JPH045820Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an improvement of an electric expansion valve used in a refrigeration cycle circuit.

[Technical background of the invention and its problems]

BACKGROUND ART Recently, refrigeration cycle circuits that constitute air conditioning circuits, refrigeration circuits, etc. have been developed that use electric expansion valves as pressure reducing mechanisms. This electric expansion valve has the advantage that the valve opening can be controlled using various signals.

This type of electric expansion valve is a single unit that has an electric part in the head of the valve body, and has a valve part inside, as well as a shutoff part that shuts off the valve part side and the above-mentioned electric part side. An integrally bonded structure is used.

By the way, in an electric expansion valve, a defect may occur in the electric part. This occurs particularly when it is incorporated into a refrigeration cycle circuit, that is, when it is used on the market.

However, with electric expansion valves in which the valve body and the electric part are integrally connected, in order to repair a defective electric part, the electric expansion valve itself attached to the refrigeration cycle circuit must be removed from the refrigeration cycle circuit. , When repairing, work such as brazing, vacuuming, and refrigerant filling is required, which has the drawback of requiring advanced technology and a large amount of cost.

[Purpose of invention]

This invention was made in view of the above-mentioned circumstances, and its purpose is to provide an electrically operated expansion valve that can be easily maintained in case of defects in the electrically operated part.

[Summary of the idea]

This invention includes a valve body configured by connecting a valve body and a motorized body in a divisible manner, and a valve body inserted into the motorized body so as to be movable toward the valve body. a driver, a motor provided on the electric part side main body to operate the driver forward and backward, a recess for diaphragm operation provided at an end of the valve side main body on the connection side opposite to the driver, and a recess for operating the diaphragm, and A diaphragm is attached to the opening edge so as to cover the opening of the recess without a gap, and a diaphragm is provided inside the valve side main body to be supported by a diaphragm portion corresponding to the driver and moves back and forth in accordance with the displacement of the diaphragm. a valve stem, which is also provided inside the valve side main body and whose opening degree is controlled by the forward and backward displacement of the valve stem, and a driver end of the motorized side main body and the valve side main body opposite thereto. A ball is provided between the diaphragm part at the valve stem position and transmits the forward and backward displacement of the driver to the valve stem to constitute an electric expansion valve. The purpose is to allow maintenance to be performed without requiring work such as refrigerant filling.

[Example of idea]

This invention will be explained below based on an embodiment shown in FIGS. 1 and 2. In FIG. 1, 1 is a variable capacity compressor, 2 is a four-way valve, 3 is a condenser, and 4 is an evaporator. These devices are sequentially connected through a refrigerant circulation path 5. Further, an electric expansion valve 6 is provided between the condenser 3 and the evaporator 4.
For example, refrigeration cycle circuit 7 capable of cooling and heating operation
It consists of The structure of this electric expansion valve 6 is shown in FIG. To explain the structure of this electric expansion valve 6, 8 in the figure is a valve body, and this valve body 8 is composed of two pieces: a valve side body 8a and a motorized side body 8b. The structure of the valve body 8a side is as follows.

That is, reference numeral 9 in the figure is a flow passage formed in the center of the valve-side main body 8a. This flow path 9 consists of two communication pipes 1 connected to the valve side main body 8a.
It is communicated with the refrigerant circulation path 6 via 0a and 10b. Further, a valve port 11 is provided in the center of the flow passage 9, and a valve rod 13 for opening and closing the valve port 11 is arranged in a partition wall portion 12 located directly above the valve port 11 so as to be able to move forward and backward. Part 14
It consists of Further, a circumferential wall 15 extending in the circumferential direction is integrally provided on the outer periphery of the upper surface of the valve side main body 8a, and a valve stem operating space 1 is provided in the central recess.
6 (corresponding to a recess for diaphragm operation). Then, the peripheral wall 15 is placed at the open end so as to cover the valve stem operation space 16 without a gap, and a shut-off part,
For example, a diaphragm 17 is attached, and the diaphragm 17 blocks off the valve part 14 side to prevent refrigerant from leaking from the valve part 14. and,
The base of the valve stem 13 is supported by this diaphragm 17, and the valve stem 13 is supported through the diaphragm 17.
By moving the valve port 3 forward and backward, the opening of the valve port 11 can be narrowed or expanded. Furthermore, a male thread 19 is carved on the outer surface of the peripheral wall 15.

On the other hand, as for the structure of the electric part side main body 8b, the lower surface part corresponds to the peripheral wall 15 of the above-mentioned valve part side main body 8b.
A recess 21 with a female thread 20 is formed on the inner surface. A driver 22 as a transmitting part is provided on the upper wall to move forward and backward while engaging a screw corresponding to the valve stem 13, and a motor 23 as an electric part is installed on the upper surface. Further, the driver 22, the motor 23, and the output shaft 23a are connected via a locking joint portion 24 so as to be movable forward and backward.

And, the electric part side main body 8 configured in this way
b is a peripheral wall 15 which is the head of the valve side main body 8a;
It is removably screwed onto the outer peripheral edge of the valve side main body 8a as a stopper via a male thread 19 and a female thread 20. Further, a ball 18 is interposed between the driver end of the motorized part side main body 8b and the diaphragm portion of the valve part side main body 8a opposite thereto at the valve stem position, and the driver 22 is connected to the valve stem 13 via the ball 18. ing. This allows driver 2
2 can be transmitted to the valve stem 13,
The opening degree of the valve port 11 can be controlled as required as the motor 23 is driven to rotate.

Therefore, the electric expansion valve 6 has a diaphragm 17 serving as a cutoff section that cuts off the valve section 14 side and the electric section side, and the valve section 14 including the diaphragm 17.
It can be divided into a side and a motor 23 side, and only the motor 23 side can be removed from the valve body 8.

Next, the effect will be explained.

By switching the four-way valve 2 to the cooling or heating side and operating the compressor 1, the condenser 3, electric expansion valve 6, and evaporator 4 can be looped, or the evaporator 4, electric expansion valve 6, and condenser A refrigeration cycle looping through 3 is formed to perform cooling and heating.

Then, when such an electric expansion valve 6 is installed in the refrigeration cycle circuit 7,
When a defect occurs in the motor 23 of the electric expansion valve 6 and repair is required, the screwing between the electric part side main body 8b and the valve side main body 8a is released, and the electric part side main body 8b is connected to the refrigeration cycle circuit 7. If it is removed from the side, only the motor 23 side can be removed from the refrigeration cycle circuit 7 while the diaphragm 17 blocks the external outflow of the refrigerant from the valve part 14 side.
Then, the maintenance is completed by attaching the repaired motor 23 or a new motor 23 to the valve section main body 8a through the electric motor section main body 8b.

Therefore, maintenance for defects in the motor 23 can be performed using advanced techniques such as brazing, evacuation, and refrigerant filling, and without requiring expensive work. Moreover, the structure in which the forward and backward displacement of the driver 22 is transmitted to the valve stem 13 using the ball 18 is such that the electric part side main body 8
The combination of b is easy.

In the above-described embodiment, a screw is used to divide the valve body, but there is no limitation to this, and any screw may be used as long as the valve body can be divided at the blocking portion.

[Effect of idea]

As explained above, according to this invention, only the electric part side main body can be changed without leaking refrigerant from the state where it is installed in the refrigeration cycle circuit.

Therefore, maintenance for defects in the motor-driven part can be easily performed without any need for sophisticated and costly operations such as brazing, vacuuming, and refrigerant filling. Moreover, the structure in which the forward and backward movement of the driver is transmitted to the valve stem using a ball allows easy connection of the main body on the electric part side.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, with FIG. 1 being a configuration diagram showing a refrigeration cycle circuit, and FIG. 2 being a sectional view showing an electric expansion valve. 6...Electric expansion valve, 8a...Valve side main body, 8
b...Electric part side main body, 8... Valve main body, 11... Valve port, 13... Valve stem, 14... Valve part, 16...
recess, 17... diaphragm, 18... ball,
23...Motor.

Claims (1)

[Scope of utility model registration request] A valve main body divided into a valve side main body and an electric motor side main body, a threaded portion provided in the valve main body and the electric motor side main body and connecting the two in a detachable manner by screwing, and a threaded portion in the electric motor side main body. a driver inserted into the body so as to be able to move forward and backward toward the valve side main body, a motor provided on the motorized side main body to operate the driver forward and backward, and a connecting side of the valve side main body facing the driver. a recess for diaphragm operation provided at the end; a diaphragm attached to the opening edge of the recess so as to cover the opening of the recess without a gap; and a diaphragm corresponding to the driver inside the valve side main body. a valve stem that is supported by the diaphragm and moves back and forth in accordance with the displacement of the diaphragm; a valve port that is also provided inside the valve body and whose opening degree is controlled by the movement of the valve stem; A ball is provided between the driver end of the part-side main body and a diaphragm portion at the valve stem position of the valve-side main body opposite thereto, and transmits forward and backward displacement of the driver to the valve stem. Electric expansion valve.