WO2015014795A1

WO2015014795A1 - Solenoid valve and refrigeration machine which uses same

Info

Publication number: WO2015014795A1
Application number: PCT/EP2014/066179
Authority: WO
Inventors: Stefan BASSMANN; Raik HEYNE; Manuel SEITZ
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2013-08-02
Filing date: 2014-07-28
Publication date: 2015-02-05
Also published as: DE102013215262A1

Abstract

A solenoid valve has a valve seat (3) and a closing body (6) which can move between a closed position resting against the valve seat (3) and an open position at a distance from said valve seat (3), under the influence of a magnetic field. The closing body (6) is held in the open position by a flow of fluid through the valve seat (3).

Description

Solenoid valve and this using chiller

The present invention relates to a solenoid valve, in particular for use in a refrigerator of a household refrigerator, such as a freezer, a

Refrigerator etc.

Known solenoid valves, as described for example in DE20122909U1, generally have a housing with an internal chamber in which a closing body between a closed position, in which it seals on a valve seat, and an open position, in which it is spaced from the valve seat under the influence of an outside of the chamber arranged electromagnet is movable. The closing body is held in both positions by a permanent magnet; In order to move the closing body, the field of the electromagnet must be strong enough at both positions of the closing body to overcome the permanent magnet. The need to be able to generate a field of sufficient strength at spaced locations is necessary

Dimensions of the electromagnet in front. The weight of conventional solenoid valves is therefore usually so large that they can not be mounted alone on their associated piping in a device such as a household refrigerator, but need their own bracket on the housing of the device in which they are mounted and with the Pipelines are connected. Operating noise of the solenoid valve can be transmitted via such a holder on the housing and emitted from this as airborne sound.

The object of the invention is to provide a solenoid valve which can be kept compact and light in weight.

The object is achieved by holding in a solenoid valve with a valve seat and under the influence of a magnetic field between a voltage applied to the valve seat closing position and a valve seat spaced open position closing body of the closing body by a flow of fluid through the valve seat (3) in the open position is. Since no magnetic force has to be overcome for displacing the closing body from the open position, a small amount of force is sufficient Magnetic field in the region of the open position to relocate the closing body; accordingly, small and light can be a source of this magnetic field.

In particular, the valve seat between a permanent magnet and the

Be arranged closing body, so that the rest position defined by the permanent magnet is a closed position of the valve, is held firmly in the closing body on the valve seat and seals at this.

If the valve seat is not itself the permanent magnet, it is preferred

ferromagnetic, to act under the influence of the permanent magnet itself as a magnet and thus securely hold the closing body on the valve seat.

To ensure that the closing body, when it has been released from the valve seat, can reach it again, its freedom of movement may be expediently limited by a cage.

To simplify the assembly of the solenoid valve, the cage may be connected to the valve seat to a module.

The cage may be tapered towards the valve seat to close when closing the

Solenoid valve to guide the closing body to the valve seat.

As a source of the magnetic field that holds the closing body in the closed position on the valve seat, a coil can be arranged to save space around the valve seat around. To strengthen the field of the coil, the valve seat should be ferromagnetic.

Also, the permanent magnet can be arranged in the interior of the coil and serve as an iron core to increase the magnetic flux. Depending on the electrical polarity, the coil can be operated to the field of

Permanent magnets cancel and thereby releasing the closing body of the

To allow valve seat, or to strengthen the magnetic field of the permanent magnet and thus to pull the closing body on the valve seat. Valve seat and closing body can be accommodated in a tube. If this tube is integrally connected to an inflow or outflow line for the fluid to be controlled via the solenoid valve, the number of fluid-tight connections required when installing the valve in a device can be reduced. When using the valve in a refrigeration device can be used as a pipe directly a refrigerant pipe of a chiller.

Preferably, the valve seat is compressed in the tube. In general, the valve seat will be crimped in the pipe near a terminal end through which it was originally inserted into the pipe. Beyond the installation location of the valve seat, the pipe can extend as far as desired, in particular to another component of the cooling machine, such as an evaporator. Since the tube in this direction is one-piece and therefore free of weak points, which could be strained by a swinging movement of the solenoid valve, a

Attachment may be arranged at this pipe at a considerable distance from the solenoid valve. As a result, the entire length of the tube between attachment and solenoid valve is available to dampen vibrations caused by the movement of the closing body, before they can transfer to the body of a device in which the solenoid valve is installed. So can the emission of operating noise of the

Solenoid valve can be reduced.

In order to fix the closing body or the assembly in the pipe safely and positively, it is expedient that the valve seat facing a pipe

Peripheral surface has a recess into which during assembly of the solenoid valve part of the wall of the tube can be pressed.

To facilitate this pushing of the tube into the recess, it is expedient if the recess extends around the valve seat.

The valve seat may also carry a circumferential sealing ring to ensure that no refrigerant passes between it and the surrounding wall of the tube can and the refrigerant flow can be completely blocked by concern of the closing body on the valve seat.

The invention is also a chiller, in particular for

Domestic refrigerators, with at least one arranged in a refrigerant line solenoid valve as described above. The solenoid valve is preferably in the

Refrigerant line inserted, that the closing body is arranged downstream of the valve seat. Thus, the pressure of the refrigerant can drive the closing body from the valve seat, if it is not magnetically held on the valve seat. Further features and advantages of the invention will become apparent from the following

Description of embodiments with reference to the accompanying figures. Show it:

Fig. 1 is an exploded perspective view of parts of the

solenoid valve according to the invention;

2 shows an inventive solenoid valve in axial section. and

3 shows a block diagram of a solenoid valve according to FIG. 1 or FIG. 2

equipped chiller. Fig. 1 shows in an exploded view parts of a solenoid valve according to the present invention. The solenoid valve comprises a tube 1 of copper or other readily deformable diamagnetic material. Of the tube 1, only a short distance with a connection opening 2 is shown in FIG. 1, in practice the tube is many times longer than the components of the solenoid valve to be mounted in it, such as: a valve seat 3, a permanent magnet 4 , a cage 5 and a closing body 31 movable in the cage 5, here a ball 6.

The valve seat 3 is a substantially cylindrical body made of ferromagnetic material, in particular iron, through which a bore 7 extends axially. The

Bore 7 opens onto a conical sealing surface 8 at the tip of a protrusion 9 protruding from an end face of the valve seat 3. A circumferential groove 10 on the circumference of the valve seat 3 is provided in order to produce an elastomeric material shown in FIG. To receive sealing ring 1 1. Between this and a circumferential bead 12, a recess 13 extends around the valve seat third

The permanent magnet 4 is annular, with a through hole 14 which is aligned with the bore 7 of the valve seat 3. Means for fixing the permanent magnet 4 on the valve seat 3 are not provided, since both adhere magnetically firmly to one another.

The cage 5 has a base 15 having an opening formed to receive the projection 9 of the valve seat 3 and to be fixed to the projection 9 by crimping, soldering or the like. From the foot 15 go from several struts 16. The struts 16 extend substantially in the axial direction of the pipe 1 and are connected in one piece at their ends remote from the foot piece 15 by a cross 17. The distance between the struts 16 may be slightly larger than the diameter of the ball 6 so that it can be conveniently inserted into the cage 5 prior to insertion into the pipe 1. After attachment of the cage 5 in the

Pipe 1, the ball 6 no longer escape from the cage 5, since in the radial direction of the passage between the struts 16 is blocked by the tube 1 and in the axial direction of the free cross section between the arms of the cross 17 is not sufficient. Fig. 2 shows a finished assembled solenoid valve in an axial longitudinal section. To mount the valve as shown in the figure, first, the sealing ring 1 1 is placed in the groove 10 of the valve seat 3, and the valve seat 3 is connected to the cage 5 and the permanent magnet 4 to form an assembly. This module is inserted into the pipe 1 via the connection opening 2. Since the sealing ring bears against the wall of the tube 1 over its entire circumference, the assembly is provisionally fixed in the tube 1 by frictional engagement.

The assembly can be pushed ahead with both the permanent magnet 4 and, as shown in Fig. 2, with the cage 5 into which the tube 1. The latter orientation is preferred since, if no pressure has to be exerted on the cage 5 for insertion, this can be made light and thin-walled. Another advantage of this orientation is that when joining the tube 1 with a second tube 19, a tapered portion 20 of the latter when inserted into the tube 1 to a solid component of the assembly, here the permanent magnet 4, abut and the further insertion of the assembly can sieh herschieben ago. When the tapered portion 20 is completely inserted into the tube 1, so that a shoulder 21 of the tube 19 abuts the connection opening 2, the recess 13 is at a fixed, known distance from the connection opening 2. At this known distance from the connection opening 2, a pair of pliers can now be attached to the tube 1 in order to form the indentations 18 engaging in the recess 13 and to fix the assembly in the pipeline 1.

A coil 22 is prior to the mating of the tubes 1, 19 on the pipe first

postponed. The coil 22 is fixed in a position on the tube 1, in which it covers the indentations 18. Thus, it overlaps axially with the valve seat 3 and, in the case shown here, also with the permanent magnet 4, so that both of the coil 22 can serve as an iron core. This double function of valve seat 3 and permanent magnet 4 saves weight and space.

When the coil 22 is energized, it generates in the pipeline 1 an axially oriented magnetic field which, depending on the direction of the current, is parallel or antiparallel to the field of the permanent magnet 4. If the antiparallel field is the field of the

Compensated permanent magnet 4, the ball 6 is no longer exposed to magnetic attraction and can be pushed by pending in the pipe 19 refrigerant from its rest position on the valve seat 3. The open position of the solenoid valve achieved in this way can remain in the currentless state of the coil 22 even if the flow of the refrigerant is strong enough to keep the ball 6 away from the valve seat 3 and the field of permanent magnet 4 acting there.

If, however, the coil 22 is energized in the opposite direction, then strengthen their magnetic field and that of the permanent magnet 4 mutually, the ball is used to the valve seat 3 and closes it again. To close the valve quickly, the ball 6 should be as central to the

Sealing surface 8 hit. As can be seen in FIG. 2, this is facilitated by a shape of the cage 5 tapering towards the valve seat 3. Fig. 3 shows schematically a refrigerator, the solenoid valves 23 of the above

used type described. The chiller comprises in a customary manner a compressor 24, one connected to the pressure output of the compressor 24

Condenser 25 and two parallel to each other, connected to the outlet of the condenser via a branching refrigerant line 27 evaporator 26, the

different compartments, for example a normal fridge and a freezer, one

Cool combination refrigerator. The refrigerant line 27 comprises two tubes 19, which extend from the branch 29 to just before the solenoid valves 23. At points 30, the tubes 19 are plugged into tubes 1 and soldered, in which the assemblies of the valves 23 are inserted and extending in one piece continuously up to the evaporators 26.

The refrigerant line 27 is fixed at several points, for example by pipe clamps 28, on the housing of the refrigerator. The solenoid valves 23 are arranged in the two branches of the refrigerant pipe 27, each spaced from the pipe clamps 28, so that lying between the pipe clamps 28, the valves 23 receiving portions of the conduit 27 are oscillatable to some extent and thereby in a position to be able, when switching dampening of the valves 23 occurring vibrations before they reach the pipe clamps 28 and can stimulate the body to vibrate.

"

REFERENCE NUMBERS

1 tube

2 connection opening

3 valve seat

4 permanent magnet

5 cage

6 ball

7 hole

8 sealing surface

9 lead

10 groove

1 1 sealing ring

12 bead

13 recess

14 hole

15 foot piece

16 strut

17 cross

18 indentation

19 pipe

20 section

21 shoulder

22 coil

23 solenoid valve

24 compressors

25 liquefier

26 evaporator

27 Refrigerant line

28 pipe clamp

29 branching

30 place

31 closing body

Claims

1 . Solenoid valve with a valve seat (3) and one under the influence of a

Magnetic field between a valve seat (3) adjacent the closed position and a valve seat (3) spaced open position movable closing body (6), characterized in that the closing body (6) by a flow of fluid through the valve seat (3) is held in the open position ,

2. Solenoid valve according to claim 2, characterized in that the valve seat (3) between a permanent magnet (4) and the closing body (6) is arranged.

3. Solenoid valve according to claim 3, characterized in that the valve seat (3) is ferromagnetic.

4. Solenoid valve according to claim 1, 2 or 3, characterized in that a cage (5) in which the closing body (6) is movable, with the valve seat (3) is connected to an assembly.

5. Solenoid valve according to claim 5, characterized in that the cage (5) is tapered towards the valve seat (3).

6. Solenoid valve according to one of the preceding claims, characterized

characterized in that the valve seat (3) is ferromagnetic and a coil (22) is arranged around the valve seat (3).

7. Solenoid valve according to claim 6, as far as dependent on claim 2, characterized in that the permanent magnet (4) in the interior of the coil (22) is arranged.

8. Solenoid valve according to one of the preceding claims, characterized

in that the valve seat (3) and closing body (6) are accommodated in a tube (1). Solenoid valve according to claim 8, characterized in that the valve seat (3) in the tube (1) is pressed.

Solenoid valve according to claim 9, characterized in that the valve seat (3) on a pipe (1) facing peripheral surface has a recess (13) into which the tube (1) is pressed.

Solenoid valve according to claim 10, characterized in that the recess (13) extends around the valve seat (3).

Solenoid valve according to one of claims 8 to 11, as far as dependent on claim 6, characterized in that the coil (22) outside the tube (1) is arranged.

Solenoid valve according to one of the preceding claims, characterized

characterized in that the valve seat (3) carries a circumferential sealing ring (1 1).

Refrigerating machine, in particular for a household refrigerating appliance, with at least one solenoid valve (23) arranged in a refrigerant line (27) according to one of the preceding claims.

Refrigerator according to claim 14, characterized in that the

Closing body (6) downstream of the valve seat (3) is arranged.