WO2021214827A1

WO2021214827A1 - Compressor

Info

Publication number: WO2021214827A1
Application number: PCT/JP2020/017039
Authority: WO
Inventors: 貴文中野
Original assignee: 三菱電機株式会社
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2021-10-28
Also published as: JP7275385B2; JPWO2021214827A1

Abstract

This compressor comprises a plurality of temperature sensors that sense the temperature of a shell constituting an outer shell, and a sensor holder that attaches the temperature sensors to the shell. The sensor holder is composed of an elastic plate-form member and has a plurality of holding parts that individually hold the temperature sensors. Cutaway parts are formed between the holding parts. In a state in which the sensor holder has been attached to the shell, the temperature sensors are securely fixed to the shell by the holding parts. Due to this configuration, tilting of the sensor holder when the plurality of temperature sensors are attached is suppressed, and the temperature sensors can be securely fixed to the shell. Thus, an accurate shell temperature can be sensed by the plurality of temperature sensors, and temperature increase during abnormal operation of the compressor can be prevented.

Description

Compressor

This disclosure relates to a compressor provided in a refrigerant circuit.

A compressor provided in a refrigerant circuit such as an air conditioner or a refrigerator is provided with a temperature sensor in order to prevent the temperature of the compressor from rising during abnormal operation such as an overload state or a refrigerant leakage state of the refrigerant circuit. There is. For example, the compressor described in Patent Document 1 is provided with a temperature sensor of this type, a terminal, and a terminal protective cover that protects the terminal from dust, water, or the like on the outer surface of the shell of the compressor. There is.

In the compressor of Patent Document 1, a sensor holding portion in which a space portion having the same size as the external dimensions of the temperature sensor and an opening space for drawing out a sensor lead wire at one end of the space portion is formed. It extends from the terminal protective cover. Then, the temperature sensor is fitted into the space of the sensor holding part and temporarily fixed, and the terminal protective cover is put on the terminal and attached to the outer surface of the shell of the compressor. It is closely fixed. That is, in the compressor of Patent Document 1, the temperature sensor is closely fixed to the compressor by using a terminal protective cover that protects the temperature sensor from dust, water, or the like as a holder.

Japanese Unexamined Patent Publication No. 2002-188570

By the way, from the viewpoint of preventing the temperature rise of the compressor described above, the compressor provided in the refrigerant circuit can stop the operation by detecting the high temperature state of the compressor during abnormal operation and cutting off the power supply to the board. As such, it is desirable to additionally provide a temperature sensor.

However, even if a structure for simply fixing a plurality of temperature sensors is added to the terminal protective cover as in Patent Document 1, the terminal protective cover tilts in the mounted state, and each temperature sensor is attached to the compressor. There is a risk that it will not be sufficiently tightly fixed. As a result, even if a plurality of temperature sensors are attached using the terminal protective cover, accurate temperature detection cannot be performed during abnormal operation, and there is a possibility that the temperature rise of the compressor cannot be prevented.

The present disclosure is to solve the above problems, and an object of the present disclosure is to provide a compressor capable of detecting the accurate temperature of the shell by a plurality of temperature sensors and preventing a temperature rise during abnormal operation.

The compressor according to the present disclosure includes a shell constituting an outer shell, a plurality of temperature sensors for detecting the temperature of the shell, and a sensor holder for attaching each temperature sensor to the shell. It is made of an elastic plate-shaped member, has a plurality of holding portions for separately holding each of the temperature sensors, and a notch is formed between the holding portions, and each of the temperature sensors is said to have the same temperature sensor. The sensor holder is closely fixed to the shell by each of the holding portions in a state of being attached to the shell.

According to the compressor according to the present disclosure, since a notch is formed between each holding portion of the sensor holder, the temperature sensor can be independently operated without being influenced by the elastic fluctuation of each holding portion. It can be held. Therefore, the inclination of the sensor holder when a plurality of temperature sensors are attached can be suppressed, and each temperature sensor can be closely fixed to the shell. Therefore, the accurate temperature of the shell can be detected by a plurality of temperature sensors, and the temperature rise during abnormal operation of the compressor can be prevented.

It is a schematic diagram which shows the refrigerant circuit of the air conditioner provided with the compressor which concerns on Embodiment 1. FIG. It is a perspective view which shows the structure of the outdoor unit in the air conditioner of FIG. It is a perspective view which shows the compressor of FIG. FIG. 3 is an exploded perspective view showing the upper part of the compressor of FIG. 3 in an exploded manner. It is a top view which shows the upper part of the compressor of FIG. 3 seen from above. It is a perspective view which shows the sensor holder of FIG. It is a top view which shows the contact area with the terminal protection cover in the sensor holder of FIG. It is sectional drawing which shows the 1st sensor holding part in the sensor holding tool of FIG. 5 as seen from the AA field of view. FIG. 5 is a cross-sectional view showing a second sensor holding portion when the second temperature sensor is not inserted in the sensor holder of FIG. 5 as viewed from a BB field of view. FIG. 5 is a cross-sectional view showing a second sensor holding portion when the second temperature sensor is inserted in the sensor holder of FIG. 5 as viewed from the AA field of view.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. It should be noted that the forms of the components shown in the entire specification are merely examples and are not limited to these descriptions. That is, the present disclosure can be appropriately modified to the extent that it does not contradict the gist or idea of the invention that can be read from the claims and the entire specification. A compressor with such a change is also included in the technical concept of the present disclosure. Further, in each figure, those having the same reference numerals are the same or equivalent thereof, which are common in the whole text of the specification.

Embodiment 1.
<Configuration of air conditioner 1>
The air conditioner 1 provided with the compressor 10 according to the first embodiment of the present disclosure will be described with reference to FIG. FIG. 1 is a schematic view showing a refrigerant circuit 5 of an air conditioner 1 provided with a compressor 10 according to a first embodiment.

As shown in FIG. 1, the air conditioner 1 according to the first embodiment cools or heats the air in the room by transferring heat between the outside air and the air in the room via a refrigerant. It has an indoor unit 2 and an outdoor unit 3.

In the air conditioner 1, the indoor unit 2 and the outdoor unit 3 are connected via a refrigerant pipe 4 arranged inside, a refrigerant pipe 4a arranged outside, and a refrigerant pipe 4b, and a refrigerant circuit 5 circulates the refrigerant. Is configured. The refrigerant circuit 5 is provided with a compressor 10, a flow path switching device 11, an outdoor heat exchanger 12, an expansion valve 13, and an indoor heat exchanger 14, and these are connected via

refrigerant pipes

4, 4a and 4b. There is.

The outdoor unit 3 has a compressor 10, a flow path switching device 11, an outdoor heat exchanger 12, and an expansion valve 13. Further, the outdoor unit 3 includes a control unit 6. The compressor 10 compresses and discharges the sucked refrigerant. Here, the compressor 10 may be driven and controlled by an inverter. In this case, the operation frequency can be changed by the control unit 6 to change the capacity of the compressor 10. The capacity of the compressor 10 is the amount of refrigerant delivered per unit time. The flow path switching device 11 is, for example, a four-way valve, which switches the direction of the refrigerant flow path.

The air conditioner 1 can realize a heating operation or a cooling operation by switching the flow of the refrigerant by using the flow path switching device 11 based on the instruction from the control unit 6. The outdoor heat exchanger 12 exchanges heat between the refrigerant and the outdoor air. Further, the outdoor heat exchanger 12 is provided with an outdoor blower 15 for increasing the efficiency of heat exchange between the refrigerant and the outdoor air, facing the outdoor heat exchanger 12. Here, the outdoor blower 15 may be driven and controlled by an inverter. In this case, the outdoor blower 15 changes the operating frequency of the fan motor 16 which is the drive source by the inverter, and changes the rotation speed of the fan. The outdoor blower 15 may be, for example, a sirocco fan or a plug fan as long as the same effect can be obtained. Further, the outdoor blower 15 may be a pushing type or a pulling type.

Here, the outdoor heat exchanger 12 functions as an evaporator during the heating operation, and heats are exchanged between the low-pressure refrigerant flowing in from the refrigerant pipe 4b side and the outdoor air to evaporate the refrigerant and vaporize it. And let it flow out to the refrigerant pipe 4a side. Further, the outdoor heat exchanger 12 functions as a condenser during the cooling operation, and between the refrigerant compressed by the compressor 10 flowing from the refrigerant pipe 4a side via the flow path switching device 11 and the outdoor air. The refrigerant is condensed and liquefied at the above, and is discharged to the refrigerant pipe 4b side. Although the case where the outdoor air is used as the external fluid has been described here as an example, the external fluid is not limited to the gas containing the outdoor air, and may be a liquid containing water.

The expansion valve 13 is a throttle device that controls the flow rate of the refrigerant, and adjusts the pressure of the refrigerant by adjusting the flow rate of the refrigerant flowing through the refrigerant pipe 4 by changing the opening degree of the expansion valve 13. During the cooling operation, the expansion valve 13 expands the high-pressure liquid state refrigerant into the low-pressure gas-liquid two-phase state refrigerant to reduce the pressure. The expansion valve 13 may be an electronic expansion valve, a capillary tube, or the like as long as the same effect can be obtained. For example, when the expansion valve 13 is composed of an electronic expansion valve, the opening degree is adjusted based on the instruction of the control unit 6.

The indoor unit 2 includes an indoor heat exchanger 14 that exchanges heat between the refrigerant and the indoor air, and an indoor blower 17 that adjusts the flow of air that the indoor heat exchanger 14 exchanges heat with.

The indoor heat exchanger 14 functions as a condenser during the heating operation, exchanges heat between the refrigerant flowing in from the refrigerant pipe 4a side and the indoor air, condenses the refrigerant and liquefies it, and causes the refrigerant pipe 4b side. Leak to. Further, the indoor heat exchanger 14 functions as an evaporator during the cooling operation, and exchanges heat between the refrigerant brought into a low pressure state by the expansion valve 13 flowing in from the refrigerant pipe 4b side and the indoor air to exchange the refrigerant. Takes heat from the air and evaporates it to vaporize it, causing it to flow out to the refrigerant pipe 4a side. Although the case where the indoor air is used as the external fluid has been described here as an example, the external fluid is not limited to the gas containing the indoor air, and may be a liquid containing water.

The operating speed of the indoor blower 17 is determined by the user's settings. Here, it is preferable that the indoor blower 17 is driven and controlled by an inverter. In this case, the indoor blower 17 changes the operating frequency of the fan motor 18 by the inverter to change the rotation speed of the fan. The indoor blower 17 may be, for example, a sirocco fan or a plug fan as long as the same effect can be obtained. Further, the indoor blower 17 may be a pushing type or a pulling type.

<Operation example of cooling and heating operation of air conditioner 1>
Next, the operation of the cooling operation will be described as an operation example of the air conditioner 1. The high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 10 flows into the outdoor heat exchanger 12 via the flow path switching device 11. The gas refrigerant that has flowed into the outdoor heat exchanger 12 is condensed by heat exchange with the outside air blown by the outdoor blower 15, becomes a low-temperature refrigerant, and flows out of the outdoor heat exchanger 12. The refrigerant flowing out of the outdoor heat exchanger 12 is expanded and depressurized by the expansion valve 13 to become a low-temperature low-pressure gas-liquid two-phase refrigerant. This gas-liquid two-phase refrigerant flows into the indoor heat exchanger 14 of the indoor unit 2, evaporates by heat exchange with the indoor air blown by the indoor blower 17, becomes a low-temperature low-pressure gas refrigerant, and becomes an indoor heat exchanger. Outflow from 14. At this time, the indoor air that has been cooled by being absorbed by the refrigerant becomes air-conditioned air (blown air) and is blown out from the indoor unit 2 into the room that is the air-conditioned space. The gas refrigerant flowing out of the indoor heat exchanger 14 is sucked into the compressor 10 via the flow path switching device 11 and is compressed again. In the cooling operation of the air conditioner 1, the operation beyond that indicated by the solid arrow in FIG. 1 is repeated.

Next, the operation of the heating operation will be described as an operation example of the air conditioner 1. The high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 10 flows into the indoor heat exchanger 14 of the indoor unit 2 via the flow path switching device 11. The gas refrigerant that has flowed into the indoor heat exchanger 14 is condensed by heat exchange with the indoor air blown by the indoor blower 17, becomes a low-temperature refrigerant, and flows out of the indoor heat exchanger 14. At this time, the indoor air that has been warmed by receiving heat from the gas refrigerant becomes conditioned air (blow-out air) and is blown out from the indoor unit 2 into the room. The refrigerant flowing out of the indoor heat exchanger 14 is expanded and depressurized by the expansion valve 13 to become a low-temperature low-pressure gas-liquid two-phase refrigerant. This gas-liquid two-phase refrigerant flows into the outdoor heat exchanger 12 of the outdoor unit 3, evaporates by heat exchange with the outside air blown by the outdoor blower 15, becomes a low-temperature low-pressure gas refrigerant, and becomes the outdoor heat exchanger 12. Outflow from. The gas refrigerant flowing out of the outdoor heat exchanger 12 is sucked into the compressor 10 via the flow path switching device 11 and is compressed again. In the heating operation of the air conditioner 1, the operation described by the broken line arrow in FIG. 1 is repeated.

<Structure of outdoor unit 3>
Here, the outdoor unit 3 of the air conditioner 1 according to the first embodiment will be described with reference to FIG. FIG. 2 is a perspective view showing the configuration of the outdoor unit 3 in the air conditioner 1 of FIG.

As shown in FIG. 2, the outdoor unit 3 covers a side panel 30a that covers one side surface, a front panel 30b that covers the front surface and the other side surface opposite to the side panel 30a, and a top surface as a housing that covers the outer shell. It includes a top panel 30c and a bottom plate 31 that covers the bottom surface. The housing is formed in a rectangular parallelepiped shape as a whole. The housing of the outdoor unit 3 may be arranged on the back side of the housing and may include a back panel (not shown) that covers the outdoor heat exchanger 12.

The inside of the housing of the outdoor unit 3 is divided into an air passage chamber 33 and a machine room 34 by a partition plate 32. An outdoor blower 15 is installed on the front side of the housing in the air passage chamber 33. Further, an outdoor heat exchanger 12 is installed on the back side of the outdoor blower 15 in the air passage chamber 33.

The outdoor blower 15 is provided with a plurality of blades 15a and is rotationally driven by a fan motor 16. Further, the front panel 30b located on the front side of the outdoor blower 15 in the housing of the outdoor unit 3 is provided with a slit-shaped air outlet 30ba for discharging the air inside the housing to the outside of the housing. Has been done. Although not shown in detail, the outdoor heat exchanger 12 has a structure including a heat transfer tube for flowing a refrigerant and fins for increasing the heat transfer area between the refrigerant flowing through the heat transfer tube and the outside air. ing.

In the machine room 34, a compressor 10 which is connected to the outdoor heat exchanger 12 via a refrigerant pipe 4 and supplies the refrigerant to the outdoor heat exchanger 12 is installed. Further, in the machine room 34, an electric component box 35 containing electric components such as a current sensor, a power module, and an inverter board for detecting the presence or absence of operation of the outdoor unit 3 is installed.

<Compression 10 configuration>
Next, the compressor 10 according to the first embodiment will be described with reference to FIGS. 3 to 10. FIG. 3 is a perspective view showing the compressor 10 of FIG. FIG. 4 is an exploded perspective view showing the upper part of the compressor 10 of FIG. 3 in an exploded manner. FIG. 5 is a top view showing the upper part of the compressor 10 of FIG. 3 as viewed from above. FIG. 6 is a perspective view showing the sensor holder 21 of FIG. FIG. 7 is a plan view showing a contact area of the sensor holder 21 of FIG. 6 with the terminal terminal cover 26. FIG. 8 is a cross-sectional view showing the first sensor holding portion 23a of the sensor holder 21 of FIG. 5 as viewed from the AA field of view. FIG. 9 is a cross-sectional view showing the second sensor holding portion 23b when the second temperature sensor 22b is not inserted in the sensor holder 21 of FIG. 5 as viewed from the BB field of view. FIG. 10 is a cross-sectional view showing the second sensor holding portion 23b when the second temperature sensor 22b is inserted in the sensor holder 21 of FIG. 5 as viewed from the AA field of view. In the following, for convenience, a plurality of terminal terminals will be collectively described as terminal terminals 20. Further, the first temperature sensor 22a and the second temperature sensor 22b as the plurality of temperature sensors may also be appropriately referred to as the

respective temperature sensors

22a and 22b.

As shown in FIGS. 3 to 5, the compressor 10 includes a plurality of terminal terminals 20, a covering body 24 arranged around the plurality of terminal terminals 20, and these terminals on the upper part of the shell 10a constituting the outer shell. It includes a terminal terminal cover 26 that protects the terminal 20. The terminal terminal cover 26 is fixed to the upper part of the shell 10a by the fixture 27 via the covering body 24.

Further, around the discharge port 10b above the shell 10a, a first temperature sensor 22a and a second temperature sensor 22b as a plurality of temperature sensors for detecting the temperature of the shell 10a, and a sensor for protecting the

respective temperature sensors

22a and 22b. A holder 21 and a holder 21 are provided. The sensor holder 21 has a first sensor holding portion 23a and a second sensor holding portion 23b as a plurality of holding portions for separately holding the plurality of

temperature sensors

22a and 22b. The sensor holder 21 is fastened together with the terminal terminal cover 26 by the fixture 27 via the covering body 24, and is fixed to the upper part of the shell 10a.

In the case of the first embodiment, the first temperature sensor 22a has a cylindrical shape with a circular cross section, and the second temperature sensor 22b has a rectangular parallelepiped shape with a non-circular cross section. The first temperature sensor 22a and the second temperature sensor 22b are arranged around the discharge port 10b in the high-pressure shell 10a filled with the high-pressure gas compressed by the compressor 10, and are the air conditioner shown in FIG. 1 described above. The temperature of the high temperature refrigerant discharged to the refrigerant circuit 5 of 1 is measured. That is, the first temperature sensor 22a and the second temperature sensor 22b are provided for the purpose of preventing the temperature rise of the compressor 10 due to the overload operation or the refrigerant leakage operation in the refrigerant circuit 5.

Although the case where the first temperature sensor 22a and the second temperature sensor 22b are provided as a plurality of temperature sensors is described here, the number of temperature sensors is not limited to two. Further, each of the

temperature sensors

22a and 22b may include a temperature sensor having a circular cross section and a temperature sensor having a non-circular cross section, and the first temperature sensor 22a has a cylindrical shape and the second temperature sensor 22b has a cylindrical shape. It is not limited to the rectangular parallelepiped shape.

In the case of the first embodiment, as shown in FIG. 6, the sensor holder 21 is composed of an elastic plate-shaped member, and has a first sensor-side elastic portion 21a and a second elastic portion 21a corresponding to the

respective temperature sensors

22a and 22b. A notch 21c is formed between the sensor-side elastic portion 21b and the sensor-side elastic portion 21b. In other words, the sensor holder 21 is partitioned between the first sensor-side elastic portion 21a and the second sensor-side elastic portion 21b via a notch 21c. Therefore, the elastic portion 21a on the first sensor side and the elastic portion 21b on the second sensor side can be used as independent elastic portions that are not affected by each other's movements.

As shown in FIG. 7, when the sensor holder 21 is fastened together with the terminal terminal cover 26, the sensor holder 21 is pressed and fixed by the cover bottom portion 26a. Therefore, by providing the notch portion 21c, it is divided into a first sensor side elastic portion 21a and a second sensor side elastic portion 21b with the cover bottom portion 26a as a fulcrum. That is, a notch 21c is formed between the first sensor holding portion 23a and the second sensor holding portion 23b.

As shown in FIGS. 6 and 8, the first sensor holding portion 23a is formed with a first sensor space portion 25a for temporarily fixing by inserting the first temperature sensor 22a into the elastic portion 21a on the first sensor side. Is composed of.

As shown in FIGS. 6, 9 and 10, the second sensor holding portion 23b is a second sensor space portion for temporarily fixing by inserting the second temperature sensor 22b into the elastic portion 21b on the second sensor side. 25b is formed and configured. In particular, in the case of the first embodiment, as shown in FIG. 9, the second sensor holding portion 23b is formed non-parallel to the installation surface of the shell 10a on which the second temperature sensor 22b is arranged. Specifically, when the second temperature sensor 22b is not inserted, the second sensor holding portion 23b is parallel to the installation surface of the shell 10a when the second temperature sensor 22b is inserted into the second sensor space portion 25b. Is formed non-parallel to the installation surface of the shell 10a.

As a result, as shown in FIG. 10, when the second temperature sensor 22b is inserted into the second sensor holding portion 23b, the second sensor holding portion 23b becomes parallel to the installation surface and the second temperature sensor 22b is tilted. Can be suppressed. Therefore, even if the second temperature sensor 22b has a non-cylindrical shape, it can be closely fixed to the shell 10a.

As described above, the first temperature sensor 22a and the second temperature sensor 22b are closely fixed to the shell 10a by the first sensor holding portion 23a and the second sensor holding portion 23b in a state where the sensor holder 21 is attached to the shell 10a. Will be done.

<Effect in Embodiment 1>
As described above, according to the compressor 10 of the first embodiment, the sensor holder 21 has a notch 21c formed between the first sensor holding portion 23a and the second sensor holding portion 23b. Then, the sensor holder 21 can independently hold the

temperature sensors

22a and 22b by the first sensor holding portion 23a and the second sensor holding portion 23b without being influenced by the elastic fluctuations of each other. That is, the sensor holder 21 includes an independent first sensor holding portion 23a and a second sensor holding portion 23b, and is fixed together with the terminal terminal cover 26 so that the

temperature sensors

22a and 22b can be installed easily. Can be improved. Therefore, the inclination of the sensor holder 21 when the first temperature sensor 22a and the second temperature sensor 22b are attached can be suppressed, and the

temperature sensors

22a and 22b can be closely fixed to the shell 10a, respectively. Therefore, the accurate temperature of the shell 10a can be detected by the

temperature sensors

22a and 22b, and the temperature rise during abnormal operation of the compressor 10 can be prevented.

1 air conditioner, 2 indoor unit, 3 outdoor unit, 30a side panel, 30b front panel, 30ba outlet, 30c top panel, 31 bottom plate, 32 partition plate, 33 air passage room, 34 machine room, 35 electrical parts, 4 Refrigerant piping, 4a refrigerant piping, 4b refrigerant piping, 5 refrigerant circuit, 6 control unit, 10 compressor, 10a shell, 10b discharge port, 11 flow path switching device, 12 outdoor heat exchanger, 13 expansion valve, 14 indoor heat exchange Vessel, 15 outdoor blower, 16 fan motor, 17 indoor blower, 18 fan motor, 20 terminal terminal, 21 sensor holder, 21a 1st sensor side elastic part, 21b 2nd sensor side elastic part, 21c notch, 22a 1st Temperature sensor, 22b 2nd temperature sensor, 23a 1st sensor holding part, 23b 2nd sensor holding part, 24 covering, 25a 1st sensor space part, 25b 2nd sensor space part, 26 terminal terminal cover, 26a cover bottom, 27 Fixture.

Claims

The shell that makes up the outer shell and
A plurality of temperature sensors that detect the temperature of the shell,
A sensor holder for attaching each temperature sensor to the shell is provided.
The sensor holder is
Consists of elastic plate-like members
It has a plurality of holding portions for holding each of the temperature sensors separately.
A notch is formed between the holding portions.
Each of the temperature sensors
A compressor in which the sensor holder is closely fixed to the shell by each of the holding portions in a state of being attached to the shell.
Each of the temperature sensors
The compressor according to claim 1, further comprising a temperature sensor having a circular cross section and a temperature sensor having a non-circular cross section.
The sensor holder is
The compression according to claim 2, wherein the holding portion of each of the holding portions corresponding to the temperature sensor having a non-circular cross section is formed non-parallel to the installation surface of the shell on which the temperature sensor is arranged. Machine.
Terminal terminals located on the shell and
Further provided with a terminal terminal cover that is attached to the shell and protects the terminal terminals.
The compressor according to any one of claims 1 to 3, wherein the sensor holder is fastened together with the terminal terminal cover to the shell.