CN216562927U - Carbon dioxide pressure switch - Google Patents

Abstract

The utility model relates to a carbon dioxide pressure switch, which comprises a protective shell, wherein a switch shell, a gasket and a fixed ring are arranged in the protective shell; the switch shell and the gasket are matched together to form a first cavity, and a fixed contact, a movable contact, a push rod and a push rod guide seat are arranged in the first cavity; the cross-section of retainer plate is the U-shaped, and the retainer plate supports on the casing down, cooperate jointly between retainer plate and the packing ring and form the second cavity, install baffle, spring diaphragm, the stainless steel base that distributes from top to bottom in the second cavity. The utility model has the advantages that: through carrying out reasonable design again to the structure of protection casing inside, on the basis of guaranteeing normal use, change the shape and the mounted position of retainer plate, reduced the required part quantity that passes of push rod for the push rod is whole just can do short, and the structural strength of corresponding push rod has just also improved, has reduced the emergence of bad phenomena such as buckling, has guaranteed the smooth work of push rod.

Description

Carbon dioxide pressure switch

Technical Field

The utility model relates to a pressure switch, in particular to a carbon dioxide pressure switch.

Background

The pressure controller for a carbon dioxide refrigerant is a pressure controller for pressure protection of a refrigeration system using a carbon dioxide refrigerant.

At present, the refrigerant used in the refrigeration system is generally R22 or R410A, the environment protection requirement of the refrigerant is higher along with the stricter and stricter environment protection requirement, carbon dioxide is used more and more as the environment protection refrigerant, and the pressure and safety of the currently used pressure controller can not achieve the protection effect required by the carbon dioxide refrigerant. The main disadvantages are short service life and large pressure parameter drift.

Therefore, in order to solve the above-mentioned problems, patent CN203839279U discloses a waterproof pressure controller for carbon dioxide refrigerant, which comprises a copper tube, an upper cover, an electrical protection casing, a cover plate, a lead wire, and a terminal strip, the movable contact, the stationary contact and a left side, the inserted sheet of right side both sides, the lug, movable contact and stationary contact all are located electrical apparatus protective housing inner chamber, still include the limiting plate, the push rod, response diaphragm and indisputable retainer plate, the outside at the apron is installed to the limiting plate, the both ends centre gripping of response diaphragm is between limiting plate and upper cover and through indisputable retainer plate and limiting plate and upper cover fixed connection, the one end and the response diaphragm fixed connection of push rod, the other end supports the lug after passing the apron, the peripheral cover of electrical apparatus protective housing who is wrapped up by the retainer plate has protecting sheathing, electrical apparatus protective housing is located protecting sheathing, and all pack epoxy in protecting sheathing's top and side.

The pressure switch for carbon dioxide still has certain defects in the using process: for the push rod which is one of the main transmission parts, the push rod needs to pass through a plurality of components such as a limiting plate, a fixing ring and a cover plate, and the thicknesses of the fixing ring and the cover plate are thicker, so that the length of the whole push rod is longer, generally, the diameter of the pressure switch is smaller, based on the condition, the diameter of the push rod is smaller, namely, the whole push rod is of a slender structure, the push rod of the structure has not very high structural strength, and is easy to bend and the like, and the push rod is not 100% attached to the limiting plate, the fixing ring and the cover plate, so that a certain gap is inevitably reserved, so that when the length of the push rod is longer, the phenomenon that the push rod is deviated is easily caused, the matching of the push rod and a movable contact point is influenced, and further the phenomenon that a subsequent movable contact point and a static contact point are not good.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a carbon dioxide pressure switch capable of ensuring that a push rod works normally.

In order to solve the technical problems, the technical scheme of the utility model is as follows: the carbon dioxide pressure switch is characterized in that: comprises that

The protective shell comprises an upper shell and a lower shell which are distributed up and down, the upper shell and the lower shell are combined to form an installation cavity together, a switch shell, a gasket and a fixing ring are sequentially installed in the installation cavity from top to bottom, epoxy glue filler is filled in the installation cavity, and the bottom end of the lower shell is connected with a connecting rod;

the section of the switch shell is U-shaped, the switch shell and a gasket are matched together to form a first cavity, a stationary contact, a movable contact, a push rod and a push rod guide seat are installed in the first cavity, the push rod guide seat is supported on the gasket, a through hole which allows the push rod to pass through and move up and down is formed in the middle of the push rod guide seat, the stationary contact and the movable contact are arranged above the push rod guide seat and are installed on the switch shell respectively through independent wiring pieces, the upper ends of the wiring pieces extend out of the switch shell, and one sides of the wiring pieces extending out of the switch shell are also connected with a lead;

the section of retainer plate is the U-shaped, and the retainer plate supports on the casing down, cooperate jointly between retainer plate and the packing ring and form the second cavity, install baffle, spring diaphragm, the stainless steel base that distributes from top to bottom in the second cavity, it has the through-hole that holds the push rod and pass to open on the baffle, the bottom and the spring diaphragm contact of push rod to promote the movable contact and move from top to bottom under the promotion of spring diaphragm, thereby realize the closure or the separation with the stationary contact, the stainless steel base links to each other with the pole that connects through the switching mouth.

Furthermore, a sealing ring is arranged between the push rod guide seat and the gasket.

Further, the connecting rod is a threaded joint or a connecting pipe or a capillary connecting pipe.

The utility model has the advantages that: according to the pressure switch, the structure in the protective shell is reasonably designed again, on the basis of ensuring normal use, the shape and the mounting position of the fixing ring are changed, the number of parts through which the push rod needs to penetrate is reduced, the push rod can be shortened integrally, the structural strength of the corresponding push rod is improved, the occurrence of bad phenomena such as bending and the like is reduced, in addition, the moving path of the push rod is shortened, the phenomenon of deviation is reduced, and the smooth work of the push rod is ensured.

In addition, after the modified structure is adopted, the size of the shell can be changed, the temperature drift is reduced, the bursting strength is increased, and the service life is prolonged.

The sealing ring between the push rod guide seat and the gasket is a sealed shell, so that a gap is inevitably formed, external dust particles are prevented from entering the switch shell, the switch shell is sealed through the sealing ring, the phenomenon of poor contact or short circuit between a movable contact and a fixed contact due to the entering of the dust particles is avoided, and the sealing effect of the switch shell is improved.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic view of a first structure of a carbon dioxide pressure switch according to the present invention.

Fig. 2 is a schematic diagram of a second structure of the carbon dioxide pressure switch of the present invention.

Detailed Description

The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.

A carbon dioxide pressure switch as shown in FIG. 1 comprises

A protective shell, the protective shell includes an upper shell 12 and a lower shell 16 which are distributed up and down, the upper shell 12 is in an inverted U shape, the bottom end of the inner wall of the upper shell 12 is provided with an internal thread structure, the lower shell 16 is in a U shape, the outer wall of the lower shell 16 is provided with an external thread structure, the internal thread structure is matched with the external thread structure through threads, thereby realizing the thread fixation between the upper shell 12 and the lower shell 16, a fastening ring 10 is also arranged between the upper shell 12 and the lower shell 16, thereby ensuring the connection stability between the upper shell 12 and the lower shell 16, an installation cavity is formed jointly after the upper shell 12 and the lower shell 16 are combined, a switch shell 13, a gasket 7 and a fastening ring 4 are sequentially installed in the installation cavity from top to bottom, an epoxy glue filler 15 is also filled in the installation cavity, thereby the switch shell 13, the gasket 7 and the fastening ring 4 are all covered in the installation cavity, a connection rod 1 is also connected to the bottom end of the lower case 16. In the present embodiment, the extension rod 1 may adopt any one of a nipple, and a capillary nipple.

The cross section of the switch shell 13 is U-shaped, the switch shell 13 and the gasket 7 are matched together to form a first cavity, a fixed contact 17, a movable contact 18, a push rod 11 and a push rod guide seat 9 are installed in the first cavity, the push rod guide seat 9 is supported on the gasket 7, a sealing ring 8 is further arranged between the push rod guide seat 9 and the gasket 7, and the sealing ring 8 between the push rod guide seat 9 and the gasket 7 is because the switch shell 13 is not a closed shell. The first cavity is not a closed cavity, but is formed by matching the switch shell 13 and the gasket 7 together, so that a gap is inevitably formed, in order to prevent external dust particles from entering the switch shell 13, the sealing ring 8 is used for sealing the space between the switch shell 13 and the gasket 7, the phenomenon of poor contact or short circuit between the movable contact 18 and the fixed contact 17 caused by the entering of the dust particles is avoided, and the sealing effect of the switch shell 13 is improved.

A through hole which allows the push rod 11 to penetrate through and move up and down is formed in the middle of the push rod guide seat 9, a fixed contact 17 and a movable contact 18 are arranged above the push rod guide seat 9 and are respectively installed on the switch shell 13 through independent lugs, the upper end of each lug extends out of the switch shell, one side of each lug extending out of the switch shell 13 is also connected with a lead 14, in the structure shown in fig. 1, the fixed contact 17 is arranged below, the movable contact 18 is arranged above and is a normally-closed switch, and in the structure shown in fig. 2, the fixed contact is arranged above and the movable contact is arranged below and is a normally-open switch.

The cross-section of retainer plate 4 is the U-shaped form, retainer plate 4 supports on casing 16 down, cooperation forms the second cavity jointly between retainer plate 4 and the packing ring 7, install baffle 6 that distributes from top to bottom in the second cavity, spring diaphragm 5, stainless steel base 3, it has the through-hole that holds push rod 11 and pass to open on baffle 6, the bottom and the spring diaphragm 5 contact of push rod 11, and push movable contact 18 upper and lower action under the promotion of spring diaphragm 5, thereby realize with stationary contact 17's closure or separation, stainless steel base 3 links to each other with connecting rod 1 through switching mouth 2.

According to the pressure switch, the structure in the protective shell is reasonably designed again, on the basis of ensuring normal use, the shape and the mounting position of the fixing ring are changed, the number of parts through which the push rod needs to penetrate is reduced, the push rod can be shortened integrally, the structural strength of the corresponding push rod is improved, the occurrence of bad phenomena such as bending and the like is reduced, in addition, the moving path of the push rod is shortened, the phenomenon of deviation is reduced, and the smooth work of the push rod is ensured; in addition, after the modification structure is adopted, the size of the shell can be changed, the temperature drift is reduced, the bursting strength is increased, and the service life is prolonged.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (3)

1. A carbon dioxide pressure switch, characterized by: comprises that

The protective shell comprises an upper shell and a lower shell which are distributed up and down, the upper shell and the lower shell are combined to form an installation cavity together, a switch shell, a gasket and a fixing ring are sequentially installed in the installation cavity from top to bottom, epoxy glue filler is filled in the installation cavity, and the bottom end of the lower shell is connected with a connecting rod;

the section of the switch shell is U-shaped, the switch shell and a gasket are matched together to form a first cavity, a stationary contact, a movable contact, a push rod and a push rod guide seat are installed in the first cavity, the push rod guide seat is supported on the gasket, a through hole which allows the push rod to pass through and move up and down is formed in the middle of the push rod guide seat, the stationary contact and the movable contact are arranged above the push rod guide seat and are installed on the switch shell respectively through independent wiring pieces, the upper ends of the wiring pieces extend out of the switch shell, and one sides of the wiring pieces extending out of the switch shell are also connected with a lead;

the section of retainer plate is the U-shaped, and the retainer plate supports on the casing down, cooperate jointly between retainer plate and the packing ring and form the second cavity, install baffle, spring diaphragm, the stainless steel base that distributes from top to bottom in the second cavity, it has the through-hole that holds the push rod and pass to open on the baffle, the bottom and the spring diaphragm contact of push rod to promote the movable contact and move from top to bottom under the promotion of spring diaphragm, thereby realize the closure or the separation with the stationary contact, the stainless steel base links to each other with the pole that connects through the switching mouth.

2. The carbon dioxide pressure switch of claim 1, wherein: and a sealing ring is also arranged between the push rod guide seat and the gasket.

3. The carbon dioxide pressure switch of claim 1, wherein: the connecting rod is a threaded joint or a connecting pipe or a capillary connecting pipe.

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