摘要:
A swash plate type compressor for use in air conditioning systems operating with a refrigerant gas in which lubricating oil is previously mixed, comprises a plurality of cylinder bores and pistons, a swash plate chamber wherein a swash plate for reciprocating the pistons within the cylinder bores, is accomodated, a plurality of suction passages communicated with the swash plate chamber, suction chambers and exhaust chambers communicated with the cylinder bores, respectively and at least one sub-suction chamber communicated with the suction chambers through a shaft seal chamber wherein a shaft seal member is accomodated.At least one suction passage which is communicated with the swash plate chamber in the bottom portion thereof is communicated with the sub-suction chamber and the other suction passages are communicated with the suction chambers.The refrigerant gas and liquid oil stayed in the bottom portion of the swash plate chamber is flowed into the shaft seal chamber through the suction passage which is communicated with the bottom portion of the swash plate chamber, and subsuction chamber.The refrigerant gas and liquid oil lubricates and cools the shaft seal member accomodated within the shaft seal chamber and is atomized due to the operation of the shaft seal member.Then, the atomized refrigerant gas is flowed into each of the cylinder bores through the suction chambers.Therefore, the refrigerant gas is uniformly compressed within each of the cylinder bores without generating liquid compression.
摘要:
A swash-plate type compressor having a housing, a drive shaft rotatably supported by the housing, a swash-plate slantly secured on the drive shaft, and a plurality of pistons fitted in a cylinder bore formed in correspondence to each of the pistons parallelly to the drive shaft and provided with a pair of concave spherical surface formed therein. Each of the pistons is engaged with the swash-plate via a pair of shoes of substantially semi-spherical shape. The shoe has a convex spherical surface which is in sliding contact with the concave spherical surface of the piston and a flat-side surface which is in sliding contact with the swash-plate. The flat-side surface consists of a chamfered surface annularly formed on the outer portion thereof and a centrally left substantially flat surface with a diameter as large as about 60-90% of that of the whole flat-side surface. The substantially flat surface is formed into an extremely gentle convex surface with a height less than 15 .mu.m at the peak located in the center thereof. The whole surface of the shoe is covered by a solid lubricating film.
摘要:
A public parameter PK is key information used in a secret search system having: a transmission device generating and sending an encryption tag which is an encrypted keyword; a server receiving and storing the encryption tag and conducting a secret search in response to a request for the secret search; and a reception device generating a trapdoor which corresponds to a digital signature of the keyword and as well data requesting the secret search, sending the trapdoor to the server, and receiving a search result. The public parameter PK includes a true public parameter PP and a protection key PK′. The transmission device and the reception device require both the true public parameter PP and the protection key PK′; however, the server does not require the protection key PK′. The key generation device generates separately the true public parameter PP and the protection key PK′ included in the public parameter PK.
摘要:
A data search server stores a system ciphertext including a data ciphertext and a keyword ciphertext in each category-specific DB unit for each data category, and stores each category-determination secret key being associated with each category-specific DB unit. A search request receiving unit receives from a data search terminal a search request including a search trapdoor and an index tag. A data searching unit searches for a category-determination secret key with which the index tag is decrypted to the same value as a key-determination value. Using the search trapdoor, the data searching unit performs a search of a Public-key Encryption with Keyword Search scheme on system ciphertexts in a category-specific DB unit associated with this category-determination secret key. A search result transmitting unit transmits to the data search terminal a data ciphertext included in a system ciphertext which has been found as a hit in the search.
摘要:
A certification device 101 encrypts a feature vector for registration by using a random number and a public key which is set to correspond to a secret key in a decryption device 103. The encrypted feature vector for registration is registered in an authentication device 102. In authentication, the certification device encrypts a feature vector for authentication by using the public key and a random number. With the two encrypted feature vectors being kept encrypted, the authentication device generates encrypted similarity degree information from which the decryption device can derive the similarity degree between the two feature vectors by a decryption process using the secret key. The decryption device 103 decrypts the encrypted similarity degree information to derive the similarity degree of the plaintext. The authentication device 102, if the similarity degree is equal to or larger than a threshold, determines that the user is the correct user. The similarity degree can be derived without using the feature vector of the plaintext. Thus, secure identity authentication with a lower possibility of plaintext theft can be realized.
摘要:
Secret key backup is safely implemented even if a role base access structure in which the access structure is specified using roles is used. An all combination generating unit 107 obtains a backup participating user list 201 which is a list of backup participating users and a list of validated roles validated by the users, and a role base access structure 202 which is a combination of specified roles by which a secret key 205 can be restored, and generates an all combination extracted result which is all combinations of restoration enabling users of the secret key by applying users described in the backup participating user list 201 to the specified role. A same user/role deleting unit 108, etc. deletes a combination showing the same user redundantly, etc. from the all combination extracted result, a general access structure secret distributing unit 114 generates fragments of secret key from the secret key, and distributes the fragments of secret key to the combinations of users from which the redundancy is removed.
摘要:
An anti-rolling structure for a double headed piston of a disc cam type reciprocative compressor, comprising a cylinder block (1) through which a plurality of pairs of front and rear cylinder bores (4) are provided in parallel to a drive shaft (3) rotatably secured in the center of the cylinder block (1), and a double headed piston (8) slidably inserted in the respective pair of cylinder bores (4) for reciprocation in the longitudinal direction. A disc cam (13) having opposite sinuous surfaces (13') and rotatably accommodated within a cam chamber (5) is fixedly secured to the drive shaft (3), and a pair of front and rear cam rollers (14F, 14R) are arranged between the disc cam (13) and the piston (8) in a slidable and rotatable manner so as to nip the disc cam (13) between both cam rollers (14F, 14R) to transmit the rotation of the disc cam (13) to the piston (8) as a reciprocation in the longitudinal direction thereof. The front and rear cam rollers (14F, 14R) are positioned so that the axes of rotation thereof are not included in the center plane defined by longitudinal axes of the piston (8) and the disc cam (13) but disposed, respectively, in the opposite areas sectioned by the center plane with a substantially equal deviation from each other from the center plane. According to the above structure, the rolling motion of the piston (8) can be effectively restricted throughout the operation of the compressor.