Abstract: A viscous heater is provided with a front side plate 2 and a rear side plate 3, which are arranged so that a heat generating chamber 5 is formed between their facing back surfaces and which are stored in a housing so that heat emission chambers FW and RW are formed between the side plates and the housing. The housing is formed by a front housing having a tubular part 1c which extends axially for storing the front and side plates radially inwardly of the tubular part 1c and a rear housing 4. Thus, sealing is necessary only at a location where the front and rear housings 1 and 4 are connected with each other. Thus, a very simple structure is sufficient for preventing any leakage of the recirculated fluid.

Abstract: A reciprocating piston type compressor provided with pistons reciprocating in respective cylinder bores arranged in a cylinder block for compression of refrigerant gas in response to rotation of a reciprocation-drive-mechanism including a rotating drive shaft, a suction chamber receiving the refrigerant gas before compression and communicating with the cylinder bores via suction ports of a valve assembly, and a discharge chamber receiving the compressed refrigerant gas and communicating with the cylinder bores via discharge ports of the valve assembly, the discharge chamber being divided into a plurality of sub-chambers arranged to be in registration with the plurality of discharge ports of the valve assembly for attenuating pulsative components in the pressure of the compressed refrigerant gas, and the sub-chambers being sectioned by ribs having fluid passageways for providing communication among the sub-chambers.