Energy-saving integrated type single-phase alternating current motor starting protector

Abstract

The invention discloses an energy-saving integrated type single-phase alternating current motor starting protector and belongs to the technical field of refrigeration compressors. The energy-saving integrated type single-phase alternating current motor starting protector comprises a shell, a single-phase alternating current motor starter, a single-phase alternating current motor protector and a shell cover. A positive temperature coefficient thermistor cavity and a single-phase alternating current motor protector cavity are formed inside a shell cavity in an enclosed mode. The single-phase alternating current motor starter comprises a positive temperature coefficient thermistor, a first pin and a second pin. The single-phase alternating current motor protector is arranged inside the single-phase alternating current motor protector cavity. The shell cover is matched with the shell and is provided with a grounding pin, a pin N and a pin L. The energy-saving integrated type single-phase alternating current motor starting protector is characterized in that the single-phase alternating current motor protector comprises a base, a fixing seta, double metal sheets, electric heating wires, a first protector pin, a second protector pin, a movable contact reed and an ejection rod. The energy-saving integrated type single-phase alternating current motor starting protector has the advantages of being reliable in positioning, capable of improving installation efficiency and guaranteeing overall heating effects of the double metal sheets, convenient to manufacture and assemble, remarkable in energy-saving effect, and capable of simplifying a mould structure used for manufacturing the shell, preventing electrical short circuits, preventing the shell from deforming and being damaged due to heating and guaranteeing the stability and reliability standards of the pins.

Description

technical field [0001] The invention belongs to the technical field of refrigeration compressors, and in particular relates to an energy-saving integrated single-phase AC motor starter protector. Background technique [0002] The energy-saving integrated single-phase AC motor starter protector mentioned above is essentially an energy-saving integrated single-phase AC motor starter and protector, which is a combination of a single-phase AC motor starter and a single-phase AC motor protector. The motor starting protection device for refrigeration compressors not only has the ability to start the single-phase AC motor, but also protects the single-phase AC motor and can also reflect excellent energy-saving effects. [0003] All technical information about single-phase AC motor starters can be seen in the published Chinese patent documents, such as CN2664280Y (motor starter with improved structure), CN2664281Y (motor starter), CN2664282Y (motor starter with improved structure) a...

AI Technical Summary

Problems solved by technology

[0006] As far as the overall structure of the above-mentioned single-phase AC motor protector of CN100581043C is concerned, there are also the following disadvantages: First, because only the pin cavity for the spring piece and the pin (the patent is called the first pin) is formed on the fixing seat, so When the spring piece and the pin are accommodated in the pin cavity, the positioning effect of the fixing seat on the spring piece and the pin is fragile, so once there is a loose displacement, it will affect the relationship between the moving contact on the spring piece and the static contact on the pin. The effect of electrical contact or disconnection between them; secondly, because the heating wire cavity formed on the fixing seat is only for accommodating the heating wire, it has no limit effect on the heating wire, and arching (that is, arching) will appear in the actual use process. (1) situation, which affects the effect of the bimetallic sheet in contact with it as a whole; thirdly, due to the need to be equipped with a cover and a connecting piece as a carrier of the spring sheet (paragraph 3 and paragraph 4 on page 7 of the text of the manual), the relative structure Complicated, causing trouble for manufacturing and assembly

[0007] In terms of the overall structure of the aforementioned single-phase AC motor starter of CN100581043C, there are still following shortcomings: one, although the both sides of the bottom of the positive temperature coefficient thermistor can be significantly reduced by contacting the top protrusion with the bottom of the positive temperature coefficient thermistor. The support area of ​​the device in the positive temperature coefficient thermistor cavity of the housing can significantly reduce the volume of the positive temperature coefficient thermistor, for example, the weight is reduced from 35-40g to 15-16g, but due to the positive temperature coefficient The side edges in the circumferential direction of the thermistor (the applicant defines it as the front and rear side edges) still need to be in contact with the front and rear walls of the positive temperature coefficient thermistor cavity in a large area, so it is not enough to reflect the ultimate energy-saving effect. The specific performance is that the volume of the positive temperature coefficient thermistor is still too large, and the weight is still too heavy

Theoretically speaking, forming a support wall on the front and rear cavity walls of the positive temperature coefficient thermistor cavity and forming a protrusion on the support wall can make up for the aforementioned deficiency and further reduce the volume of the positive temperature coefficient thermistor. The weight can be further reduced and the energy-saving effect can be reflected to the extreme degree, but repeated experiments by the applicant show that this idea is not advisable, because on the one hand, the aforementioned first and second pins and the positive temperature coefficient thermistor On the other hand, due to the excessive occupation of the space in the width direction of the positive temperature coefficient thermistor cavity, the installation of the starter is troublesome; secondly, because it is formed in the positive temperature coefficient thermistor cavity The structure of a pair of supporting walls at both ends of the device is relatively complicated, which leads to a relatively complicated mold for manufacturing the shell; third, since the top protrusion is formed on the supporting wall, the bottom of the positive temperature coefficient thermistor, that is, the bottom surface, is in contact with the The distance between the cavity bottom of the positive temperature coefficient thermistor cavity is the sum of the height of the support wall and the height of the top protrusion, so the situation of excessively raising the positive temperature coefficient thermistor causes the positive temperature coefficient thermal The positive temperature coefficient thermistor cavity protrudes from the upper part of the sensitive resistor, and the protruding part needs to be compensated by the raised cavity on the cover (the protruding part penetrates into the raised cavity), which increases the complexity of the cover on the one hand On the other hand, the contact area between the positive temperature coefficient thermistor and the raised cavity is increased, and on the other hand, in order to ensure that the first and second pins are in the center position corresponding to the two sides of the positive temperature coefficient thermistor, the The positive temperature coefficient thermistor is reliably held and the position of the first and second pins must be moved upwards so that the support point between the first and second pins and the cavity wall of the positive temperature coefficient thermistor cavity (with the support point of the cavity wall) The contact part) moves to the upper cavity of the positive temperature coefficient thermistor cavity, which will affect the installation stability of the entire starter. For example, the first and second pins are separated from the positive temperature coefficient thermistor cavity. Concerns, which in turn lead to failure of electrical contact between the first and second pins and the positive temperature coefficient thermistor

Of course, by increasing the size of the housing in the height direction and thereby deepening the depth of the PTC thermistor cavity, the PTC thermistor can be located in the PTC thermistor cavity as a whole and can make up for the aforementioned disadvantages. Factors, but such a design will significantly increase the volume of the housing, that is, the problem of losing sight of the other; Fourth, because the first pin is in contact with the first pin reed on one side of the positive temperature coefficient thermistor (the patent claims No. One spring piece) and the second pin reed (the patent is called the second spring piece) in which the second pin is in contact with the surface of the other side of the positive temperature coefficient thermistor are in a straight line with the positive temperature coefficient thermistor The surface of the positive temperature coefficient thermistor is in contact, that is, the first and second pin reeds are both horizontally parallel to each other and fully correspond to each other, so when the electric spark is generated, the positive temperature coefficient thermistor will produce many cracks, because the opposite sides are still covered. The corresponding first and second pin reeds are elastically supported, and the cracked (cracked) part of the elastically supported positive temperature coefficient thermistor continues to be clamped in the original position stably, while the remaining fragments are scattered , so the power continues to pass through the elastically supported remnants of the PTC thermistor, causing these remnants and their associated first and second prong reeds to melt into each other, followed by a certain The result is an electrical short circuit between the first and second pins, which in turn further aggravates the generation of abnormal heat, which is very likely to force further failures of the device, such as causing shell failure. Body softening deformation, etc.

[0008] As far as the above-mentioned shell cover of CN100581043C itself is concerned, there are the following shortcomings: First, it is necessary to form six baffles for blocking the pins (including grounding pins, N pins and L pins) on the shell cover and towards the side of the housing; pieces, four anti-movement limit stops to prevent pins from moving, and five supporting flanges for supporting pins (for details, please refer to paragraph 2 on page 5 to paragraph 1 on page 6 of the patent specification) , which not only significantly increases the complexity of the cover structure, but also affects the installation efficiency of the pins; secondly, because the structure of the cover itself is unreasonable, before assembling the cover with the shell, the pins (that is, the ground pin , N pins and L pins) for assembly, that is to say, first insert all the aforementioned pins into the corresponding pin slots (that is, pin holes) preset on the shell cover, and then fit the shell cover together with the pins with the shell, As a result, the assembly efficiency will be seriously affected, because the pre-installation of the pins on the shell will interfere with the fit of the shell and the shell, and the stability of the pins is difficult to guarantee, and there is a risk of deflection and loosening

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