JPH0511622Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention relates to a bimetallic temperature switch, which detects the temperature of the refrigerant discharged from a refrigerant compressor and turns on an electromagnetic clutch that transmits driving force to the refrigerant compressor. -It is effective when used as a temperature switch for turning off.

(Prior Art) An example in which a conventional bimetallic temperature switch is used in a refrigerant compressor is shown in FIGS. 3 and 4. In FIG. 3, reference numeral 103 denotes a housing of a refrigerant compressor, in which a discharge port 109 is formed for discharging compressed refrigerant compressed in a compression chamber. This housing 1
03, a discharge chamber housing 104 for forming a discharge chamber 110 is fixed with bolts 104a, and an insertion hole 104a for inserting and fixing the bimetallic temperature switch 100 is bored in this discharge chamber housing 104. It is set up.

A conventionally known bimetallic temperature switch 100 is installed in this insertion hole 104a.
An O-ring 105 is inserted and fixed between the inner wall of the bimetallic temperature switch 100 and the outer wall of the bimetallic temperature switch 100. The bimetallic temperature switch 100 is removed from the discharge chamber housing 10 in the direction of the discharge chamber 110.
4 and the stepped portion 10 provided on the case 108 of the bimetallic temperature switch 100.
8a and are prevented from coming off in the opposite direction by a circlip 106 placed on the top surface of the bimetallic temperature switch 100. In addition, the reference numeral 101 indicates a bimetal which undergoes reverse displacement due to temperature changes, and 102
b is a fixed contact, and 102a is a movable contact.

In the one shown in FIG. 4, a bimetallic temperature switch 100 is installed on the upper surface of a discharge chamber housing 104 by a stay 116. The temperature of the refrigerant in the discharge chamber 110 is determined by the discharge chamber housing 10.
Bimetallic temperature switch 100 through the wall of 4
is transmitted to the bimetal 101.

(Problem that the invention attempts to solve) However, if it is something like the one shown in Figure 3,
A fixing mechanism for the bimetallic temperature switch 100 that can withstand the high pressure within the discharge chamber 110 is required, and a high degree of sealing with the inner wall of the insertion hole 104a of the bimetallic temperature switch 100 must be maintained. There is a problem in that the structure becomes complicated and the cost increases accordingly.

In addition, in the case of the one shown in Fig. 4, the discharge chamber 1
Since the temperature of the refrigerant in the housing 10 is transmitted to one surface of the bimetal 101 via the wall of the discharge chamber housing 104, it takes time for the refrigerant temperature to be transmitted to the bimetal 101, resulting in a problem that responsiveness is not good.

The present invention attempts to solve the above problems.

(Means for solving the problem) Therefore, the following means were used in the present invention. That is, a protrusion projecting toward the discharge chamber is formed in the discharge chamber housing forming the discharge chamber, and a bimetal is disposed at the bottom of the inner wall space of the protrusion. Furthermore, a fixed contact and a movable contact that repeatedly comes into contact with and disengages from the fixed contact in response to the reverse displacement of the bimetal are disposed within the inner wall space. Further, the fixed contact and the movable contact are connected to a terminal arranged on a connector body, and the connector body is supported by a fixed plate fixed to the discharge chamber housing.

(Function) The temperature of the working fluid in the discharge chamber is transmitted through the protrusion wall and acts on the bimetal. In response to this temperature, the bimetal repeatedly undergoes reverse displacement, and upon receiving this reverse displacement, the movable contact contacts and disengages from the fixed contact.
A switching action is performed. The connector body is stably supported by a fixed plate fixed to the discharge chamber housing.

(Example) Next, an example will be described in which the present invention is used as a temperature switch for detecting the temperature of refrigerant discharged from a refrigerant compressor. FIG. 1 is a cross-sectional view showing this embodiment, and reference numeral 1 in the figure indicates a bolt 2 attached to the housing 21 of the compressor.
The discharge chamber housing is fixed by 1a. This discharge chamber housing 1 has a discharge chamber 30 inside.
This discharge chamber 30 forms a housing 2.
It communicates with the discharge hole 21b formed in 1. 22
A is a discharge valve that opens and closes the discharge hole 21b, and 22b is a valve holder that presses down the discharge valve 22a.

The discharge chamber housing 1 is formed with a protrusion 23 that protrudes toward the discharge chamber 30, and the protrusion 23 consists of a large diameter part 23a and a small diameter part 23b. An internal space is formed by the protrusion 23 on the side opposite to the protrusion chamber 30, and first, the bottom 23
c Bimetal 2 is placed on the top surface. The bimetal 2 is in a downwardly convex state in the figure when the temperature is below a predetermined temperature, and is reversely displaced to a convexly upward state in the figure when the temperature is above a predetermined temperature. This bimetal 2
A leaf spring 3 is disposed on the upper surface of the bimetal 2, and presses the bimetal 2 toward the bottom of the protrusion 23.
Further above the leaf spring 3, a holder 24 made of resin is housed. The outer circumferential wall of the holder 24 is formed along the inner circumferential wall of the protrusion 23, and the bimetal 2 and the leaf spring 3 are located between the bottom of the holder 24 and the bottom 23c of the protrusion 23. . A cylindrical shaft guide portion 24a is formed in the holder 24, and a cylindrical shaft 5 made of resin is slidably inserted into the shaft guide portion 24a. This shaft 5 is held by a leaf spring, one end of which secures a predetermined distance between it and the top surface of the bimetal 2, and the other end abuts against a support leaf spring 6 of a movable contact 14, which will be described later. ing.

A connector body 7 is disposed above the holder 24 via an O-ring 4. This connector body 7 is molded from resin, and a metal fixing plate 25 is integrally molded by insert molding. This fixing plate 25 is configured to be located on the upper surface of the discharge chamber housing 1, and is fixed to the discharge chamber housing 1 with bolts 8. Further, on the connector body 7, a first rivet 9 and a first terminal 11, and a second rivet 10 and a second terminal 12 are fixed to each other.
are each insert molded. This first
One end side of the rivet 9 and the second rivet 10 protrudes from the connector body 7 toward the space 20 formed inside the holder 24, and O-rings 18 and 19 are disposed on this protruding end. ,2
Sealing is performed between the rivets 9, 10 and the connector body 7. Furthermore, O-ring holding plates 26, 27 for holding down the O-rings 18, 19 are arranged at the projecting ends, and by opening the hollow projecting ends, the O-ring holding plates 26, 27 can be pressed. and O-rings 18, 19 are fixed. Also, when opening one end of the first rivet 9 and the second rivet 10, the first rivet 9
The movable contact support plate spring 6 is attached to the second rivet 10.
A fixed contact support plate 15 is fixedly fixed to each at the same time. Both the movable contact support spring 6 and the fixed contact support plate 15 are made of materials with excellent conductivity, and the movable contact 14 is attached to the tip of the movable contact support plate spring 6.
is fixed, and a fixed contact 13 is fixed to the tip of the fixed contact support plate 15. Movable contact 1
4 is located above the fixed contact 13 in the figure,
When the bimetal 2 is in a downward convex state, the fixed contact 13 is pushed by the biasing force of the movable contact support plate spring 6.
is under pressure. A projection 6a is formed in the center of the movable contact support plate spring 6, and the other end of the shaft 5 is in contact with this projection 6a.

FIG. 2 is a view of the above-mentioned temperature switch section viewed from above in FIG. From this figure, the fixing plate 25
It can be seen that it has a triangular shape. Further, the first terminal 11 is connected to a positive terminal of a battery 16, and the second terminal 12 is connected to an electromagnetic clutch 17 and then grounded.

Next, the operation of this embodiment will be explained.

When current is applied to the bimetallic temperature switch in the state shown in Figure 1, the magnetic clutch 17 turns on.
The refrigerant compressor rotates. There is no problem if the amount of refrigerant flowing through the refrigeration cycle is normal, but if the amount of refrigerant decreases due to leakage from the connections of each piping, etc., the refrigerant temperature in the discharge chamber 30 becomes abnormally high. Then, the temperature is transferred to the bimetal 2 through the bottom 23c of the discharge chamber housing 1, and when the temperature reaches the inversion temperature of the bimetal 2, the bimetal 2 changes from the downwardly convex state shown in the figure to the upwardly convex state. The displacement is reversed. This reverse displacement of the bimetal 2 pushes the shaft 5 upward in FIG. 1, and the movement of the shaft 5 also pushes the movable contact support leaf spring 6 upward. This results in
The movable contact 14 is spaced apart from the fixed contact 13, and includes the first terminal 11, the first rivet 9, the movable contact support plate fit 6, the fixed contact 13, the fixed contact support plate 15, the second rivet 10, and the second movable contact 14. The current flowing through the circuit connecting the terminal 12 is cut off, the magnetic clutch 17 is turned off, and the rotation of the refrigerant compressor is stopped. This also stops the temperature rise of the refrigerant and prevents damage to the compressor due to overheating.

Thereafter, when the refrigerant temperature in the discharge chamber 30 decreases to the return temperature of the bimetal 2, the bimetal 2 is displaced into a downwardly convex state as shown in FIG. 5 is pushed down in FIG. 1, and the movable contact 14 is the fixed contact 1.
Press contact with 3.

As a result, current begins to flow through the aforementioned circuit, and current is again applied to the magnetic clutch 17, causing the refrigerant compressor to resume rotation.

In this manner, when the amount of refrigerant decreases due to a refrigerant leak, etc., the magnetic clutch repeatedly turns on and off, during which time the user notices the abnormality and takes appropriate measures.

(Effect of the invention) As explained above, if the bimetallic temperature switch of this invention is used, the fixing plate is fixed to the discharge chamber housing and the connector body is supported by this fixing plate, so the connector can be stably connected. Can support the body.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of the embodiment, and FIGS. 3 and 4 are sectional views showing a conventional example. 1...Discharge chamber housing, 2...Bimetal,
5...Shaft, 7...Connector body, 11...
...Terminal 1, 12...Terminal 2, 1
3...Fixed contact, 14...Movable contact, 23...Protrusion, 25...Fixed plate.

Claims (1)

[Scope of utility model registration request] a discharge chamber housing fixed to a housing of the compressor; a discharge chamber formed inside the discharge chamber housing to which discharge fluid from the compressor is guided;
A protrusion formed by protruding the discharge chamber housing toward the discharge chamber, an internal space formed by the protrusion on a side opposite to the discharge chamber, and a bottom portion of the internal space. a shaft that is displaced in response to a reverse displacement of the bimetal; a fixed contact that is fixed within the internal space; and a movable contact that repeatedly comes into contact with and separates from the fixed contact in response to displacement of the shaft. , a connector body having a terminal connected to the fixed contact and the movable contact, and a fixed plate fixed to the discharge chamber housing and supporting the connector body, wherein the bimetal is transmitted through the protrusion wall. A bimetallic temperature switch whose displacement is reversed depending on the temperature of the working fluid in the discharge chamber.