JPS6240294Y2 - - Google Patents

Description

[Detailed Description of the Invention] The object of the present invention is to obtain stable valve operating characteristics in a thermoelectric expansion valve that controls the flow rate supplied in response to the temperature of electric heat.

Conventionally, thermoelectric expansion valves used as a control mechanism for refrigeration cycles can cause chattering depending on the setting conditions of the refrigeration cycle, which can induce pressure pulsations and damage the function of the refrigeration cycle. be.

FIG. 3 is a sectional view showing the configuration of a conventional example. 4
3 shows a thermally responsive plate equipped with a heater section 42;
This is adhered to the diaphragm 49 to constitute a thermally responsive mechanism, which is housed in a storage chamber 48 that is liquid-tightly formed by a frame 50 and a frame 51, and the valve 46 is tightly attached to the diaphragm 49. and are configured to operate in conjunction with each other in response to vertical displacement of the thermally responsive mechanism. The valve 46 is formed by integrally processing the valve stopper 45 and the valve stem portion 52. Further, the valve stem portion 52 and the constriction portion 53 of the frame body 51 are configured to narrow the gap and prevent the fluid in the secondary chamber 47 from flowing into the storage chamber 48 . Therefore, the refrigerant passes through the primary chamber 41 from the inlet portion 40, is ejected at the opening of the valve seat 44, and passes through a path leading to the outlet portion 54 of the secondary chamber 47.

The conventional problems will be explained with reference to FIG. Entrance section 40
The refrigerant that has flowed into the primary chamber 41 causes the thermally responsive plate 43 to bend due to the heater section 42 depending on the amount of electricity supplied.
The liquid is ejected from a narrow passage opening formed by the valve seat 44 and valve stopper 45, which are controlled according to the vertical displacement thereof. However, since the refrigerant pressure in the primary chamber 41 acts on the lower end surface of the valve 46 in the direction of valve movement, for example, if the inflowing refrigerant pressure fluctuates to a large extent, the valve stopper 45
acts in the closing direction, and the pressures in the secondary chamber 47 and the storage chamber 48 temporarily decrease. As a result, the force exerted by the pressure of the storage chamber 48 on the diaphragm 49 in the thermally responsive plate 43 decreases, and the pressure on the thermally responsive plate 43 side of one diaphragm 49 increases. Therefore, the difference in force exerted by the diaphragm 49 causes an increase in the bending force of the thermally responsive plate 43 and acts in the opening direction of the valve 46. As a result, the secondary chamber 47
However, as the pressure increases, the force acting on the diaphragm 49 becomes larger, so the thermally responsive plate 43 changes and acts in the direction of closing the valve 46, contrary to the previous step. In other words, repeated movements occur, resulting in a so-called chattering phenomenon. Furthermore, the refrigerant in the storage chamber 48 expands due to the heat of the heater, and the pressure within the storage chamber 48 increases, which may cause the valve 46 to act in the closing direction, reducing the function of the thermoelectric expansion valve.

The present invention solves these problems and provides a thermoelectric expansion valve with stable operating characteristics.

The embodiments of the present invention will be described in detail with reference to the accompanying drawings, FIGS. 1 and 2.

In FIG. 1, numeral 1 indicates a thermally responsive plate equipped with a heater section 2, which is further attached to a specially molded deformable diaphragm 3, and a thermally responsive mechanism that causes bending deformation in response to heat. is airtightly stored in a storage chamber 6 formed by a frame 4 and a frame 5, and the chambers before and after the thermally responsive plate 1 are pressure-balanced by communication holes 7a and 7b. It is made up of: Further, the valve 9 is brought into close contact with the diaphragm 3 by the pressure of the spring 8,
The valve 9 is configured to receive vertical displacement corresponding to the thermal strain of the thermally responsive plate 1 in conjunction with each other. The valve 9 is integrally formed with a valve stopper 10, a valve sliding part 11, and a valve stem part 12, and has a storage chamber 6, a secondary chamber 13,
A communication passage 15 communicating with each of the valve lower end chambers 14 is provided. Further, the maximum diameter of the valve stopper 10 and the outer diameter of the valve sliding portion 11 are made approximately equal, and the valve seat 1
The opening diameter of 5 is set slightly smaller than the outer diameter of the valve sliding portion 11. Further, the valve lower end chamber 14 allows the valve sliding part 11 and the frame sliding part 16 to slide,
In addition, the passage resistance of the gap between the sliding parts is set to be large so that the fluid inflow from the primary chamber 17 is almost completely blocked. In addition, the frame 4 is connected to the heater 2.
The structure is such that electricity is supplied through a high-voltage resistant terminal portion 18 fixed to and a current-carrying wire 19. The liquid refrigerant flows in from the inlet portion 20, is ejected from the valve seat 15 having a constricted passage, expands, vaporizes, and reaches the outlet portion 21. Next, the functions and effects will be explained with reference to FIG. First, since the outer diameter dimensions of the valve stopper 10 and the valve sliding portion 11 are set to be equal, the force exerted by the refrigerant pressure in the primary chamber 17 on the pressure receiving area in the valve movement direction is canceled out and becomes zero. . That is, the upward force acting on the valve 9 is the pressure applied to the maximum diameter surface of the valve stopper 10, and the downward force is the pressure applied to the diameter of the valve sliding part 16. If the maximum diameter and the diameter of the valve sliding portion 16 are made the same, the upward force and the downward force will be equal. Moreover, the pressure in the storage chamber 6 is controlled by the communication hole 7a,
7b balances the front and rear surfaces of the diaphragm 3. Therefore, even if the pressure inside the storage chamber 6 is about to change due to thermal expansion pressure caused by the heat of the heater section 2 or pressure fluctuations in the primary chamber 17 and secondary chamber 13, the communication holes 7a and 7b can immediately prevent the pressure from changing. The pressures applied before and after the diaphragm 3 are balanced and do not act on the thermoelectrically responsive plate 1. Furthermore, the pressures in the valve lower end chamber 14, the secondary chamber 13, and the storage chamber 6 are balanced by the communication passage 22 and maintained at approximately the same pressure state, so that the pressure in the valve lower end chamber 14 closes the valve. The force acting in the valve opening direction and the force in the valve opening direction in which the pressure in the secondary chamber 13 acts on the valve stopper 10 from the opening of the valve seat 15 cancel each other out, and the force acting on the valve in the valve movement direction becomes large. can be reduced to width.
Therefore, since no fluid pressure acts on the diaphragm 3 or the valve 9, the valve 9 of the present invention operates only in response to the deflection of the thermally responsive plate 1 due to the heat of the heater section 2, so it has stable operating characteristics. It has the effect of being able to obtain the following.

Further, as shown in FIG. 2, a valve 2 is integrally formed into a cylindrical shape with the valve stopper 10 and the valve sliding part 11 uniform.
3, there is no force exerted by the refrigerant pressure in the primary chamber 17 in the direction of valve movement, so stable dynamic characteristics can be maintained as in the embodiment of the present invention shown in FIG. It is something that can be obtained. Note that the numerals added in the configuration diagram shown in FIG. 2 and
Elements with matching reference numerals in FIG. 1 indicate the same elements as those shown in FIG. As is clear from the above description, the present invention adjusts the opening degree of a primary chamber having a refrigerant inlet, a secondary chamber having a secondary medium outlet, and an opening communicating the primary chamber and the secondary chamber. It is equipped with a valve, a thermally responsive mechanism for operating the valve, and a storage chamber containing the thermally responsive mechanism inside. The valve includes a valve stopper that closes the opening, and a valve stem that connects the valve stopper and the thermally responsive mechanism. and a valve sliding part provided at the lower end of the valve stopper to restrict movement in the left and right direction, the maximum diameter of the valve stopper and the diameter of the valve sliding part being approximately the same diameter, By providing a communication path inside the valve that communicates the primary chamber, secondary chamber, and storage chamber, there is no need for a temperature-sensing tube or capillary tube to detect temperature, and the mounting position of the valve is limited. Pressure pulsations in the refrigeration cycle are eliminated without impairing the effect of the thermoelectric expansion valve, and stable valve operating characteristics can be obtained. In addition, the storage chamber is divided into two layers by a heat-responsive plate and a diaphragm, and communicated through a communication hole, so the pressure in the primary and secondary chambers acts on the entire storage chamber, causing heat Even if the response plate is deformed or the pressure fluctuates in the primary and secondary chambers, the pressure applied to the front and back of the thermally responsive plate and diaphragm is balanced, and there is no effect on the thermally responsive plate, resulting in more stable valve operating characteristics. is obtained.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a thermoelectric expansion valve according to an embodiment of the present invention, Figure 2 is a sectional view showing another embodiment, and Figure 3 is a sectional view of a thermoelectric expansion valve according to an embodiment of the present invention.
The figure is a sectional view of a conventional thermoelectric expansion valve. DESCRIPTION OF SYMBOLS 1...Thermal response plate, 2...Heater part, 3...Diaphragm, 9...Valve, 10...Valve stopper, 11...
...Valve sliding part, 13...Secondary chamber, 14...Valve lower end chamber, 15...Valve seat, 16...Frame sliding part, 17...
...Primary chamber, 20...Entrance section, 21...Exit section, 2
2...Communication path, 23...Valve.

Claims (1)

[Scope of utility model registration request] A primary chamber having a refrigerant inlet portion, a secondary chamber having a secondary medium outlet portion, a valve for adjusting the opening degree of an opening communicating the primary chamber and the secondary chamber, and a thermal response for operating the valve. and a storage chamber containing the thermally responsive mechanism therein, the storage chamber being partitioned into two layers by a thermally responsive plate equipped with a heater section that generates heat when energized and a diaphragm, and provided in the thermally responsive plate. The valve includes a valve stopper that closes the opening, a valve stem that connects the valve stopper and the thermally responsive mechanism, and a valve stopper that is provided at the lower end of the valve stopper. and a valve sliding part that restricts movement in the left and right direction, and the maximum diameter of the valve stopper and the diameter of the valve sliding part are approximately the same diameter, and the primary chamber and the secondary chamber are provided inside the valve. A thermoelectric expansion valve with a communication path that communicates the chamber and storage chamber.