taken to install the plate valve in the correct position depending on whether it is installed on the inlet side or the outlet side.

In each valve chamber of the pump head, but in at least one valve chamber, a guide sleeve is provided for substantially axially guiding the associated valve body, the axial length of said guide sleeve being , is provided as a loading limit for the associated connecting plug and thus as a limit for the stroke height of the valve body. In this case, the inner cross-section of the guide sleeve is somewhat larger than the outer diameter of the valve body. It is also particularly advantageous for the guide sleeve to consist of a chemically inert material that does not contain glass fibers, in particular polytetrafluoroethylene.
A guide sleeve of this type has the effect, inter alia, that the outer periphery of the valve body wears out along the corresponding pump head, which is reinforced in particular with glass fibers, so that the cross section defined for the passage of the conveying medium widens. Therefore, the inconvenience that the working condition of the diaphragm pump of the present invention is impaired can be avoided. In summary, based on this arrangement of the guide sleeve, the selection of the material of the pump head is no longer limited due to the consideration of the valve body, and the pump head can be especially made of PTFE reinforced with glass fibers. becomes possible.

The connecting plug can also consist of a chemically inert plastic without glass fibers, in particular PTFE. This is because there is no frictional vertical movement of the valve body in the connection plug.

Advantageously, the pump head is fastened to the pump housing by a head cover plate arranged on its upper side. Such a head cover plate prevents the headed screw from acting locally on the plastic pump head. Rather, the flat surfaces of the pump head, especially the edge area, are clamped uniformly from both sides between the pump housing and the head cover plate, which contributes to dimensional stability.
In this case, a recess for the connecting plug is provided in the head cover plate.

the pump head is made substantially in one piece from a chemically inert plastic reinforced with a suitable insert, e.g. glass fiber, and
Particularly advantageous are pumps in which the guide sleeve of the valve body and the valve body itself are made of chemically inert plastics that do not contain glass fibers.

In a simple and advantageous embodiment of the invention, the diaphragm of the diaphragm pump according to the invention is constructed as a shaped diaphragm adapted to the three-dimensional shape of the displacement chamber formed in the pump head. By configuring the working diaphragm as a shaped diaphragm suitably matched to the displacement chamber, the diaphragm pump has a very small dead space and is also particularly suitable for vacuum generation. The edge of the shaped diaphragm is clamped in a seal-tight manner by means of the pump head to a correspondingly rigid metal pump casing.

The diaphragm pump according to the invention is suitable both for conveying conveying media in the liquid phase and for conveying conveying media in the gaseous phase, and is particularly effective as a vacuum pump due to its small dead space. can be used for.

Other embodiments of the invention are apparent from the dependent claims of the utility model registration claims.

Example Next, embodiments of the present invention will be described in detail with reference to the drawings.

The diaphragm pump 1 (FIG. 1) has a crank gear 3 built into the pump housing 2, which is drivingly connected to a diaphragm 5 via a connecting rod 4. A displacement chamber 6 is provided on the upper side of the diaphragm 5, which displacement chamber is limited by the diaphragm 5 and the pump head 7 or by a spherical curved portion 33 formed on the pump head. A diaphragm 5 is stretched between the lower pump casing 2 and the pump head 7. As a joint between the pump casing 2 and the pump head 7, a plurality of headed screws 8 are used, which load the pump head 7 with head cover plates 9 interposed therebetween.

The diaphragm 1 must be particularly suitable for aggressive conveying media. The parts of the pump that come into contact with the conveying medium are therefore made of chemically inert plastics, in particular polytetrafluoroethylene (PTFE). The pump head 7 is essentially molded in one piece from such a material and has a recess 10 for receiving a valve 11, 12, also made of a chemically inert material. In this embodiment, the outlet valve is designated by the reference numeral 11;
The inlet valve is also designated by the numeral 12. Note that the flow direction of the conveyance medium is clear from the arrows Pf1 and Pf2.

Each of the recessed portions 10 has a valve chamber 13 near the displacement chamber 6, and a valve body 14 is supported within the valve chamber. The valve chamber 13 communicates with the displacement chamber 6 via a short passage section 15 or a connecting port.
The passage section 15 is designed to be as short as possible in order to minimize the dead space. The internal cross-sectional area of the passage section 15 is significantly smaller than the cross-sectional area of the valve chamber 13. The inner opening surface of the valve chamber 13 forms a stop surface 34 for each valve body 14 closer to the displacement chamber. On the side facing the stop surface, the valve chamber 13 is delimited by a connecting plug 16 arranged in the recess 10 . The inner end surface 17 of the connecting plug 16 then forms a corresponding stop surface for the valve body 14, ie a stop surface that limits the valve chamber 13 (see FIG. 5). The connecting plug 16 has a central through hole 18 as a conveying medium inlet or a conveying medium outlet. Connection plug body 16
In this embodiment, the plug body is constructed as a screw stopper with a male thread, and the male thread is screwed into a corresponding female thread cut in the recessed part 10.

The outlet valve 11 and the inlet valve 12 are designed as plate valves and are also made of chemically inert material. The outlet and inlet valves each have an equal plate-shaped valve body 14, which has a substantially flat sealing side 19 and a flow-through side 21 (see FIGS. 2 and 3). ). On the flow side, a plurality of spacers 20 are arranged in the peripheral region of the flow side in the form of crenelations and evenly distributed over the entire circumference. The spacer 20 is aligned with the outer peripheral edge 22 of the valve body 14.
The height and mutual spacing of the crenelated spacers 20 are such that they are large enough to allow the conveying medium to flow when the spacers 20 come into contact with the limiting surface of the valve chamber 13 forming a stopper. It is configured in such a way that a flow cross section occurs. In addition, the outer diameter of the valve body 14 is the same as that of the valve chamber 1.
In contrast to the internal cross-section of No. 3, the arrangement is such that there is a sufficient flow cross-section on the side at the flow-through position of the outlet valve 11 or the inlet valve 12.

The valve body 14 has on its sealing side 19 a ring-shaped sealing edge 23 and an inwardly connecting recess 24 . The outer sealing edge 23 promotes a particularly good sealing effect, and the inner recess 24 reduces the mass of the valve body 14 without adversely affecting the stability of the valve body. . The spacer 20 provided on the other flow side 21 is arranged approximately in the area of the sealing edge 23 and supports and stabilizes it, so that
Undesirable deformations are largely avoided.

Since the spacer 20 is aligned with the outer peripheral edge 22 of the valve body 14, a guide sleeve 25 within the valve chamber 13 or provided in the valve chamber
The guide length of the valve body 14 inside is also extended. As a result, the valve body 1 is virtually cantilevered.
The tilting effect of 4 is also avoided.

The pump head 7 advantageously consists of PTFE reinforced with glass fibers to obtain the necessary stability. Valve body 14 fitted in valve chamber 13
In each valve chamber 13 a guide valve body 14 is provided in order to avoid the high abrasive effects caused by contact with the glass fiber-reinforced jacket material forming the valve chamber 13. In addition, a guide sleeve 25 is arranged to limit the sides. The guide sleeve 25 is made of plastic without glass fiber reinforcement, particularly preferably of PTFE, like the valve body 14 itself. Therefore, the side surfaces of the valve body 14 and the guide sleeve 25, which rub against each other during valve movement, do not have any reinforcing additives that would increase wear, so that even in this range of movement only very little wear occurs. do not have. Moreover, in the event of wear, the valve body 16 can be removed by unscrewing the connecting plug body 16 due to the special configuration of the valve.
4 can be quickly replaced.

As already mentioned, the outlet valve 11 and the inlet valve 12
The same valve body 14 is provided for both valve chambers 13, but as can be clearly seen in FIG. In the operating position shown in FIG. 1, both valve bodies 14 rest on a lower stop surface 34, which is formed by the limiting surface of the valve chamber 13 on the side of the displacement chamber 6. The operating position of this valve body is set in particular to the suction position, in which case the conveyed medium enters via the inlet valve 12, where it is passed from the side along the flow side 21 around the valve body 14. It flows and reaches inside the displacement chamber 6. At the same time, since negative pressure prevails in the displacement chamber, the passage section 15 of the outlet valve 11 is closed by the sealing side 19 of the valve body 14, which is fitted in the valve chamber of the outlet valve. .

Guide sleeve 25 arranged inside each valve chamber 13
is in contact with the end face of the valve chamber 13 near the displacement chamber 6 on one side, and the connecting plug 1 is connected from the other side.
It is held by 6. As can be seen in FIG. 5, the connecting plug 16 has a head 26 for engaging a rotating tool, a threaded part 27 connected to the head and having an external thread, and a threaded part following the threaded part. The outer diameter of the non-threaded portion is approximately equal to the diameter of the valve chamber 13. A reduced-diameter additional portion 29 is provided at the inner end of the connecting plug body 16, and the reduced-diameter additional portion forms, at its end, an inner end surface 17 that limits the upper part of the valve chamber 13. This reduced-diameter addition 29 extends somewhat into the guide sleeve 25, as can be seen in FIG. The ring-shaped end surface 30 between the non-threaded portion 28 and the reduced-diameter addition portion 29 forms a chamfered conical inner circumferential surface 32 (the fourth
(see figure) is loaded and held in the assembled position. The axial length of the reduced-diameter addition portion 29 is configured to cover the chamfered conical inner peripheral surface 32 of the guide sleeve 25 . In addition to the function of guiding the valve body 14, the guide sleeve 25 also has a function as a restriction member for restricting fitting and screwing of the connection plug body 16. In that case, the connection plug 16
The insertion depth of the inlet valve and the outlet valve, that is, the stroke height of the valve body 14 can be adjusted. This makes it possible to set a stroke height such that the valve body 14 operates approximately within its natural resonance range. In turn, the efficiency of the diaphragm pump 1 itself is also significantly improved, since the valve movement is much faster and, at the same time, requires less energy.

A stepped hole 31 is bored in the connecting plug body 16, and the upper hole portion, which has a somewhat larger cross-sectional area and is located closer to the outside, has an internal thread for screwing the connecting conduit. A lower hole portion of the stepped hole 31 opens into the valve chamber 13 . The chamfered conical inner circumferential surface 32 of the guide sleeve 25 serves as an introduction aid when the connecting plug 16 is inserted or screwed in, and also serves as a deformation zone for compensating production errors.

The diaphragm 5 is constructed as a shaped diaphragm, and the shaped side of the diaphragm facing the displacement chamber 6 is adapted to the displacement chamber 6, so that the diaphragm 5 is displaced in the top dead center position in a known manner. The chamber 6 is completely closed off, thereby reducing the dead space. In this case, a cutout corresponding to the displacement chamber 6 is provided in the pump head 7.

By means of the anti-rotation mechanism 35, which is still shown in FIGS. 6 to 8, both connecting plugs 16
is held in the set position. This allows the connection plug 1 to be used especially when installing or removing the screws.
6 is prevented from rotating. As already mentioned, it is possible to adjust the volumetric flow within certain limits by screwing in the connecting plug 16 after the pump has been assembled. Once the correct value is set, the position is fixed by the anti-rotation mechanism 35, so that accidental movement no longer occurs when the pump is in use. An O-ring 37 is assigned to each anti-rotation mechanism 35, which on one side is connected to the outer receiving groove 3.
8 and, on the other side, in an annular groove 42 provided in the head 36 of the connecting plug 16. The outer receiving groove 38 is formed between the head cover plate 9 and the pressure ring 39, and in order to form the receiving hole 38, the head cover plate 9 and the pressure ring 39 are mutually connected. The inner peripheral edge facing each other is a diagonally chamfered part 4.
0.41. two pressure rings 39
(see FIG. 7) is held by a plurality of screws 43 screwed into the head cover plate 9.
By the way, both the oblique chamfers 40 and 41 and the annular groove 42 in the connection plug body 16 allow each O-ring 37 to be pushed into the annular groove 42 or the outer wall of the connection plug body 16 in the radial direction when the pressure ring 39 is tightened. It is configured as follows. As a result, the connecting plug 16 is held in a positive manner, so that rotation of the valve body 14 or the connecting plug 16 is no longer possible.

As mentioned in the introduction, the valve body 14 may be made of PVDF (polyvinylidene fluoride) instead of PTFE. Valve body 14 can then advantageously be manufactured simply by injection molding. If the conveying medium does not allow the use of a PVDF valve body, the valve body is made of PTFE.

Effects of the invention The design of the invention provides a particularly good sealing of the working diaphragm to the metallic pump casing and complete chemical resistance against chemically aggressive conveying media.

[Brief explanation of the drawing]

Figure 1 shows one of the diaphragm pumps according to the present invention.
A schematic longitudinal sectional view of the embodiment, FIG. 2 is a cross-sectional view of the valve body, FIG. 3 is a plan view of the valve body, FIG. 4 is a sectional view of the guide sleeve for the valve body, and FIG. 5 is the left side. Figure 6 is a partial side view of a pump head with a rotation prevention mechanism on the connector body, and Figure 7 is a diagram showing the right half in a side view. FIG. 8 is a detailed view of the O-ring area belonging to the anti-rotation mechanism. DESCRIPTION OF SYMBOLS 1... Diaphragm pump, 2... Pump casing, 3... Crank transmission, 4... Connecting rod, 5... Diaphragm, 6... Displacement chamber, 7
...Pump head, 8...Screw with head, 9...
...Head cover plate, 10...Recessed portion, 11
...Outlet valve, 12...Inlet valve, Pf1, Pf2...
Flow direction, 13... Valve chamber, 14... Valve body, 15...
...Passway portion, 16...Connection plug body, 17...Inner end surface, 18...Central through hole, 19...Seal side, 2
0... Spacer, 21... Flowing side, 22... Outer periphery, 23... Seal edge, 24... Recess, 25...
... Guide sleeve, 26 ... Head, 27 ... Threaded part, 28 ... Part without threads, 29 ...
...Reduced diameter addition portion, 30...Ring-shaped end surface, 31...
...Stepped hole, 32... Chamfered conical inner peripheral surface, 33...
... Spherical curved part, 34 ... Lower stopper surface,
35... Rotation prevention mechanism, 36... Head, 37...
... O-ring, 38 ... Receiving groove, 39 ... Pressure ring, 40, 41 ... Diagonal chamfer, 42 ... Annular groove, 43 ... Screw.

Claims (1)

[Claims for Utility Model Registration] 1. The pump head 7 has an inlet valve 12 and an outlet valve 11 that are controlled by the conveying medium, and the valves 11, 12 and the recessed part 10 for accommodating the valves. In a diaphragm pump for conveying particularly chemically aggressive media, the recess 1 for receiving the valve is of the type in which the pump head 7 and the pump head 7 are both made of substantially chemically inert plastics.
0 are connected externally to the valve chamber 13 for the purpose of a valve chamber 13 communicating with said displacement chamber 6 via a passage section 15 near the displacement chamber 6 of the diaphragm pump 1 and a connecting plug 16 having a through hole 18, respectively. a threaded hole or similar connection which connects towards the direction, the connection plugs 16 each being connected to the associated valve body 14.
A diaphragm pump characterized in that it has a stop surface 17 that adjustably limits the stroke height of the diaphragm pump. 2. Diaphragm according to claim 1, in which the integral pump head 7 consists of a chemically inert reinforced plastic, such as polytetrafluoroethylene reinforced with glass fibers. pump. 3 At least one valve chamber 13 of the pump head 7
A guide sleeve 25 is provided therein for substantially axially guiding the associated valve body 14, which limits the insertion depth for the associated connection plug 16 and thus the stroke of the valve body 14. The diaphragm pump according to claim 1 or 2, wherein the height is defined by the axial length of the guide sleeve 25. 4. The inner cross section of the guide sleeve 25 is larger than the outer diameter of the valve body 14 guided within the guide sleeve, and the valve body 14, its guide sleeve 25, and the connecting plug body 16 are made of reinforced glass fiber. 3. The diaphragm pump of claim 3, wherein the diaphragm pump is made of a chemically inert material, such as polytetrafluoroethylene, free from polytetrafluoroethylene. 5. The two valves 11 and 12 are provided with substantially the same plate-shaped valve body 14, and each plate-shaped valve body 14 has a substantially flat sealing side 19 and a passage holding the spacer 20. It has a flow side 21,
A diaphragm pump according to any one of claims 1 to 4 of the utility model registration claims. 6. The valve body 14 is provided in the pump head 7 or in the valve guide sleeve 25 provided in the pump head.
A diaphragm pump according to any one of claims 1 to 5, wherein the diaphragm pump is supported so as to be shiftable in the axial direction without spring loading. 7 Utility model registration claim 1, in which the valve body 14 has convex portions 20 that are evenly distributed over the entire circumference of the valve body 14 in the peripheral area of the flow side 21 thereof. Any 1 from paragraph to paragraph 6
Diaphragm pump as described in section. 8. The valve body 14 has a ring-shaped seal edge 23 on the seal side 19 and a recess 24 connected radially inward to the seal edge, and is provided on the other side of the valve body 14. The diaphragm pump according to any one of claims 1 to 7, wherein the protruding portion 20 located substantially within the range of the sealing edge 23. 9 The guide sleeve 25 is connected to the associated connecting plug 16
According to the utility model registration request, the chamfered conical inner circumferential surface 32 on the opposite side is used as an introduction aid for the valve body 14 and as a deformation zone for compensating manufacturing errors related to the axial length of the guide sleeve 25. The diaphragm pump according to any one of the ranges 3 to 8. 10 The pump head 7 is fixed to the pump casing 2 by a head cover plate 9 provided above the pump head 7, as described in any one of claims 1 to 9 of the utility model registration claims. diaphragm pump. 11 The diaphragm 5 is configured as a molded diaphragm that matches the three-dimensional shape of the displacement chamber 6 formed in the pump head 7, as claimed in any one of claims 1 to 10 of the utility model registration claims. Diaphragm pump. 12. The diaphragm pump according to any one of claims 1 to 11, wherein a rotation prevention mechanism 35 is provided for the connection plug body 16. 13 The anti-rotation mechanism 35 has an O-ring 37 that engages with the circumferential surface of the head 36 of the connection plug 16, and the O-ring has a cross section between the head cover plate 9 and the pressure ring 39. Utility model registration claim No. 1 supported in the variable receiving groove 38
Diaphragm pump described in item 12. 14 The receiving groove 38 includes a diagonal chamfer 40 on the outer inner peripheral edge of the connection plug notch provided in the head cover plate 9, and a pressure ring 39 that surrounds one connection plug notch. The diaphragm pump according to claim 13, which is formed by a diagonal chamfered portion 41 on the inner peripheral edge of the diaphragm pump. 15 The connecting plug body 16 has an annular groove 42 for partially accommodating the O-ring 37, and the annular groove 42
is the receiving groove 38 in the use position of the connection plug 16.
The diaphragm pump according to claim 13 or 14 of the utility model registration, wherein the diaphragm pump is arranged at a height substantially equal to the height of the pump.