Metering pump
阅读说明:本技术 计量泵 (Metering pump ) 是由 M·洪堡 于 2019-08-21 设计创作,主要内容包括:本发明涉及一种计量泵、尤其是用于车辆加热器的燃料计量泵,其包括:电磁线圈驱动单元(12),其提供活塞/衔铁容纳空间(20),该活塞/衔铁容纳空间容纳用于沿运动轴线(B)的方向往复运动的活塞/衔铁组件(24)并且由电磁线圈驱动单元(12)的线圈装置(16)至少局部包围;进入阀(30),其设置在所述活塞/衔铁组件(24)中;泵室组件(47),其具有泵室壳体(46)和排出阀(58),该泵室壳体将活塞/衔铁组件(24)的活塞元件(26)在运动轴线(B)的方向上可移动地容纳在泵室(50)中;活塞/衔铁预紧元件(64),其沿第一移动方向预紧所述活塞/衔铁组件(24),以便使活塞元件(26)从泵室(50)中运动出来。(The invention relates to a metering pump, in particular a fuel metering pump for a vehicle heater, comprising: a solenoid drive unit (12) which provides a piston/armature receiving space (20) which receives a piston/armature assembly (24) for reciprocating movement in the direction of a movement axis (B) and which is at least partially surrounded by a coil arrangement (16) of the solenoid drive unit (12); an intake valve (30) disposed in the piston/armature assembly (24); a pump chamber assembly (47) having a pump chamber housing (46) which accommodates a piston element (26) of the piston/armature assembly (24) in the pump chamber (50) movably in the direction of the movement axis (B), and a discharge valve (58); a piston/armature biasing element (64) biasing the piston/armature assembly (24) in a first direction of travel to move the piston element (26) out of the pump chamber (50).)
1. Dosing pump, in particular fuel dosing pump for vehicle heaters, comprising:
-a solenoid drive unit (12), the solenoid drive unit (12) providing a piston/armature receiving space (20) which receives a piston/armature assembly (24) for reciprocating movement in the direction of a movement axis (B) and is at least partially surrounded by a coil arrangement (16) of the solenoid drive unit (12),
-an inlet valve (30) provided in the piston/armature assembly (24),
-a pump chamber assembly (47) having a pump chamber housing (46) which accommodates a piston element (26) of a piston/armature assembly (24) in the pump chamber (50) movably in the direction of the movement axis (B), and a discharge valve (58),
-a piston/armature pretension element (64) which pretensions the piston/armature assembly (24) in a first direction of movement in order to move the piston element (26) out of the pump chamber (50).
2. Metering pump according to claim 1, characterized in that the piston/armature assembly (24) comprises an armature element (28) which is connected to the piston element (26) for a common reciprocating movement.
3. Metering pump according to claim 2, characterized in that the inlet valve (30) comprises an inlet valve element (38) which is arranged in an inlet valve chamber (32) in the armature element (28) and is pretensioned against a valve seat (36) on the armature element (28) by an inlet valve pretensioning element (40) which is mounted on the piston element (26); an inflow opening (34) is formed in the armature element (28), said inflow opening being open upstream toward the piston/armature receiving space (20) and being able to be blocked by an inflow valve element (38).
4. Metering pump according to claim 3, characterized in that the inflow opening (34) opens in the direction of the axis of movement (B) in the direction of the piston/armature receiving space (20) or/and in that the inflow opening (34) opens in the region of the valve seat (36) in the direction of the inlet valve chamber (32).
5. Metering pump according to claim 3 or 4, characterized in that a through-flow passage (70) is provided in the piston element (26), which through-flow passage extends in the direction of the axis of movement (B) and opens out into the valve chamber (32) and into the pump chamber (50).
6. Metering pump according to one of claims 2 to 5, characterized in that the piston element (26) is arranged in the direction of the axis of movement (B) to engage into an armature element (28) and to be connected with the armature element (28) by a threaded engagement.
7. Metering pump according to claim 6, characterized in that the armature element (28) is connected to the piston element (26) by material locking, preferably by adhesive bonding.
8. Metering pump according to one of claims 2 to 7, characterized in that the armature element (28) is made of a ferromagnetic material, preferably iron.
9. Metering pump according to one of claims 2 to 8, characterized in that the piston/armature pretensioning element (64) is supported on an armature element (28) of the piston/armature assembly (24).
10. Metering pump according to one of the preceding claims, characterized in that the outlet valve (58) comprises an outlet valve element (56) which is arranged in an outlet valve chamber (54) in the pump chamber housing (46) and is pretensioned against a valve seat (59) on the pump chamber housing (46) by an outlet valve pretensioning element (60) which is mounted on an outlet connection (62); an outflow passage (52) is formed in the pump chamber housing (48), said outflow passage being open upstream toward the pump chamber (50) and being closable by a discharge valve element (56).
11. Dosing pump according to one of the preceding claims, characterized in that the pump chamber housing (46) or/and the piston element (26) is made of stainless steel.
12. Metering pump according to one of the preceding claims, characterized in that the solenoid drive unit (12) comprises a drive unit housing (14) which is made of plastic and provides a piston/armature receiving space (20).
Technical Field
The invention relates to a metering pump which can be used, for example, for supplying fuel to a combustion chamber in a vehicle heater operated with fuel.
Background
Such vehicle heaters, which can be operated as a parking heater or heater, use a mixture of fuel and combustion air in a combustion chamber for combustion in order to transfer the heat generated in the combustion chamber to the medium to be heated. In order to achieve combustion that is as free of harmful substances as possible, it is important that the fuel and the combustion air are fed into the combustion chamber in the amounts required for a defined ratio of fuel to be combusted and combustion air to be combusted.
Disclosure of Invention
The object of the present invention is to specify a metering pump, in particular a fuel metering pump for a vehicle heater, which ensures a metered, precise delivery of the medium to be delivered in a simple design.
According to the invention, the object is achieved by a metering pump, in particular a fuel metering pump for a vehicle heater, comprising:
a solenoid drive unit which provides a piston/armature receiving space which receives a piston/armature assembly for reciprocating movement in the direction of the movement axis and which is at least partially surrounded by a coil arrangement of the solenoid drive unit,
-an inlet valve provided in the piston/armature assembly,
a pump chamber assembly having a pump chamber housing which accommodates the piston element of the piston/armature assembly movably in the direction of the axis of movement in the pump chamber and a discharge valve,
a piston/armature biasing element biasing the piston/armature assembly in a first direction of movement to move the piston element out of the pump chamber.
With a metering pump of this design, a design which is simple to implement technically is achieved in which a precisely adjustable operating mode, in particular with regard to the operating frequency of the cyclical reciprocating movement of the piston/armature assembly, is achieved by using a solenoid drive unit and a piston/armature assembly which interacts magnetically therewith.
In order to ensure a defined interaction with the magnetic field generated by the solenoid drive unit, it is proposed that: the piston/armature assembly includes an armature member connected to the piston member for common reciprocation.
A compact design of the integration of the inlet valve in the piston/armature assembly can be achieved by: the inlet valve comprises an inlet valve element which is arranged in an inlet valve chamber in the armature element and is prestressed against a valve seat on the armature element by an inlet valve prestressing element which is mounted on the piston element; an inflow opening is formed in the armature element, which is open upstream toward the piston/armature receiving space and can be blocked by the inlet valve element.
For the purpose of supplying the medium to be supplied to the pump chamber, the inflow opening can open in the direction of the axis of movement in the direction of the piston/armature receiving space, or/and the inflow opening can open in the region of the valve seat in the direction of the inlet valve chamber. For this purpose, it can furthermore be provided that a flow passage which extends in the direction of the movement axis and is open toward the inlet valve chamber and the pump chamber is provided in the piston element.
In a particularly advantageous embodiment, it is provided that: the piston element is arranged in the direction of the movement axis to engage into the armature element and to be connected thereto by a screw thread engagement. In this way, it is possible to easily vary the engagement depth of the piston element into the armature element during the construction of the piston/armature assembly or to adapt it to the required displacement volume for the respective working stroke of such a metering pump.
Nevertheless, in order to avoid the armature element being separated from the piston element during operation of the pump, it is proposed: the armature element is connected to the piston element by a material bond, preferably by adhesive bonding.
For an effective magnetic interaction, the armature element can be made of a ferromagnetic material, preferably iron.
In order to ensure a defined reciprocating movement of the piston/armature assembly when the adaptation of the piston/armature assembly to the volume to be delivered of the medium to be delivered is provided by varying the engagement depth of the piston element into the armature element, it can be provided that the piston/armature pretensioning element is supported on the armature element of the piston/armature assembly.
In order to achieve a configuration that can be easily implemented in the construction of the outlet valve, it is proposed that: the discharge valve comprises a discharge valve element which is arranged in a discharge valve chamber in the pump chamber housing and which is pretensioned against a valve seat on the pump chamber housing by means of a discharge valve pretensioning element mounted on the discharge connection; and an outlet passage is formed in the pump chamber housing, which outlet passage is open upstream to the pump chamber and can be blocked by the outlet valve element.
In order to avoid that the volume to be delivered by the medium to be delivered in each working stroke changes due to wear of the pump chamber housing or/and the piston element, the pump chamber housing or/and the piston element can be made of stainless steel.
The simple and cost-effective design can preferably be assisted by the fact that the solenoid drive unit comprises a drive unit housing which is made of plastic and provides a piston/armature receiving space.
Drawings
The invention is explained in detail below with the aid of the figures. Wherein:
fig. 1 shows a longitudinal section through a metering pump;
fig. 2 shows an exploded view of the metering pump of fig. 1;
fig. 3 shows another detailed exploded view of the metering pump of fig. 1;
FIG. 4 shows the metering pump of FIG. 1 in a discharge stroke;
fig. 5 shows the metering pump of fig. 1 in a suction stroke.
Detailed Description
The metering pump is generally indicated at 10 in the various figures. The
The
A piston/
The piston/
An inlet valve, generally designated 30, which is designed as a non-return valve, is provided in the piston/
In order to lock the
The
In order to bias the piston/
The piston/armature pretensioning element is mounted on the one hand on the
When the coil arrangement is energized and the piston/
The delivery action of the
At the end of said movement of the piston/
The pressure of the medium to be conveyed present in the receiving
Thus, by means of the alternating reciprocating movement of the piston/
As already described above, it is possible to vary the depth to which the
A further advantage in the construction of the metering pump according to the invention is that preferably both the
Furthermore, the embodiment according to the invention provides a compact design, in particular in the axial direction, since the
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