JPH01303380A - Sliding valve - Google Patents

Abstract

PURPOSE:To magnifying the force of a solenoid coil so as to directly drive the title sliding valve, thus simplifying the structure thereof, by engaging a pin which is fittingly inserted on one end of a holder for holding the sliding valve, in a slot hole provided on an armature. CONSTITUTION:There is formed a valve seat 35 having an introducing hole 36a, and communicating holes 37a, 38a on a cylinder 33 having an introducing hole 34a. There is arranged a sliding valve 39 abutted on the valve seat 35. The sliding valve is holded by a holder 40. The pin 41 fittingly inserted in the holder 40 is engaged in a slot hole 42a formed on the armature 42. As current is applied on the solenoid 48, a plunger 42 is moved, thus impactly abutting the end part of the hole 42a on the pin 41 so as to magnify the drive force. Accordingly, the sliding valve is directly driven. The valve is not in a pilot valve type, so that the structure thereof is simplified and the reliability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a refrigeration cycle, particularly to a sliding valve used for switching between cooling and heating in a heat pump type air conditioner.

2. Description of the Related Art As a conventional technique, there is a switching valve for a refrigeration cycle as disclosed in Japanese Patent Publication No. 36-12689, for example.

The configuration of the conventional switching valve for a refrigeration cycle described above will be explained below based on the drawings.

FIG. 6 is a sectional view of a conventional switching valve for a refrigeration cycle. 1 is a compressor, and 2 is an accumulator, which are connected via a switching valve 3 to an annular circuit including an indoor heat exchanger 4, a capillary 6, and an outdoor heat exchanger 6. The switching valve 3 is composed of a switching valve main body 7 and a pilot valve device 8.

The switching valve main body 7 has two pistons 9 spaced apart from each other.
, 1o into three valve chambers 11, 12 and 13, and the two pistons 9, 1o are connected by a connecting rod 14 and simultaneously move left and right in FIG. 6. On the connecting rod 14 is a slide valve 1.
6 is attached, and this slide valve 16 moves in conjunction with the pistons 9 and 10.

There are four pipes 1 in the area sandwiched between the pistons 9 and 1o.
Inlet 16a by 6, 17, 18, 19.

An outlet port 17a, a first port 18a, and a second port 19a are formed.

The discharge pipe 16 of the compressor 1 is always in communication with the valve chamber 12 through the inlet 16a, and the outlet 1 of the suction pipe 1 of the compressor is connected to the valve chamber 12 through the inlet 16a.
7a is always in communication with a flow path 21 formed by the slide valve 16 and the valve seat 20. Also, the first port 18a of the pipe 18 and the second port 19a of the pipe 19 are connected to the indoor heat exchanger 4 and the outdoor heat exchanger 6, respectively, and are connected to the valve chamber 12 or the flow path depending on the position of the slide valve 16. It communicates with 21.

The pistons 9 and 1o have pressure balance holes 22. '23 is open.

Next, the structure of the pilot valve device 8 will be explained.

Two valve chambers 24 and 25 are provided within the pilot device 8, each having a communicating hole 29 which is alternately closed by needle valves 27, 28 operated by a solenoid coil 28.

The needle valves 27 and 28 in FIG. 6 show the state in which the solenoid coil is energized, ie, in the heating state.

3o is a thin tube that communicates the communication hole 29 and the suction pipe 17, 31 is a thin tube that communicates the valve chamber 11 and the valve chamber 24, and 32 is a thin tube that communicates the valve chamber 13 and the valve chamber 26.

The operating state of the refrigeration cycle switching valve configured as above will be described below.

Figure 6 shows the state of heating operation, and each valve chamber 11.1
The pressures at 2, 13, and 24.25 are as follows.

The discharge gas from the compressor 1 causes the valve chamber 12 to have a high pressure, and attempts to maintain the valve chamber 11 and the valve chamber 13 at a high pressure through the compression balance holes 22 and 23 provided in the pistons 9 and 10. However, the needle valve 2 in the pilot valve device 8
7 closes the communication hole 29, the valve chamber 13 is connected to the thin tube 32.
．． The valve chamber 26 communicates with the suction pipe 17 via the communication hole 29 and the thin tube 3o, resulting in low pressure. Therefore, a pressure difference is generated between the valve chambers 11 and 13 via the pistons 9 and 1o, and the pistons 9 and 10 and the slide valve 15 are pushed to the right in the drawing to maintain a predetermined heating operation state.

Next, the operation of the switching valve 3 at the start of cooling operation will be explained.

In FIG. 5, the solenoid coil 26 is de-energized, so the needle valves 27 and 28 move to the left in the drawing, the needle valve 2B closes the communication port 29, and the thin tube 30 communicates with the valve chamber 24. It becomes like this. Therefore, the valve chamber 11, which is under high pressure during heating, is replaced by the thin tube 31. Valve chamber 24.
It communicates with the suction pipe 17 through the thin tube 30, and the pressure suddenly becomes low.

Therefore, a pressure difference occurs between the valve chamber 12 and the valve chamber 11 across the piston 9, and this pressure difference pushes the piston 9゜1o and the slide valve 15 to the left in the drawing, and the discharge pipe 16 and the pipe 19 are Port 16a, valve chamber 12. The pipe 18 communicates with the first port 19a through the second port 19a.
8a, the suction pipe 17 through the flow path 21° and the outlet 1
It communicates with the air conditioner and enters the cooling operation state.

Problems to be Solved by the Invention However, in the above configuration, in each state of heating operation and cooling operation, the slide valve 16 is caused to close to the valve seat due to the pressure difference between the high pressure refrigerant pressure in the valve chamber 12 and the low pressure refrigerant pressure in the flow path 21. 1. For example, when switching from heating operation to cooling operation or vice versa, the slide valve 16 is driven by a pilot method that utilizes the difference in pressure between high and low refrigerant gas. . Therefore, a very large number of parts are required, and the structure is complicated, resulting in a complicated assembly process.

Furthermore, capillary tubes 30, 31, 32 . There is also the problem of unstable reliability, such as the possibility that the pressure balance holes 22, 23, the communication hole 29 of the pilot valve 8, etc. may be blocked by foreign objects in the refrigerant circuit, resulting in switching operation. was.

In addition, since the operation of the valve is switched depending on the pressure difference, it cannot operate in a state where there is no pressure difference.Since a certain pressure difference is required, switching cannot be performed unless the air conditioner etc. This has caused a problem of driving loss.

In view of the above problems, the present invention provides a slide valve that has a simplified structure, improved assembly workability, reduced cost, and improved reliability of switching operation.

Means for Solving the Problems In order to solve the above problems, the slide valve of the present invention is provided with a slide pulp that slides in the cylinder in the axial direction to switch the refrigerant circuit, the slide pulp is held by a holder,
A projection is provided at one end of the holder, and the holder is connected to an armature with an oblong hole by a bottle, and the armature and slide pulp are driven by a solenoid coil and a return spring.

Function: With the above-described configuration, the present invention can amplify the driving force of the solenoid coil and the return spring through the armature having an oblong hole and directly transmit it to the slide pulp.
By eliminating the pilot valve, the structure can be significantly simplified, and the reliability of switching operation can be improved.

EXAMPLE Hereinafter, a four-way valve for a refrigeration cycle according to an example of the present invention will be described with reference to the drawings. Since the refrigeration system has the same configuration as the conventional product, the same number will be given and detailed explanation thereof will be omitted.

FIG. 1 is a cross-sectional view of a four-way valve for a refrigeration cycle according to the present invention when no current is applied, and FIG. 2 is a perspective view of the main parts thereof.

Reference numeral 33 denotes a cylinder forming a valve body, and an introduction port 34a of a conduit 34 connected to the discharge side of the compressor 1 is opened on the side surface. 36 is a valve seat having a seat surface 35a formed on the inner wall of the cylinder 33, and is connected to the outlet 36a of the conduit 36 connected to the suction side of the compressor 1, the indoor heat exchanger 6, and the outdoor heat exchanger 4. Port 37a of conduit 37.38 connected to.

38a is open. 39 is the valve seat 36
The slide pulp slides on the seat surface 35a of the valve seat 35 in the axial direction of the cylinder 33 and selectively communicates the outlet port 36a with the outlet port 36a of the valve seat 35 to form a refrigerant flow path. . 40 is the slide pulp 3
9 and has a protrusion 40a at one end,
A bottle 41 is press-fitted into the end of the protrusion 40a. 4
2 has an oval hole 42a at one end thereof, and the bottle 41
is an armature that is engaged with the oval hole 42a and connected to the holder 4°. Reference numeral 43 denotes a welded lid that closes one end of the cylinder 33. 44 is a welded lid that closes the other end of the cylinder 33. 46 is a pipe attached coaxially with the cylinder 33 in the center of the lid 44, and the armature 42 is connected inside this pipe 46.
moves in the direction of its axis. 46 is a fixed iron core that closes the tip of the pipe 45. A return spring 47 is disposed between the fixed iron core 46 and the armature 42 and drives the armature 42 toward the side opposite to the fixed iron core. 48 is a solenoid coil, which is a driving source for attracting and moving the armature 42 to the fixed iron core.

The operation of the refrigerating cycle switching valve constructed as described above will be explained below with reference to FIGS. 1 to 4.

FIG. 1 shows the state when the solenoid coil 48 is not energized, and the armature 42 is biased to the left in the figure by the spring pressure of the return spring 47, and the slide pulp 39 is moved by the holder 4° connected to the armature. It stops at the position where it contacts the lid 43.

As a result, the flow path formed by the slide pulp 39 allows communication between the port 37a and the outlet 36a, and also allows the introduction port 34a and the port 38a to communicate through the inside of the cylinder 33. Therefore, the refrigerant gas in the system is compressor 1 →
Conduit 34 → Introduction hole 34a → Passing hole 38a → Conduit 38 → Outdoor heat exchanger θ → Capillary 5 → Indoor heat exchanger 4 → Conduit 37
→ Conduit 37a → Conduit 36a → Conduit 36 → Compressor 1 The air is circulated to form a predetermined cooling cycle circuit. In this state, the oval hole 42a of the armature 42 is located to the left in the figure of the bottle 41 press-fitted into the holder 4o.

Next, the energized state of the solenoid coil 48 is shown in FIGS. 3 and 4.
As shown in the figure.

First, immediately after the solenoid coil 48 is energized, the suction force of the fixed iron core 46 causes the bottle 41 to come into contact with the left side of the oval hole 42a of the armature 42 (FIG. 3), and this bottle 41 holds the slide pulp 39. It is press-fitted into the holder 40, and when it makes impactful contact with the oblong hole 42a of the armature 42, the driving force of the solenoid coil 48 is amplified and transmitted to the slide pulp 39, and the slide pulp 39 is moved to the fourth position on the right side in the figure. Switch to the position shown in the diagram. At this time, the protrusion 40a of the holder 40 comes into contact with the lid 44, the armature 42 comes into contact with the fixed iron core 46 and stops, and the oval hole 42a of the armature 42 is positioned to the right of the bottle 41 in the figure.

As a result, the flow path formed by the slide pulp 39 allows the passage 38a and the outlet 36a to communicate with each other, and the inlet 34& and the passage 37a also communicate through the inside of the cylinder 33. Therefore, the refrigerant gas in the system is compressor 1 →
Conduit 34 → Introduction hole 34a → Passing hole 37a → Conduit 37 → Indoor heat exchanger 4 → Capillary 5 → Indoor heat exchanger 6 → Conduit 38
→ Conduit 38a → Conduit 36a → Conduit 36 → Compressor 1 The air is circulated to form a predetermined heating cycle circuit.

Next, when the solenoid coil 48 is de-energized, the armature 42 is moved into the oval hole 4 by the spring pressure of the return spring 47.
2a, move to the left in the diagram and remove the holder 40.
The slide pulp 39 is further urged to the left in the figure, and the holder 40 comes into contact with the lid 43 and stops, forming the above-mentioned cooling cycle circuit.

As described above, according to this embodiment, the cylinder 33 having the inlet 34a has the outlet 36a and the outlet 37a.

A slide pulp 39 forming a valve seat 36 having a valve seat 38a and selectively switching between an inlet 34a, an outlet 36a, and ports 37a and 38a is held by a holder 4o, and a protrusion 40a is provided at one end of the holder 4o. At the same time, the pin 41 is press-fitted and fixed and connected to the oblong hole 42a of the armature 42, and the slide pulp 39 is driven once by energizing the solenoid coil 48, so that the solenoid coil 48 and the return spring 47
The armature 42 with an oblong hole 42 & the driving force
The signal can be amplified and directly transmitted to the slide pulp 39 via the pilot valve, and the structure can be greatly simplified by eliminating the need for a pilot valve, and the reliability of the switching operation can be improved.

Effects of the Invention As described above, the present invention includes a cylinder forming a valve body and having an inlet, four conduits connected to the cylinder, and an outlet and two ports formed in the cylinder. a slide pulp that slides on a valve seat in the axial direction of the cylinder to switch a refrigerant circuit constituted by the four conduits;

A holder having a protrusion at one end for holding the slide pulp, an armature having an oval hole connected by a bottle press-fitted into one end of the holder, and a solenoid coil and a return spring for driving the armature. With this configuration, the driving force of the solenoid coil and return spring can be amplified through the armature with an oblong hole and directly transmitted to the slide pulp, and the structure can be significantly simplified by eliminating the pilot valve. At the same time, it is possible to provide a slide valve that has great practical effects, such as improving the reliability of switching operation.

[Brief explanation of the drawing]

Fig. 1 shows the case when the solenoid coil is de-energized (
2 is an exploded perspective view of a main part of an embodiment of the present invention, and FIG. 3 is a main part showing a state immediately after the solenoid coil of the four-way valve for the refrigeration cycle shown in Fig. 1 is energized. The cross-sectional view, Figure 4, shows the state when the solenoid coil in Figure 1 is energized (
FIG. 6 is a sectional view showing a conventional four-way valve for a refrigeration cycle in a cooling state, and FIG. 6 is a sectional view showing the heating state of FIG. 5. 33...Cylinder, 34a...Inlet, 34゜36.37.38...Conduit, 36a...
...Outlet, 37a, 38a...Outlet,
36...No (lube sheet, 39...slide pulp, 40...holder, 40a...
...Protrusion, 41...Bin, 42...
・Amateur, 42a... Oval hole, 48・
... Solenoid Koinope 47 ... Return spring. Name of agent: Patent attorney Toshio Nakao and 1 other person33
- Wrinkles/ri 343,, 3'138--1 child medicine-4 packs U should pulp 5.-)~ child a-mouth 41-m= and 9-42- flax + core 42- -- Oval ga 4. J Otsu 3.5---A\shifi Sheet 3v J7. J3-11 浬管JEee-Sly) ＼ Haruref 1 E - 7; ノ νpe = Tsun・Nūa Yakuyō 4 No ー ー L ・ N 3 ji 36 5 － 1 ＼ 7〉- Mi3D1.2. -5-b port 370.38A-m-port 39- Slat? X-shift□ 4θ--su, wrinkle' ridge toe unraised part 41- this 42- flax+air 42f2--one long day shape 33- ring 3436373s-R1, number of entries-tan entrance 4- SoL Noid Cari 21/ Figure 5

Claims (1)

[Claims] A cylinder forming a valve body and having an inlet, four conduits connected to the cylinder, a valve seat having an outlet and two ports formed in the cylinder, and a valve seat formed on the valve seat. sliding in the axial direction of the cylinder,
a slide valve that switches the refrigerant circuit constituted by the four conduits; a holder that holds the slide valve and has a protrusion at one end; and an oval shape connected to the holder by a pin press-fitted into one end of the holder. A sliding valve comprising: a armature having a hole; a solenoid coil for driving the armature; and a return spring.