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Solenoid valve for a coolant circuitSolenoid valve for a coolant circuit description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060207668, Solenoid valve for a coolant circuit. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATION [0001] This application is a continuation of U.S. application Ser. No. 10/460,441, filed Jun. 12, 2003, which claims priority to International Application No. PCT/EP01/14718, filed Dec. 13, 2001, which designated the United States and claims priority to German patent application No. 100 62 665.3, filed Dec. 15, 2000; the prior applications are herewith incorporated by reference in their entirety. FIELD OF THE INVENTION [0002] The present invention relates to a solenoid valve for a coolant circuit, with a valve body that has an inlet and at least one outlet for the coolant, and a valve member that can be displaced in the interior of the valve body between two positions that respectively correspond to the different switching positions of the solenoid valve. BACKGROUND OF THE INVENTION [0003] Such a solenoid valve is used to control the coolant flow in the coolant circuit or, in cases where the solenoid valve is designed as a directional path valve with several outlets, to switch a coolant flow to one or the other of at least two evaporators of the coolant circuit. [0004] A solenoid valve of the type described above is known from DE 37 18 94 A1. BRIEF SUMMARY OF THE INVENTION [0005] The object of the invention is to provide a solenoid valve of the type specified above that allows simpler, faster and therefore more economically-priced construction of a coolant circuit compared with solenoid valves known so far. [0006] The present invention includes at least one outlet of the solenoid valve according to the invention is formed by a capillary tube, the solenoid valve thus can at the same time fulfill the task of a pressure-relieving element for the coolant which is supplied at high pressure. This reduces the number of parts which must be joined together during the manufacture of a coolant circuit and the number of connection points between them. This results in savings in production time and costs without the need to accept cutbacks in the quality of the coolant circuit. On the contrary, the reduced number of joints reduces the risk of leakages in the coolant circuit. [0007] So that the capillary tube forming the outlet of the solenoid valve can also fulfill the task of a press-relieving element for the coolant under high pressure, it is desirable that the pressure drop between the beginning and end of the capillary tube is a multiple of the pressure drop between the inlet of the solenoid valve and the beginning of the capillary tube. In other words, the pressure drop at the valve seat of the solenoid valve is largely negligible compared with that in the capillary tube. [0008] The solenoid valve preferably has two outlets which are each formed by a capillary tube. Such a solenoid valve allows the selective operation of two connected evaporators, e.g. a cooling area and a freezing area of a combined refrigerating device. [0009] Each outlet is more appropriately arranged at a longitudinal end of a valve body and the inlet is arranged centrally on the valve body, and a coil is provided for generating a magnetic field in the longitudinal direction of the valve body. This allows the valve member to be simply controlled with the aid of a single magnetic field by means of linear forward and backward movement. [0010] In order to supply the magnetic field in the valve body, the valve body is preferably arranged outside the interior of the coil and the coil has two pole pieces in contact with the valve body. With such an arrangement it is also possible to repair or change the coil after the coolant circuit has been fully installed without the need to break the coolant circuit for this purpose. [0011] A further simplification of the structure of the coolant circuit and reduction in the number of parts is obtained if the inlet of the solenoid valve is formed by an outlet pipe section of a coolant drier joined to the valve body, which is usually provided in the coolant circuit of a refrigerating device. BRIEF DESCRIPTION OF THE DRAWING [0012] Further features and advantages of the invention are obtained from the following description of an embodiment with reference to the drawings, wherein: [0013] FIGS. 1 and 2 show two views of a valve body of a solenoid valve according to the invention; [0014] FIGS. 3 and 4 show two views of a housing of the solenoid valve according to the invention with the coil installed therein in the perspective respectively corresponding to those in FIGS. 1 or 2; [0015] FIG. 5 is a view of the solenoid valve after joining together in a perspective corresponding to that in FIG. 1 and FIG. 3; and [0016] FIG. 6 is a top view of the solenoid valve from FIG. 5. DETAILED DESCRIPTION OF THE INVENTION [0017] FIGS. 1 and 2 show the valve body 1 of a solenoid valve 100 according to the invention in two views from mutually perpendicular directions. The valve body 1 is shown in a partly cutaway view in FIG. 2 in order to explain its mode of operation better. A chamber 2 in the interior of the valve body 1 is bounded at two ends by valve seats 3 each having a central hole 102, 104 which forms the outlet 4 of the valve 100. A tube 106 of the valve body 1 is tapered towards its two ends 108, 110 and capillary tubes 5 are tightly soldered into the end openings 112, 114 of the valve body 1. The capillary tubes 5 are provided to be each connected to an evaporator of the coolant circuit (not illustrated), typically an evaporator assigned to the cooling area and an evaporator assigned to the freezing area of a combination refrigerating device (not illustrated). The length and diameter of the capillary tubes 5 on the one hand and the through cross-sections in the valve body 1 on the other hand are matched one to the other so that the pressure drop at a capillary tube 5 through which coolant flows is at least twice and preferably a multiple of the pressure drop in the valve body 1. [0018] An inlet pipe 6 coming from a drier 9, having a diameter larger than that of the capillary tube 5, is soldered onto an inlet 7 of the valve body 1, which opens centrally into the chamber 2. Continue reading about Solenoid valve for a coolant circuit... Full patent description for Solenoid valve for a coolant circuit Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Solenoid valve for a coolant circuit patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Solenoid valve for a coolant circuit or other areas of interest. ### Previous Patent Application: Fluid distribution device Next Patent Application: Faucet extension which makes it easier to reach the running water. 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