CN220395972U - One-way diaphragm pump of play water - Google Patents

Abstract

The utility model discloses a water outlet unidirectional diaphragm pump, which comprises a pump head body, wherein a water inlet cavity, a water outlet cavity, a first pressurizing cavity and a second pressurizing cavity are arranged in the pump head body, the water inlet cavity and the water outlet cavity are respectively communicated with a water inlet and a water outlet, the water inlet cavity is respectively communicated with the first pressurizing cavity and the second pressurizing cavity through a first water inlet unidirectional diaphragm and a second water inlet unidirectional diaphragm, a first water passing cavity and a second water passing cavity which are both communicated with the water outlet cavity are also arranged in the pump head body, a first water sealing lantern ring and a force lock type first water stopping component for controlling the water passage at the first water sealing lantern ring to be communicated with or blocked are formed in a water passage communicated with the first pressurizing cavity, and a second water passing cavity and a second water sealing lantern ring and a force lock type second water stopping component for controlling the water passage at the second water sealing lantern ring to be communicated with or blocked are formed in a water passage communicated with the second water passage. The utility model is used for improving the tightness between the pressurizing cavity and the water outlet cavity, avoiding the phenomenon of dripping water under the pressurized water source and reducing the waste of the water source.

Description

One-way diaphragm pump of play water

Technical Field

The utility model relates to the technical field of fluid conveying equipment, in particular to a water outlet unidirectional diaphragm pump.

Background

The diaphragm pump is a pump water component commonly used in fluid transportation, and the principle is that a motor drives an eccentric component to make eccentric motion, so that a pressurizing cavity of the diaphragm pump is extruded or pulled, and water is sucked or pumped out.

A water outlet one-way diaphragm is arranged on a water outlet water path of the existing diaphragm pump, wherein the pressurizing cavity and the water outlet cavity are communicated with each other, but under the action of a pressurized water source, the water outlet one-way diaphragm is easy to push open, the water stopping function of the water outlet one-way diaphragm is weaker, the water outlet end of the diaphragm pump is easy to drip, and the water source is wasted.

Disclosure of Invention

The utility model aims to provide a water outlet unidirectional diaphragm pump which is used for improving the tightness between a pressurizing cavity and a water outlet cavity, avoiding the phenomenon of dripping under a pressurized water source and reducing the waste of the water source.

In order to solve the technical problems, the utility model adopts the following scheme:

the utility model provides a go out one-way diaphragm pump of water, includes the pump head body, is equipped with inlet chamber, water outlet chamber, first booster chamber, second booster chamber in the pump head body, inlet chamber, water outlet chamber are put through with water inlet, delivery port respectively, respectively through first inlet one-way diaphragm, second inlet one-way diaphragm switch-on between inlet chamber and first booster chamber, the second booster chamber, still be equipped with in the pump head body all with the first water cavity that goes out the water chamber switch-on, the second water cavity that crosses, the first water channel that crosses the water channel that crosses and first booster chamber switch-on constitutes has first water sealing lantern ring and the first water stopping component of power locking type that controls first water sealing lantern ring department water channel switch-on or block, the second water channel that crosses the water channel that water channel and second booster chamber switch-on is formed has second water sealing lantern ring and the power locking type second water stopping component that controls second water sealing lantern ring department water channel switch-on or block.

By adopting the technical scheme, source water enters the water inlet cavity through the water inlet, and is sucked into the first pressurizing cavity and the second pressurizing cavity through the first water inlet one-way diaphragm and the second water inlet one-way diaphragm respectively, then the source water is pumped into the first water passing cavity and the second water passing cavity respectively by the first pressurizing cavity and the second pressurizing cavity, and then enters the water outlet cavity to be finally output by the water outlet, the water absorption and pumping processes of the diaphragm pump are completed, the first pressurizing cavity and the first water passing cavity, the second pressurizing cavity and the water passage communicated with the second water passing cavity are respectively provided with the first water stopping component and the second water stopping component of a force lock type, and the first water stopping component and the second water stopping component block the water passage at the first water sealing sleeve ring and the second water sealing sleeve ring through forces.

Further, first stagnant water subassembly includes first diaphragm, first spring, and second stagnant water subassembly includes second diaphragm, second spring, and first diaphragm middle part is equipped with the first water conservancy diversion hole that switches on with first water passing chamber, and second diaphragm middle part is equipped with the second water conservancy diversion hole that switches on with the second water passing chamber, and first diaphragm right-hand member and second diaphragm left end integrated into one piece, first diaphragm, second diaphragm circumference compress tightly fixedly through the internal clamp plate of pump head, and first spring one end acts on the clamp plate, and the other end effect is with first diaphragm, and second spring one end acts on clamp plate, the other end acts on the second diaphragm.

Further, a first water passing cavity and a second water passing cavity are respectively formed between the bottom surface of the pressing plate and the first diaphragm as well as between the bottom surface of the pressing plate and the second diaphragm, and a water outlet cavity is formed between the top surface of the pressing plate and the inner wall of the pump head body.

Further, the top surface of the pressing plate is provided with a first water passing hole and a second water passing hole which are communicated with the first water passing cavity and the second water passing cavity respectively.

Further, the portions of the first diaphragm located at two sides of the first diversion hole are arched, and the portions of the second diaphragm located at two sides of the second diversion hole are arched.

Further, baffle, medium plate, backup pad are equipped with in proper order to the clamp plate below, and the clamp plate circumference compresses tightly between pump head body and baffle, and baffle circumference compresses tightly with between pump head body and the medium plate, and the medium plate circumference compresses tightly between baffle and backup pad, and the backup pad lower extreme is connected with the motor.

Further, a first water inlet hole and a first water outlet hole which are communicated with the first pressurizing cavity, and a second water inlet hole and a second water outlet hole which are communicated with the second pressurizing cavity are arranged on the partition plate, the first water inlet hole and the second water inlet hole are communicated with the water inlet cavity, and the first water inlet unidirectional diaphragm and the second water inlet unidirectional diaphragm are fixed on the partition plate and respectively cover the first water inlet hole and the second water inlet hole.

Further, a first pressurizing diaphragm and a second pressurizing diaphragm are pressed between the partition plate and the middle plate, two ends of the second pressurizing diaphragm, which are opposite to the second pressurizing diaphragm, are integrally formed, and a first pressurizing cavity and a second pressurizing cavity are respectively formed between the first pressurizing diaphragm, the second pressurizing diaphragm and the partition plate.

Further, the first pressure boost diaphragm, second pressure boost diaphragm bottom surface all are equipped with decurrent extension, and two extension are connected with and push away the frame, push away a middle part and be equipped with the connecting rod, and the connecting rod lower extreme eccentric connection has eccentric seat, eccentric seat and the output shaft eccentric connection of motor.

Further, the first sealing ring is embedded in the circumferential direction of the partition plate, and the second sealing ring is tightly pressed between the pump head body and the pressing plate.

The utility model has the beneficial effects that:

1. compared with the mode that the waterway is blocked by only one diaphragm in the prior art, the water sealing effect of the water sealing assembly is further improved by force, the waterway sealing performance between the pressurizing cavity and the water outlet cavity is improved, the phenomenon of dripping is not easy to occur under a pressurized water source, and the waste of the water source is reduced.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Reference numerals: 01-motor, 02-output shaft, 03-connecting rod, 04-eccentric seat, 05-pushing frame, 06-supporting plate, 07-first pressurizing diaphragm, 08-first pressurizing cavity, 09-middle plate, 10-first water outlet, 11-first water inlet, 12-first water inlet one-way diaphragm, 13-first sealing ring, 14-partition plate, 15-water inlet cavity, 16-second sealing ring, 17-pressing plate, 18-pump head, 19-water inlet, 20-water outlet, 21-first water outlet, 22-first spring, 23-second water outlet, 24-first water guide hole, 25-second water guide hole, 26-second water passing cavity, 27-second water inlet one-way diaphragm, 28-second water inlet, 29-second water outlet, 30-second pressurizing cavity, 31-second water sealing ring, 32-first water sealing ring, 33-water outlet cavity, 34-second pressurizing diaphragm, 35-first diaphragm, 36-first water passing cavity, 37-second diaphragm.

Detailed Description

The present utility model will be described in further detail with reference to examples and drawings, but embodiments of the present utility model are not limited thereto.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and for simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present utility model.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "configured," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Examples

The utility model provides a go out one-way diaphragm pump of water, includes pump head body 18, is equipped with intake chamber 15, play water cavity 33, first booster chamber 08, second booster chamber 30 in the pump head body 18, intake chamber 15, go out water cavity 33 respectively with water inlet 19, delivery port 20 switch-on, between intake chamber 15 and first booster chamber 08, second booster chamber 30 respectively through first intake one-way diaphragm 12, second intake one-way diaphragm 27 switch-on, still be equipped with in the pump head body 18 all with go out water cavity 33 switch-on first water cavity 36, second water cavity 26, the water route of first water cavity 36 and first booster chamber 08 switch-on constitutes and has first water-stop component of first water-sealing collar 32 of power lock type that control first water-sealing collar 32 department water route switch-on or block, the water route of second water cavity 26 and second booster chamber 30 switch-on is formed and has second water-sealing collar 31 and power lock type second water-stop component that control second water-sealing collar 31 department water route switch-on or block.

In this embodiment, as shown in fig. 1, source water enters the water inlet cavity 15 through the water inlet 19, and is sucked into the first pressurizing cavity 08 and the second pressurizing cavity 30 through the first water inlet unidirectional diaphragm 12 and the second water inlet unidirectional diaphragm 27 respectively, then the source water is pumped into the first water passing cavity 36 and the second water passing cavity 26 by the first pressurizing cavity 08 and the second pressurizing cavity 30 respectively, and then enters the water outlet cavity 33 and is finally output by the water outlet 20, so as to finish the water sucking and pumping processes of the diaphragm pump, and the water paths communicated with the first pressurizing cavity 08, the first water passing cavity 36, the second pressurizing cavity 30 and the second water passing cavity 26 are respectively provided with a first water stopping component and a second water stopping component of a force lock type, and the first water stopping component and the second water stopping component block the water paths at the first water sealing collar 32 and the second water sealing collar 31 by force.

Preferably, the first water stop assembly comprises a first diaphragm 35 and a first spring 22, the second water stop assembly comprises a second diaphragm 37 and a second spring, a first diversion hole 24 communicated with a first water passing cavity 36 is formed in the middle of the first diaphragm 35, a second diversion hole 25 communicated with a second water passing cavity 26 is formed in the middle of the second diaphragm 37, the right end of the first diaphragm 35 and the left end of the second diaphragm 37 are integrally formed, the first diaphragm 35 and the second diaphragm 37 are circumferentially pressed and fixed through a pressing plate 17 in the pump head body 18, one end of the first spring 22 acts on the pressing plate 17, the other end acts on the first diaphragm 35, one end of the second spring acts on the pressing plate 17, and the other end acts on the second diaphragm 37.

The specific working principle of the two water stop assemblies is as follows: the first diaphragm 35 and the second diaphragm 37 are integrally formed, the first diaphragm 35 and the second diaphragm 37 are tightly pressed through the pressing plate 17, the pressing plate 17 is E-shaped, two sides of the pressing plate 17 tightly press the first diaphragm 35 and the second diaphragm 37 in the circumferential direction, the middle part of the pressing plate 17 tightly presses the connecting parts of the two diaphragms, the middle part of the first diaphragm 35 and the middle part of the second diaphragm 37 are respectively provided with a through first diversion hole 24 and a through second diversion hole 25, the lower ends of the first spring 22 and the second spring respectively act on the first diaphragm 35 and the second diaphragm 37, the upper ends of the measuring springs act on the bottom surface of the pressing plate 17, the first diaphragm 35 and the second diaphragm 37 are respectively pressed downwards through the first spring 22 and the second spring, a downward force is given to the two diaphragms, the first diaphragm 35 and the second diaphragm 37 respectively seal the first diversion hole 32 and the second diversion hole 31, the generated water pressure overcomes the acting force of the first spring 22 and the second spring when the first pressurizing cavity 08 and the second pressurizing cavity 30 begin pumping water, the upper ends of the two springs are respectively, the first diaphragm 35 and the first diaphragm 32 and the second diaphragm 37 are separated from the first diversion hole 32 and the second diaphragm 37 and are separated from the second diaphragm 37, the second diaphragm 37 and enter the first pressurizing cavity 30 and the second pressurizing cavity 26, the second pressurizing cavity is separated from the second diaphragm 30, and enters the pressurizing cavity 30, and the pressurizing cavity is separated from the pressurizing cavity and the pressurizing cavity is separated from the second pressurizing cavity and enters the second pressurizing cavity and water cavity and the second diaphragm and has the pressurizing cavity and is separated into the pressurizing cavity and the second pressurizing cavity and has the second pressurizing diaphragm 37, and has the second pressurizing diaphragm and the second diaphragm 35. When the diaphragm pump does not pump water, the volume of the pressurizing cavity is unchanged, the first spring 22 and the second spring are compressed to generate downward reverse force to respectively prop against the first diaphragm 35 and the second diaphragm 37, so that the waterways of the first water sealing sleeve ring 32 and the second water sealing sleeve ring 31 are sealed, even if the water inlet 19 is a pressurized water source, the sealing performance of the first water sealing sleeve ring 32 and the second water sealing sleeve ring 31 is improved under the counter force action of the springs, the waterway sealing performance between the pressurizing cavity and the water outlet cavity 33 is improved, and even if the pressurized water source is not easy to drop, the waste of the water source is reduced.

Preferably, a first water passing cavity 36 and a second water passing cavity 26 are respectively formed between the bottom surface of the pressing plate 17 and the first diaphragm 35 and the second diaphragm 37, and a water outlet cavity 33 is formed between the top surface of the pressing plate 17 and the inner wall of the pump head body 18.

Preferably, the top surface of the pressing plate 17 is provided with a first water passing hole 21 and a second water passing hole 23 which are respectively communicated with the first water passing cavity 36 and the second water passing cavity 26. Specifically, the first water passing hole 21 corresponds to and is communicated with the first water passing cavity 36, the second water passing hole 23 corresponds to and is communicated with the second water passing cavity 26, the first water passing hole 21 is used for communicating the first water passing cavity 36 with the water outlet cavity 33, the second water passing hole 23 is used for communicating the second water passing cavity 26 with the water outlet cavity 33, and water in the first water passing cavity 36 and the second water passing cavity 26 can enter the water outlet cavity 33.

Preferably, the portions of the first diaphragm 35 located on both sides of the first diversion hole 24 are arched, and the portions of the second diaphragm 37 located on both sides of the second diversion hole 25 are arched. Specifically, the first diversion holes 24 are vertical through holes, the two sides of the first diversion holes 24 are of arch structures, and similarly, the first diversion holes 24 are vertical through holes, the two sides of the first diversion holes 24 are of arch structures, and the arch structures can enhance the capacity of the diaphragm for resisting the water pressure in the water passing cavity.

Preferably, a partition 14, a middle plate 09 and a support plate 06 are sequentially arranged below the pressing plate 17, the pressing plate 17 is circumferentially pressed between the pump head body 18 and the partition 14, the partition 14 is circumferentially pressed between the pump head body 18 and the middle plate 09, the middle plate 09 is circumferentially pressed between the partition 14 and the support plate 06, and the lower end of the support plate 06 is connected with a motor 01. Specifically, the platen 17 and the pump head 18 are in an adaptive clamping connection, the first diaphragm 35 and the second diaphragm 37 are mainly pressed between the platen 17 and the partition 14, and the support plate 06 is mainly used for supporting each component above.

Preferably, the partition 14 is provided with a first water inlet 11 and a first water outlet 10 connected to the first pressurizing cavity 08, and a second water inlet 28 and a second water outlet 29 connected to the second pressurizing cavity 30, the first water inlet 11 and the second water inlet 28 are connected to the water inlet cavity 15, and the first water inlet unidirectional diaphragm 12 and the second water inlet unidirectional diaphragm 27 are fixed on the partition 14 and cover the first water inlet 11 and the second water inlet 28 respectively. Specifically, the first water inlet hole 11 and the second water inlet hole 28 are both communicated with the water inlet cavity 15, when the volumes of the two pressurizing cavities become larger, the water pressure in the water inlet cavity 15 downwards pushes against the first water inlet unidirectional diaphragm 12 and the second water inlet unidirectional diaphragm 27, so that source water enters the first pressurizing cavity 08 and the second pressurizing cavity 30, when the volumes of the two pressurizing cavities become smaller, the water pressure overcomes the elasticity of the two springs, the first diaphragm 35 and the second diaphragm 37 are jacked upwards by water pressure, the waterways at the two water sealing rings are communicated, and the source water in the two pressurizing cavities enters the two water passing cavities through the two water outlet holes and the diversion holes respectively, so that the water pumping operation is completed.

Preferably, a first pressurizing diaphragm 07 and a second pressurizing diaphragm 34 are pressed between the partition plate 14 and the middle plate 09, two ends of the second pressurizing diaphragm 34 opposite to the second pressurizing diaphragm 34 are integrally formed, and a first pressurizing cavity 08 and a second pressurizing cavity 30 are respectively formed between the first pressurizing diaphragm 07, the second pressurizing diaphragm 34 and the partition plate 14.

Preferably, the bottom surfaces of the first pressurizing diaphragm 07 and the second pressurizing diaphragm 34 are respectively provided with a downward extension section, the two extension sections are connected with a pushing frame 05, a connecting rod 03 is arranged in the middle of the pushing frame 05, the lower end of the connecting rod 03 is eccentrically connected with an eccentric seat 04, and the eccentric seat 04 is eccentrically connected with an output shaft 02 of the motor 01. Specifically, the connecting rod 03, the pushing frame 05 and the eccentric seat 04 together form an eccentric assembly (the structure commonly used by the existing diaphragm pump belongs to the prior art), the eccentric seat 04 is driven to rotate by rotating the output shaft 02 of the motor 01, and the alternating change of the volumes of the two pressurizing cavities is realized by the connecting rod 03, so that the functions of water absorption and water pumping are realized.

Preferably, the first sealing ring 13 is circumferentially embedded in the partition 14, and the second sealing ring 16 is compressed between the pump head body 18 and the pressing plate 17. The baffle 14 is circumferentially provided with a groove, the groove is clamped with an adaptive first sealing ring 13, the first sealing ring 13 is tightly pressed between the inner wall of the pump head body 18 and the outer wall of the baffle 14, the first sealing ring 13 is used for sealing an installation gap between the pump head body 18 and the baffle 14, and water in the water inlet cavity 15 is prevented from leaking to the outside of the diaphragm pump; a groove is formed in the circumferential direction of the top surface of the pressing plate 17, a second sealing ring 16 is clamped in the groove, and the second sealing ring 16 is tightly pressed between the extending part on the inner wall of the pump head body 18 and the pressing plate 17 and is used for completely isolating a gap between the water inlet cavity 15 and the water outlet cavity 33.

The foregoing description of the preferred embodiment of the utility model is not intended to limit the utility model in any way, but rather to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. The utility model provides a go out one-way diaphragm pump of water, includes pump head body (18), is equipped with intake chamber (15), play water cavity (33), first pressurized cavity (08), second pressurized cavity (30) in pump head body (18), intake chamber (15), go out water cavity (33) respectively with water inlet (19), delivery port (20) switch-on, between intake chamber (15) and first pressurized cavity (08), second pressurized cavity (30) respectively through first intake one-way diaphragm (12), second intake one-way diaphragm (27) switch-on, characterized in that, still be equipped with in pump head body (18) first water cavity (36) that all switch-on with go out water cavity (33), second water cavity (26), the water route that first water cavity (36) and first pressurized cavity (08) switch-on constitutes and has first sealing water jacket ring (32) and the power lock type first sealing water component that control first sealing water ring (32) water route switch-on or blocking, the water route that second water cavity (26) and second pressurized cavity (30) switch-on has second sealing water ring (31) and control second sealing water ring (31) switch-on water channel locking type sealing water component.

2. The unidirectional water outlet diaphragm pump according to claim 1, wherein the first water stop assembly comprises a first diaphragm (35) and a first spring (22), the second water stop assembly comprises a second diaphragm (37) and a second spring, a first diversion hole (24) communicated with the first water passing cavity (36) is formed in the middle of the first diaphragm (35), a second diversion hole (25) communicated with the second water passing cavity (26) is formed in the middle of the second diaphragm (37), the right end of the first diaphragm (35) and the left end of the second diaphragm (37) are integrally formed, the first diaphragm (35) and the second diaphragm (37) are circumferentially pressed and fixed through a pressing plate (17) in the pump head body (18), one end of the first spring (22) acts on the pressing plate (17), the other end acts on the first diaphragm (35), one end of the second spring acts on the pressing plate (17), and the other end acts on the second diaphragm (37).

3. A unidirectional diaphragm pump for water outlet according to claim 2, wherein a first water passing cavity (36) and a second water passing cavity (26) are respectively formed between the bottom surface of the pressing plate (17) and the first diaphragm (35) and the second diaphragm (37), and a water outlet cavity (33) is formed between the top surface of the pressing plate (17) and the inner wall of the pump head body (18).

4. A unidirectional diaphragm pump as claimed in claim 3, wherein the top surface of the pressure plate (17) is provided with a first water passing hole (21) and a second water passing hole (23) which are respectively communicated with the first water passing cavity (36) and the second water passing cavity (26).

5. A unidirectional diaphragm pump as claimed in claim 2, wherein the first diaphragm (35) has an arch shape at the two sides of the first flow guiding hole (24), and the second diaphragm (37) has an arch shape at the two sides of the second flow guiding hole (25).

6. The unidirectional diaphragm pump for water outlet according to claim 2, wherein a partition plate (14), a middle plate (09) and a support plate (06) are sequentially arranged below the pressure plate (17), the pressure plate (17) is circumferentially compressed between the pump head body (18) and the partition plate (14), the partition plate (14) is circumferentially compressed between the pump head body (18) and the middle plate (09), the middle plate (09) is circumferentially compressed between the partition plate (14) and the support plate (06), and a motor (01) is connected to the lower end of the support plate (06).

7. The unidirectional diaphragm pump as claimed in claim 6, wherein the partition plate (14) is provided with a first water inlet hole (11) communicated with the first pressurizing cavity (08), a first water outlet hole (10), a second water inlet hole (28) communicated with the second pressurizing cavity (30), and a second water outlet hole (29), the first water inlet hole (11) and the second water inlet hole (28) are communicated with the water inlet cavity (15), and the first unidirectional diaphragm (12) and the second unidirectional diaphragm (27) are fixed on the partition plate (14) and respectively cover the first water inlet hole (11) and the second water inlet hole (28).

8. The unidirectional water outlet diaphragm pump of claim 6, wherein a first pressurizing diaphragm (07) and a second pressurizing diaphragm (34) are pressed between the partition plate (14) and the middle plate (09), two opposite ends of the second pressurizing diaphragm (34) and the second pressurizing diaphragm (34) are integrally formed, and a first pressurizing cavity (08) and a second pressurizing cavity (30) are respectively formed between the first pressurizing diaphragm (07), the second pressurizing diaphragm (34) and the partition plate (14).

9. The unidirectional water outlet diaphragm pump of claim 8, wherein the bottom surfaces of the first pressurizing diaphragm (07) and the second pressurizing diaphragm (34) are respectively provided with a downward extension section, the two extension sections are connected with a pushing frame (05), a connecting rod (03) is arranged in the middle of the pushing frame (05), the lower end of the connecting rod (03) is eccentrically connected with an eccentric seat (04), and the eccentric seat (04) is eccentrically connected with an output shaft (02) of the motor (01).

10. A unidirectional diaphragm pump for water outlet as claimed in claim 6, wherein the partition plate (14) is circumferentially embedded with a first sealing ring (13), and a second sealing ring (16) is compressed between the pump head body (18) and the pressure plate (17).