Vacuum pumping device专利检索-低压差分信号信号处理专利检索查询-专利查询网

Vacuum pumping device

阅读：924发布：2023-01-15

专利汇可以提供Vacuum pumping device专利检索，专利查询，专利分析的服务。并且A power braking system having a vacuum operated pumping device for supplying fluid under pressure to operate a spring braking device. The pumping device has a housing with an internal cavity divided by a wall member. Vacuum is maintained on one side of the wall member while vacuum and atmospheric pressure are alternately communicated to the other side. This alternate communication will create a pressure differential across the wall member causing the wall member to reciprocate in the cavity. A cylinder having an inlet connected to a reservoir and an outlet operatively connected to the spring braking device contains a piston attached to the wall member. As the wall member reciprocates, the piston will pressurize the fluid transmitted to the outlet. A check valve located in the conduit leading from the outlet will prevent any backflow pressure while permitting the pumping device to raise the pressure in an accumulator to a predetermined value. When this predetermined pressure in the accumulator is equal to the force required to move the piston, alternate communication of vacuum and atmospheric pressure to the rear will automatically cease. An inversion valve has an inlet connected to the accumulator for communicating fluid under pressure through a control port to operate the spring brake device. Upon actuation of the inversion valve by an operator, fluid flow through the inlet is inhibited and the pressurized fluid allowed to escape to the reservoir to thereby permit the spring brakes to be applied. A pressure indicator located in the conduit between the check valve and the inversion valve will transmit a signal to an indicator to alert the operator if a low pressure condition is present in this braking system.，下面是Vacuum pumping device专利的具体信息内容。

权利要求

1. A power braking system having a fluid operated spring brake means for use as an emergency and parking brake in response to a manually positioned control valve directing fluid under pressure supplied by a differential pressure powered pumping means to control the operation of said spring brake means, said pumping means comprising: a housing having an internal cavity; wall means dividing said cavity into a front chamber and a rear chamber, said front chamber being operatively connected to a source of vacuum; a cylinder having an inlet port and an outlet pOrt, said inlet port being connected to a reservoir containing said fluid, said outlet port being connected by a conduit to said spring brake means; check valve means located adjacent said outlet port for preventing fluid under a backflow force from the spring brake means entering said cylinder; piston means located in said cylinder having a compensating port connected to said inlet port; push rods having at one end a compensating valve slidable in said piston for cooperation with said compensation port by means of a cross pin and slot, said cross pin also connecting said push rod to said piston for relative motion therebetween through a second slot in the piston, and the other end of said push rod being connected to said wall means; resilient means located in said front chamber for urging said wall means toward said rear chamber to open said compensating valve and permit fluid from the inlet port to enter said cylinder; control means having a second housing having a first inlet connected to said source of vacuum, a second inlet connected to the atmosphere, and an outlet connected to said rear chamber; control rod means axially aligned with and secured to said push rod means, said control rod means extending through said rear chamber into said second housing, said control rod having a small diameter section located thereon; spool means slidably carried on said small diameter portion of said control rod means; a pivot pin secured to said second housing; a first lever arm pivotally attached to said pin and connected to said spool means; a second lever arm pivotally attached to said pivot pin, said second lever arm having a groove which overlays said first inlet; and a spring attached to said first and second lever arms for moving said second lever arm in response to corresponding movement of said first lever arm as said spool means moves on said small diameter portion for alternately permitting communication of vacuum and atmospheric pressure to said rear chamber creating a pressure differential across said wall means causing said piston means to reciprocate in said cylinder and pressurize the fluid admitted from said inlet port by being forced through said outlet port, said piston means will continue to reciprocate until the force required to move said piston means against said backflow force present at said check valve is equal to the force created by the pressure differential across said wall means.

2. The power braking system, as recited in claim 1 wherein said second lever arm seals the first inlet port until the pressure differential across said wall means has moved the spool means a sufficient distance to position the spring on said first lever arm at a location on the opposite side of said pivot pin to cause said second lever arm to pivot on said pin, said spring urging said second lever arm into abutment with a stop where vacuum is communicated through said groove to said rear chamber.

3. The power braking system, as recited in claim 2 wherein vacuum is communicated to said rear chamber to eliminate the pressure differential across said wall means, said resilient means in the absence of a pressure differential across said wall means moving said movable wall means toward said rear chamber until said spring on the first lever arm has moved to a location on the opposite side of the pivot point a sufficient distance to cause said second lever arm to pivot on said pin, said pivotal movement by said second lever will open said outlet port and permit atmospheric pressure to said rear chamber.

4. The power braking system, as recited in claim 3 further including: means operatively connected to the conduit, located between said means for preventing backflow and said spring brake means, for transmitting a signal to an indicator device to alert an operator that a low fluid pressure exists in the system.

5. The power braking system, as recited in claim 4 further including: means operatively connected to the conduit, Located between said means for preventing backflow and said spring brake means, for storing a supply of fluid under pressure sufficient to permit a series of spring brake releases when vacuum for powering said pumping means is unavailable.

说明书全文

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Vacuum pumping device

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